initializedmessagedigest.html

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<CODE>abstract &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javacard/security/InitializedMessageDigest.html#setInitialDigest(byte[], short, short, byte[], short, short)">setInitialDigest</A></B>(byte[]&nbsp;initialDigestBuf,
                 short&nbsp;initialDigestOffset,
                 short&nbsp;initialDigestLength,
                 byte[]&nbsp;digestedMsgLenBuf,
                 short&nbsp;digestedMsgLenOffset,
                 short&nbsp;digestedMsgLenLength)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This method initializes the starting hash value in place of the default
 value used by the <code>MessageDigest</code> superclass.</TD>
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<TH ALIGN="left"><B>Methods inherited from class javacard.security.<A HREF="../../javacard/security/MessageDigest.html" title="class in javacard.security">MessageDigest</A></B></TH>
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<TD><CODE><A HREF="../../javacard/security/MessageDigest.html#doFinal(byte[], short, short, byte[], short)">doFinal</A>, <A HREF="../../javacard/security/MessageDigest.html#getAlgorithm()">getAlgorithm</A>, <A HREF="../../javacard/security/MessageDigest.html#getInitializedMessageDigestInstance(byte, boolean)">getInitializedMessageDigestInstance</A>, <A HREF="../../javacard/security/MessageDigest.html#getInstance(byte, boolean)">getInstance</A>, <A HREF="../../javacard/security/MessageDigest.html#getLength()">getLength</A>, <A HREF="../../javacard/security/MessageDigest.html#reset()">reset</A>, <A HREF="../../javacard/security/MessageDigest.html#update(byte[], short, short)">update</A></CODE></TD>
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<A NAME="InitializedMessageDigest()"><!-- --></A><H3>
InitializedMessageDigest</H3>
<PRE>
protected <B>InitializedMessageDigest</B>()</PRE>
<DL>
<DD>protected constructor
<P>
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<A NAME="setInitialDigest(byte[], short, short, byte[], short, short)"><!-- --></A><H3>
setInitialDigest</H3>
<PRE>
public abstract void <B>setInitialDigest</B>(byte[]&nbsp;initialDigestBuf,
                                      short&nbsp;initialDigestOffset,
                                      short&nbsp;initialDigestLength,
                                      byte[]&nbsp;digestedMsgLenBuf,
                                      short&nbsp;digestedMsgLenOffset,
                                      short&nbsp;digestedMsgLenLength)
                               throws <A HREF="../../javacard/security/CryptoException.html" title="class in javacard.security">CryptoException</A></PRE>
<DL>
<DD>This method initializes the starting hash value in place of the default
 value used by the <code>MessageDigest</code> superclass. The starting
 hash value represents the previously computed
 hash (using the same algorithm) of the first part of the message. The remaining
 bytes of the message must be presented to this <code>InitializedMessageDigest</code>
 object via the <code>update</code> and <code>doFinal</code> methods to
 generate the final message digest.
 <p>Note:<ul>
 <li><em>The maximum allowed value of the byte length of the first part of the message is
 algorithm specific</em>
 </ul>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>initialDigestBuf</CODE> - input buffer containing the starting hash value representing
 the previously computed hash (using the same algorithm) of first part of the message<DD><CODE>initialDigestOffset</CODE> - offset into <code>initialDigestBuf</code> array where initial digest value
 data begins<DD><CODE>initialDigestLength</CODE> - the length of data in <code>initialDigestBuf</code> array.<DD><CODE>digestedMsgLenBuf</CODE> - the byte array containing the number of bytes in the first part of the message
 that has previously been hashed to obtain the specified initial digest value value<DD><CODE>digestedMsgLenOffset</CODE> - the offset within <CODE>digestedMsgLenBuf</CODE> where the
 digested length begins(the bytes starting at this offset for <CODE>digestedMsgLenLength</CODE> bytes are concatenated
 to form the actual digested message length value)<DD><CODE>digestedMsgLenLength</CODE> - byte length of the digested length
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javacard/security/CryptoException.html" title="class in javacard.security">CryptoException</A></CODE> - with the following reason codes:<ul>
 <li><code>CryptoException.ILLEGAL_VALUE</code> if the parameter 
 <code>initialDigestLength</code> is not equal to the length of message 
 digest of the algorithm (see <CODE>LENGTH_*</CODE> constants <A HREF="../../javacard/security/MessageDigest.html#LENGTH_SHA"><CODE>LENGTH_SHA</CODE></A>) or 
 if the number of bytes in the first part of the message that has previously 
 been hashed is 0 or not a multiple of the algorithm's block size or
 greater than the maximum length supported by the algorithm 
 (see <CODE>ALG_*</CODE> algorithm descriptions <A HREF="../../javacard/security/MessageDigest.html#ALG_SHA"><CODE>ALG_SHA</CODE></A>).</ul></DL>
</DD>
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