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