public-key-cryptography-demo.txt

# public-key cryptography demo for Mac or Linux

# create the private key - require a pass phrase
# openssl genrsa -aes256 -out sec-cert.pem 2048

# create the private key - no pass phrase required
openssl genrsa -out sec-cert.pem 2048

# create public key (PEM)
openssl rsa -in sec-cert.pem -outform PEM -pubout -out sec-cert.pub.pem

echo "This is a message that will be encrypted with my public key..." >> myMessage.txt

# encrypt the text file
openssl rsautl -encrypt -pubin -inkey sec-cert.pub.pem -oaep -in myMessage.txt -out myEncryptedMessage.txt
cat myEncryptedMessage.txt

# decrypt the text file
openssl rsautl -decrypt -inkey sec-cert.pem -oaep -in myEncryptedMessage.txt -out myDecryptedMessage.txt
cat myDecryptedMessage.txt