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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"
/**
@file dsa_import.c
DSA implementation, import a DSA key, Tom St Denis
*/
#ifdef LTC_MDSA
/**
Import a DSA key
@param in The binary packet to import from
@param inlen The length of the binary packet
@param key [out] Where to store the imported key
@return CRYPT_OK if successful, upon error this function will free all allocated memory
*/
int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
{
int err;
unsigned long zero = 0;
unsigned char* tmpbuf = NULL;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(key != NULL);
/* init key */
if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != CRYPT_OK) {
return CRYPT_MEM;
}
/* get key type */
if ((err = der_decode_sequence_multi(in, inlen,
LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
LTC_ASN1_INTEGER, 1UL, &key->p,
LTC_ASN1_INTEGER, 1UL, &key->q,
LTC_ASN1_INTEGER, 1UL, &key->g,
LTC_ASN1_INTEGER, 1UL, &key->y,
LTC_ASN1_INTEGER, 1UL, &key->x,
LTC_ASN1_EOL, 0UL, NULL)) == CRYPT_OK) {
key->type = PK_PRIVATE;
} else { /* public */
ltc_asn1_list params[3];
unsigned long tmpbuf_len = MAX_RSA_SIZE*8;
LTC_SET_ASN1(params, 0, LTC_ASN1_INTEGER, &key->p, 1UL);
LTC_SET_ASN1(params, 1, LTC_ASN1_INTEGER, &key->q, 1UL);
LTC_SET_ASN1(params, 2, LTC_ASN1_INTEGER, &key->g, 1UL);
tmpbuf = XCALLOC(1, tmpbuf_len);
if (tmpbuf == NULL) {
err = CRYPT_MEM;
goto LBL_ERR;
}
err = der_decode_subject_public_key_info(in, inlen,
PKA_DSA, tmpbuf, &tmpbuf_len,
LTC_ASN1_SEQUENCE, params, 3);
if (err != CRYPT_OK) {
goto LBL_ERR;
}
if ((err=der_decode_integer(tmpbuf, tmpbuf_len, &key->y)) != CRYPT_OK) {
goto LBL_ERR;
}
XFREE(tmpbuf);
key->type = PK_PUBLIC;
}
key->qord = mp_unsigned_bin_size(&key->q);
if (key->qord >= LTC_MDSA_MAX_GROUP || key->qord <= 15 ||
(unsigned long)key->qord >= mp_unsigned_bin_size(&key->p) || (mp_unsigned_bin_size(&key->p) - key->qord) >= LTC_MDSA_DELTA) {
err = CRYPT_INVALID_PACKET;
goto LBL_ERR;
}
return CRYPT_OK;
LBL_ERR:
XFREE(tmpbuf);
mp_clear_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
return err;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_import.c,v $ */
/* $Revision: 1.14 $ */
/* $Date: 2007/05/12 14:32:35 $ */
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