mdc2dgst.c revision 306196 
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/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);
79fips_md_init(MDC2)
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        if (len < MDC2_BLOCK - i) {
95            /* partial block */
96            memcpy(&(c->data[i]), in, len);
97            c->num += (int)len;
98            return 1;
99        } else {
100            /* filled one */
101            j = MDC2_BLOCK - i;
102            memcpy(&(c->data[i]), in, j);
103            len -= j;
104            in += j;
105            c->num = 0;
106            mdc2_body(c, &(c->data[0]), MDC2_BLOCK);
107        }
108    }
109    i = len & ~((size_t)MDC2_BLOCK - 1);
110    if (i > 0)
111        mdc2_body(c, in, i);
112    j = len - i;
113    if (j > 0) {
114        memcpy(&(c->data[0]), &(in[i]), j);
115        c->num = (int)j;
116    }
117    return 1;
118}
119
120static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)
121{
122    register DES_LONG tin0, tin1;
123    register DES_LONG ttin0, ttin1;
124    DES_LONG d[2], dd[2];
125    DES_key_schedule k;
126    unsigned char *p;
127    size_t i;
128
129    for (i = 0; i < len; i += 8) {
130        c2l(in, tin0);
131        d[0] = dd[0] = tin0;
132        c2l(in, tin1);
133        d[1] = dd[1] = tin1;
134        c->h[0] = (c->h[0] & 0x9f) | 0x40;
135        c->hh[0] = (c->hh[0] & 0x9f) | 0x20;
136
137        DES_set_odd_parity(&c->h);
138        DES_set_key_unchecked(&c->h, &k);
139        DES_encrypt1(d, &k, 1);
140
141        DES_set_odd_parity(&c->hh);
142        DES_set_key_unchecked(&c->hh, &k);
143        DES_encrypt1(dd, &k, 1);
144
145        ttin0 = tin0 ^ dd[0];
146        ttin1 = tin1 ^ dd[1];
147        tin0 ^= d[0];
148        tin1 ^= d[1];
149
150        p = c->h;
151        l2c(tin0, p);
152        l2c(ttin1, p);
153        p = c->hh;
154        l2c(ttin0, p);
155        l2c(tin1, p);
156    }
157}
158
159int MDC2_Final(unsigned char *md, MDC2_CTX *c)
160{
161    unsigned int i;
162    int j;
163
164    i = c->num;
165    j = c->pad_type;
166    if ((i > 0) || (j == 2)) {
167        if (j == 2)
168            c->data[i++] = 0x80;
169        memset(&(c->data[i]), 0, MDC2_BLOCK - i);
170        mdc2_body(c, c->data, MDC2_BLOCK);
171    }
172    memcpy(md, (char *)c->h, MDC2_BLOCK);
173    memcpy(&(md[MDC2_BLOCK]), (char *)c->hh, MDC2_BLOCK);
174    return 1;
175}
176
177#undef TEST
178
179#ifdef TEST
180main()
181{
182    unsigned char md[MDC2_DIGEST_LENGTH];
183    int i;
184    MDC2_CTX c;
185    static char *text = "Now is the time for all ";
186
187    MDC2_Init(&c);
188    MDC2_Update(&c, text, strlen(text));
189    MDC2_Final(&(md[0]), &c);
190
191    for (i = 0; i < MDC2_DIGEST_LENGTH; i++)
192        printf("%02X", md[i]);
193    printf("\n");
194}
195
196#endif
197