elliptic-curve: add alloc feature + EncodedPoint::to_bytes()

elliptic-curve/Cargo.toml

@@ -26,10 +26,11 @@ hex-literal = "0.2"
 
 [features]
 default = ["rand"]
+alloc = []
 ecdh = ["rand", "weierstrass", "zeroize"]
 rand = ["rand_core"]
 weierstrass = []
-std = []
+std = ["alloc"]
 
 [package.metadata.docs.rs]
 all-features = true

elliptic-curve/src/ecdh.rs

@@ -7,8 +7,8 @@
 //! # Usage
 //!
 //! Have each participant generate an [`EphemeralSecret`] value, compute the
-//! [`EncodedPoint`] for that value, exchange public keys, then each participant
-//! uses their [`EphemeralSecret`] and the other participant's [`EncodedPoint`]
+//! [`PublicKey'] for that value, exchange public keys, then each participant
+//! uses their [`EphemeralSecret`] and the other participant's [`PublicKey`]
 //! to compute a [`SharedSecret`] value.
 //!
 //! # ⚠️ SECURITY WARNING ⚠️

elliptic-curve/src/lib.rs

@@ -19,6 +19,9 @@
  html_root_url = "https://docs.rs/elliptic-curve/0.5.0"
 )]
 
+#[cfg(feature = "alloc")]
+extern crate alloc;
+
 #[cfg(feature = "std")]
 extern crate std;
 

elliptic-curve/src/sec1.rs

@@ -17,6 +17,9 @@ use generic_array::{
 };
 use subtle::CtOption;
 
+#[cfg(feature = "alloc")]
+use alloc::boxed::Box;
+
 #[cfg(feature = "zeroize")]
 use zeroize::Zeroize;
 
@@ -120,11 +123,17 @@ where
  }
 
  /// Get byte slice containing the serialized [`EncodedPoint`].
- #[inline]
  pub fn as_bytes(&self) -> &[u8] {
  &self.bytes[..self.len()]
  }
 
+ /// Get boxed byte slice containing the serialized [`EncodedPoint`]
+ #[cfg(feature = "alloc")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
+ pub fn to_bytes(&self) -> Box<[u8]> {
+ self.as_bytes().to_vec().into_boxed_slice()
+ }
+
  /// Compress this [`EncodedPoint`], returning a new [`EncodedPoint`].
  pub fn compress(&self) -> Self {
  if self.tag().is_compressed() {
@@ -448,4 +457,11 @@ mod tests {
  let compressed_point = uncompressed_point.compress();
  assert_eq!(compressed_point.as_bytes(), &COMPRESSED_BYTES[..]);
  }
+
+ #[cfg(feature = "alloc")]
+ #[test]
+ fn to_bytes() {
+ let uncompressed_point = EncodedPoint::from_bytes(&UNCOMPRESSED_BYTES[..]).unwrap();
+ assert_eq!(&*uncompressed_point.to_bytes(), &UNCOMPRESSED_BYTES[..]);
+ }
 }