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Diffstat (limited to 'src/libstrongswan/plugins/blowfish/blowfish_crypter.c')
| -rw-r--r-- | src/libstrongswan/plugins/blowfish/blowfish_crypter.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/blowfish/blowfish_crypter.c b/src/libstrongswan/plugins/blowfish/blowfish_crypter.c new file mode 100644 index 000000000..5064bfef6 --- /dev/null +++ b/src/libstrongswan/plugins/blowfish/blowfish_crypter.c @@ -0,0 +1,197 @@ +/* + * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include "blowfish.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) + */ + +#include "blowfish_crypter.h" + +typedef struct private_blowfish_crypter_t private_blowfish_crypter_t; + +/** + * Class implementing the Blowfish symmetric encryption algorithm. + * + * @ingroup crypters + */ +struct private_blowfish_crypter_t { + + /** + * Public part of this class. + */ + blowfish_crypter_t public; + + /** + * Blowfish key schedule + */ + BF_KEY schedule; + + /** + * Key size of this Blowfish cipher object. + */ + u_int32_t key_size; +}; + +/** + * Implementation of crypter_t.decrypt. + */ +static void decrypt(private_blowfish_crypter_t *this, chunk_t data, chunk_t iv, + chunk_t *decrypted) +{ + u_int8_t *in, *out; + + if (decrypted) + { + *decrypted = chunk_alloc(data.len); + out = decrypted->ptr; + } + else + { + out = data.ptr; + } + in = data.ptr; + iv = chunk_clone(iv); + + BF_cbc_encrypt(in, out, data.len, &this->schedule, iv.ptr, 0); + + free(iv.ptr); +} + +/** + * Implementation of crypter_t.decrypt. + */ +static void encrypt (private_blowfish_crypter_t *this, chunk_t data, chunk_t iv, + chunk_t *encrypted) +{ + u_int8_t *in, *out; + + if (encrypted) + { + *encrypted = chunk_alloc(data.len); + out = encrypted->ptr; + } + else + { + out = data.ptr; + } + in = data.ptr; + iv = chunk_clone(iv); + + BF_cbc_encrypt(in, out, data.len, &this->schedule, iv.ptr, 1); + + free(iv.ptr); +} + +/** + * Implementation of crypter_t.get_block_size. + */ +static size_t get_block_size (private_blowfish_crypter_t *this) +{ + return BLOWFISH_BLOCK_SIZE; +} + +/** + * Implementation of crypter_t.get_key_size. + */ +static size_t get_key_size (private_blowfish_crypter_t *this) +{ + return this->key_size; +} + +/** + * Implementation of crypter_t.set_key. + */ +static void set_key (private_blowfish_crypter_t *this, chunk_t key) +{ + BF_set_key(&this->schedule, key.len , key.ptr); +} + +/** + * Implementation of crypter_t.destroy and blowfish_crypter_t.destroy. + */ +static void destroy (private_blowfish_crypter_t *this) +{ + free(this); +} + +/* + * Described in header + */ +blowfish_crypter_t *blowfish_crypter_create(encryption_algorithm_t algo, size_t key_size) +{ + private_blowfish_crypter_t *this; + + if (algo != ENCR_BLOWFISH) + { + return NULL; + } + + this = malloc_thing(private_blowfish_crypter_t); + + this->key_size = key_size; + this->public.crypter_interface.encrypt = (void (*) (crypter_t *, chunk_t,chunk_t, chunk_t *)) encrypt; + this->public.crypter_interface.decrypt = (void (*) (crypter_t *, chunk_t , chunk_t, chunk_t *)) decrypt; + this->public.crypter_interface.get_block_size = (size_t (*) (crypter_t *)) get_block_size; + this->public.crypter_interface.get_key_size = (size_t (*) (crypter_t *)) get_key_size; + this->public.crypter_interface.set_key = (void (*) (crypter_t *,chunk_t)) set_key; + this->public.crypter_interface.destroy = (void (*) (crypter_t *)) destroy; + + return &(this->public); +} |