Add new functions to handle UPN and email addresses

net/cert/x509_util.h

Index: net/cert/x509_util.h
diff --git a/net/cert/x509_util.h b/net/cert/x509_util.h
index fb8c20f080d3f756256eab328f2f4d70d7a13844..d48a22fa8143af00e067df534058bb7db8e733d3 100644
--- a/net/cert/x509_util.h
+++ b/net/cert/x509_util.h
@@ -31,6 +31,10 @@ enum DigestAlgorithm {
   DIGEST_SHA256
 };
 
+// Microsoft User Principal Name: 1.3.6.1.4.1.311.20.2.3
+const uint8_t kUpnOid[] = {0x2b, 0x6,  0x1,  0x4, 0x1,
+                           0x82, 0x37, 0x14, 0x2, 0x3};

[Ryan Sleevi, 2016/02/27 00:38:45]

I don't like exposing the constant's value in the header; plus this
initialization syntax doesn't provide external linkage but instead duplicates
the constant.

[Kevin Cernekee, 2016/02/27 19:06:23]

Done.

+
 // Creates a public-private keypair and a self-signed certificate.
 // Subject, serial number and validity period are given as parameters.
 // The certificate is signed by the private key in |key|. The key length and