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1 /* crypto/rc2/rc2_cbc.c */ | |
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
3 * All rights reserved. | |
4 * | |
5 * This package is an SSL implementation written | |
6 * by Eric Young (eay@cryptsoft.com). | |
7 * The implementation was written so as to conform with Netscapes SSL. | |
8 * | |
9 * This library is free for commercial and non-commercial use as long as | |
10 * the following conditions are aheared to. The following conditions | |
11 * apply to all code found in this distribution, be it the RC4, RSA, | |
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 * included with this distribution is covered by the same copyright terms | |
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 * | |
16 * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 * the code are not to be removed. | |
18 * If this package is used in a product, Eric Young should be given attribution | |
19 * as the author of the parts of the library used. | |
20 * This can be in the form of a textual message at program startup or | |
21 * in documentation (online or textual) provided with the package. | |
22 * | |
23 * Redistribution and use in source and binary forms, with or without | |
24 * modification, are permitted provided that the following conditions | |
25 * are met: | |
26 * 1. Redistributions of source code must retain the copyright | |
27 * notice, this list of conditions and the following disclaimer. | |
28 * 2. Redistributions in binary form must reproduce the above copyright | |
29 * notice, this list of conditions and the following disclaimer in the | |
30 * documentation and/or other materials provided with the distribution. | |
31 * 3. All advertising materials mentioning features or use of this software | |
32 * must display the following acknowledgement: | |
33 * "This product includes cryptographic software written by | |
34 * Eric Young (eay@cryptsoft.com)" | |
35 * The word 'cryptographic' can be left out if the rouines from the library | |
36 * being used are not cryptographic related :-). | |
37 * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 * the apps directory (application code) you must include an acknowledgement: | |
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 * | |
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 * SUCH DAMAGE. | |
52 * | |
53 * The licence and distribution terms for any publically available version or | |
54 * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 * copied and put under another distribution licence | |
56 * [including the GNU Public Licence.] | |
57 */ | |
58 | |
59 #include <openssl/rc2.h> | |
60 #include "rc2_locl.h" | |
61 | |
62 void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, | |
63 RC2_KEY *ks, unsigned char *iv, int encrypt) | |
64 { | |
65 register unsigned long tin0,tin1; | |
66 register unsigned long tout0,tout1,xor0,xor1; | |
67 register long l=length; | |
68 unsigned long tin[2]; | |
69 | |
70 if (encrypt) | |
71 { | |
72 c2l(iv,tout0); | |
73 c2l(iv,tout1); | |
74 iv-=8; | |
75 for (l-=8; l>=0; l-=8) | |
76 { | |
77 c2l(in,tin0); | |
78 c2l(in,tin1); | |
79 tin0^=tout0; | |
80 tin1^=tout1; | |
81 tin[0]=tin0; | |
82 tin[1]=tin1; | |
83 RC2_encrypt(tin,ks); | |
84 tout0=tin[0]; l2c(tout0,out); | |
85 tout1=tin[1]; l2c(tout1,out); | |
86 } | |
87 if (l != -8) | |
88 { | |
89 c2ln(in,tin0,tin1,l+8); | |
90 tin0^=tout0; | |
91 tin1^=tout1; | |
92 tin[0]=tin0; | |
93 tin[1]=tin1; | |
