checking in for the night.

key generation should be done, need to finish packing/formatting.

also need to start on moduli generation.

sshkeys/rsa.go

@@ -0,0 +1,23 @@
+package sshkeys
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+)
+
+func (k *SSHPrivKey) generateRsa() error {
+	if k.BitSize == 0 {
+		k.BitSize = defRSABitSize
+	}
+	if k.Key != nil || k.PublicKey.Key != nil {
+		return nil // A no-op; key already exists.
+	}
+	if sk, err := rsa.GenerateKey(rand.Reader, int(k.BitSize)); err != nil {
+		return err
+	} else {
+		k.Key = sk // See https://golang.org/pkg/crypto/rsa/#PrivateKey
+		k.PublicKey.KeyType = KeyRsa
+		k.PublicKey.Key = k.Key.PublicKey
+	}
+	return nil
+}