private static void GenerateAddressFromPrivateKey()
{
Console.WriteLine("Random private key --> public key --> address");
Console.WriteLine("---------------------------------------------");
AsymmetricCipherKeyPair keyPair = EncryptionUtils.GenerateAsymmetricKeyPair();
BigInteger privateKey = ((ECPrivateKeyParameters)keyPair.Private).D;
Console.WriteLine("Private key (64 hex digits):\r\n" + privateKey.ToString(16));
Console.WriteLine("Private key (BigInteger):\r\n" + privateKey.ToString(10));
ECPoint publicKey = ((ECPublicKeyParameters)keyPair.Public).Q;
Console.WriteLine("Public key (2 * BigIntegers):\r\n({0}, {1})",
publicKey.XCoord.ToBigInteger(),
publicKey.YCoord.ToBigInteger());
Console.WriteLine("Public key (2 * 64 hex digits):\r\n({0}, {1})",
publicKey.XCoord,
publicKey.YCoord);
string publicKeyCompressed = HashUtils.ToHexCompressed(publicKey);
Console.WriteLine("Public key compressed (65 hex digits):\r\n" +
publicKeyCompressed);
byte[] publicAddress = HashUtils.ComputeRIPEMD160(Utils.GetBytes(publicKeyCompressed));
Console.WriteLine("Public address (40 hex digits):\r\n" + publicAddress.ToHex());
}
private static void Main(string[] args)
{
//string key = EncryptionUtils.GetRandomBytes(32).ToHex();
//string key = "0e549dbcccfbd11e255f6037e1e640efaca0e19966ac77a592fdf06d295952a4";
string key = "7e4670ae70c98d24f3662c172dc510a085578b9ccc717e6c2f4e547edd960a34";
EthECKey privateKey = new EthECKey(key);
byte[] privateKeyBytes = privateKey.GetPrivateKeyAsBytes();
Console.WriteLine("Private key (64 hex digits):\r\n" + privateKeyBytes.ToHex());
byte[] publicKeyBytes = privateKey.GetPubKeyNoPrefix();
Console.WriteLine("Public key uncompressed (2 * 64 hex digits):\r\n" + publicKeyBytes.ToHex());
ECPublicKeyParameters publicKeyParams = new ECKey(privateKeyBytes, true).GetPublicKeyParameters();
string publicKeyCompressed = HashUtils.ToHexCompressed(publicKeyParams.Q);
Console.WriteLine("Public key compressed (65 hex digits):\r\n" + publicKeyCompressed);
byte[] publicAddress = HashUtils.ComputeRIPEMD160(Utils.GetBytes(publicKeyCompressed));
Console.WriteLine("Public address (40 hex digits):\r\n" + publicAddress.ToHex());
}
private static void SignAndVerifyTransaction(
string privateKey,
string recipientAddress,
string dateCreatedIso8601,
int value,
int fee)
{
Console.WriteLine("Generate and sign a transaction");
Console.WriteLine("-------------------------------");
Console.WriteLine("Sender private key:\r\n" + privateKey);
BigInteger senderPrivateKey = new BigInteger(privateKey, 16);
ECPoint senderPublicKey = EncryptionUtils.GetPublicKey(senderPrivateKey);
string senderPublicKeyCompressed = HashUtils.ToHexCompressed(senderPublicKey);
Console.WriteLine("Sender public key compressed (65 hex digits):\r\n" +
senderPublicKeyCompressed);
string senderAddress = HashUtils.ComputeRIPEMD160(
Utils.GetBytes(senderPublicKeyCompressed)).ToHex();
Console.WriteLine("Sender address (40 hex digits):\r\n" + senderAddress);
Transaction transaction = new Transaction
{
Sender = senderAddress,
Recipient = recipientAddress,
SenderPublicKey = senderPublicKeyCompressed,
Value = value,
Fee = fee,
DateCreatedIso8601 = dateCreatedIso8601
};
string transactionJsonFormatted = JsonUtils.Serialize(transaction);
Console.WriteLine("Transaction (JSON, formatted):\r\n" + transactionJsonFormatted);
string transactionJson = JsonUtils.Serialize(transaction, false);
Console.WriteLine("Transaction (JSON):\r\n" + transactionJson);
byte[] transactionHash = HashUtils.ComputeSha256(Utils.GetBytes(transactionJson));
Console.WriteLine("Transaction hash (SHA256):\r\n" + transactionHash.ToHex());
ECDSASignature transactionSignature =
EncryptionUtils.Sign(transactionHash, senderPrivateKey);
string r = transactionSignature.R.ToString(16);
string s = transactionSignature.S.ToString(16);
Console.WriteLine("Transaction signature:\r\n({0}, {1})", r, s);
transaction.Signature = new Signature
{
R = r,
S = s
};
string signedTransactionJson = JsonUtils.Serialize(transaction);
Console.WriteLine("Signed transaction (JSON):\r\n" + signedTransactionJson);
ECPublicKeyParameters parameters =
EncryptionUtils.GetPublicKeyParameters(privateKey);
bool valid = EncryptionUtils.VerifySignature(
transactionHash, transactionSignature, parameters);
Console.WriteLine("Signature valid: " + valid);
}
private static CreateTransactionRequest CreateAndSignTransaction(
string privateKey,
string recipientAddress,
string dateCreatedIso8601,
long value,
long fee,
string data)
{
Console.WriteLine("Generate and sign a transaction");
Console.WriteLine("-------------------------------");
Console.WriteLine("Sender private key:\r\n" + privateKey);
BigInteger senderPrivateKey = new BigInteger(privateKey, 16);
ECPoint senderPublicKey = EncryptionUtils.GetPublicKey(senderPrivateKey);
string senderPublicKeyCompressed = EncryptionUtils.ToHexCompressed(senderPublicKey);
Console.WriteLine("Sender public key compressed (65 hex digits):\r\n" +
senderPublicKeyCompressed);
string senderAddress = HashUtils.ComputeRIPEMD160(
senderPublicKeyCompressed.GetBytes()).ToHex();
Console.WriteLine("Sender address (40 hex digits):\r\n" + senderAddress);
TransactionData transaction = new TransactionData
{
From = senderAddress,
To = recipientAddress,
Value = value,
Fee = fee,
DateCreated = dateCreatedIso8601,
Data = data,
SenderPubKey = senderPublicKeyCompressed
};
string transactionJsonFormatted = JsonUtils.Serialize(transaction);
Console.WriteLine("Transaction (JSON, formatted):\r\n" + transactionJsonFormatted);
string transactionJson = JsonUtils.Serialize(transaction, false);
Console.WriteLine("Transaction (JSON):\r\n" + transactionJson);
byte[] transactionDataHash = HashUtils.ComputeSha256(transactionJson.GetBytes());
Console.WriteLine("Transaction data hash (SHA256):\r\n" + transactionDataHash.ToHex());
BigInteger[] transactionSignature =
EncryptionUtils.Sign(transactionDataHash, senderPrivateKey);
string r = transactionSignature[0].ToString(16);
string s = transactionSignature[1].ToString(16);
Console.WriteLine("Transaction signature:\r\n({0}, {1})", r, s);
CreateTransactionRequest request =
CreateTransactionRequest.FromTransactionData(transaction);
request.SenderSignature = new string[] { r, s };
string signedTransactionJson = JsonUtils.Serialize(request);
Console.WriteLine("Signed transaction (JSON):\r\n" + signedTransactionJson);
return(request);
}
