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authorsiddharth <s@ricketyspace.net>2021-09-04 19:01:21 -0400
committersiddharth <s@ricketyspace.net>2021-09-04 19:01:21 -0400
commit428baa6d91ea28ebc942c390b041f4be925be616 (patch)
treefa230b3514b94d07bdd1ef2a36713bd3bbc39163 /challenge/c24.go
parenta8901ea04d835a32fdbcee8e4acc0f884a3f6782 (diff)
challenge: C24: implement part 2
Diffstat (limited to 'challenge/c24.go')
-rw-r--r--challenge/c24.go21
1 files changed, 21 insertions, 0 deletions
diff --git a/challenge/c24.go b/challenge/c24.go
index d60036b..a2d4a20 100644
--- a/challenge/c24.go
+++ b/challenge/c24.go
@@ -5,6 +5,7 @@ package challenge
import (
"fmt"
+ "time"
"ricketyspace.net/cryptopals/lib"
)
@@ -44,7 +45,27 @@ func C24() {
panic(fmt.Errorf("Unable to crack 16-bit seed %v != %v\n", cseed, seed))
}
fmt.Printf("Cracked 16-bit seed %v == %v\n", cseed, seed)
+
+ // Part II: Check if password token is generated using MT19937
+ // seeded with current time.
+ tseed := uint32(time.Now().Unix() - lib.RandomInt(60, 86400))
+ token := lib.MTToken(tseed, 32)
+ guess := uint32(time.Now().Unix())
+ for guess > uint32(time.Now().Unix())-86400 { // Go back 24 hours.
+ if token == lib.MTToken(guess, len(token)/2) {
+ fmt.Printf("Token generated using MT19937 seeded"+
+ " with current time\n\tSeed: %v\n\tToken: %v\n",
+ guess, token)
+ return
+ }
+ guess -= 1
+ }
+ fmt.Printf("Token not generated using MT19937 seeded with current time\n")
+
}
// Output:
// Cracked 16-bit seed [74 8] == [74 8]
+// Token generated using MT19937 seeded with current time
+// Seed: 1630730057
+// Token: 4b8dc62151d85802b7ce731b6b7b9a6e299740721a5555ed1f54eb9bc304a8b2