private static int GetHashSizeInBytes(HashAlgorithmName hashAlgorithm)
{
return(s_hashSizes.GetOrAdd(
hashAlgorithm,
alg =>
{
using (HashProviderCng hashProvider = new HashProviderCng(alg.Name, null))
{
return hashProvider.HashSizeInBytes;
}
}));
}
public static byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm)
{
// The classes that call us are sealed and their base class has checked this already.
Debug.Assert(data != null);
Debug.Assert(offset >= 0 && offset <= data.Length);
Debug.Assert(count >= 0 && count <= data.Length);
Debug.Assert(!string.IsNullOrEmpty(hashAlgorithm.Name));
using (var hashProvider = new HashProviderCng(hashAlgorithm.Name, null))
{
hashProvider.AppendHashData(data, offset, count);
return(hashProvider.FinalizeHashAndReset());
}
}
protected override byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm)
{
// we're sealed and the base should have checked this already.
Debug.Assert(data != null);
Debug.Assert(offset >= 0 && offset <= data.Length);
Debug.Assert(count >= 0 && count <= data.Length);
Debug.Assert(!string.IsNullOrEmpty(hashAlgorithm.Name));
using (HashProviderCng hashProvider = new HashProviderCng(hashAlgorithm.Name, null))
{
hashProvider.AppendHashData(data, offset, count);
byte[] hash = hashProvider.FinalizeHashAndReset();
return(hash);
}
}
public static bool TryHashData(ReadOnlySpan <byte> source, Span <byte> destination, HashAlgorithmName hashAlgorithm, out int bytesWritten)
{
Debug.Assert(!string.IsNullOrEmpty(hashAlgorithm.Name));
using (var hashProvider = new HashProviderCng(hashAlgorithm.Name, null))
{
if (destination.Length < hashProvider.HashSizeInBytes)
{
bytesWritten = 0;
return(false);
}
hashProvider.AppendHashData(source);
return(hashProvider.TryFinalizeHashAndReset(destination, out bytesWritten));
}
}
protected override byte[] HashData(Stream data, HashAlgorithmName hashAlgorithm)
{
// We're sealed and the base should have checked these already.
Debug.Assert(data != null);
Debug.Assert(!string.IsNullOrEmpty(hashAlgorithm.Name));
using (HashProviderCng hashProvider = new HashProviderCng(hashAlgorithm.Name, null))
{
// Default the buffer size to 4K.
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = data.Read(buffer, 0, buffer.Length)) > 0)
{
hashProvider.AppendHashData(buffer, 0, bytesRead);
}
byte[] hash = hashProvider.FinalizeHashAndReset();
return(hash);
}
}
public static byte[] HashData(Stream data, HashAlgorithmName hashAlgorithm)
{
// The classes that call us are sealed and their base class has checked this already.
Debug.Assert(data != null);
Debug.Assert(!string.IsNullOrEmpty(hashAlgorithm.Name));
using (var hashProvider = new HashProviderCng(hashAlgorithm.Name, null))
{
// Default the buffer size to 4K.
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = data.Read(buffer, 0, buffer.Length)) > 0)
{
hashProvider.AppendHashData(buffer, 0, bytesRead);
}
byte[] hash = hashProvider.FinalizeHashAndReset();
return(hash);
}
}
