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• 3.1.2
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tu.crossing.JavaCryptographicArchitecture.3.1.2.source-code.MessageDigest.crysl Maven / Gradle / Ivy

SPEC java.security.MessageDigest

OBJECTS
	java.lang.String algorithm;
	byte preInputByte;
	byte[] preInput;
	int preOffset;
	int preLen;
	java.nio.ByteBuffer preInputByteBuffer;
	byte[] input;
	int offset;
	int len;
	byte[] output;
	
EVENTS
	g1: getInstance(algorithm);
	g2: getInstance(algorithm, _);
	Get := g1 | g2;

	u1: update(preInputByte);
	u2: update(preInput);
	u3: update(preInput, preOffset, preLen);
	u4: update(preInputByteBuffer);
	Update := u1 | u2 | u3 | u4;

	d1: output = digest();
	d2: output = digest(input);
	d3: digest(output, offset, len);
	DWOU := d2;
	DWU := d1 | d3;
	Digest := DWU | DWOU;

ORDER
	Get, (DWOU | (Update+, Digest))+

CONSTRAINTS
	algorithm in {"SHA-256", "SHA-384", "SHA-512"};
	length[preInput] >= preLen + preOffset;
	preOffset >= 0;
	preLen > 0;
	length[output] >= len + offset;
	offset >= 0;
	len > 0;

ENSURES
	generatedMessageDigest[this] after Get;
	digested[output, _];
	digested[output, input];