/// <summary>
/// Encrypt to enveloped cms encryptes txt using x509 certificate
/// </summary>
/// <param name="msgToEncrypt"></param>
/// <returns></returns>
public string Encrypt(string msgToEncrypt)
{
// Validate the msg to be encrypted
if (string.IsNullOrEmpty(msgToEncrypt))
{
DynamoDBTracer.Tracer.Write("Message to encrypt is null or empty");
throw new ArgumentException(string.Format("Message to encrypt is null or empty"));
}
// Validate the certificate
if (this.RecipientCert == null)
{
DynamoDBTracer.Tracer.Write("Recipient certificate for encrytion is null");
throw new ArgumentException(string.Format(
"Recipient certificate for encrytion"));
}
// Convert message to an array of Unicode bytes for signing.
UnicodeEncoding unicode = new UnicodeEncoding();
byte[] msgBytes = unicode.GetBytes(msgToEncrypt);
// Encrypt using the certificate
byte[] encodedEnvelopedCms = EncryptMsg(msgBytes, this.RecipientCert);
string encodedMessage = EncryptionUtilities.ConvertToHexString(encodedEnvelopedCms);
return(encodedMessage);
}
/// <summary>
/// Decrypts the enveloped encrypted message by selecting the correct certificate from My store
/// </summary>
/// <param name="msgToEncrypt"></param>
/// <returns></returns>
public string Decrypt(string msgToDecrypt)
{
if (string.IsNullOrEmpty(msgToDecrypt))
{
DynamoDBTracer.Tracer.Write("Message to decrypt is null or empty");
throw new ArgumentException(string.Format(
"Message to decrypt={0} is null or empty", msgToDecrypt));
}
// Convert message to an array of bytes.
byte[] encodedEnvelopedCms = EncryptionUtilities.ConvertHexStringToByteArray(msgToDecrypt);
// Decrypt by reading certificate from My certificate store
byte[] decryptedMsgBytes = DecryptMsg(encodedEnvelopedCms, false);
// Convert the byte array to string
UnicodeEncoding unicode = new UnicodeEncoding();
string decryptedMsg = unicode.GetString(decryptedMsgBytes);
return(decryptedMsg);
}