static int Main(string[] args)
{
if (args.Length < 1)
{
Help();
return(0);
}
var command = args[0];
if (command.Equals("-h", StringComparison.OrdinalIgnoreCase) ||
command.Equals("/h", StringComparison.OrdinalIgnoreCase) ||
command.Equals("-?", StringComparison.OrdinalIgnoreCase) ||
command.Equals("/?", StringComparison.OrdinalIgnoreCase) ||
command.Equals("?", StringComparison.OrdinalIgnoreCase))
{
// Display the help screen
Help();
return(0);
}
else if (command.Equals("c", StringComparison.OrdinalIgnoreCase))
{
// Generate a certificate
if (args.Length < 2)
{
Error("Too few arguments were specified.");
return(ExitCode_CommandLineError);
}
#region Arguments
var processCommandLinePath = true;
Arguments:
var argIndex = 1;
string outputFile = null;
string outputCertFile = null;
string commonOutputName = null;
string outputPassword = null;
int keySize = DefaultKeySize;
string subjectName = null;
IList <string> subjectAlternativeNameList = null;
var basicKeyUsages = BasicKeyUsages.None;
bool basicKeyUsagesCritical = false;
var extendedUsages = new List <string>();
bool extendedUsagesCritical = false;
DateTime fromDate = DateTime.UtcNow.Date; // The date only
DateTime toDate = fromDate.AddYears(1);
bool toDateExplicitlySet = false;
int years = 0;
bool isCA = false;
int caLength = -1;
byte[] serialNumber = null;
string issuerPath = null;
string issuerPassword = null;
string commandLinePath = null;
#region Collect
while (argIndex < args.Length)
{
var argument = args[argIndex++].ToLower();
if (argument.Length > 0 && argument[0] == '/')
{
argument = '-' + argument.Substring(1);
}
try
{
switch (argument)
{
#region Output file
case "-o":
outputFile = args[argIndex++];
break;
case "-oc":
outputCertFile = args[argIndex++];
break;
case "-on":
commonOutputName = args[argIndex++];
break;
case "-op":
outputPassword = args[argIndex++];
break;
#endregion
#region Basic
case "-k":
if (int.TryParse(args[argIndex++], out keySize) && keySize > 0)
{
break;
}
else
{
Error("Invalid key size.");
return(ExitCode_CommandLineError);
}
case "-s":
subjectName = args[argIndex++];
try
{
X501DistinguishedName.Parse(subjectName);
}
catch (FormatException exc)
{
Error("Invalid subject distinguished name: {0}", exc.Message);
return(ExitCode_CommandLineError);
}
break;
case "-sa":
subjectAlternativeNameList = args[argIndex++].Split(',').Select(x => x.Trim()).Where(x => x.Length > 0).ToList();
break;
case "-sn":
var serialNumberText = args[argIndex++];
if (serialNumberText.StartsWith("0x", StringComparison.InvariantCultureIgnoreCase) ||
serialNumberText.StartsWith("x", StringComparison.InvariantCultureIgnoreCase))
{
// A hexadecimal string
try
{
serialNumber = ToBytes(serialNumberText.Substring(1));
break;
}
catch (FormatException)
{
Error("Invalid serial number: invalid hexadecimal string.");
return(ExitCode_CommandLineError);
}
}
else
{
// An integer number
long serialNumberLong;
if (long.TryParse(serialNumberText, out serialNumberLong))
{
serialNumber = BitConverter.GetBytes(serialNumberLong);
// Remove trailing zero bytes
serialNumber = serialNumber.Reverse().SkipWhile(x => x == 0).Reverse().ToArray();
if (serialNumber.Length == 0)
{
serialNumber = new byte[] { 0 };
}
break;
}
else
{
Error("Invalid serial number: the specified value is not an integer or is too large.");
return(ExitCode_CommandLineError);
}
}
#endregion
#region Key usage
case "-bu":
case "-buc":
basicKeyUsagesCritical = argument == "-buc";
try
{
