Add wait_on_channels_with_downgrade to SDK

[ipetr0v]

This change adds:

• wait_on_channels_with_downgrade to ABI, SDK andRuntime

Fixes #1736

[ipetr0v]

Currently is blocked by #1837 since it implements abitest signing.

[tiziano88]

just checking: do we need this for anything in particular (and similarly for read_with_downgrade)?

[ipetr0v]

Examples currently don't use these functions.
This is just remaining logic necessary for IFCv0.

[tiziano88]

Examples currently don't use these functions.
This is just remaining logic necessary for IFCv0.

I don't remember it being necessary for anything in particular, definitely not for IFCv0, in fact #1736 is added to IFCv1, but I am not even sure we should do it at all unless we have a use case for it, or do you have anything in mind?

[tiziano88]

(BTW similar argument for #1837)

[ipetr0v]

This PR just completes the with_downgrade SDK that has already been started (write_with_downgrage, node_create_with_downgrade).
So that we have a full SDK

[ipetr0v]

Also this PR adds wait_with_downgrade that should be used by Receiver::receive_with_downgrade instead of just wait:

oak/sdk/rust/oak/src/io/receiver.rs

Lines 164 to 167 in 490a3e8

	fn receive_with_downgrade(&self) -> Result<T, OakError> {
	self.wait()?;
	self.try_receive_with_downgrade()
	}

[github-actions]

Reproducibility Index:

faf7091d124a520c114b6523820f3b1f12eb50b341955fa38b6fcc300684ea10  ./examples/abitest/bin/abitest_0_frontend.wasm
5384945ff4d67d758e15f0ece0550f59aef877e3fef37907b749da3b2519c21f  ./examples/abitest/bin/abitest_1_backend.wasm
8f907b548339324bdbc87894714806facbbd225a5798b557b2001c2b493b0c52  ./examples/abitest/bin/abitest_linear_handles.wasm
cda3674646ebf25e5b34a15ded9c8dca78f7a8361cdbbb43b75b07fe92430382  ./examples/aggregator/bin/aggregator.wasm
ef447cdfda3b6d78ee518722ac3270609bc602a6c7cfd197fa82e9070b3ccd3e  ./examples/chat/bin/chat.wasm
d812f9b3a7c867be2df853f3061647c8e9a9b9fbcef4a39daaf5da33a53c1bb3  ./examples/hello_world/bin/hello_world.wasm
18c03f19c64a0e487e0a118743a0a2e1df16a87e41cd8530a523da4027a90bef  ./examples/hello_world/bin/translator.wasm
3d7bbf45681b499be9ee8daf55cd029ce749dd7f9113bdb0403da8b8d3d17a2c  ./examples/http_server/bin/http_server.wasm
9409a53f823a9febd7a2bc16677de093479880acd7da1a34ea79278972b53dc6  ./examples/injection/bin/injection.wasm
8efff73b9a678970664770512d97c191fb3c9397124439abe72e5b304b999e43  ./examples/private_set_intersection/bin/private_set_intersection.wasm
abf0475fe00c584096f16fd340dd822c1d6879b54adc912406902e7b0b035a43  ./examples/private_set_intersection/bin/private_set_intersection_handler.wasm
c6a2919c06a536170d225e9bba5c9be97eaa5e800f57f62405972ed138064639  ./examples/proxy_attestation/bin/proxy_attestation_example.wasm
18c03f19c64a0e487e0a118743a0a2e1df16a87e41cd8530a523da4027a90bef  ./examples/translator/bin/translator.wasm
424eb245c92b2afc48a2027aceb274525be765048ab38d759900db47fa037a11  ./examples/trusted_database/bin/trusted_database.wasm
882b5a4172ea835a258ddf5738c98a04b376fbc31d67053a5e8f65e5bd7324f3  ./oak_loader/bin/oak_loader

Reproducibility Index diff:

