On 10/08/2022 00:11, Imazu Setsuo wrote:
Hello, my name is Imazu.
I am using OpenSSL3.0.5 to develop a windows program.
When I call PEM_read_PrivateKey() I get the following error:
OPENSSL_Uplink(00007FF8011DD3E0,08): no OPENSSL_Applink
The source that calls PEM_read_PrivateKey() includes the following sources.
#include <openssl/applink.c>
In the test program
test.exe --> my_appl.dll --> openssl.dll
, the above include is the source in my_appl.dll.
The depends tool (Dependency Walker) can check the entry of
OPENSSL_Applink.
By the way, if you describe "#include <openssl/applink.c>" in the source
inside test.exe, it will work.
However, I want to complete the processing within my_appl.dll.
Please tell me a good way.
Best regards.
The problem comes when your code opens a FILE* and then passes it for
use to OpenSSL. If your code and OpenSSL are using a different C runtime
then that's going to fail.
A possible workaround is not call PEM_read_PrivateKey() at all and
instead use PEM_read_bio_PrivateKey(). You can then (for example) load
the file into memory completely within your code and store the data in a
mem BIO (e.g. using BIO_new_mem_buf()). This removes the need to pass
FILE * pointers from one dll to another and avoids the problem.
Matt
