Make the crypto library an official dart:crypto library.

lib/crypto/crypto_vm.dart

Index: lib/crypto/crypto_vm.dart
diff --git a/lib/crypto/crypto_vm.dart b/lib/crypto/crypto_vm.dart
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// TODO(ager, iposva): Get rid of this file when the VM snapshot
+// generation can deal with normal library structure.
+
+#library('crypto');
+
+/**
+ * Interface for cryptographic hash functions.
+ *
+ * The [update] method is used to add data to the hash. The [digest] method
+ * is used to extract the message digest.
+ *
+ * Once the [digest] method has been called no more data can be added using the
+ * [update] method. If [update] is called after the first call to [digest] a
+ * HashException is thrown.
+ *
+ * If multiple instances of a given Hash is needed the [newInstance]
+ * method can provide a new instance.
+ */
+interface Hash {
+  /**
+   * Add a list of bytes to the hash computation.
+   */
+  Hash update(List<int> data);
+
+  /**
+   * Finish the hash computation and extract the message digest as
+   * a list of bytes.
+   */
+  List<int> digest();
+
+  /**
+   * Returns a new instance of this hash function.
+   */
+  Hash newInstance();
+
+  /**
+   * Block size of the hash in bytes.
+   */
+  int get blockSize();
+}
+
+/**
+ * SHA1 hash function implementation.
+ */
+interface SHA1 extends Hash default _SHA1 {
+  SHA1();
+}
+
+/**
+ * SHA256 hash function implementation.
+ */
+interface SHA256 extends Hash default _SHA256 {
+  SHA256();
+}
+
+/**
+ * MD5 hash function implementation.
+ *
+ * WARNING: MD5 has known collisions and should only be used when
+ * required for backwards compatibility.
+ */
+interface MD5 extends Hash default _MD5 {
+  MD5();
+}
+
+/**
+ * Hash-based Message Authentication Code support.
+ *
+ * The [update] method is used to add data to the message. The [digest] method
+ * is used to extract the message authentication code.
+ */
+interface HMAC default _HMAC {
+  /**
+   * Create an [HMAC] object from a [Hash] and a key.
+   */
+  HMAC(Hash hash, List<int> key);
+
+  /**
+   * Add a list of bytes to the message.
+   */
+  HMAC update(List<int> data);
+
+  /**
+   * Perform the actual computation and extract the message digest
+   * as a list of bytes.
+   */
+  List<int> digest();
+}
+
+/**
+ * Utility methods for working with message digests.
+ */
+class CryptoUtils {
+  /**
+   * Convert a list of bytes (for example a message digest) into a hex
+   * string.
+   */
+  static String bytesToHex(List<int> bytes) {
+    return _CryptoUtils.bytesToHex(bytes);
+  }
+}
+
+/**
+ * HashExceptions are thrown on invalid use of a Hash
+ * object.
+ */
+class HashException {
+  HashException(String this.message);
+  toString() => "HashException: $message";
+  String message;
+}
+