Task 1 Verify library hash 
- Look at https://www.openssl.org/source/openssl-1.1.1q.tar.gz 
- Download library and corresponding sha256 hash 
	wget https://www.openssl.org/source/openssl-1.1.1q.tar.gz
	wget https://www.openssl.org/source/openssl-1.1.1q.tar.gz.sha256

- Compute hash 
	sha256sum openssl-1.1.1q.tar.gz
	openssl dgst -sha256 openssl-1.1.1q.tar.gz 
- Verify integrity 
	cat openssl-1.1.1q.tar.gz.sha256

Task 2 EC key-pair generation
- Execute commands
	openssl genpkey -algorithm EC -outform PEM -pkeyopt ec_paramgen_curve:P-256 -pkeyopt ec_param_enc:named_curve -out ECpriv.pem
	openssl pkey -pubout -inform PEM -outform PEM -in ECpriv.pem -out ECpub.pem
	openssl pkey -pubin -pubout -inform PEM  -outform DER -in ECpub.pem -out ECpub.der
- check the content of ECpub.pem, ECpub.der, ECpriv.pem

Task 3 RSA key-pair generation
- Execute commands
	openssl genpkey -algorithm RSA  -outform PEM -pkeyopt rsa_keygen_bits:2048 -pkeyopt rsa_keygen_pubexp:3 -out RSApriv.pem
	openssl pkey -pubout -inform PEM -outform PEM -in RSApriv.pem -out RSApub.pem
	openssl pkey -pubin -pubout -inform PEM  -outform DER -in RSApub.pem -out RSApub.der
- check the content of RSApub.pem,  RSApub.der, RSApriv.pem


Task 4 Key details 
- Execute commands
	openssl pkey -inform PEM -text -in ECpriv.pem
	openssl pkey -pubin -inform PEM -text -in ECpub.pem
	openssl pkey -inform PEM -text -in RSApriv.pem
	openssl pkey -pubin -inform PEM -text -in RSApub.pem
	openssl pkey -pubin -inform DER -text -in RSApub.der


Task 5 DER parsing
- Execute  
	openssl asn1parse -inform DER -in RSApub.der
- Replace ?? by appropriate offset to see modulus and exponent
openssl asn1parse -inform DER -in RSApub.der -strparse ??

Task 6 Bonus
- Check (and copy) one of the installed certificates 
cat /etc/ssl/certs/ISRG_Root_X1.pem
cp /etc/ssl/certs/ISRG_Root_X1.pem ISRG_Root_X1.pem 
- Execute 
openssl x509 -inform PEM -in ISRG_Root_X1.pem -noout -text