public void OpenFile(string file)
{
SuspendLayout();
try
{
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
{
try
{
byte[] pemData = PemReader.ReadPem(fs);
using (MemoryStream ms = new MemoryStream(pemData))
{
rootNode = Asn1.Decode(ms);
}
}
catch (ArgumentException)
{
fs.Position = 0;
rootNode = Asn1.Decode(fs);
}
stsFile.Text = string.Concat("File: ", file);
stsSize.Text = string.Concat("Size: ", fs.Length.ToString(), " bytes");
Text = string.Concat(TitleBase, " - ", file);
}
ShowAsn1(rootNode);
UpdateHexViewerData();
}
catch (Exception ex)
{
MessageBox.Show(this, "Error while opening file: " + ex.Message, "Error opening file", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
}
ResumeLayout();
}
public static RSAParameters DecodeRsaParameters(string pkcs8PrivateKey)
{
const string PrivateKeyPrefix = "-----BEGIN PRIVATE KEY-----";
const string PrivateKeySuffix = "-----END PRIVATE KEY-----";
Utilities.ThrowIfNullOrEmpty(pkcs8PrivateKey, nameof(pkcs8PrivateKey));
pkcs8PrivateKey = pkcs8PrivateKey.Trim();
if (!pkcs8PrivateKey.StartsWith(PrivateKeyPrefix) || !pkcs8PrivateKey.EndsWith(PrivateKeySuffix))
{
throw new ArgumentException(
$"PKCS8 data must be contained within '{PrivateKeyPrefix}' and '{PrivateKeySuffix}'.", nameof(pkcs8PrivateKey));
}
string base64PrivateKey =
pkcs8PrivateKey.Substring(PrivateKeyPrefix.Length, pkcs8PrivateKey.Length - PrivateKeyPrefix.Length - PrivateKeySuffix.Length);
// FromBase64String() ignores whitespace, so further Trim()ing isn't required.
byte[] pkcs8Bytes = Convert.FromBase64String(base64PrivateKey);
object ans1 = Asn1.Decode(pkcs8Bytes);
object[] parameters = (object[])((object[])ans1)[2];
var rsaParmeters = new RSAParameters
{
Modulus = TrimLeadingZeroes((byte[])parameters[1]),
Exponent = TrimLeadingZeroes((byte[])parameters[2], alignTo8Bytes: false),
D = TrimLeadingZeroes((byte[])parameters[3]),
P = TrimLeadingZeroes((byte[])parameters[4]),
Q = TrimLeadingZeroes((byte[])parameters[5]),
DP = TrimLeadingZeroes((byte[])parameters[6]),
DQ = TrimLeadingZeroes((byte[])parameters[7]),
InverseQ = TrimLeadingZeroes((byte[])parameters[8]),
};
return(rsaParmeters);
}