Added NetworkingPrivateCrypto and its unit test.

chrome/browser/extensions/api/networking_private/networking_private_crypto.cc

+// Copyright 2013 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 "chrome/browser/extensions/api/networking_private/networking_private_crypto.h"
+
+#include <cert.h>
+#include <cryptohi.h>
+#include <keyhi.h>
+#include <keythi.h>
+#include <pk11pub.h>
+#include <sechash.h>
+#include <secport.h>
+
+#include "base/base64.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "crypto/nss_util.h"
+#include "crypto/rsa_private_key.h"
+#include "crypto/scoped_nss_types.h"
+#include "net/cert/pem_tokenizer.h"
+#include "net/cert/x509_certificate.h"
+
+const char kTrustedCAPublicKeyDER[] =
+    "MIIBCgKCAQEAvCKAvYD2OiEAO652XjV/PcNkXFWUhjQvBYcozfdpjBezUKe4gvrfx0Mt1n6roG"
+    "+3E3KApEcVwSCZUM3sFGIJW6SYzdJBtjZO/+guMjBKgahCo2ybM27KsvVTZuAnU4YahR6nOT9K"
+    "d477VGZm+1hUwF45x/VQBgvgitTO4WpVH4sXAOZpoyfmCCVpPBKdjQUs1i6iMd60UlDWIEneca"
+    "D5rSBAEvHdJevV5rg29NaPf8pD3NcQW+Y/UYqFs/P/9gMtyyNPnK0Y55MFjKxSmvdM6Zl6vm5+"
+    "TQrjxhypk/o6pZFdHL1m68xg3IZ0ys/4khyYfVf6YUeeq4C35EiAKpLFGwIDAQAB";
+
+namespace {
+bool GetDERFromPEM(const std::string& pem_data,
+                   const std::string& pem_type,
+                   std::string* der_output) {
+  std::vector<std::string> headers;
+  headers.push_back(pem_type);
+  net::PEMTokenizer pem_tok(pem_data, headers);
+  if (!pem_tok.GetNext()) {
+    return false;
+  }
+
+  *der_output = pem_tok.data();
+  return true;
+}
+
+}  // namespace
+
+namespace crypto {
+typedef scoped_ptr_malloc<
+    CERTCertificate,
+    ::crypto::NSSDestroyer<CERTCertificate,
+    CERT_DestroyCertificate> >
+    ScopedCERTCertificate;

[Ryan Sleevi, 2013/08/29 21:30:43]

Clang-format messing up again. May be worth filing a bug

typedef scoped_ptr_malloc<
    CERTCertificate,
    crypto::NSSDestroyer<CERTCertificate,
                         CERT_DestroyCertificate> >
    ScopedCERTCertificate;

[mef, 2013/08/30 17:07:39]

Done.

+}  // namespace crypto
+
+NetworkingPrivateCrypto::NetworkingPrivateCrypto() {}
+
+NetworkingPrivateCrypto::~NetworkingPrivateCrypto() {}
+
+bool NetworkingPrivateCrypto::VerifyCredentials(
+    const std::string& certificate,
+    const std::string& signed_data,
+    const std::string& unsigned_data,
+    const std::string& connected_mac) {
+  crypto::EnsureNSSInit();
+
+  std::string cert_data;
+  if (!GetDERFromPEM(certificate, "CERTIFICATE", &cert_data)) {
+    LOG(ERROR) << "Failed to parse certificate.";
+    return false;
+  }
+  SECItem der_cert = {
+      siDERCertBuffer,
+      reinterpret_cast<unsigned char*>(const_cast<char*>(cert_data.c_str())),
+      cert_data.length()};
+  // Parse into a certificate structure.
+  crypto::ScopedCERTCertificate cert(CERT_NewTempCertificate(
+      CERT_GetDefaultCertDB(), &der_cert, NULL, PR_FALSE, PR_TRUE));
+  if (!cert.get()) {
+    LOG(ERROR) << "Failed to parse certificate.";
+    return false;
+  }
+  // Check that the certificate is signed by trusted CA.
+  std::string ca_key_der;
+  base::Base64Decode(kTrustedCAPublicKeyDER, &ca_key_der);
+  SECItem trusted_ca_key_der_item = {
+      siDERCertBuffer,
+      reinterpret_cast<unsigned char*>(const_cast<char*>(ca_key_der.c_str())),
+      ca_key_der.size()};
+  crypto::ScopedSECKEYPublicKey ca_public_key(
+      SECKEY_ImportDERPublicKey(&trusted_ca_key_der_item, CKK_RSA));
+  SECStatus verified = CERT_VerifySignedDataWithPublicKey(
+      &cert->signatureWrap, ca_public_key.get(), NULL);
+  if (verified != SECSuccess) {
+    LOG(ERROR) << "Certificate is not issued by trusted CA.";
+    return false;
+  }
+
+  // Check that the device listed in the certificate is correct.
+  // Something like evt_e161 001a11ffacdf
+  char* common_name = CERT_GetCommonName(&cert->subject);
+  if (!common_name) {
+    LOG(ERROR) << "Certificate does not have common name.";
+    return false;
+  }
+
+  std::string subject_name(common_name);
+  PORT_Free(common_name);
+  std::string translated_mac;
+  RemoveChars(connected_mac, ":", &translated_mac);
+  if (!EndsWith(subject_name, translated_mac, false)) {
+    LOG(ERROR) << "MAC addresses don't match.";
+    return false;
+  }
+
+  // Make sure that the certificate matches the unsigned data presented.
+  // Verify that hash(unsigned_data) == public(signed_data)

