73 lines
1.2 KiB
Lua
73 lines
1.2 KiB
Lua
-- Copyright (C) by Yichun Zhang (agentzh)
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local ffi = require "ffi"
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local ffi_new = ffi.new
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local ffi_str = ffi.string
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local C = ffi.C
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local setmetatable = setmetatable
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--local error = error
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local _M = { _VERSION = '0.14' }
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local mt = { __index = _M }
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ffi.cdef[[
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typedef unsigned long MD5_LONG ;
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enum {
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MD5_CBLOCK = 64,
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MD5_LBLOCK = MD5_CBLOCK/4
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};
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typedef struct MD5state_st
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{
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MD5_LONG A,B,C,D;
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MD5_LONG Nl,Nh;
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MD5_LONG data[MD5_LBLOCK];
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unsigned int num;
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} MD5_CTX;
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int MD5_Init(MD5_CTX *c);
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int MD5_Update(MD5_CTX *c, const void *data, size_t len);
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int MD5_Final(unsigned char *md, MD5_CTX *c);
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]]
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local buf = ffi_new("char[16]")
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local ctx_ptr_type = ffi.typeof("MD5_CTX[1]")
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function _M.new(self)
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local ctx = ffi_new(ctx_ptr_type)
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if C.MD5_Init(ctx) == 0 then
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return nil
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end
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return setmetatable({ _ctx = ctx }, mt)
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end
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function _M.update(self, s)
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return C.MD5_Update(self._ctx, s, #s) == 1
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end
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function _M.final(self)
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if C.MD5_Final(buf, self._ctx) == 1 then
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return ffi_str(buf, 16)
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end
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return nil
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end
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function _M.reset(self)
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return C.MD5_Init(self._ctx) == 1
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end
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return _M
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