Add a new ExtractSubjectPublicKeyFromSPKI method to asn1_utils.

net/base/asn1_util.h

Index: net/base/asn1_util.h
diff --git a/net/base/asn1_util.h b/net/base/asn1_util.h
index 0b712985587b8d68424253d0cd8cc4a3c47e4a3d..73f74af4bd8ba79be1b6f6977a4c333b7ae3c50c 100644
--- a/net/base/asn1_util.h
+++ b/net/base/asn1_util.h
@@ -63,6 +63,13 @@ bool GetElement(base::StringPiece* in,
 NET_EXPORT_PRIVATE bool ExtractSPKIFromDERCert(base::StringPiece cert,
                                                base::StringPiece* spki_out);
 
+// ExtractSubjectPublicKeyFromSPKI parses the DER encoded SubjectPublicKeyInfo
+// in |spki| and extracts the bytes of the SubjectPublicKey. On successful
+// return, |spk_out| is set to contain the public key, pointing into |spki|.
+NET_EXPORT_PRIVATE bool ExtractSubjectPublicKeyFromSPKI(
+    base::StringPiece spki,
+    base::StringPiece* spk_out);
+
 // ExtractCRLURLsFromDERCert parses the DER encoded certificate in |cert| and
 // extracts the URL of each CRL. On successful return, the elements of
 // |urls_out| point into |cert|.