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Makefile.in: Rebuilt.

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* Makefile.in: Rebuilt.
	* Makefile.am (ordinary_java_source_files): Added new files.
	* java/security/AlgorithmParameterGenerator.java,
	java/security/AlgorithmParameters.java, java/security/Engine.java,
	java/security/Identity.java, java/security/IdentityScope.java,
	java/security/KeyFactory.java,
	java/security/KeyPairGenerator.java, java/security/KeyStore.java,
	java/security/MessageDigest.java, java/security/Policy.java,
	java/security/ProtectionDomain.java,
	java/security/SecureRandom.java, java/security/Security.java,
	java/security/Signature.java, java/security/SignatureSpi.java,
	java/security/SignedObject.java, java/security/Signer.java,
	java/security/interfaces/RSAMultiPrimePrivateCrtKey.java,
	java/security/spec/PSSParameterSpec.java,
	java/security/spec/RSAMultiPrimePrivateCrtKeySpec.java,
	java/security/spec/RSAOtherPrimeInfo.java: New versions from
	Classpath.

From-SVN: r65829
This commit is contained in:
Tom Tromey
2003-04-19 20:54:55 +00:00
committed by Tom Tromey
parent 9e9e204234
commit 7451c1559e
24 changed files with 3797 additions and 1898 deletions
Download Patch File Download Diff File Expand all files Collapse all files
libjava/java/security/Signature.java
+369 -261
View File
@@ -1,5 +1,5 @@
/* Signature.java --- Signature Class
Copyright (C) 1999, 2002 Free Software Foundation, Inc.
Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
This file is part of GNU Classpath.
@@ -36,73 +36,113 @@ obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */
package java.security;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.security.spec.AlgorithmParameterSpec;
/**
Signature is used to provide an interface to digital signature
algorithms. Digital signatures provide authentication and data
integrity of digital data.
The GNU provider provides the NIST standard DSA which uses DSA
and SHA-1. It can be specified by SHA/DSA, SHA-1/DSA or its
OID. If the RSA signature algorithm is provided then
it could be MD2/RSA. MD5/RSA, or SHA-1/RSA. The algorithm must
be specified because there is no default.
Signature provides implementation-independent algorithms which
are requested by the user through getInstance. It can be
requested by specifying just the algorithm name or by
specifying both the algorithm name and provider name.
The three phases of using Signature are:
1. Initialing
* It must be initialized with a private key for signing.
* It must be initialized with a public key for verifying.
2. Updating
Update the bytes for signing or verifying with calls to update.
3. Signing or Verify the signature on the currently stored
bytes by calling sign or verify.
@author Mark Benvenuto <ivymccough@worldnet.att.net>
@since JDK 1.1
* <p>This <code>Signature</code> class is used to provide applications the
* functionality of a digital signature algorithm. Digital signatures are used
* for authentication and integrity assurance of digital data.</p>
*
* <p>The signature algorithm can be, among others, the NIST standard <i>DSS</i>,
* using <i>DSA</i> and <i>SHA-1</i>. The <i>DSA</i> algorithm using the
* <i>SHA-1</i> message digest algorithm can be specified as <code>SHA1withDSA
* </code>. In the case of <i>RSA</i>, there are multiple choices for the
* message digest algorithm, so the signing algorithm could be specified as, for
* example, <code>MD2withRSA</code>, <code>MD5withRSA</code>, or
* <code>SHA1withRSA</code>. The algorithm name must be specified, as there is
* no default.</p>
*
* <p>Like other algorithm-based classes in Java Security, <code>Signature</code>
* provides implementation-independent algorithms, whereby a caller (application
* code) requests a particular signature algorithm and is handed back a properly
* initialized <code>Signature</code> object. It is also possible, if desired,
* to request a particular algorithm from a particular provider. See the
* <code>getInstance()</code> methods.</p>
*
* <p>Thus, there are two ways to request a <code>Signature</code> algorithm
* object: by specifying either just an algorithm name, or both an algorithm
* name and a package provider.</p>
*
* <p>If just an algorithm name is specified, the system will determine if there
