Proposal for "Crypt_DiffieHellman"
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Implementation of the Diffie-Hellman Key Exchange cryptographic protocol in PHP5. The protocol enables two parties without any prior knowledge of each other to establish a secure shared secret key across an insecure channel of communication. This is useful in established a shared key for signing subsequent messages which can be used to authenticate the message as being sent by the newly associated party. This implementation has been designed to operate in two broad modes. Mode 1, the default, accepts public/private keys as a string (usually since they represent a large integer outside the 32bit range). Mode 2, accepts public/privae keys in their binary form and internally translates this into a usable number form using a BigInteger class. Both modes are also available when extracting a public key for sending to the other party. In addition, support is included for extracting the big-endian two's complement of the output binary values for all keys. Binary form is commonly used for transmitting key values across the wire. Included is a small BigInteger wrapper across BCMath and GMP. It is expected that if Math_BigInteger is upgraded to PHP5 for PEAR2 that this wrapper will be dropped. In the meantime it has no other function other than to support Diffie-Hellman operations. |
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