Add parsing code for RFC 5280 PolicyConstraints.

net/cert/internal/parse_certificate.h

Index: net/cert/internal/parse_certificate.h
diff --git a/net/cert/internal/parse_certificate.h b/net/cert/internal/parse_certificate.h
index a164682eb49e8e673c33c27c2b24f41383acafd9..72fa22038efec3061a6a0e692bdac87ce525ee4a 100644
--- a/net/cert/internal/parse_certificate.h
+++ b/net/cert/internal/parse_certificate.h
@@ -457,6 +457,20 @@ NET_EXPORT bool ParseAuthorityInfoAccess(
     std::vector<base::StringPiece>* out_ca_issuers_uris,
     std::vector<base::StringPiece>* out_ocsp_uris) WARN_UNUSED_RESULT;
 
+struct ParsedPolicyConstraints {

[mattm, 2017/05/10 20:01:23]

we don't really have a well-defined organization currently, but do you think it
would make sense to put the policy constraints stuff in
net/cert/internal/certificate_policies instead of parse_certificate?

[eroman, 2017/05/13 01:10:55]

Done.

+  bool has_require_explicit_policy = false;
+  uint8_t require_explicit_policy = 0;
+
+  bool has_inhibit_policy_mapping = false;
+  uint8_t inhibit_policy_mapping = 0;
+};
+
+// Parses a PolicyConstraints SEQUENCE as defined by RFC 5280. Returns true on
+// success, and sets |out|.
+NET_EXPORT bool ParsePolicyConstraints(const der::Input& policy_constraints_tlv,
+                                       ParsedPolicyConstraints* out)
+    WARN_UNUSED_RESULT;
+
 }  // namespace net
 
 #endif  // NET_CERT_INTERNAL_PARSE_CERTIFICATE_H_