| 1 | /*
|
|---|
| 2 | * Copyright 1995-2020 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 | * CAST low level APIs are deprecated for public use, but still ok for
|
|---|
| 12 | * internal use.
|
|---|
| 13 | */
|
|---|
| 14 | #include "internal/deprecated.h"
|
|---|
| 15 |
|
|---|
| 16 | #include <openssl/cast.h>
|
|---|
| 17 | #include "cast_local.h"
|
|---|
| 18 |
|
|---|
| 19 | void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
|
|---|
| 20 | {
|
|---|
| 21 | CAST_LONG l, r, t;
|
|---|
| 22 | const CAST_LONG *k;
|
|---|
| 23 |
|
|---|
| 24 | k = &(key->data[0]);
|
|---|
| 25 | l = data[0];
|
|---|
| 26 | r = data[1];
|
|---|
| 27 |
|
|---|
| 28 | E_CAST(0, k, l, r, +, ^, -);
|
|---|
| 29 | E_CAST(1, k, r, l, ^, -, +);
|
|---|
| 30 | E_CAST(2, k, l, r, -, +, ^);
|
|---|
| 31 | E_CAST(3, k, r, l, +, ^, -);
|
|---|
| 32 | E_CAST(4, k, l, r, ^, -, +);
|
|---|
| 33 | E_CAST(5, k, r, l, -, +, ^);
|
|---|
| 34 | E_CAST(6, k, l, r, +, ^, -);
|
|---|
| 35 | E_CAST(7, k, r, l, ^, -, +);
|
|---|
| 36 | E_CAST(8, k, l, r, -, +, ^);
|
|---|
| 37 | E_CAST(9, k, r, l, +, ^, -);
|
|---|
| 38 | E_CAST(10, k, l, r, ^, -, +);
|
|---|
| 39 | E_CAST(11, k, r, l, -, +, ^);
|
|---|
| 40 | if (!key->short_key) {
|
|---|
| 41 | E_CAST(12, k, l, r, +, ^, -);
|
|---|
| 42 | E_CAST(13, k, r, l, ^, -, +);
|
|---|
| 43 | E_CAST(14, k, l, r, -, +, ^);
|
|---|
| 44 | E_CAST(15, k, r, l, +, ^, -);
|
|---|
| 45 | }
|
|---|
| 46 |
|
|---|
| 47 | data[1] = l & 0xffffffffL;
|
|---|
| 48 | data[0] = r & 0xffffffffL;
|
|---|
| 49 | }
|
|---|
| 50 |
|
|---|
| 51 | void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
|
|---|
| 52 | {
|
|---|
| 53 | CAST_LONG l, r, t;
|
|---|
| 54 | const CAST_LONG *k;
|
|---|
| 55 |
|
|---|
| 56 | k = &(key->data[0]);
|
|---|
| 57 | l = data[0];
|
|---|
| 58 | r = data[1];
|
|---|
| 59 |
|
|---|
| 60 | if (!key->short_key) {
|
|---|
| 61 | E_CAST(15, k, l, r, +, ^, -);
|
|---|
| 62 | E_CAST(14, k, r, l, -, +, ^);
|
|---|
| 63 | E_CAST(13, k, l, r, ^, -, +);
|
|---|
| 64 | E_CAST(12, k, r, l, +, ^, -);
|
|---|
| 65 | }
|
|---|
| 66 | E_CAST(11, k, l, r, -, +, ^);
|
|---|
| 67 | E_CAST(10, k, r, l, ^, -, +);
|
|---|
| 68 | E_CAST(9, k, l, r, +, ^, -);
|
|---|
| 69 | E_CAST(8, k, r, l, -, +, ^);
|
|---|
| 70 | E_CAST(7, k, l, r, ^, -, +);
|
|---|
| 71 | E_CAST(6, k, r, l, +, ^, -);
|
|---|
| 72 | E_CAST(5, k, l, r, -, +, ^);
|
|---|
| 73 | E_CAST(4, k, r, l, ^, -, +);
|
|---|
| 74 | E_CAST(3, k, l, r, +, ^, -);
|
|---|
| 75 | E_CAST(2, k, r, l, -, +, ^);
|
|---|
| 76 | E_CAST(1, k, l, r, ^, -, +);
|
|---|
| 77 | E_CAST(0, k, r, l, +, ^, -);
|
|---|
| 78 |
|
