Adding upstream version 1.6.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

src/openssl_sha256.rs

@@ -0,0 +1,15 @@
+use crate::CalculatorSelector;
+
+pub type OpenSslSha256 = openssl::sha::Sha256;
+
+impl CalculatorSelector for OpenSslSha256 {
+    type FinishType = [u8; 32];
+
+    fn update_inner(&mut self, data: &[u8]) {
+        self.update(data)
+    }
+
+    fn finish_inner(self) -> Self::FinishType {
+        self.finish()
+    }
+}