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# mcrypt_enc_get_key_size

(PHP 4 >= 4.0.2)

mcrypt_enc_get_key_size -- Returns the maximum supported keysize of the opened mode

## Description

``int mcrypt_enc_get_key_size` (resource td)`

This function returns the maximum supported key size of the algorithm specified by the encryption descriptor td in bytes.

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mcrypt_enc_get_block_size | Up | mcrypt_enc_get_supported_key_sizes