List of ciphers which are currently supported by the mcrypt extension (libmcrypt-2.5.x API). 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 & libmcrypt-2.5.x API it is possible to specify the name of the cipher as a string with a call to mcrypt_module_open()

1. MCRYPT_3DES
2. MCRYPT_ARCFOUR_IV (libmcrypt > 2.4.x only)
3. MCRYPT_ARCFOUR (libmcrypt > 2.4.x only)
4. MCRYPT_RC2
5. MCRYPT_RC4 (libmcrypt 2.2.x only)
6. MCRYPT_RC6 (libmcrypt > 2.4.x only)
7. MCRYPT_RC6_128 (libmcrypt 2.2.x only)
8. MCRYPT_RC6_192 (libmcrypt 2.2.x only)
9. MCRYPT_RC6_256 (libmcrypt 2.2.x only)
10. MCRYPT_CAST_128
11. MCRYPT_CAST_256
12. MCRYPT_CRYPT
13. MCRYPT_BLOWFISH
14. MCRYPT_DES
15. MCRYPT_DES_COMPAT (libmcrypt 2.2.x only)
16. MCRYPT_ENIGMA (libmcrypt > 2.4.x only, alias for MCRYPT_CRYPT)
17. MCRYPT_GOST
18. MCRYPT_MARS (libmcrypt > 2.4.x only, non-free)
19. MCRYPT_PANAMA (libmcrypt > 2.4.x only)
20. MCRYPT_RIJNDAEL_128 (libmcrypt > 2.4.x only)
21. MCRYPT_RIJNDAEL_192 (libmcrypt > 2.4.x only)
22. MCRYPT_RIJNDAEL_256 (libmcrypt > 2.4.x only)
23. MCRYPT_IDEA (non-free)
24. MCRYPT_LOKI97 (libmcrypt > 2.4.x only)
25. MCRYPT_SAFER64
26. MCRYPT_SAFER128
27. MCRYPT_SAFERPLUS (libmcrypt > 2.4.x only)
28. MCRYPT_SERPENT(libmcrypt > 2.4.x only)
29. MCRYPT_SKIPJACK (libmcrypt > 2.4.x only)
30. MCRYPT_TEAN (libmcrypt 2.2.x only)
31. MCRYPT_THREEWAY
32. MCRYPT_TRIPLEDES (libmcrypt > 2.4.x only)
33. MCRYPT_TWOFISH (for older mcrypt 2.x versions, or mcrypt > 2.4.x )
34. MCRYPT_TWOFISH128 (TWOFISHxxx are available in newer 2.x versions, but not in the 2.4.x versions)
35. MCRYPT_TWOFISH192
36. MCRYPT_TWOFISH256
37. MCRYPT_WAKE (libmcrypt > 2.4.x only)
38. MCRYPT_XTEA (libmcrypt > 2.4.x only).
39. MCRYPT_SERPENT_128 (libmcrypt 2.2.x only)
40. MCRYPT_SERPENT_192 (libmcrypt 2.2.x only)
41. MCRYPT_SERPENT_256 (libmcrypt 2.2.x only)