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<div class="subTitle">edu.rit.crypto</div>
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<h2 title="Class SHA256" class="title">Class SHA256</h2>
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<pre>public class <span class="strong">SHA256</span>
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extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
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implements <a href="../../../edu/rit/crypto/HashFunction.html" title="interface in edu.rit.crypto">HashFunction</a></pre>
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<div class="block">Class SHA256 provides an object that computes the SHA-256 cryptographic hash
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function.</div>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../edu/rit/crypto/SHA256.html#SHA256()">SHA256</a></strong>()</code>
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<div class="block">Construct a new SHA-256 hash function.</div>
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/crypto/SHA256.html#digest(byte[])">digest</a></strong>(byte[] digest)</code>
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<div class="block">Obtain the message digest.</div>
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</td>
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/crypto/SHA256.html#digestSize()">digestSize</a></strong>()</code>
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<div class="block">Returns this hash function's digest size in bytes.</div>
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</td>
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<tr class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/crypto/SHA256.html#hash(byte[])">hash</a></strong>(byte[] buf)</code>
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<div class="block">Append the given byte array to the message being hashed.</div>
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</td>
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<tr class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/crypto/SHA256.html#hash(byte[], int, int)">hash</a></strong>(byte[] buf,
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int off,
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int len)</code>
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<div class="block">Append a portion of the given byte array to the message being hashed.</div>
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</td>
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<tr class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/crypto/SHA256.html#hash(int)">hash</a></strong>(int b)</code>
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<div class="block">Append the given byte to the message being hashed.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/crypto/SHA256.html#reset()">reset</a></strong>()</code>
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<div class="block">Reset this hash function.</div>
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<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
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<a name="SHA256()">
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<h4>SHA256</h4>
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<pre>public SHA256()</pre>
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<div class="block">Construct a new SHA-256 hash function.</div>
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</li>
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</ul>
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<h4>digestSize</h4>
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<pre>public int digestSize()</pre>
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<div class="block">Returns this hash function's digest size in bytes.</div>
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<dl>
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<dt><strong>Specified by:</strong></dt>
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<dd><code><a href="../../../edu/rit/crypto/HashFunction.html#digestSize()">digestSize</a></code> in interface <code><a href="../../../edu/rit/crypto/HashFunction.html" title="interface in edu.rit.crypto">HashFunction</a></code></dd>
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<dt><span class="strong">Returns:</span></dt><dd>Digest size.</dd></dl>
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</li>
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</ul>
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<h4>hash</h4>
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<pre>public void hash(int b)</pre>
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<div class="block">Append the given byte to the message being hashed. Only the least
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significant 8 bits of <TT>b</TT> are used.</div>
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<dl>
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<dt><strong>Specified by:</strong></dt>
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<dd><code><a href="../../../edu/rit/crypto/HashFunction.html#hash(int)">hash</a></code> in interface <code><a href="../../../edu/rit/crypto/HashFunction.html" title="interface in edu.rit.crypto">HashFunction</a></code></dd>
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<dt><span class="strong">Parameters:</span></dt><dd><code>b</code> - Message byte.</dd></dl>
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<h4>hash</h4>
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<pre>public void hash(byte[] buf)</pre>
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<div class="block">Append the given byte array to the message being hashed.</div>
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<dl>
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<dt><strong>Specified by:</strong></dt>
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<dd><code><a href="../../../edu/rit/crypto/HashFunction.html#hash(byte[])">hash</a></code> in interface <code><a href="../../../edu/rit/crypto/HashFunction.html" title="interface in edu.rit.crypto">HashFunction</a></code></dd>
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<dt><span class="strong">Parameters:</span></dt><dd><code>buf</code> - Array of message bytes.</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - (unchecked exception) Thrown if <TT>buf</TT> is null.</dd></dl>
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</ul>
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<a name="hash(byte[], int, int)">
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<h4>hash</h4>
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<pre>public void hash(byte[] buf,
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int off,
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int len)</pre>
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<div class="block">Append a portion of the given byte array to the message being hashed.</div>
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<dl>
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<dt><strong>Specified by:</strong></dt>
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<dd><code><a href="../../../edu/rit/crypto/HashFunction.html#hash(byte[], int, int)">hash</a></code> in interface <code><a href="../../../edu/rit/crypto/HashFunction.html" title="interface in edu.rit.crypto">HashFunction</a></code></dd>
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<dt><span class="strong">Parameters:</span></dt><dd><code>buf</code> - Array of message bytes.</dd><dd><code>off</code> - Index of first message byte to hash.</dd><dd><code>len</code> - Number of message bytes to hash.</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - (unchecked exception) Thrown if <TT>buf</TT> is null.</dd>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">IndexOutOfBoundsException</a></code> - (unchecked exception) Thrown if <TT>off</TT> < 0, <TT>len</TT>
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< 0, or <TT>off+len</TT> > <TT>buf.length</TT>.</dd></dl>
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<a name="digest(byte[])">
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<h4>digest</h4>
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<pre>public void digest(byte[] digest)</pre>
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<div class="block">Obtain the message digest. <TT>digest</TT> must be an array of bytes
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whose length is equal to <TT>digestSize()</TT>. The message consists of
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the series of bytes provided to the <TT>hash()</TT> methods. The digest
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of the message is stored in the <TT>digest</TT> array. Afterwards, this
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hash function is reset.</div>
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<dl>
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<dt><strong>Specified by:</strong></dt>
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<dd><code><a href="../../../edu/rit/crypto/HashFunction.html#digest(byte[])">digest</a></code> in interface <code><a href="../../../edu/rit/crypto/HashFunction.html" title="interface in edu.rit.crypto">HashFunction</a></code></dd>
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<dt><span class="strong">Parameters:</span></dt><dd><code>digest</code> - Message digest (output).</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - (unchecked exception) Thrown if <TT>digest</TT> is null.</dd>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">IndexOutOfBoundsException</a></code> - (unchecked exception) Thrown if <TT>digest.length</TT> ≠
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<TT>digestSize()</TT>.</dd></dl>
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</li>
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<a name="reset()">
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<h4>reset</h4>
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<pre>public void reset()</pre>
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<div class="block">Reset this hash function. Any accumulated message bytes are discarded,
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and the digest computation starts afresh.</div>
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<dl>
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<dt><strong>Specified by:</strong></dt>
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<dd><code><a href="../../../edu/rit/crypto/HashFunction.html#reset()">reset</a></code> in interface <code><a href="../../../edu/rit/crypto/HashFunction.html" title="interface in edu.rit.crypto">HashFunction</a></code></dd>
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<p class="legalCopy"><small><FONT SIZE="-2">Copyright © 2013–2016 by Alan Kaminsky. All rights reserved. Send comments to ark</FONT><FONT SIZE="1" COLOR="#FFFFFF">­</FONT><FONT SIZE="-2">@</FONT><FONT SIZE="1" COLOR="#FFFFFF">­</FONT><FONT SIZE="-2">cs.rit.edu.</FONT></small></p>
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