$ openssl genpkey -algorithm RSA -out privatekey.pem -pkeyopt rsa_keygen_bits:1024
$ cat privatekey.pem
$ openssl rsa -pubout -in privatekey.pem -out publickey.pem 
$ cat publickey.pem
$ openssl rsa -text -in privatekey.pem 
$ openssl pkey -in publickey.pem -pubin -text
$ echo datatoencrypt > message.txt
$ openssl rsautl -encrypt -inkey publickey.pem -pubin -in message.txt -out message.rsa 
$ openssl rsautl -decrypt -inkey privatekey.pem -in message.rsa -out message.dec
$ cat message.dec 
$ openssl ecparam -list_curves
$ openssl ecparam -name secp256k1 -genkey -noout -out ec-privatekey.pem
$ cat ec-privatekey.pem
$ openssl ec -in ec-privatekey.pem -pubout -out ec-pubkey.pem 
$ cat ec-pubkey.pem
$ openssl ec -in ec-privatekey.pem -text -noout 
$ openssl ec -in ec-pubkey.pem -pubin -text -noout
$ openssl ecparam -name secp256k1 -out secp256k1.pem 
$ cat secp256k1.pem
$ openssl ecparam -in secp256k1.pem -text -param_enc explicit -noout    
$ echo -n 'Hello' | openssl dgst -sha256
$ echo -n 'hello' | openssl dgst -sha256
$ openssl dgst -sha256 message.txt 
$ openssl dgst -sha256 -sign privatekey.pem -out signature.bin message.txt  
$ ls -ltr 
$ cat signature.bin
$ openssl dgst -sha256 -verify publickey.pem -signature signature.bin message.txt
$ openssl dgst -sha256 -verify publickey.pem -signature someothersignature.bin message.txt
$ openssl ecparam -genkey -name secp256k1 -noout -out eccprivatekey.pem
$ cat eccprivatekey.pem
$ openssl ec -in eccprivatekey.pem -pubout -out eccpublickey.pem 
$ echo testing > testsign.txt
$ cat testsign.txt 
$ openssl dgst -ecdsa-with-SHA1 -sign eccprivatekey.pem testsign.txt > ecsign.bin  
$ openssl dgst -ecdsa-with-SHA1 -verify eccpublickey.pem -signature ecsign.bin testsign.txt 
$ openssl req -new -key eccprivatekey.pem -x509 -nodes -days 365 -out ecccertificate.pem
$ openssl x509 -in ecccertificate.pem -text -noout