From ba5abca808dc85e2de2e11351832329f1566bc7e Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Wed, 27 Nov 2013 20:28:16 +0100
Subject: Add OpenSSL-based aes128-ctr implementation

---
 src/crypto/cipher/aes128_ctr/CMakeLists.txt        |  1 +
 .../cipher/aes128_ctr/openssl/CMakeLists.txt       |  6 ++
 .../cipher/aes128_ctr/openssl/aes128_ctr_openssl.c | 85 ++++++++++++++++++++++
 3 files changed, 92 insertions(+)
 create mode 100644 src/crypto/cipher/aes128_ctr/openssl/CMakeLists.txt
 create mode 100644 src/crypto/cipher/aes128_ctr/openssl/aes128_ctr_openssl.c

diff --git a/src/crypto/cipher/aes128_ctr/CMakeLists.txt b/src/crypto/cipher/aes128_ctr/CMakeLists.txt
index 27b507b..0588fed 100644
--- a/src/crypto/cipher/aes128_ctr/CMakeLists.txt
+++ b/src/crypto/cipher/aes128_ctr/CMakeLists.txt
@@ -1,2 +1,3 @@
 fastd_cipher(aes128-ctr aes128_ctr.c)
+add_subdirectory(openssl)
 add_subdirectory(nacl)
diff --git a/src/crypto/cipher/aes128_ctr/openssl/CMakeLists.txt b/src/crypto/cipher/aes128_ctr/openssl/CMakeLists.txt
new file mode 100644
index 0000000..5454b3f
--- /dev/null
+++ b/src/crypto/cipher/aes128_ctr/openssl/CMakeLists.txt
@@ -0,0 +1,6 @@
+if(USE_OPENSSL)
+  fastd_cipher_impl(aes128-ctr openssl
+    aes128_ctr_openssl.c
+  )
+  fastd_cipher_impl_include_directories(aes128-ctr openssl ${OPENSSL_INCLUDE_DIRS})
+endif(USE_OPENSSL)
diff --git a/src/crypto/cipher/aes128_ctr/openssl/aes128_ctr_openssl.c b/src/crypto/cipher/aes128_ctr/openssl/aes128_ctr_openssl.c
new file mode 100644
index 0000000..3ab12d5
--- /dev/null
+++ b/src/crypto/cipher/aes128_ctr/openssl/aes128_ctr_openssl.c
@@ -0,0 +1,85 @@
+/*
+  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 "../../../../crypto.h"
+#include <openssl/evp.h>
+
+
+struct __attribute__((aligned(16))) fastd_cipher_state {
+	EVP_CIPHER_CTX *aes;
+};
+
+
+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 UNUSED, const fastd_cipher_context_t *cctx UNUSED, const uint8_t *key) {
+	fastd_cipher_state_t *state = malloc(sizeof(fastd_cipher_state_t));
+
+	state->aes = EVP_CIPHER_CTX_new();
+	EVP_EncryptInit(state->aes, EVP_aes_128_ctr(), (const void*)key, NULL);
+
+	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 uint8_t *iv) {
+	int clen, clen2;
+
+	if (!EVP_EncryptInit(state->aes, NULL, NULL, iv))
+		return false;
+
+	if (!EVP_EncryptUpdate(state->aes, (void*)out, &clen, (const void*)in, len))
+		return false;
+
+	if (!EVP_EncryptFinal(state->aes, ((void*)out) + clen, &clen2))
+		return false;
+
+	if ((size_t)(clen+clen2) != len)
+		return false;
+
+	return true;
+}
+
+static void aes128_ctr_free_state(fastd_context_t *ctx UNUSED, fastd_cipher_state_t *state) {
+	if (state) {
+		EVP_CIPHER_CTX_free(state->aes);
+		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_openssl = {
+	.initialize = aes128_ctr_initialize,
+	.init_state = aes128_ctr_init_state,
+
+	.crypt = aes128_ctr_crypt,
+
+	.free_state = aes128_ctr_free_state,
+	.free = aes128_ctr_free,
+};
-- 
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