ceremonyclient/bedlam/apps/garbled/examples/encrypt.qcl

// -*- go -*-

// Example how to encrypt fixed sized data with AES-128-GCM.
//
// Run the Evaluator with two inputs: evaluator's key and nonce shares:
//
//	./garbled -e -i 0x8cd98b88adab08d6d60fe57c8b8a33f3,0xfd5e0f8f155e7102aa526ad0 examples/encrypt.qcl
//
// The Garbler takes three arguments: the message to encrypt, and its
// key and nonce shares:
//
//	./garbled -i 0x48656c6c6f2c20776f726c6421,0xed800b17b0c9d2334b249332155ddef5,0xa300751458c775a08762c2cd examples/encrypt.qcl
package main

import (
	"crypto/cipher/gcm"
)

type Garbler struct {
	msg        [64]byte
	keyShare   [16]byte
	nonceShare [12]byte
}

type Evaluator struct {
	keyShare   [16]byte
	nonceShare [12]byte
}

func main(g Garbler, e Evaluator) []byte {
	var key [16]byte

	for i := 0; i < len(key); i++ {
		key[i] = g.keyShare[i] ^ e.keyShare[i]
	}

	var nonce [12]byte

	for i := 0; i < len(nonce); i++ {
		nonce[i] = g.nonceShare[i] ^ e.nonceShare[i]
	}

	return gcm.EncryptAES128(key, nonce, g.msg, []byte("unused"))
}