Merge #474: Disable re-randomization under more conditions

d206891 bump version to 0.23.4 (Andrew Poelstra)
b01337c context: unconditionally disable auto-rerandomization on wasm (Andrew Poelstra)
7482846 apply `global-context-not-secure` logic to Secp256k1::new (Andrew Poelstra)

Pull request description:

  Fixes #470

ACKs for top commit:
  Kixunil:
    ACK d206891
  tcharding:
    ACK d206891
  sanket1729:
    ACK d206891

Tree-SHA512: 2a7db5b75f55a007aa780b6317804c819c0366e207623220f72a06c2af09087accf1bc834f05899897afcc2035f5e9a5480d8a7ffff83536327c695602ba138d

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 0.23.4 - 2022-07-14
+
+* [Disable automatic rerandomization of contexts under WASM](https://github.com/rust-bitcoin/rust-secp256k1/pull/474)
+
 # 0.23.3 - 2022-06-29
 
 * [Add must_use for mut self key manipulation methods](https://github.com/rust-bitcoin/rust-secp256k1/pull/465)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "secp256k1"
-version = "0.23.3"
+version = "0.23.4"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
             "Andrew Poelstra <apoelstra@wpsoftware.net>" ]
 license = "CC0-1.0"

src/context.rs

@@ -47,7 +47,7 @@ pub mod global {
             static mut CONTEXT: Option<Secp256k1<All>> = None;
             ONCE.call_once(|| unsafe {
                 let mut ctx = Secp256k1::new();
-                #[cfg(all(feature = "rand-std", not(feature = "global-context-less-secure")))]
+                #[cfg(all(not(target_arch = "wasm32"), feature = "rand-std", not(feature = "global-context-less-secure")))]
                 {
                     ctx.randomize(&mut rand::thread_rng());
                 }
@@ -202,7 +202,7 @@ mod alloc_only {
                 size,
             };
 
-            #[cfg(feature = "rand-std")]
+            #[cfg(all(not(target_arch = "wasm32"), feature = "rand-std", not(feature = "global-context-less-secure")))]
             {
                 ctx.randomize(&mut rand::thread_rng());
             }