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wc_ecc_rs_to_sig: check r,s for zero before StoreECC_DSA_Sig()

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This commit is contained in:
Chris Conlon
2020-11-19 14:35:35 -07:00
parent fa08930921
commit f8fd3f8bc1
1 changed files with 4 additions and 4 deletions
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8
wolfcrypt/src/ecc.c
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@ -8003,15 +8003,15 @@ int wc_ecc_rs_to_sig(const char* r, const char* s, byte* out, word32* outlen)
if (err == MP_OKAY)
err = mp_read_radix(stmp, s, MP_RADIX_HEX);
/* convert mp_ints to ECDSA sig, initializes rtmp and stmp internally */
if (err == MP_OKAY)
err = StoreECC_DSA_Sig(out, outlen, rtmp, stmp);
if (err == MP_OKAY) {
if (mp_iszero(rtmp) == MP_YES || mp_iszero(stmp) == MP_YES)
err = MP_ZERO_E;
}
/* convert mp_ints to ECDSA sig, initializes rtmp and stmp internally */
if (err == MP_OKAY)
err = StoreECC_DSA_Sig(out, outlen, rtmp, stmp);
mp_clear(rtmp);
mp_clear(stmp);
#ifdef WOLFSSL_SMALL_STACK