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Multiformats.Hash (cs-multihash)

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Multihash implementation in C# .NET Standard 1.6 compliant.

This is not a general purpose hashing library, but a library to encode/decode Multihashes which is a "container" describing what hash algorithm the digest is calculated with. The library also support calculating the digest, but that is not it's main purpose. If you're looking for a library that supports many algorithms and only want the raw digest, try BouncyCastle or the built-ins of the .net framework.

To be clear, when you calculate a digest (using Sum) with this library, you will get a byte array including a prefix with the properties of the algorithm used (type and length).

There's a CLI version that you can use to compute files or direct input from the command line. This CLI tool passes the sharness tests here.

Table of Contents


PM> Install-Package Multiformats.Hash

dotnet add package Multiformats.Hash


// decode a multihash formatted byte array
Multihash mh = Multihash.Decode(bytes);

// decode a multihash formatted string
Multihash mh = Multihash.Parse(str);
bool ok = Multihash.TryParse(str, out mh);

// encode a digest to multiformat byte array
byte[] bytes = Multihash.Encode(digest, HashType.SHA1);
byte[] bytes = Multihash.Encode<SHA1>(digest);

// calculate digest
Multihash mh = Multihash.Sum<SHA1>(bytes);

// verify
bool isValid = mh.Verify(bytes);

Supported hash algorithms

  • ID
  • MD4
  • MD5
  • SHA1
  • SHA2_256
  • SHA2_512
  • SHA3_224
  • SHA3_256
  • SHA3_384
  • SHA3_512
  • SHAKE_128
  • SHAKE_256
  • KECCAK_224
  • KECCAK_256
  • KECCAK_384
  • KECCAK_512
  • BLAKE2B-(bits) (8-512)
  • BLAKE2S-(bits) (8-256)
  • DBL_SHA2_256
  • MURMUR3_32/128
  • SKEIN256-(bits) (8-256)
  • SKEIN512-(bits) (8-512)
  • SKEIN1024-(bits) (8-1024)


Captain: @tabrath.


Contributions welcome. Please check out the issues.

Check out our contributing document for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS Code of Conduct.

Small note: If editing the README, please conform to the standard-readme specification.


MIT © 2017-2018 Trond Bråthen