RC4/ARCFOUR Implementation in PHP
I wrote this RC4/ARCFOUR implementation in PHP - based on the original C source code posted on usenet in 1994. The rc4() call itself is completely self-contained, two other methods rc4_test() and rc4_benchmark() have been provided for testing and are optional.
My motivation for writing it was to replace the dependency on MCrypt in my SpamKit plugin for Wordpress - see Gerry's site for the updated TBT code I will wrap in the next SpamKit Plugin release.
This is software is completely public domain, all I ask for is a simple credit for my work if you find it useful.
View Source: rc4.php
View Source: rc4tests.php
Examples:
1. Simple encryption & decryption
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<?php
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require_once( "rc4.php" );
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$key = "0123456789abcdef";
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$plaintext = "Hello World!";
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$ciphertext = rc4( $key, $plaintext );
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$decrypted = rc4( $key, $ciphertext );
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?>
2. Execute the tests and display the results
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<?php
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require_once( "rc4tests.php" ); // Auto includes rc4.php
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?>
3. Execute the tests as benchmarks and display the results
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<?php
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require_once( "rc4tests.php" ); // Auto includes rc4.php
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?>
