Encryption-at-rest: Support for AES-256-GCM and ChaCha20-Poly1305 for S/MIME (closes #161)

Cargo.lock

@@ -1116,6 +1116,17 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
 
+[[package]]
+name = "chacha20"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3613f74bd2eac03dad61bd53dbe620703d4371614fe0bc3b9f04dd36fe4e818"
+dependencies = [
+ "cfg-if",
+ "cipher 0.4.4",
+ "cpufeatures 0.2.17",
+]
+
 [[package]]
 name = "chacha20"
 version = "0.10.1"
@@ -1127,6 +1138,19 @@ dependencies = [
  "rand_core 0.10.1",
 ]
 
+[[package]]
+name = "chacha20poly1305"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "10cd79432192d1c0f4e1a0fef9527696cc039165d729fb41b3f4f4f354c2dc35"
+dependencies = [
+ "aead",
+ "chacha20 0.9.1",
+ "cipher 0.4.4",
+ "poly1305",
+ "zeroize",
+]
+
 [[package]]
 name = "chrono"
 version = "0.4.45"
@@ -2263,6 +2287,7 @@ dependencies = [
  "aes-gcm",
  "aes-gcm-siv",
  "cbc 0.2.1",
+ "chacha20poly1305",
  "common",
  "compact_str",
  "directory",
@@ -5528,6 +5553,17 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "poly1305"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8159bd90725d2df49889a078b54f4f79e87f1f8a8444194cdca81d38f5393abf"
+dependencies = [
+ "cpufeatures 0.2.17",
+ "opaque-debug",
+ "universal-hash",
+]
+
 [[package]]
 name = "polyval"
 version = "0.6.2"
@@ -6037,7 +6073,7 @@ version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d2e8e8bcc7961af1fdac401278c6a831614941f6164ee3bf4ce61b7edb162207"
 dependencies = [
- "chacha20",
+ "chacha20 0.10.1",
  "getrandom 0.4.3",
  "rand_core 0.10.1",
 ]
@@ -6591,6 +6627,7 @@ dependencies = [
  "pkcs1",
  "pkcs8",
  "rand_core 0.6.4",
+ "sha2 0.10.9",
  "signature",
  "spki",
  "subtle",