| 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/idea.h>
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| 11 | #include "idea_local.h"
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| 12 |
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| 13 | void IDEA_cbc_encrypt(const unsigned char *in, unsigned char *out,
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| 14 | long length, IDEA_KEY_SCHEDULE *ks, unsigned char *iv,
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| 15 | int encrypt)
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| 16 | {
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| 17 | register unsigned long tin0, tin1;
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| 18 | register unsigned long tout0, tout1, xor0, xor1;
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| 19 | register long l = length;
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| 20 | unsigned long tin[2];
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| 21 |
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| 22 | if (encrypt) {
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| 23 | n2l(iv, tout0);
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| 24 | n2l(iv, tout1);
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| 25 | iv -= 8;
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| 26 | for (l -= 8; l >= 0; l -= 8) {
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| 27 | n2l(in, tin0);
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| 28 | n2l(in, tin1);
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| 29 | tin0 ^= tout0;
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| 30 | tin1 ^= tout1;
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| 31 | tin[0] = tin0;
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| 32 | tin[1] = tin1;
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| 33 | IDEA_encrypt(tin, ks);
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| 34 | tout0 = tin[0];
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| 35 | l2n(tout0, out);
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| 36 | tout1 = tin[1];
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| 37 | l2n(tout1, out);
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| 38 | }
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| 39 | if (l != -8) {
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| 40 | n2ln(in, tin0, tin1, l + 8);
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| 41 | tin0 ^= tout0;
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| 42 | tin1 ^= tout1;
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| 43 | tin[0] = tin0;
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| 44 | tin[1] = tin1;
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| 45 | IDEA_encrypt(tin, ks);
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| 46 | tout0 = tin[0];
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| 47 | l2n(tout0, out);
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| 48 | tout1 = tin[1];
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| 49 | l2n(tout1, out);
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| 50 | }
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| 51 | l2n(tout0, iv);
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| 52 | l2n(tout1, iv);
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| 53 | } else {
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| 54 | n2l(iv, xor0);
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| 55 | n2l(iv, xor1);
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| 56 | iv -= 8;
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| 57 | for (l -= 8; l >= 0; l -= 8) {
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| 58 | n2l(in, tin0);
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| 59 | tin[0] = tin0;
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| 60 | n2l(in, tin1);
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| 61 | tin[1] = tin1;
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| 62 | IDEA_encrypt(tin, ks);
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| 63 | tout0 = tin[0] ^ xor0;
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| 64 | tout1 = tin[1] ^ xor1;
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| 65 | l2n(tout0, out);
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| 66 | l2n(tout1, out);
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| 67 | xor0 = tin0;
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| 68 | xor1 = tin1;
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| 69 | }
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| 70 | if (l != -8) {
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| 71 | n2l(in, tin0);
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| 72 | tin[0] = tin0;
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| 73 | n2l(in, tin1);
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| 74 | tin[1] = tin1;
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| 75 | IDEA_encrypt(tin, ks);
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| 76 | tout0 = tin[0] ^ xor0;
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| 77 | tout1 = tin[1] ^ xor1;
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| 78 | l2nn(tout0, tout1, out, l + 8);
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| 79 | xor0 = tin0;
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| 80 | xor1 = tin1;
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| 81 | }
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| 82 | l2n(xor0, iv);
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| 83 | l2n(xor1, iv);
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| 84 | }
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| 85 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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| 86 | tin[0] = tin[1] = 0;
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| 87 | }
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| 88 |
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| 89 | void IDEA_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key)
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| 90 | {
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| 91 | register IDEA_INT *p;
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| 92 | register unsigned long x1, x2, x3, x4, t0, t1, ul;
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| 93 |
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| 94 | x2 = d[0];
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| 95 | x1 = (x2 >> 16);
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| 96 | x4 = d[1];
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| 97 | x3 = (x4 >> 16);
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| 98 |
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| 99 | p = &(key->data[0][0]);
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| 100 |
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| 101 | E_IDEA(0);
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| 102 | E_IDEA(1);
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| 103 | E_IDEA(2);
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| 104 | E_IDEA(3);
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| 105 | E_IDEA(4);
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| 106 | E_IDEA(5);
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| 107 | E_IDEA(6);
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| 108 | E_IDEA(7);
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| 109 |
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| 110 | x1 &= 0xffff;
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| 111 | idea_mul(x1, x1, *p, ul);
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| 112 | p++;
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| 113 |
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| 114 | t0 = x3 + *(p++);
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| 115 | t1 = x2 + *(p++);
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| 116 |
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| 117 | x4 &= 0xffff;
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| 118 | idea_mul(x4, x4, *p, ul);
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| 119 |
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| 120 | d[0] = (t0 & 0xffff) | ((x1 & 0xffff) << 16);
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| 121 | d[1] = (x4 & 0xffff) | ((t1 & 0xffff) << 16);
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| 122 | }
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