Small modernization after MSRV bump

.travis.yml

@@ -62,7 +62,7 @@ script:
   - if [ ${TRAVIS_RUST_VERSION} == "stable" -a "$TRAVIS_OS_NAME" = "linux" ]; then
     clang --version &&
     CARGO_TARGET_DIR=wasm cargo install --verbose --force wasm-pack &&
-    sed -i 's/\[lib\]/[lib]\ncrate-type = ["cdylib", "rlib"]/' Cargo.toml &&
+    printf '\n[lib]\ncrate-type = ["cdylib", "rlib"]\n' >> Cargo.toml &&
     CC=clang-9 wasm-pack build &&
     CC=clang-9 wasm-pack test --node;
     fi

Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-
 name = "secp256k1"
 version = "0.19.0"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
@@ -17,10 +16,6 @@ autoexamples = false # Remove when edition 2018 https://github.com/rust-lang/car
 [package.metadata.docs.rs]
 features = [ "rand", "rand-std", "serde", "recovery", "endomorphism" ]
 
-[lib]
-name = "secp256k1"
-path = "src/lib.rs"
-
 [features]
 unstable = ["recovery", "rand-std"]
 default = ["std"]
@@ -40,6 +35,10 @@ fuzztarget = ["secp256k1-sys/fuzztarget"]
 
 [dependencies]
 secp256k1-sys = { version = "0.3.0", default-features = false, path = "./secp256k1-sys" }
+bitcoin_hashes = { version = "0.9", optional = true }
+rand = { version = "0.6", default-features = false, optional = true }
+serde = { version = "1.0", default-features = false, optional = true }
+
 
 [dev-dependencies]
 rand = "0.6"
@@ -51,19 +50,6 @@ bitcoin_hashes = "0.9"
 wasm-bindgen-test = "0.3"
 rand = { version = "0.6", features = ["wasm-bindgen"] }
 
-[dependencies.bitcoin_hashes]
-version = "0.9"
-optional = true
-
-[dependencies.rand]
-version = "0.6"
-optional = true
-default-features = false
-
-[dependencies.serde]
-version = "1.0"
-optional = true
-default-features = false
 
 [[example]]
 name = "sign_verify_recovery"

secp256k1-sys/Cargo.toml

@@ -21,10 +21,6 @@ features = [ "recovery", "endomorphism", "lowmemory" ]
 [build-dependencies]
 cc = "1.0.28"
 
-[lib]
-name = "secp256k1_sys"
-path = "src/lib.rs"
-
 [features]
 default = ["std"]
 recovery = []

secp256k1-sys/src/lib.rs

@@ -16,16 +16,13 @@
 //! Direct bindings to the underlying C library functions. These should
 //! not be needed for most users.
 
-#![crate_type = "lib"]
-#![crate_type = "rlib"]
-#![crate_type = "dylib"]
-#![crate_name = "secp256k1_sys"]
-
-#![cfg_attr(all(not(test), not(fuzztarget), not(feature = "std")), no_std)]
-#![cfg_attr(feature = "dev", allow(unstable_features))]
-#![cfg_attr(feature = "dev", feature(plugin))]
-#![cfg_attr(feature = "dev", plugin(clippy))]
+// Coding conventions
+#![deny(non_upper_case_globals)]
+#![deny(non_camel_case_types)]
+#![deny(non_snake_case)]
+#![deny(unused_mut)]
 
+#![cfg_attr(all(not(test), not(feature = "std")), no_std)]
 #[cfg(any(test, feature = "std"))]
 extern crate core;
 
@@ -97,9 +94,6 @@ impl_raw_debug!(PublicKey);
 impl PublicKey {
     /// Create a new (zeroed) public key usable for the FFI interface
     pub fn new() -> PublicKey { PublicKey([0; 64]) }
-    /// Create a new (uninitialized) public key usable for the FFI interface
-    #[deprecated(since = "0.15.3", note = "Please use the new function instead")]
-    pub unsafe fn blank() -> PublicKey { PublicKey::new() }
 }
 
 impl Default for PublicKey {
@@ -123,9 +117,6 @@ impl_raw_debug!(Signature);
 impl Signature {
     /// Create a new (zeroed) signature usable for the FFI interface
     pub fn new() -> Signature { Signature([0; 64]) }
-    /// Create a new (uninitialized) signature usable for the FFI interface
-    #[deprecated(since = "0.15.3", note = "Please use the new function instead")]
-    pub unsafe fn blank() -> Signature { Signature::new() }
 }
 
