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zk-token-sdk: constant time equality check for elgamal and aes key derivation (#27364) 

zk-token-sdk: use constant time equality check for elgamal and aes key derivation
This commit is contained in:
samkim-crypto 2022-08-24 18:56:55 +09:00 committed by GitHub
parent 0ea984ae20
commit 5e8b8abd84
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 3 additions and 2 deletions
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3
zk-token-sdk/src/encryption/auth_encryption.rs
View File

@ -16,6 +16,7 @@ use {
signer::{Signer, SignerError},
},
std::{convert::TryInto, fmt},
subtle::ConstantTimeEq,
zeroize::Zeroize,
};
@ -71,7 +72,7 @@ impl AeKey {
// Some `Signer` implementations return the default signature, which is not suitable for
// use as key material
if signature == Signature::default() {
if bool::from(signature.as_ref().ct_eq(Signature::default().as_ref())) {
Err(SignerError::Custom("Rejecting default signature".into()))
} else {
Ok(AeKey(signature.as_ref()[..16].try_into().unwrap()))

2
zk-token-sdk/src/encryption/elgamal.rs
View File

@ -166,7 +166,7 @@ impl ElGamalKeypair {
// Some `Signer` implementations return the default signature, which is not suitable for
// use as key material
if signature == Signature::default() {
if bool::from(signature.as_ref().ct_eq(Signature::default().as_ref())) {
return Err(SignerError::Custom("Rejecting default signature".into()));
}