Verify that the recovered signature isn't infinity which actually indicates that the signature was not valid. (#9)

Incorrect behaviour led to a receipts root mismatch on Ropsten in trasaction https://ropsten.etherscan.io/tx/0x04b8a54c30c2c8f64db0a77be9feed6311a63cbb4d9e39575224ed144664b09f
Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

crypto/src/main/java/net/consensys/pantheon/crypto/SECP256K1.java

@@ -167,6 +167,10 @@ public class SECP256K1 {
     final BigInteger eInvrInv = rInv.multiply(eInv).mod(n);
     final ECPoint q = ECAlgorithms.sumOfTwoMultiplies(CURVE.getG(), eInvrInv, R, srInv);
 
+    if (q.isInfinity()) {
+      return null;
+    }
+
     final byte[] qBytes = q.getEncoded(false);
     // We remove the prefix
     return new BigInteger(1, Arrays.copyOfRange(qBytes, 1, qBytes.length));
@@ -431,7 +435,7 @@ public class SECP256K1 {
       final BigInteger publicKeyBI =
           SECP256K1.recoverFromSignature(
               signature.getRecId(), signature.getR(), signature.getS(), dataHash);
-      return publicKeyBI == null ? Optional.empty() : Optional.of(create(publicKeyBI));
+      return Optional.ofNullable(publicKeyBI).map(PublicKey::create);
     }
 
     private PublicKey(final BytesValue encoded) {

ethereum/core/src/main/java/net/consensys/pantheon/ethereum/mainnet/precompiles/ECRECPrecompiledContract.java

@@ -46,7 +46,7 @@ public class ECRECPrecompiledContract extends AbstractPrecompiledContract {
     final BigInteger r = BytesValues.asUnsignedBigInteger(d.slice(64, 32));
     final BigInteger s = BytesValues.asUnsignedBigInteger(d.slice(96, 32));
 
-    Signature signature;
+    final Signature signature;
     try {
       signature = Signature.create(r, s, (byte) recId);
     } catch (final IllegalArgumentException e) {
@@ -60,7 +60,7 @@ public class ECRECPrecompiledContract extends AbstractPrecompiledContract {
     try {
       final Optional<PublicKey> recovered = PublicKey.recoverFromSignature(h, signature);
       if (!recovered.isPresent()) {
-        return BytesValue.EMPTY;
+        return Bytes32.ZERO;
       }
 
       final Bytes32 hashed = Hash.hash(recovered.get().getEncodedBytes());
@@ -68,7 +68,7 @@ public class ECRECPrecompiledContract extends AbstractPrecompiledContract {
       hashed.slice(12).copyTo(result, 12);
       return result;
     } catch (final IllegalArgumentException e) {
-      return BytesValue.EMPTY;
+      return Bytes32.ZERO;
     }
   }
 }

ethereum/core/src/test/java/net/consensys/pantheon/ethereum/mainnet/precompiles/ECRECPrecompiledContractTest.java

