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fix(ecash): cast usize to u64 in to_bytes() for 32-bit platform compatibility (#6528)

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VerificationKeyAuth::to_bytes() and SecretKeyAuth::to_bytes() used
usize::to_le_bytes() to serialize vector lengths, producing 4 bytes on
32-bit and 8 bytes on 64-bit. Since from_bytes() always reads 8 bytes
(u64), this caused ZK proof challenge hash mismatches when a 32-bit
client's proof was verified by a 64-bit gateway, resulting in
"the provided ticket failed to get verified" on all 32-bit platforms.
This commit is contained in:
ZM
2026-05-19 09:17:24 -05:00
committed by GitHub
parent d3b6a270de
commit 227e6a10e1
1 changed files with 2 additions and 2 deletions
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common/nym_offline_compact_ecash/src/scheme/keygen.rs
+2 -2
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@@ -112,7 +112,7 @@ impl SecretKeyAuth {
let ys_len = self.ys.len();
let mut bytes = Vec::with_capacity(8 + (ys_len + 1) * 32);
bytes.extend_from_slice(&self.x.to_bytes());
bytes.extend_from_slice(&ys_len.to_le_bytes());
bytes.extend_from_slice(&(ys_len as u64).to_le_bytes());
for y in self.ys.iter() {
bytes.extend_from_slice(&y.to_bytes())
}
@@ -337,7 +337,7 @@ impl VerificationKeyAuth {
bytes.extend_from_slice(&self.alpha.to_affine().to_compressed());
bytes.extend_from_slice(&beta_g1_len.to_le_bytes());
bytes.extend_from_slice(&(beta_g1_len as u64).to_le_bytes());
for beta_g1 in self.beta_g1.iter() {
bytes.extend_from_slice(&beta_g1.to_affine().to_compressed())