public string decryptMessage(string messageEncrypted, X509Certificate2 privateCert)
{
string clearMessage;
try
{
My2C2P.Org.BouncyCastle.Crypto.AsymmetricKeyParameter key = My2C2P.Org.BouncyCastle.Security.DotNetUtilities.GetKeyPair(privateCert.PrivateKey).Private;
var x509Certificate = My2C2P.Org.BouncyCastle.Security.DotNetUtilities.FromX509Certificate(privateCert);
byte[] decBytes = new My2C2P.Org.BouncyCastle.Cms.CmsEnvelopedData(messageEncrypted.FromBase64String()).GetRecipientInfos().GetFirstRecipient(new My2C2P.Org.BouncyCastle.Cms.RecipientID()
{
SerialNumber = x509Certificate.SerialNumber,
Issuer = x509Certificate.IssuerDN
}).GetContent(key);
clearMessage = decBytes.GetClearString();
}
catch (Exception exception)
{
if (exception.Message.Contains("key not valid for use in specified state"))
{
clearMessage = "private key required to mark as exportable";
}
else
{
clearMessage = exception.ToString();
}
}
return(clearMessage);
}
public byte[] decryptMessage(byte[] encodedEnvelopedCms, X509Certificate2 privateCert)
{
byte[] content;
try
{
My2C2P.Org.BouncyCastle.Crypto.AsymmetricKeyParameter key = My2C2P.Org.BouncyCastle.Security.DotNetUtilities.GetKeyPair(privateCert.PrivateKey).Private;
var x509Certificate = My2C2P.Org.BouncyCastle.Security.DotNetUtilities.FromX509Certificate(privateCert);
content = new My2C2P.Org.BouncyCastle.Cms.CmsEnvelopedData(encodedEnvelopedCms).GetRecipientInfos().GetFirstRecipient(new My2C2P.Org.BouncyCastle.Cms.RecipientID()
{
SerialNumber = x509Certificate.SerialNumber,
Issuer = x509Certificate.IssuerDN
}).GetContent(key);
}
catch (Exception exception)
{
content = null;
}
return(content);
}
