//Attempts to detect if a ciphertext was encrypted using single character xor
func SingleByteXorScore(bytestring []byte) bool {
var maxScore float64
bytes := xor.AllBytes()
for _, b := range bytes {
pt := xor.SingleCharXor(b, bytestring)
if score := PlaintextScore(pt); score > maxScore {
maxScore = score
}
}
//This value is optimized for challenge 4. Can be changed if necessary
if maxScore >= .90 {
return true
} else {
return false
}
}
func BreakSingleCharXor(ciphertext []byte) (plaintext []byte, key byte) {
bytes := xor.AllBytes()
var maxScore float64 = 0.0
for _, b := range bytes {
var potential_plaintext []byte = make([]byte, len(ciphertext))
for i, c := range ciphertext {
potential_plaintext[i] = c ^ b
}
score := PlaintextScore(potential_plaintext)
if score > maxScore {
maxScore = score
plaintext = potential_plaintext
key = b
}
}
return
}