70 lines
1.8 KiB
C
70 lines
1.8 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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/* import an RSAPublicKey or RSAPrivateKey [two-prime only, defined in PKCS #1 v2.1] */
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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;
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int err;
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_ARGCHK(in != NULL);
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_ARGCHK(key != NULL);
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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->p, &key->q, NULL)) != MP_OKAY) {
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return mpi_to_ltc_error(err);
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}
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/* read first number, it's either N or 0 [0 == private key] */
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x = inlen;
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if ((err = der_get_multi_integer(in, &x, &key->N, NULL)) != CRYPT_OK) {
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goto __ERR;
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}
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/* advance */
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inlen -= x;
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in += x;
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if (mp_cmp_d(&key->N, 0) == MP_EQ) {
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/* it's a private key */
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if ((err = der_get_multi_integer(in, &inlen, &key->N, &key->e,
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&key->d, &key->p, &key->q, &key->dP,
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&key->dQ, &key->qP, NULL)) != CRYPT_OK) {
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goto __ERR;
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}
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key->type = PK_PRIVATE;
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} else {
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/* it's a public key and we lack e */
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if ((err = der_get_multi_integer(in, &inlen, &key->e, NULL)) != CRYPT_OK) {
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goto __ERR;
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}
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/* free up some ram */
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mp_clear_multi(&key->p, &key->q, &key->qP, &key->dP, &key->dQ, NULL);
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key->type = PK_PUBLIC;
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}
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return CRYPT_OK;
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__ERR:
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mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP,
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&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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