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Backend: implement Silent Payments sending
Implemented sending of Silent Payments (BIP-352). Created tests for Silent Payments based on test data for BIP-352. Updated NBitcoin to version 7.0.13 because older NBitcoin versions can't decode bech32 strings of length > 90, which is needed for Silent Payment address decoding. Use property UnknownParameters of BitcoinUrlBuilder as UnknowParameters is deprecated. Had to change some code since return type of new property is different.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,112 @@ | ||
| namespace GWallet.Backend.Tests | ||
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| open System.IO | ||
| open System.Reflection | ||
| open System.Text.Json | ||
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| open NUnit.Framework | ||
| open NBitcoin | ||
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| open GWallet.Backend.UtxoCoin | ||
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| type private TestInput = | ||
| { | ||
| TxId: string | ||
| Vout: int | ||
| ScriptSig: string | ||
| TxInWitness: string | ||
| ScriptPubKey: string | ||
| PrivateKey: string | ||
| } | ||
| static member FromJsonElement(jsonElement: JsonElement) = | ||
| { | ||
| TxId = jsonElement.GetProperty("txid").GetString() | ||
| Vout = jsonElement.GetProperty("vout").GetInt32() | ||
| ScriptSig = jsonElement.GetProperty("scriptSig").GetString() | ||
| TxInWitness = jsonElement.GetProperty("txinwitness").GetString() | ||
| ScriptPubKey = jsonElement.GetProperty("prevout").GetProperty("scriptPubKey").GetProperty("hex").GetString() | ||
| PrivateKey = jsonElement.GetProperty("private_key").GetString() | ||
| } | ||
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| [<TestFixture>] | ||
| type SilentPayments() = | ||
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| let executingAssembly = Assembly.GetExecutingAssembly() | ||
| let binPath = executingAssembly.Location |> FileInfo | ||
| let projectDirPath = Path.Combine(binPath.Directory.FullName, "..", "..", "..") | ||
| let dataDir = Path.Combine(projectDirPath, "data") |> DirectoryInfo | ||
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| [<Test>] | ||
| member __.``Test creating outputs using test vectors from BIP-352``() = | ||
| // https://github.com/bitcoin/bips/blob/master/bip-0352/send_and_receive_test_vectors.json | ||
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| let testVectorsFileName = "send_and_receive_test_vectors.json" | ||
| let testVectorsJson = JsonDocument.Parse(File.ReadAllText(Path.Combine(dataDir.FullName, testVectorsFileName))) | ||
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| for testCase in testVectorsJson.RootElement.EnumerateArray() do | ||
| let testCaseName = testCase.GetProperty("comment").GetString() | ||
| let sending = testCase.GetProperty("sending").[0] | ||
| let expectedOutputs = | ||
| sending.GetProperty("expected").GetProperty("outputs").EnumerateArray() | ||
| |> Seq.map (fun each -> each.EnumerateArray() |> Seq.toArray) | ||
| |> Seq.toArray | ||
| let given = sending.GetProperty "given" | ||
| let inputs = given.GetProperty("vin").EnumerateArray() |> Seq.map TestInput.FromJsonElement |> Seq.toList | ||
| let recipients = | ||
| given.GetProperty("recipients").EnumerateArray() | ||
| |> Seq.map (fun each -> each.GetString() |> SilentPaymentAddress.Decode) | ||
| |> Seq.toList | ||
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| if expectedOutputs.Length > 1 || (expectedOutputs.Length = 1 && expectedOutputs.[0].Length > 1) || recipients.Length > 1 then | ||
| printfn "Skipping BIP-352 test case '%s'" testCaseName | ||
| else | ||
| printfn "Running BIP-352 test case '%s'" testCaseName | ||
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| let expectedOutput = expectedOutputs.[0] |> Array.tryHead |> Option.map (fun elem -> elem.GetString()) | ||
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| let spInputs = | ||
| inputs | ||
| |> List.map ( | ||
| fun input -> | ||
| let witness = | ||
| match input.TxInWitness with | ||
| | "" -> None | ||
| | hex -> | ||
| let stream = BitcoinStream(DataEncoders.Encoders.Hex.DecodeData hex) | ||
| Some <| WitScript.Load stream | ||
| let spInput = | ||
| SilentPayments.convertToSilentPaymentInput | ||
| (Script.FromHex input.ScriptPubKey) | ||
| (DataEncoders.Encoders.Hex.DecodeData input.ScriptSig) | ||
| witness | ||
| input, spInput) | ||
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| let maybePrivateKeys, outpoints = | ||
| spInputs | ||
| |> List.choose | ||
| (fun (input, spInput) -> | ||
| let privKey = new Key(DataEncoders.Encoders.Hex.DecodeData input.PrivateKey) | ||
| let outPoint = OutPoint(uint256.Parse input.TxId, input.Vout) | ||
| match spInput with | ||
| | InputForSharedSecretDerivation(_pubKey) -> | ||
| let isTapRoot = (Script.FromHex input.ScriptPubKey).IsScriptType ScriptType.Taproot | ||
| Some (Some(privKey, isTapRoot), outPoint) | ||
| | InputJustForSpending -> | ||
| Some(None, outPoint) | ||
| | _ -> None) | ||
| |> List.unzip | ||
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| let privateKeys = maybePrivateKeys |> List.choose id | ||
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| match privateKeys, expectedOutput with | ||
| | [], None -> () | ||
| | [], Some _ -> | ||
| Assert.Fail(sprintf "No inputs for shared secret derivation in test case '%s'" testCaseName) | ||
| | _, Some expectedOutputString -> | ||
| let output = SilentPayments.createOutput privateKeys outpoints recipients.[0] | ||
| let outputString = output.GetEncoded() |> DataEncoders.Encoders.Hex.EncodeData | ||
| Assert.AreEqual(expectedOutputString, outputString, sprintf "Failure in test case '%s'" testCaseName) | ||
| | _, None -> | ||
| Assert.Throws(fun () -> SilentPayments.createOutput privateKeys outpoints recipients.[0] |> ignore) | ||
| |> ignore |
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