Function bearssl::br_ghash_pclmul_get

pub unsafe extern "C" fn br_ghash_pclmul_get() -> br_ghash

\brief Obtain the pclmul GHASH implementation, if available.

If the pclmul implementation was compiled in the library (depending on the compiler abilities) and the local CPU appears to support the opcode, then this function will return a pointer to the br_ghash_pclmul() function. Otherwise, it will return 0.

\return the pclmul GHASH implementation, or 0.