php-hce_md5
PHP Hash Chaining Encryption using MD5
This package implements a Hash Chaining method of encryption using MD5 for the hash algorithm. It is copied from the perl module Crypt::HCE_MD5. By combining a secret digest and a public digest, you can achieve encryption and decryption of plaintext.
WARNING: Please be warned that significant advancements in MD5 hash cracking have occurred in the past decade, so MD5 is considered a fairly weak hash to use for any purpose that involves authentication.
Usage:
require "hce_md5.class.php"; /* Instantiate a new object */ $md5 = new hce_md5($pubKey, $privKey); /* Returns a binary blob 16 bytes long, but most apps/urls tend to * deal with the base64 encoded version, so convert it afterwards. */ $encrypted = $md5->hce_block_encrypt($plaintext); $b64encrypted = base64_encode($encrypted); /* Assuming the incoming value is base64, convert it to a binary blob * and decrypt it. The returned value will not be base64 encoded. */ $to_decrypt = base64_decode($b64encrypted); $decrypted = $md5->hce_block_decrypt($to_decrypt); /* At this point, $decrypted is equal to original $plaintext */