internal static void ApprovedModeCheck(bool approvedMode, string algorithmName)
{
if (approvedMode != IsInApprovedOnlyMode())
{
if (approvedMode)
{
throw new CryptoUnapprovedOperationError("attempt to use approved instance in unapproved thread: " + algorithmName);
}
else
{
throw new CryptoUnapprovedOperationError("attempt to use unapproved instance in approved thread: " + algorithmName);
}
}
if (CryptoStatus.IsErrorStatus())
{
throw new CryptoOperationError(CryptoStatus.GetStatusMessage());
}
}
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);
}
