Decrypt decrypts an encrypted message. Uses AES128 keys in GCM (Galois/Counter Mode).
(key types.AES128Key, encrypted []byte)
| 50 | // Decrypt decrypts an encrypted message. |
| 51 | // Uses AES128 keys in GCM (Galois/Counter Mode). |
| 52 | func Decrypt(key types.AES128Key, encrypted []byte) ([]byte, error) { |
| 53 | cipherBlock, err := aes.NewCipher(key[:]) |
| 54 | if err != nil { |
| 55 | return nil, err |
| 56 | } |
| 57 | gcm, err := cipher.NewGCM(cipherBlock) |
| 58 | if err != nil { |
| 59 | return nil, err |
| 60 | } |
| 61 | if len(encrypted) < gcm.NonceSize() { |
| 62 | return nil, errMalformedCipherText.New() |
| 63 | } |
| 64 | return gcm.Open(nil, |
| 65 | encrypted[:gcm.NonceSize()], |
| 66 | encrypted[gcm.NonceSize():], |
| 67 | nil, |
| 68 | ) |
| 69 | } |