electrum seed version system support

src/main/java/com/sparrowwallet/drongo/Utils.java

@@ -1,6 +1,9 @@
 package com.sparrowwallet.drongo;
 
+import com.sparrowwallet.drongo.crypto.AESKeyCrypter;
 import com.sparrowwallet.drongo.crypto.ChildNumber;
+import com.sparrowwallet.drongo.crypto.EncryptedData;
+import com.sparrowwallet.drongo.crypto.KeyCrypter;
 import com.sparrowwallet.drongo.protocol.ProtocolException;
 import com.sparrowwallet.drongo.protocol.Ripemd160;
 import com.sparrowwallet.drongo.protocol.Sha256Hash;
@@ -13,10 +16,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.math.BigInteger;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import java.util.StringJoiner;
+import java.util.*;
 
 public class Utils {
     public static final int MAX_INITIAL_ARRAY_LENGTH = 20;
@@ -248,6 +248,20 @@ public class Utils {
         return Ripemd160.getHash(sha256);
     }
 
+    /**
+     * Calculates RIPEMD160(SHA256(input)). This is used in Address calculations.
+     */
+    public static byte[] sha256sha256(byte[] input) {
+        byte[] sha256 = Sha256Hash.hash(input);
+        return Sha256Hash.hash(sha256);
+    }
+
+    public static byte[] decryptAesCbcPkcs7(byte[] initializationVector, byte[] encryptedBytes, byte[] keyBytes) {
+        KeyCrypter keyCrypter = new AESKeyCrypter();
+        EncryptedData data = new EncryptedData(initializationVector, encryptedBytes);
+        return keyCrypter.decrypt(data, new KeyParameter(keyBytes));
+    }
+
     /** Convert to a string path, starting with "M/" */
     public static String formatHDPath(List<ChildNumber> path) {
         StringJoiner joiner = new StringJoiner("/");

src/main/java/com/sparrowwallet/drongo/wallet/DeterministicSeed.java

@@ -15,6 +15,8 @@ public class DeterministicSeed implements EncryptableItem {
     public static final int DEFAULT_SEED_ENTROPY_BITS = 128;
     public static final int MAX_SEED_ENTROPY_BITS = 512;
 
+    private final Type type;
+
     private final byte[] seed;
     private final List<String> mnemonicCode;
 
@@ -23,40 +25,45 @@ public class DeterministicSeed implements EncryptableItem {
 
     private long creationTimeSeconds;
 
-    public DeterministicSeed(String mnemonicString, byte[] seed, String passphrase, long creationTimeSeconds) {
-        this(decodeMnemonicCode(mnemonicString), seed, passphrase, creationTimeSeconds);
+    //Session only storage
+    private transient String passphrase;
+
+    public DeterministicSeed(String mnemonicString, byte[] seed, String passphrase, long creationTimeSeconds, Type type) {
+        this(decodeMnemonicCode(mnemonicString), seed, passphrase, creationTimeSeconds, type);
     }
 
-    public DeterministicSeed(byte[] seed, List<String> mnemonic, long creationTimeSeconds) {
+    public DeterministicSeed(byte[] seed, List<String> mnemonic, long creationTimeSeconds, Type type) {
         this.seed = seed;
         this.encryptedSeed = null;
         this.mnemonicCode = mnemonic;
         this.encryptedMnemonicCode = null;
         this.creationTimeSeconds = creationTimeSeconds;
+        this.type = type;
     }
 
-    public DeterministicSeed(EncryptedData encryptedMnemonic, EncryptedData encryptedSeed, long creationTimeSeconds) {
+    public DeterministicSeed(EncryptedData encryptedMnemonic, EncryptedData encryptedSeed, long creationTimeSeconds, Type type) {
         this.seed = null;
         this.encryptedSeed = encryptedSeed;
         this.mnemonicCode = null;
         this.encryptedMnemonicCode = encryptedMnemonic;
         this.creationTimeSeconds = creationTimeSeconds;
+        this.type = type;
     }
 
     /**
-     * Constructs a seed from a BIP 39 mnemonic code. See {@link Bip39MnemonicCode} for more
+     * Constructs a seed from a mnemonic code. See {@link Bip39MnemonicCode} or {@link ElectrumMnemonicCode} for more
      * details on this scheme.
      * @param mnemonicCode A list of words.
      * @param seed The derived seed, or pass null to derive it from mnemonicCode (slow)
      * @param passphrase A user supplied passphrase, or an empty string if there is no passphrase
      * @param creationTimeSeconds When the seed was originally created, UNIX time.
      */
-    public DeterministicSeed(List<String> mnemonicCode, byte[] seed, String passphrase, long creationTimeSeconds) {
-        this((seed != null ? seed : Bip39MnemonicCode.toSeed(mnemonicCode, passphrase)), mnemonicCode, creationTimeSeconds);
+    public DeterministicSeed(List<String> mnemonicCode, byte[] seed, String passphrase, long creationTimeSeconds, Type type) {
+        this((seed != null ? seed : type.toSeed(mnemonicCode, passphrase)), mnemonicCode, creationTimeSeconds, type);
     }
 