* is an implementation of the algorithm requested available in the environment,
* and if there is more than one, if there is a preferred one.</p>
*
* <p>If both an algorithm name and a package provider are specified, the system
* will determine if there is an implementation of the algorithm in the package
* requested, and throw an exception if there is not.</p>
*
* <p>A <code>Signature</code> object can be used to generate and verify digital
* signatures.</p>
*
* <p>There are three phases to the use of a <code>Signature</code> object for
* either signing data or verifying a signature:</p>
*
* <ol>
* <li>Initialization, with either
* <ul>
* <li>a public key, which initializes the signature for verification
* (see <code>initVerify()</code>), or</li>
* <li>a private key (and optionally a Secure Random Number Generator),
* which initializes the signature for signing (see
* {@link #initSign(PrivateKey)} and {@link #initSign(PrivateKey, SecureRandom)}
* ).</li>
* </ul></li>
* <li>Updating<br/>
* Depending on the type of initialization, this will update the bytes to
* be signed or verified. See the update methods.<br/></li>
* <li>Signing or Verifying a signature on all updated bytes. See the
* <code>sign()</code> methods and the <code>verify()</code> method.</li>
* </ol>
*
* <p>Note that this class is abstract and extends from {@link SignatureSpi} for
* historical reasons. Application developers should only take notice of the
* methods defined in this <code>Signature</code> class; all the methods in the
* superclass are intended for cryptographic service providers who wish to
* supply their own implementations of digital signature algorithms.
*
* @author Mark Benvenuto <ivymccough@worldnet.att.net>
*/
public abstract class Signature extends SignatureSpi
{
/**
Possible state variable which signifies if it has not been
initialized.
*/
protected static final int UNINITIALIZED = 1;
/** Service name for signatures. */
private static final String SIGNATURE = "Signature";
/**
Possible state variable which signifies if it has been
initialized for signing.
* Possible <code>state</code> value, signifying that this signature object
* has not yet been initialized.
*/
protected static final int UNINITIALIZED = 0;
// Constructor.
// ------------------------------------------------------------------------
/**
* Possible <code>state</code> value, signifying that this signature object
* has been initialized for signing.
*/
protected static final int SIGN = 2;
/**
Possible state variable which signifies if it has been
initialized for verifying.
* Possible <code>state</code> value, signifying that this signature object
* has been initialized for verification.
*/
protected static final int VERIFY = 3;
/**
State of this Signature class.
*/
/** Current state of this signature object. */
protected int state = UNINITIALIZED;
private String algorithm;
Provider provider;
/**
Creates a new signature for this algorithm.
@param algorithm the algorithm to use
* Creates a <code>Signature</code> object for the specified algorithm.
*
* @param algorithm the standard string name of the algorithm. See Appendix A
* in the Java Cryptography Architecture API Specification &amp; Reference for
* information about standard algorithm names.
*/
protected Signature(String algorithm)
{
@@ -111,21 +151,24 @@ public abstract class Signature extends SignatureSpi
}
/**
Gets an instance of the Signature class representing
the specified signature. If the algorithm is not found then,
it throws NoSuchAlgorithmException.
@param algorithm the name of signature algorithm to choose
@return a Signature repesenting the desired algorithm
@throws NoSuchAlgorithmException if the algorithm is not implemented by
providers
* Generates a <code>Signature</code> object that implements the specified
* digest algorithm. If the default provider package provides an
* implementation of the requested digest algorithm, an instance of
* <code>Signature</code> containing that implementation is returned. If the
* algorithm is not available in the default package, other packages are
* searched.
*
* @param algorithm the standard name of the algorithm requested. See Appendix
* A in the Java Cryptography Architecture API Specification &amp; Reference
* for information about standard algorithm names.
* @return the new Signature object.