basicKeyUsages = (BasicKeyUsages)Enum.Parse(typeof(BasicKeyUsages), args[argIndex++], true);
}
catch (ArgumentException exc)
{
Error("Invalid certificate usages: {0}", exc.Message);
return(ExitCode_CommandLineError);
}
break;
case "-eu":
case "-euc":
extendedUsagesCritical = argument == "-euc";
foreach (var item in args[argIndex++].Split(','))
{
var usage = item.Trim();
if (item.Length == 0)
{
continue;
}
string result;
switch (item.ToLower())
{
case "serverauthentication":
result = ExtendedKeyUsages.ServerAuthentication;
break;
case "clientauthentication":
result = ExtendedKeyUsages.ClientAuthentication;
break;
case "codesigning":
result = ExtendedKeyUsages.CodeSigning;
break;
case "emailprotection":
result = ExtendedKeyUsages.EmailProtection;
break;
case "timestamping":
result = ExtendedKeyUsages.TimeStamping;
break;
case "ocspsigning":
result = ExtendedKeyUsages.OCSPSigning;
break;
default:
if (item.StartsWith("oid:"))
{
result = item.Substring(4);
break;
}
else
{
Error("Invalid extended usage: '{0}'.", item);
return(ExitCode_CommandLineError);
}
}
extendedUsages.Add(result);
}
break;
#endregion
#region Validity period
case "-f":
if (DateTime.TryParse(args[argIndex++], out fromDate))
{
break;
}
else
{
Error("Invalid validity period starting date.");
return(ExitCode_CommandLineError);
}
case "-t":
if (DateTime.TryParse(args[argIndex++], out toDate))
{
toDateExplicitlySet = true;
break;
}
else
{
Error("Invalid validity period ending date.");
return(ExitCode_CommandLineError);
}
case "-y":
if (int.TryParse(args[argIndex++], out years) && years > 0)
{
break;
}
else
{
Error("Invalid number of years for which the certificate is valid.");
return(ExitCode_CommandLineError);
}
#endregion
#region CA
case "-ca":
isCA = true;
break;
case "-calen":
if (int.TryParse(args[argIndex++], out caLength) && caLength >= 0)
{
break;
}
else
{
Error("Invalid 'calen' value.");
return(ExitCode_CommandLineError);
}
#endregion
#region Issuer
case "-i":
issuerPath = args[argIndex++];
break;
case "-ip":
issuerPassword = args[argIndex++];
break;
#endregion
#region Other
case "-r":
commandLinePath = args[argIndex++];
break;
#endregion
#region Basic
case "?":
case "-?":
case "-h":
Help();
return(ExitCode_CommandLineError);
default:
Error("Invalid argument: '{0}'.", argument);
return(ExitCode_CommandLineError);
#endregion
}
}
catch (IndexOutOfRangeException)
{
Error("'{0}' must be followed by an additional parameter.", argument);
return(ExitCode_CommandLineError);
}
}
#endregion
#region Process
if (processCommandLinePath && false == string.IsNullOrEmpty(commandLinePath))
{
if (false == File.Exists(commandLinePath))
{
Error("The file containing command line arguments was not found.");
return(ExitCode_CommandLineError);
}
string[] readCommandLineArguments;
try
{
readCommandLineArguments = File.ReadAllLines(commandLinePath);
}
catch (Exception exc)
{
Error("Could not read the file containing command line arguments: {0}", exc.Message);
return(ExitCode_CommandLineError);
}
try
{
var readCommandLine = string.Join(" ", readCommandLineArguments);
readCommandLineArguments = ParseCommandLine(readCommandLine);
}
catch (Win32Exception exc)
{
Error("Could not parse the arguments read from file: {0}", exc.Message);
return(ExitCode_CommandLineError);
}
// Indicate that the command line arguments has been already processed
processCommandLinePath = false;
// The arguments specified on the command line MUST override the arguments read from the file.
// Therefore, they must follow the read arguments in the array.
