signaturespi.html

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<A NAME="engineInitVerify(java.security.PublicKey)"><!-- --></A><H3>
engineInitVerify</H3>
<PRE>
protected abstract void <B>engineInitVerify</B>(<A HREF="../../java/security/PublicKey.html">PublicKey</A>&nbsp;publicKey)
                                  throws <A HREF="../../java/security/InvalidKeyException.html">InvalidKeyException</A></PRE>
<DL>
<DD>Initializes this signature object with the specified
 public key for verification operations.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>publicKey</CODE> - the public key of the identity whose signature is
 going to be verified.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidKeyException.html">InvalidKeyException</A></CODE> - if the key is improperly
 encoded, parameters are missing, and so on.</DL>
</DD>
</DL>
<HR>

<A NAME="engineInitSign(java.security.PrivateKey)"><!-- --></A><H3>
engineInitSign</H3>
<PRE>
protected abstract void <B>engineInitSign</B>(<A HREF="../../java/security/PrivateKey.html">PrivateKey</A>&nbsp;privateKey)
                                throws <A HREF="../../java/security/InvalidKeyException.html">InvalidKeyException</A></PRE>
<DL>
<DD>Initializes this signature object with the specified
 private key for signing operations.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>privateKey</CODE> - the private key of the identity whose signature
 will be generated.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidKeyException.html">InvalidKeyException</A></CODE> - if the key is improperly
 encoded, parameters are missing, and so on.</DL>
</DD>
</DL>
<HR>

<A NAME="engineInitSign(java.security.PrivateKey, java.security.SecureRandom)"><!-- --></A><H3>
engineInitSign</H3>
<PRE>
protected void <B>engineInitSign</B>(<A HREF="../../java/security/PrivateKey.html">PrivateKey</A>&nbsp;privateKey,
                              <A HREF="../../java/security/SecureRandom.html">SecureRandom</A>&nbsp;random)
                       throws <A HREF="../../java/security/InvalidKeyException.html">InvalidKeyException</A></PRE>
<DL>
<DD>Initializes this signature object with the specified
 private key and source of randomness for signing operations.

 <p>This concrete method has been added to this previously-defined
 abstract class. (For backwards compatibility, it cannot be abstract.)<DD><DL>
<DT><B>Parameters:</B><DD><CODE>privateKey</CODE> - the private key of the identity whose signature
 will be generated.<DD><CODE>random</CODE> - the source of randomness<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidKeyException.html">InvalidKeyException</A></CODE> - if the key is improperly
 encoded, parameters are missing, and so on.</DL>
</DD>
</DL>
<HR>

<A NAME="engineUpdate(byte)"><!-- --></A><H3>
engineUpdate</H3>
<PRE>
protected abstract void <B>engineUpdate</B>(byte&nbsp;b)
                              throws <A HREF="../../java/security/SignatureException.html">SignatureException</A></PRE>
<DL>
<DD>Updates the data to be signed or verified
 using the specified byte.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the byte to use for the update.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/SignatureException.html">SignatureException</A></CODE> - if the engine is not initialized
 properly.</DL>
</DD>
</DL>
<HR>

<A NAME="engineUpdate(byte[], int, int)"><!-- --></A><H3>
engineUpdate</H3>
<PRE>
protected abstract void <B>engineUpdate</B>(byte[]&nbsp;b,
                                     int&nbsp;off,
                                     int&nbsp;len)
                              throws <A HREF="../../java/security/SignatureException.html">SignatureException</A></PRE>
<DL>
<DD>Updates the data to be signed or verified, using the 
 specified array of bytes, starting at the specified offset.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - the array of bytes.<DD><CODE>off</CODE> - the offset to start from in the array of bytes.<DD><CODE>len</CODE> - the number of bytes to use, starting at offset.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/SignatureException.html">SignatureException</A></CODE> - if the engine is not initialized 
 properly.</DL>
</DD>
</DL>
<HR>

<A NAME="engineSign()"><!-- --></A><H3>
engineSign</H3>
<PRE>
protected abstract byte[] <B>engineSign</B>()
                              throws <A HREF="../../java/security/SignatureException.html">SignatureException</A></PRE>
<DL>
<DD>Returns the signature bytes of all the data
 updated so far.    
 The format of the signature depends on the underlying 
 signature scheme.<DD><DL>
<DT><B>Returns:</B><DD>the signature bytes of the signing operation's result.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/SignatureException.html">SignatureException</A></CODE> - if the engine is not
 initialized properly.</DL>
</DD>
</DL>
<HR>

<A NAME="engineSign(byte[], int, int)"><!-- --></A><H3>
engineSign</H3>
<PRE>
protected int <B>engineSign</B>(byte[]&nbsp;outbuf,
                         int&nbsp;offset,
                         int&nbsp;len)
                  throws <A HREF="../../java/security/SignatureException.html">SignatureException</A></PRE>
<DL>
<DD>Finishes this 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>The signature implementation is reset to its initial state
 (the state it was in after a call to one of the
 <code>engineInitSign</code> methods)
 and can be reused to generate further signatures with the same private
 key.

