srtp_cipher_unencrypted.go

package srtp

import (
	"crypto/cipher"
	"github.com/pion/rtp"
)


type srtpCipherUnencrypted struct {
	srtpCipher, srtcpCipher cipher.AEAD

	srtpSessionSalt, srtcpSessionSalt []byte
}

func newSrtpCipherUnencrypted(masterKey, masterSalt []byte) (*srtpCipherUnencrypted, error) {
	s := &srtpCipherUnencrypted{}
	return s, nil
}

func (s *srtpCipherUnencrypted) authTagLen() int {
	return 0
}

func (s *srtpCipherUnencrypted) aeadAuthTagLen() int {
	return 0
}

func (s *srtpCipherUnencrypted) encryptRTP(dst []byte, header *rtp.Header, payload []byte, roc uint32) (ciphertext []byte, err error) {
	dst = growBufferSize(dst, header.MarshalSize()+len(payload)+s.aeadAuthTagLen())

	hdr, err := header.Marshal()
	if err != nil {
		return nil, err
	}
	nHdr := len(hdr)
	copy(dst[:nHdr], hdr)
	copy(dst[nHdr:], payload)
	return dst, nil
}

func (s *srtpCipherUnencrypted) decryptRTP(dst, ciphertext []byte, header *rtp.Header, headerLen int, roc uint32) ([]byte, error){
	dst = growBufferSize(dst, len(ciphertext))
	copy(dst, ciphertext)
	return ciphertext, nil
}

func (s *srtpCipherUnencrypted) encryptRTCP(dst, decrypted []byte, srtcpIndex uint32, ssrc uint32) ([]byte, error) {
	dst = growBufferSize(dst, len(decrypted))
	copy(dst, decrypted)
	return dst, nil
}

func (s *srtpCipherUnencrypted) decryptRTCP(dst, encrypted []byte, srtcpIndex, ssrc uint32) ([]byte, error) {
	dst = growBufferSize(dst, len(encrypted))
	copy(dst, encrypted)
	return dst, nil
}

func (s *srtpCipherUnencrypted) getRTCPIndex(in []byte) uint32 {
	return 0
}