private RSAParameters GetParametersOriginal()
{
using (ASNPrivateKeyParser parser = new ASNPrivateKeyParser(this.rawParameters))
{
RSAParameters result = new RSAParameters();
if (!parser.IsNextTag(0x30))
{
throw new InvalidKeyFileException();
}
parser.EnterNextContent();
var versionBytes = parser.GetNext(3);
if (versionBytes.SequenceEqual(new byte[] { 0x02, 0x01, 0x00 }) == false)
{
throw new InvalidKeyFileException();
}
result.Modulus = parser.GetNextContent();
result.Exponent = parser.GetNextContent();
result.D = parser.GetNextContent();
result.P = parser.GetNextContent();
result.Q = parser.GetNextContent();
result.DP = parser.GetNextContent();
result.DQ = parser.GetNextContent();
result.InverseQ = parser.GetNextContent();
return(result);
}
}
private RSAParameters GetParametersAlt()
{
using (ASNPrivateKeyParser parser = new ASNPrivateKeyParser(this.rawParameters))
{
RSAParameters result = new RSAParameters();
// check for wrap sequence
if (!parser.IsNextTag(0x30))
{
throw new InvalidKeyFileException();
}
// enter sequence
parser.EnterNextContent();
// get version bytes
var versionBytes = parser.GetNext(3);
if (versionBytes.SequenceEqual(new byte[] { 0x02, 0x01, 0x00 }) == false)
{
throw new InvalidKeyFileException();
}
// sequence with objectId
if (!parser.IsNextTag(0x30))
{
throw new InvalidKeyFileException();
}
parser.EnterNextContent();
// check for objectId
if (!parser.IsNextTag(0x06))
{
throw new InvalidKeyFileException();
}
var objectIdentifier = parser.GetNextContent();
if (objectIdentifier.SequenceEqual(new byte[] { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01 }) == false)
{
throw new InvalidKeyFileException();
}
var nullBytes = parser.GetNext(2);
if (nullBytes[0] != 0x05 || nullBytes[1] != 0x0)
{
throw new InvalidKeyFileException();
}
if (!parser.IsNextTag(0x04))
{
throw new InvalidKeyFileException();
}
parser.EnterNextContent();
// check for wrap sequence
if (!parser.IsNextTag(0x30))
{
throw new InvalidKeyFileException();
}
// enter sequence
parser.EnterNextContent();
var versionBytes2 = parser.GetNext(3);
if (versionBytes2.SequenceEqual(new byte[] { 0x02, 0x01, 0x00 }) == false)
{
throw new InvalidKeyFileException();
}
result.Modulus = parser.GetNextContent();
result.Exponent = parser.GetNextContent();
result.D = parser.GetNextContent();
result.P = parser.GetNextContent();
result.Q = parser.GetNextContent();
result.DP = parser.GetNextContent();
result.DQ = parser.GetNextContent();
result.InverseQ = parser.GetNextContent();
return(result);
}
}
