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zcash_note_encryption: Constrain outgoing ciphertext size 

This replaces a length assertion, making the API more predictable.
This commit is contained in:
Jack Grigg 2021-12-17 05:22:24 +00:00
parent 4fcd83d74e
commit 76f364593a
1 changed files with 2 additions and 3 deletions
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5
components/zcash_note_encryption/src/lib.rs
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@ -537,7 +537,7 @@ pub fn try_output_recovery_with_ovk<D: Domain, Output: ShieldedOutput<D, ENC_CIP
ovk: &D::OutgoingViewingKey,
output: &Output,
cv: &D::ValueCommitment,
out_ciphertext: &[u8],
out_ciphertext: &[u8; OUT_CIPHERTEXT_SIZE],
) -> Option<(D::Note, D::Recipient, D::Memo)> {
let ock = D::derive_ock(ovk, &cv, &output.cmstar_bytes(), &output.ephemeral_key());
try_output_recovery_with_ock(domain, &ock, output, out_ciphertext)
@ -556,10 +556,9 @@ pub fn try_output_recovery_with_ock<D: Domain, Output: ShieldedOutput<D, ENC_CIP
domain: &D,
ock: &OutgoingCipherKey,
output: &Output,
out_ciphertext: &[u8],
out_ciphertext: &[u8; OUT_CIPHERTEXT_SIZE],
) -> Option<(D::Note, D::Recipient, D::Memo)> {
let enc_ciphertext = output.enc_ciphertext();
assert_eq!(out_ciphertext.len(), OUT_CIPHERTEXT_SIZE);
let mut op = OutPlaintextBytes([0; OUT_PLAINTEXT_SIZE]);
op.0.copy_from_slice(&out_ciphertext[..OUT_PLAINTEXT_SIZE]);