This article describes how to compile and use OpenSSL in VC 6.0.

I. Compile OpenSSL

Install Perl correctly before compiling OpenSSL, because you need to use this program when compiling OpenSSL.

Download the latest Perl: Latest. Then install it.

Download the latest version of OpenSSL: http://www.openssl.org/source/openssl-0.9.8g.tar.gz

Then release the source code in the C: \ openssl-0.9.8g directory.

Go to the OpenSSL source code directory.
C: \ openssl-0.9.8.g

The following describes the execution process of Install. w32 in the directory:

Run configure:
Perl configure VC-WIN32 -- prefix = C:/OpenSSL

Create a makefile:
Ms \ do_ms

Compile the dynamic library:
Nmake-F Ms \ NTDLL. Mak
Compile the static Library:
Nmake-F Ms \ nt. Mak

Test dynamic library:
Nmake-F Ms \ NTDLL. Mak Test
Test static Library:
Nmake-F Ms \ nt. Mak Test

Install dynamic library:
Nmake-F Ms \ NTDLL. Mak install
Install static Library:
Nmake-F Ms \ nt. Mak install

Clear the compilation of the last dynamic library for recompilation:
Nmake-F Ms \ NTDLL. Mak clean
Clear the previous static library compilation for recompilation:
Nmake-F Ms \ nt. Mak clean

Ii. Use OpenSSL

Use the above function library in VC Configuration:
Choose tools> options. In the displayed dialog box, select the directories tab.
Add the directory "C: \ OpenSSL \ include" in the "show directories for:" "include files" option; "library files" select to add the directory "C: \ OpenSSL \ Lib ".
Then add "libeay32.lib" to compile the project that needs to be linked to the OpenSSL function library.

Iii. Problems

I encountered the following problems when connecting to the static function library of OpenSSL:
Linking...
Msvcrt. Lib (msvcrt. dll): Error lnk2005: _ strchr already defined in libcmtd. Lib (strchr. OBJ)
...

This is because the OpenSSL static function library uses the release version of the multi-threaded DLL of VC, and my program uses the release version of the multi-threaded static link.

You can adjust the library function version used by the static function library of OpenSSL. The adjustment process is as follows:

Edit the file Ms \ nt. Mak and set the file to 19th rows.
"Cflag =/MD/Ox/O2/ob2/W3/wx/gs0/GF/Gy/nologo-dopenssl_sysname_win32-Example-dl_endian-ddso_win32-Example-example/fdout32-Example-example- dopenssl_no_seed-dopenssl_no_rc5-dopenssl_no_mdc2-dopenssl_no_tlsext-dopenssl_no_krb5-dopenssl_no_dynamic_engine"
"/MD" in to "/MT ". Then re-compile and install OpenSSL.

Iv. Appendix: Instructions for Compiling different versions of the C/C ++ Runtime Library in VC
In the vc c/C ++ Runtime Library of different versions of the compilation instructions (http://blog.yesky.com/271/dgkang/1737771.shtml) in a detailed description of the connection to different versions of the library compilation instructions are as follows:
C Runtime Library:
/MD msvcrt. Lib multi-threaded DLL release version
/MDD msvcrtd. Lib multi-threaded DLL debug version
/MT libcmt. Lib multi-threaded static link release version
/MTD libcmtd. Lib multi-threaded static link debug version
/CLR msvcmrt. Lib: a mixture of managed code and unmanaged code
/CLR: Pure msvcurt. Lib pure managed code
C ++ Standard Library:
/MD msvcprt. Lib multi-threaded DLL release version
/MDD msvcprtd. Lib multi-thread DLL debug version
/MT libcpmt. Lib multi-threaded static link release version
/MTD libcpmtd. Lib multi-threaded static link debug version