Free Online Tutorials

Openresty: AES encrypt and decrypt

		location ~ /api/aes {
             
			set $string $http_string;
			set $encoded $http_encoded;
			
			add_header 'Content-Type' 'text/plain';
			
			content_by_lua_block {
				local aes = require "resty.aes"
					local str = require "resty.string"
					local aes_128_cbc_with_iv = aes:new("1234567890123456",
						nil, aes.cipher(128,"cbc"), {iv="1234567890123456"})	
				
				local function GET(value)
					local args = ngx.req.get_uri_args()					
					local v = nil
					for key, val in pairs(args) do
						if key == value then
							if type(val) == "table" then
								v = table.concat(val, ", ")
							else
								v = val
							end
							break
						end
					end
					return v
				end
				
				local function convertAscii(value)
					return value:gsub("(..)",function(c)return c.char(tonumber(c,16))end)
				end
				
				local function all_trim(s)
				   return s:match( "^%s*(.-)%s*$" )
				end
				
				local string = GET("string")
				local encoded = GET("encoded")
				
				if string == nil then
					string = ngx.var.string
				end
				
				if encoded == nil then
					encoded = ngx.var.encoded
				end
				
				if string ~= "" then									  	 					
				 	local encrypted = aes_128_cbc_with_iv:encrypt(all_trim(string))	
				 	ngx.say( str.to_hex(encrypted) )				 
				elseif encoded ~= "" then									  	 					
					local encrypted = aes_128_cbc_with_iv:decrypt(convertAscii(encoded))
					ngx.say( all_trim(encrypted) )
				end
			}
			   
        }

Demo encrypt: http://162.250.190.40/api/aes?string=123456
CURL:

curl -sk --url http://162.250.190.40/api/aes --header "string: 123456" 

Result: d637735ae9e21ba50cb686b74fab8d2c

Demo decrypt: http://162.250.190.40/api/aes?encoded=d637735ae9e21ba50cb686b74fab8d2c
CURL:

curl -sk --url http://162.250.190.40/api/aes --header "encoded: d637735ae9e21ba50cb686b74fab8d2c" 

Result: 123456