fix

.github/workflows/ci.yml

@@ -82,7 +82,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.71.0
+          toolchain: 1.65.0
           components: clippy
           override: true
       - run: sudo apt-get install libpcsclite-dev

CHANGELOG.md

@@ -4,11 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 0.8.0 (2023-08-15)
+## Unreleased
 ### Added
-- `impl Debug for {Context, YubiKey}` ([#457])
-- `YubiKey::disconnect` ([#462])
-- `Error::AppletNotFound` ([#476])
+- `YubiKey::disconnect`
+- `impl Debug for {Context, YubiKey}`
+- `Error::AppletNotFound`
 
 ### Changed
 - `Reader::open` now returns `Error::AppletNotFound` instead of `Error::Generic`
@@ -18,35 +18,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `Reader::open` now avoids resetting the card if an error occurs (equivalent to
   calling `YubiKey::disconnect(pcsc::Disposition::LeaveCard)` if `Reader::open`
   succeeds).
-- Raise minimum `pcsc` version to 2.3.1 and remove workaround ([#478])
-- Bump asymmetric crypto dependencies; MSRV 1.65 ([#490])
-  - `elliptic-curve` v0.13
-  - `k256` v0.13
-  - `p256` v0.13
-  - `p384` v0.13
-  - `pbkdf2` v0.12
-  - `rsa` v0.9 ([#502])
-  - `signature` v2
-- Use `x509-cert` certificate builder ([#495])
-- Make `RsaKeyData::new` fallible ([#517])
 
 ### Fixed
 - `StatusWords::code` now returns the correct code (including embedded `tries`
   count) for `StatusWords::VerifyFailError`. Previously the returned code lost
   information and was not round-trip compatible with `StatusWords::from(u16)`.
-- Parsing of serial numbers ([#466])
-- Make `YubiKey::open()` more robust ([#504])
-
-[#457]: https://github.com/iqlusioninc/yubikey.rs/pull/457
-[#462]: https://github.com/iqlusioninc/yubikey.rs/pull/462
-[#466]: https://github.com/iqlusioninc/yubikey.rs/pull/466
-[#476]: https://github.com/iqlusioninc/yubikey.rs/pull/476
-[#478]: https://github.com/iqlusioninc/yubikey.rs/pull/478
-[#490]: https://github.com/iqlusioninc/yubikey.rs/pull/490
-[#495]: https://github.com/iqlusioninc/yubikey.rs/pull/495
-[#502]: https://github.com/iqlusioninc/yubikey.rs/pull/502
-[#504]: https://github.com/iqlusioninc/yubikey.rs/pull/504
-[#517]: https://github.com/iqlusioninc/yubikey.rs/pull/517
 
 ## 0.7.0 (2022-11-14)
 ### Added

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "yubikey"
-version = "0.8.0"
+version = "0.8.0-pre.0"
 description = """
 Pure Rust cross-platform host-side driver for YubiKey devices from Yubico with
 support for hardware-backed public-key decryption and digital signatures using
@@ -19,11 +19,10 @@ rust-version = "1.65"
 [workspace]
 members = [".", "cli"]
 
-[workspace.dependencies]
-x509-cert = { version = "0.2.3", features = [ "builder", "hazmat" ] }
-
 [dependencies]
-der = "0.7.1"
+chrono = "0.4.23"
+cookie-factory = "0.3"
+der-parser = "8"
 des = "0.8"
 elliptic-curve = "0.13"
 hex = { package = "base16ct", version = "0.2", features = ["alloc"] }
@@ -33,20 +32,19 @@ nom = "7"
 num-bigint-dig = { version = "0.8", features = ["rand"] }
 num-traits = "0.2"
 num-integer = "0.1"
-ecdsa = { version = "0.16.7", features = ["digest", "pem"] }
 p256 = "0.13"
 p384 = "0.13"
 pbkdf2 = { version = "0.12", default-features = false, features = ["hmac"] }
 pcsc = "2.3.1"
 rand_core = { version = "0.6", features = ["std"] }
-rsa = { version = "0.9.2", features = ["sha2"] }
+rsa = "=0.9.0-pre.0"
 secrecy = "0.8"
 sha1 = { version = "0.10", features = ["oid"] }
 sha2 = { version = "0.10", features = ["oid"] }
-signature = "2"
 subtle = "2"
 uuid = { version = "1.2", features = ["v4"] }
-x509-cert.workspace = true
+x509 = "0.2"
+x509-parser = "0.14"
 zeroize = "1"
 
 [dev-dependencies]

cli/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "yubikey-cli"
-version = "0.8.0-pre"
+version = "0.7.0"
 description = """
 Command-line interface for performing encryption and signing using RSA/ECC keys
 stored on YubiKey devices.
@@ -22,5 +22,5 @@ log = "0.4"
 once_cell = "1"
 sha2 = "0.10"
 termcolor = "1"
-x509-cert.workspace = true
-yubikey = { version = "0.8", path = ".." }
+x509-parser = "0.14"
+yubikey = { version = "0.8.0-pre.0", path = ".." }

cli/src/terminal.rs

@@ -9,7 +9,7 @@ use std::{
     sync::Mutex,
 };
 use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, StandardStreamLock, WriteColor};
-use x509_cert::der::Encode;
+use x509_parser::parse_x509_certificate;
 use yubikey::{certificate::Certificate, piv::*, YubiKey};
 
 /// Print a success status message (in green if colors are enabled)
@@ -180,19 +180,22 @@ pub fn print_cert_info(
             return Ok(());
         }
     };
-    let cert = &cert.cert;
+    let buf = cert.into_buffer();
 
-    let fingerprint = Sha256::digest(cert.to_der().unwrap());
+    if !buf.is_empty() {
+        let fingerprint = Sha256::digest(&buf);
         let slot_id: u8 = slot.into();
         print_cert_attr(stream, "Slot", format!("{:x}", slot_id))?;
+        match parse_x509_certificate(&buf) {
+            Ok((_rem, cert)) => {
                 print_cert_attr(
                     stream,
                     "Algorithm",
-        cert.tbs_certificate.subject_public_key_info.algorithm.oid,
+                    cert.tbs_certificate.subject_pki.algorithm.algorithm,
                 )?;
 
-    print_cert_attr(stream, "Subject", &cert.tbs_certificate.subject)?;
-    print_cert_attr(stream, "Issuer", &cert.tbs_certificate.issuer)?;
+                print_cert_attr(stream, "Subject", cert.tbs_certificate.subject)?;
+                print_cert_attr(stream, "Issuer", cert.tbs_certificate.issuer)?;
                 print_cert_attr(
                     stream,
                     "Fingerprint",
@@ -201,9 +204,28 @@ pub fn print_cert_info(
                 print_cert_attr(
                     stream,
                     "Not Before",
-        cert.tbs_certificate.validity.not_before,
+                    cert.tbs_certificate
+                        .validity
+                        .not_before
+                        .to_rfc2822()
+                        .unwrap(),
                 )?;
-    print_cert_attr(stream, "Not After", cert.tbs_certificate.validity.not_after)?;
+                print_cert_attr(
+                    stream,
+                    "Not After",
+                    cert.tbs_certificate
+                        .validity
+                        .not_after
+                        .to_rfc2822()
+                        .unwrap(),
+                )?;
+            }
+            _ => {
+                println!("Failed to parse certificate");
+                return Ok(());
+            }
+        };
+    }
 
     Ok(())
 }

src/cccid.rs

@@ -30,7 +30,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-use crate::{Result, YubiKey};
+use crate::{Error, Result, YubiKey};
 use rand_core::{OsRng, RngCore};
 use std::fmt::{self, Debug, Display};
 
@@ -48,7 +48,6 @@ const OBJ_CAPABILITY: u32 = 0x005f_c107;
 ///  - 0xff == Manufacturer ID (dummy)
 ///  - 0x02 == Card type (javaCard)
 ///  - next 14 bytes: card ID
-#[allow(dead_code)]
 const CCC_TMPL: &[u8] = &[
     0xf0, 0x15, 0xa0, 0x00, 0x00, 0x01, 0x16, 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf1, 0x01, 0x21, 0xf2, 0x01, 0x21, 0xf3, 0x00, 0xf4,
@@ -91,11 +90,17 @@ impl CccId {
     pub fn get(yubikey: &mut YubiKey) -> Result<Self> {
         let txn = yubikey.begin_transaction()?;
         let response = txn.fetch_object(OBJ_CAPABILITY)?;
-        Ok(response[..Self::BYTE_SIZE].try_into().map(Self)?)
+
+        if response.len() != CCC_TMPL.len() {
+            return Err(Error::GenericError);
+        }
+
+        Ok(Self(response[..Self::BYTE_SIZE].try_into().unwrap()))
     }
 
     /// Set Cardholder Capability Container (CCC) ID
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn set(&self, yubikey: &mut YubiKey) -> Result<()> {
         let mut buf = CCC_TMPL.to_vec();
         buf[0..self.0.len()].copy_from_slice(&self.0);

src/certificate.rs

@@ -33,27 +33,90 @@
 use crate::{
     consts::CB_OBJ_MAX,
     error::{Error, Result},
-    piv::SlotId,
+    piv::{sign_data, AlgorithmId, SlotId},
     serialization::*,
     transaction::Transaction,
     yubikey::YubiKey,
     Buffer,
 };
+use chrono::{DateTime, Utc};
+use elliptic_curve::sec1::EncodedPoint as EcPublicKey;
 use log::error;
-use x509_cert::{
-    builder::{Builder, CertificateBuilder, Profile},
-    der::{self, referenced::OwnedToRef, Decode, Encode},
-    name::Name,
-    serial_number::SerialNumber,
-    spki::{SubjectPublicKeyInfoOwned, SubjectPublicKeyInfoRef},
-    time::Validity,
-};
+use num_bigint_dig::BigUint;
+use p256::NistP256;
+use p384::NistP384;
+use rsa::{PublicKeyParts, RsaPublicKey};
+use sha2::{Digest, Sha256};
+use std::fmt::Display;
+use std::{fmt, ops::DerefMut};
+use x509::{der::Oid, RelativeDistinguishedName};
+use x509_parser::{parse_x509_certificate, x509::SubjectPublicKeyInfo};
 use zeroize::Zeroizing;
 
