/// <summary>
/// Update the digest using the specified ByteBuffer. The digest is
/// updated using the {@code input.remaining()} bytes starting
/// at {@code input.position()}.
/// Upon return, the buffer's position will be equal to its limit;
/// its limit will not have changed.
/// </summary>
/// <param name="input"> the ByteBuffer
/// @since 1.5 </param>
protected internal virtual void EngineUpdate(ByteBuffer input)
{
if (input.HasRemaining() == false)
{
return;
}
if (input.HasArray())
{
sbyte[] b = input.Array();
int ofs = input.ArrayOffset();
int pos = input.Position();
int lim = input.Limit();
EngineUpdate(b, ofs + pos, lim - pos);
input.Position(lim);
}
else
{
int len = input.Remaining();
int n = JCAUtil.getTempArraySize(len);
if ((TempArray == null) || (n > TempArray.Length))
{
TempArray = new sbyte[n];
}
while (len > 0)
{
int chunk = System.Math.Min(len, TempArray.Length);
input.Get(TempArray, 0, chunk);
EngineUpdate(TempArray, 0, chunk);
len -= chunk;
}
}
}
/// <summary>
/// Updates the data to be signed or verified using the specified
/// ByteBuffer. Processes the {@code data.remaining()} bytes
/// starting at at {@code data.position()}.
/// Upon return, the buffer's position will be equal to its limit;
/// its limit will not have changed.
/// </summary>
/// <param name="input"> the ByteBuffer
/// @since 1.5 </param>
protected internal virtual void EngineUpdate(ByteBuffer input)
{
if (input.HasRemaining() == false)
{
return;
}
try
{
if (input.HasArray())
{
sbyte[] b = input.Array();
int ofs = input.ArrayOffset();
int pos = input.Position();
int lim = input.Limit();
EngineUpdate(b, ofs + pos, lim - pos);
input.Position(lim);
}
else
{
int len = input.Remaining();
sbyte[] b = new sbyte[JCAUtil.getTempArraySize(len)];
while (len > 0)
{
int chunk = System.Math.Min(len, b.Length);
input.Get(b, 0, chunk);
EngineUpdate(b, 0, chunk);
len -= chunk;
}
}
}
catch (SignatureException e)
{
// is specified to only occur when the engine is not initialized
// this case should never occur as it is caught in Signature.java
throw new ProviderException("update() failed", e);
}
}
