sha256_block_data_order
sha256_block_data_order(c, p, 1);
sha256_block_data_order(c, data, n);
sha256_block_data_order(c, data, 1);
sha256_block_data_order(c, p, 1);
sha256_block_data_order(c, p, 1);
void sha256_block_data_order(SHA256_CTX *ctx, const void *_in, size_t num);