+// TODO: Make these der_parser::oid::Oid constants when it has const fn support.
+const OID_RSA_ENCRYPTION: &str = "1.2.840.113549.1.1.1";
+const OID_EC_PUBLIC_KEY: &str = "1.2.840.10045.2.1";
+const OID_NIST_P256: &str = "1.2.840.10045.3.1.7";
+const OID_NIST_P384: &str = "1.3.132.0.34";
+
 const TAG_CERT: u8 = 0x70;
 const TAG_CERT_COMPRESS: u8 = 0x71;
 const TAG_CERT_LRC: u8 = 0xFE;
 
+/// A serial number for a [`Certificate`].
+#[derive(Clone, Debug)]
+pub struct Serial(BigUint);
+
+impl From<BigUint> for Serial {
+    fn from(num: BigUint) -> Serial {
+        Serial(num)
+    }
+}
+
+impl From<[u8; 20]> for Serial {
+    fn from(bytes: [u8; 20]) -> Serial {
+        Serial(BigUint::from_bytes_be(&bytes))
+    }
+}
+
+impl TryFrom<&[u8]> for Serial {
+    type Error = Error;
+
+    fn try_from(bytes: &[u8]) -> Result<Serial> {
+        if bytes.len() <= 20 {
+            Ok(Serial(BigUint::from_bytes_be(bytes)))
+        } else {
+            Err(Error::ParseError)
+        }
+    }
+}
+
+impl Serial {
+    fn to_bytes(&self) -> Vec<u8> {
+        self.0.to_bytes_be()
+    }
+    /// Returns itself formatted as x509 compatible hex string
+    pub fn as_x509_hex(&self) -> String {
+        let data = self.to_bytes();
+        let raw_hex_string = format!("{:02X?}", data);
+        raw_hex_string
+            .replace(", ", ":")
+            .replace([']', '['], "")
+            .to_lowercase()
+    }
+    /// Returns itself formatted as x509 compatible int string
+    pub fn as_x509_int(&self) -> String {
+        let Serial(buint) = self;
+        format!("{}", buint)
+    }
+}
+
+impl Display for Serial {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.as_x509_hex())
+    }
+}
+
 /// Information about how a [`Certificate`] is stored within a YubiKey.
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum CertInfo {
@@ -85,11 +148,210 @@ impl From<CertInfo> for u8 {
     }
 }
 
+impl x509::AlgorithmIdentifier for AlgorithmId {
+    type AlgorithmOid = &'static [u64];
+
+    fn algorithm(&self) -> Self::AlgorithmOid {
+        match self {
+            // RSA encryption
+            AlgorithmId::Rsa1024 | AlgorithmId::Rsa2048 => &[1, 2, 840, 113_549, 1, 1, 1],
+            // EC Public Key
+            AlgorithmId::EccP256 | AlgorithmId::EccP384 => &[1, 2, 840, 10045, 2, 1],
+        }
+    }
+
+    fn parameters<W: std::io::Write>(
+        &self,
+        w: cookie_factory::WriteContext<W>,
+    ) -> cookie_factory::GenResult<W> {
+        use x509::der::write::der_oid;
+
+        // From [RFC 5480](https://tools.ietf.org/html/rfc5480#section-2.1.1):
+        // ```text
+        // ECParameters ::= CHOICE {
+        //   namedCurve         OBJECT IDENTIFIER
+        //   -- implicitCurve   NULL
+        //   -- specifiedCurve  SpecifiedECDomain
+        // }
+        // ```
+        match self {
+            AlgorithmId::EccP256 => der_oid(&[1, 2, 840, 10045, 3, 1, 7][..])(w),
+            AlgorithmId::EccP384 => der_oid(&[1, 3, 132, 0, 34][..])(w),
+            _ => Ok(w),
+        }
+    }
+}
+
+/// Information about a public key within a [`Certificate`].
+#[derive(Clone, Eq, PartialEq)]
+pub enum PublicKeyInfo {
+    /// RSA keys
+    Rsa {
+        /// RSA algorithm
+        algorithm: AlgorithmId,
+
+        /// Public key
+        pubkey: RsaPublicKey,
+    },
+
+    /// EC P-256 keys
+    EcP256(EcPublicKey<NistP256>),
+
+    /// EC P-384 keys
+    EcP384(EcPublicKey<NistP384>),
+}
+
+impl fmt::Debug for PublicKeyInfo {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "PublicKeyInfo({:?})", self.algorithm())
+    }
+}
+
+impl PublicKeyInfo {
+    fn parse(subject_pki: &SubjectPublicKeyInfo<'_>) -> Result<Self> {
+        match subject_pki.algorithm.algorithm.to_string().as_str() {
+            OID_RSA_ENCRYPTION => {
+                let pubkey = read_pki::rsa_pubkey(&subject_pki.subject_public_key.data)?;
+
+                Ok(PublicKeyInfo::Rsa {
+                    algorithm: match pubkey.n().bits() {
+                        1024 => AlgorithmId::Rsa1024,
+                        2048 => AlgorithmId::Rsa2048,
+                        _ => return Err(Error::AlgorithmError),
+                    },
+                    pubkey,
+                })
+            }
+            OID_EC_PUBLIC_KEY => {
+                let key_bytes = &subject_pki.subject_public_key.data;
+                let algorithm_parameters = subject_pki
+                    .algorithm
+                    .parameters
+                    .as_ref()
+                    .ok_or(Error::InvalidObject)?;
+
+                match read_pki::ec_parameters(algorithm_parameters)? {
+                    AlgorithmId::EccP256 => EcPublicKey::<NistP256>::from_bytes(key_bytes)
+                        .map(PublicKeyInfo::EcP256)
+                        .map_err(|_| Error::InvalidObject),
+                    AlgorithmId::EccP384 => EcPublicKey::<NistP384>::from_bytes(key_bytes)
+                        .map(PublicKeyInfo::EcP384)
+                        .map_err(|_| Error::InvalidObject),
+                    _ => Err(Error::AlgorithmError),
+                }
+            }
+            _ => Err(Error::InvalidObject),
+        }
+    }
+
+    /// Returns the algorithm that this public key can be used with.
+    pub fn algorithm(&self) -> AlgorithmId {
+        match self {
+            PublicKeyInfo::Rsa { algorithm, .. } => *algorithm,
+            PublicKeyInfo::EcP256(_) => AlgorithmId::EccP256,
+            PublicKeyInfo::EcP384(_) => AlgorithmId::EccP384,
+        }
+    }
+}
+
+impl x509::SubjectPublicKeyInfo for PublicKeyInfo {
+    type AlgorithmId = AlgorithmId;
+    type SubjectPublicKey = Vec<u8>;
+
+    fn algorithm_id(&self) -> AlgorithmId {
+        self.algorithm()
+    }
+
+    fn public_key(&self) -> Vec<u8> {
+        match self {
+            PublicKeyInfo::Rsa { pubkey, .. } => {
+                cookie_factory::gen_simple(write_pki::rsa_pubkey(pubkey), vec![])
+                    .expect("can write to Vec")
+            }
+            PublicKeyInfo::EcP256(pubkey) => pubkey.as_bytes().to_vec(),
+            PublicKeyInfo::EcP384(pubkey) => pubkey.as_bytes().to_vec(),
+        }
+    }
+}
+
+/// Digest algorithms.
+///
+/// See RFC 4055 and RFC 8017.
+enum DigestId {
+    /// Secure Hash Algorithm 256 (SHA256)
+    Sha256,
+}
+
+impl x509::AlgorithmIdentifier for DigestId {
+    type AlgorithmOid = &'static [u64];
+
+    fn algorithm(&self) -> Self::AlgorithmOid {
+        match self {
+            // See https://tools.ietf.org/html/rfc4055#section-2.1
+            DigestId::Sha256 => &[2, 16, 840, 1, 101, 3, 4, 2, 1],
+        }
+    }
+
+    fn parameters<W: std::io::Write>(
+        &self,
+        w: cookie_factory::WriteContext<W>,
+    ) -> cookie_factory::GenResult<W> {
+        // Parameters are an explicit NULL
+        // See https://tools.ietf.org/html/rfc8017#appendix-A.2.4
+        x509::der::write::der_null()(w)
+    }
+}
+
+enum SignatureId {
+    /// Public-Key Cryptography Standards (PKCS) #1 version 1.5 signature algorithm with
+    /// Secure Hash Algorithm 256 (SHA256) and Rivest, Shamir and Adleman (RSA) encryption
+    ///
+    /// See RFC 4055 and RFC 8017.
+    Sha256WithRsaEncryption,
+
+    /// Elliptic Curve Digital Signature Algorithm (DSA) coupled with the Secure Hash
+    /// Algorithm 256 (SHA256) algorithm
+    ///
+    /// See RFC 5758.
+    EcdsaWithSha256,
+}
+
+impl x509::AlgorithmIdentifier for SignatureId {
+    type AlgorithmOid = &'static [u64];
+
+    fn algorithm(&self) -> Self::AlgorithmOid {
+        match self {
+            SignatureId::Sha256WithRsaEncryption => &[1, 2, 840, 113_549, 1, 1, 11],
+            SignatureId::EcdsaWithSha256 => &[1, 2, 840, 10045, 4, 3, 2],
+        }
+    }
+
+    fn parameters<W: std::io::Write>(
+        &self,
+        w: cookie_factory::WriteContext<W>,
+    ) -> cookie_factory::GenResult<W> {
+        // No parameters for any SignatureId
+        Ok(w)
+    }
+}
+
 /// Certificates
 #[derive(Clone, Debug)]
 pub struct Certificate {
-    /// Inner certificate
-    pub cert: x509_cert::Certificate,
+    serial: Serial,
+    #[allow(dead_code)]
+    issuer: String,
+    subject: String,
+    subject_pki: PublicKeyInfo,
+    data: Buffer,
+}
+
+impl<'a> TryFrom<&'a [u8]> for Certificate {
+    type Error = Error;
+
+    fn try_from(bytes: &'a [u8]) -> Result<Self> {
+        Self::from_bytes(bytes.to_vec())
+    }
 }
 
