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Asked: 2026-05-16T00:31:11+00:00

I’m using the SHA1Managed class in my code, but this causes a problem when

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I’m using the SHA1Managed class in my code, but this causes a problem when I run it on a particular machine. I get this exception:

System.InvalidOperationException: This implementation is not part of the
Windows Platform FIPS validated cryptographic algorithms.

The problem is caused by SHA1Managed, which is not FIPS compliant.

Which .NET SHA1 class is FIPS complient?

(I could just try them all out, I guess, but I don’t have easy access to the problem machine, and I suspect I won’t be able to enable FIPS on my development machine. And I’m lazy.)

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1 Answer

  1. Editorial Team

    You might find this blog post helpful. HMACSHA1 is FIPS compliant.

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