crypto cleanup

core/java/src/net/i2p/crypto/CertUtil.java

 package net.i2p.crypto;
 
 import java.io.File;
-import java.io.FileInputStream;
-import java.io.InputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintWriter;
 import java.security.GeneralSecurityException;
-import java.security.KeyStore;
 import java.security.cert.Certificate;
 import java.security.cert.CertificateException;
 import java.security.cert.CertificateEncodingException;

core/java/src/net/i2p/crypto/DSAEngine.java

@@ -64,7 +64,7 @@ import net.i2p.util.NativeBigInteger;
  *  Params and rv's changed from Hash to SHA1Hash for version 0.8.1
  *  Hash variants of sign() and verifySignature() restored in 0.8.3, required by Syndie.
  *
- *  As of 0.9.9, certain methods support ECDSA keys and signatures, i.e. all types
+ *  As of 0.9.9, certain methods support RSA and ECDSA keys and signatures, i.e. all types
  *  specified in SigType. The type is specified by the getType() method in
  *  Signature, SigningPublicKey, and SigningPrivateKey. See Javadocs for individual
  *  methods for the supported types. Methods encountering an unsupported type

core/java/src/net/i2p/crypto/KeyGenerator.java

@@ -15,9 +15,6 @@ import java.security.InvalidKeyException;
 import java.security.KeyPair;
 import java.security.KeyPairGenerator;
 import java.security.ProviderException;
-import java.security.interfaces.ECPrivateKey;
-import java.security.interfaces.ECPublicKey;
-import java.security.spec.ECPoint;
 
 import net.i2p.I2PAppContext;
 import net.i2p.data.Hash;

core/java/src/net/i2p/crypto/SigUtil.java

@@ -171,7 +171,7 @@ class SigUtil {
         return (ECPublicKey) kf.generatePublic(ks);
     }
 
-    public static ECPrivateKey cvtToJavaECKey(SigningPrivateKey pk)
+    private static ECPrivateKey cvtToJavaECKey(SigningPrivateKey pk)
                               throws GeneralSecurityException {
         SigType type = pk.getType();
         int len = type.getPubkeyLen();