sha3_512_final
ATTRIBUTE_WARN_UNUSED_RET int sha3_512_final(sha3_512_context *ctx, u8 output[SHA3_512_DIGEST_SIZE]);
return sha3_512_final((sha3_512_context*)hctx, output);
ret = sha3_512_final(&ctx, output);
ret = sha3_512_final(&ctx, output);