Function SetupCipher

modules/crypt/ssl/ssl_setup.js:93–134

(session, connectionEnd)

}

function SetupCipher(session, connectionEnd)
{
	var random = session.serverRandom;
	random = random.concat(session.clientRandom);
	var chosenCipher = session.chosenCipher;
	var macSize = chosenCipher.encryptionMode == GCM ? 0 : chosenCipher.hashSize;
	var ivSize = session.protocolVersion <= 0x301 ? chosenCipher.cipherBlockSize : (chosenCipher.saltSize || 0);
	var nbytes = chosenCipher.cipherKeySize * 2 + macSize * 2 + ivSize * 2;
	var keyBlock = PRF(session, session.masterSecret, "key expansion", random, nbytes);
	var s = new SSLStream(keyBlock);
	var o = {};
	if (connectionEnd) {
		if (macSize > 0) {
			o.macSecret = s.readChunk(macSize);
			void s.readChunk(macSize);
		}
		o.key = s.readChunk(chosenCipher.cipherKeySize);
		void s.readChunk(chosenCipher.cipherKeySize);
		if (ivSize > 0)
			o.iv = s.readChunk(ivSize);
		else
			o.iv = undefined;
		setupSub(o, chosenCipher);
		session.clientCipher = o;
	}
	else {
		if (macSize > 0) {
			void s.readChunk(macSize);
			o.macSecret = s.readChunk(macSize);
		}
		void s.readChunk(chosenCipher.cipherKeySize);
		o.key = s.readChunk(chosenCipher.cipherKeySize);
		if (ivSize > 0) {
			void s.readChunk(ivSize);
			o.iv = s.readChunk(ivSize);
		}
		else
			o.iv = undefined;
		setupSub(o, chosenCipher);
		session.serverCipher = o;
	}
}

export default SetupCipher;