private static ECKey GetPrivKey(EcCurveInformation curve, string encodedKey)
{
var bi = new BigInteger(encodedKey, 16);
var privKey = new ECKey {
PublicComponent = false,
CurveProviderName = EcInformationStore.GetProvider(curve.Name),
CurveName = curve.Name,
EncodedKey = bi.ToByteArray()
};
return(privKey);
}
/// <summary>
/// Create a new elliptic curve keypair.
/// </summary>
/// <param name="curveName">Name of the elliptic curve to use as the basis.</param>
/// <returns>Elliptic curve keypair.</returns>
public static ECKeypair GenerateECKeypair(string curveName, bool generateCanary = true)
{
ECKeypair keypair;
if (curveName.Equals(DjbCurve.Curve25519.ToString()))
{
var privEntropy = new byte[Curve25519.PrivateKeySeedSizeInBytes];
StratCom.EntropySupplier.NextBytes(privEntropy);
byte[] privateKey = Curve25519.CreatePrivateKey(privEntropy);
byte[] publicKey = Curve25519.CreatePublicKey(privateKey);
byte[] canary = null;
if (generateCanary)
{
canary = new byte[128.BitsToBytes()];
StratCom.EntropySupplier.NextBytes(canary);
}
keypair = new ECKeypair {
CurveProviderName = "DJB",
CurveName = DjbCurve.Curve25519.ToString(),
EncodedPublicKey = publicKey,
EncodedPrivateKey = privateKey,
UsePermissions = AsymmetricKeyUsePermission.KeyAgreements,
ContextPermissions = KeyUseContextPermission.ManifestHeader,
ConfirmationCanary = canary
};
privEntropy.SecureWipe();
}
else if (curveName.Equals(DjbCurve.Ed25519.ToString()))
{
var privEntropy = new byte[Ed25519.PrivateKeySeedSizeInBytes];
StratCom.EntropySupplier.NextBytes(privEntropy);
byte[] privateKey = new byte[Ed25519.ExpandedPrivateKeySizeInBytes];
byte[] publicKey = new byte[Ed25519.PublicKeySizeInBytes];
Ed25519.KeyPairFromSeed(out publicKey, out privateKey, privEntropy);
byte[] canary = null;
if (generateCanary)
{
canary = new byte[128.BitsToBytes()];
StratCom.EntropySupplier.NextBytes(canary);
}
keypair = new ECKeypair {
CurveProviderName = "DJB",
CurveName = DjbCurve.Ed25519.ToString(),
EncodedPublicKey = publicKey,
EncodedPrivateKey = privateKey,
UsePermissions = AsymmetricKeyUsePermission.KeyAgreements | AsymmetricKeyUsePermission.Signatures,
ContextPermissions = KeyUseContextPermission.ManifestHeader,
ConfirmationCanary = canary
};
privEntropy.SecureWipe();
}
else
{
ECPoint Q;
BigInteger d;
GenerateECKeypair(curveName, out Q, out d);
byte[] canary = null;
if (generateCanary)
{
canary = new byte[128.BitsToBytes()];
StratCom.EntropySupplier.NextBytes(canary);
}
keypair = new ECKeypair {
CurveProviderName = EcInformationStore.GetProvider(curveName),
CurveName = curveName,
EncodedPublicKey = Q.GetEncoded(),
EncodedPrivateKey = d.ToByteArray(),
UsePermissions = AsymmetricKeyUsePermission.KeyAgreements | AsymmetricKeyUsePermission.Signatures,
ContextPermissions = KeyUseContextPermission.ManifestHeader,
ConfirmationCanary = canary
};
}
return(keypair);
}