в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:17:57Z

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==PublicKey Cryptography==

<source lang="csharp">using System;
using System.Security.Cryptography;
class Class1
{
static void Main(string[] args)
{
string dataToSign = "this is a test.";
byte[] data_Bytes = System.Text.Encoding.ASCII.GetBytes( dataToSign );

SHA1Managed sha1 = new SHA1Managed();
byte[] hash_Bytes = sha1.ruputeHash( data_Bytes );

DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();
DSASignatureFormatter sigFormatter = new DSASignatureFormatter(dsa);
sigFormatter.SetHashAlgorithm("SHA1");
byte[] signedHash = sigFormatter.CreateSignature( hash_Bytes );
byte[] remote_SignedHash = signedHash;
byte[] remote_HashedValue = hash_Bytes;
DSASignatureDeformatter sigDeformatter = new DSASignatureDeformatter( dsa );
sigDeformatter.SetHashAlgorithm( "SHA1" );
Console.WriteLine(sigDeformatter.VerifySignature( remote_HashedValue, remote_SignedHash ));
RSACryptoServiceProvider rsa= new RSACryptoServiceProvider();
byte[] dataToEncrypt = System.Text.Encoding.Unicode.GetBytes( "Encrypt THIS!" );
byte[] encrypted_Bytes;
byte[] decrypted_Bytes;
encrypted_Bytes = rsa.Encrypt( dataToEncrypt, false );
Console.WriteLine("RSA-encrypted data is {0} bytes long.", encrypted_Bytes.Length);
decrypted_Bytes = rsa.Decrypt( encrypted_Bytes, false );
Console.WriteLine("RSA-decrypted string is {0}.", System.Text.Encoding.Unicode.GetString( decrypted_Bytes ));
}
}</source>

==Secret Key Cryptography: RijndaelManaged==

<source lang="csharp">using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
class Class1
{
static void Main(string[] args)
{
byte[] bin = new byte[100]; // 100 byte buffer
FileStream fsIn = new FileStream("input.txt", FileMode.Open, FileAccess.Read);
long rdLen = 0;
long totLen = fsIn.Length;
int len;
RijndaelManaged rm = new RijndaelManaged();
rm.GenerateIV();
rm.GenerateKey();
FileStream fsOut_RM = new FileStream("outputRM.txt", FileMode.Create, FileAccess.Write);
CryptoStream rmStream = new CryptoStream( fsOut_RM,
rm.CreateEncryptor(), CryptoStreamMode.Write);
while ( rdLen < totLen )
{
len = fsIn.Read(bin, 0, 100);
System.Diagnostics.Debug.WriteLine("Read " + len.ToString() + " bytes.");
rmStream.Write(bin, 0, len );
rdLen += len;
Console.WriteLine("{0} Bytes Read.", rdLen );
}
fsIn.Close();
}
}</source>

==Symmetric Encryption==

<source lang="csharp">using System;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Collections.Generic;
using System.Text;
class Program
{
static void Main(string[] args)
{
RijndaelManaged rmCrypto = new RijndaelManaged();
byte[] key = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16 };
byte[] IV = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16 };
string clearMessage = "this is a test";
FileStream fs = new FileStream("encrypted.dat", FileMode.Create);
CryptoStream cs = new CryptoStream(fs, rmCrypto.CreateEncryptor(key, IV), CryptoStreamMode.Write);
cs.Write(System.Text.ASCIIEncoding.ASCII.GetBytes(clearMessage),0, clearMessage.Length);
cs.Close();
fs.Close();
FileStream fs2 = new FileStream("encrypted.dat", FileMode.Open);
CryptoStream cs2 = new CryptoStream(fs2, rmCrypto.CreateDecryptor(key, IV), CryptoStreamMode.Read);
byte[] decryptedData = new byte[fs2.Length];
cs2.Read(decryptedData, 0, (int)fs2.Length);
cs2.Close();
fs2.Close();
Console.WriteLine(System.Text.ASCIIEncoding.ASCII.GetString(decryptedData));
}
}</source>

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в 15:31, 26 мая 2010

Admin: 1 версия