/*文章 -> Session Key(對稱式) - > 文章加密 - - - - - -> 加密後的文章
* -> Session Key(對稱式) - > 公鑰(對方)加密 - - -> 加密後的Session Key
*/
//內部的實作參照官方範例
private static void EncryptFile(
Stream outputStream, //加密後輸出檔案之資料流
string fileName, //欲加密檔案名稱位置
PgpPublicKey encKey, //接收方的公鑰(對方)
bool armor,
bool withIntegrityCheck /*完整性檢查*/)
{
if (armor)
{
outputStream = new ArmoredOutputStream(outputStream); //位置、headers、雜湊表
}
try
{
byte[] bytes = PgpExampleUtilities.CompressFile(fileName, CompressionAlgorithmTag.Zip); //資料壓縮一個檔案
PgpEncryptedDataGenerator encGen = new PgpEncryptedDataGenerator(
SymmetricKeyAlgorithmTag.Cast5, withIntegrityCheck, new SecureRandom()); //隨機產生Session Key(對稱-Cast5)
encGen.AddMethod(encKey);
Stream cOut = encGen.Open(outputStream, bytes.Length); //建立 todo 注意，RSA非對稱加密，公鑰加密私鑰解密，預設為SHA1，但可選擇 SHA256雜湊
cOut.Write(bytes, 0, bytes.Length); //加密及寫入
cOut.Close();
if (armor)
{
outputStream.Close();
outputStream.Dispose();
}
}
catch (PgpException e)
{
Console.Error.WriteLine(e);
Exception underlyingException = e.InnerException;
if (underlyingException != null)
{
Console.Error.WriteLine(underlyingException.Message);
Console.Error.WriteLine(underlyingException.StackTrace);
}
}
}
//內部的實作參照官方範例
private static void EncryptFile(
Stream outputStream,
string fileName,
PgpPublicKey encKey,
bool armor,
bool withIntegrityCheck)
{
if (armor)
{
outputStream = new ArmoredOutputStream(outputStream);
}
try
{
byte[] bytes = PgpExampleUtilities.CompressFile(fileName, CompressionAlgorithmTag.Zip);
PgpEncryptedDataGenerator encGen = new PgpEncryptedDataGenerator(
SymmetricKeyAlgorithmTag.Cast5, withIntegrityCheck, new SecureRandom());
encGen.AddMethod(encKey);
Stream cOut = encGen.Open(outputStream, bytes.Length);
cOut.Write(bytes, 0, bytes.Length);
cOut.Close();
if (armor)
{
outputStream.Close();
}
}
catch (PgpException e)
{
Console.Error.WriteLine(e);
Exception underlyingException = e.InnerException;
if (underlyingException != null)
{
Console.Error.WriteLine(underlyingException.Message);
Console.Error.WriteLine(underlyingException.StackTrace);
}
}
}
