fix(ext/node): prime generation (#18861)

Towards https://github.com/denoland/deno/issues/18455

`safe`, `add` and `rem` options are not implemented because there is no
rust crate that provides this functionality (except rust-openssl maybe)
and its just not clear if this API is used widely.

2 files changed, 18 insertions, 1 deletions

diff --git a/ext/node/ops/crypto/mod.rs b/ext/node/ops/crypto/mod.rs
index d224b40f7..92e3029e0 100644
--- a/ext/node/ops/crypto/mod.rs
+++ b/ext/node/ops/crypto/mod.rs
@@ -901,3 +901,20 @@ pub async fn op_node_scrypt_async(
   })
   .await?
 }
+
+#[inline]
+fn gen_prime(size: usize) -> ZeroCopyBuf {
+  primes::Prime::generate(size).0.to_bytes_be().into()
+}
+
+#[op]
+pub fn op_node_gen_prime(size: usize) -> ZeroCopyBuf {
+  gen_prime(size)
+}
+
+#[op]
+pub async fn op_node_gen_prime_async(
+  size: usize,
+) -> Result<ZeroCopyBuf, AnyError> {
+  Ok(tokio::task::spawn_blocking(move || gen_prime(size)).await?)
+}
diff --git a/ext/node/ops/crypto/primes.rs b/ext/node/ops/crypto/primes.rs
index d03398f02..15aa643ad 100644
--- a/ext/node/ops/crypto/primes.rs
+++ b/ext/node/ops/crypto/primes.rs
@@ -8,7 +8,7 @@ use num_traits::Zero;
 use rand::Rng;
 use std::ops::Deref;
 
-pub struct Prime(num_bigint_dig::BigUint);
+pub struct Prime(pub num_bigint_dig::BigUint);
 
 impl Prime {
   pub fn generate(n: usize) -> Self {