bf_enc.c
4.47 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/blowfish.h>
#include "bf_locl.h"
/*
* Blowfish as implemented from 'Blowfish: Springer-Verlag paper' (From
* LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION, CAMBRIDGE
* SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
*/
#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
# error If you set BF_ROUNDS to some value other than 16 or 20, you will have \
to modify the code.
#endif
void BF_encrypt(BF_LONG *data, const BF_KEY *key)
{
register BF_LONG l, r;
register const BF_LONG *p, *s;
p = key->P;
s = &(key->S[0]);
l = data[0];
r = data[1];
l ^= p[0];
BF_ENC(r, l, s, p[1]);
BF_ENC(l, r, s, p[2]);
BF_ENC(r, l, s, p[3]);
BF_ENC(l, r, s, p[4]);
BF_ENC(r, l, s, p[5]);
BF_ENC(l, r, s, p[6]);
BF_ENC(r, l, s, p[7]);
BF_ENC(l, r, s, p[8]);
BF_ENC(r, l, s, p[9]);
BF_ENC(l, r, s, p[10]);
BF_ENC(r, l, s, p[11]);
BF_ENC(l, r, s, p[12]);
BF_ENC(r, l, s, p[13]);
BF_ENC(l, r, s, p[14]);
BF_ENC(r, l, s, p[15]);
BF_ENC(l, r, s, p[16]);
# if BF_ROUNDS == 20
BF_ENC(r, l, s, p[17]);
BF_ENC(l, r, s, p[18]);
BF_ENC(r, l, s, p[19]);
BF_ENC(l, r, s, p[20]);
# endif
r ^= p[BF_ROUNDS + 1];
data[1] = l & 0xffffffffU;
data[0] = r & 0xffffffffU;
}
void BF_decrypt(BF_LONG *data, const BF_KEY *key)
{
register BF_LONG l, r;
register const BF_LONG *p, *s;
p = key->P;
s = &(key->S[0]);
l = data[0];
r = data[1];
l ^= p[BF_ROUNDS + 1];
# if BF_ROUNDS == 20
BF_ENC(r, l, s, p[20]);
BF_ENC(l, r, s, p[19]);
BF_ENC(r, l, s, p[18]);
BF_ENC(l, r, s, p[17]);
# endif
BF_ENC(r, l, s, p[16]);
BF_ENC(l, r, s, p[15]);
BF_ENC(r, l, s, p[14]);
BF_ENC(l, r, s, p[13]);
BF_ENC(r, l, s, p[12]);
BF_ENC(l, r, s, p[11]);
BF_ENC(r, l, s, p[10]);
BF_ENC(l, r, s, p[9]);
BF_ENC(r, l, s, p[8]);
BF_ENC(l, r, s, p[7]);
BF_ENC(r, l, s, p[6]);
BF_ENC(l, r, s, p[5]);
BF_ENC(r, l, s, p[4]);
BF_ENC(l, r, s, p[3]);
BF_ENC(r, l, s, p[2]);
BF_ENC(l, r, s, p[1]);
r ^= p[0];
data[1] = l & 0xffffffffU;
data[0] = r & 0xffffffffU;
}
void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
const BF_KEY *schedule, unsigned char *ivec, int encrypt)
{
register BF_LONG tin0, tin1;
register BF_LONG tout0, tout1, xor0, xor1;
register long l = length;
BF_LONG tin[2];
if (encrypt) {
n2l(ivec, tout0);
n2l(ivec, tout1);
ivec -= 8;
for (l -= 8; l >= 0; l -= 8) {
n2l(in, tin0);
n2l(in, tin1);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
BF_encrypt(tin, schedule);
tout0 = tin[0];
tout1 = tin[1];
l2n(tout0, out);
l2n(tout1, out);
}
if (l != -8) {
n2ln(in, tin0, tin1, l + 8);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
BF_encrypt(tin, schedule);
tout0 = tin[0];
tout1 = tin[1];
l2n(tout0, out);
l2n(tout1, out);
}
l2n(tout0, ivec);
l2n(tout1, ivec);
} else {
n2l(ivec, xor0);
n2l(ivec, xor1);
ivec -= 8;
for (l -= 8; l >= 0; l -= 8) {
n2l(in, tin0);
n2l(in, tin1);
tin[0] = tin0;
tin[1] = tin1;
BF_decrypt(tin, schedule);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2n(tout0, out);
l2n(tout1, out);
xor0 = tin0;
xor1 = tin1;
}
if (l != -8) {
n2l(in, tin0);
n2l(in, tin1);
tin[0] = tin0;
tin[1] = tin1;
BF_decrypt(tin, schedule);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2nn(tout0, tout1, out, l + 8);
xor0 = tin0;
xor1 = tin1;
}
l2n(xor0, ivec);
l2n(xor1, ivec);
}
tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
tin[0] = tin[1] = 0;
}