124 lines
2.1 KiB
Go
124 lines
2.1 KiB
Go
package types
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"io"
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cbg "github.com/whyrusleeping/cbor-gen"
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)
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const SignatureMaxLength = 200
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const (
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KTSecp256k1 = "secp256k1"
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KTBLS = "bls"
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)
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const (
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IKTUnknown = -1
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IKTSecp256k1 = iota
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IKTBLS
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)
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type Signature struct {
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Type string
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Data []byte
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}
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func SignatureFromBytes(x []byte) (Signature, error) {
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val, nr := binary.Uvarint(x)
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if nr != 1 {
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return Signature{}, fmt.Errorf("signatures with type field longer than one byte are invalid")
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}
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var ts string
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switch val {
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case IKTSecp256k1:
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ts = KTSecp256k1
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case IKTBLS:
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ts = KTBLS
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default:
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return Signature{}, fmt.Errorf("unsupported signature type: %d", val)
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}
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return Signature{
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Type: ts,
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Data: x[1:],
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}, nil
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}
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func (s *Signature) TypeCode() int {
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switch s.Type {
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case KTSecp256k1:
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return IKTSecp256k1
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case KTBLS:
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return IKTBLS
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default:
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return IKTUnknown
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}
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}
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func (s *Signature) MarshalCBOR(w io.Writer) error {
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if s == nil {
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_, err := w.Write(cbg.CborNull)
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return err
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}
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header := cbg.CborEncodeMajorType(cbg.MajByteString, uint64(len(s.Data)+1))
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if _, err := w.Write(header); err != nil {
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return err
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}
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if _, err := w.Write([]byte{byte(s.TypeCode())}); err != nil {
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return err
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}
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if _, err := w.Write(s.Data); err != nil {
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return err
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}
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return nil
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}
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func (s *Signature) UnmarshalCBOR(br io.Reader) error {
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maj, l, err := cbg.CborReadHeader(br)
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if err != nil {
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return err
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}
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if maj != cbg.MajByteString {
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return fmt.Errorf("cbor input for signature was not a byte string")
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}
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if l > SignatureMaxLength {
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return fmt.Errorf("cbor byte array for signature was too long")
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}
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buf := make([]byte, l)
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if _, err := io.ReadFull(br, buf); err != nil {
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return err
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}
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switch buf[0] {
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default:
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return fmt.Errorf("invalid signature type in cbor input: %d", buf[0])
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case IKTSecp256k1:
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s.Type = KTSecp256k1
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case IKTBLS:
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s.Type = KTBLS
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}
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s.Data = buf[1:]
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return nil
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}
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func (s *Signature) Equals(o *Signature) bool {
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if s == nil || o == nil {
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return s == o
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}
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return s.Type == o.Type && bytes.Equal(s.Data, o.Data)
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}
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