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Digg  mcrypt_decrypt
Decrypts crypttext with given parameters
(PHP 4 >= 4.0.2, PHP 5)
Code Examples / Notes » mcrypt_decryptsmp_info
Since the returned data seems to be still padded with extra characters, you can get *only* the original data that was encrypted by str_replace()'ing the \x0 characters. <?php $decryptedData = str_replace("\x0", '', $encryptedData); ?> eddiec
It appears that mcrypt_decrypt pads the *RETURN STRING* with nulls ('\0') to fill out to n * blocksize. For old C-programmers, like myself, it is easy to believe the string ends at the first null. In PHP it does not: strlen("abc\0\0") returns 5 and *NOT* 3 strcmp("abc", "abc\0\0") returns -2 and *NOT* 0 I learned this lesson painfully when I passed a string returned from mycrypt_decrypt into a NuSoap message, which happily passed the nulls along to the receiver, who couldn't figure out what I was talking about. My solution was: <? $retval = mcrypt_decrypt( ...etc ...); $retval = rtrim($retval, "\0"); // trim ONLY the nulls at the END ?> kooktroop
Following on from the mcrypt_encrypt() example: <?php $text = "boggles the inivisble monkey will rule the world"; $key = "This is a very secret key"; $iv_size = mcrypt_get_iv_size(MCRYPT_XTEA, MCRYPT_MODE_ECB); $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); echo strlen($text) . " "; $enc = mcrypt_encrypt(MCRYPT_XTEA, $key, $text, MCRYPT_MODE_ECB, $iv); echo strlen($enc) . " "; $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); $key = "This is a very secret key"; $text = "Meet me at 11 o'clock behind the monument."; echo strlen($text) . " "; $crypttext = mcrypt_decrypt(MCRYPT_XTEA, $key, $enc, MCRYPT_MODE_ECB, $iv); echo "$crypttext "; ?> |
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mcrypt_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 |
