Implement Hash for PublicKey.

src/ffi.rs

@@ -17,6 +17,8 @@
 //! Direct bindings to the underlying C library functions. These should
 //! not be needed for most users.
 use std::mem;
+use std::hash;
+
 use libc::{c_int, c_uchar, c_uint, c_void, size_t};
 
 /// Flag for context to enable no precomputation
@@ -65,6 +67,12 @@ impl PublicKey {
     pub unsafe fn blank() -> PublicKey { mem::uninitialized() }
 }
 
+impl hash::Hash for PublicKey {
+    fn hash<H: hash::Hasher>(&self, state: &mut H) {
+        state.write(&self.0)
+    }
+}
+
 /// Library-internal representation of a Secp256k1 signature
 #[repr(C)]
 pub struct Signature([c_uchar; 64]);

src/key.rs

@@ -39,9 +39,10 @@ pub static ONE: SecretKey = SecretKey([0, 0, 0, 0, 0, 0, 0, 0,
                                        0, 0, 0, 0, 0, 0, 0, 1]);
 
 /// A Secp256k1 public key, used for verification of signatures
-#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
 pub struct PublicKey(ffi::PublicKey);
 
+
 fn random_32_bytes<R: Rng>(rng: &mut R) -> [u8; 32] {
     let mut ret = [0u8; 32];
     rng.fill_bytes(&mut ret);