@@ -0,0 +1,448 @@
+package net.consensys.pantheon.ethereum.mainnet.precompiles;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import net.consensys.pantheon.ethereum.mainnet.SpuriousDragonGasCalculator;
+import net.consensys.pantheon.util.bytes.Bytes32;
+import net.consensys.pantheon.util.bytes.BytesValue;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class ECRECPrecompiledContractTest {
+
+  private final ECRECPrecompiledContract contract =
+      new ECRECPrecompiledContract(new SpuriousDragonGasCalculator());
+
+  public ECRECPrecompiledContractTest() {}
+
+  @Parameters
+  public static Object[][] parameters() {
+    return new Object[][] {
+      {
+        "acb1c19ac0832320815b5e886c6b73ad7d6177853d44b026f2a7a9e11bb899fc000000000000000000000000000000000000000000000000000000000000001c89ea49159b334f9aebbf54481b69d000d285baa341899db355a4030f6838394e540e9f9fa17bef441e32d98d5f4554cfefdc6a56101352e4b92efafd0d9646e8",
+        "0x"
+      },
+      {
+        "0x0049872459827432342344987245982743234234498724598274323423429943000000000000000000000000000000000000000000000000000000000000001be8359c341771db7f9ea3a662a1741d27775ce277961470028e054ed3285aab8e31f63eaac35c4e6178abbc2a1073040ac9bbb0b67f2bc89a2e9593ba9abe8c53",
+        "0x0c65a9d9ffc02c7c99e36e32ce0f950c7804ceda"
+      },
+      {
+        "0x82f3df49d3645876de6313df2bbe9fbce593f21341a7b03acdb9423bc171fcc9000000000000000000000000000000000000000000000000000000000000001cba13918f50da910f2d55a7ea64cf716ba31dad91856f45908dde900530377d8a112d60f36900d18eb8f9d3b4f85a697b545085614509e3520e4b762e35d0d6bd",
+        "0xc6e93f4c1920eaeaa1e699f76a7a8c18e3056074"
+      },
+      {
+        "0x0fcdd8f8c550589cbae6183bc40713beb8d11898a201d13d6d5e40bc9ebf221d000000000000000000000000000000000000000000000000000000000000001c3824317158d005cbe49614fa05798ea00f2ca9db302a5e92d55bcaecd33d33da3c7de48ebec95be7b5111a7812febed1421f839d4d480c98501b78666aefdcd3",
+        "0xfe26206ad0a5897a478dd046c56164553adaea20"
+      },
+      {
+        "0xeb9a6731fa269c24c2535aa00a4b31d7117a2791188120c71aacd97664d1cc16000000000000000000000000000000000000000000000000000000000000001c707c68dd904de055d735f9e5c4dfba46296ad38ff6ba8f0e5e3f4ae83243b84a5b1920d628abc74e4f3a09449011a9664ab9885f74fdc7628d417599207bde74",
+        "0x39c0f4fbcd41581d5b440a7c9f964b903037e09e"
+      },
+      {
+        "0xf3ae1d9176371dd31accd73bb6bbaee561a041f5ac291a548880e1abe7b19e38000000000000000000000000000000000000000000000000000000000000001b116bd86d971b70ed540dc7c13756a99ff17644ed433781a3ffcc7359541d02fc4a2358ffc21682ece870e633cc8537f04be4ff75a142ecd35a951fc95fd1de57",
+        "0x64849cfbf0353f2c80e2a1e558982f7c4738d9f1"
+      },
+      {
+        "0x69567625d007e5c915eadb8b768f008227d57f4951f9d5711dfc72a8af13d35f000000000000000000000000000000000000000000000000000000000000001ba3ef328e9f95b4a28d9b8c20f3e9fc939bf94ad3611b4e1aaabb442f1c40545f6f83fe2c067d7a35f9bcb655894d15cd6d95d5e05c9fad33b2efa67592c0a4fe",
+        "0x5026d2655bc28bee480b2f31934f0970e8acc647"
+      },
+      {
