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269 changes: 269 additions & 0 deletions
269
src/Angor/Avalonia/AngorApp.Model/BitcoinAddressValidator.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,269 @@ | ||
| namespace AngorApp.Model; | ||
|
|
||
| using System.Numerics; | ||
| using System.Security.Cryptography; | ||
|
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| public class BitcoinAddressValidator | ||
| { | ||
| public enum BitcoinAddressType | ||
| { | ||
| Unknown, | ||
| P2PKH, // Pay to Public Key Hash (Legacy) | ||
| P2SH, // Pay to Script Hash (Legacy) | ||
| P2WPKH, // Pay to Witness Public Key Hash (Native SegWit) | ||
| P2WSH // Pay to Witness Script Hash (Native SegWit) | ||
| } | ||
|
|
||
| private static readonly string Base58Alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"; | ||
| private static readonly string Bech32Alphabet = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"; | ||
|
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| public static ValidationResult ValidateBitcoinAddress(string address, BitcoinNetwork expectedNetwork) | ||
| { | ||
| if (string.IsNullOrEmpty(address)) | ||
| { | ||
| return new ValidationResult(false, "Address cannot be empty"); | ||
| } | ||
|
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| // Check if it's a Bech32 address | ||
| if (address.StartsWith("bc1") || address.StartsWith("tb1")) | ||
| { | ||
| return ValidateBech32Address(address, expectedNetwork); | ||
| } | ||
|
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| // Legacy or P2SH address validation | ||
| return ValidateLegacyAddress(address, expectedNetwork); | ||
| } | ||
|
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| private static ValidationResult ValidateLegacyAddress(string address, BitcoinNetwork expectedNetwork) | ||
| { | ||
| // Validate length for legacy addresses | ||
| if (address.Length < 26 || address.Length > 35) | ||
| { | ||
| return new ValidationResult(false, "Invalid legacy address length"); | ||
| } | ||
|
|
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| // Validate characters | ||
| var invalidChars = address.Where(c => !Base58Alphabet.Contains(c)).ToList(); | ||
| if (invalidChars.Any()) | ||
| { | ||
| return new ValidationResult(false, | ||
| $"Invalid characters in address: {string.Join(", ", invalidChars)}"); | ||
| } | ||
|
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||
| try | ||
| { | ||
| // Decode Base58 | ||
| var decoded = Base58Decode(address); | ||
|
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| // Validate decoded length | ||
| if (decoded.Length != 25) | ||
| { | ||
| return new ValidationResult(false, | ||
| $"Invalid decoded length: {decoded.Length} bytes (expected 25 bytes)"); | ||
| } | ||
|
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| // Separate components | ||
| var withoutChecksum = decoded.Take(21).ToArray(); | ||
| var checksum = decoded.Skip(21).Take(4).ToArray(); | ||
|
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| // Calculate checksum | ||
| var calculatedChecksum = CalculateChecksum(withoutChecksum); | ||
|
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| // Compare checksums | ||
| if (!checksum.SequenceEqual(calculatedChecksum)) | ||
| { | ||
| return new ValidationResult(false, "Invalid checksum"); | ||
| } | ||
|
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| // Identify version and network | ||
| var version = decoded[0]; | ||
| var (detectedNetwork, addressType) = DetermineNetworkAndType(version); | ||
|
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| if (detectedNetwork == BitcoinNetwork.Unknown) | ||
| { | ||
| return new ValidationResult(false, | ||
| $"Unrecognized version byte: 0x{version:X2}", | ||
| detectedNetwork, | ||
| addressType); | ||
| } | ||
|
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| // Validate network | ||
| if (expectedNetwork != detectedNetwork) | ||
| { | ||
| return new ValidationResult(false, | ||
