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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:35:53 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Interface Key</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Key.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/security/Guard.html"><B>PREV CLASS</B></A> <A HREF="../../java/security/Principal.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="Key.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#field_summary">FIELD</A> | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.security</FONT><BR>Interface Key</H2><DL><DT><B>All Superinterfaces:</B> <DD><A HREF="../../java/io/Serializable.html">Serializable</A></DD></DL><DL><DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../java/security/interfaces/DSAPrivateKey.html">DSAPrivateKey</A>, <A HREF="../../java/security/interfaces/DSAPublicKey.html">DSAPublicKey</A>, <A HREF="../../java/security/PrivateKey.html">PrivateKey</A>, <A HREF="../../java/security/PublicKey.html">PublicKey</A>, <A HREF="../../java/security/interfaces/RSAPrivateCrtKey.html">RSAPrivateCrtKey</A>, <A HREF="../../java/security/interfaces/RSAPrivateKey.html">RSAPrivateKey</A>, <A HREF="../../java/security/interfaces/RSAPublicKey.html">RSAPublicKey</A></DD></DL><HR><DL><DT>public interface <B>Key</B><DT>extends <A HREF="../../java/io/Serializable.html">Serializable</A></DL><P>The Key interface is the top-level interface for all keys. It defines the functionality shared by all key objects. All keys have three characteristics: <UL> <LI>An Algorithm <P>This is the key algorithm for that key. The key algorithm is usually an encryption or asymmetric operation algorithm (such as DSA or RSA), which will work with those algorithms and with related algorithms (such as MD5 with RSA, SHA-1 with RSA, Raw DSA, etc.) The name of the algorithm of a key is obtained using the <A HREF="../../java/security/Key.html#getAlgorithm()"><CODE>getAlgorithm</CODE></A> method.<P> <LI>An Encoded Form <P>This is an external encoded form for the key used when a standard representation of the key is needed outside the Java Virtual Machine, as when transmitting the key to some other party. The key is encoded according to a standard format (such as X.509 or PKCS#8), and is returned using the <A HREF="../../java/security/Key.html#getEncoded()"><CODE>getEncoded</CODE></A> method.<P> <LI>A Format <P>This is the name of the format of the encoded key. It is returned by the <A HREF="../../java/security/Key.html#getFormat()"><CODE>getFormat</CODE></A> method.<P> </UL> Keys are generally obtained through key generators, certificates, or various Identity classes used to manage keys. Keys may also be obtained from key specifications (transparent representations of the underlying key material) through the use of a key factory (see <A HREF="../../java/security/KeyFactory.html"><CODE>KeyFactory</CODE></A>).<P><DL><DT><B>See Also: </B><DD><A HREF="../../java/security/PublicKey.html"><CODE>PublicKey</CODE></A>, <A HREF="../../java/security/PrivateKey.html"><CODE>PrivateKey</CODE></A>, <A HREF="../../java/security/KeyPair.html"><CODE>KeyPair</CODE></A>, <A HREF="../../java/security/KeyPairGenerator.html"><CODE>KeyPairGenerator</CODE></A>, <A HREF="../../java/security/KeyFactory.html"><CODE>KeyFactory</CODE></A>, <A HREF="../../java/security/spec/KeySpec.html"><CODE>KeySpec</CODE></A>, <A HREF="../../java/security/Identity.html"><CODE>Identity</CODE></A>, <A HREF="../../java/security/Signer.html"><CODE>Signer</CODE></A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static long</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/security/Key.html#serialVersionUID">serialVersionUID</A></B></CODE><BR> The class fingerprint that is set to indicate serialization compatibility with a previous version of the class.</TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/security/Key.html#getAlgorithm()">getAlgorithm</A></B>()</CODE><BR> Returns the standard algorithm name for this key.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> byte[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/security/Key.html#getEncoded()">getEncoded</A></B>()</CODE><BR> Returns the key in its primary encoding format, or null if this key does not support encoding.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/security/Key.html#getFormat()">getFormat</A></B>()</CODE><BR> Returns the name of the primary encoding format of this key, or null if this key does not support encoding.</TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><A NAME="field_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Field Detail</B></FONT></TD></TR></TABLE><A NAME="serialVersionUID"><!-- --></A><H3>serialVersionUID</H3><PRE>public static final long <B>serialVersionUID</B></PRE><DL><DD>The class fingerprint that is set to indicate serialization compatibility with a previous version of the class.</DL><!-- ========= CONSTRUCTOR DETAIL ======== --><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><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 algorithm name for this key. For example, "DSA" would indicate that this key is a DSA key. See Appendix A in the <a href= "../../../guide/security/CryptoSpec.html#AppA"> Java Cryptography Architecture API Specification & Reference </a> for information about standard algorithm names.<DD><DL></DL></DD><DD><DL><DT><B>Returns:</B><DD>the name of the algorithm associated with this key.</DL></DD></DL><HR><A NAME="getFormat()"><!-- --></A><H3>getFormat</H3><PRE>public <A HREF="../../java/lang/String.html">String</A> <B>getFormat</B>()</PRE><DL><DD>Returns the name of the primary encoding format of this key, or null if this key does not support encoding. The primary encoding format is named in terms of the appropriate ASN.1 data format, if an ASN.1 specification for this key exists. For example, the name of the ASN.1 data format for public keys is <I>SubjectPublicKeyInfo</I>, as defined by the X.509 standard; in this case, the returned format is <code>"X.509"</code>. Similarly, the name of the ASN.1 data format for private keys is <I>PrivateKeyInfo</I>, as defined by the PKCS #8 standard; in this case, the returned format is <code>"PKCS#8"</code>.<DD><DL></DL></DD><DD><DL><DT><B>Returns:</B><DD>the primary encoding format of the key.</DL></DD></DL><HR><A NAME="getEncoded()"><!-- --></A><H3>getEncoded</H3><PRE>public byte[] <B>getEncoded</B>()</PRE><DL><DD>Returns the key in its primary encoding format, or null if this key does not support encoding.<DD><DL></DL></DD><DD><DL><DT><B>Returns:</B><DD>the encoded key, or null if the key does not support encoding.</DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Key.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. 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