public string Descriptografar(string criptografia)
{
// Cria objeto para criptografia
System.Security.Cryptography.TripleDES des = System.Security.Cryptography.TripleDES.Create();
des.Mode = System.Security.Cryptography.CipherMode.CBC;
des.KeySize = 192;
byte[] chaveBytes;
byte[] criptografiaBytes;
byte[] mensagemBytes;
string mensagem;
// Transforma chave e mensagem em array de byts
chaveBytes = Encoding.UTF8.GetBytes("chavede16digitos");
mensagemBytes = Convert.FromBase64String(criptografia);
// Realiza criptografia
System.Security.Cryptography.ICryptoTransform cryptor = des.CreateDecryptor(chaveBytes, chaveBytes);
criptografiaBytes = cryptor.TransformFinalBlock(mensagemBytes, 0, mensagemBytes.Length);
cryptor.Dispose();
// Transforma criptografia em string
mensagem = Encoding.UTF8.GetString(criptografiaBytes);
return(mensagem);
}
// http://www.codeproject.com/KB/aspnet/ASPNET_20_Webconfig.aspx
// http://www.codeproject.com/KB/database/Connection_Strings.aspx
public static string DeCrypt(string SourceText)
{
string strReturnValue = "";
if (string.IsNullOrEmpty(SourceText))
{
return(strReturnValue);
} // End if (string.IsNullOrEmpty(SourceText))
using (System.Security.Cryptography.TripleDES des3 = System.Security.Cryptography.TripleDES.Create())
{
using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
{
des3.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strSymmetricKey));
des3.Mode = System.Security.Cryptography.CipherMode.ECB;
System.Security.Cryptography.ICryptoTransform desdencrypt = des3.CreateDecryptor();
byte[] buff = System.Convert.FromBase64String(SourceText);
strReturnValue = System.Text.Encoding.UTF8.GetString(desdencrypt.TransformFinalBlock(buff, 0, buff.Length));
} // End Using md5
} // End Using des3
return(strReturnValue);
} // End Function DeCrypt
public override void init(int mode, byte[] key, byte[] iv)
{
triDes = new System.Security.Cryptography.TripleDESCryptoServiceProvider();
triDes.Mode = System.Security.Cryptography.CipherMode.CBC;
triDes.Padding = System.Security.Cryptography.PaddingMode.None;
//String pad="NoPadding";
//if(padding) pad="PKCS5Padding";
byte[] tmp;
if (iv.Length > ivsize)
{
tmp = new byte[ivsize];
Array.Copy(iv, 0, tmp, 0, tmp.Length);
iv = tmp;
}
if (key.Length > bsize)
{
tmp = new byte[bsize];
Array.Copy(key, 0, tmp, 0, tmp.Length);
key = tmp;
}
try
{
// cipher=javax.crypto.Cipher.getInstance("DESede/CBC/"+pad);
/*
* // The following code does not work on IBM's JDK 1.4.1
* SecretKeySpec skeySpec = new SecretKeySpec(key, "DESede");
* cipher.init((mode==ENCRYPT_MODE?
* javax.crypto.Cipher.ENCRYPT_MODE:
* javax.crypto.Cipher.DECRYPT_MODE),
* skeySpec, new IvParameterSpec(iv));
*/
// DESedeKeySpec keyspec=new DESedeKeySpec(key);
// SecretKeyFactory keyfactory=SecretKeyFactory.getInstance("DESede");
// SecretKey _key=keyfactory.generateSecret(keyspec);
// cipher.init((mode==ENCRYPT_MODE?
// javax.crypto.Cipher.ENCRYPT_MODE:
// javax.crypto.Cipher.DECRYPT_MODE),
// _key, new IvParameterSpec(iv));
cipher = (mode == ENCRYPT_MODE?
triDes.CreateEncryptor(key, iv):
triDes.CreateDecryptor(key, iv));
}
catch (Exception e)
{
Console.WriteLine(e);
cipher = null;
}
}
public override void init(int mode, byte[] key, byte[] iv)
{
triDes = new System.Security.Cryptography.TripleDESCryptoServiceProvider();
triDes.Mode=System.Security.Cryptography.CipherMode.CBC;
triDes.Padding=System.Security.Cryptography.PaddingMode.None;
//String pad="NoPadding";
//if(padding) pad="PKCS5Padding";
byte[] tmp;
if(iv.Length>ivsize)
{
tmp=new byte[ivsize];
Array.Copy(iv, 0, tmp, 0, tmp.Length);
iv=tmp;
}
if(key.Length>bsize)
{
tmp=new byte[bsize];
Array.Copy(key, 0, tmp, 0, tmp.Length);
key=tmp;
}
try
{
// cipher=javax.crypto.Cipher.getInstance("DESede/CBC/"+pad);
/*
// The following code does not work on IBM's JDK 1.4.1
SecretKeySpec skeySpec = new SecretKeySpec(key, "DESede");
cipher.init((mode==ENCRYPT_MODE?
javax.crypto.Cipher.ENCRYPT_MODE:
javax.crypto.Cipher.DECRYPT_MODE),
skeySpec, new IvParameterSpec(iv));
*/
// DESedeKeySpec keyspec=new DESedeKeySpec(key);
// SecretKeyFactory keyfactory=SecretKeyFactory.getInstance("DESede");
// SecretKey _key=keyfactory.generateSecret(keyspec);
// cipher.init((mode==ENCRYPT_MODE?
