MSDN原文http://msdn.microsoft.com/zh-cn/library/system.security.cryptography.descryptoserviceprovider(VS.85).aspx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Runtime.InteropServices;
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namespace ConsoleApplication1
{
class Program
{
// Main method.
public static void Main()
{
// Create a new DES key.
DESCryptoServiceProvider key = new DESCryptoServiceProvider();
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// Encrypt a string to a byte array.
//byte[] buffer = Encrypt("This is some plaintext!", key);
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byte[] buffer = Encrypt("test123ABCD!@#!", key);
// Decrypt the byte array back to a string.
string ss
string plaintext = Decrypt(buffer, key);
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// Display the plaintext value to the console.
Console.WriteLine(plaintext);
}
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// Encrypt the string.
public static byte[] Encrypt(string PlainText, SymmetricAlgorithm key)
{
// Create a memory stream.
MemoryStream ms = new MemoryStream();
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// Create a CryptoStream using the memory stream and the
// CSP DES key.
CryptoStream encStream = new CryptoStream(ms, key.CreateEncryptor(), CryptoStreamMode.Write);
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// Create a StreamWriter to write a string
// to the stream.
StreamWriter sw = new StreamWriter(encStream);
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// Write the plaintext to the stream.
sw.WriteLine(PlainText);
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// Close the StreamWriter and CryptoStream.
sw.Close();
encStream.Close();
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// Get an array of bytes that represents
// the memory stream.
byte[] buffer = ms.ToArray();
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// Close the memory stream.
ms.Close();
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// Return the encrypted byte array.
return buffer;
}
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// Decrypt the byte array.
public static string Decrypt(byte[] CypherText, SymmetricAlgorithm key)
{
// Create a memory stream to the passed buffer.
MemoryStream ms = new MemoryStream(CypherText);
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// Create a CryptoStream using the memory stream and the
// CSP DES key.
CryptoStream encStream = new CryptoStream(ms, key.CreateDecryptor(), CryptoStreamMode.Read);
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// Create a StreamReader for reading the stream.
StreamReader sr = new StreamReader(encStream);
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// Read the stream as a string.
string val = sr.ReadLine();
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// Close the streams.
sr.Close();
encStream.Close();
ms.Close();
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return val;
}
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}
}
顺便把C++的也备份下,明天下了VC++6,温习下MFC。
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顺便把C++的也备份下,明天下了VC++6,温习下MFC。
1
// This sample demonstrates using a key based on the cryptographic service provider (CSP) version
2
// of the Data Encryption Standard (DES)algorithm to encrypt a string to a byte array, and then
3
// to decrypt the byte array back to a string.
4
using namespace System;
5
using namespace System::IO;
6
using namespace System::Text;
7
using namespace System::Security::Cryptography;
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9
// Encrypt the string.
10
array<Byte>^ Encrypt( String^ PlainText, SymmetricAlgorithm^ key )
11
{
12
13
// Create a memory stream.
14
MemoryStream^ ms = gcnew MemoryStream;
15
16
// Create a CryptoStream using the memory stream and the
17
// CSP DES key.
18
CryptoStream^ encStream = gcnew CryptoStream( ms,key->CreateEncryptor(),CryptoStreamMode::Write );
19
20
// Create a StreamWriter to write a string
21
// to the stream.
22
StreamWriter^ sw = gcnew StreamWriter( encStream );
23
24
// Write the plaintext to the stream.
25
sw->WriteLine( PlainText );
26
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// Close the StreamWriter and CryptoStream.
28
sw->Close();
29
encStream->Close();
30
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// Get an array of bytes that represents
32
// the memory stream.
33
array<Byte>^buffer = ms->ToArray();
34
35
// Close the memory stream.
36
ms->Close();
37
38
// Return the encrypted byte array.
39
return buffer;
40
}
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43
// Decrypt the byte array.
44
String^ Decrypt( array<Byte>^CypherText, SymmetricAlgorithm^ key )
45
{
46
47
// Create a memory stream to the passed buffer.
48
MemoryStream^ ms = gcnew MemoryStream( CypherText );
49
50
// Create a CryptoStream using the memory stream and the
51
// CSP DES key.
52
CryptoStream^ encStream = gcnew CryptoStream( ms,key->CreateDecryptor(),CryptoStreamMode::Read );
53
54
// Create a StreamReader for reading the stream.
55
StreamReader^ sr = gcnew StreamReader( encStream );
56
57
// Read the stream as a string.
58
String^ val = sr->ReadLine();
59
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// Close the streams.
61
sr->Close();
62
encStream->Close();
63
ms->Close();
64
return val;
65
}
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67
int main()
68
{
69
70
// Create a new DES key.
71
DESCryptoServiceProvider^ key = gcnew DESCryptoServiceProvider;
72
73
// Encrypt a string to a byte array.
74
array<Byte>^buffer = Encrypt( "This is some plaintext!", key );
75
76
// Decrypt the byte array back to a string.
77
String^ plaintext = Decrypt( buffer, key );
78
79
// Display the plaintext value to the console.
80
Console::WriteLine( plaintext );
81
}
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