cdk-s3-vectors/node_modules/@aws-crypto/sha256-browser/src/crossPlatformSha256.ts

A CDK construct library for Amazon S3 Vectors. This construct simplifies the creation of vector buckets, vector indexes with full configuration options, and Amazon Bedrock knowledge bases using S3 Vectors as the underlying vector store.

import { Sha256 as WebCryptoSha256 } from "./webCryptoSha256";
import { Sha256 as JsSha256 } from "@aws-crypto/sha256-js";
import { Checksum, SourceData } from "@aws-sdk/types";
import { supportsWebCrypto } from "@aws-crypto/supports-web-crypto";
import { locateWindow } from "@aws-sdk/util-locate-window";
import { convertToBuffer } from "@aws-crypto/util";

export class Sha256 implements Checksum {
  private hash: Checksum;

  constructor(secret?: SourceData) {
    if (supportsWebCrypto(locateWindow())) {
      this.hash = new WebCryptoSha256(secret);
    } else {
      this.hash = new JsSha256(secret);
    }
  }

  update(data: SourceData, encoding?: "utf8" | "ascii" | "latin1"): void {
    this.hash.update(convertToBuffer(data));
  }

  digest(): Promise<Uint8Array> {
    return this.hash.digest();
  }

  reset(): void {
    this.hash.reset();
  }
}