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60 lines
1.1 KiB
60 lines
1.1 KiB
package util
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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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"github.com/chrislusf/seaweedfs/weed/glog"
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)
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type CipherKey []byte
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func GenCipherKey() CipherKey {
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key := make([]byte, 32)
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if _, err := io.ReadFull(rand.Reader, key); err != nil {
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glog.Fatalf("random key gen: %v", err)
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}
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return CipherKey(key)
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}
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func Encrypt(plaintext []byte, key CipherKey) ([]byte, error) {
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c, 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(c)
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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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func Decrypt(ciphertext []byte, key CipherKey) ([]byte, error) {
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c, 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(c)
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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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