Added ephemeral ssh keys.

shared/ssh.go

@@ -0,0 +1,40 @@
+package shared 
+
+import (
+	"crypto/ed25519"
+	"crypto/rand"
+	"encoding/pem"
+
+	"golang.org/x/crypto/ssh"
+)
+
+type Keypair struct {
+	Public string 
+	Private string 
+}
+
+func GenerateSSHKeypair() Keypair {
+	publicKey, privateKey, err := ed25519.GenerateKey(rand.Reader)
+	if err != nil {
+		panic(err)
+	}
+
+	privBlock, err := ssh.MarshalPrivateKey(privateKey, "")
+	if err != nil {
+		panic(err)
+	}
+
+	privPem := pem.EncodeToMemory(privBlock)
+
+	sshPubKey, err := ssh.NewPublicKey(publicKey)
+	if err != nil {
+		panic(err)
+	}
+
+	pubBytes := ssh.MarshalAuthorizedKey(sshPubKey)
+
+	return Keypair{
+		Private: string(privPem),
+		Public:  string(pubBytes),
+	}
+}