* @throws NoSuchAlgorithmException if the algorithm is not available in the
* environment.
*/
public static Signature getInstance(String algorithm)
throws NoSuchAlgorithmException
{
Provider[] p = Security.getProviders();
for (int i = 0; i < p.length; i++)
{
try
@@ -138,24 +181,30 @@ public abstract class Signature extends SignatureSpi
throw new NoSuchAlgorithmException(algorithm);
}
/**
Gets an instance of the Signature class representing
the specified signature from the specified provider. If the
algorithm is not found then, it throws NoSuchAlgorithmException.
If the provider is not found, then it throws
NoSuchProviderException.
@param algorithm the name of signature algorithm to choose
@param provider the name of the provider to find the algorithm in
@return a Signature repesenting the desired algorithm
@throws NoSuchAlgorithmException if the algorithm is not implemented by
the provider
@throws NoSuchProviderException if the provider is not found
/**
* Generates a <code>Signature</code> object implementing the specified
* algorithm, as supplied from the specified provider, if such an algorithm
* is available from the provider.
*
* @param algorithm the name of the algorithm requested. See Appendix A in
* the Java Cryptography Architecture API Specification &amp; Reference for
* information about standard algorithm names.
* @param provider the name of the provider.
* @return the new <code>Signature</code> object.
* @throws NoSuchAlgorithmException if the algorithm is not available in the
* package supplied by the requested provider.
* @throws NoSuchProviderException if the provider is not available in the
* environment.
* @throws IllegalArgumentException if the provider name is <code>null</code>
* or empty.
* @see Provider
*/
public static Signature getInstance(String algorithm, String provider)
throws NoSuchAlgorithmException, NoSuchProviderException
{
if (provider == null || provider.length() == 0)
throw new IllegalArgumentException("Illegal provider");
Provider p = Security.getProvider(provider);
if (p == null)
throw new NoSuchProviderException(provider);
@@ -163,69 +212,54 @@ public abstract class Signature extends SignatureSpi
return getInstance(algorithm, p);
}
private static Signature getInstance(String algorithm, Provider p)
/**
* Generates a <code>Signature</code> object implementing the specified
* algorithm, as supplied from the specified provider, if such an algorithm
* is available from the provider. Note: the provider doesn't have to be
* registered.
*
* @param algorithm the name of the algorithm requested. See Appendix A in
* the Java Cryptography Architecture API Specification &amp; Reference for
* information about standard algorithm names.
* @param provider the provider.
* @return the new <code>Signature</code> object.
* @throws NoSuchAlgorithmException if the <code>algorithm</code> is not
* available in the package supplied by the requested <code>provider</code>.
* @throws IllegalArgumentException if the <code>provider</code> is
* <code>null</code>.
* @since 1.4
* @see Provider
*/
public static Signature getInstance(String algorithm, Provider provider)
throws NoSuchAlgorithmException
{
// try the name as is
String className = p.getProperty("Signature." + algorithm);
if (className == null) { // try all uppercase
String upper = algorithm.toUpperCase();
className = p.getProperty("Signature." + upper);
if (className == null) { // try if it's an alias
String alias = p.getProperty("Alg.Alias.Signature." + algorithm);
if (alias == null) {
alias = p.getProperty("Alg.Alias.Signature." + upper);
if (alias == null) { // spit the dummy
throw new NoSuchAlgorithmException(algorithm);
}
}
className = p.getProperty("Signature." + alias);
if (className == null) {
throw new NoSuchAlgorithmException(algorithm);
}
}
}
return getInstance(className, algorithm, p);
}
if (provider == null)
throw new IllegalArgumentException("Illegal provider");
private static Signature getInstance(String classname,
String algorithm,
Provider provider)
throws NoSuchAlgorithmException
{
try
{
Object o = Class.forName(classname).newInstance();
Signature sig;
if (o instanceof SignatureSpi)
sig = new DummySignature((SignatureSpi) o, algorithm);
else
{
sig = (Signature) o;
sig.algorithm = algorithm;
}
Signature result = null;
Object o = Engine.getInstance(SIGNATURE, algorithm, provider);
sig.provider = provider;
return sig;
}
catch (ClassNotFoundException cnfe)
if (o instanceof SignatureSpi)
{
throw new NoSuchAlgorithmException("Class not found");
result = new DummySignature((SignatureSpi) o, algorithm);
}
catch (InstantiationException ie)
else if (o instanceof Signature)
{
throw new NoSuchAlgorithmException("Class instantiation failed");
result = (Signature) o;
result.algorithm = algorithm;
}
catch (IllegalAccessException iae)
else
{
throw new NoSuchAlgorithmException("Illegal Access");
throw new NoSuchAlgorithmException(algorithm);
}
result.provider = provider;
return result;
}
/**
Gets the provider that the Signature is from.
