crypto/evp/e_xcbc_d.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12
  13 #ifndef OPENSSL_NO_DES
  14
  15 # include <openssl/evp.h>
  16 # include <openssl/objects.h>
  17 # include "internal/evp_int.h"
  18 # include <openssl/des.h>
  19
  20 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  21                              const unsigned char *iv, int enc);
  22 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  23                            const unsigned char *in, size_t inl);
  24
  25 typedef struct {
  26     DES_key_schedule ks;        /* key schedule */
  27     DES_cblock inw;
  28     DES_cblock outw;
  29 } DESX_CBC_KEY;
  30
  31 # define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
  32
  33 static const EVP_CIPHER d_xcbc_cipher = {
  34     NID_desx_cbc,
  35     8, 24, 8,
  36     EVP_CIPH_CBC_MODE,
  37     desx_cbc_init_key,
  38     desx_cbc_cipher,
  39     NULL,
  40     sizeof(DESX_CBC_KEY),
  41     EVP_CIPHER_set_asn1_iv,
  42     EVP_CIPHER_get_asn1_iv,
  43     NULL,
  44     NULL
  45 };
  46
  47 const EVP_CIPHER *EVP_desx_cbc(void)
  48 {
  49     return (&d_xcbc_cipher);
  50 }
  51
  52 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  53                              const unsigned char *iv, int enc)
  54 {
  55     DES_cblock *deskey = (DES_cblock *)key;
  56
  57     DES_set_key_unchecked(deskey, &data(ctx)->ks);
  58     memcpy(&data(ctx)->inw[0], &key[8], 8);
  59     memcpy(&data(ctx)->outw[0], &key[16], 8);
  60
  61     return 1;
  62 }
  63
  64 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  65                            const unsigned char *in, size_t inl)
  66 {
  67     while (inl >= EVP_MAXCHUNK) {
  68         DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
  69                          (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
  70                          &data(ctx)->inw, &data(ctx)->outw,
  71                          EVP_CIPHER_CTX_encrypting(ctx));
  72         inl -= EVP_MAXCHUNK;
  73         in += EVP_MAXCHUNK;
  74         out += EVP_MAXCHUNK;
  75     }
  76     if (inl)
  77         DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
  78                          (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
  79                          &data(ctx)->inw, &data(ctx)->outw,
  80                          EVP_CIPHER_CTX_encrypting(ctx));
  81     return 1;
  82 }
  83 #endif