fixup compressor endianness handling

Author: kazcw

blake2/src/blake2.rs

@@ -84,10 +84,10 @@ macro_rules! blake2_compressor_impl {
             pub fn build(&self) -> $compressor {
                 assert!(self.digest_len > 0);
                 // All fields of both types are Copy.
-                // Endianness is handled at field-setting time.
+                // Field endianness is handled at field-setting time.
                 let h0: [$vec; 2] = unsafe { mem::transmute(*self) };
                 $compressor {
-                    h: [iv0() ^ h0[0], iv1() ^ h0[1]],
+                    h: [iv0() ^ h0[0].to_le(), iv1() ^ h0[1].to_le()],
                 }
             }
         }