rijndaelmanaged

问题 I have an application written in Classic ASP that encrypts data via CAPICOM and stores it in a database. The encryption code looks something like this (Classic ASP, VB. Simplified a bit for brevity): set encryptObject = Server.CreateObject("CAPICOM.EncryptedData") encryptObject.Algorithm.Name = 4 ' 4 is AES encryptObject.Algorithm.KeyLength = ' 0 is MAX encryptObject.SetSecret(sharedSecret) ' sharedSecret was set earlier encryptObject.Content = stringToEncrypt encryptedString = encryptObject

问题 I have problem when I transform a byte[] to a string . I have used these ways so far: System.Text.Encoding.UTF8.GetString(byteArray); System.Text.Encoding.UTF8.GetString(byteArray); I use Rijndael in order to encrypt some parameters to send them in an API and I follow this Microsoft-Documentation. When I encrypt and decrypt as the documentation says everything works fine. In the documentation there is no need for conversion byte[] to a string . But in order to send it to the API I have to put

问题 I have problem when I transform a byte[] to a string . I have used these ways so far: System.Text.Encoding.UTF8.GetString(byteArray); System.Text.Encoding.UTF8.GetString(byteArray); I use Rijndael in order to encrypt some parameters to send them in an API and I follow this Microsoft-Documentation. When I encrypt and decrypt as the documentation says everything works fine. In the documentation there is no need for conversion byte[] to a string . But in order to send it to the API I have to put

问题 I want to implement the most secure, and most reliable form of symmetric key cryptography in my application. The user should input a password to encrypt/decrypt, and that's all. For RijndaelManaged, one must enter a key and an IV. I'm not sure how to address the situation. Right now, I have the entered password being hashed by SHA256 and then being used as the key for the Rijndael. What do I use for the IV? Another password? 回答1: You can use GenerateIV (overridden in RijndaelManaged ) to

问题 I want to implement the most secure, and most reliable form of symmetric key cryptography in my application. The user should input a password to encrypt/decrypt, and that's all. For RijndaelManaged, one must enter a key and an IV. I'm not sure how to address the situation. Right now, I have the entered password being hashed by SHA256 and then being used as the key for the Rijndael. What do I use for the IV? Another password? 回答1: You can use GenerateIV (overridden in RijndaelManaged ) to

问题 I have an encrypted string from one of our customers. This string was encrypted using the AES method in Java. The only thing I have is the key: "xxxxxxxxxxxxxxxxxxxxxxxx" (24 chars) and the encrypted text: "56e84e9f6344826bcfa439cda09e5e96" (32 chars). (This really is the only data I have) I can't seem to find a method to decrypt this string. Could anyone provide me with a working example. 回答1: Here are two complete code samples for you: How To: Encrypt and Decrypt Data Using a Symmetric

问题 I need to communicate from a C# application to another application via encrypted messages in OFB mode. I know that RijndaelManaged does not have support for AES OFB mode. Is there anybody more experienced than me aware of any other way to encrypt/decrypt using OFB mode? 回答1: The following stream implements OFB by using a key stream generated by a zero-fed CBC cipher stream. public class OFBStream : Stream { private const int BLOCKS = 16; private const int EOS = 0; // the goddess of dawn is

问题 The code can be found at: http://pastebin.com/3Yg5bHra My problem is, that when I decrypt then nothing gets returned at all. Nothing gets decrypted. It goes wrong somewhere around line 111-114. The cryptoStream (csDecrypt) is empty, eventhough I put data into the memorystream (msDecrypt) EDIT Nudier came up with a solution 回答1: //Function for encrypting propose static string SymmetricEncryption(string str, byte[] key, byte[] IV) { MemoryStream ms = new MemoryStream(); try { //---creates a new

问题 I would like to limit the length of the encrypted output code like 8 or 10 or 12 character etc. I have created the very small encrypted coed using he "Advanced Encryption Standard (AES)" with Cryptography.SymmetricAlgorithm.IV. But the result of the Encrypted code as example below: Input Password = "090400551" Converted Output = "mkopj3WFb6RZMp34urFLew==" // This should be half the length I want to reduce the length of 8 to 12 character. Any C# cryptography library or algorithm would be fine

问题 Regarding the method... RijndaelManaged.CreateDecryptor Method (Byte[], Byte[]) Here it says about the first parameter... The secret key to be used for the symmetric algorithm. The key size must be 128, 192, or 256 bits. But I can set the key to be any length string... var key = Encoding.UTF8.GetBytes("whetever..."); Why isn't it more fussy about the length of the byte array? And how does it determine which of the three key lengths to be used? 回答1: It isn't true that any key size works. Only