TinySecp256k1 --> custom prefix support added.

Author: JasminDreasond

package.json

@@ -40,6 +40,10 @@
   "keywords": [
     "encryption",
     "decryption",
+    "secp256k1",
+    "bech32",
+    "bs58check",
+    "keccak256",
     "aes",
     "rsa",
     "x.509",

src/TinyChain/Secp256k1/Btc.mjs

@@ -11,16 +11,18 @@ class TinyBtcSecp256k1 extends TinySecp256k1 {
    * Creates an instance of TinyBtcSecp256k1.
    *
    * @param {Object} [options] - Optional parameters for the instance.
+   * @param {string|null} [options.prefix='bc'] - Crypto prefix used during message verification.
    * @param {string|null} [options.msgPrefix='Bitcoin Signed Message:\n'] - Message prefix used during message signing.
    * @param {string|null} [options.privateKey=null] - String representation of the private key.
    * @param {BufferEncoding} [options.privateKeyEncoding='hex'] - Encoding used for the privateKey string.
    */
   constructor({
+    prefix = 'bc',
     msgPrefix = 'Bitcoin Signed Message:\n',
     privateKey = null,
     privateKeyEncoding = 'hex',
   } = {}) {
-    super({ msgPrefix, privateKey, privateKeyEncoding });
+    super({ prefix, msgPrefix, privateKey, privateKeyEncoding });
   }
 
   /**
@@ -226,7 +228,7 @@ class TinyBtcSecp256k1 extends TinySecp256k1 {
     // Convert for bech32: witness version 0 + program (ripemd160 result)
     const words = bech32.toWords(ripemd160);
     words.unshift(0x00); // witness version
-    return bech32.encode('bc', words); // bc = mainnet
+    return bech32.encode(this.prefix, words); // bc = mainnet
   }
 
   /**

src/TinyChain/Secp256k1/Eth.mjs

@@ -9,16 +9,18 @@ class TinyEthSecp256k1 extends TinySecp256k1 {
    * Creates an instance of TinyEthSecp256k1.
    *
    * @param {Object} [options] - Optional parameters for the instance.
+   * @param {string|null} [options.prefix='0x'] - Crypto prefix used during message verification.
    * @param {string|null} [options.msgPrefix='\x19Ethereum Signed Message:\n'] - Message prefix used during message signing.
    * @param {string|null} [options.privateKey=null] - String representation of the private key.
    * @param {BufferEncoding} [options.privateKeyEncoding='hex'] - Encoding used for the privateKey string.
    */
   constructor({
+    prefix = '0x',
     msgPrefix = '\x19Ethereum Signed Message:\n',
     privateKey = null,
     privateKeyEncoding = 'hex',
   } = {}) {
-    super({ msgPrefix, privateKey, privateKeyEncoding });
+    super({ prefix, msgPrefix, privateKey, privateKeyEncoding });
   }
 
   /**
@@ -84,14 +86,14 @@ class TinyEthSecp256k1 extends TinySecp256k1 {
   }
 
   /**
-  * Apply EIP-55 checksum to a lowercase address.
-  * @param {string} address - Hex string without 0x prefix.
-  * @returns {string}
-    */
+   * Apply EIP-55 checksum to a lowercase address.
+   * @param {string} address - Hex string without 0x prefix.
+   * @returns {string}
+   */
   #toChecksumAddress(address) {
     const { keccak256 } = this.getJsSha3();
     const hash = keccak256(address.toLowerCase());
-    let checksumAddress = '0x';
+    let checksumAddress = this.prefix;
     for (let i = 0; i < address.length; i++) {
       const char = address[i];
       const hashChar = parseInt(hash[i], 16);

src/TinyChain/Secp256k1/index.mjs

@@ -43,6 +43,7 @@ class TinySecp256k1 {
   /** @typedef {import('elliptic').ec} ec */
   /** @typedef {import('elliptic').ec.KeyPair} KeyPair */
   msgPrefix = 'Tinychain Signed Message:\n';
+  prefix = '';
 
