forked from daptin/daptin
/
encryption_decryption.go
77 lines (60 loc) · 1.86 KB
/
encryption_decryption.go
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package resource
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"fmt"
"github.com/pkg/errors"
"io"
)
func main() {
originalText := "Encrypt this golang"
fmt.Println(originalText)
key := []byte("example key 1234")
// Encrypt value to base64
cryptoText, _ := Encrypt(key, originalText)
fmt.Println(cryptoText)
// Encrypt base64 crypto to original value
text, _ := Decrypt(key, cryptoText)
fmt.Printf(text)
}
// Encrypt string to base64 crypto using AES
func Encrypt(key []byte, text string) (string, error) {
// key := []byte(keyText)
plaintext := []byte(text)
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
// The IV needs to be unique, but not secure. Therefore it's common to
// include it at the beginning of the ciphertext.
ciphertext := make([]byte, aes.BlockSize+len(plaintext))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return "", err
}
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
// convert to base64
return base64.URLEncoding.EncodeToString(ciphertext), nil
}
// Decrypt from base64 to decrypted string
func Decrypt(key []byte, cryptoText string) (string, error) {
ciphertext, _ := base64.URLEncoding.DecodeString(cryptoText)
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
// The IV needs to be unique, but not secure. Therefore it's common to
// include it at the beginning of the ciphertext.
if len(ciphertext) < aes.BlockSize {
return "", errors.New("Chipher text too short")
}
iv := ciphertext[:aes.BlockSize]
ciphertext = ciphertext[aes.BlockSize:]
stream := cipher.NewCFBDecrypter(block, iv)
// XORKeyStream can work in-place if the two arguments are the same.
stream.XORKeyStream(ciphertext, ciphertext)
return fmt.Sprintf("%s", ciphertext), nil
}