do collision tests

collision_test1.ts

@@ -0,0 +1,93 @@
+import IGA from './IGA';
+import fs from 'fs';
+
+type Collision = {
+    hash: string,
+    old: string,
+    new: string,
+    randomPadding: boolean
+}
+function sleep(ms: number): Promise<void> {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+const len = 4
+let state = ["a"]
+const alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+let seen = {}
+let counter = 0
+let collisions: Collision[] = []
+const startTime = Date.now()
+
+async function bruteForce(pos) {
+    while (true) {
+        if (pos != state.length - 1) {
+            await bruteForce(pos + 1)
+        }
+        if (pos == state.length - 1) {
+            let hash1 = IGA.hash(state.join(""))
+            let hash2 = IGA.hash(state.join(""), 0, 32, 32, 32768)
+            if (seen[hash1] != undefined) {
+                collisions.push({
+                    hash: hash1,
+                    old: seen[hash1],
+                    new: state.join(""),
+                    randomPadding: true
+                })
+            } else {
+                seen[hash1] = state.join("")
+            }
+            if (seen[hash2] != undefined) {
+                if (!hash1.startsWith("8000")) {
+                    collisions.push({
+                        hash: hash2,
+                        old: seen[hash2],
+                        new: state.join(""),
+                        randomPadding: false
+                    })
+                }
+            } else {
+                seen[hash2] = state.join("")
+            }
+            if (counter % 1000 == 0) {
+                let timeTook = Math.floor((Date.now() - startTime) / 100)/10
+                let etaPart = 0
+                for (let ln = 1; ln <= len; ln++) {
+                    etaPart += Math.pow(alphabet.length, ln)
+                }
+                let eta = Math.max(0, Math.floor((etaPart - counter) * (timeTook / counter) * 10) / 10)
+                console.log("Current state: " + state.join("") + ", Last hash: " + hash1 + ", Collisions: " + collisions.length + ", Time: " + timeTook + "s, ETA: " + eta + "s");
+                await sleep(1)
+            }
+            if (counter % 10000 == 0) {
+                fs.writeFileSync("collisions.json", JSON.stringify(collisions))
+            }
+            counter++
+        }
+        let currentChar = alphabet.indexOf(state[pos])
+        if (currentChar == alphabet.length - 1) {
+            for (let i = pos; i < state.length; i++) {
+                state[i] = "a"
+            }
+            break
+        }
+        state[pos] = alphabet[currentChar + 1]
+    }
+    if (pos == 0 && state.length < len) {
+        for (let i = 0; i < state.length; i++) {
+            state[i] = "a"
+        }
+        state.push("a")
+        await bruteForce(0)
+    }
+}
+
+async function main() {
+    await bruteForce(0)
+
+    let tT = Math.floor((Date.now() - startTime) / 100)/10
+    console.log("Done! Took " + tT + "s, Checked " + counter + " hashes, Collisions: " + collisions.length);
+    console.log(collisions);
+    fs.writeFileSync("collisions.json", JSON.stringify(collisions))
+}
+main()