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Finally I solved! Ipost the orrect code, perhaps it can help someone. There were two problems: the first was that I was not calling the methods inside the main, the second was that I should rename...

I did some little changes and removed comments and tryed to print kSigning. Follows the code and error message. It seems that I'm not able to call the two methods inside the main.

Java code
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I'm using eclipse: there is no error but nothing shown on console.

Hi, I have to derive the signing key (encyption mode hmac sha256) for an aws project. This is my problem, but something is going wrong I think because I'm not able to call the two methods at the end...