/// <summary>
/// Processes records from the input pipeline.
/// For each input object, the command decrypts the data,
/// then exports a new SecureString created from the object.
/// </summary>
protected override void ProcessRecord()
{
SecureString importedString = null;
Utils.CheckArgForNullOrEmpty(_s, "String");
try
{
string encryptedContent = String;
byte[] iv = null;
// If this is a V2 package
if (String.IndexOf(SecureStringHelper.SecureStringExportHeader,
StringComparison.OrdinalIgnoreCase) == 0)
{
try
{
// Trim out the header, and retrieve the
// rest of the string
string remainingData = this.String.Substring(
SecureStringHelper.SecureStringExportHeader.Length,
String.Length - SecureStringHelper.SecureStringExportHeader.Length);
// Unpack it from Base64, get the string
// representation, then parse it into its components.
byte[] inputBytes = Convert.FromBase64String(remainingData);
string dataPackage = System.Text.Encoding.Unicode.GetString(inputBytes);
string[] dataElements = dataPackage.Split(Utils.Separators.Pipe);
if (dataElements.Length == 3)
{
encryptedContent = dataElements[2];
iv = Convert.FromBase64String(dataElements[1]);
}
}
catch (FormatException)
{
// Will be raised if we can't convert the
// input from a Base64 string. This means
// it's not really a V2 package.
encryptedContent = String;
iv = null;
}
}
if (SecureKey != null)
{
Dbg.Diagnostics.Assert(Key == null, "Only one encryption key should be specified");
importedString = SecureStringHelper.Decrypt(encryptedContent, SecureKey, iv);
}
else if (Key != null)
{
importedString = SecureStringHelper.Decrypt(encryptedContent, Key, iv);
}
else if (!AsPlainText)
{
importedString = SecureStringHelper.Unprotect(String);
}
else
{
importedString = SecureStringHelper.FromPlainTextString(String);
}
}
catch (ArgumentException e)
{
ErrorRecord er =
SecurityUtils.CreateInvalidArgumentErrorRecord(
e,
"ImportSecureString_InvalidArgument"
);
WriteError(er);
}
catch (CryptographicException e)
{
ErrorRecord er =
SecurityUtils.CreateInvalidArgumentErrorRecord(
e,
"ImportSecureString_InvalidArgument_CryptographicError"
);
WriteError(er);
}
if (importedString != null)
{
WriteObject(importedString);
}
}