Created
March 31, 2019 07:06
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package main | |
import ( | |
"encoding/hex" | |
) | |
func main() { | |
cipherTextHex := "09e1c5f70a65ac519458e7e53f36" | |
plaintext := "attack at dawn" | |
newPlainText := "attack at dusk" | |
p := []byte(plaintext) | |
c, _ := hex.DecodeString(cipherTextHex) | |
key := crack(p, c) | |
p2 := []byte(newPlainText) | |
c2 := enc(p2, key) | |
println(hex.EncodeToString(c2)) | |
} | |
func enc(plaintext []byte, key []byte) []byte { | |
cipherText := xorBytes([]byte(plaintext), key) | |
return cipherText | |
} | |
func crack(plaintext []byte, cipherText []byte) []byte { | |
key := xorBytes(plaintext, cipherText) | |
return key | |
} | |
func xorBytes(b1 []byte, b2 []byte) []byte { | |
r := make([]byte, len(b1)) | |
for i := 0; i < len(b1); i++ { | |
r[i] = b1[i] ^ b2[i] | |
} | |
return r | |
} |
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