     /**
-     * Constructs a seed from a BIP 39 mnemonic code. See {@link Bip39MnemonicCode} for more
+     * Constructs a new BIP39 seed. See {@link Bip39MnemonicCode} for more
      * details on this scheme.
      * @param random Entropy source
      * @param bits number of bits, must be divisible by 32
@@ -67,7 +74,7 @@ public class DeterministicSeed implements EncryptableItem {
     }
 
     /**
-     * Constructs a seed from a BIP 39 mnemonic code. See {@link Bip39MnemonicCode} for more
+     * Constructs a BIP39 seed from provided entropy. See {@link Bip39MnemonicCode} for more
      * details on this scheme.
      * @param entropy entropy bits, length must be divisible by 32
      * @param passphrase A user supplied passphrase, or an empty string if there is no passphrase
@@ -96,14 +103,15 @@ public class DeterministicSeed implements EncryptableItem {
         this.encryptedMnemonicCode = null;
         this.encryptedSeed = null;
         this.creationTimeSeconds = creationTimeSeconds;
+        this.type = Type.BIP39;
     }
 
-    public boolean needPassphrase() {
+    public boolean usesPassphrase() {
         if(isEncrypted()) {
             throw new IllegalArgumentException("Cannot determine if passphrase is required in encrypted state");
         }
 
-        byte[] mnemonicOnlySeed = Bip39MnemonicCode.toSeed(mnemonicCode, "");
+        byte[] mnemonicOnlySeed = type.toSeed(mnemonicCode, "");
         return Arrays.equals(mnemonicOnlySeed, seed);
     }
 
@@ -172,6 +180,10 @@ public class DeterministicSeed implements EncryptableItem {
         this.creationTimeSeconds = creationTimeSeconds;
     }
 
+    public Type getType() {
+        return type;
+    }
+
     public DeterministicSeed encrypt(KeyCrypter keyCrypter, KeyParameter aesKey) {
         if(encryptedSeed != null) {
             throw new IllegalArgumentException("Trying to encrypt seed twice");
@@ -181,7 +193,7 @@ public class DeterministicSeed implements EncryptableItem {
         }
         EncryptedData encryptedMnemonic = keyCrypter.encrypt(getMnemonicAsBytes(), null, aesKey);
         EncryptedData encryptedSeed = keyCrypter.encrypt(seed, null, aesKey);
-        return new DeterministicSeed(encryptedMnemonic, encryptedSeed, creationTimeSeconds);
+        return new DeterministicSeed(encryptedMnemonic, encryptedSeed, creationTimeSeconds, type);
     }
 
     private byte[] getMnemonicAsBytes() {
@@ -194,15 +206,15 @@ public class DeterministicSeed implements EncryptableItem {
         }
         List<String> mnemonic = decodeMnemonicCode(crypter.decrypt(encryptedMnemonicCode, aesKey));
         byte[] seed = encryptedSeed == null ? null : crypter.decrypt(encryptedSeed, aesKey);
-        return new DeterministicSeed(mnemonic, seed, passphrase, creationTimeSeconds);
+        return new DeterministicSeed(mnemonic, seed, passphrase, creationTimeSeconds, type);
     }
 
-    public DeterministicSeed setPassphrase(String passphrase) {
-        if(isEncrypted()) {
-            throw new UnsupportedOperationException("Cannot set passphrase on encrypted seed");
+    public String getPassphrase() {
+        return passphrase;
     }
 
-        return new DeterministicSeed(mnemonicCode, seed, passphrase, creationTimeSeconds);
+    public void setPassphrase(String passphrase) {
+        this.passphrase = passphrase;
     }
 
     @Override
@@ -227,13 +239,13 @@ public class DeterministicSeed implements EncryptableItem {
      * @throws MnemonicException if check fails
      */
     public void check() throws MnemonicException {
-        if (mnemonicCode != null) {
-            Bip39MnemonicCode.INSTANCE.check(mnemonicCode);
+        if(mnemonicCode != null) {
+            type.check(mnemonicCode);
         }
     }
 
     byte[] getEntropyBytes() throws MnemonicException {
-        return Bip39MnemonicCode.INSTANCE.toEntropy(mnemonicCode);
+        return type.getEntropyBytes(mnemonicCode);
     }
 
     /** Get the mnemonic code, or null if unknown. */
@@ -265,9 +277,44 @@ public class DeterministicSeed implements EncryptableItem {
 
     public DeterministicSeed copy() {
         if(isEncrypted()) {
-            return new DeterministicSeed(encryptedMnemonicCode.copy(), encryptedSeed.copy(), creationTimeSeconds);
+            return new DeterministicSeed(encryptedMnemonicCode.copy(), encryptedSeed.copy(), creationTimeSeconds, type);
         }
 
