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/* seskey.c - Session key routines
* Copyright (C) 1998-2000, 2002, 2003, 2007, 2008 Free Software Foundation, Inc.
*
* Author: Timo Schulz
*
* This file is part of OpenCDK.
*
* The OpenCDK library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include "opencdk.h"
#include "main.h"
#include "packet.h"
/* We encode the MD in this way:
*
* 0 1 PAD(n bytes) 0 ASN(asnlen bytes) MD(len bytes)
*
* PAD consists of FF bytes.
*/
static cdk_error_t
do_encode_md (byte ** r_frame, size_t * r_flen, const byte * md, int algo,
size_t len, unsigned nbits, const byte * asn, size_t asnlen)
{
byte *frame = NULL;
size_t nframe = (nbits + 7) / 8;
ssize_t i;
size_t n = 0;
if (!asn || !md || !r_frame || !r_flen)
return CDK_Inv_Value;
if (len + asnlen + 4 > nframe)
return CDK_General_Error;
frame = cdk_calloc (1, nframe);
if (!frame)
return CDK_Out_Of_Core;
frame[n++] = 0;
frame[n++] = 1;
i = nframe - len - asnlen - 3;
if (i < 0)
{
cdk_free (frame);
return CDK_Inv_Value;
}
memset (frame + n, 0xFF, i);
n += i;
frame[n++] = 0;
memcpy (frame + n, asn, asnlen);
n += asnlen;
memcpy (frame + n, md, len);
n += len;
if (n != nframe)
{
cdk_free (frame);
return CDK_Inv_Value;
}
*r_frame = frame;
*r_flen = n;
return 0;
}
static const byte md5_asn[18] = /* Object ID is 1.2.840.113549.2.5 */
{ 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86, 0x48,
0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10
};
static const byte sha1_asn[15] = /* Object ID is 1.3.14.3.2.26 */
{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03,
0x02, 0x1a, 0x05, 0x00, 0x04, 0x14
};
static const byte sha224_asn[19] = /* Object ID is 2.16.840.1.101.3.4.2.4 */
{ 0x30, 0x2D, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48,
0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05, 0x00, 0x04,
0x1C
};
static const byte sha256_asn[19] = /* Object ID is 2.16.840.1.101.3.4.2.1 */
{ 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
0x00, 0x04, 0x20
};
static const byte sha512_asn[] = /* Object ID is 2.16.840.1.101.3.4.2.3 */
{
0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05,
0x00, 0x04, 0x40
};
static const byte sha384_asn[] = /* Object ID is 2.16.840.1.101.3.4.2.2 */
{
0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05,
0x00, 0x04, 0x30
};
static const byte rmd160_asn[15] = /* Object ID is 1.3.36.3.2.1 */
{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x24, 0x03,
0x02, 0x01, 0x05, 0x00, 0x04, 0x14
};
static int
_gnutls_get_digest_oid (gnutls_digest_algorithm_t algo, const byte ** data)
{
switch (algo)
{
case GNUTLS_DIG_MD5:
*data = md5_asn;
return sizeof (md5_asn);
case GNUTLS_DIG_SHA1:
*data = sha1_asn;
return sizeof (sha1_asn);
case GNUTLS_DIG_RMD160:
*data = rmd160_asn;
return sizeof (rmd160_asn);
case GNUTLS_DIG_SHA256:
*data = sha256_asn;
return sizeof (sha256_asn);
case GNUTLS_DIG_SHA384:
*data = sha384_asn;
return sizeof (sha384_asn);
case GNUTLS_DIG_SHA512:
*data = sha512_asn;
return sizeof (sha512_asn);
case GNUTLS_DIG_SHA224:
*data = sha224_asn;
return sizeof (sha224_asn);
default:
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
}
/* Encode the given digest into a pkcs#1 compatible format. */
cdk_error_t
_cdk_digest_encode_pkcs1 (byte ** r_md, size_t * r_mdlen, int pk_algo,
const byte * md, int digest_algo, unsigned nbits)
{
size_t dlen;
if (!md || !r_md || !r_mdlen)
return CDK_Inv_Value;
dlen = _gnutls_hash_get_algo_len (digest_algo);
if (dlen <= 0)
return CDK_Inv_Algo;
if (is_DSA (pk_algo))
{ /* DSS does not use a special encoding. */
*r_md = cdk_malloc (dlen + 1);
if (!*r_md)
return CDK_Out_Of_Core;
*r_mdlen = dlen;
memcpy (*r_md, md, dlen);
return 0;
}
else
{
const byte *asn;
int asnlen;
cdk_error_t rc;
asnlen = _gnutls_get_digest_oid (digest_algo, &asn);
if (asnlen < 0)
return asnlen;
rc = do_encode_md (r_md, r_mdlen, md, digest_algo, dlen,
nbits, asn, asnlen);
return rc;
}
return 0;
}
/**
* cdk_s2k_new:
* @ret_s2k: output for the new S2K object
* @mode: the S2K mode (simple, salted, iter+salted)
* @digest_algo: the hash algorithm
* @salt: random salt
*
* Create a new S2K object with the given parameter.
* The @salt parameter must be always 8 octets.
**/
cdk_error_t
cdk_s2k_new (cdk_s2k_t * ret_s2k, int mode, int digest_algo,
const byte * salt)
{
cdk_s2k_t s2k;
if (!ret_s2k)
return CDK_Inv_Value;
if (mode != 0x00 && mode != 0x01 && mode != 0x03)
return CDK_Inv_Mode;
if (_gnutls_hash_get_algo_len (digest_algo) <= 0)
return CDK_Inv_Algo;
s2k = cdk_calloc (1, sizeof *s2k);
if (!s2k)
return CDK_Out_Of_Core;
s2k->mode = mode;
s2k->hash_algo = digest_algo;
if (salt)
memcpy (s2k->salt, salt, 8);
*ret_s2k = s2k;
return 0;
}
/**
* cdk_s2k_free:
* @s2k: the S2K object
*
* Release the given S2K object.
**/
void
cdk_s2k_free (cdk_s2k_t s2k)
{
cdk_free (s2k);
}
/* Make a copy of the source s2k into R_DST. */
cdk_error_t
_cdk_s2k_copy (cdk_s2k_t * r_dst, cdk_s2k_t src)
{
cdk_s2k_t dst;
cdk_error_t err;
err = cdk_s2k_new (&dst, src->mode, src->hash_algo, src->salt);
if (err)
return err;
dst->count = src->count;
*r_dst = dst;
return 0;
}
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