hash function

Uint8List hash(dynamic content, { String algo = "sha256", })

Implementation

Uint8List hash(content, {String algo = "sha256"}) {
  if (!(content is Uint8List) && !(content is String)) {
    throw "'content' must be a string or Uint8List";
  }

  if (content is String) {
    if (isHex(content)) {
      content = hexToUint8List(content);
    } else {
      content = Uint8List.fromList(utf8.encode(content));
    }
  }

  switch (algo) {
    case "sha256":
      Digest sha256 = new Digest("SHA-256");
      return concatUint8List([
        new Uint8List.fromList([0]),
        sha256.process(content)
      ]);
    case "sha512":
      Digest sha512 = new Digest("SHA-512");
      return concatUint8List([
        new Uint8List.fromList([1]),
        sha512.process(content)
      ]);
    case "sha3-256":
      Digest sha3_256 = new Digest("SHA3-256");
      return concatUint8List([
        new Uint8List.fromList([2]),
        sha3_256.process(content)
      ]);
    case "sha3-512":
      Digest sha3_512 = new Digest("SHA3-512");
      return concatUint8List([
        new Uint8List.fromList([3]),
        sha3_512.process(content)
      ]);
    case "blake2b":
      Digest blake2b = new Digest("Blake2b");
      return concatUint8List([
        new Uint8List.fromList([4]),
        blake2b.process(content)
      ]);
    default:
      throw "Hash algorithm not supported";
  }
}