@return the provider of this Signature
* Returns the provider of this signature object.
*
* @return the provider of this signature object.
*/
public final Provider getProvider()
{
@@ -233,12 +267,12 @@ public abstract class Signature extends SignatureSpi
}
/**
Initializes this class with the public key for
verification purposes.
@param publicKey the public key to verify with
@throws InvalidKeyException invalid key
* Initializes this object for verification. If this method is called again
* with a different argument, it negates the effect of this call.
*
* @param publicKey the public key of the identity whose signature is going
* to be verified.
* @throws InvalidKeyException if the key is invalid.
*/
public final void initVerify(PublicKey publicKey) throws InvalidKeyException
{
@@ -247,39 +281,43 @@ public abstract class Signature extends SignatureSpi
}
/**
Verify Signature with a certificate. This is a FIPS 140-1 compatible method
since it verifies a signature with a certificate.
If the certificate is an X.509 certificate, has a KeyUsage parameter and
the parameter indicates this key is not to be used for signing then an
error is returned.
@param certificate a certificate containing a public key to verify with
* <p>Initializes this object for verification, using the public key from the
* given certificate.</p>
*
* <p>If the certificate is of type <i>X.509</i> and has a <i>key usage</i>
* extension field marked as <i>critical</i>, and the value of the <i>key
* usage</i> extension field implies that the public key in the certificate
* and its corresponding private key are not supposed to be used for digital
* signatures, an {@link InvalidKeyException} is thrown.</p>
*
* @param certificate the certificate of the identity whose signature is
* going to be verified.
* @throws InvalidKeyException if the public key in the certificate is not
* encoded properly or does not include required parameter information or
* cannot be used for digital signature purposes.
*/
public final void initVerify(java.security.cert.Certificate certificate)
public final void initVerify(Certificate certificate)
throws InvalidKeyException
{
state = VERIFY;
if (certificate.getType().equals("X509"))
{
java.security.cert.X509Certificate cert =
(java.security.cert.X509Certificate) certificate;
X509Certificate cert = (X509Certificate) certificate;
boolean[]array = cert.getKeyUsage();
if (array != null && array[0] == false)
throw new InvalidKeyException
("KeyUsage of this Certificate indicates it cannot be used for digital signing");
throw new InvalidKeyException(
"KeyUsage of this Certificate indicates it cannot be used for digital signing");
}
this.initVerify(certificate.getPublicKey());
}
/**
Initializes this class with the private key for
signing purposes.
@param privateKey the private key to sign with
@throws InvalidKeyException invalid key
* Initialize this object for signing. If this method is called again with a
* different argument, it negates the effect of this call.
*
* @param privateKey the private key of the identity whose signature is going
* to be generated.
* @throws InvalidKeyException if the key is invalid.
*/
public final void initSign(PrivateKey privateKey) throws InvalidKeyException
{
@@ -288,15 +326,13 @@ public abstract class Signature extends SignatureSpi
}
/**
Initializes this class with the private key and source
of randomness for signing purposes.
