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Dismiss alert {{ message }} [ bitsofproof ](https://github.com/bitsofproof) / **[supernode](https://github.com/bitsofproof/supernode) ** Public * [ Notifications ](https://github.com/login?return_to=%2Fbitsofproof%2Fsupernode) You must be signed in to change notification settings * [ Fork 59 ](https://github.com/login?return_to=%2Fbitsofproof%2Fsupernode) * [ Star 129 ](https://github.com/login?return_to=%2Fbitsofproof%2Fsupernode) * [ Code ](https://github.com/bitsofproof/supernode/tree/1.1) * [ Issues 1 ](https://github.com/bitsofproof/supernode/issues) * [ Pull requests 1 ](https://github.com/bitsofproof/supernode/pulls) * [ Actions ](https://github.com/bitsofproof/supernode/actions) * [ Projects ](https://github.com/bitsofproof/supernode/projects) * [ Security and quality 0 ](https://github.com/bitsofproof/supernode/security) * [ Insights ](https://github.com/bitsofproof/supernode/pulse) Additional navigation options * [ Code ](https://github.com/bitsofproof/supernode/tree/1.1) * [ Issues ](https://github.com/bitsofproof/supernode/issues) * [ Pull requests ](https://github.com/bitsofproof/supernode/pulls) * [ Actions ](https://github.com/bitsofproof/supernode/actions) * [ Projects ](https://github.com/bitsofproof/supernode/projects) * [ Security and quality ](https://github.com/bitsofproof/supernode/security) * [ Insights ](https://github.com/bitsofproof/supernode/pulse) [](https://github.com/bitsofproof/supernode) ## Collapse file tree ## Files File does not exist on default branch 1.1 Search this repository(forward slash)` forward slash/` * api * src * main * java/com/bitsofproof/supernode * api * AccountListener.java * AccountManager.java * AddressConverter.java * AddressListAccountManager.java * AlertListener.java * BCSAPI.java * BCSAPIException.java * BaseAccountManager.java * Block.java * Color.java * ColorRules.java * ExtendedKey.java * ExtendedKeyAccountManager.java * ExtendedKeySetWallet.java * FileWallet.java * InMemoryUTXO.java * JMSServerConnector.java * KeyFormatter.java * KeyListAccountManager.java * ServerConnector.java * Transaction.java * TransactionInput.java * TransactionListener.java * TransactionOutput.java * TrunkListener.java * TrunkUpdateMessage.java * Wallet.java * common * proto * test * .gitignore * generateBCSAPIkeys * pom.xml * server * .gitignore * .travis.yml * LICENSE * NOTICE * README.md * pom.xml ## Breadcrumbs 1. [supernode](https://github.com/bitsofproof/supernode/tree/1.1) 2. /[api](https://github.com/bitsofproof/supernode/tree/1.1/api) 3. /[src](https://github.com/bitsofproof/supernode/tree/1.1/api/src) 4. /[main](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main) 5. /[java](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java) 6. /[com](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java/com) 7. /[bitsofproof](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java/com/bitsofproof) 8. /[supernode](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java/com/bitsofproof/supernode) 9. /[api](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java/com/bitsofproof/supernode/api) / # ExtendedKey.java Copy path Blame More file actions Blame More file actions ## Latest commit [![tamasblummer](https://avatars.githubusercontent.com/u/4289351?v=4&size=40)](https://github.com/tamasblummer)[tamasblummer](https://github.com/bitsofproof/supernode/commits?author=tamasblummer) [file wallet can now store encryped master in place of seed.](https://github.com/bitsofproof/supernode/commit/1c3b7fc426c38e07a70eb156b7c4898cdaedded1) Aug 8, 2013 [1c3b7fc](https://github.com/bitsofproof/supernode/commit/1c3b7fc426c38e07a70eb156b7c4898cdaedded1) · Aug 8, 2013 ## History [History](https://github.com/bitsofproof/supernode/commits/1.1/api/src/main/java/com/bitsofproof/supernode/api/ExtendedKey.java) Open commit details [](https://github.com/bitsofproof/supernode/commits/1.1/api/src/main/java/com/bitsofproof/supernode/api/ExtendedKey.java)History 438 lines (406 loc) · 12.2 KB ## Breadcrumbs 1. [supernode](https://github.com/bitsofproof/supernode/tree/1.1) 