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-- Copyright (C) by Yichun Zhang (agentzh)
require "resty.sha"
local ffi = require "ffi"
local ffi_new = ffi.new
local ffi_str = ffi.string
local C = ffi.C
local setmetatable = setmetatable
--local error = error
local _M = { _VERSION = '0.14' }
local mt = { __index = _M }
ffi.cdef[[
typedef struct SHA256state_st
{
SHA_LONG h[8];
SHA_LONG Nl,Nh;
SHA_LONG data[SHA_LBLOCK];
unsigned int num,md_len;
} SHA256_CTX;
int SHA256_Init(SHA256_CTX *c);
int SHA256_Update(SHA256_CTX *c, const void *data, size_t len);
int SHA256_Final(unsigned char *md, SHA256_CTX *c);
]]
local digest_len = 32
local buf = ffi_new("char[?]", digest_len)
local ctx_ptr_type = ffi.typeof("SHA256_CTX[1]")
function _M.new(self)
local ctx = ffi_new(ctx_ptr_type)
if C.SHA256_Init(ctx) == 0 then
return nil
end
return setmetatable({ _ctx = ctx }, mt)
end
function _M.update(self, s)
return C.SHA256_Update(self._ctx, s, #s) == 1
end
function _M.final(self)
if C.SHA256_Final(buf, self._ctx) == 1 then
return ffi_str(buf, digest_len)
end
return nil
end
function _M.reset(self)
return C.SHA256_Init(self._ctx) == 1
end
return _M