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<div class="subTitle">DGK_crypto_scheme</div>
<h2 title="Class DGK_scheme" class="title">Class DGK_scheme</h2>
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<li>java.lang.Object</li>
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<li>DGK_crypto_scheme.DGK_scheme</li>
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<pre>public class <span class="strong">DGK_scheme</span>
extends java.lang.Object</pre>
<dl><dt><span class="strong">Author:</span></dt>
<dd>raisaro</dd></dl>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>private java.lang.Boolean</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#canDecrypt">canDecrypt</a></strong></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#g">g</a></strong></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#h">h</a></strong></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private int</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#k">k</a></strong></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private int</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#l">l</a></strong></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#n">n</a></strong></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#p">p</a></strong></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#pp_inv">pp_inv</a></strong></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#q">q</a></strong></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#qq_inv">qq_inv</a></strong></code>&nbsp;</td>
</tr>
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<td class="colFirst"><code>private java.lang.Boolean</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#secretKeyValid">secretKeyValid</a></strong></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private int</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#t">t</a></strong></code>&nbsp;</td>
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<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#u">u</a></strong></code>&nbsp;</td>
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<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#vpvq">vpvq</a></strong></code>&nbsp;</td>
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<td class="colOne"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#DGK_scheme(java.math.BigInteger[], java.math.BigInteger[], int, int, int)">DGK_scheme</a></strong>(java.math.BigInteger[]&nbsp;pk,
java.math.BigInteger[]&nbsp;sk,
int&nbsp;ka,
int&nbsp;ti,
int&nbsp;ell)</code>&nbsp;</td>
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<tr class="rowColor">
<td class="colOne"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#DGK_scheme(java.math.BigInteger[], int, int, int)">DGK_scheme</a></strong>(java.math.BigInteger[]&nbsp;pk,
int&nbsp;ti,
int&nbsp;ell,
int&nbsp;ka)</code>&nbsp;</td>
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<td class="colFirst"><code>java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#decryption(java.math.BigInteger)">decryption</a></strong>(java.math.BigInteger&nbsp;cipher)</code>
<div class="block">DGK Decryption.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#decryptionZero(java.math.BigInteger)">decryptionZero</a></strong>(java.math.BigInteger&nbsp;cipher)</code>
<div class="block">DGK "zero decryption".</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#decryptionZeroCRT(java.math.BigInteger)">decryptionZeroCRT</a></strong>(java.math.BigInteger&nbsp;cipher)</code>
<div class="block">DGK "zero decryption".</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#ecryptionCRT(java.math.BigInteger)">ecryptionCRT</a></strong>(java.math.BigInteger&nbsp;message)</code>
<div class="block">DGK encryption using CRT for the owner of the private key.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../DGK_crypto_scheme/DGK_scheme.html#encryption(java.math.BigInteger)">encryption</a></strong>(java.math.BigInteger&nbsp;message)</code>
<div class="block">Standard DGK encryption</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>private&nbsp;int k</pre>
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<pre>private&nbsp;java.math.BigInteger n</pre>
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<pre>private&nbsp;java.math.BigInteger g</pre>
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<pre>private&nbsp;java.math.BigInteger h</pre>
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<pre>private&nbsp;java.math.BigInteger u</pre>
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<a name="canDecrypt">
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<h4>canDecrypt</h4>
<pre>private&nbsp;java.lang.Boolean canDecrypt</pre>
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<pre>private&nbsp;java.math.BigInteger p</pre>
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<pre>private&nbsp;java.math.BigInteger q</pre>
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<pre>private&nbsp;java.math.BigInteger vpvq</pre>
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<h4>secretKeyValid</h4>
<pre>private&nbsp;java.lang.Boolean secretKeyValid</pre>
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<h4>pp_inv</h4>
<pre>private&nbsp;java.math.BigInteger pp_inv</pre>
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<pre>private&nbsp;java.math.BigInteger qq_inv</pre>
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<h3>Constructor Detail</h3>
<a name="DGK_scheme(java.math.BigInteger[], java.math.BigInteger[], int, int, int)">
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<h4>DGK_scheme</h4>
<pre>public&nbsp;DGK_scheme(java.math.BigInteger[]&nbsp;pk,
java.math.BigInteger[]&nbsp;sk,
int&nbsp;ka,
int&nbsp;ti,
int&nbsp;ell)</pre>
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<h4>DGK_scheme</h4>
<pre>public&nbsp;DGK_scheme(java.math.BigInteger[]&nbsp;pk,
int&nbsp;ti,
int&nbsp;ell,
int&nbsp;ka)</pre>
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<h4>encryption</h4>
<pre>public&nbsp;java.math.BigInteger&nbsp;encryption(java.math.BigInteger&nbsp;message)</pre>
<div class="block">Standard DGK encryption</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>message</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd>E[message, r] = cipher</dd></dl>
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<h4>ecryptionCRT</h4>
<pre>public&nbsp;java.math.BigInteger&nbsp;ecryptionCRT(java.math.BigInteger&nbsp;message)
throws <a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></pre>
<div class="block">DGK encryption using CRT for the owner of the private key. It is faster
than the standard DGK encryption.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>message</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd>E[message, r] = cipher</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></code></dd></dl>
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<h4>decryptionZero</h4>
<pre>public&nbsp;boolean&nbsp;decryptionZero(java.math.BigInteger&nbsp;cipher)
throws <a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></pre>
<div class="block">DGK "zero decryption".
This method only checks if or not the ciphertext is an encryption of zero, or not</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cipher</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the cipher is an encryption of zero, false otherwise</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></code></dd></dl>
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<h4>decryptionZeroCRT</h4>
<pre>public&nbsp;boolean&nbsp;decryptionZeroCRT(java.math.BigInteger&nbsp;cipher)
throws <a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></pre>
<div class="block">DGK "zero decryption". Using CRT.
This method only checks if or not the ciphertext is an encryption of zero, or not</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cipher</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the cipher is an encryption of zero, false otherwise</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></code></dd></dl>
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<h4>decryption</h4>
<pre>public&nbsp;java.math.BigInteger&nbsp;decryption(java.math.BigInteger&nbsp;cipher)
throws <a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></pre>
<div class="block">DGK Decryption.
This method can be used for decryption</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cipher</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></code></dd></dl>
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