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255 lines
7.5 KiB
Java
255 lines
7.5 KiB
Java
/* SignatureSpi.java --- Signature Service Provider Interface
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security;
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import java.security.spec.AlgorithmParameterSpec;
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/**
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SignatureSpi defines the Service Provider Interface (SPI)
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for the Signature class. The signature class provides an
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interface to a digital signature algorithm. Digital signatures
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are used for authentication and integrity of data.
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@author Mark Benvenuto <ivymccough@worldnet.att.net>
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@since JDK 1.2
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*/
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public abstract class SignatureSpi
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{
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/**
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Source of randomness
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*/
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protected SecureRandom appRandom;
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/**
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Creates a new instance of SignatureSpi.
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*/
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public SignatureSpi()
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{
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appRandom = null;
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}
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/**
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Initializes this class with the public key for
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verification purposes.
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@param publicKey the public key to verify with
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@throws InvalidKeyException invalid key
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*/
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protected abstract void engineInitVerify(PublicKey publicKey)
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throws InvalidKeyException;
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/**
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Initializes this class with the private key for
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signing purposes.
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@param privateKey the private key to sign with
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@throws InvalidKeyException invalid key
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*/
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protected abstract void engineInitSign(PrivateKey privateKey)
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throws InvalidKeyException;
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/**
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Initializes this class with the private key and source
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of randomness for signing purposes.
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This cannot be abstract backward compatibility reasons
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@param privateKey the private key to sign with
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@param random Source of randomness
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@throws InvalidKeyException invalid key
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@since JDK 1.2
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*/
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protected void engineInitSign(PrivateKey privateKey, SecureRandom random)
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throws InvalidKeyException
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{
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appRandom = random;
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engineInitSign(privateKey);
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}
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/**
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Updates the data to be signed or verified with the specified
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byte.
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@param b byte to update with
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@throws SignatureException Engine not properly initialized
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*/
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protected abstract void engineUpdate(byte b) throws SignatureException;
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/**
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Updates the data to be signed or verified with the specified
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bytes.
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@param b array of bytes
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@param off the offset to start at in the array
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@param len the length of the bytes to use in the array
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@throws SignatureException engine not properly initialized
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*/
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protected abstract void engineUpdate(byte[] b, int off, int len)
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throws SignatureException;
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/**
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Returns the signature bytes of all the data fed to this class.
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The format of the output depends on the underlying signature
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algorithm.
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@return the signature
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@throws SignatureException engine not properly initialized
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*/
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protected abstract byte[] engineSign() throws SignatureException;
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/**
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Generates signature bytes of all the data fed to this class
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and outputs it to the passed array. The format of the
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output depends on the underlying signature algorithm.
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This cannot be abstract backward compatibility reasons.
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After calling this method, the signature is reset to its
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initial state and can be used to generate additional
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signatures.
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@param outbuff array of bytes
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@param offset the offset to start at in the array
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@param len the length of the bytes to put into the array.
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Neither this method or the GNU provider will
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return partial digests. If len is less than the
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signature length, this method will throw
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SignatureException. If it is greater than or equal
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then it is ignored.
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@return number of bytes in outbuf
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@throws SignatureException engine not properly initialized
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@since JDK 1.2
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*/
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protected int engineSign(byte[] outbuf, int offset, int len)
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throws SignatureException
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{
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byte tmp[] = engineSign();
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if (tmp.length > len)
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throw new SignatureException("Invalid Length");
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System.arraycopy(outbuf, offset, tmp, 0, tmp.length);
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return tmp.length;
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}
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/**
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Verifies the passed signature.
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@param sigBytes the signature bytes to verify
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@return true if verified, false otherwise
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@throws SignatureException engine not properly initialized
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or wrong signature
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*/
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protected abstract boolean engineVerify(byte[] sigBytes)
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throws SignatureException;
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/**
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Sets the specified algorithm parameter to the specified value.
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@param param parameter name
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@param value parameter value
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@throws InvalidParameterException invalid parameter, parameter
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already set and cannot set again, a security exception,
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etc.
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@deprecated use the other setParameter
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*/
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protected abstract void engineSetParameter(String param, Object value)
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throws InvalidParameterException;
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/**
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Sets the signature engine with the specified
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AlgorithmParameterSpec;
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This cannot be abstract backward compatibility reasons
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By default this always throws UnsupportedOperationException
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if not overridden;
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@param params the parameters
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@throws InvalidParameterException invalid parameter, parameter
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already set and cannot set again, a security exception,
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etc.
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*/
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protected void engineSetParameter(AlgorithmParameterSpec params)
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throws InvalidAlgorithmParameterException
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{
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throw new UnsupportedOperationException();
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}
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/**
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Gets the value for the specified algorithm parameter.
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@param param parameter name
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@return parameter value
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@throws InvalidParameterException invalid parameter
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@deprecated use the other getParameter
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*/
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protected abstract Object engineGetParameter(String param)
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throws InvalidParameterException;
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/**
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Returns a clone if cloneable.
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@return a clone if cloneable.
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@throws CloneNotSupportedException if the implementation does
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not support cloning
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*/
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public Object clone() throws CloneNotSupportedException
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{
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throw new CloneNotSupportedException();
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}
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}
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