ic_data_hash function

Uint8List ic_data_hash(dynamic datastructure)

Computes the representation-independent-hash of the data.

Implementation

Uint8List ic_data_hash(dynamic datastructure) {
    //print(datastructure);
    //print(datastructure.runtimeType);
    var valueforthehash = <int>[];
    if (datastructure is String) {
        valueforthehash = utf8.encode(datastructure); }
    else if (datastructure is int || datastructure is BigInt) {
        valueforthehash = leb128.encodeUnsigned(datastructure); }
    else if (datastructure is Uint8List) {
        valueforthehash= datastructure; }
    else if (datastructure is List) {
        valueforthehash= datastructure.fold(<int>[], (p,c)=> p + ic_data_hash(c)); }
    else if (datastructure is Map) {
        List<List<int>> datafieldshashs = [];
        for (String key in datastructure.keys) {
            List<int> fieldhash = [];
            fieldhash.addAll(sha256.convert(ascii.encode(key)).bytes);
            fieldhash.addAll(ic_data_hash(datastructure[key]));
            datafieldshashs.add(fieldhash);
        }
        datafieldshashs.sort((a,b) => bytes_as_the_bitstring(a).compareTo(bytes_as_the_bitstring(b)));
        valueforthehash = datafieldshashs.fold(<int>[],(p,c)=>p+c); }
    else {
        throw Exception('ic_data_hash: check: type of the datastructure: ${datastructure.runtimeType}');
    }
    return Uint8List.fromList(sha256.convert(valueforthehash).bytes);
}