Merge pull request ethereum#14604 from bas-vk/mobile-getfrom

mobile: use EIP155 signer for determining sender

Author: karalabe

mobile/android_test.go

@@ -37,6 +37,9 @@ package go;
 import android.test.InstrumentationTestCase;
 import android.test.MoreAsserts;
 
+import java.math.BigInteger;
+import java.util.Arrays;
+
 import org.ethereum.geth.*;
 
 public class AndroidTest extends InstrumentationTestCase {
@@ -115,6 +118,32 @@ public class AndroidTest extends InstrumentationTestCase {
 			fail(e.toString());
 		}
 	}
+
+	// Tests that recovering transaction signers works for both Homestead and EIP155
+	// signatures too. Regression test for go-ethereum issue #14599.
+	public void testIssue14599() {
+		try {
+			byte[] preEIP155RLP = new BigInteger("f901fc8032830138808080b901ae60056013565b6101918061001d6000396000f35b3360008190555056006001600060e060020a6000350480630a874df61461003a57806341c0e1b514610058578063a02b161e14610066578063dbbdf0831461007757005b610045600435610149565b80600160a060020a031660005260206000f35b610060610161565b60006000f35b6100716004356100d4565b60006000f35b61008560043560243561008b565b60006000f35b600054600160a060020a031632600160a060020a031614156100ac576100b1565b6100d0565b8060018360005260205260406000208190555081600060005260206000a15b5050565b600054600160a060020a031633600160a060020a031614158015610118575033600160a060020a0316600182600052602052604060002054600160a060020a031614155b61012157610126565b610146565b600060018260005260205260406000208190555080600060005260206000a15b50565b60006001826000526020526040600020549050919050565b600054600160a060020a031633600160a060020a0316146101815761018f565b600054600160a060020a0316ff5b561ca0c5689ed1ad124753d54576dfb4b571465a41900a1dff4058d8adf16f752013d0a01221cbd70ec28c94a3b55ec771bcbc70778d6ee0b51ca7ea9514594c861b1884", 16).toByteArray();
+			preEIP155RLP = Arrays.copyOfRange(preEIP155RLP, 1, preEIP155RLP.length);
+
+			byte[] postEIP155RLP = new BigInteger("f86b80847735940082520894ef5bbb9bba2e1ca69ef81b23a8727d889f3ef0a1880de0b6b3a7640000802ba06fef16c44726a102e6d55a651740636ef8aec6df3ebf009e7b0c1f29e4ac114aa057e7fbc69760b522a78bb568cfc37a58bfdcf6ea86cb8f9b550263f58074b9cc", 16).toByteArray();
+			postEIP155RLP = Arrays.copyOfRange(postEIP155RLP, 1, postEIP155RLP.length);
+
+			Transaction preEIP155 =  new Transaction(preEIP155RLP);
+			Transaction postEIP155 = new Transaction(postEIP155RLP);
+
+			preEIP155.getFrom(null);           // Homestead should accept homestead
+			preEIP155.getFrom(new BigInt(4));  // EIP155 should accept homestead (missing chain ID)
+			postEIP155.getFrom(new BigInt(4)); // EIP155 should accept EIP 155
+
+			try {
+				postEIP155.getFrom(null);
+				fail("EIP155 transaction accepted by Homestead");
+			} catch (Exception e) {}
+		} catch (Exception e) {
+			fail(e.toString());
+		}
+	}
 }
 `
 

mobile/types.go

@@ -264,8 +264,11 @@ func (tx *Transaction) GetHash() *Hash    { return &Hash{tx.tx.Hash()} }
 func (tx *Transaction) GetSigHash() *Hash { return &Hash{tx.tx.SigHash(types.HomesteadSigner{})} }
 func (tx *Transaction) GetCost() *BigInt  { return &BigInt{tx.tx.Cost()} }
 
-func (tx *Transaction) GetFrom() (address *Address, _ error) {
-	from, err := types.Sender(types.HomesteadSigner{}, tx.tx)
+func (tx *Transaction) GetFrom(chainID *BigInt) (address *Address, _ error) {
+	if chainID == nil { // Null passed from mobile app
+		chainID = new(BigInt)
+	}
+	from, err := types.Sender(types.NewEIP155Signer(chainID.bigint), tx.tx)
 	return &Address{from}, err
 }