Re: GLib.Hmac unusable?

[Andrea Giammarchi <andrea giammarchi gmail com>]

Thanks Alan,

  I've tried them "all" but nothing seems to work:

```js

const GLib = imports.gi.GLib;

// this works

// https://developer.gnome.org/glib/2.48/glib-Data-Checksums.html#g-compute-checksum-for-data

GLib.compute_checksum_for_data(

  GLib.ChecksumType.SHA1,

  'the string',

  'the string'.length

);

// this doesn't

// https://developer.gnome.org/glib/2.48/glib-Data-HMACs.html#g-compute-hmac-for-data

GLib.compute_hmac_for_data(

  GLib.ChecksumType.SHA1,

  'secret',

  'secret'.length,

  'the string',

  'the string'.length

);

```

If I try to create `utf8` strings I have got:

```

Error: Unsupported type gint64 for (out caller-allocates)

```

so `GLib.utf16_to_utf8` is not usable here.

Should I file a bug?

Best Regards

On Wed, Apr 20, 2016 at 4:45 AM, Alan Knowles <alan roojs com> wrote:

Andrea,

probably worth trying this.

Syntax:
GLib.compute_hmac_for_string (ChecksumType digest_type, String key, guint64 key_len, String str, gint64 length) : String

var out = GLib.compute_hmac_for_string (
    GLib.Checksum.SHA1,
   'secret',
  'secret'.length,
  'the string',
  'the string'.length
) 

The doc's indicate that the last arg can be -1 if a \0 terminated string is passed - I can't remember if that occurs by default though.

Otherwise it might be worth messing around with the gir file and changing the key into a utf8 string, rather than an array of chars

Regards
Alan

 



On Tuesday, April 19, 2016 05:19 PM, Andrea Giammarchi wrote:

Hello there,

  I wonder if I'm doing it wrong or if there's actually a bug in either GJS or the GLib I'm using.

While it's straight forward to `new GLib.Checksum(GLib.Checksum.SHA1);` and then use `.update(data)` and `.get_string()`, it's basically impossible to do the same with `GLib.Hmac`.

This is not exposed as constructor, so any attempt to `new GLib.Hmac` would fail, and on top of that, any attempt to use `GLib.compute_hmac_for_data` fails.

Example:

```js

GLib.compute_hmac_for_data(

  GLib.Checksum.SHA1,

  'secret',

  'secret'.length,

  'generic data content',

  GLib.checksum_type_get_length(GLib.Checksum.SHA1)

);

```

I'm not sure there's something wrong in my invoke but I keep having this kind of error, no matter how I shuffle those parameters (well, actually in some case I also have Segmentation fault (core dumped))

```

(gjs:7105): GLib-CRITICAL **: g_compute_hmac_for_data: assertion 'length == 0 || data != NULL' failed

null

```

Thanks in advance for any sort of outcome.

Best Regards

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