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the iv parameter is used for the initialisation in cbc, cfb, ofb modes, and in some algorithms in stream mode.
data is the data that will be encrypted with the given cipher and mode. if the size of the data is not n * blocksize, the data will be padded with '\0'. the returned crypttext can be larger that the size of the data that is given by data.
mode is one of the mcrypt_mode_modename constants of one of "ecb", "cbc", "cfb", "ofb", "nofb" or "stream ".
mode is one of the mcrypt_mode_modename constants of one of "ecb", "cbc", "cfb", "ofb", "nofb" or "stream".