diff --git a/rsa/Makefile b/rsa/Makefile
index 80cf2bf..6cc1a78 100644
--- a/rsa/Makefile
+++ b/rsa/Makefile
@@ -15,6 +15,15 @@ $(NAME):
 fast:
 	gcc -Wall -Wextra -Werror -Wunused-function -O3 $(SRC) -o $(NAME)
 
+fast-info:
+	gcc -Wall -Wextra -Werror -Wunused-function -O3 -fopt-info $(SRC) -o $(NAME)
+
+really-fast:
+	gcc -Wall -Wextra -Werror -Wunused-function -O3 -march=native $(SRC) -o $(NAME)
+
+really-fast-info:
+	gcc -Wall -Wextra -Werror -Wunused-function -O3 -march=native -fopt-info $(SRC) -o $(NAME)
+
 profile:
 	gcc -Wall -Wextra -Werror -Wunused-function -pg $(SRC) -o $(NAME)
 
diff --git a/rsa/bigint.c b/rsa/bigint.c
index e44a3ac..415a604 100644
--- a/rsa/bigint.c
+++ b/rsa/bigint.c
@@ -32,7 +32,6 @@ void bigint_bitwise_left_shift(bigint_t n) {
 }
 
 void move_bigint_bitwise_left_shift(bigint_t n, bigint_t result) {
-//	my_memcpy(result.data, n.data, n.len * sizeof(uint32_t));
 	for (int i = result.len - 1; i > 0; i--) {
 		result.data[i] = n.data[i] << 1 | ((n.data[i - 1] & (1 << 31)) >> 31);
 	}
@@ -90,7 +89,6 @@ int is_zero(bigint_t n) {
 
 // TODO check opti
 void bigint_substraction(bigint_t a, bigint_t b, bigint_t borrow, bigint_t y) {
-	//my_memcpy(borrow.data, b.data, b.len * sizeof(uint32_t));
 	my_memcpy(y.data, b.data, b.len * sizeof(uint32_t));
 	while (!is_zero(y)) {
 		for (size_t i = 0; i < a.len; i++) {
@@ -242,18 +240,39 @@ void bulk_destroy(bigint_t x, bigint_t y, bigint_t n, bigint_t d, bigint_t two,
 }
 
 int prime_division(bigint_t *primes, bigint_t n, bigint_t mod, bigint_t custom2, bigint_t borrow_sub, bigint_t y_sub) {
-	//printf("testing %u\n", n.data[0]);
 	bigint_set_zeros(mod);
-	for (int i = 0; i < 3245; i++) {
+	for (int i = 0; i < 200; i++) {
 		mod.data[0] = primes[i].data[0];
 		custom_bigint_modulo(n, primes[i], custom2, mod, borrow_sub, y_sub);
-		//printf("i %d prime %d mod %d\n", i, primes[i].data[0], custom2.data[0]);
 		if (is_zero(custom2)) {
 			return 1;
 		}
 	}
 	return 0;
 }
+
+int miller_rabin(size_t len, bigint_t a, bigint_t two, bigint_t n_minus_two, bigint_t d, bigint_t n, bigint_t x, bigint_t custom, bigint_t custom2, bigint_t mod, bigint_t borrow_sub, bigint_t y_sub, bigint_t *b_tool, bigint_t n_minus_one, uint32_t s, bigint_t y, bigint_t one) {
+	for (uint32_t k = 0; k < 20; k++) {
+		bigint_set_zeros(a);
+		while (bigint_cmp(a, two) < 0 || bigint_cmp(a, n_minus_two) > 0) {
+			bigint_set_random_bytes(a, len);
+		}
+		custom_bigint_pow_mod(a, d, n, x, custom, custom2, mod, borrow_sub, y_sub, b_tool);
+		for (uint32_t i = 0; i < s; i++) {
+			custom_bigint_pow_mod(x, two, n, y, custom, custom2, mod, borrow_sub, y_sub, b_tool);
+			if (!bigint_dif(y, one) && bigint_dif(x, one) && bigint_dif(x, n_minus_one)) {
+				return 0;
+			}
+			bigint_destroy(x);
+			x = bigint_clone(y);
+		}
+		if (bigint_dif(y, one)) {
+			return 0;
+		}
+	}
+	return 1;
+}
+
 bigint_t bigint_prime(size_t len, bigint_t *primes) {
 	size_t my_size = len * 2;
 
@@ -276,7 +295,6 @@ bigint_t bigint_prime(size_t len, bigint_t *primes) {
 	bigint_t y = bigint_zero(my_size);
 	bigint_t custom = bigint_zero(my_size);
 	bigint_t custom2 = bigint_zero(my_size);
-	bigint_t *b_tool = (bigint_t *)protected_malloc(32 * sizeof(bigint_t));
 
 
 	if (prime_division(primes, n, mod, custom2, borrow_sub, y_sub)) {
@@ -286,11 +304,11 @@ bigint_t bigint_prime(size_t len, bigint_t *primes) {
 	}
 	memcpy(mod.data, n.data, n.len * sizeof(uint32_t));
 
