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Code Issues Releases Wiki Activity

Fix for policy_sign issue when r or s is less than key size (needs zero padding).

pull/311/head
David Garske 2023-11-29 13:05:50 -08:00
parent 18531274da
commit 50137547ed
1 changed files with 8 additions and 4 deletions
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12
examples/pcr/policy_sign.c
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@ -185,12 +185,16 @@ static int PolicySign(TPM_ALG_ID alg, const char* keyFile, const char* password,
rc = wc_ecc_sign_hash_ex(hash, hashSz, &rng, &key.ecc, &r, &s);
}
if (rc == 0) {
word32 keySz = key.ecc.dp->size;
mp_to_unsigned_bin(&r, sig);
mp_to_unsigned_bin(&s, sig + keySz);
word32 keySz = key.ecc.dp->size, rSz, sSz;
*sigSz = keySz * 2;
XMEMSET(sig, 0, *sigSz);
/* export sign r/s - zero pad to key size */
rSz = mp_unsigned_bin_size(&r);
mp_to_unsigned_bin(&r, &sig[keySz - rSz]);
sSz = mp_unsigned_bin_size(&s);
mp_to_unsigned_bin(&s, &sig[keySz + (keySz - sSz)]);
mp_clear(&r);
mp_clear(&s);
*sigSz = keySz * 2;
}
}
wc_ecc_free(&key.ecc);