58 lines
1.5 KiB
C
58 lines
1.5 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_MECC
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int ecc_set_key(const unsigned char *in, unsigned long inlen, int type, ecc_key *key)
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{
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int err;
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void *prime, *a, *b;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(inlen > 0);
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prime = key->dp.prime;
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a = key->dp.A;
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b = key->dp.B;
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if (type == PK_PRIVATE) {
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/* load private key */
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if ((err = ltc_mp_read_unsigned_bin(key->k, in, inlen)) != CRYPT_OK) {
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goto error;
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}
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if (ltc_mp_iszero(key->k) || (ltc_mp_cmp(key->k, key->dp.order) != LTC_MP_LT)) {
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err = CRYPT_INVALID_PACKET;
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goto error;
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}
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/* compute public key */
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if ((err = ltc_mp.ecc_ptmul(key->k, &key->dp.base, &key->pubkey, a, prime, 1)) != CRYPT_OK) { goto error; }
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}
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else if (type == PK_PUBLIC) {
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/* load public key */
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if ((err = ltc_ecc_import_point(in, inlen, prime, a, b, key->pubkey.x, key->pubkey.y)) != CRYPT_OK) { goto error; }
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if ((err = ltc_mp_set(key->pubkey.z, 1)) != CRYPT_OK) { goto error; }
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}
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else {
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err = CRYPT_INVALID_PACKET;
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goto error;
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}
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/* point on the curve + other checks */
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if ((err = ltc_ecc_verify_key(key)) != CRYPT_OK) {
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goto error;
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}
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key->type = type;
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key->rfc6979_hash_alg = NULL;
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return CRYPT_OK;
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error:
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ecc_free(key);
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return err;
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}
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#endif
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