crypto/evp/e_xcbc_d.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * DES low level APIs are deprecated for public use, but still ok for internal
  12  * use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <stdio.h>
  17 #include "internal/cryptlib.h"
  18
  19 #ifndef OPENSSL_NO_DES
  20
  21 # include <openssl/evp.h>
  22 # include <openssl/objects.h>
  23 # include "crypto/evp.h"
  24 # include <openssl/des.h>
  25
  26 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  27                              const unsigned char *iv, int enc);
  28 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  29                            const unsigned char *in, size_t inl);
  30
  31 typedef struct {
  32     DES_key_schedule ks;        /* key schedule */
  33     DES_cblock inw;
  34     DES_cblock outw;
  35 } DESX_CBC_KEY;
  36
  37 # define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
  38
  39 static const EVP_CIPHER d_xcbc_cipher = {
  40     NID_desx_cbc,
  41     8, 24, 8,
  42     EVP_CIPH_CBC_MODE,
  43     desx_cbc_init_key,
  44     desx_cbc_cipher,
  45     NULL,
  46     sizeof(DESX_CBC_KEY),
  47     EVP_CIPHER_set_asn1_iv,
  48     EVP_CIPHER_get_asn1_iv,
  49     NULL,
  50     NULL
  51 };
  52
  53 const EVP_CIPHER *EVP_desx_cbc(void)
  54 {
  55     return &d_xcbc_cipher;
  56 }
  57
  58 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  59                              const unsigned char *iv, int enc)
  60 {
  61     DES_cblock *deskey = (DES_cblock *)key;
  62
  63     DES_set_key_unchecked(deskey, &data(ctx)->ks);
  64     memcpy(&data(ctx)->inw[0], &key[8], 8);
  65     memcpy(&data(ctx)->outw[0], &key[16], 8);
  66
  67     return 1;
  68 }
  69
  70 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  71                            const unsigned char *in, size_t inl)
  72 {
  73     while (inl >= EVP_MAXCHUNK) {
  74         DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
  75                          (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
  76                          &data(ctx)->inw, &data(ctx)->outw,
  77                          EVP_CIPHER_CTX_encrypting(ctx));
  78         inl -= EVP_MAXCHUNK;
  79         in += EVP_MAXCHUNK;
  80         out += EVP_MAXCHUNK;
  81     }
  82     if (inl)
  83         DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
  84                          (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
  85                          &data(ctx)->inw, &data(ctx)->outw,
  86                          EVP_CIPHER_CTX_encrypting(ctx));
  87     return 1;
  88 }
  89 #endif