/*.......................................................................數位簽章開始*/
private static void SignFile(
string fileName, //欲作簽章的檔案名稱及位置
Stream keyIn, // Private key 的 File Stream
Stream outputStream, //簽章後的檔案 File Stream
char[] pass, // private Key 的 password
bool armor, //用途不明?? 範例預設true
bool compress //用途不明?? 範例預設true
)
{
if (armor)
{
outputStream = new ArmoredOutputStream(outputStream);
}
PgpSecretKey pgpSec = PgpExampleUtilities.ReadSecretKey(keyIn);
PgpPrivateKey pgpPrivKey = pgpSec.ExtractPrivateKey(pass);
PgpSignatureGenerator sGen = new PgpSignatureGenerator(pgpSec.PublicKey.Algorithm, HashAlgorithmTag.Sha256);
sGen.InitSign(PgpSignature.BinaryDocument, pgpPrivKey);
foreach (string userId in pgpSec.PublicKey.GetUserIds())
{
PgpSignatureSubpacketGenerator spGen = new PgpSignatureSubpacketGenerator();
spGen.SetSignerUserId(false, userId);
sGen.SetHashedSubpackets(spGen.Generate());
// Just the first one!
break;
}
Stream cOut = outputStream;
PgpCompressedDataGenerator cGen = null;
if (compress)
{
cGen = new PgpCompressedDataGenerator(CompressionAlgorithmTag.ZLib);
cOut = cGen.Open(cOut);
}
BcpgOutputStream bOut = new BcpgOutputStream(cOut);
sGen.GenerateOnePassVersion(false).Encode(bOut);
FileInfo file = new FileInfo(fileName);
PgpLiteralDataGenerator lGen = new PgpLiteralDataGenerator();
Stream lOut = lGen.Open(bOut, PgpLiteralData.Binary, file);
FileStream fIn = file.OpenRead();
int ch = 0;
while ((ch = fIn.ReadByte()) >= 0)
{
lOut.WriteByte((byte)ch);
sGen.Update((byte)ch);
}
fIn.Close();
lGen.Close();
sGen.Generate().Encode(bOut);
if (cGen != null)
{
cGen.Close();
}
if (armor)
{
outputStream.Close();
}
}
/*.......................................................................加密開始*/
/*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
*/
//外部呼叫的 method
public static void EncryptFile(
string outputFileName, //加密後輸出檔案名稱位置
string inputFileName, //欲加密檔案名稱位置
string encKeyFileName, //提供加密的 public key(接收方的) 檔名及位置
bool armor, //盔甲??，範例預設為true
bool withIntegrityCheck //完整性檢查，範例預設為false
)
{
PgpPublicKey encKey = PgpExampleUtilities.ReadPublicKey(encKeyFileName); //find encryption key
using (Stream output = File.Create(outputFileName))
{
EncryptFile(output, inputFileName, encKey, armor, withIntegrityCheck);
}
}
/*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);
}
}
}
/*
* 文章 -> hash -> 私鑰(自己)簽章 -> 簽章後的hash值
* 文章 - - - - - - - - - - - - - -> 文章
*/
/*.......................................................................數位簽章開始*/
private static void SignFile(
string fileName, //預計數位簽章原始檔案的完整路徑
Stream keyIn, // Private key 的 File Stream (自己)
Stream outputStream, //預計匯出(數位簽章後) File Stream
char[] pass, // private Key 的 password
bool armor, //盔甲??? 範例預設true
bool compress //解壓縮 範例預設true
)
{
if (armor)
{
outputStream = new ArmoredOutputStream(outputStream); //匯出位置、headers、雜湊表
}
PgpSecretKey pgpSec = PgpExampleUtilities.ReadSecretKey(keyIn); //PgpSecretKey包含私鑰及公鑰整個物件
PgpPrivateKey pgpPrivKey = pgpSec.ExtractPrivateKey(pass); //需輸入私鑰密碼才能取出私鑰
/*
* SHA是由美國國家安全局制定，主要應用於數字簽名標準裡面的數字簽名算法( DSA : Digital Signature Algorithm )，
* SHA家族中以SHA1和SHA256最為廣泛使用。SHA1的雜湊值長度為160bit、SHA256則為256bit，長度越長碰撞的機會就越低也越安全，
* 但同時計算的時間複雜度也隨著增高。
*/
PgpSignatureGenerator sGen = new PgpSignatureGenerator(pgpSec.PublicKey.Algorithm, HashAlgorithmTag.Sha256); //PublicKey.Algorithm即原始公鑰
sGen.InitSign(PgpSignature.BinaryDocument, pgpPrivKey); //若沒私鑰重新生產一個
foreach (string userId in pgpSec.PublicKey.GetUserIds()) //ExportKeyPair 的 identity (MarkWu)
{
PgpSignatureSubpacketGenerator spGen = new PgpSignatureSubpacketGenerator();
spGen.SetSignerUserId(false, userId); //數位簽章的使用者
sGen.SetHashedSubpackets(spGen.Generate()); //將 SignatureSubpacket 陣列化再回傳
// Just the first one!
