Experimental HMAC-SHA1 implementation

This adds experimental support for <cipher>+hmac-sha1 methods. It currently
depends on OpenSSL and is not yet ready for production use.

5 files changed, 144 insertions, 0 deletions

diff --git a/src/crypto/mac/CMakeLists.txt b/src/crypto/mac/CMakeLists.txt
index 971c04b..77c813b 100644
--- a/src/crypto/mac/CMakeLists.txt
+++ b/src/crypto/mac/CMakeLists.txt
@@ -60,6 +60,7 @@ endmacro(fastd_mac_impl_compile_flags)
 
 
 add_subdirectory(ghash)
+add_subdirectory(hmac_sha1)
 
 
 set(MAC_DEFINITIONS "")
diff --git a/src/crypto/mac/hmac_sha1/CMakeLists.txt b/src/crypto/mac/hmac_sha1/CMakeLists.txt
new file mode 100644
index 0000000..10f0d35
--- /dev/null
+++ b/src/crypto/mac/hmac_sha1/CMakeLists.txt
@@ -0,0 +1,2 @@
+fastd_mac(hmac-sha1 hmac_sha1.c)
+add_subdirectory(openssl)
diff --git a/src/crypto/mac/hmac_sha1/hmac_sha1.c b/src/crypto/mac/hmac_sha1/hmac_sha1.c
new file mode 100644
index 0000000..8d44017
--- /dev/null
+++ b/src/crypto/mac/hmac_sha1/hmac_sha1.c
@@ -0,0 +1,38 @@
+/*
+  Copyright (c) 2012-2014, 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.
+*/
+
+/**
+   \file
+
+   General information about the HMAC-SHA1 algorithm
+*/
+
+#include "../../../crypto.h"
+
+
+/** MAC info about the HMAC-SHA1 algorithm */
+const fastd_mac_info_t fastd_mac_info_hmac_sha1 = {
+	.key_length = 64,
+};
diff --git a/src/crypto/mac/hmac_sha1/openssl/CMakeLists.txt b/src/crypto/mac/hmac_sha1/openssl/CMakeLists.txt
new file mode 100644
index 0000000..cb08c58
--- /dev/null
+++ b/src/crypto/mac/hmac_sha1/openssl/CMakeLists.txt
@@ -0,0 +1,6 @@
+if(ENABLE_OPENSSL)
+  fastd_mac_impl(hmac-sha1 openssl
+    hmac_sha1_openssl.c
+  )
+  fastd_cipher_impl_include_directories(hmac-sha1 openssl ${OPENSSL_INCLUDE_DIRS})
+endif(ENABLE_OPENSSL)
diff --git a/src/crypto/mac/hmac_sha1/openssl/hmac_sha1_openssl.c b/src/crypto/mac/hmac_sha1/openssl/hmac_sha1_openssl.c
new file mode 100644
index 0000000..2e0c097
--- /dev/null
+++ b/src/crypto/mac/hmac_sha1/openssl/hmac_sha1_openssl.c
@@ -0,0 +1,97 @@
+/*
+  Copyright (c) 2012-2014, 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.
+*/
+
+/**
+   \file
+
+   Portable, table-based HMAC-SHA1 implementation
+*/
+
+
+#include "../../../../alloc.h"
+#include "../../../../crypto.h"
+
+#include <openssl/evp.h>
+
+
+/** The MAC state containing the OpenSSL digest context */
+struct fastd_mac_state {
+	EVP_PKEY *pkey;			/**< The OpenSSL private key */
+	EVP_MD_CTX *digest;		/**< The OpenSSL digest context */
+};
+
+
+/** Initializes the MAC state with the unpacked key data */
+static fastd_mac_state_t * hmac_sha1_init(const uint8_t *key) {
+	fastd_mac_state_t *state = fastd_new(fastd_mac_state_t);
+
+	state->digest = EVP_MD_CTX_create();
+	if (!state->digest)
+		exit_error("EVP_MD_CTX_create");
+
+	state->pkey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, key, 64);
+	if (!state->pkey)
+		exit_error("EVP_PKEY_new_mac_key");
+
+	return state;
+}
+
+/** Calculates the HMAC-SHA1 of the supplied blocks */
+static bool hmac_sha1_digest(const fastd_mac_state_t *state, fastd_block128_t *out, const fastd_block128_t *in, size_t length) {
+	if (!EVP_DigestSignInit(state->digest, NULL, EVP_sha1(), NULL, state->pkey))
+		return false;
+
+	if (!EVP_DigestSignUpdate(state->digest, (const unsigned char *)in, length))
+		return false;
+
+	unsigned char digest[EVP_MAX_MD_SIZE];
+	size_t digestlen = 0;
+
+	if (!EVP_DigestSignFinal(state->digest, digest, &digestlen))
+		return false;
+
+	if (digestlen != 20)
+		exit_bug("EVP_DigestSignFinal: invalid HMAC-SHA1 length");
+
+	memcpy(out, digest, sizeof(fastd_block128_t));
+
+	return true;
+}
+
+/** Frees the MAC state */
+static void hmac_sha1_free(fastd_mac_state_t *state) {
+	if (state) {
+		EVP_MD_CTX_destroy(state->digest);
+		EVP_PKEY_free(state->pkey);
+		free(state);
+	}
+}
+
+/** The OpenSSL-based HMAC-SHA1 implementation */
+const fastd_mac_t fastd_mac_hmac_sha1_openssl = {
+	.init = hmac_sha1_init,
+	.digest = hmac_sha1_digest,
+	.free = hmac_sha1_free,
+};