1/*
2 * Copyright 1995-2016 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#include <stdio.h>
11#include <stdlib.h>
12#include <string.h>
13#include <openssl/crypto.h>
14#include <openssl/des.h>
15#include <openssl/mdc2.h>
16
17#undef c2l
18#define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
19 l|=((DES_LONG)(*((c)++)))<< 8L, \
20 l|=((DES_LONG)(*((c)++)))<<16L, \
21 l|=((DES_LONG)(*((c)++)))<<24L)
22
23#undef l2c
24#define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
25 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
26 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
27 *((c)++)=(unsigned char)(((l)>>24L)&0xff))
28
29static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len);
30int MDC2_Init(MDC2_CTX *c)
31{
32 c->num = 0;
33 c->pad_type = 1;
34 memset(&(c->h[0]), 0x52, MDC2_BLOCK);
35 memset(&(c->hh[0]), 0x25, MDC2_BLOCK);
36 return 1;
37}
38
39int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)
40{
41 size_t i, j;
42
43 i = c->num;
44 if (i != 0) {
45 if (len < MDC2_BLOCK - i) {
46 /* partial block */
47 memcpy(&(c->data[i]), in, len);
48 c->num += (int)len;
49 return 1;
50 } else {
51 /* filled one */
52 j = MDC2_BLOCK - i;
53 memcpy(&(c->data[i]), in, j);
54 len -= j;
55 in += j;
56 c->num = 0;
57 mdc2_body(c, &(c->data[0]), MDC2_BLOCK);
58 }
59 }
60 i = len & ~((size_t)MDC2_BLOCK - 1);
61 if (i > 0)
62 mdc2_body(c, in, i);
63 j = len - i;
64 if (j > 0) {
65 memcpy(&(c->data[0]), &(in[i]), j);
66 c->num = (int)j;
67 }
68 return 1;
69}
70
71static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)
72{
73 register DES_LONG tin0, tin1;
74 register DES_LONG ttin0, ttin1;
75 DES_LONG d[2], dd[2];
76 DES_key_schedule k;
77 unsigned char *p;
78 size_t i;
79
80 for (i = 0; i < len; i += 8) {
81 c2l(in, tin0);
82 d[0] = dd[0] = tin0;
83 c2l(in, tin1);
84 d[1] = dd[1] = tin1;
85 c->h[0] = (c->h[0] & 0x9f) | 0x40;
86 c->hh[0] = (c->hh[0] & 0x9f) | 0x20;
87
88 DES_set_odd_parity(&c->h);
89 DES_set_key_unchecked(&c->h, &k);
90 DES_encrypt1(d, &k, 1);
91
92 DES_set_odd_parity(&c->hh);
93 DES_set_key_unchecked(&c->hh, &k);
94 DES_encrypt1(dd, &k, 1);
95
96 ttin0 = tin0 ^ dd[0];
97 ttin1 = tin1 ^ dd[1];
98 tin0 ^= d[0];
99 tin1 ^= d[1];
100
101 p = c->h;
102 l2c(tin0, p);
103 l2c(ttin1, p);
104 p = c->hh;
105 l2c(ttin0, p);
106 l2c(tin1, p);
107 }
108}
109
110int MDC2_Final(unsigned char *md, MDC2_CTX *c)
111{
112 unsigned int i;
113 int j;
114
115 i = c->num;
116 j = c->pad_type;
117 if ((i > 0) || (j == 2)) {
118 if (j == 2)
119 c->data[i++] = 0x80;
120 memset(&(c->data[i]), 0, MDC2_BLOCK - i);
121 mdc2_body(c, c->data, MDC2_BLOCK);
122 }
123 memcpy(md, (char *)c->h, MDC2_BLOCK);
124 memcpy(&(md[MDC2_BLOCK]), (char *)c->hh, MDC2_BLOCK);
125 return 1;
126}
127