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ed448-goldilocks: enforce RFC 8032 context length in Ed448 verification #1387

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ed448-goldilocks: enforce RFC 8032 context length in Ed448 verification #1387

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03bcec5
Enforce RFC 8032 context length in Ed448 verification
radik878 Sep 2, 2025
c75ad76
Update ed448-goldilocks/src/sign/verifying_key.rs
radik878 Sep 14, 2025
444ac97
Update ed448-goldilocks/src/sign/verifying_key.rs
radik878 Sep 14, 2025
187f08d
Update verifying_key.rs
radik878 Sep 14, 2025
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5 changes: 5 additions & 0 deletions ed448-goldilocks/src/sign/verifying_key.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -279,6 +279,11 @@ impl VerifyingKey {
return Err(SigningError::InvalidSignatureSComponent.into());
}

// RFC 8032 mandates context length <= 255 bytes. Enforce consistently with signing path.
if ctx.len() > 255 {
return Err(SigningError::PrehashedContextLength.into());
}

// SHAKE256(dom4(F, C) || R || A || PH(M), 114) -> scalar k
let mut bytes = WideEdwardsScalarBytes::default();
let ctx_len = ctx.len() as u8;
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