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package handshake
import (
"github.com/pion/dtls/v2/internal/util"
)
// MessageCertificate is a DTLS Handshake Message
// it can contain either a Client or Server Certificate
//
// https://tools.ietf.org/html/rfc5246#section-7.4.2
type MessageCertificate struct {
Certificate [][]byte
}
// Type returns the Handshake Type
func (m MessageCertificate) Type() Type {
return TypeCertificate
}
const (
handshakeMessageCertificateLengthFieldSize = 3
)
// Marshal encodes the Handshake
func (m *MessageCertificate) Marshal() ([]byte, error) {
out := make([]byte, handshakeMessageCertificateLengthFieldSize)
for _, r := range m.Certificate {
// Certificate Length
out = append(out, make([]byte, handshakeMessageCertificateLengthFieldSize)...)
util.PutBigEndianUint24(out[len(out)-handshakeMessageCertificateLengthFieldSize:], uint32(len(r)))
// Certificate body
out = append(out, append([]byte{}, r...)...)
}
// Total Payload Size
util.PutBigEndianUint24(out[0:], uint32(len(out[handshakeMessageCertificateLengthFieldSize:])))
return out, nil
}
// Unmarshal populates the message from encoded data
func (m *MessageCertificate) Unmarshal(data []byte) error {
if len(data) < handshakeMessageCertificateLengthFieldSize {
return errBufferTooSmall
}
if certificateBodyLen := int(util.BigEndianUint24(data)); certificateBodyLen+handshakeMessageCertificateLengthFieldSize != len(data) {
return errLengthMismatch
}
offset := handshakeMessageCertificateLengthFieldSize
for offset < len(data) {
certificateLen := int(util.BigEndianUint24(data[offset:]))
offset += handshakeMessageCertificateLengthFieldSize
if offset+certificateLen > len(data) {
return errLengthMismatch
}
m.Certificate = append(m.Certificate, append([]byte{}, data[offset:offset+certificateLen]...))
offset += certificateLen
}
return nil
}
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