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Rijndael 메서드를 사용하여 데이터를 암호화하고 해독하려고합니다. 암호를 해독하려고 시도하면 padding is invalid and cannot be removed이 cs.FlushFinalBlock();이고 private static byte[] DecryptString(byte[] cipherData, byte[] Key, byte[] IV) 방법입니다. 나는 심지어 가 중복이 공통 질문 알고있을 패딩이 잘못되어 제거 할 수 없습니다. cs.FlushFinalBlock() 라인에서 오류가 발생합니다
- 처럼 많은 소스를 시도했다. 나는 아침부터 온라인에서 아무런 해결책도 찾지 못했습니다. 다음은 내 코드입니다.
은 대단히 감사합니다 :) PS : 내가//clearText -> the string to be encrypted //passowrd -> encryption key public string EncryptString(string clearText, string Password) { // First we need to turn the input string into a byte array. byte[] clearBytes = Encoding.Unicode.GetBytes(clearText); // Then, we need to turn the password into Key and IV // We are using salt to make it harder to guess our key // using a dictionary attack - // trying to guess a password by enumerating all possible words. var pdb = new PasswordDeriveBytes(Password, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 }); // Now get the key/IV and do the encryption using the // function that accepts byte arrays. // Using PasswordDeriveBytes object we are first getting // 32 bytes for the Key // (the default Rijndael key length is 256bit = 32bytes) // and then 16 bytes for the IV. // IV should always be the block size, which is by default // 16 bytes (128 bit) for Rijndael. // If you are using DES/TripleDES/RC2 the block size is // 8 bytes and so should be the IV size. // You can also read KeySize/BlockSize properties off // the algorithm to find out the sizes. byte[] encryptedData = EncryptString(clearBytes, pdb.GetBytes(32), pdb.GetBytes(16)); // Now we need to turn the resulting byte array into a string. // A common mistake would be to use an Encoding class for that. //It does not work because not all byte values can be // represented by characters. // We are going to be using Base64 encoding that is designed //exactly for what we are trying to do. return Convert.ToBase64String(encryptedData); } //cipherText -> the string to be decrypted //passowrd -> decryption key public string DecryptString(string cipherText, string Password) { // First we need to turn the input string into a byte array. // We presume that Base64 encoding was used byte[] cipherBytes = Convert.FromBase64String(cipherText); // Then, we need to turn the password into Key and IV // We are using salt to make it harder to guess our key // using a dictionary attack - // trying to guess a password by enumerating all possible words. var pdb = new PasswordDeriveBytes(Password, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 }); // Now get the key/IV and do the decryption using // the function that accepts byte arrays. // Using PasswordDeriveBytes object we are first // getting 32 bytes for the Key // (the default Rijndael key length is 256bit = 32bytes) // and then 16 bytes for the IV. // IV should always be the block size, which is by // default 16 bytes (128 bit) for Rijndael. // If you are using DES/TripleDES/RC2 the block size is // 8 bytes and so should be the IV size. // You can also read KeySize/BlockSize properties off // the algorithm to find out the sizes. byte[] decryptedData = DecryptString(cipherBytes, pdb.GetBytes(32), pdb.GetBytes(16)); // Now we need to turn the resulting byte array into a string. // A common mistake would be to use an Encoding class for that. // It does not work // because not all byte values can be represented by characters. // We are going to be using Base64 encoding that is // designed exactly for what we are trying to do. return Encoding.Unicode.GetString(decryptedData); } // Encrypt a byte array into a byte array using a key and an IV private static byte[] EncryptString(byte[] clearData, byte[] Key, byte[] IV) { // Create a MemoryStream to accept the encrypted bytes var ms = new MemoryStream(); // Create a symmetric algorithm. // We are going to use Rijndael because it is strong and // available on all platforms. // You can use other algorithms, to do so substitute the // next line with something like // TripleDES alg = TripleDES.Create(); Rijndael alg = Rijndael.Create(); // Now set the key and the IV. // We need the IV (Initialization Vector) because // the algorithm is operating in its default // mode called CBC (Cipher Block Chaining). // The IV is XORed with the first block (8 byte) // of the data before it is encrypted, and then each // encrypted block is XORed with the // following block of plaintext. // This is done to make encryption more secure. // There is also a mode called ECB which does not need an IV, // but it is much less secure. alg.Key = Key; alg.IV = IV; // Create a CryptoStream through which we are going to be // pumping our data. // CryptoStreamMode.Write means that we are going to be // writing data to the stream and the output will be written // in the MemoryStream we have provided. var cs = new CryptoStream(ms, alg.CreateEncryptor(), CryptoStreamMode.Write); // Write the data and make it do the encryption cs.Write(clearData, 0, clearData.Length); // Close the crypto stream (or do FlushFinalBlock). // This will tell it that we have done our encryption and // there is no more data coming in, // and it is now a good time to apply the padding and // finalize the encryption process. cs.FlushFinalBlock(); // Now get the encrypted data from the MemoryStream. // Some people make a mistake of using GetBuffer() here, // which is not the right way. byte[] encryptedData = ms.ToArray(); return encryptedData; } private static byte[] DecryptString(byte[] cipherData, byte[] Key, byte[] IV) { // Create a MemoryStream that is going to accept the // decrypted bytes var ms = new MemoryStream(); // Create a symmetric algorithm. // We are going to use Rijndael because it is strong and // available on all platforms. // You can use other algorithms, to do so substitute the next // line with something like // TripleDES alg = TripleDES.Create(); Rijndael alg = Rijndael.Create(); // Now set the key and the IV. // We need the IV (Initialization Vector) because the algorithm // is operating in its default // mode called CBC (Cipher Block Chaining). The IV is XORed with // the first block (8 byte) // of the data after it is decrypted, and then each decrypted // block is XORed with the previous // cipher block. This is done to make encryption more secure. // There is also a mode called ECB which does not need an IV, // but it is much less secure. alg.Key = Key; alg.IV = IV; // Create a CryptoStream through which we are going to be // pumping our data. // CryptoStreamMode.Write means that we are going to be // writing data to the stream // and the output will be written in the MemoryStream // we have provided. var cs = new CryptoStream(ms, alg.CreateDecryptor(), CryptoStreamMode.Write); // Write the data and make it do the decryption cs.Write(cipherData, 0, cipherData.Length); // Close the crypto stream (or do FlushFinalBlock). // This will tell it that we have done our decryption // and there is no more data coming in, // and it is now a good time to remove the padding // and finalize the decryption process. cs.FlushFinalBlock(); // Now get the decrypted data from the MemoryStream. // Some people make a mistake of using GetBuffer() here, // which is not the right way. byte[] decryptedData = ms.ToArray(); return decryptedData; }
안녕하세요 고맙습니다. 답장을 보내주세요. 내가 말한 단계를 시도하고 happns (y) 고맙습니다. :) –
안녕하세요, 'PaddingMode.None'을 사용하면 올바른 결과를 얻을 수 있습니다. 하지만 패딩을 사용하여이 작업을 수행하는 방법. 통해 UR 제안, 패딩 그것은 필수 ryt 무엇입니까? –
평문이 전체 바이트 수가 아닌 경우에는 여백이 필요합니다. 암호화와 암호 해독을 위해 패딩을 PKCS7 (또는 PKCS5)에 명시 적으로 설정하십시오. – rossum