198 lines
6.0 KiB
C
198 lines
6.0 KiB
C
/*
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* Copyright (C) 1995-1998 Eric Young ([email protected])
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*
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* This package is an SSL implementation written
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* by Eric Young ([email protected]).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson ([email protected]).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young ([email protected])"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson ([email protected])"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include "blowfish.h"
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/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
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* (From LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
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* CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
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*/
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#include "blowfish_crypter.h"
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typedef struct private_blowfish_crypter_t private_blowfish_crypter_t;
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/**
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* Class implementing the Blowfish symmetric encryption algorithm.
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*
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* @ingroup crypters
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*/
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struct private_blowfish_crypter_t {
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/**
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* Public part of this class.
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*/
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blowfish_crypter_t public;
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/**
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* Blowfish key schedule
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*/
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BF_KEY schedule;
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/**
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* Key size of this Blowfish cipher object.
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*/
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u_int32_t key_size;
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};
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/**
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* Implementation of crypter_t.decrypt.
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*/
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static void decrypt(private_blowfish_crypter_t *this, chunk_t data, chunk_t iv,
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chunk_t *decrypted)
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{
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u_int8_t *in, *out;
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if (decrypted)
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{
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*decrypted = chunk_alloc(data.len);
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out = decrypted->ptr;
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}
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else
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{
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out = data.ptr;
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}
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in = data.ptr;
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iv = chunk_clone(iv);
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BF_cbc_encrypt(in, out, data.len, &this->schedule, iv.ptr, 0);
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free(iv.ptr);
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}
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/**
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* Implementation of crypter_t.decrypt.
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*/
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static void encrypt (private_blowfish_crypter_t *this, chunk_t data, chunk_t iv,
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chunk_t *encrypted)
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{
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u_int8_t *in, *out;
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if (encrypted)
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{
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*encrypted = chunk_alloc(data.len);
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out = encrypted->ptr;
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}
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else
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{
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out = data.ptr;
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}
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in = data.ptr;
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iv = chunk_clone(iv);
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BF_cbc_encrypt(in, out, data.len, &this->schedule, iv.ptr, 1);
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free(iv.ptr);
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}
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/**
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* Implementation of crypter_t.get_block_size.
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*/
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static size_t get_block_size (private_blowfish_crypter_t *this)
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{
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return BLOWFISH_BLOCK_SIZE;
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}
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/**
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* Implementation of crypter_t.get_key_size.
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*/
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static size_t get_key_size (private_blowfish_crypter_t *this)
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{
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return this->key_size;
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}
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/**
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* Implementation of crypter_t.set_key.
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*/
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static void set_key (private_blowfish_crypter_t *this, chunk_t key)
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{
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BF_set_key(&this->schedule, key.len , key.ptr);
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}
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/**
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* Implementation of crypter_t.destroy and blowfish_crypter_t.destroy.
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*/
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static void destroy (private_blowfish_crypter_t *this)
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{
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free(this);
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}
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/*
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* Described in header
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*/
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blowfish_crypter_t *blowfish_crypter_create(encryption_algorithm_t algo, size_t key_size)
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{
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private_blowfish_crypter_t *this;
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if (algo != ENCR_BLOWFISH)
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{
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return NULL;
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}
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this = malloc_thing(private_blowfish_crypter_t);
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this->key_size = key_size;
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this->public.crypter_interface.encrypt = (void (*) (crypter_t *, chunk_t,chunk_t, chunk_t *)) encrypt;
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this->public.crypter_interface.decrypt = (void (*) (crypter_t *, chunk_t , chunk_t, chunk_t *)) decrypt;
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this->public.crypter_interface.get_block_size = (size_t (*) (crypter_t *)) get_block_size;
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this->public.crypter_interface.get_key_size = (size_t (*) (crypter_t *)) get_key_size;
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this->public.crypter_interface.set_key = (void (*) (crypter_t *,chunk_t)) set_key;
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this->public.crypter_interface.destroy = (void (*) (crypter_t *)) destroy;
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return &(this->public);
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}
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