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<?xml version="1.0" encoding="ascii"?>
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<a href="Crypto-module.html">Package Crypto</a> ::
<a href="Crypto.Cipher-module.html">Package Cipher</a> ::
<a href="Crypto.Cipher.PKCS1_OAEP-module.html">Module PKCS1_OAEP</a> ::
Class PKCS1OAEP_Cipher
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class PKCS1OAEP_Cipher</h1><p class="nomargin-top"></p>
This cipher can perform PKCS#1 v1.5 OAEP encryption or decryption.
<!-- ==================== INSTANCE METHODS ==================== -->
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<td><span class="summary-sig"><a href="Crypto.Cipher.PKCS1_OAEP.PKCS1OAEP_Cipher-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">key</span>,
<span class="summary-sig-arg">hashAlgo</span>,
<span class="summary-sig-arg">mgfunc</span>,
<span class="summary-sig-arg">label</span>)</span><br />
Initialize this PKCS#1 OAEP cipher object.</td>
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</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a name="can_encrypt"></a><span class="summary-sig-name">can_encrypt</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return True/1 if this cipher object can be used for encryption.</td>
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<td><span class="summary-sig"><a name="can_decrypt"></a><span class="summary-sig-name">can_decrypt</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return True/1 if this cipher object can be used for decryption.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="Crypto.Cipher.PKCS1_OAEP.PKCS1OAEP_Cipher-class.html#encrypt" class="summary-sig-name">encrypt</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">message</span>)</span><br />
Produce the PKCS#1 OAEP encryption of a message.</td>
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</td>
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<td><span class="summary-sig"><a href="Crypto.Cipher.PKCS1_OAEP.PKCS1OAEP_Cipher-class.html#decrypt" class="summary-sig-name">decrypt</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">ct</span>)</span><br />
Decrypt a PKCS#1 OAEP ciphertext.</td>
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<a name="__init__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">key</span>,
<span class="sig-arg">hashAlgo</span>,
<span class="sig-arg">mgfunc</span>,
<span class="sig-arg">label</span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
Initialize this PKCS#1 OAEP cipher object.
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>key</code></strong> (an RSA key object) - If a private half is given, both encryption and decryption are possible.
If a public half is given, only encryption is possible.</li>
<li><strong class="pname"><code>hashAlgo</code></strong> (hash object) - The hash function to use. This can be a module under <a href="Crypto.Hash-module.html" class="link">Crypto.Hash</a>
or an existing hash object created from any of such modules. If not specified,
<a href="Crypto.Hash.SHA-module.html" class="link">Crypto.Hash.SHA</a> (that is, SHA-1) is used.</li>
<li><strong class="pname"><code>mgfunc</code></strong> (callable) - A mask generation function that accepts two parameters: a string to
use as seed, and the lenth of the mask to generate, in bytes.
If not specified, the standard MGF1 is used (a safe choice).</li>
<li><strong class="pname"><code>label</code></strong> (string) - A label to apply to this particular encryption. If not specified,
an empty string is used. Specifying a label does not improve
security.</li>
</ul></dd>
</dl>
<div class="fields"> <p><strong>Attention:</strong>
Modify the mask generation function only if you know what you are doing.
Sender and receiver must use the same one.
</p>
</div></td></tr></table>
</div>
<a name="encrypt"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">encrypt</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">message</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Produce the PKCS#1 OAEP encryption of a message.</p>
<p>This function is named <tt class="rst-docutils literal"><span class="pre">RSAES-OAEP-ENCRYPT</span></tt>, and is specified in
section 7.1.1 of RFC3447.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>message</code></strong> (string) - The message to encrypt, also known as plaintext. It can be of
variable length, but not longer than the RSA modulus (in bytes)
minus 2, minus twice the hash output size.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>A string, the ciphertext in which the message is encrypted.
It is as long as the RSA modulus (in bytes).</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If the RSA key length is not sufficiently long to deal with the given
message.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="decrypt"></a>
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<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">decrypt</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">ct</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Decrypt a PKCS#1 OAEP ciphertext.</p>
<p>This function is named <tt class="rst-docutils literal"><span class="pre">RSAES-OAEP-DECRYPT</span></tt>, and is specified in
section 7.1.2 of RFC3447.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>ct</code></strong> (string) - The ciphertext that contains the message to recover.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>A string, the original message.</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If the ciphertext length is incorrect, or if the decryption does not
succeed.</li>
<li><code><strong class='fraise'>TypeError</strong></code> - If the RSA key has no private half.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
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