providers/default/ciphers/cipher_desx_hw.c

   1 /*
   2  * Copyright 1995-2019 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 #include <openssl/des.h>
  11 #include "cipher_tdes_default.h"
  12
  13 /*
  14  * Note the PROV_TDES_CTX has been used for the DESX cipher, just to reduce
  15  * code size.
  16  */
  17 #define ks1 tks.ks[0]
  18 #define ks2 tks.ks[1].ks[0].cblock
  19 #define ks3 tks.ks[2].ks[0].cblock
  20
  21 static int cipher_hw_desx_cbc_initkey(PROV_CIPHER_CTX *ctx,
  22                                       const unsigned char *key, size_t keylen)
  23 {
  24     PROV_TDES_CTX *tctx = (PROV_TDES_CTX *)ctx;
  25     DES_cblock *deskey = (DES_cblock *)key;
  26
  27     DES_set_key_unchecked(deskey, &tctx->ks1);
  28     memcpy(&tctx->ks2, &key[8], 8);
  29     memcpy(&tctx->ks3, &key[16], 8);
  30
  31     return 1;
  32 }
  33
  34 static int cipher_hw_desx_cbc(PROV_CIPHER_CTX *ctx, unsigned char *out,
  35                               const unsigned char *in, size_t inl)
  36 {
  37     PROV_TDES_CTX *tctx = (PROV_TDES_CTX *)ctx;
  38
  39     while (inl >= MAXCHUNK) {
  40         DES_xcbc_encrypt(in, out, (long)MAXCHUNK, &tctx->ks1,
  41                          (DES_cblock *)ctx->iv, &tctx->ks2, &tctx->ks3,
  42                          ctx->enc);
  43         inl -= MAXCHUNK;
  44         in += MAXCHUNK;
  45         out += MAXCHUNK;
  46     }
  47     if (inl > 0)
  48         DES_xcbc_encrypt(in, out, (long)inl, &tctx->ks1,
  49                          (DES_cblock *)ctx->iv, &tctx->ks2, &tctx->ks3,
  50                          ctx->enc);
  51     return 1;
  52 }
  53
  54 static const PROV_CIPHER_HW desx_cbc =
  55 {
  56     cipher_hw_desx_cbc_initkey,
  57     cipher_hw_desx_cbc
  58 };
  59 const PROV_CIPHER_HW *PROV_CIPHER_HW_tdes_desx_cbc(void)
  60 {
  61     return &desx_cbc;
  62 }