func (key *RSA) MakeXMLNode(doc types.Document) (types.Node, error) {
var root types.Node
var err error
prefix, err := doc.LookupNamespacePrefix(xmlsec.DSigNs)
if err != nil {
// namespace does not exist. make me a namespace
root, err = doc.CreateElementNS(xmlsec.DSigNs, xmlsec.Prefix+":KeyInfo")
if err != nil {
return nil, err
}
prefix = xmlsec.Prefix
} else {
root, err = doc.CreateElement(prefix + ":KeyInfo")
if err != nil {
return nil, err
}
}
defer root.AutoFree()
root.MakeMortal()
kvnode, err := doc.CreateElement(prefix + ":KeyValue")
if err != nil {
return nil, err
}
root.AddChild(kvnode)
rsakeynode, err := doc.CreateElement(prefix + ":RSAKeyValue")
if err != nil {
return nil, err
}
kvnode.AddChild(rsakeynode)
mnode, err := doc.CreateElement(prefix + ":Modulus")
if err != nil {
return nil, err
}
mnode.AppendText(base64.StdEncoding.EncodeToString(key.key.N.Bytes()))
rsakeynode.AddChild(mnode)
enode, err := doc.CreateElement(prefix + ":Exponent")
if err != nil {
return nil, err
}
data := make([]byte, 8)
binary.BigEndian.PutUint64(data, uint64(key.key.E))
i := 0
for ; i < len(data); i++ {
if data[i] != 0x0 {
break
}
}
enode.AppendText(base64.StdEncoding.EncodeToString(data[i:]))
rsakeynode.AddChild(enode)
root.MakePersistent()
return root, nil
}
// NewSignature creates a Signature object.
func NewSignature(n types.Node, c14n, sig TransformID, id string) (*Signature, error) {
doc, err := n.OwnerDocument()
if err != nil {
return nil, err
}
signnode, err := clib.XMLSecTmplSignatureCreateNsPref(
doc,
clib.TransformID(c14n),
clib.TransformID(sig),
id,
clib.Prefix,
)
if err != nil {
return nil, err
}
n.AddChild(signnode)
return &Signature{
signmethod: sig,
signnode: signnode,
}, nil
}
// Construct takes the node and creates a new Key. The node must be
// a KeyInfo node
func Construct(n types.Node) (Key, error) {
ne, ok := n.(types.Element)
if !ok || ne.LocalName() != "KeyInfo" {
return nil, errors.New("invalid node (expected KeyInfo)")
}
kv, err := ne.FirstChild()
if err != nil {
return nil, err
}
kve, ok := kv.(types.Element)
if !ok || kve.LocalName() != "KeyValue" {
return nil, errors.New("invalid node (expected KeyValue)")
}
kn, err := kv.FirstChild()
if err != nil {
return nil, err
}
kne, ok := kn.(types.Element)
if !ok {
return nil, errors.New("invalid node (expected element node)")
}
switch kne.LocalName() {
case "RSAKeyValue":
pubkey := &rsa.PublicKey{}
children, err := kne.ChildNodes()
if err != nil {
return nil, err
}
for _, x := range children {
n, ok := x.(types.Element)
if !ok {
return nil, errors.New("invalid under RSAKeyValue")
}
switch n.LocalName() {
case "Modulus":
v, err := base64.StdEncoding.DecodeString(n.TextContent())
if err != nil {
return nil, err
}
pubkey.N = (&big.Int{}).SetBytes(v)
case "Exponent":
v, err := base64.StdEncoding.DecodeString(n.TextContent())
if err != nil {
return nil, err
}
if len(v) < 64 {
b := make([]byte, 64)
copy(b[64-len(v):], v)
v = b
}
pubkey.E = int(binary.BigEndian.Uint64(v))
}
}
return NewRSA(pubkey), nil
case "DSAKeyValue":
pubkey := &dsa.PublicKey{}
children, err := kne.ChildNodes()
if err != nil {
return nil, err
}
for _, x := range children {
n, ok := x.(types.Element)
if !ok {
return nil, errors.New("invalid under DSAKeyValue")
}
switch n.LocalName() {
case "P":
v, err := base64.StdEncoding.DecodeString(n.TextContent())
if err != nil {
return nil, err
}
pubkey.P = (&big.Int{}).SetBytes(v)
case "Q":
v, err := base64.StdEncoding.DecodeString(n.TextContent())
if err != nil {
return nil, err
}
pubkey.Q = (&big.Int{}).SetBytes(v)
case "G":
v, err := base64.StdEncoding.DecodeString(n.TextContent())
if err != nil {
return nil, err
}
pubkey.G = (&big.Int{}).SetBytes(v)
case "Y":
v, err := base64.StdEncoding.DecodeString(n.TextContent())
if err != nil {
return nil, err
}
pubkey.Y = (&big.Int{}).SetBytes(v)
}
}
return NewDSA(pubkey), nil
default:
return nil, errors.New("invalid node expected: DSAKeyValue or RSAKeyValue")
}
}
// MakeXMLNode creates a libxml2 node tree to represent this DSA key
func (key *DSA) MakeXMLNode(doc types.Document) (types.Node, error) {
var root types.Node
var err error
prefix, err := doc.LookupNamespacePrefix(xmlsec.DSigNs)
if err != nil {
// namespace does not exist. make me a namespace
root, err = doc.CreateElementNS(xmlsec.DSigNs, xmlsec.Prefix+":KeyInfo")
if err != nil {
return nil, err
}
prefix = xmlsec.Prefix
} else {
root, err = doc.CreateElement(prefix + ":KeyInfo")
if err != nil {
return nil, err
}
}
defer root.AutoFree()
root.MakeMortal()
kvnode, err := doc.CreateElement(prefix + ":KeyValue")
if err != nil {
return nil, err
}
root.AddChild(kvnode)
dsakeynode, err := doc.CreateElement(prefix + ":DSAKeyValue")
if err != nil {
return nil, err
}
kvnode.AddChild(dsakeynode)
pnode, err := doc.CreateElement(prefix + ":P")
if err != nil {
return nil, err
}
pnode.AppendText(base64.StdEncoding.EncodeToString(key.key.P.Bytes()))
dsakeynode.AddChild(pnode)
qnode, err := doc.CreateElement(prefix + ":Q")
if err != nil {
return nil, err
}
qnode.AppendText(base64.StdEncoding.EncodeToString(key.key.Q.Bytes()))
dsakeynode.AddChild(qnode)
gnode, err := doc.CreateElement(prefix + ":G")
if err != nil {
return nil, err
}
gnode.AppendText(base64.StdEncoding.EncodeToString(key.key.G.Bytes()))
dsakeynode.AddChild(gnode)
ynode, err := doc.CreateElement(prefix + ":Y")
if err != nil {
return nil, err
}
ynode.AppendText(base64.StdEncoding.EncodeToString(key.key.Y.Bytes()))
dsakeynode.AddChild(ynode)
root.MakePersistent()
return root, nil
}