Add static domain security state generator tool.

net/tools/domain_security_preload_generator/spki_hash.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/tools/domain_security_preload_generator/spki_hash.h"
+
+#include <string>
+
+#include "base/base64.h"
+#include "base/logging.h"
+#include "base/strings/string_util.h"
+#include "third_party/boringssl/src/include/openssl/evp.h"
+
+namespace net {
+
+SPKIHash::SPKIHash() {}
+
+SPKIHash::~SPKIHash() {}
+
+bool SPKIHash::FromString(const std::string& hash_string) {
+  base::StringPiece base64_string;
+
+  if (!base::StartsWith(hash_string, "sha256/",
+                        base::CompareCase::INSENSITIVE_ASCII)) {
+    return false;
+  }
+  base64_string = hash_string.substr(7);
+
+  std::string decoded;
+  if (!base::Base64Decode(base64_string, &decoded)) {
+    return false;
+  }
+
+  if (decoded.size() != size()) {
+    return false;
+  }
+
+  memcpy(data_, decoded.data(), decoded.size());
+  return true;
+}
+
+bool SPKIHash::CalculateFromBytes(const uint8_t* input, size_t input_length) {
+  bssl::ScopedEVP_MD_CTX context;
+  if (!EVP_DigestInit(context.get(), EVP_sha256())) {
+    return false;
+  }
+
+  if (!EVP_DigestUpdate(context.get(), input, input_length)) {
+    return false;
+  }
+
+  uint32_t digest_len;
+  if (!EVP_DigestFinal(context.get(), data_, &digest_len)) {
+    return false;
+  }
+
+  DCHECK(digest_len == size());
+  return true;
+}
+
+}  // namespace net