Re: error in encrypt / Decrypt

On Mon, Sep 02, 2024 at 02:33:56PM +0530, chakka lokesh wrote:

> I'm working on a custom TLS Traffic simulator. I need to craft
> client/server hello along with implementation of encryption / decryption
> algorithms including SECP256R1, SECP384R1, SECP521R1, X25519, X448,
> FFDHE2048, FFDHE3072, FFDHE4096, FFDHE6144, FFDHE8192 till connection
> closure.

These are not encryption algorithms, they're discrete abelian groups
over which the discrete logarithm problem is believed to be
computationally infeasible (with classical, presently all, computers).

They support Diffie-Hellman key exchange.

> Started practicing sample programs. I've tried to understand the APIs. But
> they are very complicated and not able to find any sample programs in the
> man pages here https://docs.openssl.org/1.1.1/man3/
> As I'm a beginner, it will be great if you can help me with a good tutorial.

"There is no royal road to geometry." (Quote attributed to Euclid)

You're going to have to read some textbooks, and master some new
concepts.  Perhaps Scheier's Applied Cryptography, or some other
accessible alternative.

-- 
    Viktor.

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