node-privatedatacommunicationprotocol

Implementation in NodeJs of privatedatacommunicationprotocol from Google https://code.google.com/p/privatedatacommunicationprotocol/

needed for https://developers.google.com/ad-exchange/rtb/response-guide/decrypt-price

Installation

	npm install privatedatacommunicationprotocol
	

Example

	var assert = require("assert");
	var PDCP = require("privatedatacommunicationprotocol");

	var e_key = new Buffer([
	  0xb0, 0x8c, 0x70, 0xcf, 0xbc, 0xb0, 0xeb, 0x6c,
	  0xab, 0x7e, 0x82, 0xc6, 0xb7, 0x5d, 0xa5, 0x20,
	  0x72, 0xae, 0x62, 0xb2, 0xbf, 0x4b, 0x99, 0x0b,
	  0xb8, 0x0a, 0x48, 0xd8, 0x14, 0x1e, 0xec, 0x07
	]);
	var i_key = new Buffer([
	  0xbf, 0x77, 0xec, 0x55, 0xc3, 0x01, 0x30, 0xc1,
	  0xd8, 0xcd, 0x18, 0x62, 0xed, 0x2a, 0x4c, 0xd2,
	  0xc7, 0x6a, 0xc3, 0x3b, 0xc0, 0xc4, 0xce, 0x8a,
	  0x3d, 0x3b, 0xbd, 0x3a, 0xd5, 0x68, 0x77, 0x92
	]);

	var iv = new Buffer([
	  0xd8, 0xcd, 0x18, 0x62, 0xed, 0x2a, 0x4c, 0xd2,
	  0x3d, 0x3b, 0xbd, 0x3a, 0xd5, 0x68, 0x77, 0x92
	]);

	var price = 15000000;

	// PDCP.crypt = function(e_key, i_key, price, iv)
	// iv		initialization vector (16 bytes - unique to the impression)
	// e_key	encryption key (32 bytes - provided at account set up)
	// i_key	integrity key (32 bytes - provided at account set up)
	// price	(8 bytes - in micros of account currency)
	var enc_price = PDCP.crypt(e_key, i_key, price, iv);


	// PDCP.decrypt = function(e_key, i_key, final_message)
	// e_key	encryption key, 32 bytes - provided at account set up
	// i_key	integrity key, 32 bytes - provided at account set up
	// final_message	38 characters web-safe base64 encoded
	var dec_price = PDCP.decrypt(e_key, i_key, enc_price);

	assert.equal(price, dec_price);