2 * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
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).
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.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
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)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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
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.]
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)
65 #include "blowfish_crypter.h"
67 #define BLOWFISH_BLOCK_SIZE 16
69 typedef struct private_blowfish_crypter_t private_blowfish_crypter_t
;
72 * Class implementing the Blowfish symmetric encryption algorithm.
76 struct private_blowfish_crypter_t
{
79 * Public part of this class.
81 blowfish_crypter_t
public;
84 * Blowfish key schedule
89 * Key size of this Blowfish cipher object.
95 * Implementation of crypter_t.decrypt.
97 static void decrypt(private_blowfish_crypter_t
*this, chunk_t data
, chunk_t iv
,
104 *decrypted
= chunk_alloc(data
.len
);
105 out
= decrypted
->ptr
;
113 BF_cbc_encrypt(in
, out
, data
.len
, &this->schedule
, iv
.ptr
, FALSE
);
117 * Implementation of crypter_t.decrypt.
119 static void encrypt (private_blowfish_crypter_t
*this, chunk_t data
, chunk_t iv
,
126 *encrypted
= chunk_alloc(data
.len
);
127 out
= encrypted
->ptr
;
135 BF_cbc_encrypt(in
, out
, data
.len
, &this->schedule
, iv
.ptr
, TRUE
);
139 * Implementation of crypter_t.get_block_size.
141 static size_t get_block_size (private_blowfish_crypter_t
*this)
143 return BLOWFISH_BLOCK_SIZE
;
147 * Implementation of crypter_t.get_key_size.
149 static size_t get_key_size (private_blowfish_crypter_t
*this)
151 return this->key_size
;
155 * Implementation of crypter_t.set_key.
157 static void set_key (private_blowfish_crypter_t
*this, chunk_t key
)
159 BF_set_key(&this->schedule
, key
.len
, key
.ptr
);
163 * Implementation of crypter_t.destroy and blowfish_crypter_t.destroy.
165 static void destroy (private_blowfish_crypter_t
*this)
171 * Described in header
173 blowfish_crypter_t
*blowfish_crypter_create(encryption_algorithm_t algo
, size_t key_size
)
175 private_blowfish_crypter_t
*this;
177 if (algo
!= ENCR_BLOWFISH
)
182 this = malloc_thing(private_blowfish_crypter_t
);
184 this->key_size
= key_size
;
185 this->public.crypter_interface
.encrypt
= (void (*) (crypter_t
*, chunk_t
,chunk_t
, chunk_t
*)) encrypt
;
186 this->public.crypter_interface
.decrypt
= (void (*) (crypter_t
*, chunk_t
, chunk_t
, chunk_t
*)) decrypt
;
187 this->public.crypter_interface
.get_block_size
= (size_t (*) (crypter_t
*)) get_block_size
;
188 this->public.crypter_interface
.get_key_size
= (size_t (*) (crypter_t
*)) get_key_size
;
189 this->public.crypter_interface
.set_key
= (void (*) (crypter_t
*,chunk_t
)) set_key
;
190 this->public.crypter_interface
.destroy
= (void (*) (crypter_t
*)) destroy
;
192 return &(this->public);