spake2: bump curve25519-dalek to v3.0; rand_core => v0.5

This is a continuation of #33.

It bumps `curve25519-dalek` to the latest stable release and replaces
the `rand` crate with the version of `rand_core` which is compatible
with `curve25519-dalek`: v0.5 (which is still a version behind)

spake2/Cargo.toml

@@ -5,24 +5,18 @@ authors = ["Brian Warner <[email protected]>"]
 description = "The SPAKE2 password-authenticated key-exchange algorithm."
 documentation = "https://docs.rs/spake2"
 homepage = "https://github.com/RustCrypto/PAKEs"
-repository = "https://github.com/RustCrypto/PAKEs"
+repository = "https://github.com/RustCrypto/PAKEs/tree/master/spake2"
 license = "MIT OR Apache-2.0"
 keywords = ["crypto", "pake", "authentication"]
 categories = ["cryptography", "authentication"]
 exclude = [".gitignore"]
 readme = "README.md"
-edition = "2018"
+edition = "2021"
 rust-version = "1.56"
 
-[package.metadata.release]
-tag-prefix = "spake2-v"
-tag-message = "(cargo-release) spake2-v{{version}}"
-pre-release-commit-message = "(cargo-release) spake2-v{{version}}"
-pro-release-commit-message = "(cargo-release) start next development iteration spake2-v{{version}}"
-
 [dependencies]
-curve25519-dalek = "1.2"
-rand = "0.6"
+curve25519-dalek = "3"
+rand_core = { version = "0.5", default-features = false, features = ["getrandom"] }
 sha2 = "0.9"
 hkdf = "0.11"
 hex = "0.4"

spake2/src/lib.rs

@@ -222,7 +222,7 @@ use curve25519_dalek::edwards::CompressedEdwardsY;
 use curve25519_dalek::edwards::EdwardsPoint as c2_Element;
 use curve25519_dalek::scalar::Scalar as c2_Scalar;
 use hkdf::Hkdf;
-use rand::{rngs::OsRng, CryptoRng, Rng};
+use rand_core::{CryptoRng, OsRng, RngCore};
 use sha2::{Digest, Sha256};
 use std::fmt;
 use std::ops::Deref;
@@ -286,7 +286,7 @@ pub trait Group {
     fn hash_to_scalar(s: &[u8]) -> Self::Scalar;
     fn random_scalar<T>(cspring: &mut T) -> Self::Scalar
     where
-        T: Rng + CryptoRng;
+        T: RngCore + CryptoRng;
     fn scalar_neg(s: &Self::Scalar) -> Self::Scalar;
     fn element_to_bytes(e: &Self::Element) -> Vec<u8>;
     fn bytes_to_element(b: &[u8]) -> Option<Self::Element>;
@@ -352,7 +352,7 @@ impl Group for Ed25519Group {
     }
     fn random_scalar<T>(cspring: &mut T) -> c2_Scalar
     where
-        T: Rng + CryptoRng,
+        T: RngCore + CryptoRng,
     {
         c2_Scalar::random(cspring)
     }
@@ -632,19 +632,19 @@ impl<G: Group> SPAKE2<G> {
     }
 
     pub fn start_a(password: &Password, id_a: &Identity, id_b: &Identity) -> (SPAKE2<G>, Vec<u8>) {
-        let mut cspring: OsRng = OsRng::new().unwrap();
+        let mut cspring = OsRng;
         let xy_scalar: G::Scalar = G::random_scalar(&mut cspring);
         Self::start_a_internal(password, id_a, id_b, xy_scalar)
     }
 
     pub fn start_b(password: &Password, id_a: &Identity, id_b: &Identity) -> (SPAKE2<G>, Vec<u8>) {
-        let mut cspring: OsRng = OsRng::new().unwrap();
+        let mut cspring = OsRng;
         let xy_scalar: G::Scalar = G::random_scalar(&mut cspring);
         Self::start_b_internal(password, id_a, id_b, xy_scalar)
     }
 
     pub fn start_symmetric(password: &Password, id_s: &Identity) -> (SPAKE2<G>, Vec<u8>) {
-        let mut cspring: OsRng = OsRng::new().unwrap();
+        let mut cspring = OsRng;
         let xy_scalar: G::Scalar = G::random_scalar(&mut cspring);
         Self::start_symmetric_internal(password, id_s, xy_scalar)
     }