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// Copyright © 2021 siddharth ravikumar <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package lib
// Both 'a' and 'b' must be hex encoded string.
func FixedXOR(a, b string) string {
cs := ""
if len(a) != len(b) {
return cs
}
ab := []byte(a)
bb := []byte(b)
for i := 0; i < len(ab); i++ {
p := HexCharToDec(ab[i])
q := HexCharToDec(bb[i])
r := DecToHexChar(p ^ q)
cs += string(r)
}
return cs
}
func FixedXORBytes(as, bs []byte) []byte {
if len(as) != len(bs) {
return make([]byte, 0)
}
cs := make([]byte, len(as))
for i := 0; i < len(as); i++ {
cs[i] = as[i] ^ bs[i]
}
return cs
}
// Both 'data' and 'key' need to be plain ascii string.
func RepeatingXOR(data, key []byte) []byte {
xs := make([]byte, 0)
if len(data) < 1 || len(key) < 1 {
return xs
}
lk := len(key)
for i, ki := 0, 0; i < len(data); i++ {
if ki == lk {
ki = 0
}
// xor a byte
eb := data[i] ^ key[ki]
// append to result
xs = append(xs, eb)
ki += 1
}
return xs
}
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