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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
#include "tomcrypt.h"
#ifdef LTC_MDSA
/**
Import DSA's p, q & g from dsaparam
dsaparam data: openssl dsaparam -outform DER -out dsaparam.der 2048
@param dsaparam The DSA param DER encoded data
@param dsaparamlen The length of dhparam data
@param key [out] the destination for the imported key
@return CRYPT_OK if successful.
*/
int dsa_set_pqg_dsaparam(const unsigned char *dsaparam, unsigned long dsaparamlen,
dsa_key *key)
{
int err, stat;
LTC_ARGCHK(dsaparam != NULL);
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(ltc_mp.name != NULL);
/* init key */
err = mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
if (err != CRYPT_OK) return err;
if ((err = der_decode_sequence_multi(dsaparam, dsaparamlen,
LTC_ASN1_INTEGER, 1UL, key->p,
LTC_ASN1_INTEGER, 1UL, key->q,
LTC_ASN1_INTEGER, 1UL, key->g,
LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
goto LBL_ERR;
}
key->qord = mp_unsigned_bin_size(key->q);
/* quick p, q, g validation, without primality testing */
if ((err = dsa_int_validate_pqg(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;
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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