break;
}
Stream cOut = outputStream;
PgpCompressedDataGenerator cGen = null;
if (compress) //解壓縮
{
cGen = new PgpCompressedDataGenerator(CompressionAlgorithmTag.ZLib);
cOut = cGen.Open(cOut);
}
BcpgOutputStream bOut = new BcpgOutputStream(cOut);
sGen.GenerateOnePassVersion(false).Encode(bOut); //hash 加密
FileInfo file = new FileInfo(fileName);
PgpLiteralDataGenerator lGen = new PgpLiteralDataGenerator();
Stream lOut = lGen.Open(bOut, PgpLiteralData.Binary, file);
FileStream fIn = file.OpenRead();
int ch = 0;
while ((ch = fIn.ReadByte()) >= 0) //從資料流讀取一個位元組
{
lOut.WriteByte((byte)ch); //寫入預計匯出檔案
sGen.Update((byte)ch); //進行加密?
}
fIn.Close();
lGen.Close();
sGen.Generate().Encode(bOut);
if (cGen != null)
{
cGen.Close();
}
if (armor)
{
outputStream.Close();
}
}
/*
* 加密後的Session Key -> 私鑰(自己)解密 -> Session Key(對稱式)
* 加密後的文章 - - - - - - - - - - - - - > Session Key(對稱式) -> 解密後的文章
*/
private static void DecryptFile(
Stream inputStream, //欲解密之檔案之串流
Stream keyIn, //私鑰之串流
char[] passwd, //私鑰密碼
string defaultFileName //解密後檔案名稱及位置
)
{
inputStream = PgpUtilities.GetDecoderStream(inputStream); //資料流陣列化 byte Array
try
{
PgpObjectFactory pgpF = new PgpObjectFactory(inputStream);
PgpEncryptedDataList enc;
PgpObject o = pgpF.NextPgpObject();
//
// the first object might be a PGP marker packet.
//
if (o is PgpEncryptedDataList)
{
enc = (PgpEncryptedDataList)o;
}
else
{
enc = (PgpEncryptedDataList)pgpF.NextPgpObject();
}
//
// find the Secret Key
//
PgpPrivateKey sKey = null;
PgpPublicKeyEncryptedData pbe = null;
PgpSecretKeyRingBundle pgpSec = new PgpSecretKeyRingBundle(
PgpUtilities.GetDecoderStream(keyIn)); //new 密鑰捆包 物件
foreach (PgpPublicKeyEncryptedData pked in enc.GetEncryptedDataObjects())
{
sKey = PgpExampleUtilities.FindSecretKey(pgpSec, pked.KeyId, passwd); //(密鑰捆包,identify,私鑰密碼)，抓對稱加密的密鑰，密鑰
if (sKey != null)
{
pbe = pked;
break;
}
}
if (sKey == null)
{
throw new ArgumentException("secret key for message not found.");
}
Stream clear = pbe.GetDataStream(sKey); //解碼
PgpObjectFactory plainFact = new PgpObjectFactory(clear); // BcpgInputStream
PgpObject message = plainFact.NextPgpObject(); //取出
if (message is PgpCompressedData)
{
PgpCompressedData cData = (PgpCompressedData)message;
PgpObjectFactory pgpFact = new PgpObjectFactory(cData.GetDataStream());
message = pgpFact.NextPgpObject(); //解壓縮
}
if (message is PgpLiteralData)
{
PgpLiteralData ld = (PgpLiteralData)message; //內容
string outFileName = ld.FileName;
//if (outFileName.Length == 0)
//{
outFileName = defaultFileName;
//}
Stream fOut = File.Create(outFileName);
Stream unc = ld.GetInputStream();
Streams.PipeAll(unc, fOut); //Pipe一種傳輸方式，存入匯出檔案
fOut.Close();
fOut.Dispose();
}
else if (message is PgpOnePassSignatureList)
{
throw new PgpException("encrypted message contains a signed message - not literal data.");
}
else
{
throw new PgpException("message is not a simple encrypted file - type unknown.");
}
if (pbe.IsIntegrityProtected())
{
if (!pbe.Verify())
{
Console.Error.WriteLine("message failed integrity check");
}
else
{
Console.Error.WriteLine("message integrity check passed");
}
}
else
{
Console.Error.WriteLine("no message integrity check");
}
}
catch (PgpException e)
{
Console.Error.WriteLine(e);
Exception underlyingException = e.InnerException;
if (underlyingException != null)
{
Console.Error.WriteLine(underlyingException.Message);
Console.Error.WriteLine(underlyingException.StackTrace);
}
}
}
