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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).




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