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.iem.BouncyCastle.3.1.3.source-code.RSADigestSigner.crysl Maven / Gradle / Ivy

SPEC org.bouncycastle.crypto.signers.RSADigestSigner

OBJECTS
	org.bouncycastle.crypto.Digest digest;
	org.bouncycastle.crypto.CipherParameters params;
	
	byte inputByte;
	byte[] inputBytes;
	int inputBytesOffset;
	int inputBytesLen;

	byte[] generatedSignature;
	
	byte[] signature;	
	boolean forSigning;
	
EVENTS
	c1: RSADigestSigner(digest);
	c2: RSADigestSigner(digest, _);
	Con := c1 | c2;
	
	i1: init(forSigning, params);
	Init := i1;
	
	u1: update(inputByte);
	u2: update(inputBytes, inputBytesOffset, inputBytesLen);
	Update := u1 | u2;
	
	s1: generatedSignature = generateSignature();
	Sign := s1;

	v1: verifySignature(signature);
	Verify := v1;
	
ORDER
	(Con, Init, Update+, (Sign | Verify))+
	
CONSTRAINTS
	length[inputBytes] >= inputBytesOffset + inputBytesLen;
	inputBytesOffset >= 0;
	inputBytesLen > 0;
	forSigning in {true} => noCallTo[Verify];
	forSigning in {false} => noCallTo[Sign];
		
REQUIRES
	generatedSHA256Digest[digest];
	generatedRSAKeyParameters[params] || generatedRSAPrivateCrtKeyParameters[params] || generatedECPublicKeyParameters[params];

ENSURES
	signed[generatedSignature] after Sign;
	verified[signature] after Verify;