增加sql的waf功能

resty/sha384.lua

@@ -0,0 +1,60 @@
+-- Copyright (C) by Yichun Zhang (agentzh)
+
+
+require "resty.sha512"
+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[[
+int SHA384_Init(SHA512_CTX *c);
+int SHA384_Update(SHA512_CTX *c, const void *data, size_t len);
+int SHA384_Final(unsigned char *md, SHA512_CTX *c);
+]]
+
+local digest_len = 48
+
+local buf = ffi_new("char[?]", digest_len)
+local ctx_ptr_type = ffi.typeof("SHA512_CTX[1]")
+
+
+function _M.new(self)
+    local ctx = ffi_new(ctx_ptr_type)
+    if C.SHA384_Init(ctx) == 0 then
+        return nil
+    end
+
+    return setmetatable({ _ctx = ctx }, mt)
+end
+
+
+function _M.update(self, s)
+    return C.SHA384_Update(self._ctx, s, #s) == 1
+end
+
+
+function _M.final(self)
+    if C.SHA384_Final(buf, self._ctx) == 1 then
+        return ffi_str(buf, digest_len)
+    end
+
+    return nil
+end
+
+
+function _M.reset(self)
+    return C.SHA384_Init(self._ctx) == 1
+end
+
+return _M
+