+        "0x5ecdd449eb48c111c596d6b41047547deb4bbb27eafa419d1d041d842f1d81cb000000000000000000000000000000000000000000000000000000000000001c7ee309958bcd2f7a8d0fa904f16358d7b1dd52dc653f62b0eba42eec74335a620bf25c9db104a22c77af694cdb56e115fe259eef0a5e7968698bad0a592f6a2d",
+        "0x24bf97810c294811aa8165c9a05717a7731342a0"
+      },
+      {
+        "0x9a996c7083b19106163161ad5117a11703507ac61cad659c5bb164cd9d368672000000000000000000000000000000000000000000000000000000000000001bffc032f93b534eec6f76d194821f9fa70de06f0aac391e7f105401b23ab1a23071b55820c93857ed7e079e72f65798b2d5afad4f999048c1a987152bc5dbf78a",
+        "0x9bdeac37b1bf31980c6e8cbc5bdfa38dacbc4c43"
+      },
+      {
+        "0xea3305a892449d8215a5c41c619a42aeef22f888ee1b2c370584a6eb9e16fa27000000000000000000000000000000000000000000000000000000000000001b8efcc5180b219820d57856f018a7de24b0c4c633dfae40a96a5110c4f94b947151f4320da2e79e2d5e5c0efaef659b60b7d3de1debb4e37853746395f9426f2b",
+        "0x9ded673711119881765005a33ef7bb1961bfe98d"
+      },
+      {
+        "0xebb2b43c1070b6000aaa866071de173a24dbdec57443b9467c1aa11c0090d20c000000000000000000000000000000000000000000000000000000000000001bb52ebd3ee958d6487d7a6d68faa5df32e8f34a4703201feb6ea7687c1abf5b28439215bef624ef3799919da5980f3793f6aa14fd6dc43df3c5c652a4e2f6149b",
+        "0xd4bbacccff27e6e8534d14cd8fcd665d455dddf2"
+      },
+      {
+        "0xb28e4662bf41c1043e06400119c6c7804dcea81b1e4e8555c9db5be41380b1d3000000000000000000000000000000000000000000000000000000000000001ca010458d4c545fca2831e8ee9eb7857955d083feba0080c0b58a1b94233650572bfb5978a642da7b7f255562c47404ee3ad236d9f0319413f2e5a69cfafec2cb",
+        "0x5b73664bd5ef270f91775d27f47e436d960aa853"
+      },
+      {
+        "0x694bace9fe95c0370ef0eb3c0c629186616e33469972ff6a7ecce90f3fe2ab2d000000000000000000000000000000000000000000000000000000000000001ca07e9497d29f7c9adae37b9a985c876b5b3ee6d21a9bc83cfcf27531cb5eb67879f317e2c145caaa798bb1b30fd96f32d843636559f195622f2fac69297f935a",
+        "0x200d8d10eab444331cb2a0802219771c11443205"
+      },
+      {
+        "0xc3964b44adfd407ce69ccae93c033b6418ab903c674e794681baadf3173e37c1000000000000000000000000000000000000000000000000000000000000001c28e8ff8b5d9e55740da1ab2f7cfb9b527509439b2a99117d40a2158501a5b4354cdda2112aa6a7e89019556011f50abec5c3ae48501a1594b831275a2f031999",
+        "0x4135437a672c7d48fefc4be43a26783fe030e9b7"
+      },
+      {
+        "0x0d56ee3eb6ecd6a949793c8afaa905550333dc9063bc58cdcace8a146f23b2af000000000000000000000000000000000000000000000000000000000000001cebdb65ebfd20803c364d393e4df95a3631d906d3ebeb7fae31bc5bdbf9297e6c5d4e7a93d40278c1c3ddd4659c58a0eeb01fa41a3ca78fdb184b4bf7b2e34af1",
+        "0xff2726d26e39daf03ae70b7f4cce693329e3a027"
+      },
+      {
+        "0x23fa3e10e5b041840a8bd9055e9f6aca4c9764b6b21658bd6f126e6cf821e963000000000000000000000000000000000000000000000000000000000000001c19552a6e36c2c2c8fa97534c8e0a0575420364acd73f9399a6a375cb6ab8685d619a8afcdc09d88344dce929d90eed48f9caef102acb28c632340386d168cd14",
+        "0x6c36670046a1f02fe217d95c5e78f5c84efd703e"
+      },
+      {
+        "0xe4e5120a2c41c1beac3a04fe7895fb93db7e53e33a4f279cf196ac8d12e4eccc000000000000000000000000000000000000000000000000000000000000001bc113be6e205a4851f4aa56b499aee3fe75389382fb7b4da2eb894537addf20980dac9e071a562749cce0ea9da2f4cac450509ec03ebcf23898c52b3375c29169",
