Added new ECDSA class depend for CryptoEngine.

src/jpcsp/crypto/ECDSA.java

@@ -0,0 +1,89 @@
+/*
+This file is part of jpcsp.
+
+Jpcsp is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Jpcsp is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Jpcsp.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package jpcsp.crypto;
+
+import java.math.BigInteger;
+import java.security.PublicKey;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.SecureRandom;
+import org.bouncycastle.math.ec.ECCurve;
+import org.bouncycastle.jce.spec.ECParameterSpec;
+import org.bouncycastle.jce.spec.ECPublicKeySpec;
+import org.bouncycastle.jce.spec.ECPrivateKeySpec;
+import org.bouncycastle.util.encoders.Hex;
+
+public class ECDSA {
+    private KeyPair keyPair;
+    private ECCurve curve;
+    private ECParameterSpec spec;
+    private KeyPairGenerator g;
+    private KeyFactory f;
+
+    public ECDSA() {
+    }
+
+    public void setCurve() {
+        try {
+            curve = new ECCurve.Fp(
+                    new BigInteger("FFFFFFFFFFFFFFFF00000001FFFFFFFFFFFFFFFF", 16),  // p 
+                    new BigInteger("FFFFFFFFFFFFFFFF00000001FFFFFFFFFFFFFFFC", 16),  // a
+                    new BigInteger("A68BEDC33418029C1D3CE33B9A321FCCBB9E0F0B", 16)); // b
+            
+            spec = new ECParameterSpec(curve, 
+                    curve.decodePoint(Hex.decode("128EC456487FD8FDF64E2437BC0A1F6D5AFDE2C5958557EB1DB001260425524DBC379D5AC5F4ADF")), // G
+                    new BigInteger("00FFFFFFFFFFFFFFFEFFFFB5AE3C523E63944F2127")); // n
+            
+            g = KeyPairGenerator.getInstance("ECDSA", "BC");
+            f = KeyFactory.getInstance("ECDSA", "BC");
+            g.initialize(spec, new SecureRandom());
+            
+            keyPair = g.generateKeyPair();
+        } catch (Exception e) {
+        }
+    }
+    
+    public void sign(byte[] hash, byte[] priv, byte[] R, byte[] S) {
+        // TODO
+    }
+    
+    public void verify(byte[] hash, byte[] pub, byte[] R, byte[] S) {
+        // TODO
+    }
+    
+    public byte[] getPrivateKey() {
+        return keyPair.getPrivate().getEncoded();
+    }
+    
+    public byte[] getPublicKey() {
+        return keyPair.getPublic().getEncoded();
+    }
+    
+    public byte[] multiplyPublicKey(byte[] pub, byte[] priv) {
+        PublicKey multPubKey = null;
+        ECPrivateKeySpec privateKeySpec = new ECPrivateKeySpec(new BigInteger(priv), spec);
+        ECPublicKeySpec publicKeySpec = new ECPublicKeySpec(curve.decodePoint(pub), spec);
+        ECPublicKeySpec newPublicKeySpec = new ECPublicKeySpec(publicKeySpec.getQ().multiply(privateKeySpec.getD()), spec);
+        try {
+            multPubKey = f.generatePublic(newPublicKeySpec);
+        } catch (Exception e) {  
+        }       
+        return multPubKey.getEncoded();
+    }
+}