-        return new DeterministicSeed(Arrays.copyOf(seed, seed.length), new ArrayList<>(mnemonicCode), creationTimeSeconds);
+        return new DeterministicSeed(Arrays.copyOf(seed, seed.length), new ArrayList<>(mnemonicCode), creationTimeSeconds, type);
+    }
+
+    public enum Type {
+        BIP39() {
+            public byte[] getEntropyBytes(List<String> mnemonicCode) throws MnemonicException {
+                return Bip39MnemonicCode.INSTANCE.toEntropy(mnemonicCode);
+            }
+
+            public void check(List<String> mnemonicCode) throws MnemonicException {
+                Bip39MnemonicCode.INSTANCE.check(mnemonicCode);
+            }
+
+            public byte[] toSeed(List<String> mnemonicCode, String passphrase) {
+                return Bip39MnemonicCode.toSeed(mnemonicCode, passphrase);
+            }
+        },
+        ELECTRUM() {
+            public byte[] getEntropyBytes(List<String> mnemonicCode) throws MnemonicException {
+                throw new MnemonicException("Electrum seeds do not provide entropy bytes");
+            }
+
+            public void check(List<String> mnemonicCode) throws MnemonicException {
+                ElectrumMnemonicCode.INSTANCE.check(mnemonicCode);
+            }
+
+            public byte[] toSeed(List<String> mnemonicCode, String passphrase) {
+                return ElectrumMnemonicCode.toSeed(mnemonicCode, passphrase);
+            }
+        };
+
+        public abstract byte[] getEntropyBytes(List<String> mnemonicCode) throws MnemonicException;
+
+        public abstract void check(List<String> mnemonicCode) throws MnemonicException;
+
+        public abstract byte[] toSeed(List<String> mnemonicCode, String passphrase);
     }
 }

src/main/java/com/sparrowwallet/drongo/wallet/ElectrumMnemonicCode.java

@@ -0,0 +1,62 @@
+package com.sparrowwallet.drongo.wallet;
+
+import com.sparrowwallet.drongo.Utils;
+
+import java.nio.charset.StandardCharsets;
+import java.text.Normalizer;
+import java.util.List;
+
+public class ElectrumMnemonicCode {
+    private static final int PBKDF2_ROUNDS = 2048;
+
+    private final List<String> VALID_PREFIXES = List.of("01", "100", "101");
+
+    public static ElectrumMnemonicCode INSTANCE = new ElectrumMnemonicCode();
+
+    /**
+     * Gets the word list this code uses.
+     */
+    public List<String> getWordList() {
+        return Bip39MnemonicCode.INSTANCE.getWordList();
+    }
+
+    public static byte[] toSeed(List<String> seedWords, String passphrase) {
+        String mnemonicWords = String.join(" ", seedWords);
+        return toSeed(mnemonicWords, passphrase);
+    }
+
+    public static byte[] toSeed(String mnemonicWords, String passphrase) {
+        if(passphrase == null) {
+            passphrase = "";
+        }
+
+        String mnemonic = Normalizer.normalize(mnemonicWords, Normalizer.Form.NFKD);
+        String salt = "electrum" + Normalizer.normalize(passphrase, Normalizer.Form.NFKD);
+
+        return Utils.getPbkdf2HmacSha512Hash(mnemonic.getBytes(StandardCharsets.UTF_8), salt.getBytes(StandardCharsets.UTF_8), PBKDF2_ROUNDS);
+    }
+
+    /**
+     * Check to see if a mnemonic word list is valid.
+     */
+    public void check(List<String> words) throws MnemonicException {
+        String prefix = getPrefix(words);
+        if(!VALID_PREFIXES.contains(prefix)) {
+            throw new MnemonicException("Invalid prefix " + prefix);
+        }
+    }
+
+    private String getPrefix(List<String> words) throws MnemonicException {
+        String mnemonic = String.join(" ", words);
+        mnemonic = Normalizer.normalize(mnemonic, Normalizer.Form.NFKD);
+        byte [] hash = Utils.getHmacSha512Hash("Seed version".getBytes(StandardCharsets.UTF_8), mnemonic.getBytes(StandardCharsets.UTF_8));
+        String hex = Utils.bytesToHex(hash);
+        try {
+            int prefixLength = Integer.parseInt(hex.substring(0, 1)) + 2;
+            String prefix = hex.substring(0, prefixLength);
+            return Integer.toHexString(Integer.parseInt(prefix, 16));
+        } catch(NumberFormatException e) {
+            throw new MnemonicException("Invalid prefix bytes");
+        }
+    }
+}

src/main/java/com/sparrowwallet/drongo/wallet/Keystore.java

@@ -172,14 +172,6 @@ public class Keystore {
         return keystore;
     }
 
-    public void setPassphrase(String passphrase) {
-        if(seed != null) {
-            seed = seed.setPassphrase(passphrase);
-        } else {
-            throw new UnsupportedOperationException("Cannot set passphrase on a keystore without a seed");
-        }
-    }
-
     public boolean hasSeed() {
         return seed != null;
     }