protected virtual bool TryHashData(ReadOnlySpan <byte> data, Span <byte> destination, HashAlgorithmName hashAlgorithm, out int bytesWritten)
{
// If this is an algorithm that we ship, then we can use the hash one-shot.
if (this is IRuntimeAlgorithm)
{
return(HashOneShotHelpers.TryHashData(hashAlgorithm, data, destination, out bytesWritten));
}
// If this is not our algorithm implementation, for compatibility purposes we need to
// call out to the HashData virtual.
byte[] result;
// Use ArrayPool.Shared instead of CryptoPool because the array is passed out.
byte[] array = ArrayPool <byte> .Shared.Rent(data.Length);
try
{
data.CopyTo(array);
result = HashData(array, 0, data.Length, hashAlgorithm);
}
finally
{
Array.Clear(array, 0, data.Length);
ArrayPool <byte> .Shared.Return(array);
}
if (destination.Length >= result.Length)
{
new ReadOnlySpan <byte>(result).CopyTo(destination);
bytesWritten = result.Length;
return(true);
}
bytesWritten = 0;
return(false);
}
private static void Extract(HashAlgorithmName hashAlgorithmName, int hashLength, ReadOnlySpan <byte> ikm, ReadOnlySpan <byte> salt, Span <byte> prk)
{
Debug.Assert(HashLength(hashAlgorithmName) == hashLength);
int written = HashOneShotHelpers.MacData(hashAlgorithmName, salt, ikm, prk);
Debug.Assert(written == prk.Length, $"Bytes written is {written} bytes which does not match output length ({prk.Length} bytes)");
}
/// <summary>
/// Verifies the signature of a hash value.
/// </summary>
public bool VerifyData(byte[] buffer, object halg, byte[] signature)
{
int calgHash = CapiHelper.ObjToHashAlgId(halg);
HashAlgorithmName hashAlgorithmName = CapiHelper.AlgIdToHashAlgorithmName(calgHash);
byte[] hashVal = HashOneShotHelpers.HashData(hashAlgorithmName, buffer);
return(VerifyHash(hashVal, calgHash, signature));
}
/// <summary>
/// Computes the hash value of a subset of the specified byte array using the
/// specified hash algorithm, and signs the resulting hash value.
/// </summary>
/// <param name="inputStream">The input data for which to compute the hash</param>
/// <param name="halg">The hash algorithm to use to create the hash value. </param>
/// <returns>The RSA signature for the specified data.</returns>
public byte[] SignData(Stream inputStream, object halg)
{
int calgHash = CapiHelper.ObjToHashAlgId(halg);
HashAlgorithmName hashAlgorithmName = CapiHelper.AlgIdToHashAlgorithmName(calgHash);
byte[] hashVal = HashOneShotHelpers.HashData(hashAlgorithmName, inputStream);
return(SignHash(hashVal, calgHash));
}
/// <summary>
/// Computes the hash value of a subset of the specified byte array using the
/// specified hash algorithm, and signs the resulting hash value.
/// </summary>
/// <param name="buffer">The input data for which to compute the hash</param>
/// <param name="offset">The offset into the array from which to begin using data</param>
/// <param name="count">The number of bytes in the array to use as data. </param>
/// <param name="halg">The hash algorithm to use to create the hash value. </param>
/// <returns>The RSA signature for the specified data.</returns>
public byte[] SignData(byte[] buffer, int offset, int count, object halg)
{
int calgHash = CapiHelper.ObjToHashAlgId(halg);
HashAlgorithmName hashAlgorithmName = CapiHelper.AlgIdToHashAlgorithmName(calgHash);
byte[] hashVal = HashOneShotHelpers.HashData(hashAlgorithmName, new ReadOnlySpan <byte>(buffer, offset, count));
return(SignHash(hashVal, calgHash));
}
protected override bool TryHashData(ReadOnlySpan <byte> data, Span <byte> destination, HashAlgorithmName hashAlgorithm, out int bytesWritten)
{
if (hashAlgorithm != HashAlgorithmName.SHA1)
{
throw new CryptographicException(SR.Cryptography_UnknownHashAlgorithm, hashAlgorithm.Name);
}
return(HashOneShotHelpers.TryHashData(hashAlgorithm, data, destination, out bytesWritten));
}
protected override byte[] HashData(Stream data, HashAlgorithmName hashAlgorithm)
{
if (hashAlgorithm != HashAlgorithmName.SHA1)
{
throw new CryptographicException(SR.Cryptography_UnknownHashAlgorithm, hashAlgorithm.Name);
}
return(HashOneShotHelpers.HashData(hashAlgorithm, data));
}
protected override byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm)
{
if (hashAlgorithm != HashAlgorithmName.SHA1)
{
throw new CryptographicException(SR.Cryptography_UnknownHashAlgorithm, hashAlgorithm.Name);
}
return(HashOneShotHelpers.HashData(hashAlgorithm, new ReadOnlySpan <byte>(data, offset, count)));
}
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));
return(HashOneShotHelpers.HashData(hashAlgorithm, new ReadOnlySpan <byte>(data, offset, count)));
}
protected override byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm)
{
if (hashAlgorithm != HashAlgorithmName.SHA1)
{
// Matching DSACryptoServiceProvider's "I only understand SHA-1/FIPS 186-2" exception
throw new CryptographicException(SR.Cryptography_UnknownHashAlgorithm, hashAlgorithm.Name);
}
return(HashOneShotHelpers.HashData(hashAlgorithm, new ReadOnlySpan <byte>(data, offset, count)));
}
protected virtual byte[] HashData(Stream data, HashAlgorithmName hashAlgorithm) => HashOneShotHelpers.HashData(hashAlgorithm, data);
protected virtual byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm) => HashOneShotHelpers.HashData(hashAlgorithm, new ReadOnlySpan <byte>(data, offset, count));
protected override bool TryHashData(ReadOnlySpan <byte> data, Span <byte> destination, HashAlgorithmName hashAlgorithm, out int bytesWritten) => HashOneShotHelpers.TryHashData(hashAlgorithm, data, destination, out bytesWritten);