generate symmetric session key

1 files changed, 19 insertions, 0 deletions

diff --git a/key/symmetric.go b/key/symmetric.go
new file mode 100644
index 0000000..6acc8e9
--- /dev/null
+++ b/key/symmetric.go
@@ -0,0 +1,19 @@
+package key
+
+import (
+	crypto_rand "crypto/rand"
+	"crypto/sha3"
+	"github.com/keybase/saltpack"
+	"io"
+)
+
+func NewReceiverSymmetricKey() (saltpack.ReceiverSymmetricKey, error) {
+	var key saltpack.SymmetricKey
+	if _, err := io.ReadFull(crypto_rand.Reader, key[:]); err != nil {
+		return saltpack.ReceiverSymmetricKey{}, err
+	}
+
+	id := sha3.Sum512(key[:])
+
+	return saltpack.ReceiverSymmetricKey{key, id[:]}, nil
+}