diff --git a/Lib/test/test_binascii.py b/Lib/test/test_binascii.py
@@ -258,8 +258,6 @@ def test_hex(self):
        self.assertEqual(binascii.hexlify(self.type2test(s)), t)
        self.assertEqual(binascii.unhexlify(self.type2test(t)), u)

-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
    def test_hex_separator(self):
        """Test that hexlify and b2a_hex are binary versions of bytes.hex."""
        # Logic of separators is tested in test_bytes.py.  This checks that
@@ -388,8 +386,6 @@ def test_empty_string(self):
            except Exception as err:
                self.fail("{}({!r}) raises {!r}".format(func, empty, err))

-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
    def test_unicode_b2a(self):
        # Unicode strings are not accepted by b2a_* functions.
        for func in set(all_functions) - set(a2b_functions):

diff --git a/stdlib/src/binascii.rs b/stdlib/src/binascii.rs
@@ -43,14 +43,120 @@ mod decl {

    #[pyfunction(name = "b2a_hex")]
    #[pyfunction]
-    fn hexlify(data: ArgBytesLike) -> Vec<u8> {
        data.with_ref(|bytes| {
-            let mut hex = Vec::<u8>::with_capacity(bytes.len() * 2);
-            for b in bytes {
-                hex.push(hex_nibble(b >> 4));
-                hex.push(hex_nibble(b & 0xf));
            }
-            hex
        })
    }

@@ -368,7 +474,7 @@ mod decl {
    #[derive(FromArgs)]
    struct B2aQpArgs {
        #[pyarg(any)]
-        data: ArgAsciiBuffer,
        #[pyarg(named, default = false)]
        quotetabs: bool,
        #[pyarg(named, default = true)]