fix: Transaction.fromBytes fails for transactions signed using an ECD…

…SA key

Signed-off-by: Nikita Lebedev <[email protected]>

sdk/src/main/java/com/hedera/hashgraph/sdk/PublicKey.java

@@ -45,6 +45,14 @@ public static PublicKey fromBytes(byte[] publicKey) {
         if (publicKey.length == Ed25519.PUBLIC_KEY_SIZE) {
             // If this is a 32 byte string, assume an Ed25519 public key
             return new PublicKeyED25519(publicKey);
+        } else if (publicKey.length == 33) {
+            // compressed 33 byte raw form
+            return new PublicKeyECDSA(publicKey);
+        } else if (publicKey.length == 65) {
+            // compress the 65 byte form
+            return new PublicKeyECDSA(
+                Key.ECDSA_SECP256K1_CURVE.getCurve().decodePoint(publicKey).getEncoded(true)
+            );
         }
 
         // Assume a DER-encoded private key descriptor

sdk/src/main/resources/addressbook/previewnet.pb

@@ -1,64 +1,64 @@
 
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sdk/src/test/java/com/hedera/hashgraph/sdk/ECDSAPublicKeyTest.java

@@ -19,12 +19,14 @@
  */
 package com.hedera.hashgraph.sdk;
 
+import java.math.BigDecimal;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
 import java.util.Collections;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatNoException;
 
 public class ECDSAPublicKeyTest {
     @Test
@@ -78,6 +80,28 @@ void keyByteSerialization3() {
         assertThat(key3Bytes).isEqualTo(key1Bytes);
     }
 
+    @Test
+    @DisplayName("public key can be recovered after transaction serialization")
+    void keyByteSerializationThroughTransaction() {
+        var senderAccount = AccountId.fromString("0.0.1337");
+        var receiverAccount = AccountId.fromString("0.0.3");
+        var transferAmount = Hbar.from(new BigDecimal("0.0001"), HbarUnit.HBAR);
+        var privateKey = PrivateKey.generateECDSA();
+        var client = Client.forTestnet()
+            .setOperator(senderAccount, privateKey);
+        var tx = new TransferTransaction()
+            .addHbarTransfer(senderAccount, transferAmount.negated())
+            .addHbarTransfer(receiverAccount, transferAmount);
+
+        tx.freezeWith(client);
+        tx.signWithOperator(client);
+
+        var bytes = tx.toBytes();
+
+        assertThatNoException().isThrownBy(() -> Transaction.fromBytes(bytes));
+        assertThat(tx.getSignatures()).isNotEmpty();
+    }
+
     @Test
     @DisplayName("public key can be recovered from string")
     void keyStringSerialization() {

sdk/src/test/java/com/hedera/hashgraph/sdk/Ed25519PublicKeyTest.java

@@ -19,6 +19,7 @@
  */
 package com.hedera.hashgraph.sdk;
 
+import java.math.BigDecimal;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
@@ -27,6 +28,7 @@
 import java.util.Collections;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatNoException;
 
 class Ed25519PublicKeyTest {
     private static final String TEST_KEY_STR = "302a300506032b6570032100e0c8ec2758a5879ffac226a13c0c516b799e72e35141a0dd828f94d37988a4b7";
@@ -84,6 +86,28 @@ void keyByteSerialization3() {
         assertThat(key3Bytes).containsExactly(key1Bytes);
     }
 
+    @Test
+    @DisplayName("public key can be recovered after transaction serialization")
+    void keyByteSerializationThroughTransaction() {
+        var senderAccount = AccountId.fromString("0.0.1337");
+        var receiverAccount = AccountId.fromString("0.0.3");
+        var transferAmount = Hbar.from(new BigDecimal("0.0001"), HbarUnit.HBAR);
+        var privateKey = PrivateKey.generateED25519();
+        var client = Client.forTestnet()
+            .setOperator(senderAccount, privateKey);
+        var tx = new TransferTransaction()
+            .addHbarTransfer(senderAccount, transferAmount.negated())
+            .addHbarTransfer(receiverAccount, transferAmount);
+
+        tx.freezeWith(client);
+        tx.signWithOperator(client);
+
+        var bytes = tx.toBytes();
+
+        assertThatNoException().isThrownBy(() -> Transaction.fromBytes(bytes));
+        assertThat(tx.getSignatures()).isNotEmpty();
+    }
+
     @Test
     @DisplayName("public key can be recovered from string")
     void keyStringSerialization() {