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 * RC2 low level APIs are deprecated for public use, but still ok for internal 12 * use. 13 */ 14 #include "internal/deprecated.h" 15 16 #include <openssl/rc2.h> 17 #include "rc2_local.h" 18 19 void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 20 RC2_KEY *ks, unsigned char *iv, int encrypt) 21 { 22 register unsigned long tin0, tin1; 23 register unsigned long tout0, tout1, xor0, xor1; 24 register long l = length; 25 unsigned long tin[2]; 26 27 if (encrypt) { 28 c2l(iv, tout0); 29 c2l(iv, tout1); 30 iv -= 8; 31 for (l -= 8; l >= 0; l -= 8) { 32 c2l(in, tin0); 33 c2l(in, tin1); 34 tin0 ^= tout0; 35 tin1 ^= tout1; 36 tin[0] = tin0; 37 tin[1] = tin1; 38 RC2_encrypt(tin, ks); 39 tout0 = tin[0]; 40 l2c(tout0, out); 41 tout1 = tin[1]; 42 l2c(tout1, out); 43 } 44 if (l != -8) { 45 c2ln(in, tin0, tin1, l + 8); 46 tin0 ^= tout0; 47 tin1 ^= tout1; 48 tin[0] = tin0; 49 tin[1] = tin1; 50 RC2_encrypt(tin, ks); 51 tout0 = tin[0]; 52 l2c(tout0, out); 53 tout1 = tin[1]; 54 l2c(tout1, out); 55 } 56 l2c(tout0, iv); 57 l2c(tout1, iv); 58 } else { 59 c2l(iv, xor0); 60 c2l(iv, xor1); 61 iv -= 8; 62 for (l -= 8; l >= 0; l -= 8) { 63 c2l(in, tin0); 64 tin[0] = tin0; 65 c2l(in, tin1); 66 tin[1] = tin1; 67 RC2_decrypt(tin, ks); 68 tout0 = tin[0] ^ xor0; 69 tout1 = tin[1] ^ xor1; 70 l2c(tout0, out); 71 l2c(tout1, out); 72 xor0 = tin0; 73 xor1 = tin1; 74 } 75 if (l != -8) { 76 c2l(in, tin0); 77 tin[0] = tin0; 78 c2l(in, tin1); 79 tin[1] = tin1; 80 RC2_decrypt(tin, ks); 81 tout0 = tin[0] ^ xor0; 82 tout1 = tin[1] ^ xor1; 83 l2cn(tout0, tout1, out, l + 8); 84 xor0 = tin0; 85 xor1 = tin1; 86 } 87 l2c(xor0, iv); 88 l2c(xor1, iv); 89 } 90 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; 91 tin[0] = tin[1] = 0; 92 } 93 94 void RC2_encrypt(unsigned long *d, RC2_KEY *key) 95 { 96 int i, n; 97 register RC2_INT *p0, *p1; 98 register RC2_INT x0, x1, x2, x3, t; 99 unsigned long l; 100 101 l = d[0]; 102 x0 = (RC2_INT) l & 0xffff; 103 x1 = (RC2_INT) (l >> 16L); 104 l = d[1]; 105 x2 = (RC2_INT) l & 0xffff; 106 x3 = (RC2_INT) (l >> 16L); 107 108 n = 3; 109 i = 5; 110 111 p0 = p1 = &(key->data[0]); 112 for (;;) { 113 t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff; 114 x0 = (t << 1) | (t >> 15); 115 t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff; 116 x1 = (t << 2) | (t >> 14); 117 t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff; 118 x2 = (t << 3) | (t >> 13); 119 t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff; 120 x3 = (t << 5) | (t >> 11); 121 122 if (--i == 0) { 123 if (--n == 0) 124 break; 125 i = (n == 2) ? 6 : 5; 126 127 x0 += p1[x3 & 0x3f]; 128 x1 += p1[x0 & 0x3f]; 129 x2 += p1[x1 & 0x3f]; 130 x3 += p1[x2 & 0x3f]; 131 } 132 } 133 134 d[0] = 135 (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L); 136 d[1] = 137 (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L); 138 } 139 140 void RC2_decrypt(unsigned long *d, RC2_KEY *key) 141 { 142 int i, n; 143 register RC2_INT *p0, *p1; 144 register RC2_INT x0, x1, x2, x3, t; 145 unsigned long l; 146 147 l = d[0]; 148 x0 = (RC2_INT) l & 0xffff; 149 x1 = (RC2_INT) (l >> 16L); 150 l = d[1]; 151 x2 = (RC2_INT) l & 0xffff; 152 x3 = (RC2_INT) (l >> 16L); 153 154 n = 3; 155 i = 5; 156 157 p0 = &(key->data[63]); 158 p1 = &(key->data[0]); 159 for (;;) { 160 t = ((x3 << 11) | (x3 >> 5)) & 0xffff; 161 x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff; 162 t = ((x2 << 13) | (x2 >> 3)) & 0xffff; 163 x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff; 164 t = ((x1 << 14) | (x1 >> 2)) & 0xffff; 165 x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff; 166 t = ((x0 << 15) | (x0 >> 1)) & 0xffff; 167 x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff; 168 169 if (--i == 0) { 170 if (--n == 0) 171 break; 172 i = (n == 2) ? 6 : 5; 173 174 x3 = (x3 - p1[x2 & 0x3f]) & 0xffff; 175 x2 = (x2 - p1[x1 & 0x3f]) & 0xffff; 176 x1 = (x1 - p1[x0 & 0x3f]) & 0xffff; 177 x0 = (x0 - p1[x3 & 0x3f]) & 0xffff; 178 } 179 } 180 181 d[0] = 182 (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L); 183 d[1] = 184 (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L); 185 } 186