Half baked ssh key generation.

I'll just probably rework this whole thing.

docker/ssh.go

@@ -0,0 +1,45 @@
+package docker 
+
+import (
+	"crypto/ed25519"
+	"crypto/rand"
+	"crypto/x509"
+	"encoding/pem"
+
+	"golang.org/x/crypto/ssh"
+)
+
+type Keypair struct {
+	public []byte
+	private []byte
+}
+
+func generateKeypair() Keypair {
+	publicKey, privateKey, err := ed25519.GenerateKey(rand.Reader)
+	if err != nil {
+		panic(err)
+	}
+
+	privBytes, err := x509.MarshalPKCS8PrivateKey(privateKey)
+	if err != nil {
+		panic(err)
+	}
+
+	privPem := pem.EncodeToMemory(&pem.Block{
+		Type:  "PRIVATE KEY",
+		Bytes: privBytes,
+	})
+
+	sshPubKey, err := ssh.NewPublicKey(publicKey)
+	if err != nil {
+		panic(err)
+	}
+
+	pubBytes := ssh.MarshalAuthorizedKey(sshPubKey)
+
+	return Keypair{
+		private: privPem,
+		public: pubBytes,
+	};
+
+}