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  • Posts: 1

Topic: RSA 2048 bit signature generation & verification

Hello team, I am trying to use RSA-2048 based Signature generation & Verification using wolfssl on s32k144EVB. So I used wolfssl source files from NXP folder found under design studio installation & built it as static library. I have attached the user_settings.h file for which i'm building the application. I'm getting stack smashing error when generating signature for data. "unsigned char* privKey" is der pkcs1 key 2048bit , "size_t privKeyLen" is the sizeof privKey byte array is 1218 bytes. Also i've attached the test application source file here. Requesting your help with this issue. I am using below wolfssl functions in order.
1.ret = wc_InitRng(&rng);
2.ret = wc_InitRsaKey(&rsaKey, NULL);
3.ret = wc_RsaPrivateKeyDecode(privKey, &idx, &rsaKey, (word32)privKeyLen);
4.ret = wc_Sha256Hash(inData, (word32)inDataLen, hash);
5.int keySize = wc_RsaEncryptSize(&rsaKey);
6.ret = wc_RsaSSL_Sign(
            hash,
            sizeof(hash),
            outSign,
            (word32)*inOutSignBufSize,
            &rsaKey,
            &rng
    );

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user_settings.h 2.49 kb, 1 downloads since 2026-02-16 

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  • Registered: 2021-07-06
  • Posts: 192

Re: RSA 2048 bit signature generation & verification

Hello,

Please share your wolfSSL version and if possible, your full wolfSSL code.  If you can't share your code, please try using our example here: https://github.com/wolfSSL/wolfssl-exam … fer/sign.c

Please also ensure that your code is including "#include <wolfssl/wolfcrypt/settings.h>" before all other wolfSSL headers.

Are you able to share any information on your project?  Are you working on a commercial or personal project?  If this information is sensitive you can contact us at support [AT] wolfssl [DOT] com.

Thanks,
Kareem

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