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Fix for Intel QAT handling of sign R when cofactor is not 1. ZD 15017

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This commit is contained in:
David Garske
2022-10-28 15:47:07 -07:00
parent 4766a978cf
commit 1adc06d181
1 changed files with 21 additions and 1 deletions
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22
wolfcrypt/src/ecc.c
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@ -6106,6 +6106,14 @@ static int wc_ecc_sign_hash_async(const byte* in, word32 inlen, byte* out,
key->state = ECC_STATE_SIGN_ENCODE;
if (key->asyncDev.marker == WOLFSSL_ASYNC_MARKER_ECC) {
#if !defined(WOLFSSL_ASYNC_CRYPT_SW) && defined(HAVE_ECC_CDH)
DECLARE_CURVE_SPECS(1);
ALLOC_CURVE_SPECS(1, err);
/* get curve order */
err = wc_ecc_curve_load(key->dp, &curve, ECC_CURVE_FIELD_ORDER);
#endif
#ifdef HAVE_CAVIUM_V
/* Nitrox requires r and s in sep buffer, so split it */
NitroxEccRsSplit(key, &r->raw, &s->raw);
@ -6114,11 +6122,23 @@ static int wc_ecc_sign_hash_async(const byte* in, word32 inlen, byte* out,
/* only do this if not software, since it overwrites result */
wc_bigint_to_mp(&r->raw, r);
wc_bigint_to_mp(&s->raw, s);
/* if using a curve with cofactor != 1 then reduce by mod order */
#ifdef HAVE_ECC_CDH
/* if r is not less than order than reduce */
if (err == 0 && mp_count_bits(r) > mp_count_bits(curve->order)) {
err = mp_mod(r, curve->order, r);
}
wc_ecc_curve_free(curve);
FREE_CURVE_SPECS();
#endif
#endif /* !WOLFSSL_ASYNC_CRYPT_SW */
}
/* encoded with DSA header */
err = StoreECC_DSA_Sig(out, outlen, r, s);
if (err == 0) {
err = StoreECC_DSA_Sig(out, outlen, r, s);
}
/* done with R/S */
mp_clear(r);