@param privateKey the private key to sign with
@param random Source of randomness
@throws InvalidKeyException invalid key
@since JDK 1.2
* Initialize this object for signing. If this method is called again with a
* different argument, it negates the effect of this call.
*
* @param privateKey the private key of the identity whose signature is going
* to be generated.
* @param random the source of randomness for this signature.
* @throws InvalidKeyException if the key is invalid.
*/
public final void initSign(PrivateKey privateKey, SecureRandom random)
throws InvalidKeyException
@@ -305,91 +341,137 @@ public abstract class Signature extends SignatureSpi
engineInitSign(privateKey, random);
}
/**
Returns the signature bytes of all the data fed to this class.
The format of the output depends on the underlying signature
algorithm.
@return the signature
@throws SignatureException engine not properly initialized
* <p>Returns the signature bytes of all the data updated. The format of the
* signature depends on the underlying signature scheme.</p>
*
* <p>A call to this method resets this signature object to the state it was
* in when previously initialized for signing via a call to
* <code>initSign(PrivateKey)</code>. That is, the object is reset and
* available to generate another signature from the same signer, if desired,
* via new calls to <code>update()</code> and <code>sign()</code>.</p>
*
* @return the signature bytes of the signing operation's result.
* @throws SignatureException if this signature object is not initialized
* properly.
*/
public final byte[] sign() throws SignatureException
{
if (state == SIGN)
{
state = UNINITIALIZED;
return engineSign();
state = UNINITIALIZED;
return engineSign();
}
else
throw new SignatureException();
}
/**
Generates signature bytes of all the data fed to this class
and outputs it to the passed array. The format of the
output depends on the underlying signature algorithm.
After calling this method, the signature is reset to its
initial state and can be used to generate additional
signatures.
@param outbuf array of bytes
@param offset the offset to start at in the array
@param len the length of the bytes to put into the array.
Neither this method or the GNU provider will
return partial digests. If len is less than the
signature length, this method will throw
SignatureException. If it is greater than or equal
then it is ignored.
@return number of bytes in outbuf
@throws SignatureException engine not properly initialized
@since JDK 1.2
* <p>Finishes the signature operation and stores the resulting signature
* bytes in the provided buffer <code>outbuf</code>, starting at <code>offset
* </code>. The format of the signature depends on the underlying signature
* scheme.</p>
*
* <p>This signature object is reset to its initial state (the state it was
* in after a call to one of the <code>initSign()</code> methods) and can be
* reused to generate further signatures with the same private key.</p>
*
* @param outbuf buffer for the signature result.
* @param offset offset into outbuf where the signature is stored.
* @param len number of bytes within outbuf allotted for the signature.
* @return the number of bytes placed into outbuf.
* @throws SignatureException if an error occurs or len is less than the
* actual signature length.
* @since 1.2
*/
public final int sign(byte[] outbuf, int offset, int len)
throws SignatureException
{
if (state == SIGN)
{
state = UNINITIALIZED;
return engineSign(outbuf, offset, len);
state = UNINITIALIZED;
return engineSign(outbuf, offset, len);
}
else
throw new SignatureException();
}
/**
Verifies the passed signature.
@param signature the signature bytes to verify
@return true if verified, false otherwise
@throws SignatureException engine not properly initialized
or wrong signature
* <p>Verifies the passed-in signature.</p>
*
* <p>A call to this method resets this signature object to the state it was
* in when previously initialized for verification via a call to
* <code>initVerify(PublicKey)</code>. That is, the object is reset and
* available to verify another signature from the identity whose public key
* was specified in the call to <code>initVerify()</code>.</p>
*
* @param signature the signature bytes to be verified.
* @return <code>true</code> if the signature was verified, <code>false</code>
* if not.
* @throws SignatureException if this signature object is not initialized
* properly, or the passed-in signature is improperly encoded or of the wrong
* type, etc.
