mcrypt_create_iv
mcrypt_ecb
Mcrypt Functions
PHP Manual

# mcrypt_decrypt

Decrypts crypttext with given parameters

### Description

string mcrypt_decrypt ( string `$cipher` , string `$key` , string `$data` , string `$mode` [, string `$iv` ] )

Decrypts the `data` and returns the unencrypted data.

### Parameters

`cipher`

  One of the `MCRYPT_ciphername` constants, or the name of the algorithm as string.

`key`

  The key with which the data was encrypted. If it's smaller than the required keysize, it is padded with '\0'.

`data`

  The data that will be decrypted with the given `cipher` and `mode`. If the size of the data is not n * blocksize, the data will be padded with '\0'.

`mode`

  One of the `MCRYPT_MODE_modename` constants, or one of the following strings: "ecb", "cbc", "cfb", "ofb", "nofb" or "stream".

`iv`

  Used for the initialization in CBC, CFB, OFB modes, and in some algorithms in STREAM mode. If you do not supply an IV, while it is needed for an algorithm, the function issues a warning and uses an IV with all its bytes set to "\0".

### Return Values

Returns the decrypted data as a string.