diff --git a/reproducibility_index b/reproducibility_index
index a8f1316..4b3015e 100644
--- a/reproducibility_index
+++ b/reproducibility_index
@@ -1,15 +1,15 @@
-ee8c08fbe8132e1d1f11ab0c811407c18a315625bfb24953d39beb858db173c4  ./examples/abitest/bin/abitest_0_frontend.wasm
-8400e545655f67486ea6fee06aaaae9cf2aadecefc3b4288dcb4bfb187db5d83  ./examples/abitest/bin/abitest_1_backend.wasm
-de915d71e5f77362f64eeb1924a349a3b8bc416e4d8bb8614913e2d96b432a10  ./examples/abitest/bin/abitest_linear_handles.wasm
-7a3d2479d81fe14c10f9874e5bfba1185b3c0d4f86b453fa01eed682aa305e50  ./examples/aggregator/bin/aggregator.wasm
-ad69eeeb74eed3a6185210cf4898749eed2d44617557d1327261774faa1e243c  ./examples/chat/bin/chat.wasm
-5edcb3c4a605d6a237a88e06d142b3796c388212895b3257e4eac1ac7c1c1d96  ./examples/hello_world/bin/hello_world.wasm
-24694ff8201d5a3488366c0f86bb81cad8dfedca72fa0559a6820c656027986f  ./examples/hello_world/bin/translator.wasm
-7c0855819b0c188f1a83478868915fe847fe8b847108ccc30a93c5110cb95fde  ./examples/http_server/bin/http_server.wasm
-9d7987628d9a520c64794dba9b76ee597d9b3f93b46186c01fc00bd7e24606fe  ./examples/injection/bin/injection.wasm
-fe327b49cc0ddcf6237952fa962e3a20d3293d7a5d063857cb3f01a5cce77d35  ./examples/private_set_intersection/bin/private_set_intersection.wasm
-d70324138043c16ea812fbd6ce3a75a82aea7a97d13de4570c790d4ab1dda903  ./examples/private_set_intersection/bin/private_set_intersection_handler.wasm
-97f5455a87aa2de4a401a75e8c12a8b49dc3e732d3b85bc8688f5386ad3e54a5  ./examples/proxy_attestation/bin/proxy_attestation_example.wasm
-24694ff8201d5a3488366c0f86bb81cad8dfedca72fa0559a6820c656027986f  ./examples/translator/bin/translator.wasm
-4d2bbcd612282243e85331c187d8f9004779e5724e8c02bdf8f93339ad9bd485  ./examples/trusted_database/bin/trusted_database.wasm
-dcfd1aec80c6482e1e1c1dcb0846d0abf11f5531bf1c2b434e84f128e010ccdd  ./oak_loader/bin/oak_loader
+faf7091d124a520c114b6523820f3b1f12eb50b341955fa38b6fcc300684ea10  ./examples/abitest/bin/abitest_0_frontend.wasm
+5384945ff4d67d758e15f0ece0550f59aef877e3fef37907b749da3b2519c21f  ./examples/abitest/bin/abitest_1_backend.wasm
+8f907b548339324bdbc87894714806facbbd225a5798b557b2001c2b493b0c52  ./examples/abitest/bin/abitest_linear_handles.wasm
+cda3674646ebf25e5b34a15ded9c8dca78f7a8361cdbbb43b75b07fe92430382  ./examples/aggregator/bin/aggregator.wasm
+ef447cdfda3b6d78ee518722ac3270609bc602a6c7cfd197fa82e9070b3ccd3e  ./examples/chat/bin/chat.wasm
+d812f9b3a7c867be2df853f3061647c8e9a9b9fbcef4a39daaf5da33a53c1bb3  ./examples/hello_world/bin/hello_world.wasm
+18c03f19c64a0e487e0a118743a0a2e1df16a87e41cd8530a523da4027a90bef  ./examples/hello_world/bin/translator.wasm
+3d7bbf45681b499be9ee8daf55cd029ce749dd7f9113bdb0403da8b8d3d17a2c  ./examples/http_server/bin/http_server.wasm
+9409a53f823a9febd7a2bc16677de093479880acd7da1a34ea79278972b53dc6  ./examples/injection/bin/injection.wasm
+8efff73b9a678970664770512d97c191fb3c9397124439abe72e5b304b999e43  ./examples/private_set_intersection/bin/private_set_intersection.wasm
+abf0475fe00c584096f16fd340dd822c1d6879b54adc912406902e7b0b035a43  ./examples/private_set_intersection/bin/private_set_intersection_handler.wasm
+c6a2919c06a536170d225e9bba5c9be97eaa5e800f57f62405972ed138064639  ./examples/proxy_attestation/bin/proxy_attestation_example.wasm
+18c03f19c64a0e487e0a118743a0a2e1df16a87e41cd8530a523da4027a90bef  ./examples/translator/bin/translator.wasm
+424eb245c92b2afc48a2027aceb274525be765048ab38d759900db47fa037a11  ./examples/trusted_database/bin/trusted_database.wasm
+882b5a4172ea835a258ddf5738c98a04b376fbc31d67053a5e8f65e5bd7324f3  ./oak_loader/bin/oak_loader