[331] | 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/rc2.h>
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| 11 | #include "rc2_locl.h"
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| 12 |
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| 13 | void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
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| 14 | RC2_KEY *ks, unsigned char *iv, int encrypt)
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| 15 | {
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| 16 | register unsigned long tin0, tin1;
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| 17 | register unsigned long tout0, tout1, xor0, xor1;
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| 18 | register long l = length;
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| 19 | unsigned long tin[2];
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| 20 |
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| 21 | if (encrypt) {
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| 22 | c2l(iv, tout0);
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| 23 | c2l(iv, tout1);
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| 24 | iv -= 8;
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| 25 | for (l -= 8; l >= 0; l -= 8) {
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| 26 | c2l(in, tin0);
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| 27 | c2l(in, tin1);
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| 28 | tin0 ^= tout0;
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| 29 | tin1 ^= tout1;
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| 30 | tin[0] = tin0;
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| 31 | tin[1] = tin1;
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| 32 | RC2_encrypt(tin, ks);
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| 33 | tout0 = tin[0];
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| 34 | l2c(tout0, out);
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| 35 | tout1 = tin[1];
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| 36 | l2c(tout1, out);
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| 37 | }
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| 38 | if (l != -8) {
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| 39 | c2ln(in, tin0, tin1, l + 8);
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| 40 | tin0 ^= tout0;
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| 41 | tin1 ^= tout1;
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| 42 | tin[0] = tin0;
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| 43 | tin[1] = tin1;
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| 44 | RC2_encrypt(tin, ks);
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| 45 | tout0 = tin[0];
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| 46 | l2c(tout0, out);
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| 47 | tout1 = tin[1];
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| 48 | l2c(tout1, out);
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| 49 | }
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| 50 | l2c(tout0, iv);
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| 51 | l2c(tout1, iv);
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| 52 | } else {
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| 53 | c2l(iv, xor0);
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| 54 | c2l(iv, xor1);
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| 55 | iv -= 8;
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| 56 | for (l -= 8; l >= 0; l -= 8) {
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| 57 | c2l(in, tin0);
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| 58 | tin[0] = tin0;
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| 59 | c2l(in, tin1);
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| 60 | tin[1] = tin1;
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| 61 | RC2_decrypt(tin, ks);
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| 62 | tout0 = tin[0] ^ xor0;
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| 63 | tout1 = tin[1] ^ xor1;
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| 64 | l2c(tout0, out);
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| 65 | l2c(tout1, out);
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| 66 | xor0 = tin0;
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| 67 | xor1 = tin1;
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| 68 | }
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| 69 | if (l != -8) {
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| 70 | c2l(in, tin0);
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| 71 | tin[0] = tin0;
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| 72 | c2l(in, tin1);
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| 73 | tin[1] = tin1;
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| 74 | RC2_decrypt(tin, ks);
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| 75 | tout0 = tin[0] ^ xor0;
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| 76 | tout1 = tin[1] ^ xor1;
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| 77 | l2cn(tout0, tout1, out, l + 8);
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| 78 | xor0 = tin0;
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| 79 | xor1 = tin1;
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| 80 | }
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| 81 | l2c(xor0, iv);
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| 82 | l2c(xor1, iv);
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| 83 | }
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| 84 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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| 85 | tin[0] = tin[1] = 0;
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| 86 | }
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| 87 |
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| 88 | void RC2_encrypt(unsigned long *d, RC2_KEY *key)
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| 89 | {
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| 90 | int i, n;
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| 91 | register RC2_INT *p0, *p1;
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| 92 | register RC2_INT x0, x1, x2, x3, t;
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| 93 | unsigned long l;
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| 94 |
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| 95 | l = d[0];
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| 96 | x0 = (RC2_INT) l & 0xffff;
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| 97 | x1 = (RC2_INT) (l >> 16L);
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| 98 | l = d[1];
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| 99 | x2 = (RC2_INT) l & 0xffff;
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| 100 | x3 = (RC2_INT) (l >> 16L);
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| 101 |
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| 102 | n = 3;
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| 103 | i = 5;
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| 104 |
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| 105 | p0 = p1 = &(key->data[0]);
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| 106 | for (;;) {
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| 107 | t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff;
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| 108 | x0 = (t << 1) | (t >> 15);
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| 109 | t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff;
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| 110 | x1 = (t << 2) | (t >> 14);
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| 111 | t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff;
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| 112 | x2 = (t << 3) | (t >> 13);
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| 113 | t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff;
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| 114 | x3 = (t << 5) | (t >> 11);
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| 115 |
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| 116 | if (--i == 0) {
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| 117 | if (--n == 0)
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| 118 | break;
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| 119 | i = (n == 2) ? 6 : 5;
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| 120 |
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| 121 | x0 += p1[x3 & 0x3f];
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| 122 | x1 += p1[x0 & 0x3f];
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| 123 | x2 += p1[x1 & 0x3f];
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| 124 | x3 += p1[x2 & 0x3f];
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| 125 | }
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| 126 | }
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| 127 |
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| 128 | d[0] =
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| 129 | (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
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| 130 | d[1] =
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| 131 | (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
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| 132 | }
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| 133 |
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| 134 | void RC2_decrypt(unsigned long *d, RC2_KEY *key)
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| 135 | {
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| 136 | int i, n;
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| 137 | register RC2_INT *p0, *p1;
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| 138 | register RC2_INT x0, x1, x2, x3, t;
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| 139 | unsigned long l;
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| 140 |
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| 141 | l = d[0];
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| 142 | x0 = (RC2_INT) l & 0xffff;
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| 143 | x1 = (RC2_INT) (l >> 16L);
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| 144 | l = d[1];
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| 145 | x2 = (RC2_INT) l & 0xffff;
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| 146 | x3 = (RC2_INT) (l >> 16L);
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| 147 |
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| 148 | n = 3;
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| 149 | i = 5;
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| 150 |
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| 151 | p0 = &(key->data[63]);
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| 152 | p1 = &(key->data[0]);
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| 153 | for (;;) {
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| 154 | t = ((x3 << 11) | (x3 >> 5)) & 0xffff;
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| 155 | x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff;
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| 156 | t = ((x2 << 13) | (x2 >> 3)) & 0xffff;
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| 157 | x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff;
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| 158 | t = ((x1 << 14) | (x1 >> 2)) & 0xffff;
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| 159 | x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff;
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| 160 | t = ((x0 << 15) | (x0 >> 1)) & 0xffff;
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| 161 | x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff;
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| 162 |
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| 163 | if (--i == 0) {
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| 164 | if (--n == 0)
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| 165 | break;
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| 166 | i = (n == 2) ? 6 : 5;
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| 167 |
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| 168 | x3 = (x3 - p1[x2 & 0x3f]) & 0xffff;
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| 169 | x2 = (x2 - p1[x1 & 0x3f]) & 0xffff;
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| 170 | x1 = (x1 - p1[x0 & 0x3f]) & 0xffff;
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| 171 | x0 = (x0 - p1[x3 & 0x3f]) & 0xffff;
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| 172 | }
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| 173 | }
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| 174 |
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| 175 | d[0] =
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| 176 | (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
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| 177 | d[1] =
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| 178 | (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
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| 179 | }
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