1 files changed, 101 insertions, 0 deletions
diff --git a/install/include/install/verifier.h b/install/include/install/verifier.h
new file mode 100644
index 000000000..f9e947580
--- /dev/null
+++ b/install/include/install/verifier.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#include <functional>
+#include <memory>
+#include <vector>
+
+#include <openssl/ec_key.h>
+#include <openssl/rsa.h>
+#include <openssl/sha.h>
+
+constexpr size_t MiB = 1024 * 1024;
+
+using HasherUpdateCallback = std::function<void(const uint8_t* addr, uint64_t size)>;
+
+struct RSADeleter {
+  void operator()(RSA* rsa) const {
+    RSA_free(rsa);
+  }
+};
+
+struct ECKEYDeleter {
+  void operator()(EC_KEY* ec_key) const {
+    EC_KEY_free(ec_key);
+  }
+};
+
+struct Certificate {
+  typedef enum {
+    KEY_TYPE_RSA,
+    KEY_TYPE_EC,
+  } KeyType;
+
+  Certificate(int hash_len_, KeyType key_type_, std::unique_ptr<RSA, RSADeleter>&& rsa_,
+              std::unique_ptr<EC_KEY, ECKEYDeleter>&& ec_)
+      : hash_len(hash_len_), key_type(key_type_), rsa(std::move(rsa_)), ec(std::move(ec_)) {}
+
+  // SHA_DIGEST_LENGTH (SHA-1) or SHA256_DIGEST_LENGTH (SHA-256)
+  int hash_len;
+  KeyType key_type;
+  std::unique_ptr<RSA, RSADeleter> rsa;
+  std::unique_ptr<EC_KEY, ECKEYDeleter> ec;
+};
+
+class VerifierInterface {
+ public:
+  virtual ~VerifierInterface() = default;
+
+  // Returns the package size in bytes.
+  virtual uint64_t GetPackageSize() const = 0;
+
+  // Reads |byte_count| data starting from |offset|, and puts the result in |buffer|.
+  virtual bool ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) = 0;
+
+  // Updates the hash contexts for |length| bytes data starting from |start|.
+  virtual bool UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, uint64_t start,
+                                  uint64_t length) = 0;
+
+  // Updates the progress in fraction during package verification.
+  virtual void SetProgress(float progress) = 0;
+};
+
+//  Looks for an RSA signature embedded in the .ZIP file comment given the path to the zip.
+//  Verifies that it matches one of the given public keys. Returns VERIFY_SUCCESS or
+//  VERIFY_FAILURE (if any error is encountered or no key matches the signature).
+int verify_file(VerifierInterface* package, const std::vector<Certificate>& keys);
+
+// Checks that the RSA key has a modulus of 2048 or 4096 bits long, and public exponent is 3 or
+// 65537.
+bool CheckRSAKey(const std::unique_ptr<RSA, RSADeleter>& rsa);
+
+// Checks that the field size of the curve for the EC key is 256 bits.
+bool CheckECKey(const std::unique_ptr<EC_KEY, ECKEYDeleter>& ec_key);
+
+// Parses a PEM-encoded x509 certificate from the given buffer and saves it into |cert|. Returns
+// false if there is a parsing failure or the signature's encryption algorithm is not supported.
+bool LoadCertificateFromBuffer(const std::vector<uint8_t>& pem_content, Certificate* cert);
+
+// Iterates over the zip entries with the suffix "x509.pem" and returns a list of recognized
+// certificates. Returns an empty list if we fail to parse any of the entries.
+std::vector<Certificate> LoadKeysFromZipfile(const std::string& zip_name);
+
+#define VERIFY_SUCCESS 0
+#define VERIFY_FAILURE 1