diff --git a/libdevcrypto/AES.h b/libdevcrypto/AES.h
index 32d1880dc..6aaed6fad 100644
--- a/libdevcrypto/AES.h
+++ b/libdevcrypto/AES.h
@@ -75,6 +75,8 @@ public:
 	
 	/// Adjust mac interval. Next mac will be xored with value.
 	void adjustInterval(unsigned _interval) { m_macInterval = _interval; }
+
+	unsigned getMacInterval() { return m_macInterval;}
 	
 private:
 	AuthenticatedStream(AuthenticatedStream const&) = delete;
diff --git a/test/libdevcrypto/AES.cpp b/test/libdevcrypto/AES.cpp
new file mode 100644
index 000000000..071f1509c
--- /dev/null
+++ b/test/libdevcrypto/AES.cpp
@@ -0,0 +1,92 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum 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 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum 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.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file AES.cpp
+ * @author Christoph Jentzsch <cj@ethdev.com>
+ * @date 2015
+ */
+
+#include <boost/test/unit_test.hpp>
+#include <libdevcore/Common.h>
+#include <libdevcrypto/Common.h>
+#include <libdevcore/SHA3.h>
+#include <libdevcrypto/AES.h>
+#include <libdevcore/FixedHash.h>
+
+using namespace std;
+using namespace dev;
+
+BOOST_AUTO_TEST_SUITE(AES)
+
+BOOST_AUTO_TEST_CASE(AesDecrypt)
+{
+	cout << "AesDecrypt" << endl;
+	bytes seed = fromHex("2dbaead416c20cfd00c2fc9f1788ff9f965a2000799c96a624767cb0e1e90d2d7191efdd92349226742fdc73d1d87e2d597536c4641098b9a89836c94f58a2ab4c525c27c4cb848b3e22ea245b2bc5c8c7beaa900b0c479253fc96fce7ffc621");
+	KeyPair kp(sha3(aesDecrypt(&seed, "test")));
+	BOOST_CHECK(Address("07746f871de684297923f933279555dda418f8a2") == kp.address());
+}
+
+BOOST_AUTO_TEST_CASE(AesDecryptWrongSeed)
+{
+	cout << "AesDecryptWrongSeed" << endl;
+	bytes seed = fromHex("badaead416c20cfd00c2fc9f1788ff9f965a2000799c96a624767cb0e1e90d2d7191efdd92349226742fdc73d1d87e2d597536c4641098b9a89836c94f58a2ab4c525c27c4cb848b3e22ea245b2bc5c8c7beaa900b0c479253fc96fce7ffc621");
+	KeyPair kp(sha3(aesDecrypt(&seed, "test")));
+	BOOST_CHECK(Address("07746f871de684297923f933279555dda418f8a2") != kp.address());
+}
+
+BOOST_AUTO_TEST_CASE(AesDecryptWrongPassword)
+{
+	cout << "AesDecryptWrongPassword" << endl;
+	bytes seed = fromHex("2dbaead416c20cfd00c2fc9f1788ff9f965a2000799c96a624767cb0e1e90d2d7191efdd92349226742fdc73d1d87e2d597536c4641098b9a89836c94f58a2ab4c525c27c4cb848b3e22ea245b2bc5c8c7beaa900b0c479253fc96fce7ffc621");
+	KeyPair kp(sha3(aesDecrypt(&seed, "badtest")));
+	BOOST_CHECK(Address("07746f871de684297923f933279555dda418f8a2") != kp.address());
+}
+
+BOOST_AUTO_TEST_CASE(AesDecryptFailInvalidSeed)
+{
+	cout << "AesDecryptFailInvalidSeed" << endl;
+	bytes seed = fromHex("xdbaead416c20cfd00c2fc9f1788ff9f965a2000799c96a624767cb0e1e90d2d7191efdd92349226742fdc73d1d87e2d597536c4641098b9a89836c94f58a2ab4c525c27c4cb848b3e22ea245b2bc5c8c7beaa900b0c479253fc96fce7ffc621");
+	BOOST_CHECK(bytes() == aesDecrypt(&seed, "test"));
+}
+
+BOOST_AUTO_TEST_CASE(AesDecryptFailInvalidSeedSize)
+{
+	cout << "AesDecryptFailInvalidSeedSize" << endl;
+	bytes seed = fromHex("000102030405060708090a0b0c0d0e0f");
+	BOOST_CHECK(bytes() == aesDecrypt(&seed, "test"));
+}
+
+BOOST_AUTO_TEST_CASE(AesDecryptFailInvalidSeed2)
+{
+	cout << "AesDecryptFailInvalidSeed2" << endl;
+	bytes seed = fromHex("000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f");
+	BOOST_CHECK(bytes() == aesDecrypt(&seed, "test"));
+}
+BOOST_AUTO_TEST_CASE(AuthenticatedStreamConstructor)
+{
+	cout << "AuthenticatedStreamConstructor" << endl;
+
+	Secret const sec("test");
+	crypto::aes::AuthenticatedStream as(crypto::aes::Encrypt, sec, 0);
+	BOOST_CHECK(as.getMacInterval() == 0);
+	as.adjustInterval(1);
+	BOOST_CHECK(as.getMacInterval() == 1);
+	crypto::aes::AuthenticatedStream as_mac(crypto::aes::Encrypt, h128(), h128(), 42);
+	BOOST_CHECK(as_mac.getMacInterval() == 42);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+