8.2. Key Management parameters
8.2. Key Management parameters
The table below lists all SRTP parameters that key management can supply. For reference, it also provides a summary of the default and mandatory-to-support values for an SRTP implementation as described in Section 5.
| Parameter | Mandatory-to-support | Default |
|---|---|---|
| SRTP and SRTCP encr transf. (Other possible values: AES_f8) | AES_CM, NULL | AES_CM |
| SRTP and SRTCP auth transf. | HMAC-SHA1 | HMAC-SHA1 |
| SRTP and SRTCP auth params: n_tag (tag length) SRTP prefix_length | 80 0 | 80 0 |
| Key derivation PRF | AES_CM | AES_CM |
| Key material params (for each master key): master key length n_e (encr session key length) n_a (auth session key length) master salt key length of the master salt n_s (session salt key length) key derivation rate | 128 128 160 112 112 0 | 128 128 160 112 112 0 |
| key lifetime SRTP-packets-max-lifetime SRTCP-packets-max-lifetime from-to-lifetime <From, To> | 2^48 2^31 | 2^48 2^31 |
| MKI indicator length of the MKI value of the MKI | 0 0 | 0 0 |
| Crypto context index params: SSRC value ROC SEQ SRTCP Index Transport address Port number | ||
| Relation to other RTP profiles: sender's order between FEC and SRTP (see Section 10) | FEC-SRTP | FEC-SRTP |