/**
Import DSA public or private key-part from raw numbers
NB: The p, q & g parts must be set beforehand
@param in The key-part to import, either public or private.
@param inlen The key-part's length
@param type Which type of key (PK_PRIVATE or PK_PUBLIC)
@param key [out] the destination for the imported key
@return CRYPT_OK if successful.
*/
int dsa_set_key(const unsigned char *in, unsigned long inlen, int type, dsa_key *key)
{
int err, stat = 0;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(key->x != NULL);
LTC_ARGCHK(key->y != NULL);
LTC_ARGCHK(key->p != NULL);
LTC_ARGCHK(key->g != NULL);
LTC_ARGCHK(key->q != NULL);
LTC_ARGCHK(ltc_mp.name != NULL);
if (type == PK_PRIVATE) {
key->type = PK_PRIVATE;
if ((err = mp_read_unsigned_bin(key->x, (unsigned char *)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
if ((err = mp_exptmod(key->g, key->x, key->p, key->y)) != CRYPT_OK) { goto LBL_ERR; }
}
else {
key->type = PK_PUBLIC;
if ((err = mp_read_unsigned_bin(key->y, (unsigned char *)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
}
if ((err = dsa_int_validate_xy(key, &stat)) != CRYPT_OK) { goto LBL_ERR; }
if (stat == 0) {
err = CRYPT_INVALID_PACKET;
goto LBL_ERR;
}
return CRYPT_OK;
LBL_ERR:
dsa_free(key);
return err;
}
/**
Validate a DSA key
Yeah, this function should've been called dsa_validate_key()
in the first place and for compat-reasons we keep it
as it was (for now).
@param key The key to validate
@param stat [out] Result of test, 1==valid, 0==invalid
@return CRYPT_OK if successful
*/
int dsa_verify_key(dsa_key *key, int *stat)
{
int err;
err = dsa_int_validate_primes(key, stat);
if (err != CRYPT_OK || *stat == 0) return err;
err = dsa_int_validate_pqg(key, stat);
if (err != CRYPT_OK || *stat == 0) return err;
return dsa_int_validate_xy(key, stat);
}
