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mcrypt_module_open
Opens the module of the algorithm and the mode to be used
(PHP 4 >= 4.0.2, PHP 5)
This function opens the module of the algorithm and the mode to be used.
The name of the algorithm is specified in algorithm, e.g. "twofish" or is
one of the MCRYPT_ciphername constants. The module is closed by calling
mcrypt_module_close(). Normally it returns an
encryption descriptor, or The algorithm_directory and mode_directory are used to locate the encryption modules. When you supply a directory name, it is used. When you set one of these to the empty string (""), the value set by the mcrypt.algorithms_dir or mcrypt.modes_dir ini-directive is used. When these are not set, the default directories that are used are the ones that were compiled in into libmcrypt (usually /usr/local/lib/libmcrypt). Example 1301. mcrypt_module_open() examples<?php
The first line in the example above will try to open the DES cipher from
the default directory and the EBC mode from the directory
Example 1302. Using mcrypt_module_open() in encryption<?php See also mcrypt_module_close(), mcrypt_generic(), mdecrypt_generic(), mcrypt_generic_init(), and mcrypt_generic_deinit(). Code Examples / Notes » mcrypt_module_openmon
In the text example: $key = substr(md5('very secret key'), 0, $ks); Builds a key of $ks/2 effective bytes. 01-aug-2003 04:14
Doing a trim($decrypted) will remove the null padding that may occur as a result of decryption. The problem is if you're encrypting something like a MSWord document which can commonly end with nulls. The result $decrypted will be smaller than the original cleartext - which will then fail to open in MSOffice. To get around this, make sure you store the length of the original cleartext, and when you decrypt it, do: $decrypted = substr(mdecrypt_generic($td, $encrypted), 0, $originalLength); |
Change Languagemcrypt_cbc mcrypt_cfb mcrypt_create_iv mcrypt_decrypt mcrypt_ecb mcrypt_enc_get_algorithms_name mcrypt_enc_get_block_size mcrypt_enc_get_iv_size mcrypt_enc_get_key_size mcrypt_enc_get_modes_name mcrypt_enc_get_supported_key_sizes mcrypt_enc_is_block_algorithm_mode mcrypt_enc_is_block_algorithm mcrypt_enc_is_block_mode mcrypt_enc_self_test mcrypt_encrypt mcrypt_generic_deinit mcrypt_generic_end mcrypt_generic_init mcrypt_generic mcrypt_get_block_size mcrypt_get_cipher_name mcrypt_get_iv_size mcrypt_get_key_size mcrypt_list_algorithms mcrypt_list_modes mcrypt_module_close mcrypt_module_get_algo_block_size mcrypt_module_get_algo_key_size mcrypt_module_get_supported_key_sizes mcrypt_module_is_block_algorithm_mode mcrypt_module_is_block_algorithm mcrypt_module_is_block_mode mcrypt_module_open mcrypt_module_self_test mcrypt_ofb mdecrypt_generic |