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Fix P-256 ECDSA DER signature parsing

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This commit is contained in:
Zhi Guan
2026-06-30 10:57:31 +08:00
parent 37e96adb92
commit c5ee40e3df
1 changed files with 6 additions and 2 deletions
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8
src/secp256r1.c
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@@ -1526,6 +1526,8 @@ int secp256r1_ecdsa_signature_from_der(SECP256R1_ECDSA_SIGNATURE *sig, const uin
const uint8_t *d;
const uint8_t *r;
const uint8_t *s;
uint8_t rbuf[32] = {0};
uint8_t sbuf[32] = {0};
size_t dlen, rlen, slen;
if ((ret = asn1_sequence_from_der(&d, &dlen, in, inlen)) != 1) {
@@ -1541,8 +1543,10 @@ int secp256r1_ecdsa_signature_from_der(SECP256R1_ECDSA_SIGNATURE *sig, const uin
return -1;
}
if (secp256r1_from_32bytes(sig->r, r) != 1
|| secp256r1_from_32bytes(sig->s, s) != 1) {
memcpy(rbuf + sizeof(rbuf) - rlen, r, rlen);
memcpy(sbuf + sizeof(sbuf) - slen, s, slen);
if (secp256r1_from_32bytes(sig->r, rbuf) != 1
|| secp256r1_from_32bytes(sig->s, sbuf) != 1) {
error_print();
return -1;
}