Okay, I've read the articles, but somehow I don't know where to start. I 
have to use the public key, generated out of x and y, algorith brainpool, 
to encrypt a JWT. The JWT is generated with the cpp-jwt library and now I 
really don't know what to do. How can I "convert" the public key I got from

CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::PublicKey publicKey;
    publicKey.Initialize(CryptoPP::ASN1::brainpoolP256r1(), q);

to the needed byte array. What do I have to use as initialisation vector? 
I'm no pro in crypto-algorithms but I have to use them for a specific 
project -_- 

Jeffrey Walton schrieb am Samstag, 18. September 2021 um 15:29:40 UTC+2:

> On Fri, Sep 17, 2021 at 11:59 PM Benjamin Schäfer
> <skullm...@gmail.com> wrote:
> >
> > Correction: I have to encrypt the JWT, not sign it. Signing is with the 
> private key - which I don't have. I will take a look at the article and the 
> linking. Maybe that will bring some hints for me. Thanks again :)
> This may help if you need to verify signatures:
> https://www.cryptopp.com/wiki/JSON_Web_Signature
> Jeff

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