Check whether or not a certificate is self-signed.

net/cert/x509_certificate_openssl.cc

 // Copyright (c) 2012 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/cert/x509_certificate.h"
 
 #include <openssl/asn1.h>
 #include <openssl/bytestring.h>
 #include <openssl/crypto.h>
 #include <openssl/obj_mac.h>
@@ skipping 18 matching lines @@
 #include "base/logging.h"
 #include "net/android/network_library.h"
 #endif
 
 namespace net {
 
 namespace {
 
 typedef crypto::ScopedOpenSSL<GENERAL_NAMES, GENERAL_NAMES_free>::Type
     ScopedGENERAL_NAMES;
+typedef crypto::ScopedOpenSSL<X509, X509_free>::Type ScopedX509;

[Ryan Sleevi, 2014/10/27 23:33:13]

Unnecessary

[palmer, 2014/10/28 23:13:41]

Done.

 
 void CreateOSCertHandlesFromPKCS7Bytes(
     const char* data, int length,
     X509Certificate::OSCertHandles* handles) {
   crypto::EnsureOpenSSLInit();
   crypto::OpenSSLErrStackTracer err_cleaner(FROM_HERE);
 
   CBS der_data;
   CBS_init(&der_data, reinterpret_cast<const uint8_t*>(data), length);
   STACK_OF(X509)* certs = sk_X509_new_null();
@@ skipping 393 matching lines @@
       X509_NAME* issuer = sk_X509_NAME_value(issuer_names.get(), m);
       if (X509_NAME_cmp(issuer, cert_names[n]) == 0) {
         return true;
       }
     }
   }
 
   return false;
 }
 
+// static
+bool X509Certificate::IsSelfSigned(OSCertHandle cert_handle) {
+  crypto::ScopedEVP_PKEY scoped_key(X509_get_pubkey(cert_handle));
+  if (!scoped_key)
+    return false;
+
+  // NOTE: X509_verify() returns 1 in case of success, 0 or -1 on error.
+  return X509_verify(cert_handle, scoped_key.get()) == 1;
+}
+
 }  // namespace net