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LibCrypto: Add early exit to SECP.verify if signature is invalid

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stelar7
2024-03-29 21:59:57 +01:00
committed by Andrew Kaster
parent ae230c9150
commit 54a3ffcd42
1 changed files with 5 additions and 0 deletions
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5
Userland/Libraries/LibCrypto/Curves/SECPxxxr1.h
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@@ -186,6 +186,11 @@ public:
auto r_bigint = TRY(asn1_decoder.read<Crypto::UnsignedBigInteger>(Crypto::ASN1::Class::Universal, Crypto::ASN1::Kind::Integer));
auto s_bigint = TRY(asn1_decoder.read<Crypto::UnsignedBigInteger>(Crypto::ASN1::Class::Universal, Crypto::ASN1::Kind::Integer));
size_t expected_word_count = KEY_BIT_SIZE / 32;
if (r_bigint.length() < expected_word_count || s_bigint.length() < expected_word_count) {
return false;
}
StorageType r = 0u;
StorageType s = 0u;
for (size_t i = 0; i < (KEY_BIT_SIZE / 32); i++) {