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Use BN_bn2binpad

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Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
This commit is contained in:
Dr. Stephen Henson 2016-02-03 18:51:02 +00:00
parent d6755bb6ac
commit 907e950068
1 changed files with 2 additions and 12 deletions
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14
crypto/ec/ec_key.c
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@ -551,7 +551,7 @@ int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len)
{
size_t buf_len, bn_len;
size_t buf_len;
if (eckey->group == NULL || eckey->group->meth == NULL)
return 0;
@ -563,23 +563,13 @@ size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len)
else if (len < buf_len)
return 0;
bn_len = (size_t)BN_num_bytes(eckey->priv_key);
/* Octetstring may need leading zeros if BN is to short */
if (bn_len > buf_len) {
if (BN_bn2binpad(eckey->priv_key, buf, buf_len) == -1) {
ECerr(EC_F_EC_KEY_PRIV2OCT, EC_R_BUFFER_TOO_SMALL);
return 0;
}
if (!BN_bn2bin(eckey->priv_key, buf + buf_len - bn_len)) {
ECerr(EC_F_EC_KEY_PRIV2OCT, ERR_R_BN_LIB);
return 0;
}
if (buf_len - bn_len > 0)
memset(buf, 0, buf_len - bn_len);
return buf_len;
}