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c#hashsha
haughtonomous
haughtonomous

Reputation: 4850

How do I specify the key for computing a SHA256 hash?

I have had a requirement handed to me to modify an existing application to compute the SHA256 hash of a message body (basically a large string) using a specific key (the key to be provided in the message header).

However in none of the .Net SHA256 classes (eg System.Security.Cryptography.SHA256Managed) can I find a reference to a Key property or anything like that.

Does anyone know how to do this in .Net? (This ideally has to be .Net3.5, which the application targets.)

TIA

Upvotes: 7

Views: 14836

Answers (2)

Ben Strawson
Ben Strawson

Reputation: 447

You've been asked to compute the Hash-based Message Authentication Code (HMAC) with SHA256. For this you will want to use the HMACSHA256 class - the documentation also includes an example of how to implement this.

Upvotes: 8

i486
i486

Reputation: 6563

There is no key for SHA256. It is hash function and returns the same value each time for the same input. This is not encryption with key.

Upvotes: 1

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