AES-GCM decrypt a gogo

public/index.html

@@ -2,111 +2,57 @@
    <header>
       <meta charset="UTF-8">
       <script>
-         function who(form) {
-            var items = {}
-            for (var i=0; i<form.length; i++) {
-               if (form[i].name)
-                  items[form[i].name] = form[i].value
+         function b64tobuff(b64) {
+            binary = window.atob(b64)
+            return stobuff(binary)
+         }
+         function stobuff(s) {
+            bytes = new Uint8Array(s.length)
+            for (var i = 0; i < s.length; i++) {
+               bytes[i] = s.charCodeAt(i)
             }
-            var params = "?"
-            for(var k in items) {
-               params += k + "=" + items[k] + "&"
-            }
-            params = params.substr(0, params.length-1)
-            http("GET", "http://localhost:18114/who" + params, function(body, status) {
-               console.log(status, "body=",body)
-            }, null)
-            return false;
+            return bytes.buffer
          }
 
-         function http(method, remote, callback, body) {
-            var xmlhttp = new XMLHttpRequest();
-            xmlhttp.onreadystatechange = function() {
-               if (xmlhttp.readyState == XMLHttpRequest.DONE) {
-                  console.log("KK", xmlhttp.readyState, xmlhttp.responseText, xmlhttp.status)
-                  callback(xmlhttp.responseText, xmlhttp.status)
-               }
-            };
-            xmlhttp.open(method, remote, true);
-            if (typeof body == "undefined") {
-               body = null
-            }
-            xmlhttp.send(body);
-         }
-         function callback(responseBody, responseStatus) {
-         }
+         key = "123".repeat(32).substr(0, 32)
+         console.log("key:", key)
+         ciphertext = atob("SOY05yF/9iv3YG71sKkQPVaEwO53PCX8qZhDHS9JUohBgVl5Qr9/GTKK/TJ6OozhHN7QBIGmHNzQxTRRSLs4Lw==")
+         console.log("ciphertext:", ciphertext)
+         data = ciphertext.substr(12, ciphertext.length)
+         nonce = ciphertext.substr(0, 12)
+         console.log("data:", data)
+         console.log("nonce:", nonce)
 
-         function draw(one) {
-            var id = one.id
-            var meta = one.meta
-            var know = one.know
-            var html = "<div>\n"
-            html += '<h2>' + id + '</h2>\n'
-            html += '<ul>\n'
-            for(var k in meta) {
-               html += '<li>'
-               html += k + ': '
-               var lines = meta[k].split("\n")
-               if (lines.length == 1) {
-                  html += lines[0]
-               } else {
-                  html += "<ul>"
-                  lines.forEach(function(e) {
-                     html += "<li>" + e + "</li>"
-                  })
-                  html += "</ul>"
-               }
-               html += '</li>\n'
-            }
-            html += '</ul>\n'
-            html += '<h3>Knows</h3>\n'
-            html += '<ul>\n'
-            for(var k of know) {
-               html += '<li>\n'
-               var action = '\'who([{name: "id", value: "' + k.id + '"}])\''
-               html += "<a href='#' onclick=" + action + ">"
-               html += k.id + ", <i>" + k.relation + " </i>"
-               html += "</a>"
-               html += '</li>\n'
-            }
-            html += '</ul>\n'
-            html += "</div>\n"
-            document.getElementById("display").innerHTML += html
-         }
-
-         function draw_clear() {
-            document.getElementById("display").innerHTML = ""
-         }
+         key = crypto.subtle.importKey(
+            "raw",
+            stobuff(key),
+            "AES-GCM",
+            false,
+            ["decrypt"],
+         ).then(function(cryptoKey) {
+            console.log("cryptoKey:", cryptoKey)
+            window.crypto.subtle.decrypt(
+               {
+                  name: "AES-GCM",
+                  iv: stobuff(nonce),
+               },
+               cryptoKey,
+               stobuff(data),
+            ).then(function(decrypted) {
+                  console.log(decrypted)
+                  console.log(String.fromCharCode.apply(null, new Uint8Array(decrypted)))
+               })
+               .catch(function(eb){
+                  console.log("eb:",eb.code, eb.message, eb.name)
+               })
+         })
+         .catch(function(ea){console.log("ea:",ea.code, ea.message, ea.name)})
       </script>
    </header>
    <body>
-      <h1>Goodbye World</h1>
-      <form onsubmit="who(this); return false;">
-         <input name="id" type="text"/>
-         <input type="submit"/>
-      </form>
       <div id="display">
       </div>
    </body>
    <footer>
-      <script>
-         draw({
-            id: "id",
-            meta: {
-               "20200710": "hello",
-               "20200711": "world\n!",
-            },
-            know: [
-               {
-                  id: "id0",
-                  relation: ":)",
-               },
-               {
-                  id: "id1",
-                  relation: ":(",
-               },
-            ]
-         })
-      </script>
    </footer>
 </html>

view/.aes/main.go

@@ -35,6 +35,7 @@ func aesDec(key, payload string) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	log.Println(gcm.NonceSize())
 	if len(ciphertext) < gcm.NonceSize() {
 		return "", errors.New("short ciphertext")
 	}