Backend half

SerpentRace_Backend/node_modules/@aws-crypto/crc32/src/aws_crc32.ts

@@ -0,0 +1,24 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { SourceData, Checksum } from "@aws-sdk/types";
+import { convertToBuffer, isEmptyData, numToUint8 } from "@aws-crypto/util";
+import { Crc32 } from "./index";
+
+export class AwsCrc32 implements Checksum {
+  private crc32 = new Crc32();
+
+  update(toHash: SourceData) {
+    if (isEmptyData(toHash)) return;
+
+    this.crc32.update(convertToBuffer(toHash));
+  }
+
+  async digest(): Promise<Uint8Array> {
+    return numToUint8(this.crc32.digest());
+  }
+
+  reset(): void {
+    this.crc32 = new Crc32();
+  }
+}