Implemented hasher based on AF_ALG

src/libstrongswan/plugins/af_alg/Makefile.am

@@ -1,5 +1,5 @@
 
-INCLUDES = -I$(top_srcdir)/src/libstrongswan
+INCLUDES = -I${linux_headers} -I$(top_srcdir)/src/libstrongswan
 
 AM_CFLAGS = -rdynamic
 
@@ -10,6 +10,7 @@ plugin_LTLIBRARIES = libstrongswan-af-alg.la
 endif
 
 libstrongswan_af_alg_la_SOURCES = \
-	af_alg_plugin.h af_alg_plugin.c
+	af_alg_plugin.h af_alg_plugin.c \
+	af_alg_hasher.h af_alg_hasher.c
 
 libstrongswan_af_alg_la_LDFLAGS = -module -avoid-version

src/libstrongswan/plugins/af_alg/af_alg_hasher.c

@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "af_alg_hasher.h"
+
+#include <unistd.h>
+#include <errno.h>
+#include <linux/socket.h>
+#include <linux/if_alg.h>
+
+#include <debug.h>
+
+#ifndef AF_ALG
+#define AF_ALG		38
+#endif /* AF_ALG */
+
+typedef struct private_af_alg_hasher_t private_af_alg_hasher_t;
+
+/**
+ * Private data of af_alg_hasher_t
+ */
+struct private_af_alg_hasher_t {
+
+	/**
+	 * Public part of this class.
+	 */
+	af_alg_hasher_t public;
+
+	/**
+	 * Transform fd
+	 */
+	int tfm;
+
+	/**
+	 * Current operation fd, -1 if none
+	 */
+	int op;
+
+	/**
+	 * Size of the hash
+	 */
+	size_t size;
+};
+
+/**
+ * Get the kernel algorithm string and hash size for our identifier
+ */
+static size_t lookup_alg(hash_algorithm_t algo, char *name)
+{
+	static struct {
+		hash_algorithm_t id;
+		char *name;
+		size_t size;
+	} algs[] = {
+		{HASH_MD4 ,			"md4",			HASH_SIZE_MD4 		},
+		{HASH_MD5 ,			"md5",			HASH_SIZE_MD5 		},
+		{HASH_SHA1,			"sha1",			HASH_SIZE_SHA1		},
+		{HASH_SHA224,		"sha224",		HASH_SIZE_SHA224	},
+		{HASH_SHA256,		"sha256",		HASH_SIZE_SHA256	},
+		{HASH_SHA384,		"sha384",		HASH_SIZE_SHA384	},
+		{HASH_SHA512,		"sha512",		HASH_SIZE_SHA512	},
+	};
+	int i;
+
+	for (i = 0; i < countof(algs); i++)
+	{
+		if (algs[i].id == algo)
+		{
+			strcpy(name, algs[i].name);
+			return algs[i].size;
+		}
+	}
+	return 0;
+}
+
+METHOD(hasher_t, get_hash_size, size_t,
+	private_af_alg_hasher_t *this)
+{
+	return this->size;
+}
+
+METHOD(hasher_t, reset, void,
+	private_af_alg_hasher_t *this)
+{
+	if (this->op != -1)
+	{
+		close(this->op);
+		this->op = -1;
+	}
+}
+
+METHOD(hasher_t, get_hash, void,
+	private_af_alg_hasher_t *this, chunk_t chunk, u_int8_t *hash)
+{
+	ssize_t len;
+
+	while (this->op == -1)
+	{
+		this->op = accept(this->tfm, NULL, 0);
+		if (this->op == -1)
+		{
+			DBG1(DBG_LIB, "opening AF_ALG hasher failed: %s", strerror(errno));
+			sleep(1);
+		}
+	}
+	do
+	{
+		len = send(this->op, chunk.ptr, chunk.len, hash ? 0 : MSG_MORE);
+		if (len == -1)
+		{
+			DBG1(DBG_LIB, "writing to AF_ALG hasher failed: %s", strerror(errno));
+			sleep(1);
+		}
+		else
+		{
+			chunk = chunk_skip(chunk, len);
+		}
+	}
+	while (chunk.len);
+	if (hash)
+	{
+		while (read(this->op, hash, this->size) != this->size)
+		{
+			DBG1(DBG_LIB, "reading AF_ALG hasher failed: %s", strerror(errno));
+			sleep(1);
+		}
+		reset(this);
+	}
+}
+
+METHOD(hasher_t, allocate_hash, void,
+	private_af_alg_hasher_t *this, chunk_t chunk, chunk_t *hash)
+{
+	if (hash)
+	{
+		*hash = chunk_alloc(get_hash_size(this));
+		get_hash(this, chunk, hash->ptr);
+	}
+	else
+	{
+		get_hash(this, chunk, NULL);
+	}
+}
+
+METHOD(hasher_t, destroy, void,
+	private_af_alg_hasher_t *this)
+{
+	if (this->op != -1)
+	{
+		close(this->op);
+	}
+	close(this->tfm);
+	free(this);
+}
+
+/*
+ * Described in header
+ */
+af_alg_hasher_t *af_alg_hasher_create(hash_algorithm_t algo)
+{
+	private_af_alg_hasher_t *this;
+	struct sockaddr_alg sa = {
+		.salg_family = AF_ALG,
+		.salg_type = "hash",
+	};
+	size_t size;
+
+	size = lookup_alg(algo, sa.salg_name);
+	if (!size)
+	{	/* not supported by kernel */
+		return NULL;
+	}
+
+	INIT(this,
+		.public = {
+			.hasher = {
+				.get_hash = _get_hash,
+				.allocate_hash = _allocate_hash,
+				.get_hash_size = _get_hash_size,
+				.reset = _reset,
+				.destroy = _destroy,
+			},
+		},
+		.tfm = socket(AF_ALG, SOCK_SEQPACKET, 0),
+		.op = -1,
+		.size = size,
+	);
+
+	if (this->tfm == -1)
+	{
+		DBG1(DBG_LIB, "opening AF_ALG socket failed: %s", strerror(errno));
+		free(this);
+		return NULL;
+	}
+	if (bind(this->tfm, (struct sockaddr*)&sa, sizeof(sa)) == -1)
+	{
+		DBG1(DBG_LIB, "binding AF_ALG socket for '%s' failed: %s",
+			 sa.salg_name, strerror(errno));
+		destroy(this);
+		return NULL;
+	}
+	return &this->public;
+}