94 RC2_encrypt(tin,ks); | |
95 tout0=tin[0]; l2c(tout0,out); | |
96 tout1=tin[1]; l2c(tout1,out); | |
97 } | |
98 l2c(tout0,iv); | |
99 l2c(tout1,iv); | |
100 } | |
101 else | |
102 { | |
103 c2l(iv,xor0); | |
104 c2l(iv,xor1); | |
105 iv-=8; | |
106 for (l-=8; l>=0; l-=8) | |
107 { | |
108 c2l(in,tin0); tin[0]=tin0; | |
109 c2l(in,tin1); tin[1]=tin1; | |
110 RC2_decrypt(tin,ks); | |
111 tout0=tin[0]^xor0; | |
112 tout1=tin[1]^xor1; | |
113 l2c(tout0,out); | |
114 l2c(tout1,out); | |
115 xor0=tin0; | |
116 xor1=tin1; | |
117 } | |
118 if (l != -8) | |
119 { | |
120 c2l(in,tin0); tin[0]=tin0; | |
121 c2l(in,tin1); tin[1]=tin1; | |
122 RC2_decrypt(tin,ks); | |
123 tout0=tin[0]^xor0; | |
124 tout1=tin[1]^xor1; | |
125 l2cn(tout0,tout1,out,l+8); | |
126 xor0=tin0; | |
127 xor1=tin1; | |
128 } | |
129 l2c(xor0,iv); | |
130 l2c(xor1,iv); | |
131 } | |
132 tin0=tin1=tout0=tout1=xor0=xor1=0; | |
133 tin[0]=tin[1]=0; | |
134 } | |
135 | |
136 void RC2_encrypt(unsigned long *d, RC2_KEY *key) | |
137 { | |
138 int i,n; | |
139 register RC2_INT *p0,*p1; | |
140 register RC2_INT x0,x1,x2,x3,t; | |
141 unsigned long l; | |
142 | |
143 l=d[0]; | |
144 x0=(RC2_INT)l&0xffff; | |
145 x1=(RC2_INT)(l>>16L); | |
146 l=d[1]; | |
147 x2=(RC2_INT)l&0xffff; | |
148 x3=(RC2_INT)(l>>16L); | |
149 | |
150 n=3; | |
151 i=5; | |
152 | |
153 p0=p1= &(key->data[0]); | |
154 for (;;) | |
155 { | |
156 t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff; | |
157 x0=(t<<1)|(t>>15); | |
158 t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff; | |
159 x1=(t<<2)|(t>>14); | |
160 t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff; | |
161 x2=(t<<3)|(t>>13); | |
162 t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff; | |
163 x3=(t<<5)|(t>>11); | |
164 | |
165 if (--i == 0) | |
166 { | |
167 if (--n == 0) break; | |
168 i=(n == 2)?6:5; | |
169 | |
170 x0+=p1[x3&0x3f]; | |
171 x1+=p1[x0&0x3f]; | |
172 x2+=p1[x1&0x3f]; | |
173 x3+=p1[x2&0x3f]; | |
174 } | |
175 } | |
176 | |
177 d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L); | |
178 d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L); | |
179 } | |
180 | |
181 void RC2_decrypt(unsigned long *d, RC2_KEY *key) | |
182 { | |
183 int i,n; | |
184 register RC2_INT *p0,*p1; | |
185 register RC2_INT x0,x1,x2,x3,t; | |
186 unsigned long l; | |
187 | |
188 l=d[0]; | |
189 x0=(RC2_INT)l&0xffff; | |
190 x1=(RC2_INT)(l>>16L); | |
191 l=d[1]; | |
192 x2=(RC2_INT)l&0xffff; | |
193 x3=(RC2_INT)(l>>16L); | |
194 | |
195 n=3; | |
196 i=5; | |
197 | |
198 p0= &(key->data[63]); | |
199 p1= &(key->data[0]); | |
200 for (;;) | |
201 { | |
202 t=((x3<<11)|(x3>>5))&0xffff; | |
203 x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff; | |
204 t=((x2<<13)|(x2>>3))&0xffff; | |
205 x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff; | |
206 t=((x1<<14)|(x1>>2))&0xffff; | |
207 x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff; | |
208 t=((x0<<15)|(x0>>1))&0xffff; | |
209 x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff; | |
210 | |
211 if (--i == 0) | |
212 { | |
213 if (--n == 0) break; | |
214 i=(n == 2)?6:5; | |
215 | |
216 x3=(x3-p1[x2&0x3f])&0xffff; | |
217 x2=(x2-p1[x1&0x3f])&0xffff; | |
218 x1=(x1-p1[x0&0x3f])&0xffff; | |
219 x0=(x0-p1[x3&0x3f])&0xffff; | |
220 } | |
221 } | |
222 | |
223 d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L); | |
224 d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L); | |
225 } | |
226 | |
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