Cómo convertir ed25519 bytes a clave pública de Tezos

Intenté hacereso con base58 codificando ed255191bytes de clavepública. Considere unamuestra de código siguiente:

 const seed = crypto.randomBytes(32);
const keyPair = ed25519.MakeKeypair(seed);
const base58encoded = base58.encode(keyPair.publicKey);

console.log('ed25519 pub key bytes len: ' + keyPair.publicKey.length);
console.log('base58 pub key: ' + base58encoded);
console.log('base58 pub key len: ' + base58encoded.length);
console.log('actual key: edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE');
console.log('actual key len: ' + 'edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE'.length);
 

Imprime:

 ed25519 pub key bytes len: 32
base58 pub key: 6jRoreKb7RXAQZBuKZs7WDzsFHHrg62GkMmkXuiWqtKm
base58 pub key len: 44
actual key: edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE
actual key len: 54
 

Una cadena base58 que obtuvees 10 caracteresmás corta que una clavepública real de Tezos. Esto,ytambién esetema sugiere quenecesitoprefijarmis datos de ed25519 con algunosbytesmágicos antes de codificarlos con base58. ¿Qué sonesosbytesmágicos? ¿Hay documentación sobreeso?

Gracias.

EDITAR después de la respuesta de Arthur B:

Intenté agregarbytes deprefijo: \013\015\037\217 a ed25519bytes antes de que base58 los codifique. Aún así,tengo 49 caracteres cuando una clavepública real de Tezostiene 54 caracteres. Después de agregar 4bytes aleatorios adicionales,obtuve los 54 caracteres deseados y un valor que comienza con edpk. Claramente,esto significa queelprefijoes correcto,pero ¿de dónde obtengo los 4bytes restantes?

EDITAR después de la discusiónen los comentarios:

Faltaban 4bytesporque utilicé base58en lugar de base58check quetiene 4bytes adicionales como suma de comprobación. Después de usar base58check obtuve 55bytes comenzando con 1edpk - así que algo queparece una direcciónpública válida de Tezosprecedidapor un 1.

Elproblema actuales: cuandotrabajaba con la clave (específicamente,calculando su hash)eliminé un 1inicial y obtuve 54 caracteres. Como resultado,unabiblioteca queestoy usandopara aplicar un hash a una clave arrojó unerror Invalid checksum. Claramente,1esparte de la suma de comprobación base58check. Aún así,sino seelimina,la clavetendrá unprefijono válido. Unejemplo de código actualizado se ve así:

 const realKey = 'edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE';
const seed = crypto.randomBytes(32);
const keyPair = ed25519.MakeKeypair(seed);
const directPubKeyBytes = keyPair.publicKey;

const tezosPublicKeyPrefix = Buffer.from([13, 15, 37, 217]);
const prefixedPublicKey = Buffer.concat([tezosPublicKeyPrefix, directPubKeyBytes]);
const base58checkEncoded = base58check.encode(prefixedPublicKey).substr(1);

console.log('ed25519 pub key bytes len: ' + prefixedPublicKey.length);
console.log('base58 pub key: ' + base58checkEncoded);
console.log('base58 pub key len: ' + base58checkEncoded.length);
console.log('actual key len: ' + realKey.length);

const publicKey = new Key({ key: base58checkEncoded });
await publicKey.ready;
return publicKey.publicKeyHash();
 

Imprime:

 ed25519 pub key bytes len: 36
base58 pub key: edpkvCRxvpVG6FYAevL5Kqf4cQhaVAdyovGqrSCezHhNnav5BwjhuZ
base58 pub key len: 54
actual key len: 54
(node:12395) UnhandledPromiseRejectionWarning: Error: Invalid checksum
    at Object.decode (/home/kspisacki/coding/wallets/node_modules/bs58check/base.js:41:25)
    at Object.b58cdecode (/home/kspisacki/coding/wallets/node_modules/sotez/dist/node/index.js:1:12743)
    at z.<anonymous> (/home/kspisacki/coding/wallets/node_modules/sotez/dist/node/index.js:1:15122)
    at Generator.next (<anonymous>)
    at o (/home/kspisacki/coding/wallets/node_modules/sotez/dist/node/index.js:1:13324)

