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-rw-r--r--challenge/c06.go194
1 files changed, 96 insertions, 98 deletions
diff --git a/challenge/c06.go b/challenge/c06.go
index 025a29f..589236b 100644
--- a/challenge/c06.go
+++ b/challenge/c06.go
@@ -5,11 +5,107 @@ package challenge
import (
"fmt"
+
"ricketyspace.net/cryptopals/lib"
)
func C6() {
+ cipher := `HUIfTQsPAh9PE048GmllH0kcDk4TAQsHThsBFkU2AB4BSWQgVB0dQzNTTmVS
+BgBHVBwNRU0HBAxTEjwMHghJGgkRTxRMIRpHKwAFHUdZEQQJAGQmB1MANxYG
+DBoXQR0BUlQwXwAgEwoFR08SSAhFTmU+Fgk4RQYFCBpGB08fWXh+amI2DB0P
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+Jk8DCkkcC3hFMQIEC0EbAVIqCFZBO1IdBgZUVA4QTgUWSR4QJwwRTWM=`
bs := lib.Base64ToBytes(cipher)
+ findKey := func(block []byte) byte {
+ var k byte
+ var s int
+
+ s = 0
+ for i := byte(0); i < 255; i++ {
+ ks := lib.FillBytes(i, len(block))
+ xs := lib.FixedXORBytes(block, ks)
+
+ score := lib.AlphaPunchScore(xs)
+ if score > s {
+ s = score
+ k = i
+ }
+ }
+ return k
+ }
+ // 'bs' is the data to decrypt.
+ // 'ks' is the key size.
+ crack := func(bs []byte, ks int) (string, string) {
+ blocks := lib.BreakIntoBlocks(bs, ks)
+ blocks = lib.TransposeBlocks(blocks, ks)
+
+ key := ""
+ for i := 0; i < len(blocks); i++ {
+ k := findKey(blocks[i])
+
+ key += string(k)
+ }
+ return key, lib.RepeatingXOR(string(bs), key)
+ }
// Compute keysize.
ks := lib.KeySizeWithMinDistance(2, 40, bs)
@@ -23,39 +119,6 @@ func C6() {
fmt.Printf("Decrypted text:\n%s", text)
}
-// 'bs' is the data to decrypt.
-// 'ks' is the key size.
-func crack(bs []byte, ks int) (string, string) {
- blocks := lib.BreakIntoBlocks(bs, ks)
- blocks = lib.TransposeBlocks(blocks, ks)
-
- key := ""
- for i := 0; i < len(blocks); i++ {
- k := findKey(blocks[i])
-
- key += string(k)
- }
- return key, lib.RepeatingXOR(string(bs), key)
-}
-
-func findKey(block []byte) byte {
- var k byte
- var s int
-
- s = 0
- for i := byte(0); i < 255; i++ {
- ks := lib.FillBytes(i, len(block))
- xs := lib.FixedXORBytes(block, ks)
-
- score := lib.AlphaPunchScore(xs)
- if score > s {
- s = score
- k = i
- }
- }
- return k
-}
-
// Output:
//
// Computed key size: 29
@@ -140,68 +203,3 @@ func findKey(block []byte) byte {
// Play that funky music A little louder now
// Play that funky music, white boy Come on, Come on, Come on
// Play that funky music
-
-var cipher string = `HUIfTQsPAh9PE048GmllH0kcDk4TAQsHThsBFkU2AB4BSWQgVB0dQzNTTmVS
-BgBHVBwNRU0HBAxTEjwMHghJGgkRTxRMIRpHKwAFHUdZEQQJAGQmB1MANxYG
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