anders
0c1047d390
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65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
package crypto
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"errors"
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"io"
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"golang.org/x/crypto/argon2"
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)
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// DeriveKey derives a 256-bit key from password and salt using Argon2id.
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func DeriveKey(password []byte, salt []byte) []byte {
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return argon2.IDKey(password, salt, 3, 64*1024, 4, 32)
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}
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// GenerateSalt returns a random 16-byte salt.
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func GenerateSalt() ([]byte, error) {
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salt := make([]byte, 16)
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_, err := io.ReadFull(rand.Reader, salt)
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return salt, err
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}
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// Encrypt encrypts plaintext with AES-256-GCM using the given key.
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func Encrypt(plaintext, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return nil, err
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}
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return gcm.Seal(nonce, nonce, plaintext, nil), nil
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}
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// Decrypt decrypts AES-256-GCM ciphertext using the given key.
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func Decrypt(ciphertext, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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nonceSize := gcm.NonceSize()
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if len(ciphertext) < nonceSize {
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return nil, errors.New("ciphertext too short")
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}
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nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
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return gcm.Open(nil, nonce, ciphertext, nil)
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}
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