Enable users to skip YubiKeys at plugging-in time

This requires the `confirm` plugin command to be supported by the age
client; otherwise we fall back to the previous message-plus-timer
method.

Cargo.lock

@@ -20,27 +20,27 @@ dependencies = [
 [[package]]
 name = "age-core"
 version = "0.7.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70afa630ef12a4fc666277713efbe6da2bc87bb3f3af0f1149415b701362c615"
+source = "git+https://github.com/str4d/rage.git?rev=fdb518c6d802a3618b47d959d56af6e60c668627#fdb518c6d802a3618b47d959d56af6e60c668627"
 dependencies = [
  "base64",
  "chacha20poly1305",
  "cookie-factory",
  "hkdf",
+ "io_tee",
  "nom",
  "rand",
  "secrecy",
- "sha2",
+ "sha2 0.10.2",
  "tempfile",
 ]
 
 [[package]]
 name = "age-plugin"
 version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74049e94d591e0b96128880bb9dcbc5f27432b3089725524d020616e1dc36e2b"
+source = "git+https://github.com/str4d/rage.git?rev=fdb518c6d802a3618b47d959d56af6e60c668627#fdb518c6d802a3618b47d959d56af6e60c668627"
 dependencies = [
  "age-core",
+ "base64",
  "bech32",
  "chrono",
 ]
@@ -68,7 +68,7 @@ dependencies = [
  "pcsc",
  "rand",
  "rust-embed",
- "sha2",
+ "sha2 0.9.9",
  "which",
  "x509",
  "x509-parser",
@@ -149,6 +149,15 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bf7fe51849ea569fd452f37822f606a5cabb684dc918707a0193fd4664ff324"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "byteorder"
 version = "1.4.3"
@@ -265,6 +274,16 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "crypto-common"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57952ca27b5e3606ff4dd79b0020231aaf9d6aa76dc05fd30137538c50bd3ce8"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
 [[package]]
 name = "crypto-mac"
 version = "0.11.1"
@@ -357,6 +376,17 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "digest"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2fb860ca6fafa5552fb6d0e816a69c8e49f0908bf524e30a90d97c85892d506"
+dependencies = [
+ "block-buffer 0.10.2",
+ "crypto-common",
+ "subtle",
+]
+
 [[package]]
 name = "ecdsa"
 version = "0.12.4"
@@ -365,7 +395,7 @@ checksum = "43ee23aa5b4f68c7a092b5c3beb25f50c406adc75e2363634f242f28ab255372"
 dependencies = [
  "der",
  "elliptic-curve",
- "hmac",
+ "hmac 0.11.0",
  "signature",
 ]
 
@@ -563,12 +593,11 @@ checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
 name = "hkdf"
-version = "0.11.0"
+version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01706d578d5c281058480e673ae4086a9f4710d8df1ad80a5b03e39ece5f886b"
+checksum = "791a029f6b9fc27657f6f188ec6e5e43f6911f6f878e0dc5501396e09809d437"
 dependencies = [
- "digest",
- "hmac",
+ "hmac 0.12.1",
 ]
 
 [[package]]
@@ -578,7 +607,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a2a2320eb7ec0ebe8da8f744d7812d9fc4cb4d09344ac01898dbcb6a20ae69b"
 dependencies = [
  "crypto-mac",
- "digest",
+ "digest 0.9.0",
+]
+
+[[package]]
+name = "hmac"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
+dependencies = [
+ "digest 0.10.3",
 ]
 
 [[package]]
@@ -685,6 +723,12 @@ dependencies = [
  "unic-langid",
 ]
 
+[[package]]
+name = "io_tee"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b3f7cef34251886990511df1c61443aa928499d598a9473929ab5a90a527304"
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -917,7 +961,7 @@ checksum = "d053368e1bae4c8a672953397bd1bd7183dde1c72b0b7612a15719173148d186"
 dependencies = [
  "ecdsa",
  "elliptic-curve",
- "sha2",
+ "sha2 0.9.9",
 ]
 
 [[package]]
@@ -1156,7 +1200,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e05c2603e2823634ab331437001b411b9ed11660fbc4066f3908c84a9439260d"
 dependencies = [
  "byteorder",
- "digest",
+ "digest 0.9.0",
  "lazy_static",
  "num-bigint-dig",
  "num-integer",
@@ -1199,7 +1243,7 @@ version = "7.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "756feca3afcbb1487a1d01f4ecd94cf8ec98ea074c55a69e7136d29fb6166029"
 dependencies = [
- "sha2",
+ "sha2 0.9.9",
  "walkdir",
 ]
 
@@ -1274,10 +1318,10 @@ version = "0.9.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "99cd6713db3cf16b6c84e06321e049a9b9f699826e16096d23bbcc44d15d51a6"
 dependencies = [
- "block-buffer",
+ "block-buffer 0.9.0",
  "cfg-if",
  "cpufeatures",
- "digest",
+ "digest 0.9.0",
  "opaque-debug",
 ]
 
@@ -1287,20 +1331,31 @@ version = "0.9.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
 dependencies = [
- "block-buffer",
+ "block-buffer 0.9.0",
  "cfg-if",
  "cpufeatures",
- "digest",
+ "digest 0.9.0",
  "opaque-debug",
 ]
 
+[[package]]
+name = "sha2"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55deaec60f81eefe3cce0dc50bda92d6d8e88f2a27df7c5033b42afeb1ed2676"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest 0.10.3",
+]
+
 [[package]]
 name = "signature"
 version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2807892cfa58e081aa1f1111391c7a0649d4fa127a4ffbe34bcbfb35a1171a4"
 dependencies = [
- "digest",
+ "digest 0.9.0",
  "rand_core",
 ]
 
@@ -1658,7 +1713,7 @@ dependencies = [
  "der-parser",
  "des",
  "elliptic-curve",
- "hmac",
+ "hmac 0.11.0",
  "log",
  "nom",
  "num-bigint-dig",
@@ -1672,7 +1727,7 @@ dependencies = [
  "rsa",
  "secrecy",
  "sha-1",
- "sha2",
+ "sha2 0.9.9",
  "subtle",
  "subtle-encoding",
  "uuid",