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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://libtom.org
*/
#include "tomcrypt.h"
#include <ncr-int.h>
/**
@file rsa_export.c
Export RSA LTC_PKCS keys, Tom St Denis
*/
#ifdef LTC_MRSA
/**
This will export either an RSAPublicKey or RSAPrivateKey [defined in LTC_PKCS #1 v2.1]
@param out [out] Destination of the packet
@param outlen [in/out] The max size and resulting size of the packet
@param type The type of exported key (PK_PRIVATE or PK_PUBLIC)
@param key The RSA key to export
@return CRYPT_OK if successful
*/
int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key)
{
unsigned long zero=0;
int err;
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
LTC_ARGCHK(key != NULL);
/* type valid? */
if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) {
return CRYPT_PK_INVALID_TYPE;
}
if (type == PK_PRIVATE) {
/* private key */
/* output is
Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p
*/
return der_encode_sequence_multi(out, outlen,
LTC_ASN1_SHORT_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);
} else {
unsigned long tmplen = (mp_count_bits(&key->N)/8)*2+8;
unsigned char* tmp = XMALLOC(tmplen);
if (tmp == NULL) {
return CRYPT_MEM;
}
err = der_encode_sequence_multi(tmp, &tmplen,
LTC_ASN1_INTEGER, 1UL, &key->N,
LTC_ASN1_INTEGER, 1UL, &key->e,
LTC_ASN1_EOL, 0UL, NULL);
if (err != CRYPT_OK) {
goto error;
}
err = der_encode_subject_public_key_info(out, outlen,
PKA_RSA, tmp, tmplen, LTC_ASN1_NULL, NULL, 0);
error:
XFREE(tmp);
return err;
}
}
#endif /* LTC_MRSA */
/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_export.c,v $ */
/* $Revision: 1.17 $ */
/* $Date: 2007/05/12 14:32:35 $ */
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