如何解密加密文本

How do I decrypt encrypted text?

本文关键字：加密文本 解密 何解密      更新时间：2023-10-16

我找到了允许我加密和解密文本的代码:

cipherData = textBox2->Text;
plainbytes = Encoding::ASCII->GetBytes(cipherData);
plainKey = Encoding::ASCII->GetBytes("0123456789abcdef");
desObj->Key = plainKey;
desObj->Mode = CipherMode::CBC;
desObj->Padding = PaddingMode::PKCS7;
MemoryStream^ ms = gcnew MemoryStream();
CryptoStream^ cs = gcnew CryptoStream(ms,desObj->CreateEncryptor(),CryptoStreamMode::Write);
cs->Write(plainbytes,0,plainbytes->Length);
cs->Close();
chipherbytes = ms->ToArray();
ms->Close();
textBox3->Text = Encoding::ASCII->GetString(chipherbytes);
//decripto
     
MemoryStream^ ms1 = gcnew MemoryStream(chipherbytes);
CryptoStream^ cs1 = gcnew CryptoStream(ms1,desObj->CreateDecryptor(),CryptoStreamMode::Read);
cs1->Read(chipherbytes,0,chipherbytes->Length);
plainbytes2 = ms1->ToArray();
cs1->Close();
ms1->Close();
textBox4->Text = Encoding::ASCII->GetString(plainbytes2);

这是完美的，工作得很好。问题是，我希望解密以前的加密文本，从ASCII开始，而不是从MemoryStream。

我试过这样的代码:

cipherData = textBox2->Text;
plainbytes = Encoding::ASCII->GetBytes(cipherData);
plainKey = Encoding::ASCII->GetBytes("0123456789abcdef");
desObj->Key = plainKey;
desObj->Mode = CipherMode::CBC;
desObj->Padding = PaddingMode::PKCS7;
MemoryStream^ ms = gcnew MemoryStream();
CryptoStream^ cs = gcnew CryptoStream(ms,desObj->CreateEncryptor(),CryptoStreamMode::Write);
cs->Write(plainbytes,0,plainbytes->Length);
cs->Close();
chipherbytes = ms->ToArray();
ms->Close();
textBox3->Text = Encoding::ASCII->GetString(chipherbytes);
//DECRYPTION CODE
     
cipherData = textBox3->Text;
chipherbytes = Encoding::ASCII->GetBytes(cipherData);
     
MemoryStream^ ms1 = gcnew MemoryStream(chipherbytes);
CryptoStream^ cs1 = gcnew CryptoStream(ms1,desObj->CreateDecryptor(),CryptoStreamMode::Read);
cs1->Read(chipherbytes,0,chipherbytes->Length);
plainbytes2 = ms1->ToArray();
cs1->Close();
ms1->Close();
textBox4->Text = Encoding::ASCII->GetString(plainbytes2);

但是当我尝试代码时，我收到这个错误:

类型的未处理异常"System.Security.Cryptography。发生的加密异常mscorlib.dll

附加信息:填充无效，不能删除。

编辑1:

我关闭了换行属性，现在我得到了一个新的错误:

Eccezione non gestita di tipo 'System.Security.Cryptography。mscorlib.dll中的CryptographicException'信息论:Lunghezza dei dati da decrittografare non validate .

(类型为"System.Security.Cryptography"的未处理异常。在mscorlib.dll中发生了CryptographicException' &gt附加信息:要解密的数据长度无效。)

SOLVED

我使用System::Convert::ToBase64String将加密文本正确写入文本框，避免数据丢失;然后我使用System::Convert::FromBase64String

从文本框中加载文本
         //ENCRYPTION CODE
         cipherData = textBox2->Text;
         plainbytes = Encoding::Unicode->GetBytes(cipherData);
         plainKey = Encoding::Unicode->GetBytes("0123456789abcdef");
         desObj->Key = plainKey;
         desObj->Mode = CipherMode::CBC;
         desObj->Padding = PaddingMode::PKCS7;
         MemoryStream^ ms = gcnew MemoryStream();
         CryptoStream^ cs = gcnew CryptoStream(ms,desObj->CreateEncryptor(),CryptoStreamMode::Write);
         cs->Write(plainbytes,0,plainbytes->Length);
         cs->Close();
         chipherbytes = ms->ToArray();
         ms->Close();
         textBox3->Text = System::Convert::ToBase64String(chipherbytes);
         //DECRYPTION CODE

         chipherbytes = System::Convert::FromBase64String(textBox3->Text);
         MemoryStream^ ms1 = gcnew MemoryStream(chipherbytes);
         CryptoStream^ cs1 = gcnew CryptoStream(ms1,desObj->CreateDecryptor(),CryptoStreamMode::Read);
         cs1->Read(chipherbytes,0,chipherbytes->Length);
         plainbytes2 = ms1->ToArray();
         cs1->Close();
         ms1->Close();
         textBox4->Text = Encoding::Unicode->GetString(plainbytes2);
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