Function bearssl::br_ghash_pwr8_get

pub unsafe extern "C" fn br_ghash_pwr8_get() -> br_ghash

\brief Obtain the pwr8 GHASH implementation, if available.

If the pwr8 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_pwr8() function. Otherwise, it will return 0.

\return the pwr8 GHASH implementation, or 0.