*/
public final boolean verify(byte[]signature) throws SignatureException
{
if (state == VERIFY)
{
state = UNINITIALIZED;
return engineVerify(signature);
state = UNINITIALIZED;
return engineVerify(signature);
}
else
throw new SignatureException();
}
/**
Updates the data to be signed or verified with the specified
byte.
* <p>Verifies the passed-in <code>signature</code> in the specified array of
* bytes, starting at the specified <code>offset</code>.</p>
*
* <p>A call to this method resets this signature object to the state it was
* in when previously initialized for verification via a call to
* <code>initVerify(PublicKey)</code>. That is, the object is reset and
* available to verify another signature from the identity whose public key
* was specified in the call to <code>initVerify()</code>.</p>
*
* @param signature the signature bytes to be verified.
* @param offset the offset to start from in the array of bytes.
* @param length the number of bytes to use, starting at offset.
* @return <code>true</code> if the signature was verified, <code>false</code>
* if not.
* @throws SignatureException if this signature object is not initialized
* properly, or the passed-in <code>signature</code> is improperly encoded or
* of the wrong type, etc.
* @throws IllegalArgumentException if the <code>signature</code> byte array
* is <code>null</code>, or the <code>offset</code> or <code>length</code> is
* less than <code>0</code>, or the sum of the <code>offset</code> and
* <code>length</code> is greater than the length of the <code>signature</code>
* byte array.
*/
public final boolean verify(byte[] signature, int offset, int length)
throws SignatureException
{
if (state != VERIFY)
throw new SignatureException("illegal state");
@param b byte to update with
if (signature == null)
throw new IllegalArgumentException("signaure is null");
if (offset < 0)
throw new IllegalArgumentException("offset is less than 0");
if (length < 0)
throw new IllegalArgumentException("length is less than 0");
if (offset + length < signature.length)
throw new IllegalArgumentException("range is out of bounds");
@throws SignatureException Engine not properly initialized
state = UNINITIALIZED;
return engineVerify(signature, offset, length);
}
/**
* Updates the data to be signed or verified by a byte.
*
* @param b the byte to use for the update.
* @throws SignatureException if this signature object is not initialized
* properly.
*/
public final void update(byte b) throws SignatureException
{
@@ -400,12 +482,12 @@ public abstract class Signature extends SignatureSpi
}
/**
Updates the data to be signed or verified with the specified
bytes.
@param data array of bytes
@throws SignatureException engine not properly initialized
* Updates the data to be signed or verified, using the specified array of
* bytes.
*
* @param data the byte array to use for the update.
* @throws SignatureException if this signature object is not initialized
* properly.
*/
public final void update(byte[]data) throws SignatureException
{
@@ -416,14 +498,14 @@ public abstract class Signature extends SignatureSpi
}
/**
Updates the data to be signed or verified with the specified
bytes.
@param data array of bytes
@param off the offset to start at in the array
@param len the length of the bytes to use in the array
@throws SignatureException engine not properly initialized
* Updates the data to be signed or verified, using the specified array of
* bytes, starting at the specified offset.
*
* @param data the array of bytes.
* @param off the offset to start from in the array of bytes.
* @param len the number of bytes to use, starting at offset.
* @throws SignatureException if this signature object is not initialized
* properly.
*/
public final void update(byte[]data, int off, int len)
throws SignatureException
@@ -434,11 +516,10 @@ public abstract class Signature extends SignatureSpi
throw new SignatureException();
}
/**
Gets the name of the algorithm currently used.
The names of algorithms are usually SHA/DSA or SHA/RSA.
@return name of algorithm.
/**
* Returns the name of the algorithm for this signature object.
*
* @return the name of the algorithm for this signature object.
*/
public final String getAlgorithm()
{
@@ -446,9 +527,11 @@ public abstract class Signature extends SignatureSpi
}
/**
Returns a representation of the Signature as a String
@return a string representing the signature
* Returns a string representation of this signature object, providing
* information that includes the state of the object and the name of the
* algorithm used.
