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package main
import (
"encoding/base64"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"fmt"
"io"
"os"
//"strconv"
)
func cryptexample() {
fmt.Println("Testing Cryptics")
//key := "123456789012345678901234" // Needs to be 32 bytes long
//key := "Have some of the beautiful ideas"
plaintext1 := "Hello! You Fool! I Love You"
plaintext2 := "Somefancy Password"
foo := Encrypt(plaintext1)
fook := Decrypt(foo)
fmt.Printf("%s -> %s\n",plaintext1,foo)
fmt.Printf("%s -> %s\n\n",foo,fook)
bar := Encrypt(plaintext2)
barn := Decrypt(bar)
fmt.Printf("%s -> %s\n",plaintext2,bar)
fmt.Printf("%s -> %s\n\n",bar,barn)
os.Exit(0)
}
//key := "123456789012345678901234" // Needs to be 32 bytes long
var keystr string = "Have some of the beautiful ideas"
func encodeBase64(inp string) string {
b := []byte(inp)
return base64.StdEncoding.EncodeToString(b)
}
func decodeBase64(s string) string {
data, err := base64.StdEncoding.DecodeString(s)
if err != nil { panic(err) }
return string(data)
}
func Encrypt(textstr string) string {
text := []byte(textstr)
key := []byte(keystr)
//fmt.Println(text)
block, err := aes.NewCipher([]byte(key))
checkErr(err)
b := base64.StdEncoding.EncodeToString(text)
ciphertext := make([]byte, aes.BlockSize+len(b))
iv := ciphertext[:aes.BlockSize]
_, err = io.ReadFull(rand.Reader, iv)
checkErr(err)
cfb := cipher.NewCFBEncrypter(block, iv)
cfb.XORKeyStream(ciphertext[aes.BlockSize:], []byte(b))
return encodeBase64(string(ciphertext))
}
func Decrypt(textstr string) string {
text := []byte(decodeBase64(textstr))
key := []byte(keystr)
//checkErr(err)
block, err := aes.NewCipher(key)
checkErr(err)
if len(text) < aes.BlockSize {
return "GEEEH SCHIESSEN! ZU Kurz?"
//return nil, errors.New("ciphertext too short")
}
iv := text[:aes.BlockSize]
text = text[aes.BlockSize:]
cfb := cipher.NewCFBDecrypter(block, iv)
cfb.XORKeyStream(text, text)
//data, err := base64.StdEncoding.DecodeString(string(text[aes.BlockSize:]))
data, err := base64.StdEncoding.DecodeString(string(text))
checkErr(err)
return string(data)
//if err != nil { panic(err) }
//ciphertext := decodeBase64(text)
//cfb := cipher.NewCFBEncrypter(block, iv)
//plaintext := make([]byte, len(ciphertext))
//cfb.XORKeyStream(plaintext, ciphertext)
//return string(plaintext)
}
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