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<a href="Crypto-module.html">Package Crypto</a> ::
<a href="Crypto.Cipher-module.html">Package Cipher</a> ::
Module PKCS1_OAEP
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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module PKCS1_OAEP</h1><p class="nomargin-top"></p>
<p>RSA encryption protocol according to PKCS#1 OAEP</p>
<p>See <a class="rst-reference external" href="http://www.ietf.org/rfc/rfc3447.txt" target="_top">RFC3447</a> or the <a class="rst-reference external" href="http://www.rsa.com/rsalabs/node.asp?id=2125." target="_top">original RSA Labs specification</a> .</p>
<p>This scheme is more properly called <tt class="rst-docutils literal"><span class="pre">RSAES-OAEP</span></tt>.</p>
<p>As an example, a sender may encrypt a message in this way:</p>
<blockquote>
<pre class="py-doctest">
<span class="py-prompt">>>> </span><span class="py-keyword">from</span> Crypto.Cipher <span class="py-keyword">import</span> PKCS1_OAEP
<span class="py-prompt">>>> </span><span class="py-keyword">from</span> Crypto.PublicKey <span class="py-keyword">import</span> RSA
<span class="py-prompt">>>></span>
<span class="py-prompt">>>> </span>message = <span class="py-string">'To be encrypted'</span>
<span class="py-prompt">>>> </span>key = RSA.importKey(open(<span class="py-string">'pubkey.der'</span>).read())
<span class="py-prompt">>>> </span>cipher = PKCS1_OAEP.new(key)
<span class="py-prompt">>>> </span>ciphertext = cipher.encrypt(message)</pre>
</blockquote>
<p>At the receiver side, decryption can be done using the private part of
the RSA key:</p>
<blockquote>
<pre class="py-doctest">
<span class="py-prompt">>>> </span>key = RSA.importKey(open(<span class="py-string">'privkey.der'</span>).read())
<span class="py-prompt">>>> </span>cipher = PKCS1_OAP.new(key)
<span class="py-prompt">>>> </span>message = cipher.decrypt(ciphertext)</pre>
</blockquote>
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<span class="summary-type"> </span>
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<a href="Crypto.Cipher.PKCS1_OAEP.PKCS1OAEP_Cipher-class.html" class="summary-name">PKCS1OAEP_Cipher</a><br />
This cipher can perform PKCS#1 v1.5 OAEP encryption or decryption.
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<!-- ==================== FUNCTIONS ==================== -->
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<span class="table-header">Functions</span></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-module.html#new" class="summary-sig-name">new</a>(<span class="summary-sig-arg">key</span>,
<span class="summary-sig-arg">hashAlgo</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">mgfunc</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">label</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string"></code><code class="variable-quote">'</code></span>)</span><br />
Return a cipher object <a href="Crypto.Cipher.PKCS1_OAEP.PKCS1OAEP_Cipher-class.html" class="link">PKCS1OAEP_Cipher</a> that can be used to perform PKCS#1 OAEP encryption or decryption.</td>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">new</span>(<span class="sig-arg">key</span>,
<span class="sig-arg">hashAlgo</span>=<span class="sig-default">None</span>,
<span class="sig-arg">mgfunc</span>=<span class="sig-default">None</span>,
<span class="sig-arg">label</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string"></code><code class="variable-quote">'</code></span>)</span>
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Return a cipher object <a href="Crypto.Cipher.PKCS1_OAEP.PKCS1OAEP_Cipher-class.html" class="link">PKCS1OAEP_Cipher</a> that can be used to perform PKCS#1 OAEP encryption or decryption.
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>key</code></strong> (RSA key object) - The key to use to encrypt or decrypt the message. This is a <a href="Crypto.PublicKey.RSA-module.html" class="link">Crypto.PublicKey.RSA</a> object.
Decryption is only possible if <em>key</em> is a private RSA key.</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.
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