1 files changed, 15 insertions, 0 deletions
diff --git a/crypto/src/asn1/x509/X509Extensions.cs b/crypto/src/asn1/x509/X509Extensions.cs
index aa5205800..62291a829 100644
--- a/crypto/src/asn1/x509/X509Extensions.cs
+++ b/crypto/src/asn1/x509/X509Extensions.cs
@@ -169,6 +169,21 @@ namespace Org.BouncyCastle.Asn1.X509
          */
         public static readonly DerObjectIdentifier ExpiredCertsOnCrl = new DerObjectIdentifier("2.5.29.60");
 
+        /**
+         * the subject’s alternative public key information
+         */
+        public static readonly DerObjectIdentifier SubjectAltPublicKeyInfo = new DerObjectIdentifier("2.5.29.72");
+
+        /**
+         * the algorithm identifier for the alternative digital signature algorithm.
+         */
+        public static readonly DerObjectIdentifier AltSignatureAlgorithm = new DerObjectIdentifier("2.5.29.73");
+
+        /**
+         * alternative signature shall be created by the issuer using its alternative private key.
+         */
+        public static readonly DerObjectIdentifier AltSignatureValue = new DerObjectIdentifier("2.5.29.74");
+
         private readonly Dictionary<DerObjectIdentifier, X509Extension> m_extensions =
             new Dictionary<DerObjectIdentifier, X509Extension>();
         private readonly List<DerObjectIdentifier> m_ordering;