82 lines
2.2 KiB
C
82 lines
2.2 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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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "mycrypt.h"
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#ifdef MRSA
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int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key)
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{
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unsigned long x, y;
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int err;
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_ARGCHK(in != NULL);
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_ARGCHK(key != NULL);
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/* check length */
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if (inlen < (1+PACKET_SIZE)) {
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return CRYPT_INVALID_PACKET;
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}
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/* test packet header */
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if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_RSA, PACKET_SUB_KEY)) != CRYPT_OK) {
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return err;
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}
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/* init key */
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if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP,
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&key->pQ, &key->p, &key->q, NULL)) != MP_OKAY) {
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return mpi_to_ltc_error(err);
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}
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/* get key type */
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y = PACKET_SIZE;
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key->type = (int)in[y++];
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/* load the modulus */
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INPUT_BIGNUM(&key->N, in, x, y, inlen);
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/* load public exponent */
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INPUT_BIGNUM(&key->e, in, x, y, inlen);
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/* get private exponent */
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if (key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) {
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INPUT_BIGNUM(&key->d, in, x, y, inlen);
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}
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/* get CRT private data if required */
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if (key->type == PK_PRIVATE_OPTIMIZED) {
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INPUT_BIGNUM(&key->dQ, in, x, y, inlen);
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INPUT_BIGNUM(&key->dP, in, x, y, inlen);
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INPUT_BIGNUM(&key->pQ, in, x, y, inlen);
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INPUT_BIGNUM(&key->qP, in, x, y, inlen);
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INPUT_BIGNUM(&key->p, in, x, y, inlen);
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INPUT_BIGNUM(&key->q, in, x, y, inlen);
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}
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/* free up ram not required */
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if (key->type != PK_PRIVATE_OPTIMIZED) {
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mp_clear_multi(&key->dQ, &key->dP, &key->pQ, &key->qP, &key->p, &key->q, NULL);
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}
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if (key->type != PK_PRIVATE && key->type != PK_PRIVATE_OPTIMIZED) {
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mp_clear(&key->d);
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}
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return CRYPT_OK;
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error:
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mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP,
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&key->pQ, &key->qP, &key->p, &key->q, NULL);
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return err;
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}
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#endif /* MRSA */
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