+        "0x52d2883c39100d09a6b8d793e0f693fd7f2bac51"
+      },
+      {
+        "0x7b4ba1f9fd096f738c26df77a1a87a87153d5eb253a4622cc41ca1e57f678370000000000000000000000000000000000000000000000000000000000000001bbdb9a84a3eaea6f3a16bb084387c1dd1bf91c0be1300cc99ece1cf8d239d7e0d37f24155f143635a761427684207ffabfa00dda09d502056768a4e57e0f336c5",
+        "0xc65a2a9ef32f747865a119d1c044ad836a8f6d73"
+      },
+      {
+        "0x4c16d10f1bfbaa34814a39d017cdcc18590d08a52ee01be38b43742cf0f76ee9000000000000000000000000000000000000000000000000000000000000001c75d276f5646653753fdcec2ab92d27e58a59c614aab6cc3568834a4ef36819bd54bcaf3c605ed948a20e56cfe58c1595d727877b0bfa9b9b6553879ba0e08a2b",
+        "0x5cfe5b8bf54dee364ef6f411aac9bbb6eb051202"
+      },
+      {
+        "0x8e4ae0eb9cb54e2378b3d161eeedc36654269cd1bef02d68751cc1b0021b709f000000000000000000000000000000000000000000000000000000000000001c01f53df1ac64d831f7cb45bcf9037052162900e3d7fb4d62934112a8c4b257d50c0c36cc064d72ba8a3ba57b1d2eee88b0628907dfe2cf0088dbf69d89c2f1c7",
+        "0xf34405682c4deb55da399822373b632cf5ca25c0"
+      },
+      {
+        "0xb755e67b6ba34376ac93bc8f81b072df191aed5c5e1bc7131cf1556731fad13e000000000000000000000000000000000000000000000000000000000000001b61b542768763d72e298e93cf8635ac430c2155835c079eb508e47d0cff5fb1fa62fb0cf03fd42a35bd6ade27fd10ba4e22975a61c259e1e71664892cb9f89f6c",
+        "0x617c0e2ac02fd3e876fd5bd8581e73937df53c5d"
+      },
+      {
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+        "0x2b43183e036afb83fed9ad70f1bfadda5497dbba"
+      },
+      {
+        "0xff94a2c7dbfbb566784a5d0df05c461f050dbc826f622940ca96ea949f9e1a87000000000000000000000000000000000000000000000000000000000000001b66489a58f64e058f150ffdb7e22a0993f4299073fc2b0840b082850138990fb54fcaca68705d1108a555ed4733a959c8e302510098c80b5e3c9353b1a86a64de",
+        "0x81b6898913b2d49aec6e0bbcc8c192cff4d0eed8"
+      },
+      {
+        "0xf655a5caf4dba704f63f5e17e5a94535ea7d277f2b8f4d69951291319f5c2c1b000000000000000000000000000000000000000000000000000000000000001b66987335ff22966a6084e88a4dbdc96f2cfb126aba2f6a477c18bf0fb3c42f2a5f1ef94acf1184da542f3f7271032a931bfcf3afeb3a9dafca95d5aff68bdee5",
+        "0xb48bc9d6546fb5156954699062774443a7676986"
+      },
+      {
+        "0x19e7a1205c185da64a45bb5e04f35c54cd092b70bb1a1527f8372f1ae67b4bb7000000000000000000000000000000000000000000000000000000000000001becde2323e521681126ea23af56953a18166158919d3fa445e93fcf957f60185a4738fce3d006827c432e5f6c1b8d7e3450fb434172b6ab4d619fe49a09ed4b68",
+        "0x13cb19ae4e86177abfcc9d44139dcebb993ebdc1"
+      },
+      {
+        "0x42d1878efb373fb18df168ce9687fae3cf8c1afa3063fb15b44f309adae25894000000000000000000000000000000000000000000000000000000000000001b15439bd45f426bdab38723290e9691371196e2105bee21c9dc36f77b3797fb6849f66ca42c6a4d5dde4b2996f68082c930fa6466e16077b074a63551d0a36bd4",
+        "0x6d78fd01abb065be75ffeef89a9df8f87926daf1"
+      },
+      {
+        "0x91f5c73a9e6b54b896940478ac0995d6d757feb38790cfeeaa0ca0c4c0c72db7000000000000000000000000000000000000000000000000000000000000001b5d26a45936c8b69117451625649c356a7a40627635f60e038313afd5a9e8082323aa5968522ea56d32beff94e628e36ebc0ceb68cf89f7141175b3dca19e2446",
