Vous avez cherché: libmcrypt (Coréen - Anglais)

mcrypt_rc4 (libmcrypt 2.2.x only)
mcrypt_safer128

mcrypt_arcfour (libmcrypt 2.4.x only)
mcrypt_arcfour (libmcrypt 2.4.x only)

mcrypt_rc6_128 (libmcrypt 2.2.x only)
mcrypt_serpent_128 (libmcrypt 2.2.x only)

mcrypt_arcfour_iv (libmcrypt 2.4.x only)
mcrypt_arcfour_iv (libmcrypt 2.4.x only)

mcrypt_mars (libmcrypt 2.4.x only, non-free)
mcrypt_rijndael_128 (libmcrypt 2.4.x only)

mcrypt_enigma (libmcrypt 2.4.x only, alias for mcrypt_crypt)
mcrypt_gost

the first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x.
(php 3 = 3.0.8, php 4)

if you linked against libmcrypt 2.4.x, these functions are still available, but it is recommended that you use the advanced functions.
the behaviour of these functions is affected by settings in php.ini.

the above example will produce a list with all supported algorithms in the "/usr/local/lib/libmcrypt" directory.
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if you linked against libmcrypt 2.4.x, the following additional block algorithms are supported: cast, loki97, rijndael, saferplus, serpent and the following stream ciphers: enigma (crypt), panama, rc4 and wake. with libmcrypt 2.4.x another cipher mode is also available; nofb.
windows users will find all the needed compiled mcrypt binaries here.