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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
*/
#include "tomcrypt.h"
/**
@file rsa_import.c
Import a PKCS RSA key, Tom St Denis
*/
#ifdef MRSA
/**
Import an RSAPublicKey or RSAPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1]
@param in The packet to import from
@param inlen It's length (octets)
@param key [out] Destination for newly imported key
@return CRYPT_OK if successful, upon error allocated memory is freed
*/
int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key)
{
int err;
mp_int zero;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(key != NULL);
/* init key */
if ((err = mp_init_multi(&zero, &key->e, &key->d, &key->N, &key->dQ,
&key->dP, &key->qP, &key->p, &key->q, NULL)) != MP_OKAY) {
return mpi_to_ltc_error(err);
}
if ((err = der_decode_sequence_multi(in, inlen,
LTC_ASN1_INTEGER, 1UL, &key->N,
LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
goto LBL_ERR;
}
if (mp_cmp_d(&key->N, 0) == MP_EQ) {
/* it's a private key */
if ((err = der_decode_sequence_multi(in, inlen,
LTC_ASN1_INTEGER, 1UL, &zero,
LTC_ASN1_INTEGER, 1UL, &key->N,
LTC_ASN1_INTEGER, 1UL, &key->e,
LTC_ASN1_INTEGER, 1UL, &key->d,
LTC_ASN1_INTEGER, 1UL, &key->p,
LTC_ASN1_INTEGER, 1UL, &key->q,
LTC_ASN1_INTEGER, 1UL, &key->dP,
LTC_ASN1_INTEGER, 1UL, &key->dQ,
LTC_ASN1_INTEGER, 1UL, &key->qP,
LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
goto LBL_ERR;
}
key->type = PK_PRIVATE;
} else if (mp_cmp_d(&key->N, 1) == MP_EQ) {
/* we don't support multi-prime RSA */
err = CRYPT_PK_INVALID_TYPE;
goto LBL_ERR;
} else {
/* it's a public key and we lack e */
if ((err = der_decode_sequence_multi(in, inlen,
LTC_ASN1_INTEGER, 1UL, &key->N,
LTC_ASN1_INTEGER, 1UL, &key->e,
LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
goto LBL_ERR;
}
/* free up some ram */
mp_clear_multi(&key->p, &key->q, &key->qP, &key->dP, &key->dQ, NULL);
key->type = PK_PUBLIC;
}
return CRYPT_OK;
LBL_ERR:
mp_clear_multi(&zero, &key->d, &key->e, &key->N, &key->dQ, &key->dP,
&key->qP, &key->p, &key->q, NULL);
return err;
}
#endif /* MRSA */
/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_import.c,v $ */
/* $Revision: 1.10 $ */
/* $Date: 2005/06/03 18:48:28 $ */
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