Mcrypt ciphers

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Mcrypt ciphers



  Here is a list of ciphers which are currently supported by the mcrypt
  extension.  For a complete list of supported ciphers, see the defines at
  the end of mcrypt.h. The general rule with the
  mcrypt-2.2.x API is that you can access the cipher from PHP with
  MCRYPT_ciphername. With the libmcrypt-2.4.x and libmcrypt-2.5.x API these constants also work,
  but it is possible to specify the name of the cipher as a string with a
  call to mcrypt_module_open().
  
   MCRYPT_3DES
   MCRYPT_ARCFOUR_IV (libmcrypt > 2.4.x only)
   MCRYPT_ARCFOUR (libmcrypt > 2.4.x only)
   MCRYPT_BLOWFISH
   MCRYPT_CAST_128
   MCRYPT_CAST_256
   MCRYPT_CRYPT
   MCRYPT_DES
   MCRYPT_DES_COMPAT (libmcrypt 2.2.x only)
   MCRYPT_ENIGMA (libmcrypt > 2.4.x only, alias for MCRYPT_CRYPT)
   MCRYPT_GOST
   MCRYPT_IDEA (non-free)
   MCRYPT_LOKI97 (libmcrypt > 2.4.x only)
   MCRYPT_MARS (libmcrypt > 2.4.x only, non-free)
   MCRYPT_PANAMA (libmcrypt > 2.4.x only)
   MCRYPT_RIJNDAEL_128 (libmcrypt > 2.4.x only)
   MCRYPT_RIJNDAEL_192 (libmcrypt > 2.4.x only)
   MCRYPT_RIJNDAEL_256 (libmcrypt > 2.4.x only)
   MCRYPT_RC2
   MCRYPT_RC4 (libmcrypt 2.2.x only)
   MCRYPT_RC6 (libmcrypt > 2.4.x only)
   MCRYPT_RC6_128 (libmcrypt 2.2.x only)
   MCRYPT_RC6_192 (libmcrypt 2.2.x only)
   MCRYPT_RC6_256 (libmcrypt 2.2.x only)
   MCRYPT_SAFER64
   MCRYPT_SAFER128
   MCRYPT_SAFERPLUS (libmcrypt > 2.4.x only)
   MCRYPT_SERPENT(libmcrypt > 2.4.x only)
   MCRYPT_SERPENT_128 (libmcrypt 2.2.x only)
   MCRYPT_SERPENT_192 (libmcrypt 2.2.x only)
   MCRYPT_SERPENT_256 (libmcrypt 2.2.x only)
   MCRYPT_SKIPJACK (libmcrypt > 2.4.x only)
   MCRYPT_TEAN (libmcrypt 2.2.x only)
   MCRYPT_THREEWAY
   MCRYPT_TRIPLEDES (libmcrypt > 2.4.x only)
   MCRYPT_TWOFISH (for older mcrypt 2.x versions, or mcrypt > 2.4.x )
   MCRYPT_TWOFISH128 (TWOFISHxxx are available in newer 2.x versions, but not in the 2.4.x versions)
   MCRYPT_TWOFISH192
   MCRYPT_TWOFISH256
   MCRYPT_WAKE (libmcrypt > 2.4.x only)
   MCRYPT_XTEA (libmcrypt > 2.4.x only)
  




  You must (in CFB and OFB mode)
  or can (in CBC mode) supply an
  initialization vector (IV) to the respective cipher function. The
  IV must be unique and must be the same when
  decrypting/encrypting. With data which is stored encrypted, you
  can take the output of a function of the index under which the
  data is stored (e.g.  the MD5 key of the filename).
  Alternatively, you can transmit the IV together with the encrypted
  data (see chapter 9.3 of Applied Cryptography by Schneier (ISBN 0-471-11709-9) for a
  discussion of this topic).