1 /* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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 #include <openssl/rc2.h> 11 #include "rc2_local.h" 12 13 void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 14 RC2_KEY *ks, unsigned char *iv, int encrypt) 15 { 16 register unsigned long tin0, tin1; 17 register unsigned long tout0, tout1, xor0, xor1; 18 register long l = length; 19 unsigned long tin[2]; 20 21 if (encrypt) { 22 c2l(iv, tout0); 23 c2l(iv, tout1); 24 iv -= 8; 25 for (l -= 8; l >= 0; l -= 8) { 26 c2l(in, tin0); 27 c2l(in, tin1); 28 tin0 ^= tout0; 29 tin1 ^= tout1; 30 tin[0] = tin0; 31 tin[1] = tin1; 32 RC2_encrypt(tin, ks); 33 tout0 = tin[0]; 34 l2c(tout0, out); 35 tout1 = tin[1]; 36 l2c(tout1, out); 37 } 38 if (l != -8) { 39 c2ln(in, tin0, tin1, l + 8); 40 tin0 ^= tout0; 41 tin1 ^= tout1; 42 tin[0] = tin0; 43 tin[1] = tin1; 44 RC2_encrypt(tin, ks); 45 tout0 = tin[0]; 46 l2c(tout0, out); 47 tout1 = tin[1]; 48 l2c(tout1, out); 49 } 50 l2c(tout0, iv); 51 l2c(tout1, iv); 52 } else { 53 c2l(iv, xor0); 54 c2l(iv, xor1); 55 iv -= 8; 56 for (l -= 8; l >= 0; l -= 8) { 57 c2l(in, tin0); 58 tin[0] = tin0; 59 c2l(in, tin1); 60 tin[1] = tin1; 61 RC2_decrypt(tin, ks); 62 tout0 = tin[0] ^ xor0; 63 tout1 = tin[1] ^ xor1; 64 l2c(tout0, out); 65 l2c(tout1, out); 66 xor0 = tin0; 67 xor1 = tin1; 68 } 69 if (l != -8) { 70 c2l(in, tin0); 71 tin[0] = tin0; 72 c2l(in, tin1); 73 tin[1] = tin1; 74 RC2_decrypt(tin, ks); 75 tout0 = tin[0] ^ xor0; 76 tout1 = tin[1] ^ xor1; 77 l2cn(tout0, tout1, out, l + 8); 78 xor0 = tin0; 79 xor1 = tin1; 80 } 81 l2c(xor0, iv); 82 l2c(xor1, iv); 83 } 84 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; 85 tin[0] = tin[1] = 0; 86 } 87 88 void RC2_encrypt(unsigned long *d, RC2_KEY *key) 89 { 90 int i, n; 91 register RC2_INT *p0, *p1; 92 register RC2_INT x0, x1, x2, x3, t; 93 unsigned long l; 94 95 l = d[0]; 96 x0 = (RC2_INT) l & 0xffff; 97 x1 = (RC2_INT) (l >> 16L); 98 l = d[1]; 99 x2 = (RC2_INT) l & 0xffff; 100 x3 = (RC2_INT) (l >> 16L); 101 102 n = 3; 103 i = 5; 104 105 p0 = p1 = &(key->data[0]); 106 for (;;) { 107 t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff; 108 x0 = (t << 1) | (t >> 15); 109 t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff; 110 x1 = (t << 2) | (t >> 14); 111 t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff; 112 x2 = (t << 3) | (t >> 13); 113 t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff; 114 x3 = (t << 5) | (t >> 11); 115 116 if (--i == 0) { 117 if (--n == 0) 118 break; 119 i = (n == 2) ? 6 : 5; 120 121 x0 += p1[x3 & 0x3f]; 122 x1 += p1[x0 & 0x3f]; 123 x2 += p1[x1 & 0x3f]; 124 x3 += p1[x2 & 0x3f]; 125 } 126 } 127 128 d[0] = 129 (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L); 130 d[1] = 131 (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L); 132 } 133 134 void RC2_decrypt(unsigned long *d, RC2_KEY *key) 135 { 136 int i, n; 137 register RC2_INT *p0, *p1; 138 register RC2_INT x0, x1, x2, x3, t; 139 unsigned long l; 140 141 l = d[0]; 142 x0 = (RC2_INT) l & 0xffff; 143 x1 = (RC2_INT) (l >> 16L); 144 l = d[1]; 145 x2 = (RC2_INT) l & 0xffff; 146 x3 = (RC2_INT) (l >> 16L); 147 148 n = 3; 149 i = 5; 150 151 p0 = &(key->data[63]); 152 p1 = &(key->data[0]); 153 for (;;) { 154 t = ((x3 << 11) | (x3 >> 5)) & 0xffff; 155 x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff; 156 t = ((x2 << 13) | (x2 >> 3)) & 0xffff; 157 x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff; 158 t = ((x1 << 14) | (x1 >> 2)) & 0xffff; 159 x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff; 160 t = ((x0 << 15) | (x0 >> 1)) & 0xffff; 161 x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff; 162 163 if (--i == 0) { 164 if (--n == 0) 165 break; 166 i = (n == 2) ? 6 : 5; 167 168 x3 = (x3 - p1[x2 & 0x3f]) & 0xffff; 169 x2 = (x2 - p1[x1 & 0x3f]) & 0xffff; 170 x1 = (x1 - p1[x0 & 0x3f]) & 0xffff; 171 x0 = (x0 - p1[x3 & 0x3f]) & 0xffff; 172 } 173 } 174 175 d[0] = 176 (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L); 177 d[1] = 178 (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L); 179 } 180