 impl Certificate {
@@ -98,35 +360,112 @@ impl Certificate {
     ///
     /// `extensions` is optional; if empty, no extensions will be included. Due to the
     /// need for an `O: Oid` type parameter, users who do not have any extensions should
-    /// use the workaround `let extensions: &[x509_cert::Extension<'_, &[u64]>] = &[];`.
-    pub fn generate_self_signed<F, KT: yubikey_signer::KeyType>(
+    /// use the workaround `let extensions: &[x509::Extension<'_, &[u64]>] = &[];`.
+    pub fn generate_self_signed<O: Oid>(
         yubikey: &mut YubiKey,
         key: SlotId,
-        serial: SerialNumber,
-        validity: Validity,
-        subject: Name,
-        subject_pki: SubjectPublicKeyInfoOwned,
-        extensions: F,
-    ) -> Result<Self>
-    where
-        F: FnOnce(&mut CertificateBuilder<'_, yubikey_signer::Signer<'_, KT>>) -> der::Result<()>,
-    {
-        let signer = yubikey_signer::Signer::new(yubikey, key, subject_pki.owned_to_ref())?;
-        let mut builder = CertificateBuilder::new(
-            Profile::Manual { issuer: None },
+        serial: impl Into<Serial>,
+        not_after: Option<DateTime<Utc>>,
+        subject: &[RelativeDistinguishedName<'_>],
+        subject_pki: PublicKeyInfo,
+        extensions: &[x509::Extension<'_, O>],
+    ) -> Result<Self> {
+        let serial = serial.into();
+
+        let mut tbs_cert = Buffer::new(Vec::with_capacity(CB_OBJ_MAX));
+
+        let signature_algorithm = match subject_pki.algorithm() {
+            AlgorithmId::Rsa1024 | AlgorithmId::Rsa2048 => SignatureId::Sha256WithRsaEncryption,
+            AlgorithmId::EccP256 | AlgorithmId::EccP384 => SignatureId::EcdsaWithSha256,
+        };
+
+        cookie_factory::gen(
+            x509::write::tbs_certificate(
+                &serial.to_bytes(),
+                &signature_algorithm,
+                // Issuer and subject are the same in self-signed certificates.
+                subject,
+                Utc::now(),
+                not_after,
+                subject,
+                &subject_pki,
+                extensions,
+            ),
+            tbs_cert.deref_mut(),
+        )
+        .expect("can serialize to Vec");
+
+        let signature = match signature_algorithm {
+            SignatureId::Sha256WithRsaEncryption => {
+                use cookie_factory::{combinator::slice, sequence::tuple};
+                use x509::{
+                    der::write::{der_octet_string, der_sequence},
+                    write::algorithm_identifier,
+                };
+
+                let em_len = if let AlgorithmId::Rsa1024 = subject_pki.algorithm() {
+                    128
+                } else {
+                    256
+                };
+
+                let h = Sha256::digest(&tbs_cert);
+
+                let t = cookie_factory::gen_simple(
+                    der_sequence((
+                        algorithm_identifier(&DigestId::Sha256),
+                        der_octet_string(&h),
+                    )),
+                    vec![],
+                )
+                .expect("can serialize into Vec");
+
+                let em = cookie_factory::gen_simple(
+                    tuple((
+                        slice(&[0x00, 0x01]),
+                        slice(&vec![0xff; em_len - t.len() - 3]),
+                        slice(&[0x00]),
+                        slice(t),
+                    )),
+                    vec![],
+                )
+                .expect("can serialize to Vec");
+
+                sign_data(yubikey, &em, subject_pki.algorithm(), key)
+            }
+            SignatureId::EcdsaWithSha256 => sign_data(
+                yubikey,
+                &Sha256::digest(&tbs_cert),
+                subject_pki.algorithm(),
+                key,
+            ),
+        }?;
+
+        let mut data = Buffer::new(Vec::with_capacity(CB_OBJ_MAX));
+
+        cookie_factory::gen(
+            x509::write::certificate(&tbs_cert, &signature_algorithm, &signature),
+            data.deref_mut(),
+        )
+        .expect("can serialize to Vec");
+
+        let (issuer, subject) = parse_x509_certificate(&data)
+            .map(|(_, cert)| {
+                (
+                    cert.tbs_certificate.issuer.to_string(),
+                    cert.tbs_certificate.subject.to_string(),
+                )
+            })
+            .expect("We just serialized this correctly");
+
+        let cert = Certificate {
             serial,
-            validity,
+            issuer,
             subject,
             subject_pki,
-            &signer,
-        )
-        .map_err(|_| Error::KeyError)?;
+            data,
+        };
 
-        // Add custom extensions
-        extensions(&mut builder)?;
-
-        let cert = builder.build().map_err(|_| Error::KeyError)?;
-        let cert = Self { cert };
         cert.write(yubikey, key, CertInfo::Uncompressed)?;
 
         Ok(cert)
@@ -141,18 +480,18 @@ impl Certificate {
             return Err(Error::InvalidObject);
         }
 
-        Self::from_bytes(buf)
+        Certificate::from_bytes(buf)
     }
 
     /// Write this certificate into the YubiKey in the given slot
     pub fn write(&self, yubikey: &mut YubiKey, slot: SlotId, certinfo: CertInfo) -> Result<()> {
         let txn = yubikey.begin_transaction()?;
-        let data = self.cert.to_der().map_err(|_| Error::InvalidObject)?;
-        write_certificate(&txn, slot, Some(&data), certinfo)
+        write_certificate(&txn, slot, Some(&self.data), certinfo)
     }
 
     /// Delete a certificate located at the given slot of the given YubiKey
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn delete(yubikey: &mut YubiKey, slot: SlotId) -> Result<()> {
         let txn = yubikey.begin_transaction()?;
         write_certificate(&txn, slot, None, CertInfo::Uncompressed)
@@ -167,27 +506,55 @@ impl Certificate {
             return Err(Error::SizeError);
         }
 
-        x509_cert::Certificate::from_der(&cert)
-            .map(|cert| Self { cert })
-            .map_err(|_| Error::InvalidObject)
+        let parsed_cert = match parse_x509_certificate(&cert) {
+            Ok((_, cert)) => cert,
+            _ => return Err(Error::InvalidObject),
+        };
+
+        let serial = Serial::try_from(parsed_cert.tbs_certificate.serial.to_bytes_be().as_slice())
+            .map_err(|_| Error::InvalidObject)?;
+        let issuer = parsed_cert.tbs_certificate.issuer.to_string();
+        let subject = parsed_cert.tbs_certificate.subject.to_string();
+        let subject_pki = PublicKeyInfo::parse(&parsed_cert.tbs_certificate.subject_pki)?;
+
+        Ok(Certificate {
+            serial,
+            issuer,
+            subject,
+            subject_pki,
+            data: cert,
+        })
+    }
+
+    /// Returns the serial number of the certificate.
+    pub fn serial(&self) -> &Serial {
+        &self.serial
     }
 
     /// Returns the Issuer field of the certificate.
-    pub fn issuer(&self) -> String {
-        self.cert.tbs_certificate.issuer.to_string()
+    pub fn issuer(&self) -> &str {
+        &self.issuer
     }
 
     /// Returns the SubjectName field of the certificate.
-    pub fn subject(&self) -> String {
-        self.cert.tbs_certificate.subject.to_string()
+    pub fn subject(&self) -> &str {
+        &self.subject
     }
 
     /// Returns the SubjectPublicKeyInfo field of the certificate.
-    pub fn subject_pki(&self) -> SubjectPublicKeyInfoRef<'_> {
-        self.cert
-            .tbs_certificate
-            .subject_public_key_info
-            .owned_to_ref()
+    pub fn subject_pki(&self) -> &PublicKeyInfo {
+        &self.subject_pki
+    }
+
+    /// Extract the inner buffer
+    pub fn into_buffer(self) -> Buffer {
+        self.data
+    }
+}
+
+impl AsRef<[u8]> for Certificate {
+    fn as_ref(&self) -> &[u8] {
+        self.data.as_ref()
     }
 }
 
@@ -223,7 +590,12 @@ pub(crate) fn write_certificate(
 ) -> Result<()> {
     let object_id = slot.object_id();
 
-    if let Some(data) = data {
+    if data.is_none() {
+        return txn.save_object(object_id, &[]);
+    }
+
+    let data = data.unwrap();
+
     let mut buf = [0u8; CB_OBJ_MAX];
     let mut offset = Tlv::write(&mut buf, TAG_CERT, data)?;
 
@@ -232,228 +604,99 @@ pub(crate) fn write_certificate(
     offset += Tlv::write(&mut buf[offset..], TAG_CERT_LRC, &[])?;
 
     txn.save_object(object_id, &buf[..offset])
-    } else {
-        txn.save_object(object_id, &[])
-    }
 }
 
-pub mod yubikey_signer {
-    //! Signer implementation for yubikey
+mod read_pki {
+    use der_parser::{
+        asn1_rs::Any,
+        ber::BerObjectContent,
+        der::{parse_der_integer, parse_der_sequence_defined_g, DerObject},
+        error::BerError,
+    };
+    use nom::{combinator, sequence::pair, IResult};
+    use rsa::{BigUint, RsaPublicKey};
 
