| 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 <stdio.h>
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| 11 | #include <openssl/rc5.h>
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| 12 | #include "rc5_locl.h"
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| 13 |
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| 14 | void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,
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| 15 | long length, RC5_32_KEY *ks, unsigned char *iv,
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| 16 | int encrypt)
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| 17 | {
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| 18 | register unsigned long tin0, tin1;
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| 19 | register unsigned long tout0, tout1, xor0, xor1;
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| 20 | register long l = length;
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| 21 | unsigned long tin[2];
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| 22 |
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| 23 | if (encrypt) {
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| 24 | c2l(iv, tout0);
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| 25 | c2l(iv, tout1);
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| 26 | iv -= 8;
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| 27 | for (l -= 8; l >= 0; l -= 8) {
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| 28 | c2l(in, tin0);
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| 29 | c2l(in, tin1);
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| 30 | tin0 ^= tout0;
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| 31 | tin1 ^= tout1;
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| 32 | tin[0] = tin0;
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| 33 | tin[1] = tin1;
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| 34 | RC5_32_encrypt(tin, ks);
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| 35 | tout0 = tin[0];
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| 36 | l2c(tout0, out);
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| 37 | tout1 = tin[1];
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| 38 | l2c(tout1, out);
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| 39 | }
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| 40 | if (l != -8) {
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| 41 | c2ln(in, tin0, tin1, l + 8);
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| 42 | tin0 ^= tout0;
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| 43 | tin1 ^= tout1;
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| 44 | tin[0] = tin0;
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| 45 | tin[1] = tin1;
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| 46 | RC5_32_encrypt(tin, ks);
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| 47 | tout0 = tin[0];
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| 48 | l2c(tout0, out);
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| 49 | tout1 = tin[1];
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| 50 | l2c(tout1, out);
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| 51 | }
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| 52 | l2c(tout0, iv);
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| 53 | l2c(tout1, iv);
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| 54 | } else {
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| 55 | c2l(iv, xor0);
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| 56 | c2l(iv, xor1);
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| 57 | iv -= 8;
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| 58 | for (l -= 8; l >= 0; l -= 8) {
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| 59 | c2l(in, tin0);
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| 60 | tin[0] = tin0;
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| 61 | c2l(in, tin1);
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| 62 | tin[1] = tin1;
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| 63 | RC5_32_decrypt(tin, ks);
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| 64 | tout0 = tin[0] ^ xor0;
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| 65 | tout1 = tin[1] ^ xor1;
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| 66 | l2c(tout0, out);
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| 67 | l2c(tout1, out);
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| 68 | xor0 = tin0;
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| 69 | xor1 = tin1;
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| 70 | }
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| 71 | if (l != -8) {
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| 72 | c2l(in, tin0);
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| 73 | tin[0] = tin0;
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| 74 | c2l(in, tin1);
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| 75 | tin[1] = tin1;
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| 76 | RC5_32_decrypt(tin, ks);
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| 77 | tout0 = tin[0] ^ xor0;
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| 78 | tout1 = tin[1] ^ xor1;
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| 79 | l2cn(tout0, tout1, out, l + 8);
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| 80 | xor0 = tin0;
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| 81 | xor1 = tin1;
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| 82 | }
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| 83 | l2c(xor0, iv);
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| 84 | l2c(xor1, iv);
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| 85 | }
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| 86 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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| 87 | tin[0] = tin[1] = 0;
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| 88 | }
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| 89 |
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| 90 | void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key)
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| 91 | {
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| 92 | RC5_32_INT a, b, *s;
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| 93 |
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| 94 | s = key->data;
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| 95 |
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| 96 | a = d[0] + s[0];
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| 97 | b = d[1] + s[1];
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| 98 | E_RC5_32(a, b, s, 2);
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| 99 | E_RC5_32(a, b, s, 4);
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| 100 | E_RC5_32(a, b, s, 6);
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| 101 | E_RC5_32(a, b, s, 8);
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| 102 | E_RC5_32(a, b, s, 10);
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| 103 | E_RC5_32(a, b, s, 12);
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| 104 | E_RC5_32(a, b, s, 14);
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| 105 | E_RC5_32(a, b, s, 16);
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| 106 | if (key->rounds == 12) {
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| 107 | E_RC5_32(a, b, s, 18);
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| 108 | E_RC5_32(a, b, s, 20);
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| 109 | E_RC5_32(a, b, s, 22);
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| 110 | E_RC5_32(a, b, s, 24);
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| 111 | } else if (key->rounds == 16) {
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| 112 | /* Do a full expansion to avoid a jump */
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| 113 | E_RC5_32(a, b, s, 18);
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| 114 | E_RC5_32(a, b, s, 20);
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| 115 | E_RC5_32(a, b, s, 22);
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| 116 | E_RC5_32(a, b, s, 24);
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| 117 | E_RC5_32(a, b, s, 26);
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| 118 | E_RC5_32(a, b, s, 28);
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| 119 | E_RC5_32(a, b, s, 30);
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| 120 | E_RC5_32(a, b, s, 32);
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| 121 | }
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| 122 | d[0] = a;
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| 123 | d[1] = b;
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| 124 | }
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| 125 |
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| 126 | void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key)
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| 127 | {
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| 128 | RC5_32_INT a, b, *s;
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| 129 |
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| 130 | s = key->data;
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| 131 |
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| 132 | a = d[0];
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| 133 | b = d[1];
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| 134 | if (key->rounds == 16) {
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| 135 | D_RC5_32(a, b, s, 32);
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| 136 | D_RC5_32(a, b, s, 30);
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| 137 | D_RC5_32(a, b, s, 28);
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| 138 | D_RC5_32(a, b, s, 26);
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| 139 | /* Do a full expansion to avoid a jump */
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| 140 | D_RC5_32(a, b, s, 24);
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| 141 | D_RC5_32(a, b, s, 22);
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| 142 | D_RC5_32(a, b, s, 20);
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| 143 | D_RC5_32(a, b, s, 18);
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| 144 | } else if (key->rounds == 12) {
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| 145 | D_RC5_32(a, b, s, 24);
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| 146 | D_RC5_32(a, b, s, 22);
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| 147 | D_RC5_32(a, b, s, 20);
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| 148 | D_RC5_32(a, b, s, 18);
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| 149 | }
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| 150 | D_RC5_32(a, b, s, 16);
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| 151 | D_RC5_32(a, b, s, 14);
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| 152 | D_RC5_32(a, b, s, 12);
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| 153 | D_RC5_32(a, b, s, 10);
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| 154 | D_RC5_32(a, b, s, 8);
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| 155 | D_RC5_32(a, b, s, 6);
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| 156 | D_RC5_32(a, b, s, 4);
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| 157 | D_RC5_32(a, b, s, 2);
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| 158 | d[0] = a - s[0];
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| 159 | d[1] = b - s[1];
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| 160 | }
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