| // SPDX-License-Identifier: BSD-2-Clause |
| /* 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_private.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: $Format:%ai$ */ |