-    use crate::{
-        error::{Error, Result},
-        piv::AlgorithmId,
-        piv::{sign_data, SlotId},
-        YubiKey,
+    use super::{OID_NIST_P256, OID_NIST_P384};
+    use crate::{piv::AlgorithmId, Error, Result};
+
+    /// From [RFC 8017](https://tools.ietf.org/html/rfc8017#appendix-A.1.1):
+    /// ```text
+    /// RSAPublicKey ::= SEQUENCE {
+    ///     modulus           INTEGER,  -- n
+    ///     publicExponent    INTEGER   -- e
+    /// }
+    /// ```
+    pub(super) fn rsa_pubkey(encoded: &[u8]) -> Result<RsaPublicKey> {
+        fn parse_rsa_pubkey(i: &[u8]) -> IResult<&[u8], (DerObject<'_>, DerObject<'_>), BerError> {
+            parse_der_sequence_defined_g(|i, _| pair(parse_der_integer, parse_der_integer)(i))(i)
+        }
+
+        fn rsa_pubkey_parts(i: &[u8]) -> IResult<&[u8], (BigUint, BigUint), BerError> {
+            combinator::map(parse_rsa_pubkey, |(modulus, public_exponent)| {
+                let n = match modulus.content {
+                    BerObjectContent::Integer(s) => BigUint::from_bytes_be(s),
+                    _ => panic!("expected DER integer"),
                 };
-    use der::{
-        asn1::{Any, OctetString},
-        oid::db::rfc5912,
-        Encode, Sequence,
-    };
-    use sha2::{Digest, Sha256, Sha384};
-    use signature::Keypair;
-    use std::{cell::RefCell, fmt, io::Write, marker::PhantomData};
-    use x509_cert::spki::{
-        self, AlgorithmIdentifierOwned, DynSignatureAlgorithmIdentifier, EncodePublicKey,
-        SignatureBitStringEncoding, SubjectPublicKeyInfoRef,
+                let e = match public_exponent.content {
+                    BerObjectContent::Integer(s) => BigUint::from_bytes_be(s),
+                    _ => panic!("expected DER integer"),
                 };
 
-    type SigResult<T> = core::result::Result<T, signature::Error>;
-
-    /// Key to be used to sign certificates
-    pub trait KeyType {
-        /// Error returned when working with signature
-        type Error: Into<signature::Error> + fmt::Debug;
-        /// The signature type returned by the signer
-        type Signature: SignatureBitStringEncoding
-            + for<'s> TryFrom<&'s [u8], Error = Self::Error>
-            + fmt::Debug;
-        /// The public key used to verify signature
-        type VerifyingKey: EncodePublicKey
-            + DynSignatureAlgorithmIdentifier
-            + Clone
-            + From<Self::PublicKey>;
-        /// Public key type used to load the SPKI formatted key
-        type PublicKey: for<'a> TryFrom<SubjectPublicKeyInfoRef<'a>, Error = spki::Error>;
-
-        /// The algorithm used when talking with the yubikey
-        const ALGORITHM: AlgorithmId;
-
-        /// Prepare buffer before submitting it for signature
-        fn prepare(input: &[u8]) -> SigResult<Vec<u8>>;
-        /// Read back the signature from the device
-        fn read_signature(input: &[u8]) -> SigResult<Self::Signature>;
+                (n, e)
+            })(i)
         }
 
-    impl KeyType for p256::NistP256 {
-        const ALGORITHM: AlgorithmId = AlgorithmId::EccP256;
-        type Error = ecdsa::Error;
-        type Signature = p256::ecdsa::DerSignature;
-        type VerifyingKey = p256::ecdsa::VerifyingKey;
-        type PublicKey = p256::ecdsa::VerifyingKey;
-
-        fn prepare(input: &[u8]) -> SigResult<Vec<u8>> {
-            Ok(Sha256::digest(input).to_vec())
-        }
-
-        fn read_signature(input: &[u8]) -> SigResult<Self::Signature> {
-            Self::Signature::from_bytes(input)
-        }
-    }
-
-    impl KeyType for p384::NistP384 {
-        const ALGORITHM: AlgorithmId = AlgorithmId::EccP384;
-        type Error = ecdsa::Error;
-        type Signature = p384::ecdsa::DerSignature;
-        type VerifyingKey = p384::ecdsa::VerifyingKey;
-        type PublicKey = p384::ecdsa::VerifyingKey;
-
-        fn prepare(input: &[u8]) -> SigResult<Vec<u8>> {
-            Ok(Sha384::digest(input).to_vec())
-        }
-
-        fn read_signature(input: &[u8]) -> SigResult<Self::Signature> {
-            Self::Signature::from_bytes(input)
-        }
-    }
-
-    /// Trait used to handle subtypes of RSA keys
-    pub trait RsaLength {
-        /// The length of the RSA key in bits
-        const BIT_LENGTH: usize;
-        /// The algorithm to use when talking with the Yubikey.
-        const ALGORITHM: AlgorithmId;
-    }
-
-    /// RSA 1024 bits key
-    pub struct Rsa1024;
-
-    impl RsaLength for Rsa1024 {
-        const BIT_LENGTH: usize = 1024;
-        const ALGORITHM: AlgorithmId = AlgorithmId::Rsa1024;
-    }
-
-    /// RSA 2048 bits key
-    pub struct Rsa2048;
-
-    impl RsaLength for Rsa2048 {
-        const BIT_LENGTH: usize = 2048;
-        const ALGORITHM: AlgorithmId = AlgorithmId::Rsa2048;
-    }
-
-    /// RSA keys used to sign certificates
-    pub struct YubiRsa<N: RsaLength> {
-        _len: PhantomData<N>,
-    }
-
-    impl<N: RsaLength> KeyType for YubiRsa<N> {
-        type Error = signature::Error;
-        type Signature = rsa::pkcs1v15::Signature;
-        type VerifyingKey = rsa::pkcs1v15::VerifyingKey<Sha256>;
-        type PublicKey = rsa::RsaPublicKey;
-        const ALGORITHM: AlgorithmId = N::ALGORITHM;
-
-        fn prepare(input: &[u8]) -> SigResult<Vec<u8>> {
-            let hashed = Sha256::digest(input).to_vec();
-
-            OctetString::new(hashed)
-                .map_err(|e| e.into())
-                .and_then(Self::emsa_pkcs1_1_5)
-                .map_err(signature::Error::from_source)
-        }
-
-        fn read_signature(input: &[u8]) -> SigResult<Self::Signature> {
-            Self::Signature::try_from(input)
-        }
-    }
-
-    impl<N: RsaLength> YubiRsa<N> {
-        /// https://www.rfc-editor.org/rfc/rfc8017#section-9.2
-        fn emsa_pkcs1_1_5(digest: OctetString) -> Result<Vec<u8>> {
-            /// https://www.rfc-editor.org/rfc/rfc8017#appendix-A.2.4
-            #[derive(Debug, Sequence)]
-            struct DigestInfo {
-                digest_algorithm: AlgorithmIdentifierOwned,
-                digest: OctetString,
-            }
-
-            let em_len = N::BIT_LENGTH / 8;
-
-            let null = Any::null();
-
-            let t = DigestInfo {
-                digest_algorithm: AlgorithmIdentifierOwned {
-                    oid: rfc5912::ID_SHA_256,
-                    parameters: Some(null),
-                },
-                digest,
+        let (n, e) = match rsa_pubkey_parts(encoded) {
+            Ok((_, res)) => res,
+            _ => return Err(Error::InvalidObject),
         };
-            let t = t.to_der()?;
 
-            let ps = vec![0xff; em_len - t.len() - 3];
-            assert!(ps.len() >= 8, "spec violation");
+        RsaPublicKey::new(n, e).map_err(|_| Error::InvalidObject)
+    }
 
-            let mut out = Vec::with_capacity(em_len);
-            out.write(&[0x00, 0x01]).map_err(|_| Error::MemoryError)?;
-            out.write(&ps).map_err(|_| Error::MemoryError)?;
-            out.write(&[0x00]).map_err(|_| Error::MemoryError)?;
-            out.write(&t).map_err(|_| Error::MemoryError)?;
-            Ok(out)
+    /// From [RFC 5480](https://tools.ietf.org/html/rfc5480#section-2.1.1):
+    /// ```text
+    /// ECParameters ::= CHOICE {
+    ///   namedCurve         OBJECT IDENTIFIER
+    ///   -- implicitCurve   NULL
+    ///   -- specifiedCurve  SpecifiedECDomain
+    /// }
+    /// ```
+    pub(super) fn ec_parameters(parameters: &Any<'_>) -> Result<AlgorithmId> {
+        let curve_oid = parameters.as_oid().map_err(|_| Error::InvalidObject)?;
+
+        match curve_oid.to_string().as_str() {
+            OID_NIST_P256 => Ok(AlgorithmId::EccP256),
+            OID_NIST_P384 => Ok(AlgorithmId::EccP384),
+            _ => Err(Error::AlgorithmError),
+        }
     }
 }
 
-    /// The entrypoint to sign data with the yubikey.
-    pub struct Signer<'y, KT: KeyType> {
-        yubikey: RefCell<&'y mut YubiKey>,
-        key: SlotId,
-        public_key: KT::VerifyingKey,
+mod write_pki {
+    use cookie_factory::{SerializeFn, WriteContext};
+    use rsa::{BigUint, PublicKeyParts, RsaPublicKey};
+    use std::io::Write;
+    use x509::der::write::{der_integer, der_sequence};
+
+    /// Encodes a usize as an ASN.1 integer using DER.
+    fn der_integer_biguint<'a, W: Write + 'a>(num: &'a BigUint) -> impl SerializeFn<W> + 'a {
+        move |w: WriteContext<W>| der_integer(&num.to_bytes_be())(w)
     }
 
