fix: use StandardCharsets.UTF_8 for byte array to string conversions

CHANGELOG.md

@@ -7,6 +7,7 @@
 - fix: replace assert statements with explicit null checks in `Federation` class to ensure validation is not bypassed when assertions are disabled.
 - fix: add overflow check in `TimeBounds.expiresAfter()` to prevent integer overflow when timeout is too large.
 - fix: add validation for `ManageDataOperation` value length to ensure it does not exceed 64 bytes.
+- fix: use `StandardCharsets.UTF_8` explicitly when converting byte arrays to strings to ensure consistent behavior across different platforms.
 
 ## 2.2.1
 

src/main/java/org/stellar/sdk/Sep10Challenge.java

@@ -1,6 +1,7 @@
 package org.stellar.sdk;
 
 import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
 import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -316,7 +317,9 @@ public static ChallengeTransaction readChallengeTransaction(
 
     byte[] nonce;
     try {
-      nonce = Base64Factory.getInstance().decode(new String(manageDataOperation.getValue()));
+      nonce =
+          Base64Factory.getInstance()
+              .decode(new String(manageDataOperation.getValue(), StandardCharsets.UTF_8));
     } catch (IllegalArgumentException e) {
       throw new InvalidSep10ChallengeException(
           "Failed to decode random nonce provided in ManageData operation.", e);

src/main/java/org/stellar/sdk/Sep45Challenge.java

@@ -1,6 +1,7 @@
 package org.stellar.sdk;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -371,25 +372,25 @@ public static ChallengeAuthorizationEntries readChallengeAuthorizationEntries(
 
       switch (key) {
         case "account":
-          account = new String(Scv.fromString(valueVal));
+          account = new String(Scv.fromString(valueVal), StandardCharsets.UTF_8);
           break;
         case "home_domain":
-          homeDomain = new String(Scv.fromString(valueVal));
+          homeDomain = new String(Scv.fromString(valueVal), StandardCharsets.UTF_8);
           break;
         case "nonce":
-          nonce = new String(Scv.fromString(valueVal));
+          nonce = new String(Scv.fromString(valueVal), StandardCharsets.UTF_8);
           break;
         case "web_auth_domain":
-          webAuthDomainValue = new String(Scv.fromString(valueVal));
+          webAuthDomainValue = new String(Scv.fromString(valueVal), StandardCharsets.UTF_8);
           break;
         case "web_auth_domain_account":
-          webAuthDomainAccount = new String(Scv.fromString(valueVal));
+          webAuthDomainAccount = new String(Scv.fromString(valueVal), StandardCharsets.UTF_8);
           break;
         case "client_domain":
-          clientDomain = new String(Scv.fromString(valueVal));
+          clientDomain = new String(Scv.fromString(valueVal), StandardCharsets.UTF_8);
           break;
         case "client_domain_account":
-          clientDomainAccount = new String(Scv.fromString(valueVal));
+          clientDomainAccount = new String(Scv.fromString(valueVal), StandardCharsets.UTF_8);
           break;
         default:
           // Unknown argument, ignore

src/main/java/org/stellar/sdk/Util.java

@@ -2,6 +2,7 @@
 
 import java.io.IOException;
 import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.Arrays;
@@ -95,7 +96,7 @@ public static byte[] paddedByteArray(String string, int length) {
    * @return trimmed byte array
    */
   static String paddedByteArrayToString(byte[] bytes) {
-    String[] strArray = new String(bytes).split("\0");
+    String[] strArray = new String(bytes, StandardCharsets.UTF_8).split("\0");
     if (strArray.length > 0) {
       return strArray[0];
     }

src/main/java/org/stellar/sdk/operations/AllowTrustOperation.java

@@ -1,5 +1,6 @@
 package org.stellar.sdk.operations;
 
+import java.nio.charset.StandardCharsets;
 import lombok.AllArgsConstructor;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
@@ -57,10 +58,14 @@ public static AllowTrustOperation fromXdr(AllowTrustOp op) {
     String assetCode;
     switch (op.getAsset().getDiscriminant()) {
       case ASSET_TYPE_CREDIT_ALPHANUM4:
-        assetCode = new String(op.getAsset().getAssetCode4().getAssetCode4()).trim();
+        assetCode =
+            new String(op.getAsset().getAssetCode4().getAssetCode4(), StandardCharsets.UTF_8)
+                .trim();
         break;
       case ASSET_TYPE_CREDIT_ALPHANUM12:
-        assetCode = new String(op.getAsset().getAssetCode12().getAssetCode12()).trim();
+        assetCode =
+            new String(op.getAsset().getAssetCode12().getAssetCode12(), StandardCharsets.UTF_8)
+                .trim();
         break;
       default:
         throw new IllegalArgumentException("Unknown asset code");