CA1850.md

Pattern: Missing use of HashData()

Issue: -

Description

It's more efficient to use static HashData methods than to create and manage a HashAlgorithm instance to call ComputeHash.

Static HashData methods were introduced in .NET 5 on the following types:

• MD5
• SHA1
• SHA256
• SHA384
• SHA512

Example of incorrect code:

public bool CheckHash(byte[] buffer)
{
  using (var sha256 = SHA256.Create())
  {
    byte[] digest = sha256.ComputeHash(buffer);
    return DoesHashExist(digest);
  }
}

Example of correct code:

public bool CheckHash(byte[] buffer)
{
    byte[] digest = SHA256.HashData(buffer);
    return DoesHashExist(digest);
}

Further Reading

• CA1850