fix race in global crypto provider installation using OnceLock::set

crates/precompile/src/interface.rs

@@ -11,12 +11,7 @@ static CRYPTO: OnceLock<Box<dyn Crypto>> = OnceLock::new();
 
 /// Install a custom crypto provider globally.
 pub fn install_crypto<C: Crypto + 'static>(crypto: C) -> bool {
-    if CRYPTO.get().is_some() {
-        return false;
-    }
-
-    CRYPTO.get_or_init(|| Box::new(crypto));
-    true
+    CRYPTO.set(Box::new(crypto)).is_ok()
 }
 
 /// Get the installed crypto provider, or the default if none is installed.

crates/primitives/src/once_lock.rs

@@ -41,6 +41,15 @@ mod no_std_impl {
         pub fn get(&self) -> Option<&T> {
             self.inner.get()
         }
+
+        /// Sets the value of the OnceLock, returning Err with the value if it was already set.
+        #[inline]
+        pub fn set(&self, value: T) -> Result<(), T>
+        where
+            T: Into<Box<T>>,
+        {
+            self.inner.set(value.into())
+        }
     }
 }
 
@@ -51,3 +60,17 @@ pub use std::sync::OnceLock;
 
 #[cfg(not(feature = "std"))]
 pub use no_std_impl::OnceLock;
+
+#[cfg(feature = "std")]
+pub trait OnceLockExt<T> {
+    /// Sets the value of the OnceLock, returning Err with the value if it was already set.
+    fn set(&self, value: T) -> Result<(), T>;
+}
+
+#[cfg(feature = "std")]
+impl<T> OnceLockExt<T> for OnceLock<T> {
+    #[inline]
+    fn set(&self, value: T) -> Result<(), T> {
+        std::sync::OnceLock::set(self, value)
+    }
+}