static void Main(string[] args)
{
// Create a secp256k1 context (ensure disposal to prevent unmanaged memory leaks).
using (var secp256k1 = new Secp256k1())
{
// Generate a private key.
var privateKey = new byte[32];
var rnd = System.Security.Cryptography.RandomNumberGenerator.Create();
do
{
rnd.GetBytes(privateKey);
}while (!secp256k1.SecretKeyVerify(privateKey));
// Create public key from private key.
var publicKey = new byte[64];
Debug.Assert(secp256k1.PublicKeyCreate(publicKey, privateKey));
// Sign a message hash.
var messageBytes = Encoding.UTF8.GetBytes("Hello world.");
var messageHash = System.Security.Cryptography.SHA256.Create().ComputeHash(messageBytes);
var signature = new byte[64];
Debug.Assert(secp256k1.Sign(signature, messageHash, privateKey));
// Serialize a DER signature from ECDSA signature
byte[] signatureDer = new byte[Secp256k1.SERIALIZED_DER_SIGNATURE_MAX_SIZE];
int outL = 0;
Debug.Assert(secp256k1.SignatureSerializeDer(signatureDer, signature, out outL));
Array.Resize(ref signatureDer, outL);
// Verify message hash.
Debug.Assert(secp256k1.Verify(signature, messageHash, publicKey));
}
}
public byte[] Sign(HashDigest <T> messageHash, PrivateKey privateKey)
{
lock (_instanceLock)
{
var secp256K1Signature = new byte[Secp256k1.SIGNATURE_LENGTH];
var privateKeyBytes = new byte[Secp256k1.PRIVKEY_LENGTH];
privateKey.ByteArray.CopyTo(
privateKeyBytes,
Secp256k1.PRIVKEY_LENGTH - privateKey.ByteArray.Length);
_instance.Sign(
secp256K1Signature,
messageHash.ToByteArray(),
privateKeyBytes);
var signature = new byte[Secp256k1.SERIALIZED_DER_SIGNATURE_MAX_SIZE];
_instance.SignatureSerializeDer(
signature,
secp256K1Signature,
out int signatureLength);
return(signature.Take(signatureLength).ToArray());
}
}
//Ignore this function as this is just to create Public Private key pairs for testing
public static void GenerateKeys()
{
using (var secp256k1 = new Secp256k1())
{
// privatekey= "105c301c92f5d956ad577105e71aba4d29cf7af04cd47c648244dd8ad677381f"
// publickey = "7a89dec4cc7e0964ed4c5e517f1cfee7e4f145e8500f55fe0317f97e71b7ba5219a4215b1885ac547da87bd0155d02c9bbe0501d0670a4f481df2b42f2130c02"
// Generate a private key.
var privateKey = new byte[32];
var rnd = System.Security.Cryptography.RandomNumberGenerator.Create();
do
{
rnd.GetBytes(privateKey);
}while (!secp256k1.SecretKeyVerify(privateKey));
var prk = ToHex(privateKey);
// Create public key from private key.
var publicKey = new byte[64];
Debug.Assert(secp256k1.PublicKeyCreate(publicKey, privateKey));
var pbk = ToHex(publicKey);
// Sign a message hash.
var messageBytes = Encoding.UTF8.GetBytes("Hello world.");
var messageHash = System.Security.Cryptography.SHA256.Create().ComputeHash(messageBytes);
var signature = new byte[64];
Debug.Assert(secp256k1.Sign(signature, messageHash, privateKey));
// Serialize a DER signature from ECDSA signature
byte[] signatureDer = new byte[Secp256k1.SERIALIZED_DER_SIGNATURE_MAX_SIZE];
int outL = 0;
Debug.Assert(secp256k1.SignatureSerializeDer(signatureDer, signature, out outL));
Array.Resize(ref signatureDer, outL);
// Verify message hash.
Debug.Assert(secp256k1.Verify(signature, messageHash, publicKey));
}
}