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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.
0 According the PHP Documentation : mcrypt_get_iv_size is deprecated as of PHP 7.1.0 Link to PHP mcrypt_get_iv_size You should use mcrypt_enc_get_iv_size in PHP later than 7.1.0 Link to PHP mcrypt_enc_get_iv_size answered Nov 18, 2017 at 20:26 user8828810
This function returns the size of the iv of the algorithm specified by the encryption descriptor in bytes. If it returns '0' then the IV is ignored in the algorithm. An IV is used in cbc, cfb and ofb modes, and in some algorithms in stream mode. Prev Home Next mcrypt_enc_get_supported_key_sizes Up mcrypt_enc_get_algorithms_name
mcrypt_get_iv_size — Returns the size of the IV belonging to a specific cipher/mode combination mcrypt_get_key_size — Gets the key size of the specified cipher mcrypt_list_algorithms — Gets an array of all supported ciphers mcrypt_list_modes — Gets an array of all supported modes mcrypt_module_close — Closes the mcrypt module
mcrypt_get_iv_size () retourne la taille du vecteur d'initialisation (VI). Si l'algorithme n'utilise pas de vecteur d'initialisation, zéro est retourné. Il est plus utile d'utiliser la fonction mcrypt_enc_get_iv_size (), car elle utilise la ressource retournée par mcrypt_module_open ().
This function returns the size of the iv of the algorithm specified by the encryption descriptor in bytes. If it returns '0' then the IV is ignored in the algorithm. An IV is used in cbc, cfb and ofb modes, and in some algorithms in stream mode. mcrypt_enc_get_block_size mcrypt_enc_get_key_size Last updated: Tue, 19 Sep 2006
You will need to have the same IV (think: starting point) both at encryption and decryption stages, otherwise your encryption will fail. It is more useful to use the mcrypt_enc_get_iv_size () function as this uses the resource returned by mcrypt_module_open ().
