API: Use u8 instead of hex str #327

Job	Run time
check-style	20s
unit-tests (crypto-hacspec, ead-none)	58s
unit-tests (crypto-hacspec, ead-zeroconf)	1m 1s
unit-tests (crypto-psa, ead-none)	1m 8s
unit-tests (crypto-psa, ead-zeroconf)	1m 38s
build-coap-example	1m 29s
build-static-lib-and-headers (crypto-psa-baremetal)	1m 49s
build-edhoc-package (crypto-hacspec, ead-none)	1m 36s
build-example-for-cortex-m4 (crypto-psa, ead-none)	1m 58s
build-static-lib-and-headers (crypto-cryptocell310)	1m 33s
build-edhoc-package (crypto-hacspec, ead-zeroconf)	1m 38s
build-example-for-cortex-m4 (crypto-psa, ead-zeroconf)	2m 8s
generate-fstar	0s
build-edhoc-package (crypto-psa, ead-none)	1m 38s
build-example-for-cortex-m4 (crypto-cryptocell310, ead-none)	2m 3s
run-example-on-qemu (crypto-psa, ead-none)	2m 0s
build-edhoc-package (crypto-psa, ead-zeroconf)	2m 6s
build-example-for-cortex-m4 (crypto-cryptocell310, ead-zeroconf)	2m 6s
run-example-on-qemu (crypto-psa, ead-zeroconf)	2m 14s
build-edhoc-package (crypto-psa-baremetal, ead-none)	2m 51s
build-edhoc-package (crypto-psa-baremetal, ead-zeroconf)	1m 46s
build-edhoc-package (crypto-cryptocell310, ead-none)	2m 19s
build-edhoc-package (crypto-cryptocell310, ead-zeroconf)	1m 40s
release	0s
	37m 59s

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