Higher-level API support for Ed25519/Ed448/X25519/X448

1 files changed, 31 insertions, 1 deletions

diff --git a/crypto/src/security/PublicKeyFactory.cs b/crypto/src/security/PublicKeyFactory.cs
index f1b28b774..e39748e45 100644
--- a/crypto/src/security/PublicKeyFactory.cs
+++ b/crypto/src/security/PublicKeyFactory.cs
@@ -5,6 +5,7 @@ using System.Text;
 
 using Org.BouncyCastle.Asn1;
 using Org.BouncyCastle.Asn1.CryptoPro;
+using Org.BouncyCastle.Asn1.EdEC;
 using Org.BouncyCastle.Asn1.Oiw;
 using Org.BouncyCastle.Asn1.Pkcs;
 using Org.BouncyCastle.Asn1.Sec;
@@ -218,12 +219,41 @@ namespace Org.BouncyCastle.Security
 
                 return new Gost3410PublicKeyParameters(y, algParams.PublicKeyParamSet);
             }
+            else if (algOid.Equals(EdECObjectIdentifiers.id_X25519))
+            {
+                return new X25519PublicKeyParameters(GetRawKey(keyInfo, X25519PublicKeyParameters.KeySize), 0);
+            }
+            else if (algOid.Equals(EdECObjectIdentifiers.id_X448))
+            {
+                return new X448PublicKeyParameters(GetRawKey(keyInfo, X448PublicKeyParameters.KeySize), 0);
+            }
+            else if (algOid.Equals(EdECObjectIdentifiers.id_Ed25519))
+            {
+                return new Ed25519PublicKeyParameters(GetRawKey(keyInfo, Ed25519PublicKeyParameters.KeySize), 0);
+            }
+            else if (algOid.Equals(EdECObjectIdentifiers.id_Ed448))
+            {
+                return new Ed448PublicKeyParameters(GetRawKey(keyInfo, Ed448PublicKeyParameters.KeySize), 0);
+            }
             else
             {
-                throw new SecurityUtilityException("algorithm identifier in key not recognised: " + algOid);
+                throw new SecurityUtilityException("algorithm identifier in public key not recognised: " + algOid);
             }
         }
 
+        private static byte[] GetRawKey(SubjectPublicKeyInfo keyInfo, int expectedSize)
+        {
+            /*
+             * TODO[RFC 8422]
+             * - Require keyInfo.Algorithm.Parameters == null?
+             */
+            byte[] result = keyInfo.PublicKeyData.GetOctets();
+            if (expectedSize != result.Length)
+                throw new SecurityUtilityException("public key encoding has incorrect length");
+
+            return result;
+        }
+
         private static bool IsPkcsDHParam(Asn1Sequence seq)
         {
             if (seq.Count == 2)