mcrypt_generic_init
(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)
mcrypt_generic_init — This function initializes all buffers needed for encryption
This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.
Description
$td
, string $key
, string $iv
) : intYou need to call this function before every call to mcrypt_generic() or mdecrypt_generic().
Parameters
-
td -
The encryption descriptor.
-
key -
The maximum length of the key should be the one obtained by calling mcrypt_enc_get_key_size() and every value smaller than this is legal.
-
iv -
The IV should normally have the size of the algorithms block size, but you must obtain the size by calling mcrypt_enc_get_iv_size(). IV is ignored in ECB. IV MUST exist in CFB, CBC, STREAM, nOFB and OFB modes. It needs to be random and unique (but not secret). The same IV must be used for encryption/decryption. If you do not want to use it you should set it to zeros, but this is not recommended.
Return Values
The function returns a negative value on error: -3 when the key length
was incorrect, -4 when there was a memory allocation problem and any
other return value is an unknown error. If an error occurs a warning will
be displayed accordingly. FALSE is returned if incorrect parameters
were passed.
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-mcrypt-generic-init.html
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References
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