Adding functions for message_4 #1145

Job	Run time
check-style	15s
generate-fstar	2m 11s
test-lakers-python	56s
unit-tests-default	52s
unit-tests (lakers-crypto/psa, ead-none)	1m 4s
unit-tests (lakers-crypto/psa, ead-authz)	51s
unit-tests (lakers-crypto/rustcrypto, ead-none)	41s
unit-tests (lakers-crypto/rustcrypto, ead-authz)	45s
build-example-for-cortex-m4 (crypto-psa)	1m 27s
build-edhoc-package (lakers-crypto/psa)	1m 25s
build-example-for-cortex-m4 (crypto-cryptocell310)	1m 9s
build-lakers-c (crypto-rustcrypto)	1m 10s
build-edhoc-package (lakers-crypto/psa-baremetal)	1m 46s
build-coap-example	54s
build-edhoc-package (lakers-crypto/cryptocell310)	1m 6s
build-lakers-c (crypto-psa-baremetal)	1m 18s
build-lakers-c-example	1m 49s
build-edhoc-package (lakers-crypto/rustcrypto)	59s
build-lakers-c (crypto-cryptocell310)	1m 30s
run-example-on-qemu (crypto-psa)	1m 26s
release	0s
	23m 34s

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