mcrypt_enc_get_key_size – Returns the Maximum Supported Key Size for an Opened Encryption Mode
The PHP function mcrypt_enc_get_key_size returns the maximum key length, in bytes, that the currently opened encryption mode can support, taking a resource descriptor as its sole parameter and providing developers with essential information for handling encryption keys securely.
The PHP function int mcrypt_enc_get_key_size(resource $td) returns the maximum key size, in bytes, that the opened encryption mode can support.
Parameter
td
Encryption descriptor resource.
Return value
Maximum supported key length in bytes.
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