 impl Default for Signature {
@@ -467,7 +458,7 @@ mod fuzz_dummy {
     use self::std::{ptr, mem};
     use self::std::boxed::Box;
     use types::*;
-    use ::{Signature, Context, NonceFn, EcdhHashFn, PublicKey,
+    use {Signature, Context, NonceFn, EcdhHashFn, PublicKey,
         SECP256K1_START_NONE, SECP256K1_START_VERIFY, SECP256K1_START_SIGN,
         SECP256K1_SER_COMPRESSED, SECP256K1_SER_UNCOMPRESSED};
 

secp256k1-sys/src/macros.rs

@@ -130,7 +130,7 @@ macro_rules! impl_array_newtype {
                 &dat[..]
             }
         }
-        impl ::CPtr for $thing {
+        impl $crate::CPtr for $thing {
             type Target = $ty;
             fn as_c_ptr(&self) -> *const Self::Target {
                 if self.is_empty() {

secp256k1-sys/src/recovery.rs

@@ -28,9 +28,6 @@ impl_raw_debug!(RecoverableSignature);
 impl RecoverableSignature {
     /// Create a new (zeroed) signature usable for the FFI interface
     pub fn new() -> RecoverableSignature { RecoverableSignature([0; 65]) }
-    /// Create a new (uninitialized) signature usable for the FFI interface
-    #[deprecated(since = "0.15.3", note = "Please use the new function instead")]
-    pub unsafe fn blank() -> RecoverableSignature { RecoverableSignature::new() }
 }
 
 impl Default for RecoverableSignature {

src/context.rs

@@ -14,7 +14,7 @@ pub use self::std_only::*;
 pub mod global {
     use std::ops::Deref;
     use std::sync::Once;
-    use ::{Secp256k1, All};
+    use {Secp256k1, All};
 
     /// Proxy struct for global `SECP256K1` context
     pub struct GlobalContext {

src/lib.rs

@@ -37,18 +37,10 @@
 //! trigger any assertion failures in the upstream library.
 //!
 //! ```rust
-//! extern crate secp256k1;
-//! # #[cfg(feature="bitcoin_hashes")]
-//! extern crate bitcoin_hashes;
-//! # #[cfg(feature="rand")]
-//! extern crate rand;
-//!
-//! #
-//! # fn main() {
 //! # #[cfg(all(feature="rand", feature="bitcoin_hashes"))] {
-//! use rand::rngs::OsRng;
+//! use secp256k1::rand::rngs::OsRng;
 //! use secp256k1::{Secp256k1, Message};
-//! use bitcoin_hashes::sha256;
+//! use secp256k1::bitcoin_hashes::sha256;
 //!
 //! let secp = Secp256k1::new();
 //! let mut rng = OsRng::new().expect("OsRng");
@@ -57,15 +49,14 @@
 //!
 //! let sig = secp.sign(&message, &secret_key);
 //! assert!(secp.verify(&message, &sig, &public_key).is_ok());
-//! # } }
+//! # }
 //! ```
 //!
 //! The above code requires `rust-secp256k1` to be compiled with the `rand` and `bitcoin_hashes`
 //! feature enabled, to get access to [`generate_keypair`](struct.Secp256k1.html#method.generate_keypair)
 //! Alternately, keys and messages can be parsed from slices, like
 //!
 //! ```rust
-//! # fn main() {
 //! use self::secp256k1::{Secp256k1, Message, SecretKey, PublicKey};
 //!
 //! let secp = Secp256k1::new();
@@ -77,13 +68,11 @@
 //!
 //! let sig = secp.sign(&message, &secret_key);
 //! assert!(secp.verify(&message, &sig, &public_key).is_ok());
-//! # }
 //! ```
 //!
 //! Users who only want to verify signatures can use a cheaper context, like so:
 //!
 //! ```rust
-//! # fn main() {
 //! use secp256k1::{Secp256k1, Message, Signature, PublicKey};
 //!
 //! let secp = Secp256k1::verification_only();
@@ -115,44 +104,28 @@
 //! ]).expect("compact signatures are 64 bytes; DER signatures are 68-72 bytes");
 //!
 //! assert!(secp.verify(&message, &sig, &public_key).is_ok());
-//! # }
 //! ```
 //!
 //! Observe that the same code using, say [`signing_only`](struct.Secp256k1.html#method.signing_only)
 //! to generate a context would simply not compile.
 //!
 
