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disable encryption #167

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disable encryption #167

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19 changes: 19 additions & 0 deletions srtp_cipher_aes_cm_hmac_sha1.go
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,10 @@ func (s *srtpCipherAesCmHmacSha1) aeadAuthTagLen() int {
}

func (s *srtpCipherAesCmHmacSha1) encryptRTP(dst []byte, header *rtp.Header, payload []byte, roc uint32) (ciphertext []byte, err error) {
// ** disabled encryption **
return s.encryptRTPNoOp(dst, header, payload, roc)


// Grow the given buffer to fit the output.
dst = growBufferSize(dst, header.MarshalSize()+len(payload)+s.authTagLen())

Expand Down Expand Up @@ -100,6 +104,21 @@ func (s *srtpCipherAesCmHmacSha1) encryptRTP(dst []byte, header *rtp.Header, pay
return dst, nil
}

func (s *srtpCipherAesCmHmacSha1) encryptRTPNoOp(dst []byte, header *rtp.Header, payload []byte, roc uint32) (ciphertext []byte, err error) {
// Grow the given buffer to fit the output.
dst = growBufferSize(dst, header.MarshalSize()+len(payload))

// Copy the header unencrypted.
n, err := header.MarshalTo(dst)
if err != nil {
return nil, err
}

copy(dst[n:], payload)

return dst, nil
}

func (s *srtpCipherAesCmHmacSha1) decryptRTP(dst, ciphertext []byte, header *rtp.Header, roc uint32) ([]byte, error) {
// Split the auth tag and the cipher text into two parts.
actualTag := ciphertext[len(ciphertext)-s.authTagLen():]
Expand Down