mirror of
https://github.com/schollz/croc.git
synced 2024-11-28 09:35:14 +03:00
126 lines
3.0 KiB
Go
126 lines
3.0 KiB
Go
package main
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/rand"
|
|
"crypto/sha1"
|
|
"crypto/sha256"
|
|
"encoding/binary"
|
|
"encoding/hex"
|
|
"fmt"
|
|
mathrand "math/rand"
|
|
"os"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/mars9/crypt"
|
|
"github.com/schollz/mnemonicode"
|
|
log "github.com/sirupsen/logrus"
|
|
"golang.org/x/crypto/pbkdf2"
|
|
)
|
|
|
|
func init() {
|
|
mathrand.Seed(time.Now().UTC().UnixNano())
|
|
}
|
|
|
|
func GetRandomName() string {
|
|
result := []string{}
|
|
bs := make([]byte, 4)
|
|
binary.LittleEndian.PutUint32(bs, mathrand.Uint32())
|
|
result = mnemonicode.EncodeWordList(result, bs)
|
|
return strings.Join(result, "-")
|
|
}
|
|
|
|
func Encrypt(plaintext []byte, passphrase string, dontencrypt ...bool) (encrypted []byte, salt string, iv string) {
|
|
if len(dontencrypt) > 0 && dontencrypt[0] {
|
|
return plaintext, "salt", "iv"
|
|
}
|
|
key, saltBytes := deriveKey(passphrase, nil)
|
|
ivBytes := make([]byte, 12)
|
|
// http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf
|
|
// Section 8.2
|
|
rand.Read(ivBytes)
|
|
b, _ := aes.NewCipher(key)
|
|
aesgcm, _ := cipher.NewGCM(b)
|
|
encrypted = aesgcm.Seal(nil, ivBytes, plaintext, nil)
|
|
salt = hex.EncodeToString(saltBytes)
|
|
iv = hex.EncodeToString(ivBytes)
|
|
return
|
|
}
|
|
|
|
func Decrypt(data []byte, passphrase string, salt string, iv string, dontencrypt ...bool) (plaintext []byte, err error) {
|
|
if len(dontencrypt) > 0 && dontencrypt[0] {
|
|
return data, nil
|
|
}
|
|
saltBytes, _ := hex.DecodeString(salt)
|
|
ivBytes, _ := hex.DecodeString(iv)
|
|
key, _ := deriveKey(passphrase, saltBytes)
|
|
b, _ := aes.NewCipher(key)
|
|
aesgcm, _ := cipher.NewGCM(b)
|
|
plaintext, err = aesgcm.Open(nil, ivBytes, data, nil)
|
|
return
|
|
}
|
|
|
|
func deriveKey(passphrase string, salt []byte) ([]byte, []byte) {
|
|
if salt == nil {
|
|
salt = make([]byte, 8)
|
|
// http://www.ietf.org/rfc/rfc2898.txt
|
|
// Salt.
|
|
rand.Read(salt)
|
|
}
|
|
return pbkdf2.Key([]byte(passphrase), salt, 1000, 32, sha256.New), salt
|
|
}
|
|
|
|
func Hash(data string) string {
|
|
return HashBytes([]byte(data))
|
|
}
|
|
|
|
func HashBytes(data []byte) string {
|
|
sum := sha256.Sum256(data)
|
|
return fmt.Sprintf("%x", sum)
|
|
}
|
|
|
|
func EncryptFile(inputFilename string, outputFilename string, password string) error {
|
|
return cryptFile(inputFilename, outputFilename, password, true)
|
|
}
|
|
|
|
func DecryptFile(inputFilename string, outputFilename string, password string) error {
|
|
return cryptFile(inputFilename, outputFilename, password, false)
|
|
}
|
|
|
|
func cryptFile(inputFilename string, outputFilename string, password string, encrypt bool) error {
|
|
in, err := os.Open(inputFilename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer in.Close()
|
|
out, err := os.Create(outputFilename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer func() {
|
|
if err := out.Sync(); err != nil {
|
|
log.Error(err)
|
|
}
|
|
if err := out.Close(); err != nil {
|
|
log.Error(err)
|
|
}
|
|
}()
|
|
c := &crypt.Crypter{
|
|
HashFunc: sha1.New,
|
|
HashSize: sha1.Size,
|
|
Key: crypt.NewPbkdf2Key([]byte(password), 32),
|
|
}
|
|
if encrypt {
|
|
if err := c.Encrypt(out, in); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
if err := c.Decrypt(out, in); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|