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# mcrypt_cfb

(3.0.8 - 3.0.18 only, PHP 4 >= 4.0.0)

mcrypt_cfb -- Encrypt/decrypt data in CFB mode

## Description

``string mcrypt_cfb` (int cipher, string key, string data, int mode, string iv)`

``string mcrypt_cfb` (string cipher, string key, string data, int mode [, string iv])`

The first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x.

mcrypt_cfb() encrypts or decrypts (depending on `mode`) the `data` with `cipher` and `key` in CFB cipher mode and returns the resulting string.

`Cipher` is one of the MCRYPT_ciphername constants.

`Key` is the key supplied to the algorithm. It must be kept secret.

`Data` is the data which shall be encrypted/decrypted.

`Mode` is MCRYPT_ENCRYPT or MCRYPT_DECRYPT.

`IV` is the initialization vector.

See also: mcrypt_cbc(), mcrypt_ecb(), and mcrypt_ofb().

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