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flutter base64encode hash

I have a sha256 hash which is
5d753fd209b8cb9dff6801edbc60f2fdc00abff56bf3ef8c0f7cf9b975a2a1f9

and i know what i should get at the end which is this base64 encoded String
N7m2mKF7vY8tM8PVvkPONqnu5gdXWPm+vcT3lkpBWZ8=

but can’t figure out how to get this.
Just now i have tryed this

var hexString = '5d753fd209b8cb9dff6801edbc60f2fdc00abff56bf3ef8c0f7cf9b975a2a1f9';
var hexArray = HexUtils.decode(hexString);
var base64String = base64Encode(hexArray);
print('base64String: $base64String');

which print’s to the console

XXU/0gm4y53/aAHtvGDy/cAKv/Vr8++MD3z5uXWiofk=

what is not what i want. It should give me

N7m2mKF7vY8tM8PVvkPONqnu5gdXWPm+vcT3lkpBWZ8=

Any help is very much appreciated. Thank you so much.

I use the package basic_utils for HexUtils.decode and dart:convert for base64Encode

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2

Answers


  1. 0

    I think you should use <string>.codeUnits property to get the List<int> and use it for base64encode.
    Example

    var hexString = '5d753fd209b8cb9dff6801edbc60f2fdc00abff56bf3ef8c0f7cf9b975a2a1f9';
var base64String = base64Encode(hexString.codeUnits);
print('base64String: $base64String');

    Output :

    base64String: NWQ3NTNmZDIwOWI4Y2I5ZGZmNjgwMWVkYmM2MGYyZmRjMDBhYmZmNTZiZjNlZjhjMGY3Y2Y5Yjk3NWEyYTFmOQ==

    However, this is not 100% the same as you required. Tried using https://www.base64encode.org/, and encoded your hex string, the output is same as mine and not yours.

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  2. 0

    It looks like you’re on the right track, but there might be a small issue with how the hex string is being decoded. Let’s try a different approach to ensure the hex string is correctly converted to bytes before encoding it to base64.

    Here’s a complete example using Dart:

    import 'dart:convert';
import 'dart:typed_data';

void main() {
  var hexString = '5d753fd209b8cb9dff6801edbc60f2fdc00abff56bf3ef8c0f7cf9b975a2a1f9';
  
  // Convert hex string to bytes
  Uint8List hexToBytes(String hex) {
    var length = hex.length;
    var bytes = Uint8List(length ~/ 2);
    for (var i = 0; i < length; i += 2) {
      bytes[i ~/ 2] = int.parse(hex.substring(i, i + 2), radix: 16);
    }
    return bytes;
  }

  var bytes = hexToBytes(hexString);
  
  // Encode bytes to base64
  var base64String = base64Encode(bytes);
  print('base64String: $base64String');
}

    This should give you the correct base64 encoded string. Let me know if this works for you!

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