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sissiok · 2015-07-21 10:13:28

Hi, I am trying to extra the rsa public key from a certificate. I found the following method in test.c:

DecodedCert cert;

InitDecodedCert(....);

ParseCert(....);

RsaPublicKeyDecode(....);

This method requires to define WOLFSSL_TEST_CERT. How to define and enable it?

Thanks a lot!

chrisc · 2015-07-21 10:44:42

Hi sissiok,

Those functions are prototyped in the <wolfssl/wolfcrypt/asn.h> header file.

To define WOLFSSL_TEST_CERT, you need to add it to C_EXTRA_FLAGS if using ./configure:

cd wolfssl-3.6.0
./configure C_EXTRA_FLAGS="-DWOLFSSL_TEST_CERT"
make
sudo make install

Then, define it when compiling your application as well.

Best Regards,
Chris

sissiok · 2015-07-21 11:32:24

Can you please tell me how to define it in makefile?

My makefile looks like:

CC=g++
CFLAGS = -g -I -Wall -DHAVE_AESGCM -DWOLFSSL_KEY_GEN -DWOLFSSL_TEST_CERT

But "-DWOLFSSL_TEST_CERT" does not work as I got error: undefined reference to 'InitDecode'

Thanks!

chrisc · 2015-07-22 14:10:40

Hi sissiok,

Are you also:

1) Including <wolfssl/wolfcrypt/asn.h> in your application?

2) Naming the function correctly? Your error reads 'InitDecode', but the function name is 'InitDecodedCert()'

3) Are you also compiling wolfSSL with the WOLFSSL_TEST_CERT define added to C_EXTRA_FLAGS during ./configure?

Thanks,
Chris

how to extra a rsa public key from a certificate