mdecrypt_generic

mdecrypt_generic

(PHP 4 >= 4.0.2, PHP 5)

mdecrypt_genericDecrypts data

说明

string mdecrypt_generic ( resource $td , string $data )

This function decrypts data. Note that the length of the returned string can in fact be longer than the unencrypted string, due to the padding of the data.

参数

td

An encryption descriptor returned by mcrypt_module_open()

data

Encrypted data.

范例

Example #1 mdecrypt_generic() Example

<?php
    

    
$key 'this is a very long key, even too long for the cipher';
    
$plain_text 'very important data';

    

    
$td mcrypt_module_open('des''''ecb''');
    
$key substr($key0mcrypt_enc_get_key_size($td));
    
$iv_size mcrypt_enc_get_iv_size($td);
    
$iv mcrypt_create_iv($iv_sizeMCRYPT_RAND);

    

    
if (mcrypt_generic_init($td$key$iv) != -1) {

        

        
$c_t mcrypt_generic($td$plain_text);
        
mcrypt_generic_deinit($td);

        

        
mcrypt_generic_init($td$key$iv);
        
$p_t mdecrypt_generic($td$c_t);

        

        
mcrypt_generic_deinit($td);
        
mcrypt_module_close($td);
    }

    if (
strncmp($p_t$plain_textstrlen($plain_text)) == 0) {
        echo 
"ok ";
    } else {
        echo 
"error ";
    }
?>

The example above shows how to check if the data before the encryption is the same as the data after the decryption. It is very important to reinitialize the encryption buffer with mcrypt_generic_init() before you try to decrypt the data.

The decryption handle should always be initialized with mcrypt_generic_init() with a key and an IV before calling this function. Where the encryption is done, you should free the encryption buffers by calling mcrypt_generic_deinit(). See mcrypt_module_open() for an example.

参见


  • mcrypt_cbc
  • mcrypt_cfb
  • mcrypt_create_iv
  • mcrypt_decrypt
  • mcrypt_ecb
  • mcrypt_encrypt
  • 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
  • mcrypt_enc_is_block_algorithm_mode
  • mcrypt_enc_is_block_mode
  • mcrypt_enc_self_test
  • mcrypt_generic
  • mcrypt_generic_deinit
  • mcrypt_generic_end
  • mcrypt_generic_init
  • 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
  • mcrypt_module_is_block_algorithm_mode
  • mcrypt_module_is_block_mode
  • mcrypt_module_open
  • mcrypt_module_self_test
  • mcrypt_ofb
  • mdecrypt_generic
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