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/* Copyright (C) 2000 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.security;
/**
* @author Tom Tromey <tromey@cygnus.com>
* @date February 11, 2000.
*/
/**
* Written using on-line Java Platform 1.1 API Specification.
* Status: Believed complete and correct to 1.1 spec.
* It is known not to comply with the 1.2 spec.
*/
public abstract class Signature
{
protected Signature (String name)
{
state = UNINITIALIZED;
this.name = name;
}
public static Signature getInstance (String algorithm)
throws NoSuchAlgorithmException
{
String name = "Signature." + algorithm;
Provider[] provs = Security.getProviders ();
for (int i = 0; i < provs.length; ++i)
{
String val = provs[i].getProperty (name);
if (val != null)
{
try
{
return (Signature) Class.forName(val).newInstance ();
}
catch (Throwable _)
{
// We just ignore failures.
}
}
}
throw new NoSuchAlgorithmException (algorithm);
}
public static Signature getInstance (String algorithm, String provider)
throws NoSuchAlgorithmException, NoSuchProviderException
{
String name = "Signature." + algorithm;
Provider p = Security.getProvider (provider);
if (p == null)
throw new NoSuchProviderException (provider);
String val = p.getProperty (name);
if (val != null)
{
try
{
return (Signature) Class.forName(val).newInstance ();
}
catch (Throwable _)
{
// Nothing.
}
}
throw new NoSuchAlgorithmException (algorithm);
}
public final void initVerify (PublicKey publicKey)
throws InvalidKeyException
{
engineInitVerify (publicKey);
}
public final void initSign (PrivateKey privateKey)
throws InvalidKeyException
{
engineInitSign (privateKey);
}
public final byte[] sign ()
throws SignatureException
{
return engineSign ();
}
public final boolean verify (byte[] signature)
throws SignatureException
{
return engineVerify (signature);
}
public final void update (byte b)
throws SignatureException
{
engineUpdate (b);
}
public final void update (byte[] data)
throws SignatureException
{
engineUpdate (data, 0, data.length);
}
public final void update (byte[] data, int off, int len)
throws SignatureException
{
engineUpdate (data, off, len);
}
public final String getAlgorithm ()
{
return name;
}
public String toString ()
{
// There is no spec for this. FIXME: this is a bad choice.
return name + "; state = " + state;
}
public final void setParameter (String param, Object value)
throws InvalidParameterException
{
engineSetParameter (param, value);
}
public final Object getParameter (String param)
throws InvalidParameterException
{
return engineGetParameter (param);
}
protected abstract void engineInitVerify (PublicKey publicKey)
throws InvalidKeyException;
protected abstract void engineInitSign (PrivateKey privateKey)
throws InvalidKeyException;
protected abstract void engineUpdate (byte b)
throws SignatureException;
protected abstract void engineUpdate (byte[] b, int off, int len)
throws SignatureException;
protected abstract byte[] engineSign ()
throws SignatureException;
protected abstract boolean engineVerify (byte[] sigBytes)
throws SignatureException;
protected abstract void engineSetParameter (String param, Object value)
throws InvalidParameterException;
protected abstract Object engineGetParameter (String param)
throws InvalidParameterException;
public Object clone() throws CloneNotSupportedException
{
return super.clone ();
}
protected static final int UNINITIALIZED = 0;
protected static final int SIGN = 2;
protected static final int VERIFY = 3;
// Current state.
protected int state;
// Name of this object.
private String name;
}
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