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1/* $OpenBSD: mdc2dgst.c,v 1.7 2014/10/28 07:35:59 jsg Exp $ */
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 <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <openssl/crypto.h>
63#include <openssl/des.h>
64#include <openssl/mdc2.h>
65
66#undef c2l
67#define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
68 l|=((DES_LONG)(*((c)++)))<< 8L, \
69 l|=((DES_LONG)(*((c)++)))<<16L, \
70 l|=((DES_LONG)(*((c)++)))<<24L)
71
72#undef l2c
73#define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
74 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
75 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
76 *((c)++)=(unsigned char)(((l)>>24L)&0xff))
77
78static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len);
79int MDC2_Init(MDC2_CTX *c)
80 {
81 c->num=0;
82 c->pad_type=1;
83 memset(&(c->h[0]),0x52,MDC2_BLOCK);
84 memset(&(c->hh[0]),0x25,MDC2_BLOCK);
85 return 1;
86 }
87
88int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)
89 {
90 size_t i,j;
91
92 i=c->num;
93 if (i != 0)
94 {
95 if (i+len < MDC2_BLOCK)
96 {
97 /* partial block */
98 memcpy(&(c->data[i]),in,len);
99 c->num+=(int)len;
100 return 1;
101 }
102 else
103 {
104 /* filled one */
105 j=MDC2_BLOCK-i;
106 memcpy(&(c->data[i]),in,j);
107 len-=j;
108 in+=j;
109 c->num=0;
110 mdc2_body(c,&(c->data[0]),MDC2_BLOCK);
111 }
112 }
113 i=len&~((size_t)MDC2_BLOCK-1);
114 if (i > 0) mdc2_body(c,in,i);
115 j=len-i;
116 if (j > 0)
117 {
118 memcpy(&(c->data[0]),&(in[i]),j);
119 c->num=(int)j;
120 }
121 return 1;
122 }
123
124static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)
125 {
126 DES_LONG tin0,tin1;
127 DES_LONG ttin0,ttin1;
128 DES_LONG d[2],dd[2];
129 DES_key_schedule k;
130 unsigned char *p;
131 size_t i;
132
133 for (i=0; i<len; i+=8)
134 {
135 c2l(in,tin0); d[0]=dd[0]=tin0;
136 c2l(in,tin1); d[1]=dd[1]=tin1;
137 c->h[0]=(c->h[0]&0x9f)|0x40;
138 c->hh[0]=(c->hh[0]&0x9f)|0x20;
139
140 DES_set_odd_parity(&c->h);
141 DES_set_key_unchecked(&c->h,&k);
142 DES_encrypt1(d,&k,1);
143
144 DES_set_odd_parity(&c->hh);
145 DES_set_key_unchecked(&c->hh,&k);
146 DES_encrypt1(dd,&k,1);
147
148 ttin0=tin0^dd[0];
149 ttin1=tin1^dd[1];
150 tin0^=d[0];
151 tin1^=d[1];
152
153 p=c->h;
154 l2c(tin0,p);
155 l2c(ttin1,p);
156 p=c->hh;
157 l2c(ttin0,p);
158 l2c(tin1,p);
159 }
160 }
161
162int MDC2_Final(unsigned char *md, MDC2_CTX *c)
163 {
164 unsigned int i;
165 int j;
166
167 i=c->num;
168 j=c->pad_type;
169 if ((i > 0) || (j == 2))
170 {
171 if (j == 2)
172 c->data[i++]=0x80;
173 memset(&(c->data[i]),0,MDC2_BLOCK-i);
174 mdc2_body(c,c->data,MDC2_BLOCK);
175 }
176 memcpy(md,(char *)c->h,MDC2_BLOCK);
177 memcpy(&(md[MDC2_BLOCK]),(char *)c->hh,MDC2_BLOCK);
178 return 1;
179 }
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