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