1 /* md2.c
2  *
3  * Copyright (C) 2006-2021 wolfSSL Inc.
4  *
5  * This file is part of wolfSSL.
6  *
7  * wolfSSL is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * wolfSSL is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
20  */
21 
22 
23 
24 #ifdef HAVE_CONFIG_H
25     #include <config.h>
26 #endif
27 
28 #include <wolfssl/wolfcrypt/settings.h>
29 
30 #ifdef WOLFSSL_MD2
31 
32 #include <wolfssl/wolfcrypt/md2.h>
33 #include <wolfssl/wolfcrypt/error-crypt.h>
34 
35 #ifdef NO_INLINE
36     #include <wolfssl/wolfcrypt/misc.h>
37 #else
38     #define WOLFSSL_MISC_INCLUDED
39     #include <wolfcrypt/src/misc.c>
40 #endif
41 
42 
wc_InitMd2(Md2 * md2)43 void wc_InitMd2(Md2* md2)
44 {
45     XMEMSET(md2->X, 0, MD2_X_SIZE);
46     XMEMSET(md2->C, 0, MD2_BLOCK_SIZE);
47     XMEMSET(md2->buffer, 0, MD2_BLOCK_SIZE);
48     md2->count = 0;
49 }
50 
51 
wc_Md2Update(Md2 * md2,const byte * data,word32 len)52 void wc_Md2Update(Md2* md2, const byte* data, word32 len)
53 {
54     static const byte S[256] =
55     {
56         41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
57         19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
58         76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
59         138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
60         245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
61         148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
62         39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
63         181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
64         150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
65         112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
66         96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
67         85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
68         234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
69         129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
70         8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
71         203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
72         166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
73         31, 26, 219, 153, 141, 51, 159, 17, 131, 20
74     };
75 
76     while (len) {
77         word32 L = (MD2_PAD_SIZE - md2->count) < len ?
78                    (MD2_PAD_SIZE - md2->count) : len;
79         XMEMCPY(md2->buffer + md2->count, data, L);
80         md2->count += L;
81         data += L;
82         len  -= L;
83 
84         if (md2->count == MD2_PAD_SIZE) {
85             int  i;
86             byte t;
87 
88             md2->count = 0;
89             XMEMCPY(md2->X + MD2_PAD_SIZE, md2->buffer, MD2_PAD_SIZE);
90             t = md2->C[15];
91 
92             for(i = 0; i < MD2_PAD_SIZE; i++) {
93                 md2->X[32 + i] = md2->X[MD2_PAD_SIZE + i] ^ md2->X[i];
94                 t = md2->C[i] ^= S[md2->buffer[i] ^ t];
95             }
96 
97             t=0;
98             for(i = 0; i < 18; i++) {
99                 int j;
100                 for(j = 0; j < MD2_X_SIZE; j += 8) {
101                     t = md2->X[j+0] ^= S[t];
102                     t = md2->X[j+1] ^= S[t];
103                     t = md2->X[j+2] ^= S[t];
104                     t = md2->X[j+3] ^= S[t];
105                     t = md2->X[j+4] ^= S[t];
106                     t = md2->X[j+5] ^= S[t];
107                     t = md2->X[j+6] ^= S[t];
108                     t = md2->X[j+7] ^= S[t];
109                 }
110                 t = (t + i) & 0xFF;
111             }
112         }
113     }
114 }
115 
116 
wc_Md2Final(Md2 * md2,byte * hash)117 void wc_Md2Final(Md2* md2, byte* hash)
118 {
119     byte   padding[MD2_BLOCK_SIZE];
120     word32 padLen = MD2_PAD_SIZE - md2->count;
121     word32 i;
122 
123     for (i = 0; i < padLen; i++)
124         padding[i] = (byte)padLen;
125 
126     wc_Md2Update(md2, padding, padLen);
127     wc_Md2Update(md2, md2->C, MD2_BLOCK_SIZE);
128 
129     XMEMCPY(hash, md2->X, MD2_DIGEST_SIZE);
130 
131     wc_InitMd2(md2);
132 }
133 
134 
wc_Md2Hash(const byte * data,word32 len,byte * hash)135 int wc_Md2Hash(const byte* data, word32 len, byte* hash)
136 {
137 #ifdef WOLFSSL_SMALL_STACK
138     Md2* md2;
139 #else
140     Md2 md2[1];
141 #endif
142 
143 #ifdef WOLFSSL_SMALL_STACK
144     md2 = (Md2*)XMALLOC(sizeof(Md2), NULL, DYNAMIC_TYPE_TMP_BUFFER);
145     if (md2 == NULL)
146         return MEMORY_E;
147 #endif
148 
149     wc_InitMd2(md2);
150     wc_Md2Update(md2, data, len);
151     wc_Md2Final(md2, hash);
152 
153 #ifdef WOLFSSL_SMALL_STACK
154     XFREE(md2, NULL, DYNAMIC_TYPE_TMP_BUFFER);
155 #endif
156 
157     return 0;
158 }
159 
160 
161 #endif /* WOLFSSL_MD2 */
162 
163