Implement the first step towards a more flexible way to support crypto methods

1 files changed, 76 insertions, 0 deletions

diff --git a/src/crypto/cipher/aes128_ctr/nacl/cipher_aes128_ctr_nacl.c b/src/crypto/cipher/aes128_ctr/nacl/cipher_aes128_ctr_nacl.c
new file mode 100644
index 0000000..f63e46f
--- /dev/null
+++ b/src/crypto/cipher/aes128_ctr/nacl/cipher_aes128_ctr_nacl.c
@@ -0,0 +1,76 @@
+/*
+  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 <crypto_stream_aes128ctr.h>
+
+
+struct fastd_cipher_state {
+	fastd_buffer_t d;
+};
+
+
+static fastd_cipher_context_t* aes128_ctr_initialize(fastd_context_t *ctx UNUSED) {
+	return NULL;
+}
+
+static fastd_cipher_state_t* aes128_ctr_init_state(fastd_context_t *ctx, const fastd_cipher_context_t *cctx UNUSED, const uint8_t *key) {
+	fastd_block128_t k;
+	memcpy(k.b, key, sizeof(fastd_block128_t));
+
+	fastd_cipher_state_t *state = malloc(sizeof(fastd_cipher_state_t));
+
+	state->d = fastd_buffer_alloc(ctx, crypto_stream_aes128ctr_BEFORENMBYTES, 0, 0);
+	crypto_stream_aes128ctr_beforenm(state->d.data, k.b);
+
+	return state;
+}
+
+static bool aes128_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 fastd_block128_t *iv) {
+	crypto_stream_aes128ctr_xor_afternm(out->b, in->b, len, iv->b, state->d.data);
+	return true;
+}
+
+static void aes128_ctr_free_state(fastd_context_t *ctx UNUSED, fastd_cipher_state_t *state) {
+	if (state) {
+		fastd_buffer_free(state->d);
+		free(state);
+	}
+}
+
+static void aes128_ctr_free(fastd_context_t *ctx UNUSED, fastd_cipher_context_t *cctx UNUSED) {
+}
+
+const fastd_cipher_t fastd_cipher_aes128_ctr_nacl = {
+	.name = "nacl",
+
+	.initialize = aes128_ctr_initialize,
+	.init_state = aes128_ctr_init_state,
+	.crypt = aes128_ctr_crypt,
+
+	.free_state = aes128_ctr_free_state,
+	.free = aes128_ctr_free,
+};