private string ExportPrivateKey() //TextWriter outputStream)
{
StringBuilder pemPrivateKey = new StringBuilder();
if (CryptoServiceProvider.PublicOnly)
{
throw new ArgumentException("CSP does not contain a private key", "csp");
}
var parameters = CryptoServiceProvider.ExportParameters(true);
using (var stream = new MemoryStream()) {
var writer = new BinaryWriter(stream);
writer.Write((byte)0x30); // SEQUENCE
using (var innerStream = new MemoryStream()) {
var innerWriter = new BinaryWriter(innerStream);
EncodeIntegerBigEndian(innerWriter, new byte[] { 0x00 }); // Version
EncodeIntegerBigEndian(innerWriter, parameters.Modulus);
EncodeIntegerBigEndian(innerWriter, parameters.Exponent);
EncodeIntegerBigEndian(innerWriter, parameters.D);
EncodeIntegerBigEndian(innerWriter, parameters.P);
EncodeIntegerBigEndian(innerWriter, parameters.Q);
EncodeIntegerBigEndian(innerWriter, parameters.DP);
EncodeIntegerBigEndian(innerWriter, parameters.DQ);
EncodeIntegerBigEndian(innerWriter, parameters.InverseQ);
var length = (int)innerStream.Length;
EncodeLength(writer, length);
writer.Write(innerStream.GetBuffer(), 0, length);
}
var base64 = Convert.ToBase64String(stream.GetBuffer(), 0, (int)stream.Length).ToCharArray();
// outputStream.WriteLine("-----BEGIN RSA PRIVATE KEY-----");
pemPrivateKey.AppendLine("-----BEGIN RSA PRIVATE KEY-----");
// Output as Base64 with lines chopped at 64 characters
for (var i = 0; i < base64.Length; i += 64)
{
// outputStream.WriteLine(base64, i, Math.Min(64, base64.Length - i));
pemPrivateKey.AppendLine(new String(base64, i, Math.Min(64, base64.Length - i)));
}
// outputStream.WriteLine("-----END RSA PRIVATE KEY-----");
pemPrivateKey.AppendLine("-----END RSA PRIVATE KEY-----");
}
return(pemPrivateKey.ToString());
}
private String ExportPublicKeyToPemFormat(TextWriter outputStream)
{
var parameters = CryptoServiceProvider.ExportParameters(false);
using (var stream = new MemoryStream()) {
var writer = new BinaryWriter(stream);
writer.Write((byte)0x30); // SEQUENCE
using (var innerStream = new MemoryStream()) {
var innerWriter = new BinaryWriter(innerStream);
EncodeIntegerBigEndian(innerWriter, new byte[] { 0x00 }); // Version
EncodeIntegerBigEndian(innerWriter, parameters.Modulus);
EncodeIntegerBigEndian(innerWriter, parameters.Exponent);
//All Parameter Must Have Value so Set Other Parameter Value Whit Invalid Data (for keeping Key Structure use "parameters.Exponent" value for invalid data)
EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.D
EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.P
EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.Q
EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.DP
EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.DQ
EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.InverseQ
var length = (int)innerStream.Length;
EncodeLength(writer, length);
writer.Write(innerStream.GetBuffer(), 0, length);
}
var base64 = Convert.ToBase64String(stream.GetBuffer(), 0, (int)stream.Length).ToCharArray();
outputStream.WriteLine("-----BEGIN PUBLIC KEY-----");
// Output as Base64 with lines chopped at 64 characters
for (var i = 0; i < base64.Length; i += 64)
{
outputStream.WriteLine(base64, i, Math.Min(64, base64.Length - i));
}
outputStream.WriteLine("-----END PUBLIC KEY-----");
return(outputStream.ToString());
}
}