gcrypt hasher implementation

src/libstrongswan/plugins/gcrypt/Makefile.am

@@ -5,7 +5,8 @@ AM_CFLAGS = -rdynamic
 
 plugin_LTLIBRARIES = libstrongswan-gcrypt.la
 
-libstrongswan_gcrypt_la_SOURCES = gcrypt_plugin.h gcrypt_plugin.c
+libstrongswan_gcrypt_la_SOURCES = gcrypt_plugin.h gcrypt_plugin.c \
+	gcrypt_hasher.h gcrypt_hasher.c
 
 libstrongswan_gcrypt_la_LDFLAGS = -module
 libstrongswan_gcrypt_la_LIBADD  = -lgcrypt

src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c

@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil 
+ *
+ * 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 "gcrypt_hasher.h"
+
+#include <debug.h>
+
+#include <gcrypt.h>
+
+typedef struct private_gcrypt_hasher_t private_gcrypt_hasher_t;
+
+/**
+ * Private data of gcrypt_hasher_t
+ */
+struct private_gcrypt_hasher_t {
+	
+	/**
+	 * Public part of this class.
+	 */
+	gcrypt_hasher_t public;
+	
+	/**
+	 * gcrypt hasher context
+	 */
+	gcry_md_hd_t hd;
+};
+
+/**
+ * Implementation of hasher_t.get_hash_size.
+ */
+static size_t get_hash_size(private_gcrypt_hasher_t *this)
+{
+	return gcry_md_get_algo_dlen(gcry_md_get_algo(this->hd));
+}
+
+/**
+ * Implementation of hasher_t.reset.
+ */
+static void reset(private_gcrypt_hasher_t *this)
+{
+	gcry_md_reset(this->hd);
+}
+
+/**
+ * Implementation of hasher_t.get_hash.
+ */
+static void get_hash(private_gcrypt_hasher_t *this, chunk_t chunk,
+					 u_int8_t *hash)
+{
+	gcry_md_write(this->hd, chunk.ptr, chunk.len);
+	if (hash)
+	{
+		memcpy(hash, gcry_md_read(this->hd, 0), get_hash_size(this));
+		gcry_md_reset(this->hd);
+	}
+}
+
+/**
+ * Implementation of hasher_t.allocate_hash.
+ */
+static void allocate_hash(private_gcrypt_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);
+	}
+}
+
+/**
+ * Implementation of hasher_t.destroy.
+ */
+static void destroy (private_gcrypt_hasher_t *this)
+{
+	gcry_md_close(this->hd);
+	free(this);
+}
+
+/*
+ * Described in header
+ */
+gcrypt_hasher_t *gcrypt_hasher_create(hash_algorithm_t algo)
+{
+	private_gcrypt_hasher_t *this;
+	int gcrypt_alg;
+	gcry_error_t err;
+	
+	switch (algo)
+	{
+		case HASH_MD2:
+			gcrypt_alg = GCRY_MD_MD2;
+			break;
+		case HASH_MD4:
+			gcrypt_alg = GCRY_MD_MD4;
+			break;
+		case HASH_MD5:
+			gcrypt_alg = GCRY_MD_MD5;
+			break;
+		case HASH_SHA1:
+			gcrypt_alg = GCRY_MD_SHA1;
+			break;
+		case HASH_SHA256:
+			gcrypt_alg = GCRY_MD_SHA256;
+			break;
+		case HASH_SHA384:
+			gcrypt_alg = GCRY_MD_SHA384;
+			break;
+		case HASH_SHA512:
+			gcrypt_alg = GCRY_MD_SHA512;
+			break;
+		default:
+			return NULL;
+	}
+	
+	this = malloc_thing(private_gcrypt_hasher_t);
+	
+	err = gcry_md_open(&this->hd, gcrypt_alg, 0);
+	if (err)
+	{
+		DBG1("grcy_md_open(%N) failed: %s",
+			 hash_algorithm_names, algo, gpg_strerror(err));
+		free(this);
+		return NULL;
+	}
+	
+	this->public.hasher_interface.get_hash = (void (*) (hasher_t*, chunk_t, u_int8_t*))get_hash;
+	this->public.hasher_interface.allocate_hash = (void (*) (hasher_t*, chunk_t, chunk_t*))allocate_hash;
+	this->public.hasher_interface.get_hash_size = (size_t (*) (hasher_t*))get_hash_size;
+	this->public.hasher_interface.reset = (void (*) (hasher_t*))reset;
+	this->public.hasher_interface.destroy = (void (*) (hasher_t*))destroy;
+	
+	return &this->public;
+}
+

src/libstrongswan/plugins/gcrypt/gcrypt_hasher.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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 gcrypt_hasher gcrypt_hasher
+ * @{ @ingroup gcrypt_p
+ */
+
+#ifndef GCRYPT_HASHER_H_
+#define GCRYPT_HASHER_H_
+
+typedef struct gcrypt_hasher_t gcrypt_hasher_t;
+
+#include <crypto/hashers/hasher.h>
+
+/**
+ * Implementation of hashers using libgcrypt.
+ */
+struct gcrypt_hasher_t {
+	
+	/**
+	 * The hasher_t interface.
+	 */
+	hasher_t hasher_interface;
+};
+
+/**
+ * Constructor to create gcrypt_hasher_t.
+ * 
+ * @param algo			algorithm
+ * @return				gcrypt_hasher_t, NULL if not supported
+ */
+gcrypt_hasher_t *gcrypt_hasher_create(hash_algorithm_t algo);
+
+#endif /** GCRYPT_HASHER_H_ @}*/

src/libstrongswan/plugins/gcrypt/gcrypt_plugin.c

@@ -15,6 +15,8 @@
 
 #include "gcrypt_plugin.h"
 
+#include "gcrypt_hasher.h"
+
 #include <library.h>
 #include <debug.h>
 
@@ -45,6 +47,8 @@ GCRY_THREAD_OPTION_PTHREAD_IMPL;
  */
 static void destroy(private_gcrypt_plugin_t *this)
 {
+	lib->crypto->remove_hasher(lib->crypto,
+					(hasher_constructor_t)gcrypt_hasher_create);
 	free(this);
 }
 
@@ -71,6 +75,22 @@ plugin_t *plugin_create()
 	
 	this->public.plugin.destroy = (void(*)(plugin_t*))destroy;
 	
+	/* hashers */
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA1,
+					(hasher_constructor_t)gcrypt_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_MD2,
+					(hasher_constructor_t)gcrypt_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_MD4,
+					(hasher_constructor_t)gcrypt_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_MD5,
+					(hasher_constructor_t)gcrypt_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA256,
+					(hasher_constructor_t)gcrypt_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA384,
+					(hasher_constructor_t)gcrypt_hasher_create);
+	lib->crypto->add_hasher(lib->crypto, HASH_SHA512,
+					(hasher_constructor_t)gcrypt_hasher_create);
+	
 	return &this->public.plugin;
 }