OpenSSL "rsautl -encrypt" - Encryption with RSA Public Key
Q
How to encrypt a file with an RSA public key using OpenSSL "rsautl" command?
✍: FYIcenter.com
A
If you want to encrypt a file with an RSA public in order to
send private message to the owner of the public key,
you can use the OpenSSL "rsault -encrypt" command as shown below:
C:\Users\fyicenter>type clear.txt
The quick brown fox jumped over the lazy dog.
C:\Users\fyicenter>\local\openssl\openssl.exe
OpenSSL> rsautl -encrypt -pubin -inkey my_rsa_pub.key -in clear.txt
-out cipher.txt
OpenSSL> exit
C:\Users\fyicenter>dir *.txt
128 cipher.txt
45 clear.txt
Options used in the "rsautl" command are:
- "-encrypt" - Encrypt the input data with RSA keys.
- "-pubin" - Use RSA public key.
- "-inkey my_rsa_pub.key" - Read RSA key, the public key, from the given file.
- "-in clear.txt" - Read input data, the clear text, from the given file.
- "-out cipher.txt" - Save output data, the cipher text, to the given file.
Note that the encrypted data, cipher.txt, can only be decrypted by the owner of the public key with his/her matching private key.
⇒ OpenSSL "rsautl -decrypt" - Decryption with RSA Private Key
⇐ OpenSSL "rsautl" Command Options
2017-06-11, 3276👍, 0💬
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