Copied OEMCrypto utils to Android.

The OEMCrypto utils have been copied over from the CDM repo.
Tests have been excluded for this CL.

Files represent a snapshot taken from http://go/wvgerrit/148270
and http://go/wvgerrit/148372.

Bug: 205902021
Change-Id: I1a58952cd1436a48974367c5436bf7296163e6f1

libwvdrmengine/oemcrypto/util/include/wvcrc32.h

@@ -0,0 +1,22 @@
+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine
+// License Agreement.
+//
+// Compute CRC32/MPEG2 Checksum. Needed for verification of WV Keybox.
+//
+#ifndef WVOEC_UTIL_WVCRC32_H_
+#define WVOEC_UTIL_WVCRC32_H_
+
+#include <stdint.h>
+
+namespace wvoec {
+namespace util {
+uint32_t wvcrc32(const uint8_t* p_begin, size_t i_count);
+uint32_t wvcrc32Init();
+uint32_t wvcrc32Cont(const uint8_t* p_begin, size_t i_count, uint32_t prev_crc);
+
+// Convert to network byte order
+uint32_t wvcrc32n(const uint8_t* p_begin, size_t i_count);
+}  // namespace util
+}  // namespace wvoec
+#endif  // WVOEC_UTIL_WVCRC32_H_