it("demonstrating how to use derived keys for signature", function () {
var options = options_AES_128_CBC;
var derivedKeys = crypto_utils.computeDerivedKeys(secret, seed, options);
var clear_message = make_lorem_ipsum_buffer();
var signature = crypto_utils.makeMessageChunkSignatureWithDerivedKeys(clear_message, derivedKeys);
signature.length.should.eql(20);
var signed_message = Buffer.concat([clear_message, signature]);
crypto_utils.verifyChunkSignatureWithDerivedKeys(signed_message, derivedKeys).should.equal(true);
// let's corrupt the message ...
signed_message.write("HELLO", 0x50);
// ... and verify that signature verification returns a failure
crypto_utils.verifyChunkSignatureWithDerivedKeys(signed_message, derivedKeys).should.equal(false);
});
options.signingFunc = function (chunk) {
return crypto_utils.makeMessageChunkSignatureWithDerivedKeys(chunk, derivedKeys);
};