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分享DES加密不一致问题,求大神解决
各位大神
小弟在做一个文件传输项目
对方系统用的是c#写的des加解密算法
密钥：Bank2014
加密偏移量：Bank2014
加密模式:CipherMode.CBC、PaddingMode.PKCS5
块长度:64
文件编码：GBK
小弟这边用的是c写的加解密算法我就只设置了密钥:Bank2014
代码是参照大赛写的 位置在:http://www.iteye.com/topic/478024
目前的问题就是对方公司加密出来的文件跟我加密出来的文件不一样
我的代码是否需要设置加密偏移量呢 还是代码本身就有问题
求大神指点 先跪谢了
小弟在做一个文件传输项目
对方系统用的是c#写的des加解密算法
密钥：Bank2014
加密偏移量：Bank2014
加密模式:CipherMode.CBC、PaddingMode.PKCS5
块长度:64
文件编码：GBK
小弟这边用的是c写的加解密算法我就只设置了密钥:Bank2014
代码是参照大赛写的 位置在:http://www.iteye.com/topic/478024
目前的问题就是对方公司加密出来的文件跟我加密出来的文件不一样
我的代码是否需要设置加密偏移量呢 还是代码本身就有问题
求大神指点 先跪谢了
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赵4老师 2014-03-28
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using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
private byte[] Keys = { 0xEF, 0xAB, 0x56, 0x78, 0x90, 0x34, 0xCD, 0x12 };//默认密钥向量
/// <summary>
/// DES加密字符串
/// </summary>
/// <param name="encryptString">待加密的字符串</param>
/// <param name="encryptKey">加密密钥,要求为8位</param>
/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
public string EncryptDES(string encryptString, string encryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
catch
{
return encryptString;
}
}
/// <summary>
/// DES解密字符串
/// </summary>
/// <param name="decryptString">待解密的字符串</param>
/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
/// <returns>解密成功返回解密后的字符串，失败返源串</returns>
public string DecryptDES(string decryptString, string decryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
}
}
/// <summary>
/// use sha1 to encrypt string
/// </summary>
public string SHA1_Encrypt(string Source_String)
{
byte[] StrRes = Encoding.Default.GetBytes(Source_String);
HashAlgorithm iSHA = new SHA1CryptoServiceProvider();
StrRes = iSHA.ComputeHash(StrRes);
StringBuilder EnText = new StringBuilder();
foreach (byte iByte in StrRes)
{
EnText.AppendFormat("{0:x2}", iByte);
}
return EnText.ToString();
}
namespace Microsoft.Samples.Security.PublicKey
{
class App
{
// Main entry point
static void Main(string[] args)
{
// Instantiate 3 People for example. See the Person class below
Person alice = new Person("Alice");
Person bob = new Person("Bob");
Person steve = new Person("Steve");
// Messages that will exchanged. See CipherMessage class below
CipherMessage aliceMessage;
CipherMessage bobMessage;
CipherMessage steveMessage;
// Example of encrypting/decrypting your own message
Console.WriteLine("Encrypting/Decrypting Your Own Message");
Console.WriteLine("-----------------------------------------");
// Alice encrypts a message using her own public key
aliceMessage = alice.EncryptMessage("Alice wrote this message");
// then using her private key can decrypt the message
alice.DecryptMessage(aliceMessage);
// Example of Exchanging Keys and Messages
Console.WriteLine();
Console.WriteLine("Exchanging Keys and Messages");
Console.WriteLine("-----------------------------------------");
// Alice Sends a copy of her public key to Bob and Steve
bob.GetPublicKey(alice);
steve.GetPublicKey(alice);
// Bob and Steve both encrypt messages to send to Alice
bobMessage = bob.EncryptMessage("Hi Alice! - Bob.");
steveMessage = steve.EncryptMessage("How are you? - Steve");
// Alice can decrypt and read both messages
alice.DecryptMessage(bobMessage);
alice.DecryptMessage(steveMessage);
Console.WriteLine();
Console.WriteLine("Private Key required to read the messages");
Console.WriteLine("-----------------------------------------");
// Steve cannot read the message that Bob encrypted
steve.DecryptMessage(bobMessage);
// Not even Bob can use the Message he encrypted for Alice.