// Move the command argument at the front
args = new string[] { args[0] }.Concat(readCommandLineArguments).Concat(args.Skip(1)).ToArray();
Console.WriteLine();
// Reprocess the command-line arguments
goto Arguments;
}
if (false == string.IsNullOrEmpty(commonOutputName))
{
// Apply the common name to the other parameters
if (string.IsNullOrEmpty(outputFile))
{
outputFile = Path.ChangeExtension(commonOutputName, ".pfx");
}
if (string.IsNullOrEmpty(outputCertFile))
{
outputCertFile = Path.ChangeExtension(commonOutputName, ".cer");
}
}
if (string.IsNullOrEmpty(outputFile))
{
Error("An output file must be specified.");
return(ExitCode_CommandLineError);
}
if (string.IsNullOrEmpty(subjectName))
{
Error("A subject distinguished name (DN) must be specified.");
return(ExitCode_CommandLineError);
}
if (outputPassword == null)
{
Console.Write("Enter OUTPUT file password: "******"Enter ISSUER certificate password: "******"Cannot load the certificate of the issuer: {0}", exc.Message);
return(ExitCode_CommandLineError);
}
if (false == issuerCertificate.Extensions.OfType <X509BasicConstraintsExtension>().Any(x => x.CertificateAuthority))
{
Error("The certificate of the issuer must be a CA.");
return(ExitCode_CommandLineError);
}
if (false == issuerCertificate.HasPrivateKey)
{
Error("The certificate of the issuer must has an associated private key.");
return(ExitCode_CommandLineError);
}
}
else
{
issuerCertificate = null;
}
if (serialNumber == null)
{
serialNumber = Guid.NewGuid().ToByteArray();
}
if (false == toDateExplicitlySet && years > 0)
{
toDate = fromDate.AddYears(years);
}
if (fromDate >= toDate)
{
Error("The ending of the validity period must follow its ending.");
return(ExitCode_CommandLineError);
}
#endregion
#endregion
#region Work
try
{
var builder = new X509CertificateBuilder();
Console.Write("Generating RSA key...");
// If the default key container is not used accessing the key will throw a "Key not found" exception
using (var rsa = new RSACryptoServiceProvider(keySize, new CspParameters()
{
Flags = CspProviderFlags.UseDefaultKeyContainer | CspProviderFlags.CreateEphemeralKey
}))
{
try
{
#region Key
Console.WriteLine(" Done");
builder.PublicKey = rsa;
#endregion
builder.SubjectName = subjectName;
builder.SubjectAlternativeNames = subjectAlternativeNameList;
builder.SerialNumber = serialNumber;
builder.KeyUsages = basicKeyUsages;
builder.KeyUsagesCritical = basicKeyUsagesCritical;
builder.ExtendedKeyUsages = extendedUsages.ToArray();
builder.ExtendedKeyUsagesCritical = extendedUsagesCritical;
builder.NotBefore = fromDate;
builder.NotAfter = toDate;
builder.IsCertificateAuthority = isCA;
builder.CertificateAuthorityPathLength = caLength;
if (issuerCertificate == null)
{
builder.SelfSign(rsa);
}
else
{
builder.Sign(issuerCertificate);
}
File.WriteAllBytes(outputFile, builder.ExportPkcs12(rsa, outputPassword, 1000));
var certData = builder.Export();
if (false == string.IsNullOrEmpty(outputCertFile))
{
File.WriteAllBytes(outputCertFile, certData);
}
// Display the hash of the certificate
Console.WriteLine("Certificate hash:");
foreach (var alg in HashAlgorithmList)
{
using (var hash = HashAlgorithm.Create(alg))
{
var binaryHash = hash.ComputeHash(certData);
Console.WriteLine("{0,-8}{1}", alg, BitConverter.ToString(binaryHash).Replace("-", ""));
}
}
}
finally
{
// Remove the key from the key container. Otherwise, the key will be kept on the file
// system which is completely undesirable.
