| 1 | /*
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| 2 | * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (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 | /*
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| 11 | * RC5 low level APIs are deprecated for public use, but still ok for internal
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| 12 | * use.
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| 13 | */
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| 14 | #include "internal/deprecated.h"
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| 15 |
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| 16 | #include <stdio.h>
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| 17 | #include <openssl/rc5.h>
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| 18 | #include "rc5_local.h"
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| 19 |
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| 20 | void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,
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| 21 | long length, RC5_32_KEY *ks, unsigned char *iv,
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| 22 | int encrypt)
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| 23 | {
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| 24 | register unsigned long tin0, tin1;
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| 25 | register unsigned long tout0, tout1, xor0, xor1;
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| 26 | register long l = length;
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| 27 | unsigned long tin[2];
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| 28 |
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| 29 | if (encrypt) {
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| 30 | c2l(iv, tout0);
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| 31 | c2l(iv, tout1);
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| 32 | iv -= 8;
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| 33 | for (l -= 8; l >= 0; l -= 8) {
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| 34 | c2l(in, tin0);
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| 35 | c2l(in, tin1);
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| 36 | tin0 ^= tout0;
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| 37 | tin1 ^= tout1;
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| 38 | tin[0] = tin0;
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| 39 | tin[1] = tin1;
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| 40 | RC5_32_encrypt(tin, ks);
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| 41 | tout0 = tin[0];
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| 42 | l2c(tout0, out);
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| 43 | tout1 = tin[1];
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| 44 | l2c(tout1, out);
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| 45 | }
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| 46 | if (l != -8) {
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| 47 | c2ln(in, tin0, tin1, l + 8);
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| 48 | tin0 ^= tout0;
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| 49 | tin1 ^= tout1;
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| 50 | tin[0] = tin0;
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| 51 | tin[1] = tin1;
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| 52 | RC5_32_encrypt(tin, ks);
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| 53 | tout0 = tin[0];
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| 54 | l2c(tout0, out);
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| 55 | tout1 = tin[1];
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| 56 | l2c(tout1, out);
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| 57 | }
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| 58 | l2c(tout0, iv);
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| 59 | l2c(tout1, iv);
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| 60 | } else {
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| 61 | c2l(iv, xor0);
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| 62 | c2l(iv, xor1);
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| 63 | iv -= 8;
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| 64 | for (l -= 8; l >= 0; l -= 8) {
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| 65 | c2l(in, tin0);
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| 66 | tin[0] = tin0;
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| 67 | c2l(in, tin1);
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| 68 | tin[1] = tin1;
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| 69 | RC5_32_decrypt(tin, ks);
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| 70 | tout0 = tin[0] ^ xor0;
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| 71 | tout1 = tin[1] ^ xor1;
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| 72 | l2c(tout0, out);
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| 73 | l2c(tout1, out);
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| 74 | xor0 = tin0;
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| 75 | xor1 = tin1;
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| 76 | }
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| 77 | if (l != -8) {
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| 78 | c2l(in, tin0);
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| 79 | tin[0] = tin0;
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| 80 | c2l(in, tin1);
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| 81 | tin[1] = tin1;
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| 82 | RC5_32_decrypt(tin, ks);
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| 83 | tout0 = tin[0] ^ xor0;
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| 84 | tout1 = tin[1] ^ xor1;
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| 85 | l2cn(tout0, tout1, out, l + 8);
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| 86 | xor0 = tin0;
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| 87 | xor1 = tin1;
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| 88 | }
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| 89 | l2c(xor0, iv);
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| 90 | l2c(xor1, iv);
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| 91 | }
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| 92 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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| 93 | tin[0] = tin[1] = 0;
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| 94 | }
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| 95 |
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| 96 | void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key)
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| 97 | {
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| 98 | RC5_32_INT a, b, *s;
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| 99 |
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| 100 | s = key->data;
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| 101 |
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| 102 | a = d[0] + s[0];
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| 103 | b = d[1] + s[1];
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| 104 | E_RC5_32(a, b, s, 2);
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| 105 | E_RC5_32(a, b, s, 4);
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| 106 | E_RC5_32(a, b, s, 6);
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| 107 | E_RC5_32(a, b, s, 8);
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| 108 | E_RC5_32(a, b, s, 10);
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| 109 | E_RC5_32(a, b, s, 12);
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| 110 | E_RC5_32(a, b, s, 14);
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| 111 | E_RC5_32(a, b, s, 16);
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| 112 | if (key->rounds == 12) {
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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 | } else if (key->rounds == 16) {
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| 118 | /* Do a full expansion to avoid a jump */
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| 119 | E_RC5_32(a, b, s, 18);
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| 120 | E_RC5_32(a, b, s, 20);
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| 121 | E_RC5_32(a, b, s, 22);
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| 122 | E_RC5_32(a, b, s, 24);
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| 123 | E_RC5_32(a, b, s, 26);
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| 124 | E_RC5_32(a, b, s, 28);
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| 125 | E_RC5_32(a, b, s, 30);
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| 126 | E_RC5_32(a, b, s, 32);
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| 127 | }
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| 128 | d[0] = a;
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| 129 | d[1] = b;
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| 130 | }
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| 131 |
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| 132 | void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key)
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| 133 | {
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| 134 | RC5_32_INT a, b, *s;
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| 135 |
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| 136 | s = key->data;
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| 137 |
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| 138 | a = d[0];
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| 139 | b = d[1];
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| 140 | if (key->rounds == 16) {
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| 141 | D_RC5_32(a, b, s, 32);
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| 142 | D_RC5_32(a, b, s, 30);
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| 143 | D_RC5_32(a, b, s, 28);
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| 144 | D_RC5_32(a, b, s, 26);
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| 145 | /* Do a full expansion to avoid a jump */
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| 146 | D_RC5_32(a, b, s, 24);
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| 147 | D_RC5_32(a, b, s, 22);
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| 148 | D_RC5_32(a, b, s, 20);
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| 149 | D_RC5_32(a, b, s, 18);
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| 150 | } else if (key->rounds == 12) {
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| 151 | D_RC5_32(a, b, s, 24);
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| 152 | D_RC5_32(a, b, s, 22);
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| 153 | D_RC5_32(a, b, s, 20);
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| 154 | D_RC5_32(a, b, s, 18);
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| 155 | }
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| 156 | D_RC5_32(a, b, s, 16);
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| 157 | D_RC5_32(a, b, s, 14);
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| 158 | D_RC5_32(a, b, s, 12);
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| 159 | D_RC5_32(a, b, s, 10);
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| 160 | D_RC5_32(a, b, s, 8);
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| 161 | D_RC5_32(a, b, s, 6);
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| 162 | D_RC5_32(a, b, s, 4);
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| 163 | D_RC5_32(a, b, s, 2);
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| 164 | d[0] = a - s[0];
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| 165 | d[1] = b - s[1];
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| 166 | }
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