/// <summary>
/// Encrypts the ballot selections
/// </summary>
/// <param name="selections"></param>
/// <param name="expectedNumberOfSelected"></param>
/// <param name="electionGuardConfig"></param>
/// <param name="externalIdentifier"></param>
/// <param name="exportPath"></param>
/// <param name="exportFileName"></param>
/// <returns>EncryptBallotResult containing the encrypted ballot, its external id, its tracker string,
/// and the file that includes the ballot</returns>
public static EncryptBallotResult EncryptBallot(
bool[] selections, int expectedNumberOfSelected, ElectionGuardConfig electionGuardConfig, string externalIdentifier,
string exportPath = "./", string exportFileName = "")
{
var apiConfig = electionGuardConfig.GetApiConfig();
var serializedBytesWithGcHandle = ByteSerializer.ConvertFromBase64String(electionGuardConfig.JointPublicKey);
apiConfig.SerializedJointPublicKey = serializedBytesWithGcHandle.SerializedBytes;
var encryptedBallotMessage = new SerializedBytes();
var trackerPtr = new IntPtr();
try
{
var success = API.EncryptBallot(
selections.Select(b => (byte)(b ? 1 : 0)).ToArray(),
(uint)expectedNumberOfSelected,
apiConfig,
externalIdentifier,
out encryptedBallotMessage,
exportPath,
exportFileName,
out IntPtr outputFilename,
out trackerPtr);
if (!success)
{
throw new Exception("ElectionGuardAPI EncryptBallot failed");
}
var result = new EncryptBallotResult()
{
ExternalIdentifier = externalIdentifier,
EncryptedBallotMessage = ByteSerializer.ConvertToBase64String(encryptedBallotMessage),
Tracker = Marshal.PtrToStringAnsi(trackerPtr),
OutputFileName = Marshal.PtrToStringAnsi(outputFilename),
};
return(result);
}
finally
{
// Free unmanaged memory
API.FreeEncryptBallot(encryptedBallotMessage, trackerPtr);
serializedBytesWithGcHandle.Handle.Free();
}
}
