62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wconversion"
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#pragma clang diagnostic ignored "-Wshorten-64-to-32"
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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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if ((err = dsa_int_init(key)) != 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 = ltc_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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#pragma clang diagnostic pop
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