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Include the scalar offset in the calculation of p

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This commit is contained in:
Luke Parker
2022-04-22 22:26:08 -04:00
parent 7421ed96ff
commit 76a6ff46be
1 changed files with 6 additions and 0 deletions
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6
sign/frost/src/sign.rs
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@@ -241,6 +241,11 @@ fn sign_with_share<C: Curve, A: Algorithm<C>>(
b.extend(&commitments[0 .. commit_len]); b.extend(&commitments[0 .. commit_len]);
} }
let offset = if params.keys.offset.is_some() {
C::F_to_le_bytes(&params.keys.offset.unwrap())
} else {
vec![]
};
let context = params.algorithm.context(); let context = params.algorithm.context();
let mut p = Vec::with_capacity(multisig_params.t); let mut p = Vec::with_capacity(multisig_params.t);
let mut pi = C::F::zero(); let mut pi = C::F::zero();
@@ -251,6 +256,7 @@ fn sign_with_share<C: Curve, A: Algorithm<C>>(
.chain(BINDING_DST) .chain(BINDING_DST)
.chain(u64::try_from(*l).unwrap().to_le_bytes()) .chain(u64::try_from(*l).unwrap().to_le_bytes())
.chain(Blake2b::new().chain(BINDING_MESSAGE_DST).chain(msg).finalize()) .chain(Blake2b::new().chain(BINDING_MESSAGE_DST).chain(msg).finalize())
.chain(&offset)
.chain(&context) .chain(&context)
.chain(&b) .chain(&b)
.finalize() .finalize()