mirror of https://github.com/synctv-org/synctv.git
79 lines
1.5 KiB
Go
79 lines
1.5 KiB
Go
package utils
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/rand"
|
|
"encoding/base64"
|
|
"errors"
|
|
"io"
|
|
)
|
|
|
|
func Crypto(v []byte, key []byte) ([]byte, error) {
|
|
block, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ciphertext := make([]byte, aes.BlockSize+len(v))
|
|
iv := ciphertext[:aes.BlockSize]
|
|
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
stream := cipher.NewCFBEncrypter(block, iv)
|
|
stream.XORKeyStream(ciphertext[aes.BlockSize:], v)
|
|
|
|
return ciphertext, nil
|
|
}
|
|
|
|
func Decrypto(v []byte, key []byte) ([]byte, error) {
|
|
block, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(v) < aes.BlockSize {
|
|
return nil, errors.New("ciphertext too short")
|
|
}
|
|
iv := v[:aes.BlockSize]
|
|
v = v[aes.BlockSize:]
|
|
|
|
stream := cipher.NewCFBDecrypter(block, iv)
|
|
stream.XORKeyStream(v, v)
|
|
|
|
return v, nil
|
|
}
|
|
|
|
func CryptoToBase64(v []byte, key []byte) (string, error) {
|
|
ciphertext, err := Crypto(v, key)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return base64.StdEncoding.EncodeToString(ciphertext), nil
|
|
}
|
|
|
|
func DecryptoFromBase64(v string, key []byte) ([]byte, error) {
|
|
ciphertext, err := base64.StdEncoding.DecodeString(v)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return Decrypto(ciphertext, key)
|
|
}
|
|
|
|
func GenCryptoKey(base string) []byte {
|
|
key := make([]byte, 32)
|
|
for i := 0; i < len(base); i++ {
|
|
key[i%32] ^= base[i]
|
|
}
|
|
return key
|
|
}
|
|
|
|
func GenCryptoKeyWithBytes(base []byte) []byte {
|
|
key := make([]byte, 32)
|
|
for i := 0; i < len(base); i++ {
|
|
key[i%32] ^= base[i]
|
|
}
|
|
return key
|
|
}
|