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PHP mcrypt_enc_get_iv_size

PHP original manual for mcrypt_enc_get_iv_size [ show | php.net ]

mcrypt_enc_get_iv_size

(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)

mcrypt_enc_get_iv_size — Returns the size of the IV of the opened algorithm

Warning

This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.

Description

int mcrypt_enc_get_iv_size ( resource $td )

This function returns the size of the IV of the algorithm specified by the encryption descriptor in bytes. An IV is used in cbc, cfb and ofb modes, and in some algorithms in stream mode.

Parameters

td

The encryption descriptor.

Return Values

Returns the size of the IV, or 0 if the IV is ignored by the algorithm.