Package gnu.crypto.key.dh

An object that implements the IKeyPairCodec operations for the Raw format to use with Diffie-Hellman keypairs.

The basic version of the Diffie-Hellman key agreement is described in the Handbook of Applied Cryptography [HAC] as follows:

• An appropriate prime p and generator g of Z_p^* (2 <= g <= p-2) are selected and published.
• A and B each send the other one message over an open channel; as a result, they both can then compute a shared secret key K which they can use to protect their future communication.
• A chooses a random secret x, 1 <= x <= p-2, and sends B message (1) which is g^x mod p.
• B chooses a random secret y, 1 <= y <= p-2, and sends A message (2) which is g^y mod p.
• B receives message (1) and computes the shared key as K = (g^x)^y mod p.
• A receives message (2) and computes the shared key as K = (g^y)^x mod p.

RFC-2631 describes a Static-Static Mode of operations with Diffie-Hellman keypairs as follows:

 "In Static-Static mode, both the sender and the recipient have a
   static (and certified) key pair. 

This implementation is the receiver's part of the basic version of the Diffie-Hellman key agreement exchange (B in [HAC]).

This implementation is the sender's part of the basic version of the Diffie-Hellman key agreement exchange (A in [HAC]).

The ElGamal key agreement, also known as the half-certified Diffie-Hellman key agreement, is described in the Handbook of Applied Cryptography [HAC] as follows:

• A sends to B a single message allowing one-pass key agreement.
• A obtains an authentic copy of B's public key (p, g, yb), where yb = g**xb.
• A chooses a random integer x, 1 <= x <= p-2, and sends B the message g**x.

This implementation is the receiver's part of the ElGamal key agreement exchange (B in [HAC]).

This implementation is the sender's part of the ElGamal key agreement exchange (A in [HAC]).

A base asbtract class for both public and private Diffie-Hellman keys.

An implementation of a Diffie-Hellman keypair generator.

Reference:

1. Diffie-Hellman Key Agreement Method
   Eric Rescorla.

An implementation of the Diffie-Hellman private key.

Reference:

1. Diffie-Hellman Key Agreement Method
   Eric Rescorla.

An implementation of the Diffie-Hellman public key.

Reference:

1. Diffie-Hellman Key Agreement Method
   Eric Rescorla.

An implementation of the Diffie-Hellman parameter generation as defined in RFC-2631.

Reference:

1. Diffie-Hellman Key Agreement Method
   Eric Rescorla.