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-rw-r--r--challenge/c22.go56
1 files changed, 56 insertions, 0 deletions
diff --git a/challenge/c22.go b/challenge/c22.go
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+// Copyright © 2021 rsiddharth <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package challenge
+
+import (
+ "fmt"
+ "time"
+
+ "ricketyspace.net/cryptopals/lib"
+)
+
+func C22() {
+ minWait := 40 * time.Second
+ maxWait := 1000 * time.Second
+ randomWait := func() {
+ fmt.Printf("Waiting for a random amount of time...\n")
+ s := time.Now()
+ lib.SleepRandom(minWait, maxWait)
+ fmt.Printf("Elapsed time %v\n", time.Now().Sub(s))
+ }
+
+ fmt.Printf("This challenge might take ~%v to ~%v to complete\n",
+ 2*minWait, 2*maxWait)
+
+ randomWait()
+ fmt.Printf("Generating seed from current time...\n")
+ lib.MTSeed(uint32(time.Now().Unix()))
+ randomWait()
+
+ fmt.Printf("Extracting first random 32-bit garbage fron RNG...\n")
+ random := lib.MTExtract()
+
+ fmt.Printf("Cracking seed...\n")
+ guess := uint32(time.Now().Unix())
+ for {
+ lib.MTSeed(guess)
+ x := lib.MTExtract()
+ if x == random {
+ fmt.Printf("Found seed %v\n", guess)
+ break
+ }
+ guess = guess - 1
+ }
+}
+
+// Output:
+// This challenge might take ~1m20s to ~33m20s to complete
+// Waiting for a random amount of time...
+// Elapsed time 10m51.671176141s
+// Generating seed from current time...
+// Waiting for a random amount of time...
+// Elapsed time 14m48.257182374s
+// Extracting first random 32-bit garbage fron RNG...
+// Cracking seed...
+// Found seed 1625112975