Implement MultipartSign/Verify#525
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tarcieri merged 3 commits intoRustCrypto:masterfrom Jun 3, 2025
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This PR adds new traits for multipart messages: `MultipartSigner`, `RandomizedMultipartSigner`, `RandomizedMultipartSignerMut` and `MultipartVerifier`. The idea here is to allow non-contiguous bytes to be passed, which is necessary when the message has to be constructed from multiple sources without wanting to allocate memory for a contiguous message. E.g. for `no_std` environments or when the message is rather big but pre-hashing is not applicable, e.g. PureEdDSA, ML-DSA or SLH-DSA. I know this is a rather big breaking change, so let me know what you think! These new traits can be implemented by a bunch of crates: - [x] `ecdsa`: RustCrypto/signatures#982 - [x] `ml-dsa`: RustCrypto/signatures#982 - [x] `slh-dsa`: RustCrypto/signatures#982 - [x] `bign256`: RustCrypto/elliptic-curves#1221 - [x] `sm2`: RustCrypto/elliptic-curves#1221 - [x] `k256`: RustCrypto/elliptic-curves#1221 - [x] `dsa`: RustCrypto/signatures#982 - [x] `lms`: RustCrypto/signatures#982 - [x] `rsa`: RustCrypto/RSA#525 - [ ] `ed25519-dalek` Resolves RustCrypto/signatures#959.
tarcieri
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takumi-earth
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Jan 27, 2026
Implementation of `MultipartSigner` and `MultipartVerifier` added in RustCrypto/traits#1880.
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Implementation of
MultipartSignerandMultipartVerifieradded in RustCrypto/traits#1880.