1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef NET_CERT_X509_UTIL_H_ 6#define NET_CERT_X509_UTIL_H_ 7 8#include <string> 9 10#include "base/memory/ref_counted.h" 11#include "base/memory/scoped_ptr.h" 12#include "base/time/time.h" 13#include "net/base/net_export.h" 14 15namespace crypto { 16class ECPrivateKey; 17class RSAPrivateKey; 18} 19 20namespace net { 21 22class X509Certificate; 23 24namespace x509_util { 25 26// Supported digest algorithms for signing certificates. 27enum DigestAlgorithm { 28 DIGEST_SHA1, 29 DIGEST_SHA256 30}; 31 32// Returns true if the times can be used to create an X.509 certificate. 33// Certificates can accept dates from Jan 1st, 1 to Dec 31, 9999. A bug in NSS 34// limited the range to 1950-9999 35// (https://bugzilla.mozilla.org/show_bug.cgi?id=786531). This function will 36// return whether it is supported by the currently used crypto library. 37NET_EXPORT_PRIVATE bool IsSupportedValidityRange(base::Time not_valid_before, 38 base::Time not_valid_after); 39 40// Creates a private keypair and server bound certificate. 41// Domain, serial number and validity period are given as 42// parameters. The certificate is signed by the private key in |key|. 43// The signature algorithm may be updated periodically to match best practices. 44// 45// See Internet Draft draft-balfanz-tls-obc-00 for more details: 46// http://tools.ietf.org/html/draft-balfanz-tls-obc-00 47NET_EXPORT_PRIVATE bool CreateKeyAndChannelIDEC( 48 const std::string& domain, 49 uint32 serial_number, 50 base::Time not_valid_before, 51 base::Time not_valid_after, 52 scoped_ptr<crypto::ECPrivateKey>* key, 53 std::string* der_cert); 54 55// Helper function for CreateKeyAndChannelIDEC. 56NET_EXPORT_PRIVATE bool CreateChannelIDEC(crypto::ECPrivateKey* key, 57 DigestAlgorithm alg, 58 const std::string& domain, 59 uint32 serial_number, 60 base::Time not_valid_before, 61 base::Time not_valid_after, 62 std::string* der_cert); 63 64// Creates a public-private keypair and a self-signed certificate. 65// Subject, serial number and validity period are given as parameters. 66// The certificate is signed by the private key in |key|. The key length and 67// signature algorithm may be updated periodically to match best practices. 68// 69// |subject| is a distinguished name defined in RFC4514 with _only_ a CN 70// component, as in: 71// CN=Michael Wong 72// 73// SECURITY WARNING 74// 75// Using self-signed certificates has the following security risks: 76// 1. Encryption without authentication and thus vulnerable to 77// man-in-the-middle attacks. 78// 2. Self-signed certificates cannot be revoked. 79// 80// Use this certificate only after the above risks are acknowledged. 81NET_EXPORT bool CreateKeyAndSelfSignedCert( 82 const std::string& subject, 83 uint32 serial_number, 84 base::Time not_valid_before, 85 base::Time not_valid_after, 86 scoped_ptr<crypto::RSAPrivateKey>* key, 87 std::string* der_cert); 88 89// Creates a self-signed certificate from a provided key, using the specified 90// hash algorithm. You should not re-use a key for signing data with multiple 91// signature algorithms or parameters. 92NET_EXPORT bool CreateSelfSignedCert(crypto::RSAPrivateKey* key, 93 DigestAlgorithm alg, 94 const std::string& subject, 95 uint32 serial_number, 96 base::Time not_valid_before, 97 base::Time not_valid_after, 98 std::string* der_cert); 99 100// Comparator for use in STL algorithms that will sort client certificates by 101// order of preference. 102// Returns true if |a| is more preferable than |b|, allowing it to be used 103// with any algorithm that compares according to strict weak ordering. 104// 105// Criteria include: 106// - Prefer certificates that have a longer validity period (later 107// expiration dates) 108// - If equal, prefer certificates that were issued more recently 109// - If equal, prefer shorter chains (if available) 110class NET_EXPORT_PRIVATE ClientCertSorter { 111 public: 112 ClientCertSorter(); 113 114 bool operator()( 115 const scoped_refptr<X509Certificate>& a, 116 const scoped_refptr<X509Certificate>& b) const; 117 118 private: 119 base::Time now_; 120}; 121 122} // namespace x509_util 123 124} // namespace net 125 126#endif // NET_CERT_X509_UTIL_H_ 127