CSharp 中的加密代码类似于 Go 中的代码（AES、CFB、XorKeyStream）
我在 Go 中有加密代码，但在 CSharp 中很难找到类似的代码。我正在讨论如何实现我自己的 XorKeyStream，但有人告诉我，如果我编写自己的加密代码，则存在法律问题。我相信 CSharp 中一定有类似的代码。
package main
import (
"crypto/aes"
"crypto/cipher"
"fmt"
)
func main() {
k1 := []byte("0123456789abcdef")
r1 := []byte("1234567890abcdef")
data := []byte("0123456789")
fmt.Printf("original %x %s\n", data, string(data))
{
block, _ := aes.NewCipher(k1)
stream := cipher.NewCFBEncrypter(block, r1)
stream.XORKeyStream(data, data)
fmt.Printf("crypted %x\n", data)
}
{
block, _ := aes.NewCipher(k1)
stream := cipher.NewCFBDecrypter(block, r1)
stream.XORKeyStream(data, data)
fmt.Printf("decrypted %x %s\n", data, string(data))
}
}
http://play.golang.org/p/EnJ56dYX_-
输出
original 30313233343536373839 0123456789
crypted 762b6dcea9c2a7460db7
decrypted 30313233343536373839 0123456789
PS 有些人将该问题标记为可能与问题重复：“C# AES：加密文件导致“要加密的数据长度无效”。错误”我在 CSharp 中寻找与 Go 中现有代码相同的代码。这个问题是关于填充的。该算法需要将异或文本的“密钥流”。这是不同的问题。
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2回答
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PIPIONE
这是你的代码using System;using System.Text;using System.Security.Cryptography;using System.IO;class AES_CFB_XorKeyStream{ static void Main(string[] args) { byte[] data = Encoding.UTF8.GetBytes("0123456789"); byte [] k1 = Encoding.UTF8.GetBytes("0123456789abcdef"); byte [] r1 = Encoding.UTF8.GetBytes("1234567890abcdef"); Console.WriteLine("original " + BitConverter.ToString(data)); using (RijndaelManaged Aes128 = new RijndaelManaged()) { Aes128.BlockSize = 128; Aes128.KeySize = 128; Aes128.Mode = CipherMode.CFB; Aes128.FeedbackSize = 128; Aes128.Padding = PaddingMode.None; Aes128.Key = k1; Aes128.IV = r1; using (var encryptor = Aes128.CreateEncryptor()) using (var msEncrypt = new MemoryStream()) using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)) using (var bw = new BinaryWriter(csEncrypt, Encoding.UTF8)) { bw.Write(data); bw.Close(); data = msEncrypt.ToArray(); Console.WriteLine("crypted " + BitConverter.ToString(data)); } } using (RijndaelManaged Aes128 = new RijndaelManaged()) { Aes128.BlockSize = 128; Aes128.KeySize = 128; Aes128.Mode = CipherMode.CFB; Aes128.FeedbackSize = 128; Aes128.Padding = PaddingMode.None; Aes128.Key = k1; Aes128.IV = r1; using (var decryptor = Aes128.CreateDecryptor()) using (var msEncrypt = new MemoryStream()) using (var csEncrypt = new CryptoStream(msEncrypt, decryptor, CryptoStreamMode.Write)) using (var bw = new BinaryWriter(csEncrypt, Encoding.UTF8)) { bw.Write(data); bw.Close(); data = msEncrypt.ToArray(); Console.WriteLine("decrypted " + BitConverter.ToString(data)); } } }}输出original 30-31-32-33-34-35-36-37-38-39crypted 76-2B-6D-CE-A9-C2-A7-46-0D-B7decrypted 30-31-32-33-34-35-36-37-38-39 -
千万里不及你
我遇到了完全相同的问题，只有每个解密块的第一个字节是正确的，但我没有能够在 Go 程序上更改源代码的奢侈。我最终实现了自己的填充。只需用 0 字节填充加密字节，使其可被 128 的块大小整除，然后在运行解密例程后，从末尾切掉该字节数。示例代码：using System;using System.Text;using System.Security.Cryptography;using System.Linq;public static class Program{ static RijndaelManaged aes = new RijndaelManaged(){ Mode = CipherMode.CFB, BlockSize = 128, KeySize = 128, FeedbackSize = 128, Padding = PaddingMode.None }; public static void Main(){ byte[] key = Encoding.UTF8.GetBytes("0123456789abcdef"); byte[] iv = Encoding.UTF8.GetBytes("1234567890abcdef"); byte[] encryptedBytes = new byte[]{0x76, 0x2b, 0x6d, 0xce, 0xa9, 0xc2, 0xa7, 0x46, 0x0d, 0xb7}; // Custom pad the bytes int padded; encryptedBytes = PadBytes(encryptedBytes, aes.BlockSize, out padded); // Decrypt bytes byte[] decryptedBytes = DecryptBytesAES(encryptedBytes, key, iv, encryptedBytes.Length); // Check for successful decrypt if(decryptedBytes != null){ // Unpad decryptedBytes = UnpadBytes(decryptedBytes, padded); Console.Write("Decrypted: " + Encoding.UTF8.GetString(decryptedBytes)); } } // Just an elegant way of initializing an array with bytes public static byte[] Initialize(this byte[] array, byte value, int length) { for (int i = 0; i < array.Length; i++) { array[i] = value; } return array; } // Custom padding to get around the issue of how Go uses CFB mode without padding differently than C# public static byte[] PadBytes(byte[] encryptedBytes, int blockSize, out int numPadded) { numPadded = 0; // Check modulus of block size int mod = encryptedBytes.Length % blockSize; if (mod != 0) { // Calculate number to pad numPadded = blockSize - mod; // Build array return encryptedBytes.Concat(new byte[numPadded].Initialize(0, numPadded)).ToArray(); } else { // No padding needed return encryptedBytes; } } public static byte[] UnpadBytes(byte[] decryptedBytes, int numPadded) { if(numPadded != 0) { byte[] unpaddedBytes = new byte[decryptedBytes.Length - numPadded]; Array.Copy(decryptedBytes, unpaddedBytes, unpaddedBytes.Length); return unpaddedBytes; } else { return decryptedBytes; } } public static byte[] DecryptBytesAES(byte[] cipherText, byte[] Key, byte[] IV, int size) { byte[] array = new byte[size]; try{ aes.Key = Key; aes.IV = IV; ICryptoTransform transform = aes.CreateDecryptor(aes.Key, aes.IV); using (System.IO.MemoryStream memoryStream = new System.IO.MemoryStream(cipherText)) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream, transform, CryptoStreamMode.Read)) { cryptoStream.Read(array, 0, size); } } } catch(Exception e){ return null; } return array; }}.NET 小提琴：https : //dotnetfiddle.net/NPHKN3
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