Check whether or not a certificate is self-signed.

net/cert/x509_certificate_win.cc

Index: net/cert/x509_certificate_win.cc
diff --git a/net/cert/x509_certificate_win.cc b/net/cert/x509_certificate_win.cc
index df263d8fa90838d9af5fb7db8e72b0eed0ee8f30..0b4c46b00dbcf228350acc120e1913d200053ad6 100644
--- a/net/cert/x509_certificate_win.cc
+++ b/net/cert/x509_certificate_win.cc
@@ -472,4 +472,17 @@ bool X509Certificate::IsIssuedByEncoded(
   return false;
 }
 
+// static
+bool X509Certificate::IsSelfSigned(OSCertHandle cert_handle) {
+  return !!CryptVerifyCertificateSignatureEx(
+      NULL,
+      X509_ASN_ENCODING,
+      CRYPT_VERIFY_CERT_SIGN_SUBJECT_CERT,
+      reinterpret_cast<void*>(const_cast<PCERT_CONTEXT>(cert_handle)),
+      CRYPT_VERIFY_CERT_SIGN_ISSUER_CERT,
+      reinterpret_cast<void*>(const_cast<PCERT_CONTEXT>(cert_handle)),
+      0,
+      NULL);
+}
+
 }  // namespace net