sha1_block_data_order
sha1_block_data_order(c, p, 1);
sha1_block_data_order(c, data, n);
sha1_block_data_order(c, data, 1);
sha1_block_data_order(c, p, 1);
sha1_block_data_order(c, p, 1);
void sha1_block_data_order(SHA_CTX *ctx, const void *p, size_t num);