do collision tests

collision_test2.ts

@@ -0,0 +1,76 @@
+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 = 64
+const alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+let seen = {}
+let rawSeen = {}
+let collisions: Collision[] = []
+let counter = 0
+let failCount = 0
+const startTime = Date.now()
+
+async function main() {
+    while (true) {
+        let str = ""
+        for (let i = 0; i < len; i++) {
+            str += alphabet[Math.floor(Math.random() * (alphabet.length - 1))]
+        }
+        let h = ""
+        if (rawSeen[str] == undefined) {
+            failCount = 0
+            let hash1 = IGA.hash(str)
+            h = hash1
+            let hash2 = IGA.hash(str, 0, 32, 32, 32768)
+            if (seen[hash1] != undefined) {
+                collisions.push({
+                    hash: hash1,
+                    old: seen[hash1],
+                    new: str,
+                    randomPadding: true
+                })
+            } else {
+                seen[hash1] = str
+            }
+            if (seen[hash2] != undefined) {
+                if (!hash1.startsWith("8000")) {
+                    collisions.push({
+                        hash: hash2,
+                        old: seen[hash2],
+                        new: str,
+                        randomPadding: false
+                    })
+                }
+            } else {
+                seen[hash2] = str
+            }
+            rawSeen[str] = true
+        } else {
+            failCount++
+            if (failCount > 1000) {
+                console.log("Finding a qunique string took too long, exiting...")
+                process.exit(0)
+            }
+        }
+        if (counter % 1000 == 0) {
+            let timeTook = Math.floor((Date.now() - startTime) / 100) / 10
+            console.log(`Last string: ${str}, Last hash: ${h}, Collisions: ${collisions.length}, Time: ${timeTook}s`)
+            await sleep(1)
+        }
+        if (counter % 10000 == 0) {
+            fs.writeFileSync("collisions.json", JSON.stringify(collisions))
+        }
+        counter++
+    }
+}
+main()