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/crypto.h>
20 #include <openssl/des.h>
21 #include <openssl/mdc2.h>
22
23 #undef c2l
24 #define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
25 l|=((DES_LONG)(*((c)++)))<< 8L, \
26 l|=((DES_LONG)(*((c)++)))<<16L, \
27 l|=((DES_LONG)(*((c)++)))<<24L)
28
29 #undef l2c
30 #define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
31 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
32 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
33 *((c)++)=(unsigned char)(((l)>>24L)&0xff))
34
35 static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len);
MDC2_Init(MDC2_CTX * c)36 int MDC2_Init(MDC2_CTX *c)
37 {
38 c->num = 0;
39 c->pad_type = 1;
40 memset(&(c->h[0]), 0x52, MDC2_BLOCK);
41 memset(&(c->hh[0]), 0x25, MDC2_BLOCK);
42 return 1;
43 }
44
MDC2_Update(MDC2_CTX * c,const unsigned char * in,size_t len)45 int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)
46 {
47 size_t i, j;
48
49 i = c->num;
50 if (i != 0) {
51 if (len < MDC2_BLOCK - i) {
52 /* partial block */
53 memcpy(&(c->data[i]), in, len);
54 c->num += (int)len;
55 return 1;
56 } else {
57 /* filled one */
58 j = MDC2_BLOCK - i;
59 memcpy(&(c->data[i]), in, j);
60 len -= j;
61 in += j;
62 c->num = 0;
63 mdc2_body(c, &(c->data[0]), MDC2_BLOCK);
64 }
65 }
66 i = len & ~((size_t)MDC2_BLOCK - 1);
67 if (i > 0)
68 mdc2_body(c, in, i);
69 j = len - i;
70 if (j > 0) {
71 memcpy(&(c->data[0]), &(in[i]), j);
72 c->num = (int)j;
73 }
74 return 1;
75 }
76
mdc2_body(MDC2_CTX * c,const unsigned char * in,size_t len)77 static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)
78 {
79 register DES_LONG tin0, tin1;
80 register DES_LONG ttin0, ttin1;
81 DES_LONG d[2], dd[2];
82 DES_key_schedule k;
83 unsigned char *p;
84 size_t i;
85
86 for (i = 0; i < len; i += 8) {
87 c2l(in, tin0);
88 d[0] = dd[0] = tin0;
89 c2l(in, tin1);
90 d[1] = dd[1] = tin1;
91 c->h[0] = (c->h[0] & 0x9f) | 0x40;
92 c->hh[0] = (c->hh[0] & 0x9f) | 0x20;
93
94 DES_set_odd_parity(&c->h);
95 DES_set_key_unchecked(&c->h, &k);
96 DES_encrypt1(d, &k, 1);
97
98 DES_set_odd_parity(&c->hh);
99 DES_set_key_unchecked(&c->hh, &k);
100 DES_encrypt1(dd, &k, 1);
101
102 ttin0 = tin0 ^ dd[0];
103 ttin1 = tin1 ^ dd[1];
104 tin0 ^= d[0];
105 tin1 ^= d[1];
106
107 p = c->h;
108 l2c(tin0, p);
109 l2c(ttin1, p);
110 p = c->hh;
111 l2c(ttin0, p);
112 l2c(tin1, p);
113 }
114 }
115
MDC2_Final(unsigned char * md,MDC2_CTX * c)116 int MDC2_Final(unsigned char *md, MDC2_CTX *c)
117 {
118 unsigned int i;
119 int j;
120
121 i = c->num;
122 j = c->pad_type;
123 if ((i > 0) || (j == 2)) {
124 if (j == 2)
125 c->data[i++] = 0x80;
126 memset(&(c->data[i]), 0, MDC2_BLOCK - i);
127 mdc2_body(c, c->data, MDC2_BLOCK);
128 }
129 memcpy(md, (char *)c->h, MDC2_BLOCK);
130 memcpy(&(md[MDC2_BLOCK]), (char *)c->hh, MDC2_BLOCK);
131 return 1;
132 }
133