[openssl-users] compilation error with openssl-1.1.0 and DH_get0_key

[Benjamin Kaduk]

On 02/21/2018 10:16 AM, Robert Watson wrote:
> I'm trying to update a crypto library for crtmpserver to work with
> openssl 1.1.0.  The software is no longer actively maintained and my
> c++ skills are somewhat rudimentary but I keep getting a compilation
> error for something that seems trivial.
>
> Here's the code snippet:
> bool DHWrapper::CopyPublicKey(uint8_t *pDst, int32_t dstLength) {
>     if (_pDH == NULL) {
>         FATAL("DHWrapper not initialized");
>         return false;
>     }
>     BIGNUM *_keyPublic,*_keyPrivate;
>     _keyPublic = BN_new();
>     _keyPrivate = BN_new();
>     DH_get0_key( _pDH, *_keyPublic, *_keyPrivate );

Use '&' instead of '*'

-Ben

>     CopyKey(_keyPublic, pDst, dstLength);
>     return true;
> }
>
> Here's the compilation error:
> /build/crtmpserver/src/crtmpserver/sources/common/src/utils/misc/crypto.cpp:
> In member function ‘bool DHWrapper::CopyPublicKey(uint8_t*, int32_t)’:
> /build/crtmpserver/src/crtmpserver/sources/common/src/utils/misc/crypto.cpp:92:47:
> error: cannot convert ‘BIGNUM {aka bignum_st}’ to ‘const BIGNUM** {aka
> const bignum_st**}’ for argument ‘2’ to ‘void DH_get0_key(const DH*,
> const BIGNUM**, const BIGNUM**)’
>   DH_get0_key( _pDH, *_keyPublic, *_keyPrivate );
>                                                ^
> make[2]: *** [common/CMakeFiles/common.dir/build.make:591:
> common/CMakeFiles/common.dir/build/crtmpserver/src/crtmpserver/sources/common/src/utils/misc/crypto.cpp.o]
> Error 1
> make[1]: *** [CMakeFiles/Makefile2:231:
> common/CMakeFiles/common.dir/all] Error 2
> make: *** [Makefile:130: all] Error 2
>
> What am I doing wrong? Thanks,
> Robert
>
>
>

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