5. Default and mandatory-to-implement Transforms
5. Default and mandatory-to-implement Transforms
The default transforms also are mandatory-to-implement transforms in SRTP. Of course, "mandatory-to-implement" does not imply "mandatory-to-use". Table 1 summarizes the pre-defined transforms. The default values below are valid for the pre-defined transforms.
| mandatory-to-impl. | optional | default | |
|---|---|---|---|
| encryption | AES-CM, NULL | AES-f8 | AES-CM |
| message integrity | HMAC-SHA1 | - | HMAC-SHA1 |
| key derivation (PRF) | AES-CM | - | AES-CM |
Table 1: Mandatory-to-implement, optional and default transforms in SRTP and SRTCP.