// javax.crypto.Cipher.ENCRYPT_MODE:
// javax.crypto.Cipher.DECRYPT_MODE),
// _key, new IvParameterSpec(iv));
cipher = (mode==ENCRYPT_MODE?
triDes.CreateEncryptor(key, iv):
triDes.CreateDecryptor(key, iv));
}
catch(Exception e)
{
Console.WriteLine(e);
cipher=null;
}
}
private string DecryptString(string value)
{
try
{
byte[] resultBA = new byte[value.Length / 2], valueBA = new byte[value.Length / 2];
byte[] iv = new byte[] { 0x14, 0xD7, 0x5B, 0xA2, 0x47, 0x83, 0x0F, 0xC4 };
System.Text.ASCIIEncoding ascEncoding = new System.Text.ASCIIEncoding();
byte[] key = new byte[24] {
0x21, 0x24, 0x25, 0x23, 0x34, 0x32, 0x37, 0x34, 0x38, 0x6A, 0x73, 0x54, 0x54, 0x4C, 0x7A, 0X51, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
MemoryStream memStream = new MemoryStream();
byte[] tempBA = HexStringToBytes(value);
memStream.Write(tempBA, 0, tempBA.Length);
memStream.Position = 0;
System.Security.Cryptography.TripleDES
cryptoServiceProvider = System.Security.Cryptography.TripleDESCryptoServiceProvider.Create();
System.Security.Cryptography.ICryptoTransform
decryptor = cryptoServiceProvider.CreateDecryptor(key, iv);
System.Security.Cryptography.CryptoStream
cStream = new System.Security.Cryptography.CryptoStream(
memStream,
decryptor,
System.Security.Cryptography.CryptoStreamMode.Read);
cStream.Read(resultBA, 0, resultBA.Length);
cStream.Close();
// Find the first zero
int i = 0;
for (; i < resultBA.GetLength(0); i++)
{
if (resultBA[i] == 0)
{
break;
}
}
return(ascEncoding.GetString(resultBA, 0, i));
}
catch (Exception exc)
{
MessageBox.Show("Decryption failure. " + exc.ToString());
return(value);
}
}
static internal string DecryptString(string value)
{
try
{
byte[] resultBA = new byte[value.Length / 2], valueBA = new byte[value.Length / 2];
byte[] iv = new byte[] { 0x14, 0xD7, 0x5B, 0xA2, 0x47, 0x83, 0x0F, 0xC4 };
System.Text.ASCIIEncoding ascEncoding = new System.Text.ASCIIEncoding();
byte[] key = new byte[24] {
0x21, 0x24, 0x25, 0x23, 0x34, 0x32, 0x37, 0x34, 0x38, 0x6A, 0x73, 0x54, 0x54, 0x4C, 0x7A, 0X51, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
MemoryStream memStream = new MemoryStream();
byte[] tempBA = InternalMethods.HexStringToBytes(value);
memStream.Write(tempBA, 0, tempBA.Length);
memStream.Position = 0;
System.Security.Cryptography.TripleDES
cryptoServiceProvider = System.Security.Cryptography.TripleDESCryptoServiceProvider.Create();
System.Security.Cryptography.ICryptoTransform
decryptor = cryptoServiceProvider.CreateDecryptor(key, iv);
System.Security.Cryptography.CryptoStream
cStream = new System.Security.Cryptography.CryptoStream(
memStream,
decryptor,
System.Security.Cryptography.CryptoStreamMode.Read);
cStream.Read(resultBA, 0, resultBA.Length);
cStream.Close();
// Find the first zero
int i = 0;
for (; i < resultBA.GetLength(0); i++)
{
if (resultBA[i] == 0)
{
break;
}
}
return(ascEncoding.GetString(resultBA, 0, i));
}
catch (Exception exc)
{
EPSEventLog.WriteEntry("Decryption failure. Returning original value" + Environment.NewLine + exc.Source, EventLogEntryType.Error);
return(value);
}
}
public string DecryptString(string value, string keyString)
{
try
{
byte[] resultBA = new byte[value.Length / 2], valueBA = new byte[value.Length / 2];
byte[] iv = new byte[] { 0x14, 0xD7, 0x5B, 0xA2, 0x47, 0x83, 0x0F, 0xC4 };
System.Text.ASCIIEncoding ascEncoding = new System.Text.ASCIIEncoding();
byte[] key = new byte[24];
ascEncoding.GetBytes(keyString, 0, keyString.Length < 24?keyString.Length:24, key, 0);
MemoryStream memStream = new MemoryStream();
byte[] tempBA = InternalMethods.HexStringToBytes(value);
memStream.Write(tempBA, 0, tempBA.Length);
memStream.Position = 0;
System.Security.Cryptography.TripleDES
cryptoServiceProvider = System.Security.Cryptography.TripleDESCryptoServiceProvider.Create();
System.Security.Cryptography.ICryptoTransform
decryptor = cryptoServiceProvider.CreateDecryptor(key, iv);
System.Security.Cryptography.CryptoStream
cStream = new System.Security.Cryptography.CryptoStream(
memStream,
decryptor,
System.Security.Cryptography.CryptoStreamMode.Read);
