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