-    impl<'y, KT: KeyType> Signer<'y, KT> {
-        /// Create new Signer
-        pub fn new(
-            yubikey: &'y mut YubiKey,
-            key: SlotId,
-            subject_pki: SubjectPublicKeyInfoRef<'_>,
-        ) -> Result<Self> {
-            let public_key = KT::PublicKey::try_from(subject_pki).map_err(|_| Error::ParseError)?;
-            let public_key = public_key.into();
-
-            Ok(Self {
-                yubikey: RefCell::new(yubikey),
-                key,
-                public_key,
-            })
-        }
-    }
-
-    impl<'y, KT: KeyType> Keypair for Signer<'y, KT> {
-        type VerifyingKey = KT::VerifyingKey;
-        fn verifying_key(&self) -> <Self as Keypair>::VerifyingKey {
-            self.public_key.clone()
-        }
-    }
-
-    impl<'y, KT: KeyType> DynSignatureAlgorithmIdentifier for Signer<'y, KT> {
-        fn signature_algorithm_identifier(&self) -> spki::Result<AlgorithmIdentifierOwned> {
-            self.verifying_key().signature_algorithm_identifier()
-        }
-    }
-
-    impl<'y, KT: KeyType> signature::Signer<KT::Signature> for Signer<'y, KT> {
-        fn try_sign(&self, msg: &[u8]) -> SigResult<KT::Signature> {
-            let data = KT::prepare(msg)?;
-
-            let out = sign_data(
-                &mut self.yubikey.borrow_mut(),
-                &data,
-                KT::ALGORITHM,
-                self.key,
-            )
-            .map_err(signature::Error::from_source)?;
-            let out = KT::read_signature(&out)?;
-            Ok(out)
-        }
+    /// From [RFC 8017](https://tools.ietf.org/html/rfc8017#appendix-A.1.1):
+    /// ```text
+    /// RSAPublicKey ::= SEQUENCE {
+    ///     modulus           INTEGER,  -- n
+    ///     publicExponent    INTEGER   -- e
+    /// }
+    /// ```
+    pub(super) fn rsa_pubkey<'a, W: Write + 'a>(
+        pubkey: &'a RsaPublicKey,
+    ) -> impl SerializeFn<W> + 'a {
+        der_sequence((
+            der_integer_biguint(pubkey.n()),
+            der_integer_biguint(pubkey.e()),
+        ))
     }
 }

src/chuid.rs

@@ -30,7 +30,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-use crate::{Result, YubiKey};
+use crate::{Error, Result, YubiKey};
 use std::fmt::{self, Debug, Display};
 use uuid::Uuid;
 
@@ -61,7 +61,6 @@ const OBJ_CHUID: u32 = 0x005f_c102;
 /// - 0x35: Exp. Date (hard-coded)
 /// - 0x3e: Signature (hard-coded, empty)
 /// - 0xfe: Error Detection Code (hard-coded)
-#[allow(dead_code)]
 const CHUID_TMPL: &[u8] = &[
     0x30, 0x19, 0xd4, 0xe7, 0x39, 0xda, 0x73, 0x9c, 0xed, 0x39, 0xce, 0x73, 0x9d, 0x83, 0x68, 0x58,
     0x21, 0x08, 0x42, 0x10, 0x84, 0x21, 0xc8, 0x42, 0x10, 0xc3, 0xeb, 0x34, 0x10, 0x00, 0x00, 0x00,
@@ -87,13 +86,12 @@ impl ChuId {
     pub fn fascn(&self) -> [u8; Self::FASCN_SIZE] {
         self.0[CHUID_FASCN_OFFS..(CHUID_FASCN_OFFS + Self::FASCN_SIZE)]
             .try_into()
-            .expect("should be FASCN_SIZE")
+            .unwrap()
     }
 
     /// Return Card UUID/GUID component of CHUID
     pub fn uuid(&self) -> Uuid {
-        Uuid::from_slice(&self.0[CHUID_GUID_OFFS..(CHUID_GUID_OFFS + 16)])
-            .expect("should be UUID-sized")
+        Uuid::from_slice(&self.0[CHUID_GUID_OFFS..(CHUID_GUID_OFFS + 16)]).unwrap()
     }
 
     /// Return expiration date component of CHUID
@@ -101,18 +99,24 @@ impl ChuId {
     pub fn expiration(&self) -> [u8; Self::EXPIRATION_SIZE] {
         self.0[CHUID_EXPIRATION_OFFS..(CHUID_EXPIRATION_OFFS + Self::EXPIRATION_SIZE)]
             .try_into()
-            .expect("should be EXPIRATION_SIZE")
+            .unwrap()
     }
 
     /// Get Cardholder Unique Identifier (CHUID)
     pub fn get(yubikey: &mut YubiKey) -> Result<ChuId> {
         let txn = yubikey.begin_transaction()?;
         let response = txn.fetch_object(OBJ_CHUID)?;
-        Ok(response[..Self::BYTE_SIZE].try_into().map(Self)?)
+
+        if response.len() != CHUID_TMPL.len() {
+            return Err(Error::GenericError);
+        }
+
+        Ok(ChuId(response[..Self::BYTE_SIZE].try_into().unwrap()))
     }
 
     /// Set Cardholder Unique Identifier (CHUID)
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn set(&self, yubikey: &mut YubiKey) -> Result<()> {
         let mut buf = CHUID_TMPL.to_vec();
         buf[..Self::BYTE_SIZE].copy_from_slice(&self.0);

src/config.rs

@@ -111,7 +111,7 @@ impl Config {
                     error!("pin timestamp in admin metadata is an invalid size");
                 } else {
                     // TODO(tarcieri): double-check endianness is correct
-                    let pin_last_changed = u32::from_le_bytes([item[0], item[1], item[2], item[3]]);
+                    let pin_last_changed = u32::from_le_bytes(item.try_into().unwrap());
 
                     if pin_last_changed != 0 {
                         config.pin_last_changed =

src/error.rs

@@ -164,18 +164,6 @@ impl Display for Error {
     }
 }
 
-impl From<std::array::TryFromSliceError> for Error {
-    fn from(_: std::array::TryFromSliceError) -> Error {
-        Error::SizeError
-    }
-}
-
-impl From<std::time::SystemTimeError> for Error {
-    fn from(_: std::time::SystemTimeError) -> Error {
-        Error::GenericError
-    }
-}
-
 impl From<pcsc::Error> for Error {
     fn from(err: pcsc::Error) -> Error {
         Error::PcscError { inner: Some(err) }
@@ -191,9 +179,3 @@ impl std::error::Error for Error {
         }
     }
 }
-
-impl From<x509_cert::der::Error> for Error {
-    fn from(_err: x509_cert::der::Error) -> Error {
-        Error::ParseError
-    }
-}

src/lib.rs

@@ -2,16 +2,9 @@
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/iqlusioninc/yubikey.rs/main/img/logo-sq.png"
 )]
-#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 #![forbid(unsafe_code)]
-#![warn(
-    clippy::mod_module_files,
-    clippy::unwrap_used,
-    missing_docs,
-    rust_2018_idioms,
-    unused_lifetimes,
-    unused_qualifications
-)]
+#![warn(missing_docs, rust_2018_idioms, trivial_casts, unused_qualifications)]
 
 // Adapted from yubico-piv-tool:
 // <https://github.com/Yubico/yubico-piv-tool/>

src/metadata.rs

@@ -71,7 +71,7 @@ impl<T: MetadataType> Default for Metadata<T> {
     fn default() -> Self {
         Metadata {
             inner: Zeroizing::new(vec![]),
-            _marker: PhantomData,
+            _marker: PhantomData::default(),
         }
     }
 }
@@ -82,12 +82,13 @@ impl<T: MetadataType> Metadata<T> {
         let data = txn.fetch_object(T::obj_id())?;
         Ok(Metadata {
             inner: Tlv::parse_single(data, T::tag())?,
-            _marker: PhantomData,
+            _marker: PhantomData::default(),
         })
     }
 
     /// Write metadata
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub(crate) fn write(&self, txn: &Transaction<'_>) -> Result<()> {
         if self.inner.len() > CB_OBJ_MAX - CB_OBJ_TAG_MAX {
             return Err(Error::GenericError);
@@ -105,6 +106,7 @@ impl<T: MetadataType> Metadata<T> {
 
     /// Delete metadata
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub(crate) fn delete(txn: &Transaction<'_>) -> Result<()> {
         txn.save_object(T::obj_id(), &[])
     }
@@ -128,6 +130,7 @@ impl<T: MetadataType> Metadata<T> {
 
     /// Set metadata item
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub(crate) fn set_item(&mut self, tag: u8, item: &[u8]) -> Result<()> {
         let mut cb_temp: usize = 0;
         let mut tag_temp: u8 = 0;

src/mgm.rs

@@ -128,6 +128,7 @@ impl MgmKey {
 
     /// Get derived management key (MGM)
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn get_derived(yubikey: &mut YubiKey, pin: &[u8]) -> Result<Self> {
         let txn = yubikey.begin_transaction()?;
 
@@ -152,6 +153,7 @@ impl MgmKey {
 
     /// Get protected management key (MGM)
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn get_protected(yubikey: &mut YubiKey) -> Result<Self> {
         let txn = yubikey.begin_transaction()?;
 
@@ -182,6 +184,7 @@ impl MgmKey {
     ///
     /// This will wipe any metadata related to derived and PIN-protected management keys.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn set_default(yubikey: &mut YubiKey) -> Result<()> {
         MgmKey::default().set_manual(yubikey, false)
     }
@@ -193,6 +196,7 @@ impl MgmKey {
     ///
     /// This will wipe any metadata related to derived and PIN-protected management keys.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn set_manual(&self, yubikey: &mut YubiKey, require_touch: bool) -> Result<()> {
         let txn = yubikey.begin_transaction()?;
 
