Adding functions for message_4 #1143

Job	Run time
check-style	21s
generate-fstar	2m 19s
unit-tests-default	53s
unit-tests (lakers-crypto/psa, ead-none)	1m 3s
test-lakers-python	1m 22s
unit-tests (lakers-crypto/psa, ead-authz)	1m 4s
unit-tests (lakers-crypto/rustcrypto, ead-none)	42s
unit-tests (lakers-crypto/rustcrypto, ead-authz)	42s
build-lakers-c (crypto-rustcrypto)	1m 10s
build-edhoc-package (lakers-crypto/psa)	1m 28s
build-lakers-c (crypto-psa-baremetal)	2m 3s
build-coap-example	50s
build-edhoc-package (lakers-crypto/psa-baremetal)	1m 16s
build-lakers-c (crypto-cryptocell310)	1m 13s
build-edhoc-package (lakers-crypto/cryptocell310)	1m 13s
build-edhoc-package (lakers-crypto/rustcrypto)	1m 8s
build-example-for-cortex-m4 (crypto-psa)	1m 42s
build-lakers-c-example	1m 34s
run-example-on-qemu (crypto-psa)	1m 28s
build-example-for-cortex-m4 (crypto-cryptocell310)	1m 17s
release	0s
	24m 48s

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