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package security
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"golang.org/x/crypto/scrypt"
)
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
}
func DeriveKey(password, salt []byte) ([]byte, []byte, error) {
if salt == nil {
salt = make([]byte, 16)
if _, err := rand.Read(salt); err != nil {
return nil, nil, err
}
}
key, err := scrypt.Key(password, salt, 16384, 8, 1, 16)
if err != nil {
return nil, nil, err
}
return key, salt, nil
}
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