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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_08) on Wed Nov 07 10:29:38 EST 2007 --><TITLE>DerivationFunction (Bouncy Castle Library 1.38 API Specification)</TITLE><META NAME="keywords" CONTENT="org.bouncycastle.crypto.DerivationFunction interface"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="DerivationFunction (Bouncy Castle Library 1.38 API Specification)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- 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CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Bouncy Castle Cryptography Library 1.38</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto"><B>PREV CLASS</B></A> <A HREF="../../../org/bouncycastle/crypto/DerivationParameters.html" title="interface in org.bouncycastle.crypto"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html?org/bouncycastle/crypto/DerivationFunction.html" target="_top"><B>FRAMES</B></A> <A HREF="DerivationFunction.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.bouncycastle.crypto</FONT><BR>Interface DerivationFunction</H2><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../org/bouncycastle/crypto/generators/BaseKDFBytesGenerator.html" title="class in org.bouncycastle.crypto.generators">BaseKDFBytesGenerator</A>, <A HREF="../../../org/bouncycastle/jce/provider/BrokenKDF2BytesGenerator.html" title="class in org.bouncycastle.jce.provider">BrokenKDF2BytesGenerator</A>, <A HREF="../../../org/bouncycastle/crypto/agreement/kdf/DHKEKGenerator.html" title="class in org.bouncycastle.crypto.agreement.kdf">DHKEKGenerator</A>, <A HREF="../../../org/bouncycastle/crypto/agreement/kdf/ECDHKEKGenerator.html" title="class in org.bouncycastle.crypto.agreement.kdf">ECDHKEKGenerator</A>, <A HREF="../../../org/bouncycastle/crypto/generators/KDF1BytesGenerator.html" title="class in org.bouncycastle.crypto.generators">KDF1BytesGenerator</A>, <A HREF="../../../org/bouncycastle/crypto/generators/KDF2BytesGenerator.html" title="class in org.bouncycastle.crypto.generators">KDF2BytesGenerator</A>, <A HREF="../../../org/bouncycastle/crypto/generators/MGF1BytesGenerator.html" title="class in org.bouncycastle.crypto.generators">MGF1BytesGenerator</A></DD></DL><HR><DL><DT><PRE>public interface <B>DerivationFunction</B></DL></PRE><P>base interface for general purpose byte derivation functions.<P><P><HR><P><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/bouncycastle/crypto/DerivationFunction.html#generateBytes(byte[], int, int)">generateBytes</A></B>(byte[] out, int outOff, int len)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../org/bouncycastle/crypto/Digest.html" title="interface in org.bouncycastle.crypto">Digest</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/bouncycastle/crypto/DerivationFunction.html#getDigest()">getDigest</A></B>()</CODE><BR> return the message digest used as the basis for the function</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/bouncycastle/crypto/DerivationFunction.html#init(org.bouncycastle.crypto.DerivationParameters)">init</A></B>(<A HREF="../../../org/bouncycastle/crypto/DerivationParameters.html" title="interface in org.bouncycastle.crypto">DerivationParameters</A> param)</CODE><BR> </TD></TR></TABLE> <P><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Method Detail</B></FONT></TH></TR></TABLE><A NAME="init(org.bouncycastle.crypto.DerivationParameters)"><!-- --></A><H3>init</H3><PRE>void <B>init</B>(<A HREF="../../../org/bouncycastle/crypto/DerivationParameters.html" title="interface in org.bouncycastle.crypto">DerivationParameters</A> param)</PRE><DL><DD><DL></DL></DD></DL><HR><A NAME="getDigest()"><!-- --></A><H3>getDigest</H3><PRE><A HREF="../../../org/bouncycastle/crypto/Digest.html" title="interface in org.bouncycastle.crypto">Digest</A> <B>getDigest</B>()</PRE><DL><DD>return the message digest used as the basis for the function<P><DD><DL></DL></DD></DL><HR><A NAME="generateBytes(byte[], int, int)"><!-- --></A><H3>generateBytes</H3><PRE>int <B>generateBytes</B>(byte[] out, int outOff, int len) throws <A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A>, java.lang.IllegalArgumentException</PRE><DL><DD><DL><DT><B>Throws:</B><DD><CODE><A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A></CODE><DD><CODE>java.lang.IllegalArgumentException</CODE></DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ======= START OF BOTTOM NAVBAR ====== --><A NAME="navbar_bottom"><!-- --></A><A HREF="#skip-navbar_bottom" title="Skip navigation links"></A><TABLE 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