// The RSA private key is required to decrypt the RS2 key used
// in the decryption.
bob.DecryptMessage(bobMessage);
} // method Main
} // class App
class CipherMessage
{
public byte[] cipherBytes; // RC2 encrypted message text
public byte[] rc2Key; // RSA encrypted rc2 key
public byte[] rc2IV; // RC2 initialization vector
}
class Person
{
private RSACryptoServiceProvider rsa;
private RC2CryptoServiceProvider rc2;
private string name;
// Maximum key size for the RC2 algorithm
const int keySize = 128;
// Person constructor
public Person(string p_Name)
{
rsa = new RSACryptoServiceProvider();
rc2 = new RC2CryptoServiceProvider();
rc2.KeySize = keySize;
name = p_Name;
}
// Used to send the rsa public key parameters
public RSAParameters SendPublicKey()
{
RSAParameters result = new RSAParameters();
try
{
result = rsa.ExportParameters(false);
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
}
return result;
}
// Used to import the rsa public key parameters
public void GetPublicKey(Person receiver)
{
try
{
rsa.ImportParameters(receiver.SendPublicKey());
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
}
}
public CipherMessage EncryptMessage(string text)
{
// Convert string to a byte array
CipherMessage message = new CipherMessage();
byte[] plainBytes = Encoding.Unicode.GetBytes(text.ToCharArray());
// A new key and iv are generated for every message
rc2.GenerateKey();
rc2.GenerateIV();
// The rc2 initialization doesnt need to be encrypted, but will
// be used in conjunction with the key to decrypt the message.
message.rc2IV = rc2.IV;
try
{
// Encrypt the RC2 key using RSA encryption
message.rc2Key = rsa.Encrypt(rc2.Key, false);
}
catch (CryptographicException e)
{
// The High Encryption Pack is required to run this sample
// because we are using a 128-bit key. See the readme for
// additional information.
Console.WriteLine("Encryption Failed. Ensure that the" +
" High Encryption Pack is installed.");
Console.WriteLine("Error Message: " + e.Message);
Environment.Exit(0);
}
// Encrypt the Text Message using RC2 (Symmetric algorithm)
ICryptoTransform sse = rc2.CreateEncryptor();
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, sse, CryptoStreamMode.Write);
try
{
cs.Write(plainBytes, 0, plainBytes.Length);
cs.FlushFinalBlock();
message.cipherBytes = ms.ToArray();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
ms.Close();
cs.Close();
}
return message;
} // method EncryptMessage
public void DecryptMessage(CipherMessage message)
{
// Get the RC2 Key and Initialization Vector
rc2.IV = message.rc2IV;
try
{
// Try decrypting the rc2 key
rc2.Key = rsa.Decrypt(message.rc2Key, false);
}
catch (CryptographicException e)
{
Console.WriteLine("Decryption Failed: " + e.Message);
return;
}
ICryptoTransform ssd = rc2.CreateDecryptor();
// Put the encrypted message in a memorystream
MemoryStream ms = new MemoryStream(message.cipherBytes);
// the CryptoStream will read cipher text from the MemoryStream
CryptoStream cs = new CryptoStream(ms, ssd, CryptoStreamMode.Read);
byte[] initialText = new Byte[message.cipherBytes.Length];
try
{
// Decrypt the message and store in byte array
cs.Read(initialText, 0, initialText.Length);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
ms.Close();
cs.Close();
}
// Display the message received
Console.WriteLine(name + " received the following message:");
Console.WriteLine(" " + Encoding.Unicode.GetString(initialText));
} // method DecryptMessage
} // class Person
} // namespace PublicKey
赵4老师 2014-03-28
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参考《算法精解C语言实现》例子代码\examples_pc\source\des.c ？
N_Sev7 2014-03-28
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没接触过相关知识，
仅有的记忆是大学的网络安全课上
老师讲过的RSA加密算法，而且
也已经忘记了，爱莫能助
乔木3124343 2014-03-27
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哎 不懂这原理就是悲催啊 谢谢哈[/quote]
毕竟不是信息安全专业～～可以理解。
不过我记得密码学上面有介绍这种算法，是经过什么什么列变化，什么什么做的。可以找个学安全的人问问就懂了～。[/quote]
行 我再去找找他们看有没懂的 
水平不流 2014-03-27
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哎 不懂这原理就是悲催啊 谢谢哈[/quote]
毕竟不是信息安全专业～～可以理解。
不过我记得密码学上面有介绍这种算法，是经过什么什么列变化，什么什么做的。可以找个学安全的人问问就懂了～。
乔木3124343 2014-03-27
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哎 不懂这原理就是悲催啊 谢谢哈
水平不流 2014-03-27
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C#有这种内置加解密算法。 不过C语言没做过。不知道这种问题是不是因为字符编码的问题，中文有好多种编码，也是烦的不行。帮你顶顶～～
乔木3124343 2014-03-27
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DES_Encrypt("1.txt","Bank2014","2.txt");
小弟是这样调用的
