keypairgenerator.html

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<A NAME="KeyPairGenerator(java.lang.String)"><!-- --></A><H3>
KeyPairGenerator</H3>
<PRE>
protected <B>KeyPairGenerator</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;algorithm)</PRE>
<DL>
<DD>Creates a KeyPairGenerator object for the specified algorithm.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>algorithm</CODE> - the standard string name of the algorithm. 
 See Appendix A in the <a href=
 "../../../guide/security/CryptoSpec.html#AppA">
 Java Cryptography Architecture API Specification &amp; Reference </a> 
 for information about standard algorithm names.</DL>
</DD>
</DL>

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<A NAME="getAlgorithm()"><!-- --></A><H3>
getAlgorithm</H3>
<PRE>
public <A HREF="../../java/lang/String.html">String</A> <B>getAlgorithm</B>()</PRE>
<DL>
<DD>Returns the standard name of the algorithm for this key pair generator.
 See Appendix A in the <a href=
 "../../../guide/security/CryptoSpec.html#AppA">
 Java Cryptography Architecture API Specification &amp; Reference </a> 
 for information about standard algorithm names.<DD><DL>
<DT><B>Returns:</B><DD>the standard string name of the algorithm.</DL>
</DD>
</DL>
<HR>

<A NAME="getInstance(java.lang.String)"><!-- --></A><H3>
getInstance</H3>
<PRE>
public static <A HREF="../../java/security/KeyPairGenerator.html">KeyPairGenerator</A> <B>getInstance</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;algorithm)
                                    throws <A HREF="../../java/security/NoSuchAlgorithmException.html">NoSuchAlgorithmException</A></PRE>
<DL>
<DD>Generates a KeyPairGenerator object that implements the specified digest
 algorithm. If the default provider package
 provides an implementation of the requested digest algorithm,
 an instance of KeyPairGenerator containing that implementation is
 returned.
 If the algorithm is not available in the default 
 package, other packages are searched.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>algorithm</CODE> - the standard string name of the algorithm. 
 See Appendix A in the <a href=
 "../../../guide/security/CryptoSpec.html#AppA">
 Java Cryptography Architecture API Specification &amp; Reference </a> 
 for information about standard algorithm names.<DT><B>Returns:</B><DD>the new KeyPairGenerator object.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/NoSuchAlgorithmException.html">NoSuchAlgorithmException</A></CODE> - if the algorithm is
 not available in the environment.</DL>
</DD>
</DL>
<HR>

<A NAME="getInstance(java.lang.String, java.lang.String)"><!-- --></A><H3>
getInstance</H3>
<PRE>
public static <A HREF="../../java/security/KeyPairGenerator.html">KeyPairGenerator</A> <B>getInstance</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;algorithm,
                                           <A HREF="../../java/lang/String.html">String</A>&nbsp;provider)
                                    throws <A HREF="../../java/security/NoSuchAlgorithmException.html">NoSuchAlgorithmException</A>,
                                           <A HREF="../../java/security/NoSuchProviderException.html">NoSuchProviderException</A></PRE>
<DL>
<DD>Generates a KeyPairGenerator object implementing the specified
 algorithm, as supplied from the specified provider, 
 if such an algorithm is available from the provider.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>algorithm</CODE> - the standard string name of the algorithm.
 See Appendix A in the <a href=
 "../../../guide/security/CryptoSpec.html#AppA">
 Java Cryptography Architecture API Specification &amp; Reference </a> 
 for information about standard algorithm names.<DD><CODE>provider</CODE> - the string name of the provider.<DT><B>Returns:</B><DD>the new KeyPairGenerator object.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/NoSuchAlgorithmException.html">NoSuchAlgorithmException</A></CODE> - if the algorithm is
 not available from the provider.<DD><CODE><A HREF="../../java/security/NoSuchProviderException.html">NoSuchProviderException</A></CODE> - if the provider is not
 available in the environment.<DT><B>See Also: </B><DD><A HREF="../../java/security/Provider.html"><CODE>Provider</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getProvider()"><!-- --></A><H3>
getProvider</H3>
<PRE>
public final <A HREF="../../java/security/Provider.html">Provider</A> <B>getProvider</B>()</PRE>
<DL>
<DD>Returns the provider of this key pair generator object.<DD><DL>
<DT><B>Returns:</B><DD>the provider of this key pair generator object</DL>
</DD>
</DL>
<HR>

<A NAME="initialize(int)"><!-- --></A><H3>
initialize</H3>
<PRE>
public void <B>initialize</B>(int&nbsp;keysize)</PRE>
<DL>
<DD>Initializes the key pair generator for a certain keysize using
 a default parameter set and the <code>SecureRandom</code>
 implementation of the highest-priority installed provider as the source
 of randomness.
 (If none of the installed providers supply an implementation of
 <code>SecureRandom</code>, a system-provided source of randomness is
 used.)<DD><DL>
<DT><B>Parameters:</B><DD><CODE>keysize</CODE> - the keysize. This is an
 algorithm-specific metric, such as modulus length, specified in
 number of bits.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidParameterException.html">InvalidParameterException</A></CODE> - if the <code>keysize</code> is not
 supported by this KeyPairGenerator object.</DL>
</DD>
</DL>
<HR>