| $"Address belongs to network {detectedNetwork} but expected {expectedNetwork}", | ||
| detectedNetwork, | ||
| addressType); | ||
| } | ||
|
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| return new ValidationResult(true, "Valid address", detectedNetwork, addressType); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| return new ValidationResult(false, $"Error processing address: {ex.Message}"); | ||
| } | ||
| } | ||
|
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| private static ValidationResult ValidateBech32Address(string address, BitcoinNetwork expectedNetwork) | ||
| { | ||
| try | ||
| { | ||
| // Basic Bech32 validation | ||
| if (address.Length < 14 || address.Length > 74) | ||
| { | ||
| return new ValidationResult(false, "Invalid Bech32 address length"); | ||
| } | ||
|
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| // Validate characters | ||
| var invalidChars = address.ToLower() | ||
| .Skip(4) // Skip the prefix (bc1 or tb1) and separator (1) | ||
| .Where(c => !Bech32Alphabet.Contains(c)) | ||
| .ToList(); | ||
|
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||
| if (invalidChars.Any()) | ||
| { | ||
| return new ValidationResult(false, | ||
| $"Invalid characters in Bech32 address: {string.Join(", ", invalidChars)}"); | ||
| } | ||
|
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| // Determine network from prefix | ||
| var detectedNetwork = address.ToLower().StartsWith("bc1") | ||
| ? BitcoinNetwork.Mainnet | ||
| : address.ToLower().StartsWith("tb1") | ||
| ? BitcoinNetwork.Testnet | ||
| : BitcoinNetwork.Unknown; | ||
|
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| if (detectedNetwork == BitcoinNetwork.Unknown) | ||
| { | ||
| return new ValidationResult(false, | ||
| "Invalid Bech32 address prefix", | ||
| BitcoinNetwork.Unknown, | ||
| BitcoinAddressType.Unknown); | ||
| } | ||
|
|
||
| // Validate network | ||
| if (expectedNetwork != detectedNetwork) | ||
| { | ||
| return new ValidationResult(false, | ||
| $"Address belongs to network {detectedNetwork} but expected {expectedNetwork}", | ||
| detectedNetwork, | ||
| BitcoinAddressType.Unknown); | ||
| } | ||
|
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| // Determine SegWit version and program length | ||
| var program = DecodeBech32(address); | ||
| var witnessVersion = program[0]; | ||
| var dataLength = program.Length - 1; | ||
|
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| // Validate according to BIP141 | ||
| var addressType = DetermineSegWitType(witnessVersion, dataLength); | ||
| if (addressType == BitcoinAddressType.Unknown) | ||
| { | ||
| return new ValidationResult(false, | ||
| "Invalid SegWit program length", | ||
| detectedNetwork, | ||
| BitcoinAddressType.Unknown); | ||
| } | ||
|
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| return new ValidationResult(true, "Valid SegWit address", detectedNetwork, addressType); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| return new ValidationResult(false, $"Error processing Bech32 address: {ex.Message}"); | ||
| } | ||
| } | ||
|
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| private static BitcoinAddressType DetermineSegWitType(int witnessVersion, int programLength) | ||
| { | ||
| if (witnessVersion != 0) return BitcoinAddressType.Unknown; | ||
|
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| return programLength switch | ||
| { | ||
| 20 => BitcoinAddressType.P2WPKH, | ||
| 32 => BitcoinAddressType.P2WSH, | ||
| _ => BitcoinAddressType.Unknown | ||
| }; | ||
| } | ||
|
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| private static (BitcoinNetwork network, BitcoinAddressType type) DetermineNetworkAndType(byte version) | ||
| { | ||
| return version switch | ||
| { | ||
| 0x00 => (BitcoinNetwork.Mainnet, BitcoinAddressType.P2PKH), // Mainnet P2PKH (1...) | ||
| 0x05 => (BitcoinNetwork.Mainnet, BitcoinAddressType.P2SH), // Mainnet P2SH (3...) | ||
| 0x6F => (BitcoinNetwork.Testnet, BitcoinAddressType.P2PKH), // Testnet P2PKH (m... or n...) | ||
