RSA

rsa.txt

// Generate private.pem
openssl genrsa -out private.pem 512

// Generate public.pem
openssl rsa -in private.pem  -pubout > public.pem

// Encrypt
openssl rsautl -in text.txt -out secret.enc -pubin -inkey public.pem -encrypt

// Decrypt
openssl rsautl -in secret.enc -out secret.dec -inkey private.pem -decrypt

//PCKS1 padding sign file
openssl dgst -sha1 -sign private.pem -out sha1.sign text.txt

// Verify signature
openssl dgst -sha1 -verify public.pem -signature sha1.sign text.txt