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openSSL crypto library:

• documentation rsa
• documentation pkeyutl

	
 #!/bin/bash          
 
 # generate key
 openssl genrsa -out rsakey1024.txt 1024 

 # generate public key
 openssl rsa -in rsakey1024.txt -out publickey1024.txt -pubout
 
 # visualize the components rsa (-text)
 #openssl rsa -in rsakey1024.txt -text
 #openssl rsa -in publickey1024.txt -text -pubin

 
 # ENCRYPT: RSA 1024 bit

 openssl pkeyutl -encrypt -in plaintext.txt -out ciphertext.txt -inkey rsakey1024.txt


 # DECRYPT: RSA 1024 bit

 openssl pkeyutl -decrypt -in ciphertext.txt -out verification.txt -inkey rsakey1024.txt