错误的PKCS7填充错误：无效长度106

我正在尝试使用以下函数进行加密和解密，但是，它会导致填充错误。

如果我将PaddingMode设置为None ，则会在Log中返回一些字母字符和随机符号。

我可能会错过设置正确结构的内容，如下所示：

• Cipher Rijndael（AES）
• 块大小128位（16字节）
• 模式CBC（密码块链接）密钥
• MD5哈希密码
• IV与密钥相同
• 数据编码Base64字符
• UTF-8编码

任何帮助修复此错误以及确保满足上述结构的任何帮助将不胜感激！ 谢谢

错误

 CryptographicException: Bad PKCS7 padding. Invalid length 106. Mono.Security.Cryptography.SymmetricTransform.ThrowBadPaddingException (PaddingMode padding, Int32 length, Int32 position) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/Mono.Security.Cryptography/SymmetricTransform.cs:363) Mono.Security.Cryptography.SymmetricTransform.FinalDecrypt (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/Mono.Security.Cryptography/SymmetricTransform.cs:515) Mono.Security.Cryptography.SymmetricTransform.TransformFinalBlock (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/Mono.Security.Cryptography/SymmetricTransform.cs:554) System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/System.Security.Cryptography/RijndaelManagedTransform.cs:94) APIConnector.Decrypt (System.String toDecrypt) (at Assets/APIConnector.cs:85) 

我的代码

 using UnityEngine; using System; using System.Collections; using System.Collections.Generic; using System.Security.Cryptography; using System.Text; using System.Xml; using System.IO; public class APIConnector : MonoBehaviour { // Use this for initialization void Start () { Debug.Log ("Starting API connector"); } // Update is called once per frame void Update () { } static string data; string firstName=""; string password=""; void OnGUI() { firstName = GUILayout.TextField (firstName, GUILayout.Width(300)); password = GUILayout.TextField (password, GUILayout.Width(300)); if (GUILayout.Button ("Submit")) submit (); } //Our functions void submit(){ Debug.Log ("Name is: " + firstName + " encrypted is: " + Encrypt(firstName)); Debug.Log ("Name is: " + firstName + " decrypted is: " + Decrypt(firstName)); } public static string Encrypt (string toEncrypt) { byte[] keyArray = UTF8Encoding.UTF8.GetBytes ("SecretPassphrase"); // 256-AES key int numBytes = System.Text.Encoding.UTF8.GetBytes(toEncrypt).Length; Debug.Log ("Bytes: " + numBytes); byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes (toEncrypt); RijndaelManaged rDel = new RijndaelManaged (); rDel.Key = keyArray; rDel.BlockSize = 128; rDel.Mode = CipherMode.CBC; // http://msdn.microsoft.com/en-us/library/system.security.cryptography.ciphermode.aspx rDel.Padding = PaddingMode.PKCS7; // better lang support ICryptoTransform cTransform = rDel.CreateEncryptor (); byte[] resultArray = cTransform.TransformFinalBlock (toEncryptArray, 0, toEncryptArray.Length); return Convert.ToBase64String (resultArray, 0, resultArray.Length); } public static string Decrypt (string toDecrypt) { byte[] keyArray = UTF8Encoding.UTF8.GetBytes ("SecretPassphrase"); // AES-256 key byte[] encryptedData = System.Convert.FromBase64String(toDecrypt); //byte[] toEncryptArray = Convert.FromBase64String (toDecrypt); RijndaelManaged rDel = new RijndaelManaged (); rDel.Key = keyArray; rDel.BlockSize = 128; rDel.Mode = CipherMode.CBC; rDel.IV = rDel.Key; // http://msdn.microsoft.com/en-us/library/system.security.cryptography.ciphermode.aspx rDel.Padding = PaddingMode.PKCS7; // better lang support ICryptoTransform cTransform = rDel.CreateDecryptor (); byte[] resultArray = cTransform.TransformFinalBlock (encryptedData, 0, encryptedData.Length); return UTF8Encoding.UTF8.GetString (resultArray); } } 

Answer 1

加密时似乎没有设置IV，因此将自动使用随机IV。 由于您在解密时设置IV（并且它与加密期间使用的不同），因此第一个输出块将损坏。 如果消息足够短（<1块），则填充也将损坏，可能导致此错误。

像往常一样，我会注意到在其他可能的问题中，使用相同的IV作为密钥是不好的做法，因为使用Encoding.UTF8.GetBytes()进行密钥派生。