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#!/usr/bin/env bash
# SPDX-License-Identifier: BSD-3-Clause
set -eufx
# create EK
tpm2_createek -G ecc -c ek_rsa.ctx
# create AK with defined scheme/hash
tpm2_createak -C ek_rsa.ctx -G ecc -g sha256 -s ecdsa -c ak_rsa.ctx
# load the AK to persistent handle
HANDLE=$(tpm2_evictcontrol -c ak_rsa.ctx | cut -d ' ' -f 2 | head -n 1)
cat > testcert.conf << EOF
[ req ]
default_bits = 2048
encrypt_key = no
prompt = no
distinguished_name = req_dn
[ req_dn ]
countryName = GB
commonName = Common Name
EOF
# create a private key and then generate a self-signed certificate for it
openssl req -provider tpm2 -provider default -propquery '?provider=tpm2' \
-x509 -config testcert.conf -key handle:${HANDLE} -out testcert.pem
echo -n "this is some text" > testdata
# sign data, output MIME
# as the key is restricted to sha256, the -md parameter is not given
openssl cms -sign -provider tpm2 -provider default -propquery '?provider=tpm2' \
-nodetach -inkey handle:${HANDLE} -signer testcert.pem \
-in testdata -text -out testdata.sig
# verify signed data
openssl cms -verify -in testdata.sig -text -noverify -out testdata2
# compare the results
cmp testdata testdata2
# encrypt-decrypt cannot be tested as restricted signing keys cannot be used for decryption
# release persistent handle
tpm2_evictcontrol -c ${HANDLE}
rm ek_rsa.ctx ak_rsa.ctx testcert.conf testcert.pem testdata testdata2 testdata.sig
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