cStream.Read(resultBA, 0, resultBA.Length);
cStream.Close();
return(ascEncoding.GetString(resultBA));
}
catch (Exception exc)
{
LogEvent("Decryption failure. Returning original value" +
Environment.NewLine + exc.Source, "DecryptString()", exc.ToString(), 3);
return(value);
}
}
public string Descriptografar(string chave, string criptografia)
{
System.Security.Cryptography.TripleDES des = System.Security.Cryptography.TripleDES.Create();
des.Mode = System.Security.Cryptography.CipherMode.CBC;
des.KeySize = 192;
byte[] chaveBytes;
byte[] criptografiaBytes;
byte[] mensagemBytes;
string mensagem;
chaveBytes = Encoding.UTF8.GetBytes(chave);
mensagemBytes = Convert.FromBase64String(criptografia);
System.Security.Cryptography.ICryptoTransform cryptor = des.CreateDecryptor(chaveBytes, chaveBytes);
criptografiaBytes = cryptor.TransformFinalBlock(mensagemBytes, 0, mensagemBytes.Length);
cryptor.Dispose();
mensagem = Encoding.UTF8.GetString(criptografiaBytes);
return(mensagem);
}
// ----- Decrypt the 3DES encrypted RSA private key ----------
static byte[] DecryptKey(byte[] cipherData, byte[] desKey, byte[] IV)
{
System.IO.MemoryStream memst = new System.IO.MemoryStream();
System.Security.Cryptography.TripleDES alg = System.Security.Cryptography.TripleDES.Create();
alg.Key = desKey;
alg.IV = IV;
try
{
System.Security.Cryptography.CryptoStream cs = new System.Security.Cryptography.CryptoStream(memst, alg.CreateDecryptor(), System.Security.Cryptography.CryptoStreamMode.Write);
cs.Write(cipherData, 0, cipherData.Length);
cs.Close();
}
catch (System.Exception exc)
{
System.Console.WriteLine(exc.Message);
return(null);
}
byte[] decryptedData = memst.ToArray();
return(decryptedData);
}
} // End Constructor
// http://www.codeproject.com/KB/aspnet/ASPNET_20_Webconfig.aspx
// http://www.codeproject.com/KB/database/Connection_Strings.aspx
public string DeCrypt(string strSourceText)
{
string result = null;
try
{
using (System.Security.Cryptography.TripleDES des3 = System.Security.Cryptography.TripleDES.Create())
{
using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
{
des3.Key = md5.ComputeHash(this.m_encoding.GetBytes(this.m_symmetricKey));
des3.Mode = System.Security.Cryptography.CipherMode.ECB;
} // End Using md5
if (Microsoft.VisualBasic.CompilerServices.Operators.CompareString(strSourceText, "", false) != 0)
{
using (System.Security.Cryptography.ICryptoTransform cryptoTransform = des3.CreateDecryptor())
{
byte[] array = System.Convert.FromBase64String(strSourceText);
des3.Clear();
result = this.m_encoding.GetString(cryptoTransform.TransformFinalBlock(array, 0, array.Length));
System.Array.Clear(array, 0, array.Length);
array = null;
} // End Using cryptoTransform
}
else
{
result = "";
}
} // End Using des3
return(result);
} // End Try
catch (System.Exception ex)
{
System.Console.WriteLine(ex.Message);
// TODO: Log
throw;
}
}
//Protected Shared strSymmetricKey As String = "Als symmetrischer Key kann irgendein Text verwendet werden. äöü'"
// http://www.codeproject.com/KB/aspnet/ASPNET_20_Webconfig.aspx
// http://www.codeproject.com/KB/database/Connection_Strings.aspx
public static string Decrypt(string sourceText)
{
string returnValue = "";
if (sourceText == null)
{
return(sourceText);
}
if (string.IsNullOrEmpty(sourceText))
{
return(returnValue);
}
using (System.Security.Cryptography.TripleDES Des = System.Security.Cryptography.TripleDES.Create())
{
using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
{
Des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(s_symmetricKey));
Des.Mode = System.Security.Cryptography.CipherMode.ECB;
using (System.Security.Cryptography.ICryptoTransform desDecryptor = Des.CreateDecryptor())
{
byte[] buff = System.Convert.FromBase64String(sourceText);
returnValue = System.Text.Encoding.UTF8.GetString(desDecryptor.TransformFinalBlock(buff, 0, buff.Length));
System.Array.Clear(buff, 0, buff.Length);
buff = null;
} // End Using desDecryptor
} // End Using md5
} // End Using Des
return(returnValue);
} // End Function DeCrypt