mcrypt_decrypt Decrypts crypttext with given parameters


mcrypt_decrypt

(PHP 4 >= 4.0.2, PHP 5)

mcrypt_decryptDecrypts crypttext with given parameters

说明

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

Decrypts the data and returns the unencrypted data.

参数

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 ''.

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 ''.

mode

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

iv

The iv parameter is 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 ''.

返回值

Returns the decrypted data as a string.


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