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1 /* crypto/des/cfb64ede.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 "des_locl.h" | |
60 #include "e_os.h" | |
61 | |
62 /* The input and output encrypted as though 64bit cfb mode is being | |
63 * used. The extra state information to record how much of the | |
64 * 64bit block we have used is contained in *num; | |
65 */ | |
66 | |
67 void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, | |
68 long length, DES_key_schedule *ks1, | |
69 DES_key_schedule *ks2, DES_key_schedule *ks3, | |
70 DES_cblock *ivec, int *num, int enc) | |
71 { | |
72 register DES_LONG v0,v1; | |
73 register long l=length; | |
74 register int n= *num; | |
75 DES_LONG ti[2]; | |
76 unsigned char *iv,c,cc; | |
77 | |
78 iv=&(*ivec)[0]; | |
79 if (enc) | |
80 { | |
81 while (l--) | |
82 { | |
83 if (n == 0) | |
84 { | |
85 c2l(iv,v0); | |
86 c2l(iv,v1); | |
87 | |
88 ti[0]=v0; | |
89 ti[1]=v1; | |
90 DES_encrypt3(ti,ks1,ks2,ks3); | |
91 v0=ti[0]; | |
92 v1=ti[1]; | |
93 | |
94 iv = &(*ivec)[0]; | |
95 l2c(v0,iv); | |
96 l2c(v1,iv); | |
97 iv = &(*ivec)[0]; | |
98 } | |
99 c= *(in++)^iv[n]; | |
100 *(out++)=c; | |
101 iv[n]=c; | |
102 n=(n+1)&0x07; | |
103 } | |
104 } | |
105 else | |
106 { | |
107 while (l--) | |
108 { | |
109 if (n == 0) | |
110 { | |
111 c2l(iv,v0); | |
112 c2l(iv,v1); | |
113 | |
114 ti[0]=v0; | |
115 ti[1]=v1; | |
116 DES_encrypt3(ti,ks1,ks2,ks3); | |
117 v0=ti[0]; | |
118 v1=ti[1]; | |
119 | |
120 iv = &(*ivec)[0]; | |
121 l2c(v0,iv); | |
122 l2c(v1,iv); | |
123 iv = &(*ivec)[0]; | |
124 } | |
125 cc= *(in++); | |
126 c=iv[n]; | |
127 iv[n]=cc; | |
128 *(out++)=c^cc; | |
129 n=(n+1)&0x07; | |
130 } | |
131 } | |
132 v0=v1=ti[0]=ti[1]=c=cc=0; | |
133 *num=n; | |
134 } | |
135 | |
136 #ifdef undef /* MACRO */ | |
137 void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length, | |
138 DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec), | |
139 int *num, int enc) | |
140 { | |
141 DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc); | |
142 } | |
143 #endif | |
144 | |
145 /* This is compatible with the single key CFB-r for DES, even thought that's | |
146 * not what EVP needs. | |
147 */ | |
148 | |
149 void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out, | |
150 int numbits,long length,DES_key_schedule *ks1, | |
151 DES_key_schedule *ks2,DES_key_schedule *ks3, | |
152 DES_cblock *ivec,int enc) | |
153 { | |
154 register DES_LONG d0,d1,v0,v1; | |
155 register unsigned long l=length,n=((unsigned int)numbits+7)/8; | |
156 register int num=numbits,i; | |
157 DES_LONG ti[2]; | |
158 unsigned char *iv; | |
159 unsigned char ovec[16]; | |
160 | |
161 if (num > 64) return; | |
162 iv = &(*ivec)[0]; | |
163 c2l(iv,v0); | |
164 c2l(iv,v1); | |
165 if (enc) | |
166 { | |
167 while (l >= n) | |
168 { | |
169 l-=n; | |
170 ti[0]=v0; | |
171 ti[1]=v1; | |
172 DES_encrypt3(ti,ks1,ks2,ks3); | |
173 c2ln(in,d0,d1,n); | |
174 in+=n; | |
175 d0^=ti[0]; | |
176 d1^=ti[1]; | |
177 l2cn(d0,d1,out,n); | |
178 out+=n; | |
179 /* 30-08-94 - eay - changed because l>>32 and | |
180 * l<<32 are bad under gcc :-( */ | |
181 if (num == 32) | |
182 { v0=v1; v1=d0; } | |
183 else if (num == 64) | |
184 { v0=d0; v1=d1; } | |
185 else | |
186 { | |
187 iv=&ovec[0]; | |
188 l2c(v0,iv); | |
189 l2c(v1,iv); | |
190 l2c(d0,iv); | |
191 l2c(d1,iv); | |
192 /* shift ovec left most of the bits... */ | |
193 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); | |
194 /* now the remaining bits */ | |
195 if(num%8 != 0) | |
196 for(i=0 ; i < 8 ; ++i) | |
197 { | |
198 ovec[i]<<=num%8; | |
199 ovec[i]|=ovec[i+1]>>(8-num%8); | |
200 } | |
201 iv=&ovec[0]; | |
202 c2l(iv,v0); | |
203 c2l(iv,v1); | |
204 } | |
205 } | |
206 } | |
207 else | |
208 { | |
209 while (l >= n) | |
210 { | |
211 l-=n; | |
212 ti[0]=v0; | |
213 ti[1]=v1; | |
214 DES_encrypt3(ti,ks1,ks2,ks3); | |
215 c2ln(in,d0,d1,n); | |
216 in+=n; | |
217 /* 30-08-94 - eay - changed because l>>32 and | |
218 * l<<32 are bad under gcc :-( */ | |
219 if (num == 32) | |
220 { v0=v1; v1=d0; } | |
221 else if (num == 64) | |
222 { v0=d0; v1=d1; } | |
223 else | |
224 { | |
225 iv=&ovec[0]; | |
226 l2c(v0,iv); | |
227 l2c(v1,iv); | |
228 l2c(d0,iv); | |
229 l2c(d1,iv); | |
230 /* shift ovec left most of the bits... */ | |
231 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); | |
232 /* now the remaining bits */ | |
233 if(num%8 != 0) | |
234 for(i=0 ; i < 8 ; ++i) | |
235 { | |
236 ovec[i]<<=num%8; | |
237 ovec[i]|=ovec[i+1]>>(8-num%8); | |
238 } | |
239 iv=&ovec[0]; | |
240 c2l(iv,v0); | |
241 c2l(iv,v1); | |
242 } | |
243 d0^=ti[0]; | |
244 d1^=ti[1]; | |
245 l2cn(d0,d1,out,n); | |
246 out+=n; | |
247 } | |
248 } | |
249 iv = &(*ivec)[0]; | |
250 l2c(v0,iv); | |
251 l2c(v1,iv); | |
252 v0=v1=d0=d1=ti[0]=ti[1]=0; | |
253 } | |
254 | |
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