From 3d00ddf2968711d071b537b27c3ec208b584cbdc Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Fri, 15 Nov 2013 21:52:45 +0100 Subject: Allow using blowfish from OpenSSL on systems where it's available anyways --- .../cipher/blowfish_ctr/openssl/blowfish_ctr.c | 113 +++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 src/crypto/cipher/blowfish_ctr/openssl/blowfish_ctr.c (limited to 'src/crypto/cipher/blowfish_ctr/openssl/blowfish_ctr.c') diff --git a/src/crypto/cipher/blowfish_ctr/openssl/blowfish_ctr.c b/src/crypto/cipher/blowfish_ctr/openssl/blowfish_ctr.c new file mode 100644 index 0000000..1eafb97 --- /dev/null +++ b/src/crypto/cipher/blowfish_ctr/openssl/blowfish_ctr.c @@ -0,0 +1,113 @@ +/* + Copyright (c) 2012-2013, Matthias Schiffer + All rights reserved. + + 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 above 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. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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. +*/ + + +#include "../../../../fastd.h" + +#include + + +struct fastd_cipher_state { + BF_KEY key; +}; + + +static fastd_cipher_context_t* blowfish_ctr_initialize(fastd_context_t *ctx UNUSED) { + return NULL; +} + +static size_t blowfish_ctr_key_length(fastd_context_t *ctx UNUSED, const fastd_cipher_context_t *cctx UNUSED) { + return 56; +} + +static inline void bf_ntohl(uint32_t *v, size_t len) { + size_t i; + for (i = 0; i < len; i++) + v[i] = ntohl(v[i]); +} + +static inline void bf_htonl(uint32_t *v, size_t len) { + size_t i; + for (i = 0; i < len; i++) + v[i] = htonl(v[i]); +} +static fastd_cipher_state_t* blowfish_ctr_init_state(fastd_context_t *ctx UNUSED, const fastd_cipher_context_t *cctx UNUSED, const uint8_t *key) { + fastd_cipher_state_t *state = malloc(sizeof(fastd_cipher_state_t)); + BF_set_key(&state->key, 56, (const unsigned char*)key); + + return state; +} + +static size_t blowfish_ctr_iv_length(fastd_context_t *ctx UNUSED, const fastd_cipher_state_t *state UNUSED) { + return 8; +} + +static bool blowfish_ctr_crypt(fastd_context_t *ctx UNUSED, const fastd_cipher_state_t *state, fastd_block128_t *out, const fastd_block128_t *in, size_t len, const uint8_t *iv) { + uint32_t ctr[2]; + + fastd_block128_t block; + uint32_t* block4 = (uint32_t*)█ + + memcpy(ctr, iv, sizeof(ctr)); + bf_ntohl(ctr, 2); + + size_t i; + for(i = 0; i < len; i += 16) { + memcpy(block4, ctr, sizeof(ctr)); + BF_encrypt((BF_LONG*)block4, &state->key); + ctr[1]++; + + memcpy(block4+2, ctr, sizeof(ctr)); + BF_encrypt((BF_LONG*)block4+2, &state->key); + ctr[1]++; + + bf_htonl(block4, 4); + xor(out++, in++, &block); + } + + return true; +} + +static void blowfish_ctr_free_state(fastd_context_t *ctx UNUSED, fastd_cipher_state_t *state) { + free(state); +} + +static void blowfish_ctr_free(fastd_context_t *ctx UNUSED, fastd_cipher_context_t *cctx UNUSED) { +} + +const fastd_cipher_t fastd_cipher_blowfish_ctr_openssl = { + .name = "openssl", + + .initialize = blowfish_ctr_initialize, + + .key_length = blowfish_ctr_key_length, + .init_state = blowfish_ctr_init_state, + + .iv_length = blowfish_ctr_iv_length, + .crypt = blowfish_ctr_crypt, + + .free_state = blowfish_ctr_free_state, + .free = blowfish_ctr_free, +}; -- cgit v1.2.3