| 0xC4 => (BitcoinNetwork.Testnet, BitcoinAddressType.P2SH), // Testnet P2SH (2...) | ||
| 0x3C => (BitcoinNetwork.Regtest, BitcoinAddressType.P2PKH), // Regtest P2PKH | ||
| 0x26 => (BitcoinNetwork.Regtest, BitcoinAddressType.P2SH), // Regtest P2SH | ||
| _ => (BitcoinNetwork.Unknown, BitcoinAddressType.Unknown) | ||
| }; | ||
| } | ||
|
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| private static byte[] Base58Decode(string base58) | ||
| { | ||
| var result = new BigInteger(0); | ||
| var multiplier = new BigInteger(1); | ||
|
|
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| // Convert from Base58 to number | ||
| for (var i = base58.Length - 1; i >= 0; i--) | ||
| { | ||
| var digit = Base58Alphabet.IndexOf(base58[i]); | ||
| if (digit == -1) | ||
| { | ||
| throw new FormatException($"Invalid character '{base58[i]}' at position {i}"); | ||
| } | ||
|
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| result += multiplier * digit; | ||
| multiplier *= Base58Alphabet.Length; | ||
| } | ||
|
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| // Convert to bytes | ||
| var bytes = result.ToByteArray().Reverse().SkipWhile(b => b == 0).ToArray(); | ||
|
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| // Add leading zeros as needed | ||
| var leadingZeros = base58.TakeWhile(c => c == '1').Count(); | ||
| var leadingZeroBytes = Enumerable.Repeat((byte)0, leadingZeros).ToArray(); | ||
|
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| return leadingZeroBytes.Concat(bytes).ToArray(); | ||
| } | ||
|
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| private static byte[] DecodeBech32(string address) | ||
| { | ||
| // Note: This is a simplified Bech32 decoder | ||
| // In a production environment, you should implement full Bech32 decoding | ||
| // including checksum verification according to BIP173 | ||
| var data = address.ToLower() | ||
| .Skip(4) // Skip prefix and separator | ||
| .Select(c => (byte)Bech32Alphabet.IndexOf(c)) | ||
| .ToArray(); | ||
|
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| return data; | ||
| } | ||
|
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| private static byte[] CalculateChecksum(byte[] data) | ||
| { | ||
| using (var sha256 = SHA256.Create()) | ||
| { | ||
| var hash1 = sha256.ComputeHash(data); | ||
| var hash2 = sha256.ComputeHash(hash1); | ||
| return hash2.Take(4).ToArray(); | ||
| } | ||
| } | ||
|
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| public class ValidationResult | ||
| { | ||
| public ValidationResult(bool isValid, string message, BitcoinNetwork network = BitcoinNetwork.Unknown, | ||
| BitcoinAddressType addressType = BitcoinAddressType.Unknown) | ||
| { | ||
| IsValid = isValid; | ||
| Message = message; | ||
| Network = network; | ||
| AddressType = addressType; | ||
| } | ||
|
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| public bool IsValid { get; } | ||
| public string Message { get; } | ||
| public BitcoinNetwork Network { get; init; } | ||
| public BitcoinAddressType AddressType { get; init; } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| using System.Threading.Tasks; | ||
| using AngorApp.Model; | ||
| using CSharpFunctionalExtensions; | ||
|
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| namespace AngorApp.Sections.Wallet.NoWallet; | ||
|
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||
| public interface IWalletFactory | ||
| { | ||
| public Task<Result<IWallet>> Recover(); | ||
| public Task<Result<IWallet>> Create(); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| using AngorApp.Model; | ||
| using CSharpFunctionalExtensions; | ||
|
|
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| namespace AngorApp.Sections.Wallet.NoWallet; | ||
|
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| public interface IWalletProvider | ||
| { | ||
| Maybe<IWallet> GetWallet(); | ||
| void SetWallet(IWallet wallet); | ||
| } |
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