refactor: deno_crypto op crate (#7956)

This commit factors out "deno_crypto" op crate.

"rand" crate dependency was consequently moved to 
"deno_crypto" crate and reexported.

1 files changed, 43 insertions, 0 deletions

diff --git a/op_crates/crypto/lib.rs b/op_crates/crypto/lib.rs
new file mode 100644
index 000000000..a211a29b3
--- /dev/null
+++ b/op_crates/crypto/lib.rs
@@ -0,0 +1,43 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+#![deny(warnings)]
+
+use deno_core::error::AnyError;
+use deno_core::serde_json::json;
+use deno_core::serde_json::Value;
+use deno_core::JsRuntime;
+use deno_core::OpState;
+use deno_core::ZeroCopyBuf;
+use rand::rngs::StdRng;
+use rand::thread_rng;
+use rand::Rng;
+
+pub use rand; // Re-export rand
+
+/// Execute this crates' JS source files.
+pub fn init(isolate: &mut JsRuntime) {
+  let files = vec![(
+    "deno:op_crates/crypto/01_crypto.js",
+    include_str!("01_crypto.js"),
+  )];
+  for (url, source_code) in files {
+    isolate.execute(url, source_code).unwrap();
+  }
+}
+
+pub fn op_get_random_values(
+  state: &mut OpState,
+  _args: Value,
+  zero_copy: &mut [ZeroCopyBuf],
+) -> Result<Value, AnyError> {
+  assert_eq!(zero_copy.len(), 1);
+  let maybe_seeded_rng = state.try_borrow_mut::<StdRng>();
+  if let Some(seeded_rng) = maybe_seeded_rng {
+    seeded_rng.fill(&mut *zero_copy[0]);
+  } else {
+    let mut rng = thread_rng();
+    rng.fill(&mut *zero_copy[0]);
+  }
+
+  Ok(json!({}))
+}