base58ToBinary function

Uint8List base58ToBinary(
  1. int size,
  2. String s
)

Convert an unsigned base-58 number in s to a bignum @param size bignum size (bytes)

Implementation

Uint8List base58ToBinary(int size, String s) {
  var result = new Uint8List(size);
  for (var i = 0; i < s.length; ++i) {
    var carry = base58Map[s.codeUnitAt(i)];
    if (carry < 0) {
      throw 'invalid base-58 value';
    }
    for (var j = 0; j < size; ++j) {
      var x = result[j] * 58 + carry;
      result[j] = x;
      carry = x >> 8;
    }
    if (carry != 0) {
      throw 'base-58 value is out of range';
    }
  }
  return Uint8List.fromList(result.reversed.toList());
}