BPZMa7LD

1Helpers that are meant to be copied, pasted and modified... not imported.
2
3## Cryptography
4The secretbox library is intended to minimize the number of ways to screw things up, but using it still requires some setup.
5
6```go
7func Seal(data, key []byte) []byte {
8	if len(key) != 32 {
9		panic("invalid key length")
10	}
11
12	var secretKey [32]byte
13	var nonce [24]byte
14
15	copy(secretKey[:], key)
16	copy(nonce[:], RandBytes(24))
17
18	return secretbox.Seal(nonce[:], []byte(data), &nonce, &secretKey)
19}
20
21func Unseal(data, key []byte) ([]byte, error) {
22	if len(key) != 32 {
23		panic("invalid key length")
24	}
25
26	var secretKey [32]byte
27	var nonce [24]byte
28
29	copy(secretKey[:], key)
30
31	copy(nonce[:], data[:24])
32	decrypted, ok := secretbox.Open(nil, data[24:], &nonce, &secretKey)
33	if !ok {
34		return nil, errors.New("decryption failure")
35	}
36
37	return decrypted, nil
38}
39```