[DO NOT MERGE] Revert "Restructed reference root of trust (2/3 DRM Cert)"

This reverts commit f6f5099604.

Reason for revert: Feature missed deadline

Bug: 135283522
Change-Id: Ic86930ee3444c5a6aa1d78ae3a12a9030c29ef92

libwvdrmengine/oemcrypto/ref/src/oemcrypto_rsa_key_shared.cpp

@@ -0,0 +1,101 @@
+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine Master
+// License Agreement.
+//
+//  Reference implementation of OEMCrypto APIs
+//
+#include "oemcrypto_rsa_key_shared.h"
+
+#include <assert.h>
+
+#include <openssl/bio.h>
+#include <openssl/err.h>
+#include <openssl/rsa.h>
+#include <openssl/sha.h>
+#include <openssl/x509.h>
+
+#include "log.h"
+
+namespace wvoec_ref {
+
+void dump_boringssl_error() {
+  int count = 0;
+  while (unsigned long err = ERR_get_error()) {
+    count++;
+    char buffer[120];
+    ERR_error_string_n(err, buffer, sizeof(buffer));
+    LOGE("BoringSSL Error %d -- %lu -- %s", count, err, buffer);
+  }
+  LOGE("Reported %d BoringSSL Errors", count);
+}
+
+void RSA_shared_ptr::reset() {
+  if (rsa_key_ && key_owned_) {
+    RSA_free(rsa_key_);
+  }
+  key_owned_ = false;
+  rsa_key_ = nullptr;
+}
+
+bool RSA_shared_ptr::LoadPkcs8RsaKey(const uint8_t* buffer, size_t length) {
+  assert(buffer != nullptr);
+  reset();
+  uint8_t* pkcs8_rsa_key = const_cast<uint8_t*>(buffer);
+  BIO* bio = BIO_new_mem_buf(pkcs8_rsa_key, length);
+  if (bio == nullptr) {
+    LOGE("[LoadPkcs8RsaKey(): Could not allocate bio buffer]");
+    return false;
+  }
+  bool success = true;
+  PKCS8_PRIV_KEY_INFO* pkcs8_pki = d2i_PKCS8_PRIV_KEY_INFO_bio(bio, nullptr);
+  if (pkcs8_pki == nullptr) {
+    BIO_reset(bio);
+    pkcs8_pki = d2i_PKCS8_PRIV_KEY_INFO_bio(bio, nullptr);
+    if (pkcs8_pki == nullptr) {
+      LOGE("[LoadPkcs8RsaKey(): d2i_PKCS8_PRIV_KEY_INFO_bio returned nullptr]");
+      dump_boringssl_error();
+      success = false;
+    }
+  }
+  EVP_PKEY* evp = nullptr;
+  if (success) {
+    evp = EVP_PKCS82PKEY(pkcs8_pki);
+    if (evp == nullptr) {
+      LOGE("[LoadPkcs8RsaKey(): EVP_PKCS82PKEY returned nullptr]");
+      dump_boringssl_error();
+      success = false;
+    }
+  }
+  if (success) {
+    rsa_key_ = EVP_PKEY_get1_RSA(evp);
+    if (rsa_key_ == nullptr) {
+      LOGE("[LoadPkcs8RsaKey(): PrivateKeyInfo did not contain an RSA key]");
+      success = false;
+    }
+    key_owned_ = true;
+  }
+  if (evp != nullptr) {
+    EVP_PKEY_free(evp);
+  }
+  if (pkcs8_pki != nullptr) {
+    PKCS8_PRIV_KEY_INFO_free(pkcs8_pki);
+  }
+  BIO_free(bio);
+  if (!success) {
+    return false;
+  }
+  switch (RSA_check_key(rsa_key_)) {
+    case 1:  // valid.
+      return true;
+    case 0:  // not valid.
+      LOGE("[LoadPkcs8RsaKey(): rsa key not valid]");
+      dump_boringssl_error();
+      return false;
+    default:  // -1 == check failed.
+      LOGE("[LoadPkcs8RsaKey(): error checking rsa key]");
+      dump_boringssl_error();
+      return false;
+  }
+}
+
+}  // namespace wvoec_ref