summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorsiddharth <s@ricketyspace.net>2021-06-19 10:04:46 -0400
committersiddharth <s@ricketyspace.net>2021-06-19 10:04:46 -0400
commite285c8aa4a03b4f96b1ab36a0fd4b1a6e810ec4b (patch)
treec9460c85466548a44855ab0af79de688132518c1
parent03346243733759bf44ba0bf51a2af4766490c277 (diff)
lib: update RepeatingXOR
- Change input type to []byte. - Change retur type to []byte. - Update RepeatingXOR calls in challenge 5 an 6.
-rw-r--r--challenge/c05.go12
-rw-r--r--challenge/c06.go8
-rw-r--r--lib/xor.go16
3 files changed, 15 insertions, 21 deletions
diff --git a/challenge/c05.go b/challenge/c05.go
index a9b1682..a1413ef 100644
--- a/challenge/c05.go
+++ b/challenge/c05.go
@@ -10,12 +10,12 @@ import (
)
func C5() {
- icebaby := `Burning 'em, if you ain't quick and nimble
-I go crazy when I hear a cymbal`
- key := "ICE"
- es := lib.RepeatingXOR(icebaby, key)
- hs := lib.AsciiStrToHexStr(es)
- fmt.Printf("RepeatingXOR('%v', '%v') = %v\n", icebaby, key, hs)
+ icebaby := lib.StrToBytes(`Burning 'em, if you ain't quick and nimble
+I go crazy when I hear a cymbal`)
+ key := lib.StrToBytes("ICE")
+ eb := lib.RepeatingXOR(icebaby, key)
+ hs := lib.AsciiStrToHexStr(lib.BytesToStr(eb))
+ fmt.Printf("RepeatingXOR('%s', '%s') = %v\n", icebaby, key, hs)
}
// Output:
diff --git a/challenge/c06.go b/challenge/c06.go
index 589236b..5d19146 100644
--- a/challenge/c06.go
+++ b/challenge/c06.go
@@ -94,17 +94,17 @@ Jk8DCkkcC3hFMQIEC0EbAVIqCFZBO1IdBgZUVA4QTgUWSR4QJwwRTWM=`
}
// 'bs' is the data to decrypt.
// 'ks' is the key size.
- crack := func(bs []byte, ks int) (string, string) {
+ crack := func(bs []byte, ks int) ([]byte, []byte) {
blocks := lib.BreakIntoBlocks(bs, ks)
blocks = lib.TransposeBlocks(blocks, ks)
- key := ""
+ key := make([]byte, 0)
for i := 0; i < len(blocks); i++ {
k := findKey(blocks[i])
- key += string(k)
+ key = append(key, k)
}
- return key, lib.RepeatingXOR(string(bs), key)
+ return key, lib.RepeatingXOR(bs, key)
}
// Compute keysize.
diff --git a/lib/xor.go b/lib/xor.go
index 7b57d82..31a4b8b 100644
--- a/lib/xor.go
+++ b/lib/xor.go
@@ -35,29 +35,23 @@ func FixedXORBytes(as, bs []byte) []byte {
}
// Both 'data' and 'key' need to be plain ascii string.
-func RepeatingXOR(data, key string) string {
- xs := ""
+func RepeatingXOR(data, key []byte) []byte {
+ xs := make([]byte, 0)
if len(data) < 1 || len(key) < 1 {
return xs
}
- // data in bytes
- db := []byte(data)
-
- // key in bytes
- dk := []byte(key)
-
lk := len(key)
- for i, ki := 0, 0; i < len(db); i++ {
+ for i, ki := 0, 0; i < len(data); i++ {
if ki == lk {
ki = 0
}
// xor a byte
- eb := db[i] ^ dk[ki]
+ eb := data[i] ^ key[ki]
// append to result
- xs += string(eb)
+ xs = append(xs, eb)
ki += 1
}