1 files changed, 110 insertions, 0 deletions
diff --git a/SoftHSMv2/src/lib/data_mgr/RFC4880.cpp b/SoftHSMv2/src/lib/data_mgr/RFC4880.cpp
new file mode 100644
index 0000000..9ea23bd
--- /dev/null
+++ b/SoftHSMv2/src/lib/data_mgr/RFC4880.cpp
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2010 SURFnet bv
+ * 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 AUTHOR ``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 AUTHOR 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.
+ */
+
+/*****************************************************************************
+ RFC4880.cpp
+
+ Implements a secure password-based key derivation scheme. It is not a generic
+ implementation of the RFC but only generates 256-bit AES keys according to
+ the "iterated and salted" scheme.
+ *****************************************************************************/
+
+#include "config.h"
+#include "RFC4880.h"
+#include "CryptoFactory.h"
+#include "HashAlgorithm.h"
+
+// This function derives a 256-bit AES key from the supplied password data
+bool RFC4880::PBEDeriveKey(const ByteString& password, ByteString& salt, AESKey** ppKey)
+{
+	// Check that a proper salt value was supplied; it should be at least 8 bytes long
+	if (salt.size() < 8)
+	{
+		ERROR_MSG("Insufficient salt data supplied for password-based encryption");
+
+		return false;
+	}
+
+	// Check other parameters
+	if ((password.size() == 0) || (ppKey == NULL))
+	{
+		return false;
+	}
+
+	// Determine the iteration count based on the last byte of the salt
+	unsigned int iter = PBE_ITERATION_BASE_COUNT + salt[salt.size() - 1];
+
+	// Get a hash instance
+	HashAlgorithm* hash = CryptoFactory::i()->getHashAlgorithm(HashAlgo::SHA256);
+
+	if (hash == NULL)
+	{
+		ERROR_MSG("Could not get a SHA-256 instance");
+
+		return false;
+	}
+
+	// Perform the first iteration which takes as input the salt value and
+	// the password
+	ByteString intermediate;
+
+	if (!hash->hashInit() ||
+	    !hash->hashUpdate(salt) ||
+	    !hash->hashUpdate(password) ||
+	    !hash->hashFinal(intermediate))
+	{
+		ERROR_MSG("Hashing failed");
+
+		CryptoFactory::i()->recycleHashAlgorithm(hash);
+
+		return false;
+	}
+
+	// Perform the remaining iteration
+	while (--iter > 0)
+	{
+		if (!hash->hashInit() ||
+		    !hash->hashUpdate(intermediate) ||
+		    !hash->hashFinal(intermediate))
+		{
+			ERROR_MSG("Hashing failed");
+
+			CryptoFactory::i()->recycleHashAlgorithm(hash);
+
+			return false;
+		}
+	}
+
+	// Create the AES key instance
+	*ppKey = new AESKey(256);
+	(*ppKey)->setKeyBits(intermediate);
+
+	// Release the hash instance
+	CryptoFactory::i()->recycleHashAlgorithm(hash);
+
+	return true;
+}
+