 

Cualquier ayuda adicional coneso seríamuy apreciada,ya quenoentiendo cómo hacer queestofuncione apesar de leer MUCHO sobreeltema;)

I tried to do that by base58 encoding ed255191 public key bytes. Consider a following code sample:

const seed = crypto.randomBytes(32);
const keyPair = ed25519.MakeKeypair(seed);
const base58encoded = base58.encode(keyPair.publicKey);

console.log('ed25519 pub key bytes len: ' + keyPair.publicKey.length);
console.log('base58 pub key: ' + base58encoded);
console.log('base58 pub key len: ' + base58encoded.length);
console.log('actual key: edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE');
console.log('actual key len: ' + 'edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE'.length);

It prints:

ed25519 pub key bytes len: 32
base58 pub key: 6jRoreKb7RXAQZBuKZs7WDzsFHHrg62GkMmkXuiWqtKm
base58 pub key len: 44
actual key: edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE
actual key len: 54

A base58 string that I got is 10 characters shorter than an actual Tezos public key. This, and also that topic suggests I need to prefix my ed25519 data with some magical bytes before encoding it with base58. What are those magical bytes? Is there a documentation about that?

Thanks.

EDIT after Arthur B's answer:

I tried appending prefix bytes: \013\015\037\217 to ed25519 bytes before base58 encoding them. Still, I got 49 characters when a real Tezos public key has 54 characters. After appending additional 4 random bytes, I got desired 54 chars and a value that starts with edpk. Clearly this means that prefix is correct - but where do I get remaining 4 bytes from?

EDIT after discussion in comments:

4 bytes were missing due to me using base58 instead of base58check that has additional 4 bytes as a checksum. After using base58check I got 55 bytes starting with 1edpk - so something looking like a valid public Tezos address prepended with a 1 .

Current problem is: when working with the key (specifically - computing its hash) I removed a leading 1 and got 54 characters. As a result, a library I'm using to hash a key threw an Invalid checksum error. Clearly, 1 is a part of base58check checksum. Still, if not removed the key is going to have an invalid prefix. An updated code sample looks like this:

const realKey = 'edpktx799pgw7M4z8551URER52VcENNCSZwE9f9cst4v6h5vCrQmJE';
const seed = crypto.randomBytes(32);
const keyPair = ed25519.MakeKeypair(seed);
const directPubKeyBytes = keyPair.publicKey;

const tezosPublicKeyPrefix = Buffer.from([13, 15, 37, 217]);
const prefixedPublicKey = Buffer.concat([tezosPublicKeyPrefix, directPubKeyBytes]);
const base58checkEncoded = base58check.encode(prefixedPublicKey).substr(1);

console.log('ed25519 pub key bytes len: ' + prefixedPublicKey.length);
console.log('base58 pub key: ' + base58checkEncoded);
console.log('base58 pub key len: ' + base58checkEncoded.length);
console.log('actual key len: ' + realKey.length);

const publicKey = new Key({ key: base58checkEncoded });
await publicKey.ready;
return publicKey.publicKeyHash();

It prints:

ed25519 pub key bytes len: 36
base58 pub key: edpkvCRxvpVG6FYAevL5Kqf4cQhaVAdyovGqrSCezHhNnav5BwjhuZ
base58 pub key len: 54
actual key len: 54
(node:12395) UnhandledPromiseRejectionWarning: Error: Invalid checksum
    at Object.decode (/home/kspisacki/coding/wallets/node_modules/bs58check/base.js:41:25)
    at Object.b58cdecode (/home/kspisacki/coding/wallets/node_modules/sotez/dist/node/index.js:1:12743)
    at z.<anonymous> (/home/kspisacki/coding/wallets/node_modules/sotez/dist/node/index.js:1:15122)
    at Generator.next (<anonymous>)
    at o (/home/kspisacki/coding/wallets/node_modules/sotez/dist/node/index.js:1:13324)

Any further help with that would be greatly appreciated as I don't understand how to get this to work despite reading up A LOT on the topic ;)