@@ -252,6 +256,7 @@ impl MgmKey {
     ///
     /// This enables key management operations to be performed with access to the PIN.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn set_protected(&self, yubikey: &mut YubiKey) -> Result<()> {
         let txn = yubikey.begin_transaction()?;
 

src/mscmap.rs

@@ -41,6 +41,7 @@ const TAG_MSCMAP: u8 = 0x81;
 ///
 /// Defined in Microsoft's Smart Card Minidriver Specification:
 /// <https://docs.microsoft.com/en-us/previous-versions/windows/hardware/design/dn631754(v=vs.85)>
+#[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
 #[derive(Clone, Debug)]
 pub struct MsContainer {
     /// Container name.
@@ -140,7 +141,7 @@ impl MsContainer {
         let name_bytes_len = Self::NAME_LEN * 2;
 
         for (i, chunk) in bytes[..name_bytes_len].chunks_exact(2).enumerate() {
-            name[i] = u16::from_le_bytes([chunk[0], chunk[1]]);
+            name[i] = u16::from_le_bytes(chunk.try_into().unwrap());
         }
 
         let mut cert_fingerprint = [0u8; 20];
@@ -150,10 +151,11 @@ impl MsContainer {
             name,
             slot: bytes[name_bytes_len].try_into()?,
             key_spec: bytes[name_bytes_len + 1],
-            key_size_bits: u16::from_le_bytes([
-                bytes[name_bytes_len + 2],
-                bytes[name_bytes_len + 3],
-            ]),
+            key_size_bits: u16::from_le_bytes(
+                bytes[(name_bytes_len + 2)..(name_bytes_len + 4)]
+                    .try_into()
+                    .unwrap(),
+            ),
             flags: bytes[name_bytes_len + 4],
             pin_id: bytes[name_bytes_len + 5],
             associated_echd_container: bytes[name_bytes_len + 6],
@@ -182,10 +184,7 @@ impl MsContainer {
         bytes.push(self.pin_id);
         bytes.push(self.associated_echd_container);
         bytes.extend_from_slice(&self.cert_fingerprint);
-        bytes
-            .as_slice()
-            .try_into()
-            .expect("should be REC_LEN-sized")
+        bytes.as_slice().try_into().unwrap()
     }
 }
 

src/msroots.rs

@@ -57,6 +57,7 @@ const TAG_MSROOTS_MID: u8 = 0x83;
 ///
 /// For more information, see:
 /// <https://docs.microsoft.com/en-us/windows-hardware/drivers/smartcard/developer-guidelines#-interoperability-with-msroots>
+#[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
 pub struct MsRoots(Vec<u8>);
 
 impl MsRoots {

src/piv.rs

@@ -44,7 +44,7 @@
 
 use crate::{
     apdu::{Ins, StatusWords},
-    certificate::{self, Certificate},
+    certificate::{self, Certificate, PublicKeyInfo},
     consts::CB_OBJ_MAX,
     error::{Error, Result},
     policy::{PinPolicy, TouchPolicy},
@@ -53,16 +53,15 @@ use crate::{
     yubikey::YubiKey,
     Buffer, ObjectId,
 };
-use elliptic_curve::{sec1::EncodedPoint as EcPublicKey, PublicKey};
+use elliptic_curve::sec1::EncodedPoint as EcPublicKey;
 use log::{debug, error, warn};
 use p256::NistP256;
 use p384::NistP384;
-use rsa::{pkcs8::EncodePublicKey, BigUint, RsaPublicKey};
+use rsa::{BigUint, RsaPublicKey};
 use std::{
     fmt::{Display, Formatter},
     str::FromStr,
 };
-use x509_cert::{der::Decode, spki::SubjectPublicKeyInfoOwned};
 
 #[cfg(feature = "untested")]
 use {
@@ -442,11 +441,10 @@ impl ManagementSlotId {
 }
 
 /// Personal Identity Verification (PIV) key slots
-pub const SLOTS: [SlotId; 28] = [
+pub const SLOTS: [SlotId; 27] = [
     SlotId::Authentication,
     SlotId::Signature,
     SlotId::KeyManagement,
-    SlotId::Attestation,
     SlotId::Retired(RetiredSlotId::R1),
     SlotId::Retired(RetiredSlotId::R2),
     SlotId::Retired(RetiredSlotId::R3),
@@ -521,6 +519,7 @@ impl AlgorithmId {
     }
 
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     fn get_elem_len(self) -> usize {
         match self {
             AlgorithmId::Rsa1024 => 64,
@@ -531,6 +530,7 @@ impl AlgorithmId {
     }
 
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     fn get_param_tag(self) -> u8 {
         match self {
             AlgorithmId::Rsa1024 | AlgorithmId::Rsa2048 => 0x01,
@@ -565,8 +565,11 @@ impl Key {
             };
 
             if !buf.is_empty() {
-                let cert = Certificate::from_bytes(buf)?;
-                keys.push(Key { slot, cert });
+	        match Certificate::from_bytes(buf) {
+		        Ok(cert) => keys.push(Key { slot, cert }),
+			Err(Error::InvalidObject) => {}        // skip slots we can't parse (e.g. Ed25519)
+			Err(other) => return Err(other),
+		}
 	    }
         }
 
@@ -591,7 +594,7 @@ pub fn generate(
     algorithm: AlgorithmId,
     pin_policy: PinPolicy,
     touch_policy: TouchPolicy,
-) -> Result<SubjectPublicKeyInfoOwned> {
+) -> Result<PublicKeyInfo> {
     // Keygen messages
     // TODO(tarcieri): extract these into an I18N-handling type?
     const SZ_SETTING_ROCA: &str = "Enable_Unsafe_Keygen_ROCA";
@@ -701,6 +704,7 @@ pub fn generate(
 }
 
 #[cfg(feature = "untested")]
+#[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
 fn write_key(
     yubikey: &mut YubiKey,
     slot: SlotId,
@@ -749,6 +753,7 @@ fn write_key(
 
 /// The key data that makes up an RSA key.
 #[cfg(feature = "untested")]
+#[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
 pub struct RsaKeyData {
     /// The secret prime `p`.
     p: Buffer,
@@ -764,12 +769,10 @@ pub struct RsaKeyData {
 
 #[cfg(feature = "untested")]
 impl RsaKeyData {
-    /// Generates a new RSA key data set from two (randomly generated) secret primes.
+    /// Generates a new RSA key data set from two randomly generated, secret, primes.
     ///
-    /// # Returns
-    /// - `Ok(key_data)` if `secret_p` and `secret_q` are valid primes.
-    /// - `Err(Error::AlgorithmError)` if `secret_p`/`secret_q` are invalid primes.
-    pub fn new(secret_p: &[u8], secret_q: &[u8]) -> Result<Self> {
+    /// Panics if `secret_p` or `secret_q` are invalid primes.
+    pub fn new(secret_p: &[u8], secret_q: &[u8]) -> Self {
         let p = BigUint::from_bytes_be(secret_p);
         let q = BigUint::from_bytes_be(secret_q);
 
@@ -780,10 +783,10 @@ impl RsaKeyData {
             p_t.lcm(&q_t)
         };
 
-        let exp = BigUint::from_u64(KEYDATA_RSA_EXP).ok_or(Error::AlgorithmError)?;
+        let exp = BigUint::from_u64(KEYDATA_RSA_EXP).unwrap();
 
-        let d = exp.mod_inverse(&totient).ok_or(Error::AlgorithmError)?;
-        let d = d.to_biguint().ok_or(Error::AlgorithmError)?;
+        let d = exp.mod_inverse(&totient).unwrap();
+        let d = d.to_biguint().unwrap();
 
         // We calculate the optimization values ahead of time, instead of making the user
         // do so.
@@ -791,16 +794,16 @@ impl RsaKeyData {
         let dp = &d % (&p - BigUint::one());
         let dq = &d % (&q - BigUint::one());
 
-        let qinv = q.clone().mod_inverse(&p).ok_or(Error::AlgorithmError)?;
+        let qinv = q.clone().mod_inverse(&p).unwrap();
         let (_, qinv) = qinv.to_bytes_be();
 
-        Ok(RsaKeyData {
+        RsaKeyData {
             p: Zeroizing::new(p.to_bytes_be()),
             q: Zeroizing::new(q.to_bytes_be()),
             dp: Zeroizing::new(dp.to_bytes_be()),
             dq: Zeroizing::new(dq.to_bytes_be()),
             qinv: Zeroizing::new(qinv),
-        })
+        }
     }
 
     fn total_len(&self) -> usize {
@@ -812,6 +815,7 @@ impl RsaKeyData {
 ///
 /// Errors if `algorithm` isn't `AlgorithmId::Rsa1024` or `AlgorithmId::Rsa2048`.
 #[cfg(feature = "untested")]
+#[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
 pub fn import_rsa_key(
     yubikey: &mut YubiKey,
     slot: SlotId,
@@ -846,6 +850,7 @@ pub fn import_rsa_key(
 ///
 /// Errors if `algorithm` isn't `AlgorithmId::EccP256` or ` AlgorithmId::EccP384`.
 #[cfg(feature = "untested")]
+#[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
 pub fn import_ecc_key(
     yubikey: &mut YubiKey,
     slot: SlotId,
@@ -874,6 +879,7 @@ pub fn import_ecc_key(
 ///
 /// <https://developers.yubico.com/PIV/Introduction/PIV_attestation.html>
 #[cfg(feature = "untested")]
+#[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
 pub fn attest(yubikey: &mut YubiKey, key: SlotId) -> Result<Buffer> {
     let templ = [0, Ins::Attest.code(), key.into(), 0];
     let txn = yubikey.begin_transaction()?;
@@ -909,6 +915,7 @@ pub fn sign_data(
 
