123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.// Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.import { default as randomBytes } from "./_crypto/randomBytes.ts";import {  crypto as wasmCrypto,  DigestAlgorithm,  digestAlgorithms,} from "../_wasm_crypto/mod.ts";import { pbkdf2, pbkdf2Sync } from "./_crypto/pbkdf2.ts";import { Buffer } from "./buffer.ts";import { Transform } from "./stream.ts";import { TransformOptions } from "./_stream/transform.ts";import { encode as encodeToHex } from "../encoding/hex.ts";import { encode as encodeToBase64 } from "../encoding/base64.ts";
const coerceToBytes = (data: string | BufferSource): Uint8Array => {  if (data instanceof Uint8Array) {    return data;  } else if (typeof data === "string") {    // This assumes UTF-8, which may not be correct.    return new TextEncoder().encode(data);  } else if (ArrayBuffer.isView(data)) {    return new Uint8Array(      data.buffer,      data.byteOffset,      data.byteLength,    );  } else if (data instanceof ArrayBuffer) {    return new Uint8Array(data);  } else {    throw new TypeError("expected data to be string | BufferSource");  }};
/** * The Hash class is a utility for creating hash digests of data. It can be used in one of two ways: * * - As a stream that is both readable and writable, where data is written to produce a computed hash digest on the readable side, or * - Using the hash.update() and hash.digest() methods to produce the computed hash. * * The crypto.createHash() method is used to create Hash instances. Hash objects are not to be created directly using the new keyword. */export class Hash extends Transform {  #context: wasmCrypto.DigestContext;
  constructor(    algorithm: string | wasmCrypto.DigestContext,    _opts?: TransformOptions,  ) {    super({      transform(chunk: string, _encoding: string, callback: () => void): void {        context.update(coerceToBytes(chunk));        callback();      },      flush(callback: () => void): void {        this.push(context.digest(undefined));        callback();      },    });
    if (typeof algorithm === "string") {      // Node/OpenSSL and WebCrypto format some digest names differently;      // we attempt to handle those here.      algorithm = algorithm.toUpperCase();      if (opensslToWebCryptoDigestNames[algorithm]) {        algorithm = opensslToWebCryptoDigestNames[algorithm];      }      this.#context = new wasmCrypto.DigestContext(        algorithm as DigestAlgorithm,      );    } else {      this.#context = algorithm;    }
    const context = this.#context;  }
  copy(): Hash {    return new Hash(this.#context.clone());  }
  /**   * Updates the hash content with the given data.   */  update(data: string | ArrayBuffer, _encoding?: string): this {    let bytes;    if (typeof data === "string") {      data = new TextEncoder().encode(data);      bytes = coerceToBytes(data);    } else {      bytes = coerceToBytes(data);    }
    this.#context.update(bytes);
    return this;  }
  /**   * Calculates the digest of all of the data.   *   * If encoding is provided a string will be returned; otherwise a Buffer is returned.   *   * Supported encoding is currently 'hex', 'binary', 'base64'.   */  digest(encoding?: string): Buffer | string {    const digest = this.#context.digest(undefined);    if (encoding === undefined) {      return Buffer.from(digest);    }
    switch (encoding) {      case "hex":        return new TextDecoder().decode(encodeToHex(new Uint8Array(digest)));      case "binary":        return String.fromCharCode(...digest);      case "base64":        return encodeToBase64(digest);      default:        throw new Error(          `The output encoding for hash digest is not implemented: ${encoding}`,        );    }  }}
/** * Supported digest names that OpenSSL/Node and WebCrypto identify differently. */const opensslToWebCryptoDigestNames: Record<string, DigestAlgorithm> = {  "BLAKE2B512": "BLAKE2B",  "BLAKE2S256": "BLAKE2S",  "RIPEMD160": "RIPEMD-160",  "RMD160": "RIPEMD-160",  "SHA1": "SHA-1",  "SHA224": "SHA-224",  "SHA256": "SHA-256",  "SHA384": "SHA-384",  "SHA512": "SHA-512",};
/** * Creates and returns a Hash object that can be used to generate hash digests * using the given `algorithm`. Optional `options` argument controls stream behavior. */export function createHash(  algorithm: string,  opts?: TransformOptions,) {  return new Hash(algorithm, opts);}
/** * Returns an array of the names of the supported hash algorithms, such as 'sha1'. */export function getHashes(): readonly string[] {  return digestAlgorithms;}
export default { Hash, createHash, getHashes, pbkdf2, pbkdf2Sync, randomBytes };export { pbkdf2, pbkdf2Sync, randomBytes };