/// <summary>
/// Check if a file is PEM formated.
/// </summary>
/// <param name="fileName">source file name.</param>
/// <returns>true:Yes, false:No.</returns>
public static bool IsPemFormatedFile(string fileName)
{
bool retval = false;
try
{
FileStream fs = new FileStream(fileName, System.IO.FileMode.Open);
byte[] data = new byte[fs.Length];
fs.Read(data, 0, data.Length);
fs.Close();
string dataStr = Asn1Util.BytesToString(data);
retval = IsPemFormated(dataStr);
}
catch
{
retval = false;
}
return(retval);
}
/// <summary>
/// Retrieve the node description.
/// </summary>
/// <param name="pureHexMode">true:Return hex string only;
/// false:Convert to more readable string depending on the node tag.</param>
/// <returns>string</returns>
public string GetDataStr(bool pureHexMode)
{
const int lineLen = 32;
string dataStr = "";
if (pureHexMode)
{
dataStr = Asn1Util.FormatString(Asn1Util.ToHexString(data), lineLen, 2);
}
else
{
switch (tag)
{
case Asn1Tag.BIT_STRING:
dataStr = Asn1Util.FormatString(Asn1Util.ToHexString(data), lineLen, 2);
break;
case Asn1Tag.OBJECT_IDENTIFIER:
Oid xoid = new Oid();
dataStr = xoid.Decode(new MemoryStream(data));
break;
case Asn1Tag.RELATIVE_OID:
RelativeOid roid = new RelativeOid();
dataStr = roid.Decode(new MemoryStream(data));
break;
case Asn1Tag.PRINTABLE_STRING:
case Asn1Tag.IA5_STRING:
case Asn1Tag.UNIVERSAL_STRING:
case Asn1Tag.VISIBLE_STRING:
case Asn1Tag.NUMERIC_STRING:
case Asn1Tag.UTC_TIME:
case Asn1Tag.BMPSTRING:
case Asn1Tag.GENERAL_STRING:
case Asn1Tag.GENERALIZED_TIME:
dataStr = Asn1Util.BytesToString(data);
break;
case Asn1Tag.UTF8_STRING:
UTF8Encoding utf8 = new UTF8Encoding();
dataStr = utf8.GetString(data);
break;
case Asn1Tag.INTEGER:
dataStr = Asn1Util.FormatString(Asn1Util.ToHexString(data), lineLen, 2);
break;
default:
if ((tag & Asn1Tag.TAG_MASK) == 6 || // Visible string for certificate
Asn1Util.IsAsciiString(Data))
{
dataStr = Asn1Util.BytesToString(data);
}
else
{
dataStr = Asn1Util.FormatString(Asn1Util.ToHexString(data), lineLen, 2);
}
break;
}
;
}
return(dataStr);
}