<A NAME="initialize(int, java.security.SecureRandom)"><!-- --></A><H3>
initialize</H3>
<PRE>
public void <B>initialize</B>(int&nbsp;keysize,
                       <A HREF="../../java/security/SecureRandom.html">SecureRandom</A>&nbsp;random)</PRE>
<DL>
<DD>Initializes the key pair generator for a certain keysize with
 the given source of randomness (and a default parameter set).<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/security/KeyPairGeneratorSpi.html#initialize(int, java.security.SecureRandom)">initialize</A></CODE> in class <CODE><A HREF="../../java/security/KeyPairGeneratorSpi.html">KeyPairGeneratorSpi</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>keysize</CODE> - the keysize. This is an
 algorithm-specific metric, such as modulus length, specified in
 number of bits.<DD><CODE>random</CODE> - the source of randomness.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidParameterException.html">InvalidParameterException</A></CODE> - if the <code>keysize</code> is not
 supported by this KeyPairGenerator object.<DT><B>Since: </B><DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="initialize(java.security.spec.AlgorithmParameterSpec)"><!-- --></A><H3>
initialize</H3>
<PRE>
public void <B>initialize</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 the key pair generator using the specified parameter 
 set and the <code>SecureRandom</code>
 implementation of the highest-priority installed provider as the source
 of randomness.
 (If none of the installed providers supply an implementation of
 <code>SecureRandom</code>, a system-provided source of randomness is
 used.).

 <p>This concrete method has been added to this previously-defined
 abstract class.
 This method calls the KeyPairGeneratorSpi 
 <CODE>initialize(java.security.spec.AlgorithmParameterSpec,
 java.security.SecureRandom) initialize</CODE> method, 
 passing it <code>params</code> and a source of randomness (obtained
 from the highest-priority installed provider or system-provided if none
 of the installed providers supply one).
 That <code>initialize</code> method always throws an
 UnsupportedOperationException if it is not overridden by the provider.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>params</CODE> - the parameter set used to generate the keys.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidAlgorithmParameterException.html">InvalidAlgorithmParameterException</A></CODE> - if the given parameters
 are inappropriate for this key pair generator.<DT><B>Since: </B><DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="initialize(java.security.spec.AlgorithmParameterSpec, java.security.SecureRandom)"><!-- --></A><H3>
initialize</H3>
<PRE>
public void <B>initialize</B>(<A HREF="../../java/security/spec/AlgorithmParameterSpec.html">AlgorithmParameterSpec</A>&nbsp;params,
                       <A HREF="../../java/security/SecureRandom.html">SecureRandom</A>&nbsp;random)
                throws <A HREF="../../java/security/InvalidAlgorithmParameterException.html">InvalidAlgorithmParameterException</A></PRE>
<DL>
<DD>Initializes the key pair generator with the given parameter 
 set and source of randomness.

 <p>This concrete method has been added to this previously-defined
 abstract class.
 This method calls the KeyPairGeneratorSpi <CODE>initialize(java.security.spec.AlgorithmParameterSpec,
 java.security.SecureRandom) initialize</CODE> method, 
 passing it <code>params</code> and <code>random</code>.
 That <code>initialize</code>
 method always throws an
 UnsupportedOperationException if it is not overridden by the provider.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/security/KeyPairGeneratorSpi.html#initialize(java.security.spec.AlgorithmParameterSpec, java.security.SecureRandom)">initialize</A></CODE> in class <CODE><A HREF="../../java/security/KeyPairGeneratorSpi.html">KeyPairGeneratorSpi</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>params</CODE> - the parameter set used to generate the keys.<DD><CODE>random</CODE> - the source of randomness.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/security/InvalidAlgorithmParameterException.html">InvalidAlgorithmParameterException</A></CODE> - if the given parameters
 are inappropriate for this key pair generator.<DT><B>Since: </B><DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="genKeyPair()"><!-- --></A><H3>
genKeyPair</H3>
<PRE>
public final <A HREF="../../java/security/KeyPair.html">KeyPair</A> <B>genKeyPair</B>()</PRE>
<DL>
<DD>Generates a key pair.

 <p>If this KeyPairGenerator has not been initialized explicitly,
 provider-specific defaults will be used for the size and other
 (algorithm-specific) values of the generated keys.

 <p>This will generate a new key pair every time it is called.

 <p>This method is functionally equivalent to 
 <A HREF="../../java/security/KeyPairGenerator.html#generateKeyPair()"><CODE>generateKeyPair</CODE></A>.<DD><DL>
<DT><B>Returns:</B><DD>the generated key pair<DT><B>Since: </B><DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="generateKeyPair()"><!-- --></A><H3>
generateKeyPair</H3>
<PRE>
public <A HREF="../../java/security/KeyPair.html">KeyPair</A> <B>generateKeyPair</B>()</PRE>
<DL>
<DD>Generates a key pair.

 <p>If this KeyPairGenerator has not been initialized explicitly,
 provider-specific defaults will be used for the size and other
 (algorithm-specific) values of the generated keys.

 <p>This will generate a new key pair every time it is called.
 
 <p>This method is functionally equivalent to 
 <A HREF="../../java/security/KeyPairGenerator.html#genKeyPair()"><CODE>genKeyPair</CODE></A>.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/security/KeyPairGeneratorSpi.html#generateKeyPair()">generateKeyPair</A></CODE> in class <CODE><A HREF="../../java/security/KeyPairGeneratorSpi.html">KeyPairGeneratorSpi</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the generated key pair</DL>
</DD>
</DL>
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