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
RC2_cbc_encrypt(const unsigned char * in,unsigned char * out,long length,RC2_KEY * ks,unsigned char * iv,int encrypt)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
RC2_encrypt(unsigned long * d,RC2_KEY * key)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
RC2_decrypt(unsigned long * d,RC2_KEY * key)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