45 lines
1.2 KiB
C
45 lines
1.2 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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#ifdef LTC_MDH
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/**
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Import DH key parts p and g from dhparam
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dhparam data: openssl dhparam -outform DER -out dhparam.der 2048
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@param dhparam The DH param DER encoded data
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@param dhparamlen The length of dhparam data
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@param key [out] Where the newly created DH key will be stored
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@return CRYPT_OK if successful, note: on error all allocated memory will be freed automatically.
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*/
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int dh_set_pg_dhparam(const unsigned char *dhparam, unsigned long dhparamlen, dh_key *key)
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{
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int err;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(ltc_mp.name != NULL);
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LTC_ARGCHK(dhparam != NULL);
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LTC_ARGCHK(dhparamlen > 0);
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if ((err = dh_init(key)) != CRYPT_OK) {
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return err;
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}
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if ((err = der_decode_sequence_multi(dhparam, dhparamlen,
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LTC_ASN1_INTEGER, 1UL, key->prime,
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LTC_ASN1_INTEGER, 1UL, key->base,
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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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return CRYPT_OK;
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LBL_ERR:
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dh_free(key);
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return err;
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}
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#endif /* LTC_MDH */
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