generic-ec 0.5.1

General elliptic curve cryptography
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//! Internals for Secret structs, like `SecretScalar` and `SecretEncodedPoint`.
//! They have a different representation based on the presence of `alloc`:
//! either a reference-counted pinned one, or an unpinned value

#[cfg(feature = "alloc")]
mod imp {
    use alloc::sync::Arc;

    pub type Secret<T> = Arc<zeroize::Zeroizing<T>>;

    #[inline(always)]
    pub fn new<T>(x: &mut T) -> Secret<T>
    where
        T: zeroize::Zeroize + Default + Clone,
    {
        let mut value_on_heap = Arc::<zeroize::Zeroizing<T>>::default();
        let value_mut = Arc::make_mut(&mut value_on_heap);
        core::mem::swap(&mut **value_mut, x);
        x.zeroize();
        value_on_heap
    }

    pub fn inner_ref<T>(x: &Secret<T>) -> &T
    where
        T: zeroize::Zeroize,
    {
        x.as_ref()
    }
}
#[cfg(not(feature = "alloc"))]
mod imp {
    pub type Secret<T> = zeroize::Zeroizing<T>;

    #[inline(always)]
    pub fn new<T>(x: &mut T) -> Secret<T>
    where
        T: zeroize::Zeroize + Clone,
    {
        let value_new = zeroize::Zeroizing::new(x.clone());
        x.zeroize();
        value_new
    }

    pub fn inner_ref<T>(x: &Secret<T>) -> &T
    where
        T: zeroize::Zeroize,
    {
        core::ops::Deref::deref(x)
    }
}

/// Unwrap the Secret into the underlying type
pub(crate) use imp::inner_ref;
/// Wrap the underlying type into the Secret repr
pub(crate) use imp::new;
/// Type used as the representation
pub(crate) use imp::Secret;