rsa.PersistKeyInCsp = false;
}
}
}
catch (Exception exc)
{
Error("Unexpected error: {0}", exc.Message);
return(ExitCode_ProcessingError);
}
#endregion
Console.WriteLine();
Console.WriteLine("All done.");
return(0);
}
else if (command.Equals("h", StringComparison.OrdinalIgnoreCase))
{
// Output the hash of a certificate
if (args.Length < 2)
{
Error("Too few arguments were specified.");
return(ExitCode_CommandLineError);
}
#region Arguments
var argIndex = 1;
string fileName = args[argIndex++];
string password = null;
string algorithm = null;
while (argIndex < args.Length)
{
var argument = args[argIndex++].ToLower();
if (argument.Length > 0 && argument[0] == '/')
{
argument = '-' + argument.Substring(1);
}
try
{
switch (argument)
{
case "-p":
password = args[argIndex++];
break;
case "-a":
algorithm = args[argIndex++];
if (false == ValidHashAlgorithmList.Contains(algorithm, StringComparer.OrdinalIgnoreCase))
{
Error("Invalid hash algorithm: '{0}'.", algorithm);
return(ExitCode_CommandLineError);
}
break;
#region Basic
case "?":
case "-?":
case "-h":
Help();
return(ExitCode_CommandLineError);
default:
Error("Invalid argument: '{0}'.", argument);
return(ExitCode_CommandLineError);
#endregion
}
}
catch (IndexOutOfRangeException)
{
Error("'{0}' must be followed by an additional parameter.", argument);
return(ExitCode_CommandLineError);
}
}
#endregion
#region Processing
try
{
#region Load file
if (false == File.Exists(fileName))
{
Error("The certificate file was not found.");
return(ExitCode_CommandLineError);
}
X509Certificate2 certificate = null;
if (false == fileName.EndsWith(".pfx", StringComparison.InvariantCultureIgnoreCase))
{
// Assume that the file may be in DER format
try
{
certificate = new X509Certificate2(fileName);
}
catch (CryptographicException)
{
// The file may be encrypted so ignore the error
}
}
if (certificate == null)
{
if (password == null)
{
// Prompt the user for a password
Console.Write("Enter PFX password: "******"Cannot load the certificate: {0}", exc.Message);
return(ExitCode_CommandLineError);
}
}
#endregion
if (string.Equals(algorithm, "SHA1", StringComparison.OrdinalIgnoreCase))
{
// Only the SHA1 hash must be displayed
Console.WriteLine(certificate.GetCertHashString());
}
else if (algorithm != null)
{
// Display the hash only for the specified algorithm
using (var hash = HashAlgorithm.Create(algorithm))
{
var binaryHash = hash.ComputeHash(certificate.GetRawCertData());
Console.WriteLine(BitConverter.ToString(binaryHash).Replace("-", ""));
}
}
else
{
// Display the hash for all supported algorithms
var certData = certificate.GetRawCertData();
foreach (var alg in HashAlgorithmList)
{
using (var hash = HashAlgorithm.Create(alg))
{
var binaryHash = hash.ComputeHash(certData);
Console.WriteLine("{0,-8}{1}", alg, BitConverter.ToString(binaryHash).Replace("-", ""));
}
}
}
}
catch (Exception exc)
{
Error("Unexpected error: {0}", exc.Message);
return(ExitCode_ProcessingError);
}
#endregion
return(0);
}
else
{
Error("Unknown command '{0}'. Run the program without arguments to see the help screen.", command);
return(ExitCode_CommandLineError);
}
}
byte[] GenerateCertificate(Options options)
{
var builder = new X509CertificateBuilder();
// If the default key container is not used accessing the key will throw a "Key not found" exception
using (var rsa = new RSACryptoServiceProvider(options.keySize, new CspParameters()
{
Flags = CspProviderFlags.UseDefaultKeyContainer | CspProviderFlags.CreateEphemeralKey
}))
{
try
{
#region Key
builder.PublicKey = rsa;
#endregion
builder.SubjectName = options.subjectName;
builder.SubjectAlternativeNames = options.subjectAlternativeNames;
builder.SerialNumber = options.serialNumber;
builder.KeyUsages = options.basicKeyUsages;
builder.KeyUsagesCritical = options.basicKeyUsagesCritical;
if (options.extendedUsages != null)
{
builder.ExtendedKeyUsages = options.extendedUsages.ToArray();
}
builder.ExtendedKeyUsagesCritical = options.extendedUsagesCritical;
builder.NotBefore = options.fromDate;
builder.NotAfter = options.toDate;
builder.IsCertificateAuthority = options.isCA;
builder.CertificateAuthorityPathLength = options.caLength;
if (options.issuerCertificate == null)
{
builder.SelfSign(rsa);
}
else
{
builder.Sign(options.issuerCertificate);
}
File.WriteAllBytes(options.outputFile, builder.ExportPkcs12(rsa, options.outputPassword, 1000));
var certData = builder.Export();
if (false == string.IsNullOrEmpty(options.outputCertFile))
{
File.WriteAllBytes(options.outputCertFile, certData);
}
return(certData);
}
finally
{
// Remove the key from the key container. Otherwise, the key will be kept on the file
// system which is completely undesirable.
rsa.PersistKeyInCsp = false;
}
}
}