 This method should be abstract, but we leave it concrete for
 binary compatibility.  Knowledgeable providers should override this
 method.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>outbuf</CODE> - buffer for the signature result.<DD><CODE>offset</CODE> - offset into <code>outbuf</code> where the signature is
 stored.<DD><CODE>len</CODE> - number of bytes within <code>outbuf</code> allotted for the
 signature.
 Both this default implementation and the SUN provider do not
 return partial digests. If the value of this parameter is less
 than the actual signature length, this method will throw a
 SignatureException.
 This parameter is ignored if its value is greater than or equal to
 the actual signature length.<DT><B>Returns:</B><DD>the number of bytes placed into <code>outbuf</code><DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/SignatureException.html">SignatureException</A></CODE> - if an error occurs or <code>len</code>
 is less than the actual signature length.<DT><B>Since: </B><DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="engineVerify(byte[])"><!-- --></A><H3>
engineVerify</H3>
<PRE>
protected abstract boolean <B>engineVerify</B>(byte[]&nbsp;sigBytes)
                                 throws <A HREF="../../java/security/SignatureException.html">SignatureException</A></PRE>
<DL>
<DD>Verifies the passed-in signature.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>sigBytes</CODE> - the signature bytes to be verified.<DT><B>Returns:</B><DD>true if the signature was verified, false if not.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/SignatureException.html">SignatureException</A></CODE> - if the engine is not initialized 
 properly, or the passed-in signature is improperly encoded or 
 of the wrong type, etc.</DL>
</DD>
</DL>
<HR>

<A NAME="engineSetParameter(java.lang.String, java.lang.Object)"><!-- --></A><H3>
engineSetParameter</H3>
<PRE>
protected abstract void <B>engineSetParameter</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;param,
                                           <A HREF="../../java/lang/Object.html">Object</A>&nbsp;value)
                                    throws <A HREF="../../java/security/InvalidParameterException.html">InvalidParameterException</A></PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>Replaced by <A HREF="../../java/security/SignatureSpi.html#engineSetParameter(java.security.spec.AlgorithmParameterSpec)"><CODE>engineSetParameter</CODE></A>.</I>
<P>
<DD>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.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>param</CODE> - the string identifier of the parameter.<DD><CODE>value</CODE> - the parameter value.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidParameterException.html">InvalidParameterException</A></CODE> - if <code>param</code> 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.</DL>
</DD>
</DL>
<HR>

<A NAME="engineSetParameter(java.security.spec.AlgorithmParameterSpec)"><!-- --></A><H3>
engineSetParameter</H3>
<PRE>
protected void <B>engineSetParameter</B>(<A HREF="../../java/security/spec/AlgorithmParameterSpec.html">AlgorithmParameterSpec</A>&nbsp;params)
                           throws <A HREF="../../java/security/InvalidAlgorithmParameterException.html">InvalidAlgorithmParameterException</A></PRE>
<DL>
<DD>Initializes this signature engine with the specified parameter set.

 This concrete method has been added to this previously-defined
 abstract class. (For backwards compatibility, it cannot be abstract.)
 It may be overridden by a provider to set the algorithm parameters
 using the specified <code>params</code>. Such an override
 is expected to throw an InvalidAlgorithmParameterException if
 a parameter is invalid.
 If this method is not overridden, it always throws an
 UnsupportedOperationException.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>params</CODE> - the parameters<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidAlgorithmParameterException.html">InvalidAlgorithmParameterException</A></CODE> - if the given parameters
 are inappropriate for this signature engine</DL>
</DD>
</DL>
<HR>

<A NAME="engineGetParameter(java.lang.String)"><!-- --></A><H3>
engineGetParameter</H3>
<PRE>
protected abstract <A HREF="../../java/lang/Object.html">Object</A> <B>engineGetParameter</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;param)
                                      throws <A HREF="../../java/security/InvalidParameterException.html">InvalidParameterException</A></PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I></I>&nbsp;
<P>
<DD>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.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>param</CODE> - the string name of the parameter.<DT><B>Returns:</B><DD>the object that represents the parameter value, or null if
 there is none.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidParameterException.html">InvalidParameterException</A></CODE> - if <code>param</code> is an 
 invalid parameter for this engine, or another exception occurs while
 trying to get this parameter.</DL>
</DD>
</DL>
<HR>

<A NAME="clone()"><!-- --></A><H3>
clone</H3>
<PRE>
public <A HREF="../../java/lang/Object.html">Object</A> <B>clone</B>()
             throws <A HREF="../../java/lang/CloneNotSupportedException.html">CloneNotSupportedException</A></PRE>
<DL>
<DD>Returns a clone if the implementation is cloneable.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Object.html#clone()">clone</A></CODE> in class <CODE><A HREF="../../java/lang/Object.html">Object</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a clone if the implementation is cloneable.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/CloneNotSupportedException.html">CloneNotSupportedException</A></CODE> - if this is called
 on an implementation that does not support <code>Cloneable</code>.</DL>
</DD>
</DL>
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