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68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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#ifdef LTC_MDSA
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/**
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Import DSA's p, q & g from dsaparam
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dsaparam data: openssl dsaparam -outform DER -out dsaparam.der 2048
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@param dsaparam The DSA param DER encoded data
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@param dsaparamlen The length of dhparam data
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@param key [out] the destination for the imported key
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@return CRYPT_OK if successful.
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*/
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int dsa_set_pqg_dsaparam(const unsigned char *dsaparam, unsigned long dsaparamlen,
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dsa_key *key)
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{
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int err, stat;
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LTC_ARGCHK(dsaparam != NULL);
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(ltc_mp.name != NULL);
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/* init key */
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err = mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
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if (err != CRYPT_OK) return err;
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if ((err = der_decode_sequence_multi(dsaparam, dsaparamlen,
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LTC_ASN1_INTEGER, 1UL, key->p,
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LTC_ASN1_INTEGER, 1UL, key->q,
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LTC_ASN1_INTEGER, 1UL, key->g,
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LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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key->qord = mp_unsigned_bin_size(key->q);
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/* quick p, q, g validation, without primality testing */
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if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if (stat == 0) {
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err = CRYPT_INVALID_PACKET;
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goto LBL_ERR;
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}
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return CRYPT_OK;
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LBL_ERR:
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dsa_free(key);
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return err;
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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