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/* crypto/evp/e_des.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include "cryptlib.h"
#ifndef OPENSSL_NO_DES
#include <openssl/evp.h>
#include <openssl/objects.h>
#include "evp_locl.h"
#include <openssl/des.h>
#include <openssl/rand.h>
static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
/* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */
static int
des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
BLOCK_CIPHER_ecb_loop()
DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i),
ctx->cipher_data, ctx->encrypt);
return 1;
}
static int
des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
while (inl >= EVP_MAXCHUNK) {
DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
(DES_cblock *)ctx->iv, &ctx->num);
inl -= EVP_MAXCHUNK;
in += EVP_MAXCHUNK;
out += EVP_MAXCHUNK;
}
if (inl)
DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data,
(DES_cblock *)ctx->iv, &ctx->num);
return 1;
}
static int
des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
while (inl >= EVP_MAXCHUNK) {
DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
(DES_cblock *)ctx->iv, ctx->encrypt);
inl -= EVP_MAXCHUNK;
in += EVP_MAXCHUNK;
out += EVP_MAXCHUNK;
}
if (inl)
DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
(DES_cblock *)ctx->iv, ctx->encrypt);
return 1;
}
static int
des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
while (inl >= EVP_MAXCHUNK) {
DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
(DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
inl -= EVP_MAXCHUNK;
in += EVP_MAXCHUNK;
out += EVP_MAXCHUNK;
}
if (inl)
DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
(DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
return 1;
}
/* Although we have a CFB-r implementation for DES, it doesn't pack the right
way, so wrap it here */
static int
des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
size_t n, chunk = EVP_MAXCHUNK/8;
unsigned char c[1], d[1];
if (inl < chunk)
chunk = inl;
while (inl && inl >= chunk) {
for (n = 0; n < chunk*8; ++n) {
c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
DES_cfb_encrypt(c, d, 1, 1, ctx->cipher_data,
(DES_cblock *)ctx->iv, ctx->encrypt);
out[n / 8] = (out[n / 8] &
~(0x80 >> (unsigned int)(n % 8))) |
((d[0] & 0x80) >> (unsigned int)(n % 8));
}
inl -= chunk;
in += chunk;
out += chunk;
if (inl < chunk)
chunk = inl;
}
return 1;
}
static int
des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
while (inl >= EVP_MAXCHUNK) {
DES_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK,
ctx->cipher_data, (DES_cblock *)ctx->iv, ctx->encrypt);
inl -= EVP_MAXCHUNK;
in += EVP_MAXCHUNK;
out += EVP_MAXCHUNK;
}
if (inl)
DES_cfb_encrypt(in, out, 8, (long)inl, ctx->cipher_data,
(DES_cblock *)ctx->iv, ctx->encrypt);
return 1;
}
BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
EVP_CIPH_RAND_KEY, des_init_key, NULL,
EVP_CIPHER_set_asn1_iv,
EVP_CIPHER_get_asn1_iv,
des_ctrl)
BLOCK_CIPHER_def_cfb(des, DES_key_schedule, NID_des, 8, 8, 1,
EVP_CIPH_RAND_KEY, des_init_key, NULL,
EVP_CIPHER_set_asn1_iv,
EVP_CIPHER_get_asn1_iv, des_ctrl)
BLOCK_CIPHER_def_cfb(des, DES_key_schedule, NID_des, 8, 8, 8,
EVP_CIPH_RAND_KEY, des_init_key, NULL,
EVP_CIPHER_set_asn1_iv,
EVP_CIPHER_get_asn1_iv, des_ctrl)
static int
des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
DES_cblock *deskey = (DES_cblock *)key;
#ifdef EVP_CHECK_DES_KEY
if (DES_set_key_checked(deskey, ctx->cipher_data) != 0)
return 0;
#else
DES_set_key_unchecked(deskey, ctx->cipher_data);
#endif
return 1;
}
static int
des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
switch (type) {
case EVP_CTRL_RAND_KEY:
if (RAND_bytes(ptr, 8) <= 0)
return 0;
DES_set_odd_parity((DES_cblock *)ptr);
return 1;
default:
return -1;
}
}
#endif
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