make MKI a stream level setting #690
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Move "use_mki" from a per packet parameter to a stream wide value. When using MKI all master keys need to have a valid MKI id. Merge the MKI protect & unprotect functions. The MKI index is currently still passed per packet, this could also be moved up to stream level with a srtp_set_mki(ssrc) api as this is not likely to change per packet.
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This started as an attempt to merge the protect & unprotect api's but became a more fundamental change to have MKI as a mode rather than a per packet thing. The test vector was generated from the 2.5 branch. |
paulej
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Feb 5, 2024
RFC 3711 section-3.2.1 states that the use of MKI and the size of the MKI id must be fixed for the life time of stream. By moving the mki_size value along with mki_use value to the stream level allows this to be enforced for all keys. Added a unit test to verify it can not be changed via an update.
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paulej
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Feb 9, 2024
| { | ||
| srtp_err_status_t status = srtp_err_status_ok; | ||
| if (p->key != NULL) { | ||
| if (p->use_mki) { |
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Would a single key be a reason to not use MKI? Perhaps pointless, but illegal?
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I think we will end up removing the single key option in the policy, it was only left there for ABI compatibility when MKI was first added.
It is "illegal" today as the single key option does not contain a mki id.
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Move "use_mki" from a per packet parameter to a stream wide value. When using MKI all master keys need to have a valid MKI id.
Merge the MKI protect & unprotect functions. The MKI index is currently still passed per packet, this could also be moved up to stream level with a srtp_set_mki(ssrc) api as this is not likely to change per packet.