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<title>Class Poco::Crypto::CryptoTransform</title>
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<h1 class="namespace"><a href="Poco.Crypto.html" class="namespace">Poco::Crypto</a></h1>
<h1 class="symbol">class CryptoTransform</h1>
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<p>
<b>Library:</b> Crypto<br />
<b>Package:</b> Cipher<br />
<b>Header:</b> Poco/Crypto/CryptoTransform.h</p>
<h2>Description</h2>
<div class="description">
<p>This interface represents the basic operations for cryptographic transformations to be used with a <a href="Poco.Crypto.CryptoInputStream.html" title="class Poco::Crypto::CryptoInputStream">CryptoInputStream</a> or a <a href="Poco.Crypto.CryptoOutputStream.html" title="class Poco::Crypto::CryptoOutputStream">CryptoOutputStream</a>. </p>
<p>Implementations of this class are returned by the <a href="Poco.Crypto.Cipher.html" title="class Poco::Crypto::Cipher">Cipher</a> class to perform encryption or decryption of data. </p>
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<h2>Member Summary</h2>
<p><b>Member Functions: </b><a href="Poco.Crypto.CryptoTransform.html#198" title="Poco::Crypto::CryptoTransform::blockSize()">blockSize</a>, <a href="Poco.Crypto.CryptoTransform.html#204" title="Poco::Crypto::CryptoTransform::finalize()">finalize</a>, <a href="Poco.Crypto.CryptoTransform.html#199" title="Poco::Crypto::CryptoTransform::transform()">transform</a></p>
<h2>Constructors</h2>
<h3><a name="196">CryptoTransform</a></h3>
<p class="decl"><a href="Poco.Crypto.CryptoTransform.html" title="class Poco::Crypto::CryptoTransform">CryptoTransform</a>();</p>
<div class="description">
<p>Creates a new <a href="Poco.Crypto.CryptoTransform.html" title="class Poco::Crypto::CryptoTransform">CryptoTransform</a> object. </p>
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<h2>Destructor</h2>
<h3><a name="197">~CryptoTransform</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">virtual ~<a href="Poco.Crypto.CryptoTransform.html" title="class Poco::Crypto::CryptoTransform">CryptoTransform</a>();</p>
<div class="description">
<p>Destroys the <a href="Poco.Crypto.CryptoTransform.html" title="class Poco::Crypto::CryptoTransform">CryptoTransform</a>. </p>
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<h2>Member Functions</h2>
<h3><a name="198">blockSize</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">virtual std::size_t blockSize() const = 0;</p>
<div class="description">
<p>Returns the block size for this <a href="Poco.Crypto.CryptoTransform.html" title="class Poco::Crypto::CryptoTransform">CryptoTransform</a>. </p>
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<h3><a name="204">finalize</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">virtual std::streamsize finalize(<br /> unsigned char * output,<br /> std::streamsize length<br />) = 0;</p>
<div class="description">
<p>Finalizes the transformation. The output buffer must contain enough space for at least one block, ie. </p>
<pre>length >= bufferSize()
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<p>must be true. Returns the number of bytes written to the output buffer. </p>
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<h3><a name="199">transform</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">virtual std::streamsize transform(<br /> const unsigned char * input,<br /> std::streamsize inputLength,<br /> unsigned char * output,<br /> std::streamsize outputLength<br />) = 0;</p>
<div class="description">
<p>Transforms a chunk of data. The inputLength is arbitrary and does not need to be a multiple of the block size. The output buffer has a maximum capacity of the given outputLength that must be at least </p>
<pre>inputLength + bufferSize() - 1
</pre>
<p>Returns the number of bytes written to the output buffer. </p>
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<p class="footer">POCO C++ Libraries 1.3.6-all<br />
Copyright © 2009, <a href="http://pocoproject.org/" target="_blank">Applied Informatics Software Engineering GmbH and Contributors</a></p>
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