CR-BA: Public Key Infrastructure Certificate Revocation Scheme Based on Blockchain and Accumulator

Algorithm 1

Generative algorithm, provemembership.

	Input: accValue, member, key
	Output: accValue′, witness
(1)	ChaincodeStub stub = ctx.getStub ();
(2)	byte[] ojectBytes = stub.getState (Accumulator.class.getSimpleName ());
(3)	Accumulator accValue = deserialize(ojectBytes); //deserialize the accumulator object
(4)	result ← Acc.verify (member); //verify that current certificate exists
(5)	accValue ← Acc.add(member); //add member to accumulator
(6)	witness = acc.proveMembership (sha256 (cert, n)); //compute new accumulator value and new revocation factor
(7)	SendBlockchainTransaction (accValue′); //update accValue to the blockchain
(8)	return accValue′, witness; //return revocation factor, and the accumulator value is saved to the blockchain