Export provisioning sdk

Change-Id: I4d47d80444c9507f84896767dc676112ca11e901

common/aes_cbc_util.h

@@ -0,0 +1,38 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2016 Google Inc.
+//
+// This software is licensed under the terms defined in the Widevine Master
+// License Agreement. For a copy of this agreement, please contact
+// widevine-licensing@google.com.
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef COMMON_AES_CBC_UTIL_H_
+#define COMMON_AES_CBC_UTIL_H_
+
+#include <string>
+
+namespace widevine {
+namespace crypto_util {
+
+// Helper for wrapping AES CBC encryption. Uses PKCS5 padding.
+std::string EncryptAesCbc(const std::string& key, const std::string& iv,
+                     const std::string& plaintext);
+
+// Helper for common Keybox decrypt operations; wraps AES-CBC.  Returns an
+// empty std::string on error or the plaintext on success. Uses PKCS5 padding.
+std::string DecryptAesCbc(const std::string& key, const std::string& iv,
+                     const std::string& ciphertext);
+
+// Helper for common Keybox decrypt operations; wraps AES-CBC.  Returns an
+// empty std::string on error or the plaintext on success.
+// Uses no padding; fails if the ciphertext is not a multiple of 16 bytes.
+// This is used to decrypt the encrypted blob in the WVM keyboxes, with
+// a zero iv.
+std::string DecryptAesCbcNoPad(const std::string& key, const std::string& iv,
+                          const std::string& ciphertext);
+
+}  // namespace crypto_util
+}  // namespace widevine
+
+#endif  // COMMON_AES_CBC_UTIL_H_
+