 /// Decrypt data using a PIV key.
 #[cfg(feature = "untested")]
+#[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
 pub fn decrypt_data(
     yubikey: &mut YubiKey,
     input: &[u8],
@@ -951,7 +958,7 @@ pub struct SlotMetadata {
     /// Imported or generated key
     pub origin: Option<Origin>,
     /// Pub key of the key
-    pub public: Option<SubjectPublicKeyInfoOwned>,
+    pub public: Option<PublicKeyInfo>,
     /// Whether PIN PUK and management key are default
     pub default: Option<bool>,
     /// Number of retries left
@@ -1106,7 +1113,7 @@ fn read_public_key(
     algorithm: AlgorithmId,
     input: &[u8],
     skip_asn1_tag: bool,
-) -> Result<SubjectPublicKeyInfoOwned> {
+) -> Result<PublicKeyInfo> {
     // TODO(str4d): Response is wrapped in an ASN.1 TLV:
     //
     //    0x7f 0x49 -> Application | Constructed | 0x49
@@ -1155,17 +1162,14 @@ fn read_public_key(
             }
             let exp = exp_tlv.value.to_vec();
 
-            let pubkey = RsaPublicKey::new(
+            Ok(PublicKeyInfo::Rsa {
+                algorithm,
+                pubkey: RsaPublicKey::new(
                     BigUint::from_bytes_be(&modulus),
                     BigUint::from_bytes_be(&exp),
                 )
-            .map_err(|_| Error::InvalidObject)?;
-            Ok(SubjectPublicKeyInfoOwned::from_der(
-                pubkey
-                    .to_public_key_der()
-                    .map_err(|_| Error::ParseError)?
-                    .as_bytes(),
-            )?)
+                .map_err(|_| Error::InvalidObject)?,
+            })
         }
         AlgorithmId::EccP256 | AlgorithmId::EccP384 => {
             // 2-byte ASN.1 tag, 1-byte length (because all supported EC pubkey lengths
@@ -1193,22 +1197,16 @@ fn read_public_key(
 
             let point = tlv.value.to_vec();
 
-            let pubkey = match algorithm {
-                AlgorithmId::EccP256 => PublicKey::<NistP256>::try_from(
-                    EcPublicKey::<NistP256>::from_bytes(point).map_err(|_| Error::InvalidObject)?,
-                )
-                .map_err(|_| Error::InvalidObject)?
-                .to_public_key_der(),
-                AlgorithmId::EccP384 => PublicKey::<NistP384>::try_from(
-                    EcPublicKey::<NistP384>::from_bytes(point).map_err(|_| Error::InvalidObject)?,
-                )
-                .map_err(|_| Error::InvalidObject)?
-                .to_public_key_der(),
+            match algorithm {
+                AlgorithmId::EccP256 => {
+                    EcPublicKey::<NistP256>::from_bytes(point).map(PublicKeyInfo::EcP256)
+                }
+                AlgorithmId::EccP384 => {
+                    EcPublicKey::<NistP384>::from_bytes(point).map(PublicKeyInfo::EcP384)
+                }
                 _ => return Err(Error::AlgorithmError),
             }
-            .map_err(|_| Error::InvalidObject)?;
-
-            Ok(SubjectPublicKeyInfoOwned::from_der(pubkey.as_bytes())?)
+            .map_err(|_| Error::InvalidObject)
         }
     }
 }

src/reader.rs

@@ -1,6 +1,6 @@
 //! Support for enumerating available PC/SC card readers.
 
-use crate::{Error, Result, YubiKey};
+use crate::{Result, YubiKey};
 use std::{
     borrow::Cow,
     ffi::CStr,
@@ -43,8 +43,7 @@ impl Context {
         let Self { ctx, reader_names } = self;
 
         let reader_cstrs: Vec<_> = {
-            // TODO(tarcieri): better error?
-            let c = ctx.lock().map_err(|_| Error::GenericError)?;
+            let c = ctx.lock().unwrap();
 
             // ensure PC/SC context is valid
             c.is_valid()?;
@@ -91,8 +90,7 @@ impl<'ctx> Reader<'ctx> {
 
     /// Connect to this reader, returning its `pcsc::Card`.
     pub(crate) fn connect(&self) -> Result<pcsc::Card> {
-        // TODO(tarcieri): better error?
-        let ctx = self.ctx.lock().map_err(|_| Error::GenericError)?;
+        let ctx = self.ctx.lock().unwrap();
         Ok(ctx.connect(self.name, pcsc::ShareMode::Shared, pcsc::Protocols::T1)?)
     }
 }

src/transaction.rs

@@ -96,7 +96,11 @@ impl<'tx> Transaction<'tx> {
             return Err(Error::GenericError);
         }
 
-        Ok(response.data()[..3].try_into().map(Version::new)?)
+        if response.data().len() < 3 {
+            return Err(Error::SizeError);
+        }
+
+        Ok(Version::new(response.data()[..3].try_into().unwrap()))
     }
 
     /// Get YubiKey device serial number.

src/yubikey.rs

@@ -178,45 +178,28 @@ impl fmt::Debug for YubiKey {
 impl YubiKey {
     /// Open a connection to a YubiKey.
     ///
-    /// Returns an error if more than one YubiKey is detected (or none at all).
-    ///
-    /// NOTE: If multiple YubiKeys are connected, but we are only able to
-    /// open one of them (e.g. because the other one is in use, and the
-    /// connection doesn't allow sharing), the YubiKey that we were able to
-    /// open is returned.
+    /// Returns an error if there is more than one YubiKey detected.
     ///
     /// If you need to operate in environments with more than one YubiKey
     /// attached to the same system, use [`YubiKey::open_by_serial`] or
     /// [`yubikey::reader::Context`][`Context`] to select from the available
     /// PC/SC readers.
     pub fn open() -> Result<Self> {
-        let mut yubikey: Option<Self> = None;
-
         let mut readers = Context::open()?;
-        for reader in readers.iter()? {
-            if let Ok(yk_found) = reader.open() {
-                if let Some(yk_stored) = yubikey {
-                    // We found two YubiKeys, so we won't use either.
-                    // Don't reset them.
-                    let _ = yk_stored.disconnect(pcsc::Disposition::LeaveCard);
-                    let _ = yk_found.disconnect(pcsc::Disposition::LeaveCard);
+        let mut reader_iter = readers.iter()?;
 
+        if let Some(reader) = reader_iter.next() {
+            if reader_iter.next().is_some() {
                 error!("multiple YubiKeys detected!");
                 return Err(Error::PcscError { inner: None });
-                } else {
-                    yubikey = Some(yk_found);
-                }
-            }
             }
 
-        if let Some(yubikey) = yubikey {
-            // We found exactly one YubiKey that we could open, so we return it.
-            Ok(yubikey)
-        } else {
+            return reader.open();
+        }
+
         error!("no YubiKey detected!");
         Err(Error::NotFound)
     }
-    }
 
     /// Open a YubiKey with a specific serial number.
     pub fn open_by_serial(serial: Serial) -> Result<Self> {
@@ -260,6 +243,7 @@ impl YubiKey {
 
     /// Reconnect to a YubiKey.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn reconnect(&mut self) -> Result<()> {
         info!("trying to reconnect to current reader");
 
@@ -371,7 +355,7 @@ impl YubiKey {
         }
 
         // send a response to the cards challenge and a challenge of our own.
-        let response = mgm_key.decrypt(challenge.data()[4..12].try_into()?);
+        let response = mgm_key.decrypt(challenge.data()[4..12].try_into().unwrap());
 
         let mut data = [0u8; 22];
         data[0] = TAG_DYN_AUTH;
@@ -413,6 +397,7 @@ impl YubiKey {
 
     /// Deauthenticate.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn deauthenticate(&mut self) -> Result<()> {
         let txn = self.begin_transaction()?;
 
@@ -471,6 +456,7 @@ impl YubiKey {
 
     /// Set the number of PIN retries.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn set_pin_retries(&mut self, pin_tries: u8, puk_tries: u8) -> Result<()> {
         // Special case: if either retry count is 0, it's a successful no-op
         if pin_tries == 0 || puk_tries == 0 {
@@ -495,6 +481,7 @@ impl YubiKey {
     ///
     /// The default PIN code is `123456`.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn change_pin(&mut self, current_pin: &[u8], new_pin: &[u8]) -> Result<()> {
         {
             let txn = self.begin_transaction()?;
@@ -510,6 +497,7 @@ impl YubiKey {
 
     /// Set PIN last changed.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn set_pin_last_changed(yubikey: &mut YubiKey) -> Result<()> {
         let txn = yubikey.begin_transaction()?;
 
@@ -517,7 +505,8 @@ impl YubiKey {
 
         // TODO(tarcieri): double check this is little endian
         let tnow = SystemTime::now()
-            .duration_since(UNIX_EPOCH)?
+            .duration_since(UNIX_EPOCH)
+            .unwrap()
             .as_secs()
             .to_le_bytes();
 
@@ -544,6 +533,7 @@ impl YubiKey {
     ///
     /// The default PUK code is `12345678`.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn change_puk(&mut self, current_puk: &[u8], new_puk: &[u8]) -> Result<()> {
         let txn = self.begin_transaction()?;
         txn.change_ref(ChangeRefAction::ChangePuk, current_puk, new_puk)
@@ -551,6 +541,7 @@ impl YubiKey {
 
     /// Block PUK: permanently prevent the PIN from becoming unblocked.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn block_puk(&mut self) -> Result<()> {
         let mut puk = [0x30, 0x42, 0x41, 0x44, 0x46, 0x30, 0x30, 0x44];
         let mut tries_remaining: i32 = -1;
@@ -614,6 +605,7 @@ impl YubiKey {
     /// Unblock a Personal Identification Number (PIN) using a previously
     /// configured PIN Unblocking Key (PUK).
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn unblock_pin(&mut self, puk: &[u8], new_pin: &[u8]) -> Result<()> {
         let txn = self.begin_transaction()?;
         txn.change_ref(ChangeRefAction::UnblockPin, puk, new_pin)
@@ -621,6 +613,7 @@ impl YubiKey {
 
