[TrouSerS-users] Hash update explanation

[Massimo Gaggiano]

Hi all,
I create an "HASH_SHA1" object and update its value two times,
consecutively.
Finally I get the hash value, only after the second update. Though I
don't know what does this digest come from.

Can you give me any explanation?

I did expect that the final hash value was the second input value's
digest but, evidently, I'm wrong.

Thank you very much.

Max

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[Ken Goldman]

The general crypto digest design pattern of "start-update-complete" is
that the result is a digest of the concatenation of all the "update"
messages, not a digest of the last message.

Post by Massimo Gaggiano
I create an "HASH_SHA1" object and update its value two times,
consecutively. Finally I get the hash value, only after the second
update. Though I don't know what does this digest come from.
Can you give me any explanation?
I did expect that the final hash value was the second input value's
digest but, evidently, I'm wrong.

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