   /**
    * Computes SHA-256 hash of the input buffer.
@@ -78,12 +79,19 @@ class TinySecp256k1 {
    * Creates an instance of TinySecp256k1.
    *
    * @param {Object} [options] - Optional parameters for the instance.
+   * @param {string|null} [options.prefix=null] - Crypto prefix used during message verification.
    * @param {string|null} [options.msgPrefix=null] - Message prefix used during message signing.
    * @param {string|null} [options.privateKey=null] - String representation of the private key.
    * @param {BufferEncoding} [options.privateKeyEncoding='hex'] - Encoding used for the privateKey string.
    */
-  constructor({ msgPrefix = null, privateKey = null, privateKeyEncoding = 'hex' } = {}) {
+  constructor({
+    prefix = null,
+    msgPrefix = null,
+    privateKey = null,
+    privateKeyEncoding = 'hex',
+  } = {}) {
     if (typeof msgPrefix === 'string') this.msgPrefix = msgPrefix;
+    if (typeof prefix === 'string') this.prefix = prefix;
     this.privateKey = privateKey ? Buffer.from(privateKey, privateKeyEncoding) : randomBytes(32);
   }
 
@@ -197,7 +205,7 @@ class TinySecp256k1 {
    * @returns {string} The public address.
    */
   getAddress(type = '', compressed = true) {
-    return this.getPublicKeyHex(compressed);
+    return `${this.prefix}${this.getPublicKeyHex(compressed)}`;
   }
 
   /**

test/TinyChain.mjs

@@ -170,21 +170,21 @@ const tinySignatureTest = async () => {
 };
 
 const tinyBtcSignatureTest = async () => {
-  console.log('\n🔐🔹 TinySecp256k1 Signature Test 🔹🔐\n');
+  console.log('\n🔐🔹 TinySecp256k1 BTC Signature Test 🔹🔐\n');
 
   const signer = new TinyChain.Btc256k1();
   await signer.init();
 
   const privateKey = signer.getPrivateKeyHex();
   const publicKey = signer.getAddress();
 
-  console.log('🗝️  Keys');
+  console.log('🗝️  Keys (BTC)');
   console.log('──────────────────────────────');
   console.log(`🔒 Private Key : ${privateKey}`);
   console.log(`🔓 Public Key  : ${publicKey}\n`);
 
   const recoverableMessage = 'Hello world';
-  console.log('♻️  Signing message');
+  console.log('♻️  Signing message (BTC)');
   console.log('──────────────────────────────');
   const sig = signer.signMessage(recoverableMessage);
   console.log(`📄 Signature (Recoverable): ${sig.toString('hex')}`);
@@ -195,25 +195,25 @@ const tinyBtcSignatureTest = async () => {
   console.log(`🔍 Message Signature Valid? ${isValid}\n`);
   console.log(`📄 Message Signature (Recoverable): ${recoveredPubKey}`);
 
-  console.log('✅ Test Completed!\n');
+  console.log('✅ Test Completed! (BTC)\n');
 };
 
 const testTinyEthSecp256k1 = async () => {
-  console.log('\n🔐🔹 TinySecp256k1 Signature Test 🔹🔐\n');
+  console.log('\n🔐🔹 TinySecp256k1 ETH Signature Test 🔹🔐\n');
 
   const signer = new TinyChain.Eth256k1();
   await signer.init();
 
   const privateKey = signer.getPrivateKeyHex();
   const publicKey = signer.getAddress();
 
-  console.log('🗝️  Keys');
+  console.log('🗝️  Keys (ETH)');
   console.log('──────────────────────────────');
   console.log(`🔒 Private Key : ${privateKey}`);
   console.log(`🔓 Public Key  : ${publicKey}\n`);
 
   const recoverableMessage = 'Hello world';
-  console.log('♻️  Signing message');
+  console.log('♻️  Signing message (ETH)');
   console.log('──────────────────────────────');
   const sig = signer.signMessage(recoverableMessage);
   console.log(`📄 Signature (Recoverable): ${sig.toString('hex')}`);
@@ -224,7 +224,7 @@ const testTinyEthSecp256k1 = async () => {
   console.log(`🔍 Message Signature Valid? ${isValid}\n`);
   console.log(`📄 Message Signature (Recoverable): ${recoveredPubKey}`);
 
-  console.log('✅ Test Completed!\n');
+  console.log('✅ Test Completed! (ETH)\n');
 };
 
 const tinyChainSimulation = async () => {