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<div class="subTitle">crypto_scheme</div>
<h2 title="Class Scheme" class="title">Class Scheme</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="strong">Scheme</span>
extends java.lang.Object</pre>
<dl><dt><span class="strong">Author:</span></dt>
<dd>raisaro</dd></dl>
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<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#canDecrypt">canDecrypt</a></strong></code>&nbsp;</td>
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<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#canEncrypt">canEncrypt</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="../crypto_scheme/Scheme.html#g">g</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="../crypto_scheme/Scheme.html#h">h</a></strong></code>&nbsp;</td>
</tr>
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<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#n">n</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="../crypto_scheme/Scheme.html#nsqr">nsqr</a></strong></code>&nbsp;</td>
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<td class="colFirst"><code>private java.util.Random</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#prng">prng</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="../crypto_scheme/Scheme.html#x">x</a></strong></code>&nbsp;</td>
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<td class="colOne"><code><strong><a href="../crypto_scheme/Scheme.html#Scheme(java.math.BigInteger, java.math.BigInteger, java.math.BigInteger)">Scheme</a></strong>(java.math.BigInteger&nbsp;N,
java.math.BigInteger&nbsp;G,
java.math.BigInteger&nbsp;H)</code>&nbsp;</td>
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<td class="colOne"><code><strong><a href="../crypto_scheme/Scheme.html#Scheme(java.math.BigInteger, java.math.BigInteger, java.math.BigInteger, java.math.BigInteger)">Scheme</a></strong>(java.math.BigInteger&nbsp;N,
java.math.BigInteger&nbsp;G,
java.math.BigInteger&nbsp;H,
java.math.BigInteger&nbsp;X)</code>&nbsp;</td>
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<td class="colFirst"><code>java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#decrypt(java.math.BigInteger[])">decrypt</a></strong>(java.math.BigInteger[]&nbsp;cipher)</code>
<div class="block">Decrypts the given ciphertext, which was previously encrypted using
the public key given to this instance of the class.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>java.math.BigInteger[]</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#encrypt(java.math.BigInteger)">encrypt</a></strong>(java.math.BigInteger&nbsp;plain)</code>
<div class="block">Encrypts the given plaintext to produce ciphertext.</div>
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<td class="colFirst"><code>java.math.BigInteger[]</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#encrypt(java.math.BigInteger, java.math.BigInteger, java.math.BigInteger)">encrypt</a></strong>(java.math.BigInteger&nbsp;plain,
java.math.BigInteger&nbsp;gPOWr,
java.math.BigInteger&nbsp;hPOWr)</code>
<div class="block">Encrypts the given plaintext to produce ciphertext.</div>
</td>
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<td class="colFirst"><code>private long</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#gcd(long, long)">gcd</a></strong>(long&nbsp;first,
long&nbsp;second)</code>
<div class="block">Computes the greatest common denominator of two numbers.</div>
</td>
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<td class="colFirst"><code>private java.math.BigInteger</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#lcm(java.math.BigInteger, java.math.BigInteger)">lcm</a></strong>(java.math.BigInteger&nbsp;first,
java.math.BigInteger&nbsp;second)</code>
<div class="block">Computes the least common multiple of two numbers.</div>
</td>
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<td class="colFirst"><code>private long</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#lcm(long, long)">lcm</a></strong>(long&nbsp;first,
long&nbsp;second)</code>
<div class="block">Computes the least common multiple of two numbers.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.math.BigInteger[]</code></td>
<td class="colLast"><code><strong><a href="../crypto_scheme/Scheme.html#proxyDecription(java.math.BigInteger[])">proxyDecription</a></strong>(java.math.BigInteger[]&nbsp;cipher)</code>
<div class="block">Partially Decrypts the given ciphertext, which was previously encrypted using
the public key given to this instance of the class.</div>
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<pre>private&nbsp;boolean canEncrypt</pre>
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<pre>private&nbsp;boolean canDecrypt</pre>
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<pre>private&nbsp;java.math.BigInteger x</pre>
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<h4>g</h4>
<pre>private&nbsp;java.math.BigInteger g</pre>
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<h4>h</h4>
