internal ECParameters ExportParameters(bool includePrivateParameters, int keySizeInBits)
{
SecKeyPair keys = GetOrGenerateKeys(keySizeInBits);
if (includePrivateParameters && keys.PrivateKey == null)
{
throw new CryptographicException(SR.Cryptography_OpenInvalidHandle);
}
byte[] keyBlob = Interop.AppleCrypto.SecKeyCopyExternalRepresentation(
includePrivateParameters ? keys.PrivateKey ! : keys.PublicKey);
try
{
AsymmetricAlgorithmHelpers.DecodeFromUncompressedAnsiX963Key(
keyBlob,
includePrivateParameters,
out ECParameters key);
switch (GetKeySize(keys))
{
case 256: key.Curve = ECCurve.NamedCurves.nistP256; break;
case 384: key.Curve = ECCurve.NamedCurves.nistP384; break;
case 521: key.Curve = ECCurve.NamedCurves.nistP521; break;
}
return(key);
}
finally
{
CryptographicOperations.ZeroMemory(keyBlob);
}
}
private static bool TryExportDataKeyParameters(
SecKeyPair keys,
bool includePrivateParameters,
ref ECParameters ecParameters)
{
if (includePrivateParameters && keys.PrivateKey == null)
{
throw new CryptographicException(SR.Cryptography_OpenInvalidHandle);
}
bool gotKeyBlob = Interop.AppleCrypto.TrySecKeyCopyExternalRepresentation(
includePrivateParameters ? keys.PrivateKey ! : keys.PublicKey,
out byte[] keyBlob);
if (!gotKeyBlob)
{
return(false);
}
try
{
AsymmetricAlgorithmHelpers.DecodeFromUncompressedAnsiX963Key(
keyBlob,
includePrivateParameters,
out ecParameters);
switch (GetKeySize(keys))
{
case 256: ecParameters.Curve = ECCurve.NamedCurves.nistP256; break;
case 384: ecParameters.Curve = ECCurve.NamedCurves.nistP384; break;
case 521: ecParameters.Curve = ECCurve.NamedCurves.nistP521; break;
default:
Debug.Fail("Unsupported curve");
throw new CryptographicException();
}
return(true);
}
finally
{
CryptographicOperations.ZeroMemory(keyBlob);
}
}
