Daence is a deterministic authenticated cipher built out of Poly1305 and either Salsa20 or ChaCha, with good performance and high security even for extremely large volumes of data. This is a Go implementation of Salsa20-Daence and ChaCha-Daence based on golang.org/x/crypto, using the AEAD interface from crypto/cipher.

• WARNING: Daence is new and this software has only been lightly tested.

To try it out, run go test ./.... For experiments you can import mumble.net/~campbell/daence/go/salsa20daence or mumble.net/~campbell/daence/go/chachadaence, but WARNING: these URLs are not yet permanent.

import "mumble.net/~campbell/daence/go/chachadaence"

func main() {
	key := [64]byte{0x01, ...}
	associatedData := []byte("header")
	message := []byte("payload")

	d, _ := chachadaence.New(k)

	// Daence does not take a nonce, so pass an empty slice
	// []byte{} where the AEAD.Seal interface expects a nonce.
	ciphertext := d.Seal(nil, []byte{}, message, associatedData)
	...
	message1, err := d.Open(nil, []byte{}, ciphertext, associatedData)
	if err != nil {
		// reject forgery
	}
	...
}