Crypto and input management packages.

pkg/crypto/encryption.go

@@ -0,0 +1,35 @@
+package crypto
+
+import (
+	"crypto/rand"
+
+	"golang.org/x/crypto/chacha20poly1305"
+)
+
+func Encrypt(key, msg []byte) []byte {
+	aead, err := chacha20poly1305.NewX(key)
+	if err != nil {
+		panic(err)
+	}
+
+	nonce := make([]byte, aead.NonceSize(), aead.NonceSize()+len(msg)+aead.Overhead())
+	if _, err := rand.Read(nonce); err != nil {
+		panic(err)
+	}
+
+	return aead.Seal(nonce, nonce, msg, nil)
+}
+
+func Decrypt(key, encryptedMsg []byte) []byte {
+	aead, err := chacha20poly1305.NewX(key)
+	if err != nil {
+		panic(err)
+	}
+
+	nonce, ciphertext := encryptedMsg[:aead.NonceSize()], encryptedMsg[aead.NonceSize():]
+	msg, err := aead.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		panic(err)
+	}
+	return msg
+}