*
* @return a string representation of this signature object.
*/
public String toString()
{
@@ -456,16 +539,22 @@ public abstract class Signature extends SignatureSpi
}
/**
Sets the specified algorithm parameter to the specified value.
@param param parameter name
@param value parameter value
@throws InvalidParameterException invalid parameter, parameter
already set and cannot set again, a security exception,
etc.
@deprecated use the other setParameter
* Sets the specified algorithm parameter to the specified value. This method
* supplies a general-purpose mechanism through which it is possible to set
* the various parameters of this object. A parameter may be any settable
* parameter for the algorithm, such as a parameter size, or a source of
* random bits for signature generation (if appropriate), or an indication of
* whether or not to perform a specific but optional computation. A uniform
* algorithm-specific naming scheme for each parameter is desirable but left
* unspecified at this time.
*
* @param param the string identifier of the parameter.
* @param value the parameter value.
* @throws InvalidParameterException if param is an invalid parameter for this
* signature algorithm engine, the parameter is already set and cannot be set
* again, a security exception occurs, and so on.
* @see #getParameter(String)
* @deprecated Use setParameter(AlgorithmParameterSpec).
*/
public final void setParameter(String param, Object value)
throws InvalidParameterException
@@ -474,17 +563,12 @@ public abstract class Signature extends SignatureSpi
}
/**
Sets the signature engine with the specified
AlgorithmParameterSpec;
By default this always throws UnsupportedOperationException
if not overridden;
@param params the parameters
@throws InvalidParameterException invalid parameter, parameter
already set and cannot set again, a security exception,
etc.
* Initializes this signature engine with the specified parameter set.
*
* @param params the parameters.
* @throws InvalidAlgorithmParameterException if the given parameters are
* inappropriate for this signature engine.
* @see #getParameters()
*/
public final void setParameter(AlgorithmParameterSpec params)
throws InvalidAlgorithmParameterException
@@ -493,15 +577,40 @@ public abstract class Signature extends SignatureSpi
}
/**
Gets the value for the specified algorithm parameter.
* <p>Returns the parameters used with this signature object.</p>
*
* <p>The returned parameters may be the same that were used to initialize
* this signature, or may contain a combination of default and randomly
* generated parameter values used by the underlying signature implementation
* if this signature requires algorithm parameters but was not initialized
* with any.
*
* @return the parameters used with this signature, or <code>null</code> if
* this signature does not use any parameters.
* @see #setParameter(AlgorithmParameterSpec)
*/
public final AlgorithmParameters getParameters()
{
return engineGetParameters();
}
@param param parameter name
@return parameter value
@throws InvalidParameterException invalid parameter
@deprecated use the other getParameter
/**
* Gets the value of the specified algorithm parameter. This method supplies
* a general-purpose mechanism through which it is possible to get the various
* parameters of this object. A parameter may be any settable parameter for
* the algorithm, such as a parameter size, or a source of random bits for
* signature generation (if appropriate), or an indication of whether or not
* to perform a specific but optional computation. A uniform
* algorithm-specific naming scheme for each parameter is desirable but left
* unspecified at this time.
*
* @param param the string name of the parameter.
* @return the object that represents the parameter value, or null if there
* is none.
* @throws InvalidParameterException if param is an invalid parameter for this
* engine, or another exception occurs while trying to get this parameter.
* @see #setParameter(String, Object)
* @deprecated
*/
public final Object getParameter(String param)
throws InvalidParameterException
@@ -510,12 +619,11 @@ public abstract class Signature extends SignatureSpi
}
/**
Returns a clone if cloneable.
@return a clone if cloneable.
@throws CloneNotSupportedException if the implementation does
not support cloning
* Returns a clone if the implementation is cloneable.
*
* @return a clone if the implementation is cloneable.
* @throws CloneNotSupportedException if this is called on an implementation
* that does not support {@link Cloneable}.
*/
public Object clone() throws CloneNotSupportedException
{