PHP使用自定义key实现对数据加密解密

// 加密function encryptStr($str, $key){ ?$block = mcrypt_get_block_size(‘des‘, ‘ecb‘); ?$pad = $block - (strlen($str) % $block); ?$str .= str_repeat(chr($pad), $pad); ?$enc_str = mcrypt_encrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB); ?return base64_encode($enc_str);}// 解密function decryptStr($str, $key){ ?$str = base64_decode($str); ?$str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB); ?$block = mcrypt_get_block_size(‘des‘, ‘ecb‘); ?$pad = ord($str[($len = strlen($str)) - 1]); ?return substr($str, 0, strlen($str) - $pad);}