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// Copyright © 2021 siddharth <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package challenge
import (
"fmt"
"time"
"ricketyspace.net/cryptopals/lib"
)
func C22() {
mt := new(lib.MTRand)
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")
mt.Seed(uint32(time.Now().Unix()))
randomWait()
fmt.Printf("Extracting first random 32-bit garbage fron RNG...\n")
random := mt.Extract()
fmt.Printf("Cracking seed...\n")
guess := uint32(time.Now().Unix())
for {
mt.Seed(guess)
x := mt.Extract()
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
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