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Clean and document the DKG library's encryption

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Encryption used to be inlined into FROST. When writing the documentation, I
realized it was decently hard to review. It also was antagonistic to other
hosted DKG algorithms by not allowing code re-use.

Encryption is now a standalone module, providing clear boundaries and
reusability.

Additionally, the DKG protocol itself used to use the ciphersuite's specified
hash function (with an HKDF to prevent length extension attacks). Now,
RecommendedTranscript is used to achieve much more robust transcripting and
remove the HKDF dependency. This does add Blake2 into all consumers yet is
preferred for its security properties and ease of review.
This commit is contained in:
Luke Parker
2022-12-07 17:20:20 -05:00
parent ba157ea84b
commit 13977f6287
8 changed files with 265 additions and 147 deletions
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2
crypto/dkg/src/promote.rs
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@@ -28,7 +28,7 @@ pub trait CiphersuitePromote<C2: Ciphersuite> {
}
fn transcript<G: GroupEncoding>(key: G, i: u16) -> RecommendedTranscript {
let mut transcript = RecommendedTranscript::new(b"FROST Generator Update");
let mut transcript = RecommendedTranscript::new(b"DKG Generator Promotion v0");
transcript.append_message(b"group_key", key.to_bytes());
transcript.append_message(b"participant", i.to_be_bytes());
transcript