Export media_cas_packager_sdk

common/ecb_util.h

@@ -0,0 +1,59 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2016 Google LLC.
+//
+// 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.
+////////////////////////////////////////////////////////////////////////////////
+
+// Contains ecb crypto routines for widevine protocols. These routines are used
+// as part of licensing and provisioning request handling.
+
+#ifndef COMMON_ECB_UTIL_H_
+#define COMMON_ECB_UTIL_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace widevine {
+namespace crypto_util {
+
+// Encrypts |src| into |dst| using 3DES ECB2 mode with the given key. This is
+// used for protecting content keys on some older Widevine keyboxes, and is not
+// intended for any other purpose. Returns false and sets *|dst|="" if
+// unsuccessful. Key should be 16 bytes. The first 8 are key2 of the 3DES key
+// bundle, and the last 8 bytes are key1 and key3. |src| must be a multiple of
+// 8 bytes.
+bool Encrypt3DesEcb(absl::string_view key, absl::string_view src, std::string* dst);
+
+// Decrypts |src| into |dst| using 3DES ECB2 mode with the given (16-byte)
+// key. This is used for protecting content keys on some older Widevine
+// keyboxes, and is not intended for any other purpose.
+// Returns false and sets *|dst|="" if unsuccessful. Note that it can only
+// fail if invalid key or data sizes are passed in.
+// Key should be 16 bytes. The first 8 are key2 of the 3DES key bundle,
+// and the last 8 bytes are key1 and key3. |src| must be a multiple of
+// 8 bytes.
+bool Decrypt3DesEcb(absl::string_view key, absl::string_view src, std::string* dst);
+
+// Encrypts |src| into |dst| using AES ECB mode with the given
+// key. This is used for protecting content keys on Widevine devices,
+// and is not intended for any other purpose.
+// Returns false and sets *|dst|="" if unsuccessful. Note that it can only
+// fail if invalid key or data sizes are passed in.
+// Key must be 16 bytes, and src must be a multiple of 16 bytes.
+bool EncryptAesEcb(absl::string_view key, absl::string_view src, std::string* dst);
+
+// Decrypts |src| into |dst| using AES ECB mode with the given
+// key. This is used for protecting content keys on Widevine devices,
+// and is not intended for any other purpose.
+// Returns false and sets *|dst|="" if unsuccessful. Note that it can only
+// fail if invalid key or data sizes are passed in.
+// Key must be 16 bytes, and src must be a multiple of 16 bytes.
+bool DecryptAesEcb(absl::string_view key, absl::string_view src, std::string* dst);
+
+}  // namespace crypto_util
+}  // namespace widevine
+
+#endif  // COMMON_ECB_UTIL_H_