     /// Fetch an object from the YubiKey.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn fetch_object(&mut self, object_id: ObjectId) -> Result<Buffer> {
         let txn = self.begin_transaction()?;
         txn.fetch_object(object_id)
@@ -628,6 +621,7 @@ impl YubiKey {
 
     /// Save an object.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn save_object(&mut self, object_id: ObjectId, indata: &mut [u8]) -> Result<()> {
         let txn = self.begin_transaction()?;
         txn.save_object(object_id, indata)
@@ -635,6 +629,7 @@ impl YubiKey {
 
     /// Get an auth challenge.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn get_auth_challenge(&mut self) -> Result<[u8; 8]> {
         let txn = self.begin_transaction()?;
 
@@ -647,15 +642,12 @@ impl YubiKey {
             return Err(Error::AuthenticationError);
         }
 
-        Ok(response
-            .data()
-            .get(4..12)
-            .ok_or(Error::SizeError)?
-            .try_into()?)
+        Ok(response.data()[4..12].try_into().unwrap())
     }
 
     /// Verify an auth response.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn verify_auth_response(&mut self, response: [u8; 8]) -> Result<()> {
         let mut data = [0u8; 12];
         data[0] = 0x7c;
@@ -686,6 +678,7 @@ impl YubiKey {
     ///
     /// The reset function is only available when both pins are blocked.
     #[cfg(feature = "untested")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "untested")))]
     pub fn reset_device(&mut self) -> Result<()> {
         let templ = [0, Ins::Reset.code(), 0, 0];
         let txn = self.begin_transaction()?;

tests/integration.rs

@@ -6,15 +6,14 @@
 use log::trace;
 use once_cell::sync::Lazy;
 use rand_core::{OsRng, RngCore};
-use rsa::{pkcs1v15, RsaPublicKey};
+use rsa::pkcs1v15;
 use sha2::{Digest, Sha256};
 use signature::hazmat::PrehashVerifier;
-use std::{env, str::FromStr, sync::Mutex, time::Duration};
-use x509_cert::{der::Encode, name::Name, serial_number::SerialNumber, time::Validity};
+use std::{env, str::FromStr, sync::Mutex};
+use x509::RelativeDistinguishedName;
 use yubikey::{
     certificate,
-    certificate::yubikey_signer,
-    certificate::Certificate,
+    certificate::{Certificate, PublicKeyInfo},
     piv::{self, AlgorithmId, Key, ManagementSlotId, RetiredSlotId, SlotId},
     Error, MgmKey, PinPolicy, Serial, TouchPolicy, YubiKey,
 };
@@ -148,7 +147,7 @@ fn test_set_mgmkey() {
 // Certificate support
 //
 
-fn generate_self_signed_cert<KT: yubikey_signer::KeyType>() -> Certificate {
+fn generate_self_signed_cert(algorithm: AlgorithmId) -> Certificate {
     let mut yubikey = YUBIKEY.lock().unwrap();
 
     assert!(yubikey.verify_pin(b"123456").is_ok());
@@ -160,28 +159,25 @@ fn generate_self_signed_cert<KT: yubikey_signer::KeyType>() -> Certificate {
     let generated = piv::generate(
         &mut yubikey,
         slot,
-        KT::ALGORITHM,
+        algorithm,
         PinPolicy::Default,
         TouchPolicy::Default,
     )
     .unwrap();
 
-    // 0x80 0x00 ... (20bytes) is invalid because of high MSB (serial will keep the sign)
-    // we'll limit ourselves to 19 bytes serial.
-    let mut serial = [0u8; 19];
+    let mut serial = [0u8; 20];
     OsRng.fill_bytes(&mut serial);
-    let serial = SerialNumber::new(&serial[..]).expect("serial can't be more than 20 bytes long");
-    let validity = Validity::from_now(Duration::new(500000, 0)).unwrap();
 
     // Generate a self-signed certificate for the new key.
-    let cert_result = Certificate::generate_self_signed::<_, KT>(
+    let extensions: &[x509::Extension<'_, &[u64]>] = &[];
+    let cert_result = Certificate::generate_self_signed(
         &mut yubikey,
         slot,
         serial,
-        validity,
-        Name::from_str("CN=testSubject").expect("parse name"),
+        None,
+        &[RelativeDistinguishedName::common_name("testSubject")],
         generated,
-        |_builder| Ok(()),
+        extensions,
     );
 
     assert!(cert_result.is_ok());
@@ -193,16 +189,18 @@ fn generate_self_signed_cert<KT: yubikey_signer::KeyType>() -> Certificate {
 #[test]
 #[ignore]
 fn generate_self_signed_rsa_cert() {
-    let cert = generate_self_signed_cert::<yubikey_signer::YubiRsa<yubikey_signer::Rsa1024>>();
+    let cert = generate_self_signed_cert(AlgorithmId::Rsa1024);
 
     //
     // Verify that the certificate is signed correctly
     //
 
-    let pubkey = RsaPublicKey::try_from(cert.subject_pki()).expect("valid rsa key");
-    let pubkey = pkcs1v15::VerifyingKey::<Sha256>::new(pubkey);
+    let pubkey = match cert.subject_pki() {
+        PublicKeyInfo::Rsa { pubkey, .. } => pkcs1v15::VerifyingKey::<Sha256>::from(pubkey.clone()),
+        _ => unreachable!(),
+    };
 
-    let data = cert.cert.to_der().expect("serialize certificate");
+    let data = cert.as_ref();
     let tbs_cert_len = u16::from_be_bytes(data[6..8].try_into().unwrap()) as usize;
     let msg = &data[4..8 + tbs_cert_len];
     let sig = pkcs1v15::Signature::try_from(&data[data.len() - 128..]).unwrap();
@@ -214,20 +212,24 @@ fn generate_self_signed_rsa_cert() {
 #[test]
 #[ignore]
 fn generate_self_signed_ec_cert() {
-    let cert = generate_self_signed_cert::<p256::NistP256>();
+    let cert = generate_self_signed_cert(AlgorithmId::EccP256);
 
     //
     // Verify that the certificate is signed correctly
     //
 
-    let vk = p256::ecdsa::VerifyingKey::try_from(cert.subject_pki()).expect("ecdsa key expected");
+    let pubkey = match cert.subject_pki() {
+        PublicKeyInfo::EcP256(pubkey) => pubkey,
+        _ => unreachable!(),
+    };
 
-    let data = cert.cert.to_der().expect("serialize certificate");
+    let data = cert.as_ref();
     let tbs_cert_len = data[6] as usize;
     let sig_algo_len = data[7 + tbs_cert_len + 1] as usize;
     let sig_start = 7 + tbs_cert_len + 2 + sig_algo_len + 3;
     let msg = &data[4..7 + tbs_cert_len];
     let sig = p256::ecdsa::Signature::from_der(&data[sig_start..]).unwrap();
+    let vk = p256::ecdsa::VerifyingKey::from_sec1_bytes(pubkey.as_bytes()).unwrap();
 
     use p256::ecdsa::signature::Verifier;
     assert!(vk.verify(msg, &sig).is_ok());
@@ -267,11 +269,11 @@ fn test_slot_id_display() {
 
     assert_eq!(
         format!("{}", SlotId::Management(ManagementSlotId::Pin)),
-        "Pin"
+        "PIN"
     );
     assert_eq!(
         format!("{}", SlotId::Management(ManagementSlotId::Puk)),
-        "Puk"
+        "PUK"
     );
     assert_eq!(
         format!("{}", SlotId::Management(ManagementSlotId::Management)),
@@ -303,14 +305,53 @@ fn test_read_metadata() {
     )
     .unwrap();
 
-    match piv::metadata(&mut yubikey, slot) {
-        Ok(metadata) => assert_eq!(metadata.public, Some(generated)),
-        Err(Error::NotSupported) => {
-            // Some YubiKeys don't support metadata
-            eprintln!("metadata not supported by this YubiKey");
-        }
-        Err(err) => panic!("{}", err),
+    let metadata = piv::metadata(&mut yubikey, slot).unwrap();
+
+    assert_eq!(metadata.public, Some(generated));
 }
+
+#[test]
+#[ignore]
+fn test_serial_string_conversions() {
+    //2^152+1
+    let serial: [u8; 20] = [
+        0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x01,
+    ];
+
+    let s = certificate::Serial::from(serial);
+    assert_eq!(
+        s.as_x509_int(),
+        "5708990770823839524233143877797980545530986497"
+    );
+    assert_eq!(
+        s.as_x509_hex(),
+        "01:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:01"
+    );
+
+    let serial2: [u8; 20] = [
+        0xA1, 0xF3, 0x02, 0x30, 0x76, 0x01, 0x32, 0x48, 0x09, 0x9C, 0x10, 0xAA, 0x3F, 0xA0, 0x54,
+        0x0D, 0xC0, 0xB7, 0x65, 0x01,
+    ];
+
+    let s2 = certificate::Serial::from(serial2);
+    assert_eq!(
+        s2.as_x509_int(),
+        "924566785900861696177829411010986812227211191553"
+    );
+    assert_eq!(
+        s2.as_x509_hex(),
+        "a1:f3:02:30:76:01:32:48:09:9c:10:aa:3f:a0:54:0d:c0:b7:65:01"
+    );
+
+    let serial3: [u8; 20] = [
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAA, 0x3F, 0xA0, 0x54,
+        0x0D, 0xC0, 0xB7, 0x65, 0x01,
+    ];
+
+    let s3 = certificate::Serial::from(serial3);
+    assert_eq!(s3.as_x509_int(), "3140531249369331492097");
+    assert_eq!(s3.as_x509_hex(), "aa:3f:a0:54:0d:c0:b7:65:01");
 }
 
 #[test]