ossl_rand_pool_add_begin
unsigned char *ossl_rand_pool_add_begin(RAND_POOL *pool, size_t len);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);