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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package cipher | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "errors" | ||
| "io" | ||
| ) | ||
|
|
||
| var ErrDecrypting = errors.New("unable to decrypt") | ||
|
|
||
| type Cipher interface { | ||
| Encrypt(plaintext []byte) ([]byte, error) | ||
| Decrypt(ciphertext []byte) ([]byte, error) | ||
| } | ||
|
|
||
| func Random(b []byte) error { | ||
| if _, err := io.ReadFull(rand.Reader, b); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func Rotator(latest Cipher, priors ...Cipher) Cipher { | ||
| return &rotator{append([]Cipher{latest}, priors...)} | ||
| } | ||
|
|
||
| type rotator struct { | ||
| ciphers []Cipher | ||
| } | ||
|
|
||
| // Decrypt with any past or present cipher | ||
| func (r *rotator) Decrypt(ciphertext []byte) ([]byte, error) { | ||
| for _, c := range r.ciphers { | ||
| plaintext, err := c.Decrypt(ciphertext) | ||
| if err != nil { | ||
| if !errors.Is(err, ErrDecrypting) { | ||
| return nil, err | ||
| } | ||
| continue | ||
| } | ||
| return plaintext, nil | ||
| } | ||
| return nil, ErrDecrypting | ||
| } | ||
|
|
||
| // Encrypt with the latest cipher | ||
| func (r *rotator) Encrypt(plaintext []byte) ([]byte, error) { | ||
| return r.ciphers[0].Encrypt(plaintext) | ||
| } |
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