testing and improvements to the common data structures

lib/common/key_certificate.go

@@ -0,0 +1,46 @@
+package common
+
+import (
+	"github.com/bounce-chat/go-i2p/lib/crypto"
+)
+
+type KeyCertificate []byte
+
+func (key_certificate KeyCertificate) Type() byte {
+	return Certificate(key_certificate).Type()
+}
+
+func (key_certificate KeyCertificate) Data() ([]byte, error) {
+	return Certificate(key_certificate).Data()
+}
+
+// get the signing public key from this key cert
+func (key_certificate KeyCertificate) SigningPublicKey() (k crypto.SigningPublicKey) {
+	data, err := key_certificate.Data()
+	if err != nil {
+		return
+	}
+	ktype := Integer(data[:2])
+	// set data to be the key data now
+	data = data[4:]
+	// determine the key type
+	if ktype == KEYCERT_SIGN_DSA_SHA1 {
+		var pk crypto.DSAPublicKey
+		copy(pk[:], data[:pk.Len()])
+		k = pk
+	} else if ktype == KEYCERT_SIGN_P256 {
+		var pk crypto.ECP256PublicKey
+		copy(pk[:], data[:pk.Len()])
+		k = pk
+	} else if ktype == KEYCERT_SIGN_P384 {
+		var pk crypto.ECP384PublicKey
+		copy(pk[:], data[:pk.Len()])
+		k = pk
+	} else if ktype == KEYCERT_SIGN_P521 {
+		var pk crypto.ECP521PublicKey
+		copy(pk[:], data[:pk.Len()])
+		k = pk
+	}
+	// TODO: rsa/eddsa
+	return
+}