feat: Add AwsCrc32C Hash

Add an AwsCrc32C object that implements
@aws-sdk/types::Hash

packages/crc32c/package.json

@@ -19,7 +19,9 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "tslib": "^1.11.1"
+    "tslib": "^1.11.1",
+    "@aws-sdk/types": "^3.1.0",
+    "@aws-crypto/util": "file:../util"
   },
   "publishConfig": {
     "access": "public"

packages/crc32c/src/aws_crc32c.ts

@@ -0,0 +1,20 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { Hash, SourceData } from "@aws-sdk/types";
+import { convertToBuffer, isEmptyData, numToUint8 } from "@aws-crypto/util";
+import { Crc32c } from "./index";
+
+export class AwsCrc32c implements Hash {
+  private readonly crc32c = new Crc32c();
+
+  update(toHash: SourceData) {
+    if (isEmptyData(toHash)) return;
+
+    this.crc32c.update(convertToBuffer(toHash));
+  }
+
+  async digest(): Promise<Uint8Array> {
+    return numToUint8(this.crc32c.digest());
+  }
+}

packages/crc32c/src/index.ts

@@ -54,3 +54,5 @@ const lookupTable = Uint32Array.from([
   0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81, 0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
   0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E, 0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351,
 ]);
+
+export { AwsCrc32c } from "./aws_crc32c";