/
util.go
64 lines (55 loc) · 1.28 KB
/
util.go
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package util
import (
"io/ioutil"
"math"
"net/http"
)
const RUNES = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz123456789~!@#$%^&*()_+`-={}|[]\\,./<>?:\";' "
type CryptopalsResult struct {
Key []rune
Score int
EncryptedString string
DecryptedString string
}
type KeySizeHammingDistance struct {
KeySize int
HammingDistance float64
}
func NextByteOfRepeatingKey(key []byte) func() byte {
var pos int
return func() byte {
endPos := len(key) - 1
curPos := pos
if curPos == endPos {
pos = 0
} else {
pos++
}
return key[curPos]
}
}
func GetCryptopalsData(url string) string {
response, err := http.Get(url)
if err != nil {
panic(err)
}
defer response.Body.Close()
responseData, err := ioutil.ReadAll(response.Body)
if err != nil {
panic(err)
}
responseString := string(responseData)
return responseString
}
func Transpose(bytes []byte, length int) [][]byte {
dy := int(math.Ceil(float64(len(bytes)) / float64(length)))
//fmt.Println("dy: ", dy)
transposedBytes := make([][]byte, dy)
for i := range transposedBytes {
for j := 0; j < length && i*length+j < len(bytes); j++ {
//fmt.Println(i, " ", j, " ", i*length+j)
transposedBytes[i] = append(transposedBytes[i], bytes[i+j*length])
}
}
return transposedBytes
}