You typically want a slightly-more-elaborate approach than just handing the network a hash and then getting a file.

[…]

Blake 3 supports verified streaming as it is built upon merkle trees as you described. So is IPFS. As I mentioned, IPFS hashes are that of the tree, not the file contents themselves, but that doesn’t help when you have a SHA256 sum of a file and want to download it. Maybe there are networks that map the SHA256 sum to a blake3 sum, an IPFS CID, or even an HTTP URI, but I don’t know of one, hence the question here.

BitTorrent and Hyphanet have mechanisms that do this.

Do you know of a way to exploit that? A library maybe?

It’s quite simple: I want to retrieveFile(fileHash) where fileHash is the output of md5sum $file or sha256sum $file, or whatever other hashing algorithm exists.

I’m not sure what your concern is. I’d basically like to call a function retrieveFile(fileHash) and get bytes back. Or call retrieveFileLocations(fileHash) and get URIs back to where the file can be downloaded. Also, it’ll be opensource, so nothing to reverse engineer.

How do I retrieve a file from bittorrent with just its hash? Does WebMirror solve that? I’ll have a look at it…

If you sha256sum $file and send that hash to somebody, they can’t download the file from IPFS (unless it’s <2MB IINM), that’s the problem. And it can be any hashing algorithm md5, blake, whatever.

Sure, why not. I’m not the creator of the room 🙂

I know that @Ategon@programming.dev is there. Maybe he can make you a mod there too? And the channel could be added to the sidebar of this community too.

This week some more work was done on inheriteRS to support inheriting non-trait implementations of functions.

Basically

use inheriters::specialisations;

specialisations!(
    struct Parent {
        attr1: u8,
    }
    impl Parent {
        fn from_parent(self) -> u8 { 8 }
        fn overridden(self) -> u8 { self.attr1 }
    }
    
    #[inherit(Child)]
    struct Child {
        attr2: u8,
    }
    impl Child {
        fn overridden(self) -> u8 { self.attr2 }
    }
);

results in

struct Parent {
    attr1: u8,
}
impl Parent {
    fn from_parent(self) -> u8 { 8 }
    fn overridden(self) -> u8 { self.attr1 }
}


struct Child {
    attr1: u8, // new
    attr2: u8,
}
impl Child {
    fn from_parent(self) -> u8 { 8 } // new
    fn overridden(self) -> u8 { self.attr2 }
}

There might be some clean-up necessary code-wise and the README has to be expanded. But the project is well on its way to version 1! It’s a pity codeberg doesn’t have easy CI/CD yet nor domain hosting e.g inheriters.codeberg.io or something. So auto-formatting, testing, auto-tagging, etc. will have to come once I can convince myself to setup a VPS somewhere that hosts all that.

That sounds like fun! Wow. How stable is it at the moment?

Working on some form of inheritance in rust. It’s my first foray into procedural macros and so far it’s fun. The idea is quite simple: generate structs with common attributes (and eventually functions) instead writing them yourself.

use inheriters::specialisations;

specialisations!(
    struct Parent {
        attr1: u8,
    }
    #[inherit(Child)]
    struct Child {
        attr2: u8,
    }
);

becomes

struct Parent {
    attr1: u8,
}
struct Child {
    attr1: u8,
    attr2: u8,
}

not

struct Parent {
    attr1: u8,
}
struct Child {
    attr1: u8,
    parent: Parent,
}

The latter leads to indirection which I’m not a fan of.

Last week I squashed one bug on the order of attributes according to inheritance. In the example above attr2 was coming before attr1. A feature is nearly done to exclude the Parent from the output and only output the child. That’s useful for parents that just serve as holders for shared attributes.

The goal for v1 was to also support basic inheritance of implementations: Parent has an impl block, then that block is copied for the Child. Not sure yet if I’ll implement overrides in v1 or v2. Overrides being if Parent implements do_something() and Child does too, then the implementation of Parent is not copied into the impl block.
That’s what I’ll try to tackle in the coming weeks.

Jottacloud is what I want to use. Unlimited storage for ~100€/month

Close behind is 1fichier for 2€/TB/month or 12€/TB/year, but they are in France and “uptobox” (a similar provider) was shutdown by the US on French soil because they allowed providing links to the files.

You can probably find others in the list of storage systems supported by rclone