multihash | C Implementation of Multihash | Compression library

by lockblox C++ Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(6)Vulnerabilities Install Support

kandi X-RAY | multihash Summary

multihash is a C++ library typically used in Utilities, Compression applications. multihash has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

multihash implementation in c++. Multihash is delivered as.

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Support

multihash has a low active ecosystem.

It has 8 star(s) with 2 fork(s). There are 3 watchers for this library.

It had no major release in the last 6 months.

There are 1 open issues and 2 have been closed. On average issues are closed in 2 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of multihash is current.

Quality

multihash has no bugs reported.

Security

multihash has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

multihash is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

multihash releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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multihash Key Features

No Key Features are available at this moment for multihash.

multihash Examples and Code Snippets

No Code Snippets are available at this moment for multihash.

Community Discussions

Trending Discussions on multihash

What is multicodec and how it is related to multihash?

Node-less way to generate a CID that matches IPFS-Desktop CID

Why IPFS's multihash can decode?

Failed to verify dex: Bad method handle type 7

Base58 javascript implementation

How recreate a hash digest of a multihash in IPFS

QUESTION

What is multicodec and how it is related to multihash?

Asked 2021-Apr-09 at 15:23

I don't have any background with this subject.

To try to understand them better, I read:

Multihash

CIDv1: Multicodec prefix

From what I understand, the multihash is the algorithm used to hash (one way) the value. so it means, we can't go back (we can't decode the hash to the value).

Questions

I don't understand, in simple words, what is multicodec and if it's related to decoding the hash to a value (which makes no sense).
what is the motivation to multicodec prefix?

...

ANSWER

Answered 2021-Apr-09 at 15:23

The multicodec is related to decoding the value the hash points to, if that makes it easier to understand. Don't worry, no magic hash decoding is happening ;). Remember we're making CIDs, and we can use CIDs to lookup content. However then we have the question of "how do we decode this data we just retrieved?", the multicodec solves that problem for us. Reading From Data to Data Structures might help clear up some confusion.
The multicodec prefix allows IPFS to evolve to support new and different encodings for the data that's actually put into IPFS. This refers to IPLD, and you can actually find the answer you're looking for under Links (with information about the codecs under Codecs):

For links we use a CID. A CID is an extension of multihash, in fact a multihash is part of a CID. We simply add a codec to a multihash that tells us what format the data is in (JSON, CBOR, Bitcoin, Ethereum, etc). This way, we can actually link between data in different formats and any link to data anyone ever gives us can be decoded so that it can become more than just a series of bytes.

CID is a standard that anyone can implement, even people that have no other interest in IPLD beyond the need for hash links to different data types can use it.

Source https://stackoverflow.com/questions/67020732

QUESTION

Node-less way to generate a CID that matches IPFS-Desktop CID

Asked 2020-Feb-05 at 20:08

I'd like to generate a CID (Content identifier) for a file in javascript without having access to an IPFS node or the internet. I've tried using js-multihashing-async to first hash the file and js-cid to generate a CID from the hash but I get a different CID than if I just add the file to ipfs-desktop. It looks like the problem is an IPFS node chunks data and the CID is for the DAG that links the files' chunks. I've tried this library but it doesn't produce the same CID as ipfs-desktop does for the same file. This question is essentially the same as mine but none of the answers give a CID that matches the ipfs-desktop-generated CID.

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ANSWER

Answered 2020-Feb-04 at 15:27

ipfs-only-hash is the right module to use to create an IPFS CID from a file or a Buffer, without needing to start an IPFS daemon. For the same input file and the same options, it should produce the same CID.

This example is from the ipfs-only-hash tests, where it verifies that it hashes the same buffer to the same CID as a js-ipfs node does.

Source https://stackoverflow.com/questions/60046604

QUESTION

Why IPFS's multihash can decode?

Asked 2019-Aug-25 at 11:49

I have read this stackoverflow post: How to create an IPFS compatible multihash

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ANSWER

Answered 2019-Aug-21 at 02:46

Basicly, IPFS is a (key, value) storage service. The multihash you get from ipfs add command is the multihash of the value, also the key to retrieve the value from IPFS service with ipfs get or ipfs object commands.

With http api of IPFS service, curl "https://ipfs.infura.io:5001/api/v0/object/data?arg=key works exactly same as ipfs object data command.

So it is not about decoding the hash, it is just get the value with you key(the multihash).

Source https://stackoverflow.com/questions/57523200

QUESTION

Failed to verify dex: Bad method handle type 7

Asked 2019-Aug-13 at 07:28

I'm trying to create a test example where I've the contents of a TextView is set to the contents of a file stored in the IPFS.

I'm using this repository for my functions: https://github.com/ipfs/java-ipfs-api

I keep getting what appears to be a multidex error despit enable multidex in multiple places:

...

ANSWER

Answered 2018-May-11 at 09:13

Your code doesn't matter. The error is "Failed to open dex files [...] Bad method handle type 7".

MethodHandleType is defined in art/libdexfile/dex/dex_file.h

Source https://stackoverflow.com/questions/50121367

QUESTION

Base58 javascript implementation

Asked 2019-May-18 at 00:08

I am using IPFS-multihash method to store IPFS hash in smart contracts. For that I need to decode base58 format:

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ANSWER

Answered 2019-May-10 at 09:03

For me, it worked by using Base58 implementation and converting the resulting result into hex.

Source https://stackoverflow.com/questions/56073688

QUESTION

How recreate a hash digest of a multihash in IPFS

Asked 2019-Apr-11 at 13:45

Assuming I'm adding data to IPFS like this:

...

ANSWER

Answered 2018-Aug-02 at 16:41

I'm not sure what that encoding is but you can unmarshal the dag data field like this in js-ipfs:

Source https://stackoverflow.com/questions/51655352

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install multihash

You can download it from GitHub.

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For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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