Der ehrgeizlose Programmierer

TINFM meaning „there is no fine manual“, of course. Just as with digest, Ruby’s openssl documentation is missing just the bits you’ll need to get started. In order to encrypt or decrypt something, you’ll first need to instantiate the approriate cipher:

        require 'openssl'
	cipher = OpenSSL::Cipher::Cipher.new NAME_OF_CIPHER

So how do I know the name of the cipher if it’s not documented? You’ll need to refer to the OpenSSL documentation, or refer to this handy list:

A list of the currently supported cipher strings, without the explanation can also be produced by calling OpenSSL::Cipher.ciphers

After you’ve instantiated the proper cipher, you tell it to either encrypt or decrypt, give it the key to use (and possibly an IV) and then pass in data using update:

	cipher.encrypt
	cipher.key = KEY_DATA
	ciphertext = cipher.update plaintext
	
	cipher.reset
	cipher.decrypt
	cipher.key = KEY_DATA
	plaintext = cipher.update plaintext

That’s all. Not really difficult, once you’ve pieced everything together.

This entry was posted on Dienstag, Juli 22nd, 2008 at 19:40 and is filed under Allgemein, Programming, ruby. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.