public byte[] GetEntropy()
{
lock (this)
{
byte[] nxt;
if (buf == null)
{
buf = entropySource.GetEntropy();
}
// FSM_STATE:5.1, "CONTINUOUS NDRBG TEST", "The module is performing Continuous NDRNG self-test"
// FSM_TRANS:5.1, "CONDITIONAL TEST", "CONTINUOUS NDRNG TEST", "Invoke Continuous NDRNG test"
nxt = entropySource.GetEntropy();
if (Arrays.AreEqual(nxt, buf))
{
CryptoStatus.MoveToErrorStatus("Duplicate block detected in EntropySource output");
}
// FSM_TRANS:5.2, "CONTINUOUS NDRNG TEST", "CONDITIONAL TEST", "Continuous NDRNG test successful"
Array.Copy(nxt, 0, buf, 0, buf.Length);
return(nxt);
}
}
internal static T Validate <T>(Algorithm algorithm, T parameters, IConsistencyTest <T> test)
{
try
{
if (!test.HasTestPassed(parameters))
{
CryptoStatus.MoveToErrorStatus(new ConsistencyTestFailedError("Consistency test failed", algorithm));
}
return(parameters);
}
catch (Exception e)
{
CryptoStatus.MoveToErrorStatus(new ConsistencyTestFailedError("Exception on consistency test: " + e.Message, algorithm));
}
return(default(T)); // we'll never get this far
}
internal static T Validate <T>(Algorithm algorithm, T engine, IBasicKatTest <T> test)
{
try
{
if (!test.HasTestPassed(engine))
{
CryptoStatus.MoveToErrorStatus(new SelfTestFailedError("Self test failed", algorithm));
}
return(engine);
}
catch (Exception e)
{
CryptoStatus.MoveToErrorStatus(new SelfTestFailedError("Exception on self test: " + e.Message, algorithm));
}
return(default(T)); // we'll never get this far
}
internal static T Validate <T>(Algorithm algorithm, T engine, VariantKatTest <T> test)
{
try
{
test.Evaluate(engine);
return(engine);
}
catch (TestFailedException e)
{
CryptoStatus.MoveToErrorStatus(new SelfTestFailedError(e.Message, algorithm));
}
catch (Exception e)
{
CryptoStatus.MoveToErrorStatus(new SelfTestFailedError("Exception on self test: " + e.Message, algorithm));
}
return(default(T)); // we'll never get this far
}
internal static void Validate(Algorithm algorithm, VariantInternalKatTest test)
{
try
{
if (!algorithm.Equals(test.Algorithm))
{
throw new TestFailedException("Inconsistent algorithm tag for " + algorithm);
}
test.Evaluate();
}
catch (TestFailedException e)
{
CryptoStatus.MoveToErrorStatus(new SelfTestFailedError(e.Message, algorithm));
}
catch (Exception e)
{
CryptoStatus.MoveToErrorStatus(new SelfTestFailedError("Exception on self test: " + e.Message, algorithm));
}
}
public int Generate(byte[] output, byte[] additionalInput, bool predictionResistant)
{
if (CryptoStatus.IsErrorStatus())
{
throw new CryptoOperationError(CryptoStatus.GetStatusMessage());
}
lock (this)
{
int rv;
if (block.Length != output.Length)
{
if (block.Length < output.Length)
{
block = new byte[GetTestBlockSize(output.Length)];
nextBlock = new byte[block.Length];
if (initialAdditionalInput != null)
{
rv = drbg.Generate(block, initialAdditionalInput, predictionResistant);
initialAdditionalInput = null;
}
else
{
rv = drbg.Generate(block, null, predictionResistant);
}
if (rv < 0)
{
CryptoStatus.MoveToErrorStatus("DRBG unable to initialise");
}
}
else if (block.Length != MIN_RESOLUTION)
{
byte[] tmp = new byte[GetTestBlockSize(output.Length)];
Array.Copy(block, block.Length - tmp.Length, tmp, 0, tmp.Length);
block = tmp;
nextBlock = new byte[GetTestBlockSize(output.Length)];
}
}
rv = drbg.Generate(nextBlock, additionalInput, predictionResistant);
if (rv < 0)
{
return(rv);
}
// FSM_STATE:5.2, "CONTINUOUS DRBG TEST", "The module is performing Continuous DRBG self-test"
// FSM_TRANS:5.3, "CONDITIONAL TEST", "CONTINUOUS DRBG TEST", "Invoke Continuous DRBG test"
if (areEqual(block, nextBlock, 0))
{
CryptoStatus.MoveToErrorStatus("Duplicate block detected in DRBG output");
}
// FSM_TRANS:5.4, "CONTINUOUS DRBG TEST", "CONDITIONAL TEST", "Continuous DRBG test successful"
// note we only return output bytes to output array when we are sure there is no issue.
Array.Copy(nextBlock, 0, output, 0, output.Length);
Array.Copy(nextBlock, 0, block, 0, block.Length);
}
if (CryptoStatus.IsErrorStatus())
{
throw new CryptoOperationError(CryptoStatus.GetStatusMessage());
}
return(output.Length);
}