2. /[api](https://github.com/bitsofproof/supernode/tree/1.1/api) 3. /[src](https://github.com/bitsofproof/supernode/tree/1.1/api/src) 4. /[main](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main) 5. /[java](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java) 6. /[com](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java/com) 7. /[bitsofproof](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java/com/bitsofproof) 8. /[supernode](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java/com/bitsofproof/supernode) 9. /[api](https://github.com/bitsofproof/supernode/tree/1.1/api/src/main/java/com/bitsofproof/supernode/api) / # ExtendedKey.java Top ## File metadata and controls * Code * Blame 438 lines (406 loc) · 12.2 KB [Raw](https://github.com/bitsofproof/supernode/raw/refs/heads/1.1/api/src/main/java/com/bitsofproof/supernode/api/ExtendedKey.java) Copy raw file Download raw file You must be signed in to make or propose changes More edit options Open symbols panel Edit and raw actions /* * Copyright 2013 bits of proof zrt. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.bitsofproof.supernode.api; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.math.BigInteger; import java.security.InvalidAlgorithmParameterException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.SecureRandom; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.Mac; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import org.bouncycastle.asn1.sec.SECNamedCurves; import org.bouncycastle.asn1.x9.X9ECParameters; import org.bouncycastle.crypto.generators.SCrypt; import org.bouncycastle.math.ec.ECPoint; import org.bouncycastle.util.Arrays; import com.bitsofproof.supernode.common.ByteUtils; import com.bitsofproof.supernode.common.ECKeyPair; import com.bitsofproof.supernode.common.ECPublicKey; import com.bitsofproof.supernode.common.Key; import com.bitsofproof.supernode.common.ValidationException; /** * Key Generator following BIP32 https://en.bitcoin.it/wiki/BIP_0032 */ public class ExtendedKey { private static final SecureRandom rnd = new SecureRandom (); private static final X9ECParameters curve = SECNamedCurves.getByName ("secp256k1"); private final Key master; private final byte[] chainCode; private final int depth; private final int parent; private final int sequence; private static final byte[] BITCOIN_SEED = "Bitcoin seed".getBytes (); public static ExtendedKey createFromPassphrase (String passphrase, byte[] encrypted) throws ValidationException { try { byte[] key = SCrypt.generate (passphrase.getBytes ("UTF-8"), BITCOIN_SEED, 16384, 8, 8, 32); SecretKeySpec keyspec = new SecretKeySpec (key, "AES"); if ( encrypted.length == 32 ) { // asssume encrypted is seed Cipher cipher = Cipher.getInstance ("AES/ECB/NoPadding", "BC"); cipher.init (Cipher.DECRYPT_MODE, keyspec); return create (cipher.doFinal (encrypted)); } else { // assume encrypted serialization of a key Cipher cipher = Cipher.getInstance ("AES/CBC/PKCS5Padding", "BC"); byte[] iv = Arrays.copyOfRange (encrypted, 0, 16); byte[] data = Arrays.copyOfRange (encrypted, 16, encrypted.length); cipher.init (Cipher.DECRYPT_MODE, keyspec, new IvParameterSpec (iv)); return ExtendedKey.parse (new String (cipher.doFinal (data))); } } catch ( UnsupportedEncodingException e ) { throw new ValidationException (e); } catch ( IllegalBlockSizeException e ) { throw new ValidationException (e); } catch ( BadPaddingException e ) { throw new ValidationException (e); } catch ( InvalidKeyException e ) { throw new ValidationException (e); } catch ( NoSuchAlgorithmException e ) { throw new ValidationException (e); } catch ( NoSuchProviderException e ) { throw new ValidationException (e); } catch ( NoSuchPaddingException e ) { throw new ValidationException (e); } catch ( InvalidAlgorithmParameterException e ) { throw new ValidationException (e); } } public byte[] encrypt (String passphrase, boolean production) throws ValidationException { try { byte[] key = SCrypt.generate (passphrase.getBytes ("UTF-8"), BITCOIN_SEED, 16384, 8, 8, 32); SecretKeySpec keyspec = new SecretKeySpec (key, "AES"); Cipher cipher = Cipher.getInstance ("AES/CBC/PKCS5Padding", "BC"); cipher.init (Cipher.ENCRYPT_MODE, keyspec); byte[] iv = cipher.getIV (); byte[] c = cipher.doFinal (serialize (production).getBytes ()); byte[] result = new byte[iv.length + c.length]; System.arraycopy (iv, 0, result, 0, iv.length); System.arraycopy (c, 0, result, iv.length, c.length); return result; } catch ( UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchProviderException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException e ) { throw new ValidationException (e); } } public static ExtendedKey create (byte[] seed) throws ValidationException { try { Mac mac = Mac.getInstance ("HmacSHA512", "BC"); SecretKey seedkey = new SecretKeySpec (BITCOIN_SEED, "HmacSHA512"); mac.init (seedkey); byte[] lr = mac.doFinal (seed); byte[] l = Arrays.copyOfRange (lr, 0, 32); byte[] r = Arrays.copyOfRange (lr, 32, 64); BigInteger m = new BigInteger (1, l); if ( m.compareTo (curve.getN ()) >= 0 ) { throw new ValidationException ("This is rather unlikely, but it did just happen"); } ECKeyPair keyPair = new ECKeyPair (l, true); return new ExtendedKey (keyPair, r, 0, 0, 0); } catch ( NoSuchAlgorithmException e ) { throw new ValidationException (e); } catch ( NoSuchProviderException e ) { throw new ValidationException (e); } catch ( InvalidKeyException e ) { throw new ValidationException (e); } } public static ExtendedKey createNew () { Key key = ECKeyPair.createNew (true); byte[] chainCode = new byte[32]; rnd.nextBytes (chainCode); return new ExtendedKey (key, chainCode, 0, 0, 0); } public ExtendedKey (Key key, byte[] chainCode, int depth, int parent, int sequence) { this.master = key; this.chainCode = chainCode; this.parent = parent; this.depth = depth; this.sequence = sequence; } public Key getMaster () { return master; } public byte[] getChainCode () { return Arrays.clone (chainCode); } public int getDepth () { return depth; } public int getParent () { return parent; } public int getSequence () { return sequence; } public int getFingerPrint () { int fingerprint = 0; byte[] address = master.getAddress (); for ( int i = 0; i < 4; ++i ) { fingerprint <<= 8; fingerprint |= address[i] & 0xff; } return fingerprint; } public Key getKey (int sequence) throws ValidationException { return generateKey (sequence).getMaster (); } public ExtendedKey getChild (int sequence) throws ValidationException { ExtendedKey sub = generateKey (sequence); return new ExtendedKey (sub.getMaster (), sub.getChainCode (), sub.getDepth () + 1, getFingerPrint (), sequence); } public ExtendedKey getReadOnly () { return new ExtendedKey (new ECPublicKey (master.getPublic (), true), chainCode, depth, parent, sequence); } public boolean isReadOnly () { return master.getPrivate () == null; } private ExtendedKey generateKey (int sequence) throws ValidationException { try { if ( (sequence & 0x80000000) != 0 && master.getPrivate () == null ) { throw new ValidationException ("need private key for private generation"); } Mac mac = Mac.getInstance ("HmacSHA512", "BC"); SecretKey key = new SecretKeySpec (chainCode, "HmacSHA512"); mac.init (key); byte[] extended; byte[] pub = master.getPublic (); if ( (sequence & 0x80000000) == 0 ) { extended = new byte[pub.length + 4]; System.arraycopy (pub, 0, extended, 0, pub.length); extended[pub.length] = (byte) ((sequence >>> 24) & 0xff); extended[pub.length + 1] = (byte) ((sequence >>> 16) & 0xff); extended[pub.length + 2] = (byte) ((sequence >>> 8) & 0xff); extended[pub.length + 3] = (byte) (sequence & 0xff); } else { byte[] priv = master.getPrivate (); extended = new byte[priv.length + 5]; System.arraycopy (priv, 0, extended, 1, priv.length); extended[priv.length + 1] = (byte) ((sequence >>> 24) & 0xff); extended[priv.length + 2] = (byte) ((sequence >>> 16) & 0xff); extended[priv.length + 3] = (byte) ((sequence >>> 8) & 0xff); extended[priv.length + 4] = (byte) (sequence & 0xff); } byte[] lr = mac.doFinal (extended); byte[] l = Arrays.copyOfRange (lr, 0, 32); byte[] r = Arrays.copyOfRange (lr, 32, 64); BigInteger m = new BigInteger (1, l); if ( m.compareTo (curve.getN ()) >= 0 ) { throw new ValidationException ("This is rather unlikely, but it did just happen"); } if ( master.getPrivate () != null ) { BigInteger k = m.add (new BigInteger (1, master.getPrivate ())).mod (curve.getN ()); if ( k.equals (BigInteger.ZERO) ) { throw new ValidationException ("This is rather unlikely, but it did just happen"); } return new ExtendedKey (new ECKeyPair (k, true), r, depth, parent, sequence); } else { ECPoint q = curve.getG ().multiply (m).add (curve.getCurve ().decodePoint (pub)); if ( q.isInfinity () ) { throw new ValidationException ("This is rather unlikely, but it did just happen"); } pub = new ECPoint.Fp (curve.getCurve (), q.getX (), q.getY (), true).getEncoded (); return new ExtendedKey (new ECPublicKey (pub, true), r, depth, parent, sequence); } } catch ( NoSuchAlgorithmException e ) { throw new ValidationException (e); } catch ( NoSuchProviderException e ) { throw new ValidationException (e); } catch ( InvalidKeyException e ) { throw new ValidationException (e); } } private static final byte[] xprv = new byte[] { 0x04, (byte) 0x88, (byte) 0xAD, (byte) 0xE4 }; private static final byte[] xpub = new byte[] { 0x04, (byte) 0x88, (byte) 0xB2, (byte) 0x1E }; private static final byte[] tprv = new byte[] { 0x04, (byte) 0x35, (byte) 0x83, (byte) 0x94 }; private static final byte[] tpub = new byte[] { 0x04, (byte) 0x35, (byte) 0x87, (byte) 0xCF }; public String serialize (boolean production) { ByteArrayOutputStream out = new ByteArrayOutputStream (); try { if ( master.getPrivate () != null ) { if ( production ) { out.write (xprv); } else { out.write (tprv); } } else { if ( production ) { out.write (xpub); } else { out.write (tpub); } } out.write (depth & 0xff); out.write ((parent >>> 24) & 0xff); out.write ((parent >>> 16) & 0xff); out.write ((parent >>> 8) & 0xff); out.write (parent & 0xff); out.write ((sequence >>> 24) & 0xff); out.write ((sequence >>> 16) & 0xff); out.write ((sequence >>> 8) & 0xff); out.write (sequence & 0xff); out.write (chainCode); if ( master.getPrivate () != null ) { out.write (0x00); out.write (master.getPrivate ()); } else { out.write (master.getPublic ()); } } catch ( IOException e ) { } return ByteUtils.toBase58WithChecksum (out.toByteArray ()); } public static ExtendedKey parse (String serialized) throws ValidationException { byte[] data = ByteUtils.fromBase58WithChecksum (serialized); if ( data.length != 78 ) { throw new ValidationException ("invalid extended key"); } byte[] type = Arrays.copyOf (data, 4); boolean hasPrivate; if ( Arrays.areEqual (type, xprv) || Arrays.areEqual (type, tprv) ) { hasPrivate = true; } else if ( Arrays.areEqual (type, xpub) || Arrays.areEqual (type, tpub) ) { hasPrivate = false; } else { throw new ValidationException ("invalid magic number for an extended key"); } int depth = data[4] & 0xff; int parent = data[5] & 0xff; parent <<= 8; parent |= data[6] & 0xff; parent <<= 8; parent |= data[7] & 0xff; parent <<= 8; parent |= data[8] & 0xff; int sequence = data[9] & 0xff; sequence <<= 8; sequence |= data[10] & 0xff; sequence <<= 8; sequence |= data[11] & 0xff; sequence <<= 8; sequence |= data[12] & 0xff; byte[] chainCode = Arrays.copyOfRange (data, 13, 13 + 32); byte[] pubOrPriv = Arrays.copyOfRange (data, 13 + 32, data.length); Key key; if ( hasPrivate ) { key = new ECKeyPair (new BigInteger (1, pubOrPriv), true); } else { key = new ECPublicKey (pubOrPriv, true); } return new ExtendedKey (key, chainCode, depth, parent, sequence); } } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 ## Footer [ ](https://github.com) © 2026 GitHub, Inc. ### Footer navigation * [Terms](https://docs.github.com/site-policy/github-terms/github-terms-of-service) * [Privacy](https://docs.github.com/site-policy/privacy-policies/github-privacy-statement) * [Security](https://github.com/security) * [Status](https://www.githubstatus.com/) * [Community](https://github.community/) * [Docs](https://docs.github.com/) * [Contact](https://support.github.com?tags=dotcom-footer) * Manage cookies * Do not share my personal information You can’t perform that action at this time. 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