| 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/cast.h>
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| 11 | #include "cast_local.h"
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| 12 |
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| 13 | void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
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| 14 | {
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| 15 | CAST_LONG l, r, t;
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| 16 | const CAST_LONG *k;
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| 17 |
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| 18 | k = &(key->data[0]);
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| 19 | l = data[0];
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| 20 | r = data[1];
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| 21 |
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| 22 | E_CAST(0, k, l, r, +, ^, -);
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| 23 | E_CAST(1, k, r, l, ^, -, +);
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| 24 | E_CAST(2, k, l, r, -, +, ^);
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| 25 | E_CAST(3, k, r, l, +, ^, -);
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| 26 | E_CAST(4, k, l, r, ^, -, +);
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| 27 | E_CAST(5, k, r, l, -, +, ^);
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| 28 | E_CAST(6, k, l, r, +, ^, -);
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| 29 | E_CAST(7, k, r, l, ^, -, +);
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| 30 | E_CAST(8, k, l, r, -, +, ^);
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| 31 | E_CAST(9, k, r, l, +, ^, -);
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| 32 | E_CAST(10, k, l, r, ^, -, +);
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| 33 | E_CAST(11, k, r, l, -, +, ^);
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| 34 | if (!key->short_key) {
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| 35 | E_CAST(12, k, l, r, +, ^, -);
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| 36 | E_CAST(13, k, r, l, ^, -, +);
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| 37 | E_CAST(14, k, l, r, -, +, ^);
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| 38 | E_CAST(15, k, r, l, +, ^, -);
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| 39 | }
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| 40 |
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| 41 | data[1] = l & 0xffffffffL;
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| 42 | data[0] = r & 0xffffffffL;
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| 43 | }
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| 44 |
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| 45 | void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
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| 46 | {
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| 47 | CAST_LONG l, r, t;
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| 48 | const CAST_LONG *k;
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| 49 |
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| 50 | k = &(key->data[0]);
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| 51 | l = data[0];
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| 52 | r = data[1];
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| 53 |
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| 54 | if (!key->short_key) {
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| 55 | E_CAST(15, k, l, r, +, ^, -);
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| 56 | E_CAST(14, k, r, l, -, +, ^);
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| 57 | E_CAST(13, k, l, r, ^, -, +);
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| 58 | E_CAST(12, k, r, l, +, ^, -);
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| 59 | }
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| 60 | E_CAST(11, k, l, r, -, +, ^);
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| 61 | E_CAST(10, k, r, l, ^, -, +);
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| 62 | E_CAST(9, k, l, r, +, ^, -);
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| 63 | E_CAST(8, k, r, l, -, +, ^);
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| 64 | E_CAST(7, k, l, r, ^, -, +);
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| 65 | E_CAST(6, k, r, l, +, ^, -);
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| 66 | E_CAST(5, k, l, r, -, +, ^);
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| 67 | E_CAST(4, k, r, l, ^, -, +);
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| 68 | E_CAST(3, k, l, r, +, ^, -);
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| 69 | E_CAST(2, k, r, l, -, +, ^);
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| 70 | E_CAST(1, k, l, r, ^, -, +);
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| 71 | E_CAST(0, k, r, l, +, ^, -);
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| 72 |
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| 73 | data[1] = l & 0xffffffffL;
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| 74 | data[0] = r & 0xffffffffL;
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| 75 | }
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| 76 |
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| 77 | void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out,
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| 78 | long length, const CAST_KEY *ks, unsigned char *iv,
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| 79 | int enc)
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| 80 | {
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| 81 | register CAST_LONG tin0, tin1;
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| 82 | register CAST_LONG tout0, tout1, xor0, xor1;
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| 83 | register long l = length;
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| 84 | CAST_LONG tin[2];
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| 85 |
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| 86 | if (enc) {
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| 87 | n2l(iv, tout0);
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| 88 | n2l(iv, tout1);
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| 89 | iv -= 8;
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| 90 | for (l -= 8; l >= 0; l -= 8) {
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| 91 | n2l(in, tin0);
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| 92 | n2l(in, tin1);
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| 93 | tin0 ^= tout0;
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| 94 | tin1 ^= tout1;
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| 95 | tin[0] = tin0;
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| 96 | tin[1] = tin1;
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| 97 | CAST_encrypt(tin, ks);
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| 98 | tout0 = tin[0];
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| 99 | tout1 = tin[1];
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| 100 | l2n(tout0, out);
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| 101 | l2n(tout1, out);
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| 102 | }
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| 103 | if (l != -8) {
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| 104 | n2ln(in, tin0, tin1, l + 8);
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| 105 | tin0 ^= tout0;
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| 106 | tin1 ^= tout1;
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| 107 | tin[0] = tin0;
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| 108 | tin[1] = tin1;
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| 109 | CAST_encrypt(tin, ks);
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| 110 | tout0 = tin[0];
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| 111 | tout1 = tin[1];
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| 112 | l2n(tout0, out);
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| 113 | l2n(tout1, out);
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| 114 | }
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| 115 | l2n(tout0, iv);
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| 116 | l2n(tout1, iv);
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| 117 | } else {
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| 118 | n2l(iv, xor0);
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| 119 | n2l(iv, xor1);
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| 120 | iv -= 8;
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| 121 | for (l -= 8; l >= 0; l -= 8) {
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| 122 | n2l(in, tin0);
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| 123 | n2l(in, tin1);
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| 124 | tin[0] = tin0;
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| 125 | tin[1] = tin1;
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| 126 | CAST_decrypt(tin, ks);
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| 127 | tout0 = tin[0] ^ xor0;
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| 128 | tout1 = tin[1] ^ xor1;
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| 129 | l2n(tout0, out);
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| 130 | l2n(tout1, out);
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| 131 | xor0 = tin0;
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| 132 | xor1 = tin1;
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| 133 | }
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| 134 | if (l != -8) {
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| 135 | n2l(in, tin0);
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| 136 | n2l(in, tin1);
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| 137 | tin[0] = tin0;
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| 138 | tin[1] = tin1;
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| 139 | CAST_decrypt(tin, ks);
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| 140 | tout0 = tin[0] ^ xor0;
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| 141 | tout1 = tin[1] ^ xor1;
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| 142 | l2nn(tout0, tout1, out, l + 8);
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| 143 | xor0 = tin0;
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| 144 | xor1 = tin1;
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| 145 | }
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| 146 | l2n(xor0, iv);
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| 147 | l2n(xor1, iv);
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| 148 | }
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| 149 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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| 150 | tin[0] = tin[1] = 0;
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| 151 | }
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