Remove the crypto factories

pkg/crypto/lib/crypto.dart

Index: pkg/crypto/lib/crypto.dart
diff --git a/pkg/crypto/lib/crypto.dart b/pkg/crypto/lib/crypto.dart
index dad82111f5093cc309c2a5a932f599483b7684c2..78b2642dde88be3b3c94f21d47e092a773a569a1 100644
--- a/pkg/crypto/lib/crypto.dart
+++ b/pkg/crypto/lib/crypto.dart
@@ -54,72 +54,6 @@ abstract class Hash {
 }
 
 /**
- * SHA1 hash function implementation.
- */
-class SHA1 implements Hash {
-  factory SHA1() => new _SHA1();
-}
-
-/**
- * SHA256 hash function implementation.
- */
-class SHA256 implements Hash {
-  factory SHA256() => new _SHA256();
-}
-
-/**
- * MD5 hash function implementation.
- *
- * WARNING: MD5 has known collisions and should only be used when
- * required for backwards compatibility.
- */
-class MD5 implements Hash {
-  factory MD5() => new _MD5();
-}
-
-/**
- * Hash-based Message Authentication Code support.
- *
- * The [add] method is used to add data to the message. The [digest] and
- * [close] methods are used to extract the message authentication code.
- */
-// TODO(floitsch): make Hash implement Sink, EventSink or similar.
-class HMAC {
-  /**
-   * Create an [HMAC] object from a [Hash] and a key.
-   */
-  factory HMAC(Hash hash, List<int> key) => new _HMAC(hash, key);
-
-  /**
-   * Add a list of bytes to the message.
-   */
-  add(List<int> data);
-
-  /**
-   * Perform the actual computation and extract the message digest
-   * as a list of bytes.
-   */
-  List<int> close();
-
-  /**
-   * Extract the message digest as a list of bytes without closing [this].
-   */
-  List<int> get digest;
-
-  /**
-   * Verify that the HMAC computed for the data so far matches the
-   * given message digest.
-   *
-   * This method should be used instead of memcmp-style comparisons
-   * to avoid leaking information via timing.
-   *
-   * Throws an exception if the given digest does not have the same
-   * size as the digest computed by this HMAC instance.
-   */
-  bool verify(List<int> digest);
-}
-
-/**
  * Utility methods for working with message digests.
  */
 class CryptoUtils {