64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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/* 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;
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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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if (key->qord >= LTC_MDSA_MAX_GROUP || key->qord <= 15 ||
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(unsigned long)key->qord >= mp_unsigned_bin_size(key->p) || (mp_unsigned_bin_size(key->p) - key->qord) >= LTC_MDSA_DELTA) {
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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: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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