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d36ae9e3 AS |
1 | /* |
2 | * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
7daf5226 | 7 | * |
d36ae9e3 | 8 | * This library is free for commercial and non-commercial use as long as |
2db6d5b8 | 9 | * the following conditions are adhered to. The following conditions |
d36ae9e3 AS |
10 | * apply to all code found in this distribution, be it the RC4, RSA, |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
7daf5226 | 14 | * |
d36ae9e3 AS |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
7daf5226 | 21 | * |
d36ae9e3 AS |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
2db6d5b8 | 34 | * The word 'cryptographic' can be left out if the routines from the library |
d36ae9e3 | 35 | * being used are not cryptographic related :-). |
7daf5226 | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d36ae9e3 AS |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
7daf5226 | 39 | * |
d36ae9e3 AS |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
7daf5226 | 51 | * |
d36ae9e3 AS |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | ||
58 | #include "blowfish.h" | |
d36ae9e3 AS |
59 | |
60 | /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper' | |
61 | * (From LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION, | |
62 | * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993) | |
63 | */ | |
7daf5226 | 64 | |
d36ae9e3 AS |
65 | #include "blowfish_crypter.h" |
66 | ||
d36ae9e3 AS |
67 | typedef struct private_blowfish_crypter_t private_blowfish_crypter_t; |
68 | ||
69 | /** | |
70 | * Class implementing the Blowfish symmetric encryption algorithm. | |
d36ae9e3 AS |
71 | */ |
72 | struct private_blowfish_crypter_t { | |
7daf5226 | 73 | |
d36ae9e3 AS |
74 | /** |
75 | * Public part of this class. | |
76 | */ | |
77 | blowfish_crypter_t public; | |
7daf5226 | 78 | |
d36ae9e3 | 79 | /** |
28ef27bf | 80 | * Blowfish key schedule |
d36ae9e3 | 81 | */ |
28ef27bf | 82 | BF_KEY schedule; |
d36ae9e3 | 83 | |
d36ae9e3 | 84 | /** |
42dd3303 | 85 | * Key size of this Blowfish cipher object. |
d36ae9e3 | 86 | */ |
b12c53ce | 87 | uint32_t key_size; |
d36ae9e3 AS |
88 | }; |
89 | ||
3b96189a | 90 | METHOD(crypter_t, decrypt, bool, |
00c7e9af MW |
91 | private_blowfish_crypter_t *this, chunk_t data, chunk_t iv, |
92 | chunk_t *decrypted) | |
d36ae9e3 | 93 | { |
b12c53ce | 94 | uint8_t *in, *out; |
7daf5226 | 95 | |
d36ae9e3 AS |
96 | if (decrypted) |
97 | { | |
98 | *decrypted = chunk_alloc(data.len); | |
99 | out = decrypted->ptr; | |
100 | } | |
101 | else | |
102 | { | |
103 | out = data.ptr; | |
104 | } | |
105 | in = data.ptr; | |
7eea232f | 106 | iv = chunk_clone(iv); |
d36ae9e3 | 107 | |
7eea232f AS |
108 | BF_cbc_encrypt(in, out, data.len, &this->schedule, iv.ptr, 0); |
109 | ||
110 | free(iv.ptr); | |
3b96189a MW |
111 | |
112 | return TRUE; | |
28ef27bf | 113 | } |
d36ae9e3 | 114 | |
e35abbe5 | 115 | METHOD(crypter_t, encrypt, bool, |
00c7e9af MW |
116 | private_blowfish_crypter_t *this, chunk_t data, chunk_t iv, |
117 | chunk_t *encrypted) | |
d36ae9e3 | 118 | { |
b12c53ce | 119 | uint8_t *in, *out; |
7daf5226 | 120 | |
d36ae9e3 AS |
121 | if (encrypted) |
122 | { | |
123 | *encrypted = chunk_alloc(data.len); | |
124 | out = encrypted->ptr; | |
125 | } | |
28ef27bf | 126 | else |
d36ae9e3 | 127 | { |
28ef27bf | 128 | out = data.ptr; |
d36ae9e3 | 129 | } |
28ef27bf | 130 | in = data.ptr; |
7eea232f AS |
131 | iv = chunk_clone(iv); |
132 | ||
133 | BF_cbc_encrypt(in, out, data.len, &this->schedule, iv.ptr, 1); | |
28ef27bf | 134 | |
7eea232f | 135 | free(iv.ptr); |
e35abbe5 MW |
136 | |
137 | return TRUE; | |
d36ae9e3 AS |
138 | } |
139 | ||
00c7e9af MW |
140 | METHOD(crypter_t, get_block_size, size_t, |
141 | private_blowfish_crypter_t *this) | |
d36ae9e3 AS |
142 | { |
143 | return BLOWFISH_BLOCK_SIZE; | |
144 | } | |
145 | ||
f7c04c5b MW |
146 | METHOD(crypter_t, get_iv_size, size_t, |
147 | private_blowfish_crypter_t *this) | |
148 | { | |
149 | return BLOWFISH_BLOCK_SIZE; | |
150 | } | |
151 | ||
00c7e9af MW |
152 | METHOD(crypter_t, get_key_size, size_t, |
153 | private_blowfish_crypter_t *this) | |
d36ae9e3 AS |
154 | { |
155 | return this->key_size; | |
156 | } | |
157 | ||
ce73fc19 | 158 | METHOD(crypter_t, set_key, bool, |
00c7e9af | 159 | private_blowfish_crypter_t *this, chunk_t key) |
d36ae9e3 | 160 | { |
28ef27bf | 161 | BF_set_key(&this->schedule, key.len , key.ptr); |
ce73fc19 | 162 | return TRUE; |
d36ae9e3 AS |
163 | } |
164 | ||
00c7e9af MW |
165 | METHOD(crypter_t, destroy, void, |
166 | private_blowfish_crypter_t *this) | |
d36ae9e3 | 167 | { |
f7812f64 | 168 | memwipe(this, sizeof(*this)); |
d36ae9e3 AS |
169 | free(this); |
170 | } | |
171 | ||
172 | /* | |
173 | * Described in header | |
174 | */ | |
e2c3b482 MW |
175 | blowfish_crypter_t *blowfish_crypter_create(encryption_algorithm_t algo, |
176 | size_t key_size) | |
d36ae9e3 AS |
177 | { |
178 | private_blowfish_crypter_t *this; | |
7daf5226 | 179 | |
d36ae9e3 AS |
180 | if (algo != ENCR_BLOWFISH) |
181 | { | |
182 | return NULL; | |
183 | } | |
7daf5226 | 184 | |
00c7e9af | 185 | INIT(this, |
ba31fe1f MW |
186 | .public = { |
187 | .crypter = { | |
188 | .encrypt = _encrypt, | |
189 | .decrypt = _decrypt, | |
190 | .get_block_size = _get_block_size, | |
191 | .get_iv_size = _get_iv_size, | |
192 | .get_key_size = _get_key_size, | |
193 | .set_key = _set_key, | |
194 | .destroy = _destroy, | |
195 | }, | |
00c7e9af | 196 | }, |
e2c3b482 | 197 | .key_size = key_size ?: 16, |
00c7e9af MW |
198 | ); |
199 | ||
200 | return &this->public; | |
d36ae9e3 | 201 | } |