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encrypt.go
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encrypt.go
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package encryption
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"golang.org/x/crypto/scrypt"
)
func DeriveKeyByStretching(password, salt []byte) ([]byte, []byte, error) {
if salt == nil {
salt = make([]byte, 32)
if _, err := rand.Read(salt); err != nil {
return nil, nil, err
}
}
key, err := scrypt.Key(password, salt, 1048576, 8, 1, 32)
if err != nil {
return nil, nil, err
}
return key, salt, nil
}
func EncryptUsingPassword(password, data []byte) ([]byte, []byte, error) {
key, salt, err := DeriveKeyByStretching(password, nil)
if err != nil {
return nil, nil, err
}
blockCipher, err := aes.NewCipher(key)
if err != nil {
return nil, nil, err
}
gcm, err := cipher.NewGCM(blockCipher)
if err != nil {
return nil, nil, err
}
nonce := make([]byte, gcm.NonceSize())
if _, err = rand.Read(nonce); err != nil {
return nil, nil, err
}
ciphertext := gcm.Seal(nonce, nonce, data, nil)
return ciphertext, salt, nil
}
func DecryptUsingPassword(password, salt, data []byte) ([]byte, error) {
key, _, err := DeriveKeyByStretching(password, salt)
if err != nil {
return nil, err
}
blockCipher, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(blockCipher)
if err != nil {
return nil, err
}
nonce, ciphertext := data[:gcm.NonceSize()], data[gcm.NonceSize():]
plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return nil, err
}
return plaintext, nil
}
func EncryptUsingKey(key, data []byte) ([]byte, error) {
return encrypt(key, data)
}
func DecryptUsingKey(key, data []byte) ([]byte, error) {
return decrypt(key, data)
}
func encrypt(key, data []byte) ([]byte, error) {
blockCipher, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(blockCipher)
if err != nil {
return nil, err
}
nonce := make([]byte, gcm.NonceSize())
if _, err = rand.Read(nonce); err != nil {
return nil, err
}
ciphertext := gcm.Seal(nonce, nonce, data, nil)
return ciphertext, nil
}
func decrypt(key, data []byte) ([]byte, error) {
blockCipher, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(blockCipher)
if err != nil {
return nil, err
}
nonce, ciphertext := data[:gcm.NonceSize()], data[gcm.NonceSize():]
plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return nil, err
}
return plaintext, nil
}