What’s coming in .NET 9

.NET 9 introduces a new one-shot hash method on the CryptographicOperations class. It also adds new classes that use the Keccak Message Authentication Code (KMAC) algorithm.

CryptographicOperations.HashData() method

One-shot APIs are preferable because they can provide the best possible performance and reduce or eliminate allocations. Examples of one-shot implementations of hash functions include SHA256.HashData and HMACSHA256.HashData.

The upcoming CryptographicOperations.HashData API will let you produce a hash as a one-shot where the algorithm used is determined by a HashAlgorithmName, as shown in the following code:

static void HashAndProcessData(HashAlgorithmName hashAlgorithmName, byte[] data)
{
  byte[] hash = CryptographicOperations.HashData(hashAlgorithmName, data);
  ProcessHash(hash);
}

KMAC algorithm

KMAC is a pseudorandom function and keyed hash function based on Keccak as specified by NIST SP-800-185. Four variations...