initializedmessagedigest.html
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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_02) on Wed Mar 22 19:19:09 PST 2006 --><TITLE>InitializedMessageDigest (Java Card API and Subsets)</TITLE><META NAME="keywords" CONTENT="javacard.security.InitializedMessageDigest class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="InitializedMessageDigest (Java Card API and Subsets)";}</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"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <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/InitializedMessageDigest.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-all.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 Card </b><br><font size="-1">v2.2.2</font></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../javacard/security/HMACKey.html" title="interface in javacard.security"><B>PREV CLASS</B></A> <A HREF="../../javacard/security/Key.html" title="interface in javacard.security"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javacard/security/InitializedMessageDigest.html" target="_top"><B>FRAMES</B></A> <A HREF="InitializedMessageDigest.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 | <A HREF="#fields_inherited_from_class_javacard.security.MessageDigest">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <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">javacard.security</FONT><BR>Class InitializedMessageDigest</H2><PRE><A HREF="../../java/lang/Object.html" title="class in java.lang">java.lang.Object</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><A HREF="../../javacard/security/MessageDigest.html" title="class in javacard.security">javacard.security.MessageDigest</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>javacard.security.InitializedMessageDigest</B></PRE><HR><DL><DT><PRE>public abstract class <B>InitializedMessageDigest</B><DT>extends <A HREF="../../javacard/security/MessageDigest.html" title="class in javacard.security">MessageDigest</A></DL></PRE><P>The <code>InitializedMessageDigest</code> class is a subclass of the base class <code>MessageDigest</code>. This class is used to generate a hash representing a specified message but with the additional capability to initialize the starting hash value corresponding to a previously hashed part of the message. Implementations of <code>InitializedMessageDigest</code> algorithms must extend this class and implement all the abstract methods. <p> A tear or card reset event resets a <code>InitializedMessageDigest</code> object to the initial state (state upon construction). <p> Even if a transaction is in progress, update of intermediate result state in the implementation instance shall not participate in the transaction.<P><P><DL><DT><B>Since:</B></DT> <DD>2.2.2</DD></DL><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_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>Field Summary</B></FONT></TH></TR></TABLE> <A NAME="fields_inherited_from_class_javacard.security.MessageDigest"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Fields inherited from class javacard.security.<A HREF="../../javacard/security/MessageDigest.html" title="class in javacard.security">MessageDigest</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../javacard/security/MessageDigest.html#ALG_MD5">ALG_MD5</A>, <A HREF="../../javacard/security/MessageDigest.html#ALG_RIPEMD160">ALG_RIPEMD160</A>, <A HREF="../../javacard/security/MessageDigest.html#ALG_SHA">ALG_SHA</A>, <A HREF="../../javacard/security/MessageDigest.html#ALG_SHA_256">ALG_SHA_256</A>, <A HREF="../../javacard/security/MessageDigest.html#ALG_SHA_384">ALG_SHA_384</A>, <A HREF="../../javacard/security/MessageDigest.html#ALG_SHA_512">ALG_SHA_512</A>, <A HREF="../../javacard/security/MessageDigest.html#LENGTH_MD5">LENGTH_MD5</A>, <A HREF="../../javacard/security/MessageDigest.html#LENGTH_RIPEMD160">LENGTH_RIPEMD160</A>, <A HREF="../../javacard/security/MessageDigest.html#LENGTH_SHA">LENGTH_SHA</A>, <A HREF="../../javacard/security/MessageDigest.html#LENGTH_SHA_256">LENGTH_SHA_256</A>, <A HREF="../../javacard/security/MessageDigest.html#LENGTH_SHA_384">LENGTH_SHA_384</A>, <A HREF="../../javacard/security/MessageDigest.html#LENGTH_SHA_512">LENGTH_SHA_512</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_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>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected </CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/security/InitializedMessageDigest.html#InitializedMessageDigest()">InitializedMessageDigest</A></B>()</CODE><BR> protected constructor</TD></TR></TABLE> <!-- ========== 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">⌨️ 快捷键说明
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