xref: /openssl/crypto/md2/md2_dgst.c (revision 33388b44)
1 /*
2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the Apache License 2.0 (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9 
10 /*
11  * MD2 low level APIs are deprecated for public use, but still ok for
12  * internal use.
13  */
14 #include "internal/deprecated.h"
15 
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <openssl/md2.h>
20 #include <openssl/opensslv.h>
21 #include <openssl/crypto.h>
22 
23 /*
24  * Implemented from RFC1319 The MD2 Message-Digest Algorithm
25  */
26 
27 #define UCHAR   unsigned char
28 
29 static void md2_block(MD2_CTX *c, const unsigned char *d);
30 /*
31  * The magic S table - I have converted it to hex since it is basically just
32  * a random byte string.
33  */
34 static const MD2_INT S[256] = {
35     0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01,
36     0x3D, 0x36, 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13,
37     0x62, 0xA7, 0x05, 0xF3, 0xC0, 0xC7, 0x73, 0x8C,
38     0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C, 0x82, 0xCA,
39     0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
40     0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12,
41     0xBE, 0x4E, 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49,
42     0xA0, 0xFB, 0xF5, 0x8E, 0xBB, 0x2F, 0xEE, 0x7A,
43     0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2, 0x07, 0x3F,
44     0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
45     0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27,
46     0x35, 0x3E, 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03,
47     0xFF, 0x19, 0x30, 0xB3, 0x48, 0xA5, 0xB5, 0xD1,
48     0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56, 0xAA, 0xC6,
49     0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
50     0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1,
51     0x45, 0x9D, 0x70, 0x59, 0x64, 0x71, 0x87, 0x20,
52     0x86, 0x5B, 0xCF, 0x65, 0xE6, 0x2D, 0xA8, 0x02,
53     0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0, 0xB9, 0xF6,
54     0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
55     0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A,
56     0xC3, 0x5C, 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26,
57     0x2C, 0x53, 0x0D, 0x6E, 0x85, 0x28, 0x84, 0x09,
58     0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81, 0x4D, 0x52,
59     0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
60     0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A,
61     0x78, 0x88, 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D,
62     0xE9, 0xCB, 0xD5, 0xFE, 0x3B, 0x00, 0x1D, 0x39,
63     0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58, 0xD0, 0xE4,
64     0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
65     0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A,
66     0xDB, 0x99, 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14,
67 };
68 
MD2_options(void)69 const char *MD2_options(void)
70 {
71     if (sizeof(MD2_INT) == 1)
72         return "md2(char)";
73     else
74         return "md2(int)";
75 }
76 
MD2_Init(MD2_CTX * c)77 int MD2_Init(MD2_CTX *c)
78 {
79     c->num = 0;
80     memset(c->state, 0, sizeof(c->state));
81     memset(c->cksm, 0, sizeof(c->cksm));
82     memset(c->data, 0, sizeof(c->data));
83     return 1;
84 }
85 
MD2_Update(MD2_CTX * c,const unsigned char * data,size_t len)86 int MD2_Update(MD2_CTX *c, const unsigned char *data, size_t len)
87 {
88     register UCHAR *p;
89 
90     if (len == 0)
91         return 1;
92 
93     p = c->data;
94     if (c->num != 0) {
95         if ((c->num + len) >= MD2_BLOCK) {
96             memcpy(&(p[c->num]), data, MD2_BLOCK - c->num);
97             md2_block(c, c->data);
98             data += (MD2_BLOCK - c->num);
99             len -= (MD2_BLOCK - c->num);
100             c->num = 0;
101             /* drop through and do the rest */
102         } else {
103             memcpy(&(p[c->num]), data, len);
104             /* data+=len; */
105             c->num += (int)len;
106             return 1;
107         }
108     }
109     /*
110      * we now can process the input data in blocks of MD2_BLOCK chars and
111      * save the leftovers to c->data.
112      */
113     while (len >= MD2_BLOCK) {
114         md2_block(c, data);
115         data += MD2_BLOCK;
116         len -= MD2_BLOCK;
117     }
118     memcpy(p, data, len);
119     c->num = (int)len;
120     return 1;
121 }
122 
md2_block(MD2_CTX * c,const unsigned char * d)123 static void md2_block(MD2_CTX *c, const unsigned char *d)
124 {
125     register MD2_INT t, *sp1, *sp2;
126     register int i, j;
127     MD2_INT state[48];
128 
129     sp1 = c->state;
130     sp2 = c->cksm;
131     j = sp2[MD2_BLOCK - 1];
132     for (i = 0; i < 16; i++) {
133         state[i] = sp1[i];
134         state[i + 16] = t = d[i];
135         state[i + 32] = (t ^ sp1[i]);
136         j = sp2[i] ^= S[t ^ j];
137     }
138     t = 0;
139     for (i = 0; i < 18; i++) {
140         for (j = 0; j < 48; j += 8) {
141             t = state[j + 0] ^= S[t];
142             t = state[j + 1] ^= S[t];
143             t = state[j + 2] ^= S[t];
144             t = state[j + 3] ^= S[t];
145             t = state[j + 4] ^= S[t];
146             t = state[j + 5] ^= S[t];
147             t = state[j + 6] ^= S[t];
148             t = state[j + 7] ^= S[t];
149         }
150         t = (t + i) & 0xff;
151     }
152     memcpy(sp1, state, 16 * sizeof(MD2_INT));
153     OPENSSL_cleanse(state, 48 * sizeof(MD2_INT));
154 }
155 
MD2_Final(unsigned char * md,MD2_CTX * c)156 int MD2_Final(unsigned char *md, MD2_CTX *c)
157 {
158     int i, v;
159     register UCHAR *cp;
160     register MD2_INT *p1, *p2;
161 
162     cp = c->data;
163     p1 = c->state;
164     p2 = c->cksm;
165     v = MD2_BLOCK - c->num;
166     for (i = c->num; i < MD2_BLOCK; i++)
167         cp[i] = (UCHAR) v;
168 
169     md2_block(c, cp);
170 
171     for (i = 0; i < MD2_BLOCK; i++)
172         cp[i] = (UCHAR) p2[i];
173     md2_block(c, cp);
174 
175     for (i = 0; i < 16; i++)
176         md[i] = (UCHAR) (p1[i] & 0xff);
177     OPENSSL_cleanse(c, sizeof(*c));
178     return 1;
179 }
180