1/* crypto/mdc2/mdc2dgst.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 <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <openssl/des.h>
63#include <openssl/mdc2.h>
64
65#undef c2l
66#define c2l(c,l)	(l =((DES_LONG)(*((c)++)))    , \
67			 l|=((DES_LONG)(*((c)++)))<< 8L, \
68			 l|=((DES_LONG)(*((c)++)))<<16L, \
69			 l|=((DES_LONG)(*((c)++)))<<24L)
70
71#undef l2c
72#define l2c(l,c)	(*((c)++)=(unsigned char)(((l)     )&0xff), \
73			*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
74			*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
75			*((c)++)=(unsigned char)(((l)>>24L)&0xff))
76
77static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len);
78int MDC2_Init(MDC2_CTX *c)
79	{
80	c->num=0;
81	c->pad_type=1;
82	memset(&(c->h[0]),0x52,MDC2_BLOCK);
83	memset(&(c->hh[0]),0x25,MDC2_BLOCK);
84	return 1;
85	}
86
87int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)
88	{
89	size_t i,j;
90
91	i=c->num;
92	if (i != 0)
93		{
94		if (i+len < MDC2_BLOCK)
95			{
96			/* partial block */
97			memcpy(&(c->data[i]),in,len);
98			c->num+=(int)len;
99			return 1;
100			}
101		else
102			{
103			/* filled one */
104			j=MDC2_BLOCK-i;
105			memcpy(&(c->data[i]),in,j);
106			len-=j;
107			in+=j;
108			c->num=0;
109			mdc2_body(c,&(c->data[0]),MDC2_BLOCK);
110			}
111		}
112	i=len&~((size_t)MDC2_BLOCK-1);
113	if (i > 0) mdc2_body(c,in,i);
114	j=len-i;
115	if (j > 0)
116		{
117		memcpy(&(c->data[0]),&(in[i]),j);
118		c->num=(int)j;
119		}
120	return 1;
121	}
122
123static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)
124	{
125	register DES_LONG tin0,tin1;
126	register DES_LONG ttin0,ttin1;
127	DES_LONG d[2],dd[2];
128	DES_key_schedule k;
129	unsigned char *p;
130	size_t i;
131
132	for (i=0; i<len; i+=8)
133		{
134		c2l(in,tin0); d[0]=dd[0]=tin0;
135		c2l(in,tin1); d[1]=dd[1]=tin1;
136		c->h[0]=(c->h[0]&0x9f)|0x40;
137		c->hh[0]=(c->hh[0]&0x9f)|0x20;
138
139		DES_set_odd_parity(&c->h);
140		DES_set_key_unchecked(&c->h,&k);
141		DES_encrypt1(d,&k,1);
142
143		DES_set_odd_parity(&c->hh);
144		DES_set_key_unchecked(&c->hh,&k);
145		DES_encrypt1(dd,&k,1);
146
147		ttin0=tin0^dd[0];
148		ttin1=tin1^dd[1];
149		tin0^=d[0];
150		tin1^=d[1];
151
152		p=c->h;
153		l2c(tin0,p);
154		l2c(ttin1,p);
155		p=c->hh;
156		l2c(ttin0,p);
157		l2c(tin1,p);
158		}
159	}
160
161int MDC2_Final(unsigned char *md, MDC2_CTX *c)
162	{
163	unsigned int i;
164	int j;
165
166	i=c->num;
167	j=c->pad_type;
168	if ((i > 0) || (j == 2))
169		{
170		if (j == 2)
171			c->data[i++]=0x80;
172		memset(&(c->data[i]),0,MDC2_BLOCK-i);
173		mdc2_body(c,c->data,MDC2_BLOCK);
174		}
175	memcpy(md,(char *)c->h,MDC2_BLOCK);
176	memcpy(&(md[MDC2_BLOCK]),(char *)c->hh,MDC2_BLOCK);
177	return 1;
178	}
179
180#undef TEST
181
182#ifdef TEST
183main()
184	{
185	unsigned char md[MDC2_DIGEST_LENGTH];
186	int i;
187	MDC2_CTX c;
188	static char *text="Now is the time for all ";
189
190	MDC2_Init(&c);
191	MDC2_Update(&c,text,strlen(text));
192	MDC2_Final(&(md[0]),&c);
193
194	for (i=0; i<MDC2_DIGEST_LENGTH; i++)
195		printf("%02X",md[i]);
196	printf("\n");
197	}
198
199#endif
200