MCRYPT_ENC_GET_IV_SIZE(3) 1 MCRYPT_ENC_GET_IV_SIZE(3)
mcrypt_enc_get_iv_size - Returns the size of the IV of the opened algorithm
SYNOPSIS
int mcrypt_enc_get_iv_size (resource $td)
DESCRIPTION
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
o $td
- The encryption descriptor.
RETURN VALUES
Returns the size of the IV, or 0 if the IV is ignored by the algorithm.
PHP Documentation Group MCRYPT_ENC_GET_IV_SIZE(3)
