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Class

An implementation of the Diffie-Hellman key exchange protocol based on discrete logarithms in finite fields, the same basis that DSA is built on.

Accessor methods for the Diffie-Hellman parameters

  • DH#p

The prime (an OpenSSL::BN) of the Diffie-Hellman parameters.

  • DH#g

The generator (an OpenSSL::BN) g of the Diffie-Hellman parameters.

  • DH#pub_key

The per-session public key (an OpenSSL::BN) matching the private key. This needs to be passed to #compute_key.

  • DH#priv_key

The per-session private key, an OpenSSL::BN.

Example of a key exchange

dh1 = OpenSSL::PKey::DH.new(2048)
der = dh1.public_key.to_der #you may send this publicly to the participating party
dh2 = OpenSSL::PKey::DH.new(der)
dh2.generate_key! #generate the per-session key pair
symm_key1 = dh1.compute_key(dh2.pub_key)
symm_key2 = dh2.compute_key(dh1.pub_key)

puts symm_key1 == symm_key2 # => true
generate_key!

dh.generate_key! â self Instance Public methods Generates a private and public

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to_text

dh.to_text â aString Instance Public methods Prints all parameters of key to

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params_ok?

dh.check_params â true | false Instance Public methods Validates the Diffie-Hellman

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params

dh.params â hash Instance Public methods Stores all parameters of key to the

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