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do dsa_int_validate_* in dsa_import

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This commit is contained in:
Karel Miko 2017-09-14 17:38:12 +02:00
parent fd94e9540f
commit 444d9f3fb7
1 changed files with 15 additions and 4 deletions
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19
src/pk/dsa/dsa_import.c
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@ -24,7 +24,7 @@
*/ */
int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key) int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
{ {
int err; int err, stat;
unsigned long zero = 0; unsigned long zero = 0;
unsigned char* tmpbuf = NULL; unsigned char* tmpbuf = NULL;
unsigned char flags[1]; unsigned char flags[1];
@ -116,10 +116,21 @@ int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
} }
LBL_OK: LBL_OK:
key->qord = mp_unsigned_bin_size(key->q); key->qord = mp_unsigned_bin_size(key->q);
if (key->qord >= LTC_MDSA_MAX_GROUP || key->qord <= 15 || /* quick p, q, g validation, without primality testing */
(unsigned long)key->qord >= mp_unsigned_bin_size(key->p) || (mp_unsigned_bin_size(key->p) - key->qord) >= LTC_MDSA_DELTA) { if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) {
goto LBL_ERR;
}
if (stat == 0) {
err = CRYPT_INVALID_PACKET;
goto LBL_ERR;
}
/* validate x, y */
if ((err = dsa_int_validate_xy(key, &stat)) != CRYPT_OK) {
goto LBL_ERR;
}
if (stat == 0) {
err = CRYPT_INVALID_PACKET; err = CRYPT_INVALID_PACKET;
goto LBL_ERR; goto LBL_ERR;
} }