Update rand to 0.9.x

Author: dmitrmax

Cargo.toml

@@ -19,7 +19,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
 default = ["std"]
-std = ["alloc", "secp256k1-sys/std", "rand?/std", "rand?/std_rng", "hashes?/std"]
+std = ["alloc", "secp256k1-sys/std", "rand?/std", "rand?/std_rng", "rand?/thread_rng", "hashes?/std"]
 # allow use of Secp256k1::new and related API that requires an allocator
 alloc = ["secp256k1-sys/alloc"]
 recovery = ["secp256k1-sys/recovery"]
@@ -37,7 +37,7 @@ global-context-less-secure = ["global-context"]
 secp256k1-sys = { version = "0.11.0", default-features = false, path = "./secp256k1-sys" }
 
 hashes = { package = "bitcoin_hashes", version = "0.14", default-features = false, optional = true }
-rand = { version = "0.8", default-features = false, optional = true }
+rand = { version = "0.9", default-features = false, optional = true }
 serde = { version = "1.0.103", default-features = false, optional = true }
 
 [dev-dependencies]

src/lib.rs

@@ -134,7 +134,7 @@
 //! * `lowmemory` - optimize the library for low-memory environments.
 //! * `global-context` - enable use of global secp256k1 context (implies `std`).
 //! * `serde` - implements serialization and deserialization for types in this crate using `serde`.
-//!           **Important**: `serde` encoding is **not** the same as consensus encoding!
+//!   **Important**: `serde` encoding is **not** the same as consensus encoding!
 //!
 
 // Coding conventions
@@ -504,8 +504,7 @@ fn to_hex<'a>(src: &[u8], target: &'a mut [u8]) -> Result<&'a str, ()> {
 
 #[cfg(feature = "rand")]
 pub(crate) fn random_32_bytes<R: rand::Rng + ?Sized>(rng: &mut R) -> [u8; 32] {
-    let mut ret = [0u8; 32];
-    rng.fill(&mut ret);
+    let ret: [u8;32] = rng.random();
     ret
 }
 

src/scalar.rs

@@ -42,7 +42,7 @@ impl Scalar {
 
     /// Generates a random scalar
     #[cfg(all(feature = "rand", feature = "std"))]
-    pub fn random() -> Self { Self::random_custom(rand::thread_rng()) }
+    pub fn random() -> Self { Self::random_custom(rand::rng()) }
 
     /// Generates a random scalar using supplied RNG
     #[cfg(feature = "rand")]

src/schnorr.rs

@@ -141,7 +141,7 @@ impl<C: Signing> Secp256k1<C> {
     /// generator to generate the auxiliary random data.
     #[cfg(all(feature = "rand", feature = "std"))]
     pub fn sign_schnorr(&self, msg: &[u8], keypair: &Keypair) -> Signature {
-        self.sign_schnorr_with_rng(msg, keypair, &mut rand::thread_rng())
+        self.sign_schnorr_with_rng(msg, keypair, &mut rand::rng())
     }
 
     /// Creates a schnorr signature without using any auxiliary random data.