Add keymaster to keystore with soft implementation

Add hardware crypto capabilities to keystore. This allows hardware
escrow of private key material.

There is also an OpenSSL engine that connects to keystore to allow use
of the keystore keys from native code built into the platform.

This includes a software implementation of keymaster using OpenSSL
as the backend.  This is just as insecure as the previous solution,
but it's needed so devices without hardware support can continue
to operate in the new scheme without a lot of compatibility code.

Change-Id: I2bc67766e1f633ef1cbbd2874a65962074e84f4f
diff --git a/softkeymaster/Android.mk b/softkeymaster/Android.mk
new file mode 100644
index 0000000..6becd78
--- /dev/null
+++ b/softkeymaster/Android.mk
@@ -0,0 +1,35 @@
+# Copyright (C) 2012 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := keystore.default
+
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+
+LOCAL_SRC_FILES := keymaster_openssl.cpp
+
+LOCAL_C_INCLUDES := \
+	libcore/include \
+	external/openssl/include
+
+LOCAL_C_FLAGS = -fvisibility=hidden -Wall -Werror
+
+LOCAL_SHARED_LIBRARIES := libcrypto liblog
+
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)