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with_rsa.rb

This Ruby code snippet demonstrates RSA encryption and decryption using the openssl library. It generates a 2048-bit RSA key pair (private and public keys). A string “Ruby” is encrypted using the public key and then successfully decrypted using the corresponding private key, showcasing the basic functionality of asymmetric encryption.

Ruby code snippet

require 'openssl'
#=> true

rsa_private = OpenSSL::PKey::RSA.generate(2048)
#=> #<OpenSSL::PKey::RSA:0x00007f4b93766390 oid=rsaEncryption>
rsa_public = rsa_private.public_key
#=> #<OpenSSL::PKey::RSA:0x00007f4b93761b38 oid=rsaEncryption>

secret = 'Ruby'
#=> "Ruby"

enc_data = rsa_public.public_encrypt(secret)
#=> 
"\x8C\xDFv\xD3b\xE5G3\xD2fl{}M\xE9\r\xEC\x90\xF5\xE2\xCC\xBFR\x00W{\xDC\"7>?3}C\...

rsa_private.private_decrypt(enc_data)
#=> "Ruby"

Executed with Ruby 3.4.5.