+	bigint_t *b_tool = (bigint_t *)protected_malloc(32 * sizeof(bigint_t));
 	for (int i = 0; i < 32; i++) {
 		b_tool[i] = bigint_zero(my_size * 2);
 	}
 
-
 	bigint_t two = bigint_zero(my_size);
 	bigint_t one = bigint_zero(my_size);
 	two.data[0] = 2;
@@ -301,46 +319,9 @@ bigint_t bigint_prime(size_t len, bigint_t *primes) {
 	n_minus_one.data[0] -= 1;
 	bigint_decrement(n_minus_two);
 	bigint_t a = bigint_zero(my_size);
-	for (uint32_t k = 0; k < 128; k++) {
-		bigint_set_zeros(a);
-		while (bigint_cmp(a, two) < 0 || bigint_cmp(a, n_minus_two) > 0) {
-			bigint_set_random_bytes(a, len);
-		}
-		custom_bigint_pow_mod(a, d, n, x, custom, custom2, mod, borrow_sub, y_sub, b_tool);
-		for (uint32_t i = 0; i < s; i++) {
-			custom_bigint_pow_mod(x, two, n, y, custom, custom2, mod, borrow_sub, y_sub, b_tool);
-			if (!bigint_dif(y, one) && bigint_dif(x, one) && bigint_dif(x, n_minus_one)) {
-				bulk_destroy(x, y, n, d, two, one, n_minus_two, n_minus_one);
-				bigint_destroy(custom);
-				bigint_destroy(custom2);
-				bigint_destroy(a);
-				bigint_destroy(mod);
-				bigint_destroy(borrow_sub);
-				bigint_destroy(y_sub);
-				for (int i = 0; i < 32; i++) {
-					bigint_destroy(b_tool[i]);
-				}
-				free(b_tool);
-				return bigint_prime(len, primes);
-			}
-			bigint_destroy(x);
-			x = bigint_clone(y);
-		}
-		if (bigint_dif(y, one)) {
-			bulk_destroy(x, y, n, d, two, one, n_minus_two, n_minus_one);
-			bigint_destroy(custom);
-			bigint_destroy(custom2);
-			bigint_destroy(a);
-			bigint_destroy(mod);
-			bigint_destroy(borrow_sub);
-			bigint_destroy(y_sub);
-			for (int i = 0; i < 32; i++) {
-				bigint_destroy(b_tool[i]);
-			}
-			free(b_tool);
-			return bigint_prime(len, primes);
-		}
-	}
+
+	int is_prime =  miller_rabin(len, a, two, n_minus_two, d, n, x, custom, custom2, mod, borrow_sub, y_sub, b_tool, n_minus_one, s, y, one);
+
 	bulk_destroy(x, y, custom, d, two, one, n_minus_two, n_minus_one);
 	bigint_destroy(custom2);
 	bigint_destroy(a);
@@ -351,6 +332,11 @@ bigint_t bigint_prime(size_t len, bigint_t *primes) {
 		bigint_destroy(b_tool[i]);
 	}
 	free(b_tool);
-	return n;
+
+	if (is_prime) {
+		return n;
+	}
+	bigint_destroy(n);
+	return bigint_prime(len, primes);
 }
 
diff --git a/rsa/rsa.c b/rsa/rsa.c
index e83421e..22dccbf 100644
--- a/rsa/rsa.c
+++ b/rsa/rsa.c
@@ -33,17 +33,13 @@ rsa_t rsa_generate_keys(size_t block_size) {
 		tok = strtok(NULL, "\n");
 		i += 1;
 	}
+	primes[0].data[0] = 65537;
 	printf("ret %d\n", ret);
 
-
 	rsa_t rsa = rsa_init(len, primes);
 	bigint_destroy(rsa.p);
 	bigint_destroy(rsa.q);
-	for (int i = 0; i < 18; i++) {
-		bigint_t p = bigint_prime(len / 2, primes);
-		printf("%lu\n", ((uint64_t)p.data[1] << 32) + (uint64_t)p.data[0]);
-		bigint_destroy(p);
-	}
+
 	return rsa;
 }
 
diff --git a/rsa/rsa.h b/rsa/rsa.h
index 4a0661e..5537b35 100644
--- a/rsa/rsa.h
+++ b/rsa/rsa.h
@@ -9,7 +9,7 @@
 #include <unistd.h>
 #include <string.h>
 
-#define RSA_BLOCK_SIZE 256 
+#define RSA_BLOCK_SIZE 128 
 
 typedef struct bigint_s {
 	uint32_t *data;