<pre>private&nbsp;java.math.BigInteger h</pre>
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<h4>n</h4>
<pre>private&nbsp;java.math.BigInteger n</pre>
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<pre>private&nbsp;java.math.BigInteger nsqr</pre>
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<h4>prng</h4>
<pre>private&nbsp;java.util.Random prng</pre>
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<h4>Scheme</h4>
<pre>public&nbsp;Scheme(java.math.BigInteger&nbsp;N,
java.math.BigInteger&nbsp;G,
java.math.BigInteger&nbsp;H,
java.math.BigInteger&nbsp;X)</pre>
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<h4>Scheme</h4>
<pre>public&nbsp;Scheme(java.math.BigInteger&nbsp;N,
java.math.BigInteger&nbsp;G,
java.math.BigInteger&nbsp;H)</pre>
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<h4>encrypt</h4>
<pre>public&nbsp;java.math.BigInteger[]&nbsp;encrypt(java.math.BigInteger&nbsp;plain,
java.math.BigInteger&nbsp;gPOWr,
java.math.BigInteger&nbsp;hPOWr)
throws <a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></pre>
<div class="block">Encrypts the given plaintext to produce ciphertext.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>plain</code> - </dd><dd><code>gPOWr</code> - </dd><dd><code>hPOWr</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd>The encrypted value of the plaintext, modulo n^2.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></code> - CryptoException If the encryption cannot be performed or
there is an error while encrypting
the plaintext.</dd></dl>
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<h4>encrypt</h4>
<pre>public&nbsp;java.math.BigInteger[]&nbsp;encrypt(java.math.BigInteger&nbsp;plain)
throws <a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></pre>
<div class="block">Encrypts the given plaintext to produce ciphertext.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>plain</code> - The plaintext.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The encrypted value of the plaintext, modulo n^2.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></code> - If the encryption cannot be performed or
there is an error while encrypting
the plaintext.</dd></dl>
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<h4>decrypt</h4>
<pre>public&nbsp;java.math.BigInteger&nbsp;decrypt(java.math.BigInteger[]&nbsp;cipher)
throws <a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></pre>
<div class="block">Decrypts the given ciphertext, which was previously encrypted using
the public key given to this instance of the class. This method will
throw an exception if no decryption keys were defined.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cipher</code> - The ciphertext.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The decrypted value of the plaintext, modulo n.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></code> - If the decryption fails.</dd></dl>
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<h4>proxyDecription</h4>
<pre>public&nbsp;java.math.BigInteger[]&nbsp;proxyDecription(java.math.BigInteger[]&nbsp;cipher)
throws <a href="../crypto_scheme/CryptoException.html" title="class in crypto_scheme">CryptoException</a></pre>
<div class="block">Partially Decrypts the given ciphertext, which was previously encrypted using
the public key given to this instance of the class. This method will
throw an exception if no decryption keys were defined. The private key used
must be part of the original private key</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cipher</code> - </dd><dd><code>x1</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd>The modified cipher text which can be finally decrypted by the other
part of the original private key</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>lcm</h4>
<pre>private&nbsp;long&nbsp;lcm(long&nbsp;first,
long&nbsp;second)</pre>
<div class="block">Computes the least common multiple of two numbers.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>first</code> - First number.</dd><dd><code>second</code> - Second number.</dd>
<dt><span class="strong">Returns:</span></dt><dd>LCM of the two numbers.</dd></dl>
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<pre>private&nbsp;java.math.BigInteger&nbsp;lcm(java.math.BigInteger&nbsp;first,
java.math.BigInteger&nbsp;second)</pre>
<div class="block">Computes the least common multiple of two numbers.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>first</code> - First number.</dd><dd><code>second</code> - Second number.</dd>
<dt><span class="strong">Returns:</span></dt><dd>LCM of the two numbers.</dd></dl>
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<pre>private&nbsp;long&nbsp;gcd(long&nbsp;first,
long&nbsp;second)</pre>
<div class="block">Computes the greatest common denominator of two numbers.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>first</code> - First number.</dd><dd><code>second</code> - Second number.</dd>
<dt><span class="strong">Returns:</span></dt><dd>GCD of the two numbers.</dd></dl>
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