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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#ifndef OPENSSL_NO_DES
# include <openssl/evp.h>
# include <openssl/objects.h>
# include "crypto/evp.h"
# include <openssl/des.h>
static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
typedef struct {
DES_key_schedule ks; /* key schedule */
DES_cblock inw;
DES_cblock outw;
} DESX_CBC_KEY;
# define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
static const EVP_CIPHER d_xcbc_cipher = {
NID_desx_cbc,
8, 24, 8,
EVP_CIPH_CBC_MODE,
desx_cbc_init_key,
desx_cbc_cipher,
NULL,
sizeof(DESX_CBC_KEY),
EVP_CIPHER_set_asn1_iv,
EVP_CIPHER_get_asn1_iv,
NULL,
NULL
};
const EVP_CIPHER *EVP_desx_cbc(void)
{
return &d_xcbc_cipher;
}
static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
DES_cblock *deskey = (DES_cblock *)key;
DES_set_key_unchecked(deskey, &data(ctx)->ks);
memcpy(&data(ctx)->inw[0], &key[8], 8);
memcpy(&data(ctx)->outw[0], &key[16], 8);
return 1;
}
static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
while (inl >= EVP_MAXCHUNK) {
DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
(DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
&data(ctx)->inw, &data(ctx)->outw,
EVP_CIPHER_CTX_encrypting(ctx));
inl -= EVP_MAXCHUNK;
in += EVP_MAXCHUNK;
out += EVP_MAXCHUNK;
}
if (inl)
DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
(DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
&data(ctx)->inw, &data(ctx)->outw,
EVP_CIPHER_CTX_encrypting(ctx));
return 1;
}
#endif
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