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Re: How to use openssl in cygwin

cxf wrote:
> Hi,all:
>    I installed the Cygwin which is the Full version.
>    I write the Program as the following:
>    #include <openssl/evp.h>
>    int  main()
>    {
>     EVP_MD_CTX md_ctx;
>     unsigned int result_size;
>     int rv;
>     rv = EVP_SignInit(&md_ctx, EVP_sha1());
>     return rv;
>    }
>   It is very simple,then I compile the program using the Cygwin(the file 
> name is example.c)
>    gcc -c example.c
>    gcc -lcrypto -o example example.o
>    but the gcc give out the error:
>    undefined  reference to '_EVP_sha1'
>    undefined  reference to '_EVP_DigestInit'
>    I have checked that the libcrypto.a is in the right way.
>    I doubt whether the libcrypto.a have the function: EVP_sha1 and 
> EVP_DigestInit.

A rookie mistake.  Your library is in the wrong place.  Put
it at the end, not the beginning of the line.

>    (I compile the example.c in Linux,It is OK!)

That's a crutch that it's best not to make a habit of
leaning on...

Larry Hall                    
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746

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