Generates a DID identifier using the owner's public key, method, and program ID.

sol-did.js

/**
 * Generates a DID identifier using the owner's public key, method, and program ID.
 * @param {string} authorityPublicKey - The owner's public key.
 * @returns {string} - The generated DID identifier.
 * https://g.identity.com/sol-did/#identifier-generation-method
 */
import bs58 from 'bs58';

async function generateDIDIdentifier(authorityPublicKey) {
  let seed = 256;
  let hashedData;
  const didMethod = 'sol';
  const programID = 'didso1Dpqpm4CsiCjzP766BGY89CAdD6ZBL68cRhFPc';

  while (true) {
    seed -= 1;
    let dataToHash = authorityPublicKey + didMethod + seed + programID;
    let ArrayBufferData = new TextEncoder().encode(dataToHash);
    const buffer = await crypto.subtle.digest('SHA-256', ArrayBufferData);
    hashedData = new Uint8Array(buffer);    
    if ((hashedData[0] & 0xF8) == 0) {
      break;
    }
  }

  if (!hashedData) {
    throw new Error('Failed to generate hashed data');
  }

  return bs58.encode(Buffer.from(hashedData));
}

// -- Testing 

const didRegex = /^[1-9A-HJ-NP-Za-km-z]{40,48}$/;
const isValidDID = didRegex.test(didIdentifier);

console.log('Is valid DID:', isValidDID);