[Ryan Sleevi, 2013/08/29 21:30:43]

This comment doesn't really make sense, especially since it's technically
'signed_data' and 'signature' that you're using here

// Verify that the signature matches signed_data

[mef, 2013/08/30 17:07:39]

Done.

+  crypto::ScopedSECKEYPublicKey public_key(CERT_ExtractPublicKey(cert.get()));
+  if (!public_key.get()) {
+    LOG(ERROR) << "Unable to extract public key from certificate.";
+    return false;
+  }
+  SECItem signature_item = {
+      siBuffer,
+      reinterpret_cast<unsigned char*>(const_cast<char*>(signed_data.c_str())),
+      static_cast<unsigned int>(signed_data.size())};
+  verified = VFY_VerifyDataDirect(reinterpret_cast<unsigned char*>(
+      const_cast<char*>(unsigned_data.c_str())), unsigned_data.size(),
+      public_key.get(), &signature_item, SEC_OID_PKCS1_RSA_ENCRYPTION,
+      SEC_OID_SHA1, NULL, NULL);
+  if (verified != SECSuccess) {
+    LOG(ERROR) << "Signed blobs did not match.";
+    return false;
+  }
+  return true;
+}
+
+bool NetworkingPrivateCrypto::EncryptByteString(const std::string& pub_key_der,
+                                                const std::string& data,
+                                                std::string* encrypted_output) {
+  crypto::EnsureNSSInit();
+
+  SECItem pub_key_der_item = {
+      siDERCertBuffer,
+      reinterpret_cast<unsigned char*>(const_cast<char*>(pub_key_der.c_str())),
+      pub_key_der.size()};
+  crypto::ScopedSECKEYPublicKey public_key(SECKEY_ImportDERPublicKey(
+      &pub_key_der_item, CKK_RSA));
+  if (!public_key.get()) {
+    LOG(ERROR) << "Failed to parse public key.";
+    return false;
+  }
+
+  size_t encrypted_length = SECKEY_SignatureLen(public_key.get());
+  scoped_ptr<unsigned char[]> rsa_output(new unsigned char[encrypted_length]);
+  SECStatus encrypted = PK11_PubEncryptPKCS1(
+      public_key.get(),
+      rsa_output.get(),
+      reinterpret_cast<unsigned char*>(const_cast<char*>(data.data())),
+      data.length(),
+      NULL);
+  if (encrypted != SECSuccess) {
+    LOG(ERROR) << "Error during encryption.";
+    return false;
+  }
+  encrypted_output->assign(reinterpret_cast<char*>(rsa_output.get()),
+                           encrypted_length);
+  return true;
+}
+
+bool NetworkingPrivateCrypto::DecryptByteString(
+    const std::string& private_key_pem,
+    const std::string& encrypted_data,
+    std::string* decrypted_output) {
+  crypto::EnsureNSSInit();
+
+  std::string private_key_der;
+  if (!GetDERFromPEM(private_key_pem, "PRIVATE KEY", &private_key_der)) {
+    LOG(ERROR) << "Failed to parse private key PEM.";
+    return false;
+  }
+  std::vector<uint8> private_key_data(private_key_der.begin(),
+                                      private_key_der.end());
+  scoped_ptr<crypto::RSAPrivateKey> private_key(
+      crypto::RSAPrivateKey::CreateFromPrivateKeyInfo(private_key_data));
+  if (!private_key || !private_key->public_key()) {
+    LOG(ERROR) << "Failed to parse private key DER.";
+    return false;
+  }
+
+  size_t encrypted_length = SECKEY_SignatureLen(private_key->public_key());
+  scoped_ptr<unsigned char[]> rsa_output(new unsigned char[encrypted_length]);
+  unsigned int output_length = 0;
+  SECStatus decrypted =
+      PK11_PrivDecryptPKCS1(private_key->key(),
+                            rsa_output.get(),
+                            &output_length,
+                            encrypted_length,
+                            reinterpret_cast<unsigned char*>(
+                                const_cast<char*>(encrypted_data.data())),
+                            encrypted_data.length());
+  if (decrypted != SECSuccess) {
+    LOG(ERROR) << "Error during encryption.";
+    return false;
+  }
+  decrypted_output->assign(reinterpret_cast<char*>(rsa_output.get()),
+                           output_length);
+  return true;
+}