Update to rust-crypto 0.9.0, with breaking API changes

Cf. RustCrypto/traits#43 . I believe that we end up
re-exporting these APIs, so this is could be a breaking change for API
consumers, although it's not an API that we expect many people to be using
themselves.

src/digest.rs

@@ -94,7 +94,7 @@ impl FromStr for DigestData {
 impl From<DigestComputer> for DigestData {
     fn from(s: DigestComputer) -> DigestData {
         let mut result = DigestData::zeros();
-        let res = s.result();
+        let res = s.finalize();
         result.0.copy_from_slice(res.as_slice());
         result
     }

src/io/cached_itarbundle.rs

@@ -608,7 +608,7 @@ impl CachedITarBundle {
         let length = content.len();
 
         let mut digest_builder = digest::create();
-        digest_builder.input(&content);
+        digest_builder.update(&content);
 
         let digest = DigestData::from(digest_builder);
 

src/io/mod.rs

@@ -196,7 +196,7 @@ impl Read for InputHandle {
         self.ever_read = true;
         let n = self.inner.read(buf)?;
         if !self.read_only {
-            self.digest.input(&buf[..n]);
+            self.digest.update(&buf[..n]);
         }
         Ok(n)
     }
@@ -280,7 +280,7 @@ impl OutputHandle {
 impl Write for OutputHandle {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         let n = self.inner.write(buf)?;
-        self.digest.input(&buf[..n]);
+        self.digest.update(&buf[..n]);
         Ok(n)
     }