Allow using blowfish from OpenSSL on systems where it's available anyways

1 files changed, 113 insertions, 0 deletions

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 <mschiffer@universe-factory.net>
+  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 <openssl/blowfish.h>
+
+
+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*)&block;
+
+	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,
+};