add proper pem interface

This should finally resolve the completely broken and wrong API to get a
pem representation of a resource.

1 files changed, 10 insertions, 2 deletions

diff --git a/ecdsa.go b/ecdsa.go
index 66b73f5..8bf432d 100644
--- a/ecdsa.go
+++ b/ecdsa.go
@@ -78,14 +78,22 @@ func (pr EcdsaPrivateKey) PrivateKey() crypto.PrivateKey {
 // This function implements the Pemmer interface to marshal the private key
 // into a pem block.
 func (pr EcdsaPrivateKey) MarshalPem() (io.WriterTo, error) {
-	asn1, err := x509.MarshalECPrivateKey(pr.private_key)
+	pem_block, err := pr.ToPem()
 	if err != nil {
 		return nil, err
 	}
-	pem_block := pem.Block{Type: PemLabelEcdsa, Bytes: asn1}
 	return marshalledPemBlock(pem.EncodeToMemory(&pem_block)), nil
 }
 
+// This function implements ToPem to return the raw pem block.
+func (pr EcdsaPrivateKey) ToPem() (pem.Block, error) {
+	asn1, err := x509.MarshalECPrivateKey(pr.private_key)
+	if err != nil {
+		return pem.Block{}, err
+	}
+	return pem.Block{Type: PemLabelEcdsa, Bytes: asn1}, nil
+}
+
 // This functoin loads an ecdsa public key from the asn.1 representation.
 func LoadPublicKeyEcdsa(raw []byte) (*EcdsaPublicKey, error) {
 	raw_pub, err := x509.ParsePKIXPublicKey(raw)