mcrypt_module_is_block_algorithm_mode(3) [php man page]
MCRYPT_MODULE_IS_BLOCK_ALGORITHM_MODE(3) 1 MCRYPT_MODULE_IS_BLOCK_ALGORITHM_MODE(3)mcrypt_module_is_block_algorithm_mode - Returns if the specified module is a block algorithm or notSYNOPSIS
bool mcrypt_module_is_block_algorithm_mode (string $mode, [string $lib_dir])
DESCRIPTION
This function returns TRUE if the mode is for use with block algorithms, otherwise it returns FALSE. (e.g. FALSE for stream, and TRUE for
cbc, cfb, ofb).
PARAMETERS
o $mode
- The mode to check.
o $lib_dir
- The optional $lib_dir parameter can contain the location where the algorithm module is on the system.
RETURN VALUES
This function returns TRUE if the mode is for use with block algorithms, otherwise it returns FALSE. (e.g. FALSE for stream, and TRUE for
cbc, cfb, ofb).
PHP Documentation Group MCRYPT_MODULE_IS_BLOCK_ALGORITHM_MODE(3)
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MCRYPT_GET_IV_SIZE(3) 1 MCRYPT_GET_IV_SIZE(3)mcrypt_get_iv_size - Returns the size of the IV belonging to a specific cipher/mode combination
SYNOPSIS
int mcrypt_get_iv_size (string $cipher, string $mode)
DESCRIPTION
Gets the size of the IV belonging to a specific $cipher/$mode combination.
It is more useful to use the mcrypt_enc_get_iv_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". The
IV is ignored in ECB mode as this mode does not require it. You will need to have the same IV (think: starting point) both at
encryption and decryption stages, otherwise your encryption will fail.
RETURN VALUES
Returns the size of the Initialization Vector (IV) in bytes. On error the function returns FALSE. If the IV is ignored in the specified
cipher/mode combination zero is returned.
EXAMPLES
Example #1
mcrypt_get_iv_size(3) Example
<?php
echo mcrypt_get_iv_size(MCRYPT_CAST_256, MCRYPT_MODE_CFB) . "
";
echo mcrypt_get_iv_size('des', 'ecb') . "
";
?>
SEE ALSO mcrypt_get_block_size(3), mcrypt_enc_get_iv_size(3), mcrypt_create_iv(3).
PHP Documentation Group MCRYPT_GET_IV_SIZE(3)
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