1 Topic by nesnub

(1 replies, posted in wolfSSL)

Hello, I'm trying to compile the latest stable version of ctaocrypt in VisualStudio 2013. I've tried using the provided project file, and I've tried creating my own cleaner project for it but I hit the same issue.

All I want is to get the most basic Rsa and AES calls in ctaocrypt, no ssl, no tls, no certs or anything like that, just:

RsaPublicKeyDecode
RsaSSL_Verify
AesSetKey
AesCbcEncrypt
AesCbcDecrypt
RsaPublicEncrypt
InitRng
RsaPrivateKeyDecode
RsaPrivateDecrypt
RNG_GenerateBlock

The issue I am finding is that:
a) the project provided as-is does not compile (pretty sure even on older VS versions) since it fails to include memory.c which is required for user-specified alloc functions etc.
b) I can never seem to compile (and link) succesfully without the two following errors:

2>ctaocrypt.lib(asn.obj) : error LNK2019: unresolved external symbol _GetCA referenced in function _ParseCertRelative
2>ctaocrypt.lib(asn.obj) : error LNK2019: unresolved external symbol _GetCAByName referenced in function _ParseCertRelative

I've tried compiling with NO_CERTS, but this causes other dependencies between Rsa/Sha256/Asn. I can't find the right combination of flags to remove these. I can get the GetCAByName to go away by using NO_SKID, but not the GetCA one.

This used to work several versions ago (maybe 1-2 years ago, not sure the exact version), but it looks like asn.c was refactored and broke this.

If it's not a supported "mode" (bare-bones ctaocrypt) anymore, are there any recommendations on a possible alternative. I really just wanted a portable, lightweight RSA+AES implementation in C.

Thanks

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2 Topic by nesnub

(1 replies, posted in wolfSSL)

Hello, my quest to find a simple C library that implements RSA and ssl for embedded systems has led me to wolfSSL. So far I like what I see (although under-documented).

My question is quite simple:

I want to generate a simple RSA key pair, a public and a private key that I will then be able to use with the wolfSSL API. How can I do this? I've seen one thread in this forum that seemed to indicate it's not possible, but I would like to be sure.

If it's not possible, may I inquire why, it seems like it is a core capability of RSA/

Finally, if it's not implemented in wolfSSL, does anyone have some pointers as to how I can implement it myself?

Thanks

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