topic Re: Encrypt data to RSA SHA-256 algorithm in Application Development and Automation Discussions

Encrypt data to RSA SHA-256 algorithm

Former Member — Sat, 29 Jul 2017 00:13:36 GMT

Hi all,

for my current project i need to create a JWT (BASIS 7.02, no OAuth2 function available), so i have to compute the signature using SHA256withRSA (also known as RSASSA-PKCS1-V1_5-SIGN with the SHA-256 hash function).

Please, how can i do that ?

Please note that the CommonCryptoLib v8.5 is installed.

Thanks for any help,

Eric

Re: Encrypt data to RSA SHA-256 algorithm

Former Member — Sat, 29 Jul 2017 00:29:09 GMT

What have you tried? Are you sure it has to be JWT? If you look through the archives there are several detailed messages on how to step through this, including dealing with some documented bugs.

https://archive.sap.com/discussions/thread/3729755

https://blogs.sap.com/2015/09/08/implementing-sha2-sha256-type-certificate-in-sap-netweaver-70-for-java/

Re: Encrypt data to RSA SHA-256 algorithm

Former Member — Sat, 29 Jul 2017 09:10:09 GMT

Hi Steven,

yes sure, i need a JWT because i want to connect to Google DFP API and for this i need to setup up an OAuth2 authentication that is not native in my SAP system. So first step is to create a JWT.

For more information you can watch here : Using OAuth 2.0 for Server to Server Applications

Thanks

Re: Encrypt data to RSA SHA-256 algorithm

Former Member — Sat, 29 Jul 2017 09:11:31 GMT

Hi Steven,

yes sure, i need a JWT because i want to connect to Google DFP API and for this i need to setup up an OAuth2 authentication that is not native in my SAP system. So first step is to create a JWT.

For more information you can watch here : Using OAuth 2.0 for Server to Server Applications

Thanks

Re: Encrypt data to RSA SHA-256 algorithm

fabianlupa — Sat, 29 Jul 2017 16:47:51 GMT

As an approach: take a look into the /UI2/ packages. They had JSON serialization before it got added to BASIS so maybe there's some OAUTH code too.

Re: Encrypt data to RSA SHA-256 algorithm

Former Member — Sat, 29 Jul 2017 18:55:16 GMT

Hi Fabian,

sorry but i don't have this package. SAP_BASIS is realease 702 SP-Level 0016, old version 😞

Re: Encrypt data to RSA SHA-256 algorithm

Former Member — Fri, 18 Aug 2017 09:59:23 GMT

I think that method CALCULATE_HMAC_FOR_CHAR from class CL_ABAP_HMAC must be to use for compute, i can test it with algorithm 'SHA256' but with RSA SHA256, how can i do ?

Need help, please.