load public key from file

1 files changed, 29 insertions, 0 deletions

diff --git a/key/key.go b/key/key.go
new file mode 100644
index 0000000..a427769
--- /dev/null
+++ b/key/key.go
@@ -0,0 +1,29 @@
+package key
+
+import (
+	"io"
+	"os"
+)
+
+// LoadPublicKey reads the public key from disc, or generates a new keypair
+// if it does not already exist.
+func LoadPublicKey() ([32]byte, error) {
+	// Generate a keypair if it doesn't already exist.
+	if err := generateIfNoExist(); err != nil {
+		return [32]byte{}, err
+	}
+
+	// Open key file.
+	f, err := os.Open(pubKeyFile)
+	if err != nil {
+		return [32]byte{}, err
+	}
+	defer f.Close()
+
+	// Read key.
+	var pubkey [32]byte
+	if _, err := io.ReadFull(f, pubkey[:]); err != nil {
+		return [32]byte{}, err
+	}
+	return pubkey, nil
+}