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Cargo.toml

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+[package]
+name = "really-big-primes"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+miller_rabin = "1.1.1"
+num-bigint = "0.4.4"
+rand = "0.8.5"
+rayon = "1.8.0"

src/main.rs

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+use num_bigint::BigUint;
+use rand::{rngs::OsRng, RngCore};
+use rayon::iter::repeat;
+use rayon::prelude::*;
+
+const k: usize = 24;
+
+fn main() {
+    println!("Hello, world!");
+}
+
+fn get_prime(n: usize) -> BigUint {
+    repeat(())
+        .map(|_| {
+            let int = get_random_n_bit_integer(n);
+            if miller_rabin::is_prime(&int, k) {
+                Some(int)
+            } else {
+                None
+            }
+        })
+        .find_any(|p| p.is_some())
+        .unwrap()
+        .unwrap()
+}
+
+fn get_random_n_bit_integer(n: usize) -> BigUint {
+    let mut key = vec![0u8; n];
+    OsRng.fill_bytes(&mut key[..]);
+    let mut random_integer = BigUint::from_bytes_be(&key);
+    random_integer.set_bit(n as u64 - 1, true);
+    random_integer
+}