How to hash a Tezos public key

Question

I need to create a Tezos public key hash based on a public ed25519 key only.

I am aware of an utility that generates entire keystore based on mnemonics - this is not what I need.

I'd welcome either a step by step description how to get from an edpk to a tz1 form or a code snippet.

Thanks.

Answer 1

Heres how to do it in python, where the variable pubkey is the bytes array of the public key

P2HASH_MAGIC = bytes.fromhex('06a1a4')
blake2bhash = blake2b(pubkey, digest_size=20).digest()
shabytes = sha256(sha256(P2HASH_MAGIC + blake2bhash).digest()).digest()[:4]
pkhash = b58encode(P2HASH_MAGIC + blake2bhash + shabytes).decode()

Answer 2

Do you have the tezos repo built? If yes, you can run the ocaml CLI with tezos-crypto:

 $ dune utop src/lib_crypto

and then:

ocaml# open Tezos_crypto;;
ocaml# Ed25519.Public_key.of_b58check_exn
           "edpkuoK2J2UVbDcSTdJgP85JmDN3gxBCswcgApbtY5d7zHVunwCKNR"
       |> Ed25519.Public_key.hash
       |> Ed25519.Public_key_hash.to_b58check;;                                                                                                                                                      
- : string = "tz1L1bypLzuxGHmx3d6bHFJ2WCi4ZDbocSCA"

Answer 3

In python, using the git version of pytezos:

from pytezos.crypto import Key

public_key = 'edpkuoK2J2UVbDcSTdJgP85JmDN3gxBCswcgApbtY5d7zHVunwCKNR'
hash = Key(public_key).public_key_hash()
print(hash)

Answer 4

In NodeJS it is also possible to do it using sotez:

import {Key} from 'sotez';

const sotezKey = new Key({ key: 'edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE' });
await sotezKey.ready;
console.log(sotezKey.publicKeyHash());

prints: tz1Xv78KMT7cHyVDLi9RmQP1KuWULHDafZdK