crypto/evp/e_xcbc_d.c

   1 /*
   2  * Copyright 1995-2020 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 # include "evp_local.h"
  26
  27 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  28                              const unsigned char *iv, int enc);
  29 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  30                            const unsigned char *in, size_t inl);
  31
  32 typedef struct {
  33     DES_key_schedule ks;        /* key schedule */
  34     DES_cblock inw;
  35     DES_cblock outw;
  36 } DESX_CBC_KEY;
  37
  38 # define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
  39
  40 static const EVP_CIPHER d_xcbc_cipher = {
  41     NID_desx_cbc,
  42     8, 24, 8,
  43     EVP_CIPH_CBC_MODE,
  44     desx_cbc_init_key,
  45     desx_cbc_cipher,
  46     NULL,
  47     sizeof(DESX_CBC_KEY),
  48     EVP_CIPHER_set_asn1_iv,
  49     EVP_CIPHER_get_asn1_iv,
  50     NULL,
  51     NULL
  52 };
  53
  54 const EVP_CIPHER *EVP_desx_cbc(void)
  55 {
  56     return &d_xcbc_cipher;
  57 }
  58
  59 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  60                              const unsigned char *iv, int enc)
  61 {
  62     DES_cblock *deskey = (DES_cblock *)key;
  63
  64     DES_set_key_unchecked(deskey, &data(ctx)->ks);
  65     memcpy(&data(ctx)->inw[0], &key[8], 8);
  66     memcpy(&data(ctx)->outw[0], &key[16], 8);
  67
  68     return 1;
  69 }
  70
  71 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  72                            const unsigned char *in, size_t inl)
  73 {
  74     while (inl >= EVP_MAXCHUNK) {
  75         DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
  76                          (DES_cblock *)ctx->iv,
  77                          &data(ctx)->inw, &data(ctx)->outw,
  78                          EVP_CIPHER_CTX_encrypting(ctx));
  79         inl -= EVP_MAXCHUNK;
  80         in += EVP_MAXCHUNK;
  81         out += EVP_MAXCHUNK;
  82     }
  83     if (inl)
  84         DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
  85                          (DES_cblock *)ctx->iv,
  86                          &data(ctx)->inw, &data(ctx)->outw,
  87                          EVP_CIPHER_CTX_encrypting(ctx));
  88     return 1;
  89 }
  90 #endif