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SPEC javax.crypto.KeyAgreement

OBJECTS
	java.lang.String algorithm;
	java.lang.String symmetricKeyAlgorithm;
	java.security.Key pubKey;
	java.security.Key privKey;
	javax.crypto.SecretKey sharedKey;
	boolean lastPhase;
	byte[] sharedSecretBuffer;
	int offset;
	java.security.spec.AlgorithmParameterSpec params;
	java.security.SecureRandom random;
	
EVENTS
	g1: getInstance(algorithm);
	g2: getInstance(algorithm, _);
	Get := g1 | g2;
    
	i1: init(privKey);
	i2: init(privKey, params);
	i3: init(privKey, params, random);
	i4: init(privKey, random);
	Init := i1 | i2 | i3 | i4;
    
	dp1: doPhase(pubKey, lastPhase);
	DoPhase := dp1;
    
	gs1: sharedSecretBuffer = generateSecret();
	gs2: generateSecret(sharedSecretBuffer, offset);
	GenSecretBuffer := gs1 | g2;
	
	gs3: sharedKey = generateSecret(symmetricKeyAlgorithm);
	GenSecret := gs3 | GenSecretBuffer;
    
ORDER
	Get, Init, DoPhase, GenSecretBuffer
	
CONSTRAINTS
	algorithm in {"DH", "DiffieHellman", "ECDH"};
	noCallTo[gs3];
	
REQUIRES
	randomized[random];
	generatedPrivkey[privKey];
	generatedPubkey[pubKey];
	algorithm in {"DiffieHellman", "DH"} => preparedDH[params];
	algorithm in {"ECDH"} => preparedEC[params];
    
ENSURES
	preparedKeyMaterial[sharedSecretBuffer] after GenSecretBuffer;