src/libstrongswan/plugins/af_alg/af_alg_hasher.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup af_alg_hasher af_alg_hasher
+ * @{ @ingroup af_alg
+ */
+
+#ifndef af_alg_HASHER_H_
+#define af_alg_HASHER_H_
+
+typedef struct af_alg_hasher_t af_alg_hasher_t;
+
+#include <crypto/hashers/hasher.h>
+
+/**
+ * Implementation of hashers using AF_ALG.
+ */
+struct af_alg_hasher_t {
+
+	/**
+	 * Implements hasher_t interface.
+	 */
+	hasher_t hasher;
+};
+
+/**
+ * Constructor to create af_alg_hasher_t.
+ *
+ * @param algo			algorithm
+ * @return				af_alg_hasher_t, NULL if not supported
+ */
+af_alg_hasher_t *af_alg_hasher_create(hash_algorithm_t algo);
+
+#endif /** af_alg_HASHER_H_ @}*/

src/libstrongswan/plugins/af_alg/af_alg_plugin.c

@@ -17,6 +17,8 @@
 
 #include <library.h>
 
+#include "af_alg_hasher.h"
+
 typedef struct private_af_alg_plugin_t private_af_alg_plugin_t;
 
 /**
@@ -33,6 +35,9 @@ struct private_af_alg_plugin_t {
 METHOD(plugin_t, destroy, void,
 	private_af_alg_plugin_t *this)
 {
+	lib->crypto->remove_hasher(lib->crypto,
+					(hasher_constructor_t)af_alg_hasher_create);
+
 	free(this);
 }
 
@@ -51,5 +56,20 @@ plugin_t *af_alg_plugin_create()
 		},
 	);
 
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA1,
+					(hasher_constructor_t)af_alg_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA224,
+					(hasher_constructor_t)af_alg_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA256,
+					(hasher_constructor_t)af_alg_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA384,
+					(hasher_constructor_t)af_alg_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA512,
+					(hasher_constructor_t)af_alg_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_MD5,
+					(hasher_constructor_t)af_alg_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_MD4,
+					(hasher_constructor_t)af_alg_hasher_create);
+
 	return &this->public.plugin;
 }