[openssl-users] SHA256() to EVP_* ?

jonetsu jonetsu at teksavvy.com
Wed Apr 29 14:07:17 UTC 2015

Thanks for the comments.

> If you are implementing HMAC, perhaps for PBKDF2 (which does
> that prehash-if-too-long), I hope you mean the code does...

Yes it does.

The man page (the one online from OpenSSL project - SHA256.html)
gives a description using SHA1() which computes a message digest.
Being generally new to OpenSSL at that level, what is then the
difference between using, say, SHA1() vs. using SHA1_Init,
SHA1_Update and SHA1_Final ?  Is it only that the latter allows
for continuously add data until _Final is called ?

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