|---|
| 79 | data[1] = l & 0xffffffffL;
|
|---|
| 80 | data[0] = r & 0xffffffffL;
|
|---|
| 81 | }
|
|---|
| 82 |
|
|---|
| 83 | void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out,
|
|---|
| 84 | long length, const CAST_KEY *ks, unsigned char *iv,
|
|---|
| 85 | int enc)
|
|---|
| 86 | {
|
|---|
| 87 | register CAST_LONG tin0, tin1;
|
|---|
| 88 | register CAST_LONG tout0, tout1, xor0, xor1;
|
|---|
| 89 | register long l = length;
|
|---|
| 90 | CAST_LONG tin[2];
|
|---|
| 91 |
|
|---|
| 92 | if (enc) {
|
|---|
| 93 | n2l(iv, tout0);
|
|---|
| 94 | n2l(iv, tout1);
|
|---|
| 95 | iv -= 8;
|
|---|
| 96 | for (l -= 8; l >= 0; l -= 8) {
|
|---|
| 97 | n2l(in, tin0);
|
|---|
| 98 | n2l(in, tin1);
|
|---|
| 99 | tin0 ^= tout0;
|
|---|
| 100 | tin1 ^= tout1;
|
|---|
| 101 | tin[0] = tin0;
|
|---|
| 102 | tin[1] = tin1;
|
|---|
| 103 | CAST_encrypt(tin, ks);
|
|---|
| 104 | tout0 = tin[0];
|
|---|
| 105 | tout1 = tin[1];
|
|---|
| 106 | l2n(tout0, out);
|
|---|
| 107 | l2n(tout1, out);
|
|---|
| 108 | }
|
|---|
| 109 | if (l != -8) {
|
|---|
| 110 | n2ln(in, tin0, tin1, l + 8);
|
|---|
| 111 | tin0 ^= tout0;
|
|---|
| 112 | tin1 ^= tout1;
|
|---|
| 113 | tin[0] = tin0;
|
|---|
| 114 | tin[1] = tin1;
|
|---|
| 115 | CAST_encrypt(tin, ks);
|
|---|
| 116 | tout0 = tin[0];
|
|---|
| 117 | tout1 = tin[1];
|
|---|
| 118 | l2n(tout0, out);
|
|---|
| 119 | l2n(tout1, out);
|
|---|
| 120 | }
|
|---|
| 121 | l2n(tout0, iv);
|
|---|
| 122 | l2n(tout1, iv);
|
|---|
| 123 | } else {
|
|---|
| 124 | n2l(iv, xor0);
|
|---|
| 125 | n2l(iv, xor1);
|
|---|
| 126 | iv -= 8;
|
|---|
| 127 | for (l -= 8; l >= 0; l -= 8) {
|
|---|
| 128 | n2l(in, tin0);
|
|---|
| 129 | n2l(in, tin1);
|
|---|
| 130 | tin[0] = tin0;
|
|---|
| 131 | tin[1] = tin1;
|
|---|
| 132 | CAST_decrypt(tin, ks);
|
|---|
| 133 | tout0 = tin[0] ^ xor0;
|
|---|
| 134 | tout1 = tin[1] ^ xor1;
|
|---|
| 135 | l2n(tout0, out);
|
|---|
| 136 | l2n(tout1, out);
|
|---|
| 137 | xor0 = tin0;
|
|---|
| 138 | xor1 = tin1;
|
|---|
| 139 | }
|
|---|
| 140 | if (l != -8) {
|
|---|
| 141 | n2l(in, tin0);
|
|---|
| 142 | n2l(in, tin1);
|
|---|
| 143 | tin[0] = tin0;
|
|---|
| 144 | tin[1] = tin1;
|
|---|
| 145 | CAST_decrypt(tin, ks);
|
|---|
| 146 | tout0 = tin[0] ^ xor0;
|
|---|
| 147 | tout1 = tin[1] ^ xor1;
|
|---|
| 148 | l2nn(tout0, tout1, out, l + 8);
|
|---|
| 149 | xor0 = tin0;
|
|---|
| 150 | xor1 = tin1;
|
|---|
| 151 | }
|
|---|
| 152 | l2n(xor0, iv);
|
|---|
| 153 | l2n(xor1, iv);
|
|---|
| 154 | }
|
|---|
| 155 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
|
|---|
| 156 | tin[0] = tin[1] = 0;
|
|---|
| 157 | }
|
|---|
