Remove dependency on regular num-bigint

Cargo.lock

@@ -424,7 +424,6 @@ dependencies = [
  "autocfg 1.0.0",
  "num-integer",
  "num-traits",
- "rand 0.5.6",
 ]
 
 [[package]]
@@ -1063,7 +1062,6 @@ dependencies = [
  "lazy_static",
  "log",
  "nom",
- "num-bigint",
  "num-bigint-dig",
  "num-integer",
  "num-traits",

Cargo.toml

@@ -31,8 +31,7 @@ getrandom = "0.1"
 hmac = "0.7"
 log = "0.4"
 nom = "5"
-num-bigint_rsa = { version = "0.6", features = ["rand"], package = "num-bigint-dig" }
-num-bigint = { version = "0.2", features = ["rand"] } 
+num-bigint = { version = "0.6", features = ["rand"], package = "num-bigint-dig" }
 num-traits = "0.2"
 num-integer = "0.1"
 pbkdf2 = "0.3"

src/certificate.rs

@@ -476,7 +476,8 @@ impl Certificate {
             _ => return Err(Error::InvalidObject),
         };
 
-        let serial = parsed_cert.tbs_certificate.serial.into();
+        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)?;

src/key.rs

@@ -59,7 +59,7 @@ use crate::{
 use elliptic_curve::weierstrass::PublicKey as EcPublicKey;
 use log::{error, warn};
 #[cfg(feature = "untested")]
-use num_bigint_rsa::traits::ModInverse;
+use num_bigint::traits::ModInverse;
 #[cfg(feature = "untested")]
 use num_integer::Integer;
 #[cfg(feature = "untested")]