-#![crate_type = "lib"]
-#![crate_type = "rlib"]
-#![crate_type = "dylib"]
-#![crate_name = "secp256k1"]
-
 // Coding conventions
 #![deny(non_upper_case_globals)]
 #![deny(non_camel_case_types)]
 #![deny(non_snake_case)]
 #![deny(unused_mut)]
 #![warn(missing_docs)]
 
-// In general, rust is absolutely horrid at supporting users doing things like,
-// for example, compiling Rust code for real environments. Disable useless lints
-// that don't do anything but annoy us and cant actually ever be resolved.
-#![allow(bare_trait_objects)]
-#![allow(ellipsis_inclusive_range_patterns)]
 
-#![cfg_attr(feature = "dev", allow(unstable_features))]
-#![cfg_attr(feature = "dev", feature(plugin))]
-#![cfg_attr(feature = "dev", plugin(clippy))]
-
-
-#![cfg_attr(all(not(test), not(fuzztarget), not(feature = "std")), no_std)]
+#![cfg_attr(all(not(test), not(feature = "std")), no_std)]
 #![cfg_attr(all(test, feature = "unstable"), feature(test))]
 
 #[macro_use]
 pub extern crate secp256k1_sys;
 pub use secp256k1_sys as ffi;
 
-#[cfg(feature = "bitcoin_hashes")] extern crate bitcoin_hashes;
+#[cfg(feature = "bitcoin_hashes")] pub extern crate bitcoin_hashes;
 #[cfg(all(test, feature = "unstable"))] extern crate test;
 #[cfg(any(test, feature = "rand"))] pub extern crate rand;
 #[cfg(any(test))] extern crate rand_core;
@@ -575,9 +548,7 @@ impl fmt::Display for Error {
 }
 
 #[cfg(feature = "std")]
-impl std::error::Error for Error {
-    fn description(&self) -> &str { self.as_str() }
-}
+impl std::error::Error for Error {}
 
 
 /// The secp256k1 engine, used to execute all signature operations
@@ -676,7 +647,7 @@ impl<C: Context> Secp256k1<C> {
             // However, if this DOES fail, the result is potentially weaker side-channel
             // resistance, which is deadly and undetectable, so we take out the entire
             // thread to be on the safe side.
-            assert!(err == 1);
+            assert_eq!(err, 1);
         }
     }
 
@@ -723,13 +694,8 @@ impl<C: Verification> Secp256k1<C> {
     /// verify-capable context.
     ///
     /// ```rust
-    /// # extern crate secp256k1;
-    /// # #[cfg(feature="rand")]
-    /// # extern crate rand;
-    /// #
-    /// # fn main() {
     /// # #[cfg(feature="rand")] {
-    /// # use rand::OsRng;
+    /// # use secp256k1::rand::rngs::OsRng;
     /// # use secp256k1::{Secp256k1, Message, Error};
     /// #
     /// # let secp = Secp256k1::new();
@@ -742,7 +708,7 @@ impl<C: Verification> Secp256k1<C> {
     ///
     /// let message = Message::from_slice(&[0xcd; 32]).expect("32 bytes");
     /// assert_eq!(secp.verify(&message, &sig, &public_key), Err(Error::IncorrectSignature));
-    /// # } }
+    /// # }
     /// ```
     #[inline]
     pub fn verify(&self, msg: &Message, sig: &Signature, pk: &key::PublicKey) -> Result<(), Error> {
@@ -769,9 +735,9 @@ fn from_hex(hex: &str, target: &mut [u8]) -> Result<usize, ()> {
     for c in hex.bytes() {
         b <<= 4;
         match c {
-            b'A'...b'F' => b |= c - b'A' + 10,
-            b'a'...b'f' => b |= c - b'a' + 10,
-            b'0'...b'9' => b |= c - b'0',
+            b'A'..=b'F' => b |= c - b'A' + 10,
+            b'a'..=b'f' => b |= c - b'a' + 10,
+            b'0'..=b'9' => b |= c - b'0',
             _ => return Err(()),
         }
         if (idx & 1) == 1 {