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/*
* 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);
}
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