# computeSha256 static method

String computeSha256(

1. Uint8List? data

)

Computes SHA256.

param data Input data. return The result. throws BiosealException An error has occurred during Bioseal Library execution.

## Implementation

    static String computeSha256(Uint8List? data) {
      Pointer<UnsignedChar>? pData;
      if (data != null) {
      	pData = calloc.allocate<UnsignedChar>(data.length);
      	pData.cast<Uint8>().asTypedList(data.length).setAll(0, data);
      }
      Pointer<Char> pResult = nullptr;
      Pointer<Int> pResultSize = calloc.allocate(1);
      pResultSize[0] = -1;
      try {
        var err = biosealSDK.id3Bioseal_ComputeSha256(pData ?? nullptr, data?.length ?? 0, pResult, pResultSize);
        if (err == BiosealError.insufficientBuffer.value) {
          pResult = calloc.allocate(pResultSize.value);
          err = biosealSDK.id3Bioseal_ComputeSha256(pData ?? nullptr, data?.length ?? 0, pResult, pResultSize);
          if (err != BiosealError.success.value) {
            throw BiosealException(err);
          }
        }
        final vResult = utf8.decode(Uint8List.fromList(pResult.cast<Uint8>().asTypedList(pResultSize.value)));
        return vResult;
      } finally {
        if (pData != null) {
          calloc.free(pData);
        }
        calloc.free(pResult);
        calloc.free(pResultSize);
      }
    }