crypto/idea/i_cbc.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  * IDEA low level APIs are deprecated for public use, but still ok for internal
  12  * use where we're using them to implement the higher level EVP interface, as is
  13  * the case here.
  14  */
  15 #include "internal/deprecated.h"
  16
  17 #include <openssl/idea.h>
  18 #include "idea_local.h"
  19
  20 void IDEA_cbc_encrypt(const unsigned char *in, unsigned char *out,
  21                       long length, IDEA_KEY_SCHEDULE *ks, unsigned char *iv,
  22                       int encrypt)
  23 {
  24     register unsigned long tin0, tin1;
  25     register unsigned long tout0, tout1, xor0, xor1;
  26     register long l = length;
  27     unsigned long tin[2];
  28
  29     if (encrypt) {
  30         n2l(iv, tout0);
  31         n2l(iv, tout1);
  32         iv -= 8;
  33         for (l -= 8; l >= 0; l -= 8) {
  34             n2l(in, tin0);
  35             n2l(in, tin1);
  36             tin0 ^= tout0;
  37             tin1 ^= tout1;
  38             tin[0] = tin0;
  39             tin[1] = tin1;
  40             IDEA_encrypt(tin, ks);
  41             tout0 = tin[0];
  42             l2n(tout0, out);
  43             tout1 = tin[1];
  44             l2n(tout1, out);
  45         }
  46         if (l != -8) {
  47             n2ln(in, tin0, tin1, l + 8);
  48             tin0 ^= tout0;
  49             tin1 ^= tout1;
  50             tin[0] = tin0;
  51             tin[1] = tin1;
  52             IDEA_encrypt(tin, ks);
  53             tout0 = tin[0];
  54             l2n(tout0, out);
  55             tout1 = tin[1];
  56             l2n(tout1, out);
  57         }
  58         l2n(tout0, iv);
  59         l2n(tout1, iv);
  60     } else {
  61         n2l(iv, xor0);
  62         n2l(iv, xor1);
  63         iv -= 8;
  64         for (l -= 8; l >= 0; l -= 8) {
  65             n2l(in, tin0);
  66             tin[0] = tin0;
  67             n2l(in, tin1);
  68             tin[1] = tin1;
  69             IDEA_encrypt(tin, ks);
  70             tout0 = tin[0] ^ xor0;
  71             tout1 = tin[1] ^ xor1;
  72             l2n(tout0, out);
  73             l2n(tout1, out);
  74             xor0 = tin0;
  75             xor1 = tin1;
  76         }
  77         if (l != -8) {
  78             n2l(in, tin0);
  79             tin[0] = tin0;
  80             n2l(in, tin1);
  81             tin[1] = tin1;
  82             IDEA_encrypt(tin, ks);
  83             tout0 = tin[0] ^ xor0;
  84             tout1 = tin[1] ^ xor1;
  85             l2nn(tout0, tout1, out, l + 8);
  86             xor0 = tin0;
  87             xor1 = tin1;
  88         }
  89         l2n(xor0, iv);
  90         l2n(xor1, iv);
  91     }
  92     tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
  93     tin[0] = tin[1] = 0;
  94 }
  95
  96 void IDEA_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key)
  97 {
  98     register IDEA_INT *p;
  99     register unsigned long x1, x2, x3, x4, t0, t1, ul;
 100
 101     x2 = d[0];
 102     x1 = (x2 >> 16);
 103     x4 = d[1];
 104     x3 = (x4 >> 16);
 105
 106     p = &(key->data[0][0]);
 107
 108     E_IDEA(0);
 109     E_IDEA(1);
 110     E_IDEA(2);
 111     E_IDEA(3);
 112     E_IDEA(4);
 113     E_IDEA(5);
 114     E_IDEA(6);
 115     E_IDEA(7);
 116
 117     x1 &= 0xffff;
 118     idea_mul(x1, x1, *p, ul);
 119     p++;
 120
 121     t0 = x3 + *(p++);
 122     t1 = x2 + *(p++);
 123
 124     x4 &= 0xffff;
 125     idea_mul(x4, x4, *p, ul);
 126
 127     d[0] = (t0 & 0xffff) | ((x1 & 0xffff) << 16);
 128     d[1] = (x4 & 0xffff) | ((t1 & 0xffff) << 16);
 129 }