+        "0xd213383f34edd2a9d6e89dc6ed2bdedb2b875a3f"
+      },
+      {
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+        "0x0bcfc1ef1f89de5d6bcd354d797faf3047ace632"
+      },
+      {
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+        "0xe2faafdf582764fa4b65004ef676466552f4bfe3"
+      },
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+      },
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+        "0xd7f38f4cdbf5cde5a68111970cb377003f971dd6"
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+        "0xb72b25e2dc98013d1e429180a95ce8d763b92ad3"
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+        "0x270433b68a15b4979186f44c3594041e8f6fae80"
+      },
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+        "0xa6182f0f4ceb72de969d20684f71660c2cd2ada0"
+      },
+      {
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+        "0xecd91ebd69948e971744c52ceff54b5681c6d419"
+      },
+      {
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+        "0x8cd8416864cc82c1061c00a2571e2b6ef1bc8f9f"
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+      {
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+        "0xa91aefd1bddca65485567c7014ebf4b48917e3de"
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+        "0xd5be345de0dd0d15d34899173b7c375d31140f24"
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+        "0xcb7f1bf45f76e3dca564764290cbdaa64a7622fac589799a70199845682566b2000000000000000000000000000000000000000000000000000000000000001be6c9c8dc4b408518b89e5a048d36ad1426b3ace96b8518a5a9e88f286103758e0cd9a5ddac0f848eefb204dd403bffb063a718c8e1fca4c4ec94155269370b77",
+        "0xc97af81301f96ad50d9b7c64e322ef1527702278"
+      },
+      {
+        "0x21e69437899f6a37302b239fc0261c7ffabb970e8a48096475e998d2871f5bd2000000000000000000000000000000000000000000000000000000000000001b89501dd1567e56253ba097ffc663718fac90818e56ca6b393b69e9925162ce5a7262088cff050243662adfb2aac50143bf5aff60f904f2279d6f6cce5adbebdb",
+        "0xf00f8df597663bf073bcbf43f75d0e5b6caae7cb"
+      },
+      {
+        "0xf524d92f0d374b4d104786fb521265f6034cb6e2e6370d9d83464aaf8c87b0a6000000000000000000000000000000000000000000000000000000000000001b94332385b44da4cb31cc83c8d1caa85c99a85b58a812f9d3b8ab62e32c9dfc7e17f2b4d58e52bccb42bc069e8e6445a87deed25e094fe1cdce663623493c21c8",
+        "0x532f5d1695f4305a7193eecf7f17c4ae7fbd5c1c"
+      },
+      {
+        "0x739c5a643ca04c7bf21ea78cc89270a2d66662f1441879f6f0246a3b71416996000000000000000000000000000000000000000000000000000000000000001ba6f422a6fec65ac04fe923c8e7e92cd65a26b914f06124276dfdfb7ad396eb9b7613f03ab9c71d48af2c93d430a805cb9600991d92e76b504b63d55d7dd187a3",
+        "0x0b67296d0486d16d83f4f3ddb8e07a0a57c36631"
+      },
+      {
+        "0x33693f2a0c99ea981b5b11acd2c6bfbd58e43170c5a31f79b5a8eb3321858e71000000000000000000000000000000000000000000000000000000000000001b5b33ddf363736a3abd5a356eb610d2f9fd09ef6125fdcd4ff4c7775b39e87349225b33e5afebde52fe30eb987d72318e9cf095d892e7fbdcd9e5892786f49d1c",
