hi,
没有搞的很通用，先帮忙看看有啥问题没，有加密需要的也可以参考下改改。
local ffi = require 'ffi'
local ffi_new = ffi.new
local ffi_str = ffi.string
local ffi_copy = ffi.copy
local setmetatable = setmetatable
local _M = { }
local mt = { __index = _M }
ffi.cdef[[
struct CRYPT_STREAM;
typedef struct CRYPT_STREAM *MCRYPT;
MCRYPT mcrypt_module_open(char *algorithm,
char *a_directory, char *mode,
char *m_directory);
int mcrypt_generic_init(const MCRYPT td, void *key, int lenofkey,
void *IV);
int mcrypt_generic_deinit(const MCRYPT td);
int mcrypt_generic_end(const MCRYPT td);
int mdecrypt_generic(MCRYPT td, void *plaintext, int len);
int mcrypt_generic(MCRYPT td, void *plaintext, int len);
int mcrypt_module_close(MCRYPT td);
]]
local mcrypt = ffi.load('libmcrypt.so.4')
_M.new = function (self)
local cipher = 'blowfish'
local mode = 'cbc'
local c_cipher = ffi_new("char[9]", cipher)
local c_mode = ffi_new("char[4]", mode)
local td = mcrypt.mcrypt_module_open(c_cipher, nil, c_mode, nil)
return setmetatable( { _td = td }, mt )
end
_M.encrypt = function(self, key, raw)
local iv_len = 8
local td = self._td
local c_key = ffi_new("char[?]", #key+1, key)
local c_iv = ffi_new("char[9]", key)
local c_raw = ffi_new("char[?]", #raw+1, raw)
mcrypt.mcrypt_generic_init(td, c_key, #key, c_iv)
mcrypt.mcrypt_generic(td, c_raw, #raw )
mcrypt.mcrypt_generic_deinit(td)
return ffi_str(c_raw, ffi.sizeof(c_raw)-1)
end
_M.decrypt = function(self, key, raw)
local iv_len = 8
local td = self._td
local c_key = ffi_new("char[?]", #key+1, key)
local c_iv = ffi_new("char[9]", key)
local c_raw = ffi_new("char[?]", #raw+1, raw)
mcrypt.mcrypt_generic_init(td, c_key, #key, c_iv)
mcrypt.mdecrypt_generic(td, c_raw, #raw )
mcrypt.mcrypt_generic_deinit(td)
return ffi_str(c_raw, ffi.sizeof(c_raw)-1)
end
_M.close = function(self)
local td = self._td
if td then
mcrypt.mcrypt_module_close(td)
end
end
return _M
