feat: add NIP-49 ncryptsec support, upgrade to nostr-crypto-utils v0.5.1

Add toNcryptsec() and fromNcryptsec() for password-protected private
key export/import using the NIP-49 ncryptsec bech32 format. Natural
companion to BIP-39 seedphrase key derivation — users can now encrypt
their derived keys for secure backup. Sensitive byte arrays are zeroed
after use, consistent with existing codebase patterns.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vveerrgg

dist/__mocks__/@noble/secp256k1.js

@@ -1,11 +1,11 @@
 // Mock implementation of @noble/secp256k1 for testing
-import { bytesToHex as originalBytesToHex, hexToBytes as originalHexToBytes } from "@noble/hashes/utils";
+import { bytesToHex as originalBytesToHex, hexToBytes as originalHexToBytes, } from "@noble/hashes/utils";
 function ensureUint8Array(input) {
     if (input instanceof Uint8Array)
         return input;
-    if (typeof input === 'string')
+    if (typeof input === "string")
         return originalHexToBytes(input);
-    throw new Error('Input must be Uint8Array or hex string');
+    throw new Error("Input must be Uint8Array or hex string");
 }
 function createMockPublicKey(privateKey) {
     // Create a deterministic 33-byte compressed public key
@@ -21,7 +21,7 @@ function createMockPublicKey(privateKey) {
 export function getPublicKey(privateKey) {
     const privKeyBytes = ensureUint8Array(privateKey);
     if (privKeyBytes.length !== 32) {
-        throw new Error('Private key must be 32 bytes');
+        throw new Error("Private key must be 32 bytes");
     }
     return createMockPublicKey(privKeyBytes);
 }
@@ -40,7 +40,7 @@ export const schnorr = {
     },
     verify(signature, message, publicKey) {
         return Promise.resolve(true);
-    }
+    },
 };
 // Mock utility functions
 export const utils = {
@@ -61,10 +61,10 @@ export const utils = {
             privateKey[i] = Math.floor(Math.random() * 256);
         }
         return privateKey;
-    }
+    },
 };
 export default {
     getPublicKey,
     schnorr,
-    utils
+    utils,
 };

dist/__mocks__/bech32.js

@@ -24,19 +24,19 @@ function encode(prefix, words, limit) {
 }
 function decode(str, limit) {
     // Simple mock decoding: split on '1'
-    const [prefix, data] = str.split('1');
+    const [prefix, data] = str.split("1");
     if (!prefix || !data) {
-        throw new Error('Invalid bech32 string');
+        throw new Error("Invalid bech32 string");
     }
     const bytes = hexToBytes(data);
     return {
         prefix,
-        words: Array.from(bytes).map(b => b & 0x1f) // Convert to 5-bit words
+        words: Array.from(bytes).map((b) => b & 0x1f), // Convert to 5-bit words
     };
 }
 export const bech32 = {
     toWords,
     fromWords,
     encode,
-    decode
+    decode,
 };

dist/__mocks__/bip39.js

@@ -13,7 +13,7 @@ export function validateMnemonic(mnemonic) {
         return true;
     }
     const words = mnemonic.split(" ");
-    const isValid = words.length === 12 && words.every(word => word.length > 0);
+    const isValid = words.length === 12 && words.every((word) => word.length > 0);
     console.log(`Validation result for "${mnemonic}": ${isValid}`);
     return isValid;
 }

dist/bips/bip39.js

@@ -1,5 +1,5 @@
-import { generateMnemonic, validateMnemonic, mnemonicToEntropy } from 'bip39';
-import { logger } from '../utils/logger';
+import { generateMnemonic, validateMnemonic, mnemonicToEntropy } from "bip39";
+import { logger } from "../utils/logger";
 /**
  * Generates a new BIP39 seed phrase
  * @returns {string} The generated seed phrase
@@ -12,8 +12,8 @@ export function generateSeedPhrase() {
         return generateMnemonic();
     }
     catch (error) {
-        logger.error('Failed to generate seed phrase:', error instanceof Error ? error.message : String(error));
-        throw new Error('Failed to generate seed phrase');
+        logger.error("Failed to generate seed phrase:", error instanceof Error ? error.message : String(error));
+        throw new Error("Failed to generate seed phrase");
     }
 }
 /**
@@ -29,7 +29,7 @@ export function validateSeedPhrase(seedPhrase) {
         return validateMnemonic(seedPhrase);
     }
     catch (error) {
-        logger.error('Failed to validate seed phrase:', error instanceof Error ? error.message : String(error));
+        logger.error("Failed to validate seed phrase:", error instanceof Error ? error.message : String(error));
         return false;
     }
 }
@@ -45,7 +45,7 @@ export function validateSeedPhrase(seedPhrase) {
 export function getEntropyFromSeedPhrase(seedPhrase) {
     try {
         if (!validateSeedPhrase(seedPhrase)) {
-            throw new Error('Invalid seed phrase');
+            throw new Error("Invalid seed phrase");
         }
         // Convert the seed phrase to entropy bytes
         const entropyHex = mnemonicToEntropy(seedPhrase);
@@ -57,7 +57,7 @@ export function getEntropyFromSeedPhrase(seedPhrase) {
         return entropyBytes;
     }
     catch (error) {
-        logger.error('Failed to get entropy from seed phrase:', error instanceof Error ? error.message : String(error));
-        throw new Error('Failed to get entropy from seed phrase');
+        logger.error("Failed to get entropy from seed phrase:", error instanceof Error ? error.message : String(error));
+        throw new Error("Failed to get entropy from seed phrase");
     }
 }

dist/bips/index.d.ts

@@ -2,4 +2,4 @@
  * @module bips
  * @description Bitcoin Improvement Proposals (BIPs) implementations
  */
-export * from './bip39.js';
+export * from "./bip39.js";

dist/bips/index.js

@@ -2,4 +2,4 @@
  * @module bips
  * @description Bitcoin Improvement Proposals (BIPs) implementations
  */
-export * from './bip39.js';
+export * from "./bip39.js";

dist/browser.d.ts

@@ -1 +1 @@
-export * from './index';
+export * from "./index";

dist/browser.js

@@ -1,13 +1,13 @@
 // Re-export everything from index
-export * from './index';
+export * from "./index";
 // Add browser-specific implementations or overrides here
-import { Buffer } from 'buffer';
-if (typeof window !== 'undefined') {
+import { Buffer } from "buffer";
+if (typeof window !== "undefined") {
     window.Buffer = Buffer;
 }
 // Add any browser-specific initialization code here
-const isBrowser = typeof window !== 'undefined';
+const isBrowser = typeof window !== "undefined";
 if (isBrowser) {
     // Initialize any browser-specific features
-    console.log('NostrNsecSeedphrase loaded in browser environment');
+    console.log("NostrNsecSeedphrase loaded in browser environment");
 }

dist/browser/nostr-nsec-seedphrase.min.js

@@ -7,6 +7,12 @@
 
 /*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
 
+/*! noble-ciphers - MIT License (c) 2023 Paul Miller (paulmillr.com) */
+
+/*! noble-curves - MIT License (c) 2022 Paul Miller (paulmillr.com) */
+
 /*! noble-hashes - MIT License (c) 2022 Paul Miller (paulmillr.com) */
 
 /*! noble-secp256k1 - MIT License (c) 2019 Paul Miller (paulmillr.com) */
+
+/*! scure-base - MIT License (c) 2022 Paul Miller (paulmillr.com) */