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RC4_set_key.html
<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>RC4_set_key</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <ul id="index"> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#NOTE">NOTE</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>RC4_set_key, RC4 - RC4 encryption</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/rc4.h> void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data); void RC4(RC4_KEY *key, unsigned long len, const unsigned char *indata, unsigned char *outdata);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>This library implements the Alleged RC4 cipher, which is described for example in <i>Applied Cryptography</i>. It is believed to be compatible with RC4[TM], a proprietary cipher of RSA Security Inc.</p> <p>RC4 is a stream cipher with variable key length. Typically, 128 bit (16 byte) keys are used for strong encryption, but shorter insecure key sizes have been widely used due to export restrictions.</p> <p>RC4 consists of a key setup phase and the actual encryption or decryption phase.</p> <p>RC4_set_key() sets up the <b>RC4_KEY</b> <b>key</b> using the <b>len</b> bytes long key at <b>data</b>.</p> <p>RC4() encrypts or decrypts the <b>len</b> bytes of data at <b>indata</b> using <b>key</b> and places the result at <b>outdata</b>. Repeated RC4() calls with the same <b>key</b> yield a continuous key stream.</p> <p>Since RC4 is a stream cipher (the input is XORed with a pseudo-random key stream to produce the output), decryption uses the same function calls as encryption.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>RC4_set_key() and RC4() do not return values.</p> <h1 id="NOTE">NOTE</h1> <p>Applications should use the higher level functions <a href="../man3/EVP_EncryptInit.html">EVP_EncryptInit(3)</a> etc. instead of calling these functions directly.</p> <p>It is difficult to securely use stream ciphers. For example, do not perform multiple encryptions using the same key stream.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/EVP_EncryptInit.html">EVP_EncryptInit(3)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>
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