public Span <byte> CreatePublicKey(Span <byte> privateKey, DisposableContext?context = null)
{
Secp256k1Net.Secp256k1?dsa = context?.Context as Secp256k1Net.Secp256k1;
if (dsa == null)
{
dsa = new Secp256k1Net.Secp256k1();
}
try
{
Span <byte> publicKey = new byte[PublicKeyLength];
if (!dsa.PublicKeyCreate(publicKey, privateKey))
{
throw new CryptoException("Can't create public key from private key");
}
return(publicKey);
}
finally
{
if (context == null)
{
dsa?.Dispose();
}
}
}
public Span <byte> GetSECUncompressedPublicKey(Span <byte> uncompressed, DisposableContext?context = null)
{
Secp256k1Net.Secp256k1?dsa = context?.Context as Secp256k1Net.Secp256k1;
if (dsa == null)
{
dsa = new Secp256k1Net.Secp256k1();
}
try
{
Span <byte> uncompressedBtc = new byte[PublicKeyUncompressedLength];
if (!dsa.PublicKeySerialize(uncompressedBtc, uncompressed, Secp256k1Net.Flags.SECP256K1_EC_UNCOMPRESSED))
{
throw new CryptoException("Can't create public uncompressed bitcoin key from uncompressed key");
}
return(uncompressedBtc);
}
finally
{
if (context == null)
{
dsa?.Dispose();
}
}
}
public Signature SignHash(Hash256 hash, Key key, DisposableContext?context = null)
{
Secp256k1Net.Secp256k1?dsa = context?.Context as Secp256k1Net.Secp256k1;
if (dsa == null)
{
dsa = new Secp256k1Net.Secp256k1();
}
try
{
Span <byte> signature = new byte[SignatureLength];
if (!dsa.Sign(signature, hash.Bytes, key.PrivateKey))
{
throw new CryptoException("Secp256k1 sign failure");
}
return(new Signature {
Bytes = signature
});
}
finally
{
if (context == null)
{
dsa?.Dispose();
}
}
}
public Key CreateKey(DisposableContext?context = null)
{
Secp256k1Net.Secp256k1?dsa = context?.Context as Secp256k1Net.Secp256k1;
if (dsa == null)
{
dsa = new Secp256k1Net.Secp256k1();
}
try
{
Key key = this.CreatePrivateKey();
key.PublicKey = new byte[PublicKeyLength];
if (!dsa.PublicKeyCreate(key.PublicKey, key.PrivateKey))
{
throw new CryptoException("Secp256k1 can't create public key from private key");
}
return(key);
}
finally
{
if (context == null)
{
dsa?.Dispose();
}
}
}
public bool VerifyHash(Hash256 hash, Signature signature, Key key, DisposableContext?context = null)
{
Secp256k1Net.Secp256k1?dsa = context?.Context as Secp256k1Net.Secp256k1;
if (dsa == null)
{
dsa = new Secp256k1Net.Secp256k1();
}
try
{
return(dsa.Verify(signature.Bytes, hash.Bytes, key.PublicKey));
}
finally
{
if (context == null)
{
dsa?.Dispose();
}
}
}
public bool IsPrivateKeyValid(Key key, DisposableContext?context = null)
{
Secp256k1Net.Secp256k1?dsa = context?.Context as Secp256k1Net.Secp256k1;
if (dsa == null)
{
dsa = new Secp256k1Net.Secp256k1();
}
try
{
return(dsa.SecretKeyVerify(key.PrivateKey));
}
finally
{
if (context == null)
{
dsa?.Dispose();
}
}
}
public void TestSecp256k1UseSharedContextWithSameKey()
{
using var secp256k1 = new Secp256k1Net.Secp256k1();
using (var context = new Secp256k1DotNetContext(secp256k1))
{
IECDsa signer = new Secp256k1DotNet();
var key = signer.CreateKey();
for (var loop = 0; loop < 1000; loop++)
{
using var rnd = RandomNumberGenerator.Create();
var data = new byte[32];
rnd.GetBytes(data);
var hash = data.Hash();
var signature = signer.SignHash(hash, key, context);
if (!signer.VerifyHash(hash, signature, key, context))
{
throw new Exception();
}
}
}
}
