From 739ad9b96f8df54351e4020ddc20036921b9a7f1 Mon Sep 17 00:00:00 2001
From: David Hook <dgh@cryptoworkshop.com>
Date: Mon, 27 May 2013 11:19:49 +1000
Subject: added handling of EC keys

---
 .../crypto/util/SubjectPublicKeyInfoFactory.java   | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/main/java/org/bouncycastle/crypto/util/SubjectPublicKeyInfoFactory.java b/src/main/java/org/bouncycastle/crypto/util/SubjectPublicKeyInfoFactory.java
index 125cc9e3..bdc6cbd1 100644
--- a/src/main/java/org/bouncycastle/crypto/util/SubjectPublicKeyInfoFactory.java
+++ b/src/main/java/org/bouncycastle/crypto/util/SubjectPublicKeyInfoFactory.java
@@ -2,15 +2,22 @@ package org.bouncycastle.crypto.util;
 
 import java.io.IOException;
 
+import org.bouncycastle.asn1.ASN1Encodable;
 import org.bouncycastle.asn1.ASN1Integer;
+import org.bouncycastle.asn1.ASN1OctetString;
 import org.bouncycastle.asn1.DERNull;
 import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
 import org.bouncycastle.asn1.pkcs.RSAPublicKey;
 import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
 import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
+import org.bouncycastle.asn1.x9.X962Parameters;
+import org.bouncycastle.asn1.x9.X9ECParameters;
+import org.bouncycastle.asn1.x9.X9ECPoint;
 import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
 import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
 import org.bouncycastle.crypto.params.DSAPublicKeyParameters;
+import org.bouncycastle.crypto.params.ECDomainParameters;
+import org.bouncycastle.crypto.params.ECPublicKeyParameters;
 import org.bouncycastle.crypto.params.RSAKeyParameters;
 
 /**
@@ -39,6 +46,33 @@ public class SubjectPublicKeyInfoFactory
 
             return new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa), new ASN1Integer(pub.getY()));
         }
+        else if (publicKey instanceof ECPublicKeyParameters)
+        {
+            ECPublicKeyParameters pub = (ECPublicKeyParameters)publicKey;
+            ECDomainParameters domainParams = pub.getParameters();
+            ASN1Encodable      params;
+
+            // TODO: need to handle named curves
+            if (domainParams == null)
+            {
+                params = new X962Parameters(DERNull.INSTANCE);      // Implicitly CA
+            }
+            else
+            {
+                X9ECParameters ecP = new X9ECParameters(
+                    domainParams.getCurve(),
+                    domainParams.getG(),
+                    domainParams.getN(),
+                    domainParams.getH(),
+                    domainParams.getSeed());
+
+                params = new X962Parameters(ecP);
+            }
+
+            ASN1OctetString p = (ASN1OctetString)new X9ECPoint(pub.getQ()).toASN1Primitive();
+
+            return new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params), p.getOctets());
+        }
         else
         {
             throw new IOException("key parameters not recognised.");
-- 
cgit v1.2.3