+        "0xe5c7698dc89c75475d5d067e124696b81a0d53f5"
+      },
+      {
+        "0xdb9ffb31945e1cbe86910f30bf7129e276f0ed9d7cd623f7b74a245324ce9c82000000000000000000000000000000000000000000000000000000000000001c8b9f853439623cc3af1f15ba21c639bfb3d8ba8302fa9d1603587a537b32fcd1308adf297dde649d208fc0b323f3c36e9404ba6dc8a74510d4082c867fbe1205",
+        "0x988cfd3652a9bacc3debc441f02a8bac7913e048"
+      },
+      {
+        "0x3930cff06ebe66193b61bd2d099c001a4f1c8597276b6324ced78b401746ed82000000000000000000000000000000000000000000000000000000000000001be2f6e9aa05b5af82987c65c31c131c152e4fa58f6b52a140519b11654c3cc8970472559ab09821cfb51b6d0c96ca9e5421f78f98af0d4aa601c49a6ceb9d4a78",
+        "0xfcbbfb74050fee34c54f3b18a50d61a679f5f320"
+      },
+      {
+        "0xadf263dddf4ad5f323822773b76e64abc06230aec4bde5d8b7be5ea1193f2b6d000000000000000000000000000000000000000000000000000000000000001c8caf0f4834f493ade134f733cd97752b4b1f0a5c8ffee47b6ec05f46857557bf20de09970e1c57404cf7ca7efbcaa95c47d99a2eba76aa72bd1b44bb0486e368",
+        "0xe21d622e34869e656a1e28f278a6b8226082d153"
+      },
+      {
+        "0x9b3ef1d284641e6c3be8dddfcf29844b393729155edb1d146dd6023dd336dc46000000000000000000000000000000000000000000000000000000000000001ba08e0795bbf5850b36b4326bb104aa14a49d44eb18e31b034b1694c5bbbcfd9732580cd88ea1277b202c6d3a575e45fbb6b2e0a489b74343035bdeef5c32863a",
+        "0x7bbba2e9fca9f2ade01d6c9c0f63a12307e3fcfd"
+      },
+      {
+        "0x7eed0e79c71b7baf9b2598a7a53bcdbaffb985ec48e1560bf963aa631d5d8c92000000000000000000000000000000000000000000000000000000000000001b21a8126ccf776ed394576e3c50e10e489951886b7e8b1a9d640b5ab4c63253737f76e9955dc860d49295a3782130cabe694eb2ee34ef0dc3367b07b3efe9f3ac",
+        "0x6df661c685e9433e2f85961d15c1a1c3f2121417"
+      },
+      {
+        "0xead4ef63f6bd001593e8088cdd8ab3c0c35ba808bebb091f43240ecbd81db3b9000000000000000000000000000000000000000000000000000000000000001b30d5d51ab3a1987baf4fb41ad5a2467b4a4a1000c909d51caf389e191441634135d94ea50996b6db1b1182a2c28162058ae53c3ef52695e5cc6b17018039d90e",
+        "0xbf14cdbb0f88457c9e6225c0b87b0b0b3d38e953"
+      },
+      {
+        "0x0c24abcfa29ff1f068a19f2f1db51b6da6ab042ac0ea3d74c87465b2075377ff000000000000000000000000000000000000000000000000000000000000001b18e975c578187caeda96b6029a7ec7aa037757cfd182b5f8d71f872233c2264a6adbb4465a68fbf4a574071cc4973f5fd5e7b721c86cb7e0f47f595222e37289",
+        "0xcd6eb47247a12aea535d6fd96cad1f4c7bcb409c"
+      },
+      {
+        "0xda13687f911cf8ede5e0a4317d8b9bf691b56bc2f3f4e463c8c2eb1f61a54469000000000000000000000000000000000000000000000000000000000000001bf6e5df315197d9fe994fae7e05e33be4bd090f9533f36c6285b80478cd21c38533928bb06d48795a86c12f5ccb95758e891d8b1b2d62106e85ae36cb8414d56b",
+        "0x9765c8a57ade562c30166b7e18aef179a22da185"
+      },
+    };
+  }
+
+  @Parameter public String input;
+
+  @Parameter(1)
+  public String expectedResult;
+
+  @Test
+  public void shouldRecoverAddress() {
+    final BytesValue input = BytesValue.fromHexString(this.input);
+    final BytesValue expected = Bytes32.fromHexString(expectedResult);
+    assertThat(contract.compute(input)).isEqualTo(expected);
+  }
+}