Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |