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 algorithmSYNOPSIS
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)
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MCRYPT_GET_BLOCK_SIZE(3) 1 MCRYPT_GET_BLOCK_SIZE(3)mcrypt_get_block_size - Gets the block size of the specified cipherSYNOPSIS
int mcrypt_get_block_size (int $cipher)
DESCRIPTION
int mcrypt_get_block_size (string $cipher, string $mode)
The first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x or 2.5.x.
mcrypt_get_block_size(3) is used to get the size of a block of the specified $cipher (in combination with an encryption mode).
It is more useful to use the mcrypt_enc_get_block_size(3) function as this uses the resource returned by mcrypt_module_open(3).
PARAMETERS
o $cipher
-One of the MCRYPT_ciphername constants, or the name of the algorithm as string.
o $mode
-One of the MCRYPT_MODE_modename constants, or one of the following strings: "ecb", "cbc", "cfb", "ofb", "nofb" or "stream".
RETURN VALUES
Gets the block size, as an integer.
EXAMPLES
Example #1
mcrypt_get_block_size(3) example
This example shows how to use this function when linked against libmcrypt 2.4.x and 2.5.x.
<?php
echo mcrypt_get_block_size('tripledes', 'ecb'); // 8
?>
SEE ALSO mcrypt_get_key_size(3), mcrypt_enc_get_block_size(3), mcrypt_encrypt(3).
PHP Documentation Group MCRYPT_GET_BLOCK_SIZE(3)
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