看这个贴子
http://expert.csdn.net/Expert/topic/726/726335.xml?temp=.6038629
http://expert.csdn.net/Expert/topic/726/726335.xml?temp=.6038629
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import java.security.spec.*;
import javax.crypto.*;
import javax.crypto.spec.*;
public class DesEncrypter
{
Cipher ecipher;
Cipher dcipher;
// 8-byte Salt
byte[] salt =
{
(byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
(byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
};
// Iteration count
int iterationCount = 19; DesEncrypter(SecretKey key)
{
// Create an 8-byte initialization vector
byte[] iv = new byte[]{
(byte)0x8E, (byte)0x12, (byte)0x39, (byte)0x9C,
(byte)0x07, (byte)0x72, (byte)0x6F, (byte)0x5A
};
AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
try
{
ecipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
dcipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); // CBC requires an initialization vector
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
}
catch (java.security.InvalidAlgorithmParameterException e)
{
}
catch (javax.crypto.NoSuchPaddingException e)
{
}
catch (java.security.NoSuchAlgorithmException e)
{
}
catch (java.security.InvalidKeyException e)
{
}
}
DesEncrypter(String passPhrase)
{
try
{
// Create the key
KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
// Prepare the parameter to the ciphers
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
// Create the ciphers
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
}
catch (java.security.InvalidAlgorithmParameterException e)
{
}
catch (java.security.spec.InvalidKeySpecException e)
{
}
catch (javax.crypto.NoSuchPaddingException e)
{
}
catch (java.security.NoSuchAlgorithmException e)
{
}
catch (java.security.InvalidKeyException e)
{
}
} // Buffer used to transport the bytes from one stream to another
byte[] buf = new byte[1024]; public void encrypt(InputStream in, OutputStream out)
{
try
{
// Bytes written to out will be encrypted
out = new CipherOutputStream(out, ecipher); // Read in the cleartext bytes and write to out to encrypt
int numRead = 0;
while ((numRead = in.read(buf)) >= 0)
{
out.write(buf, 0, numRead);
}
out.close();
}
catch (java.io.IOException e)
{
}
} public void decrypt(InputStream in, OutputStream out)
{
try
{
// Bytes read from in will be decrypted
in = new CipherInputStream(in, dcipher); // Read in the decrypted bytes and write the cleartext to out
int numRead = 0;
while ((numRead = in.read(buf)) >= 0)
{
out.write(buf, 0, numRead);
}
out.close();
}
catch (java.io.IOException e)
{
}
}
public String encrypt(String str)
{
try
{
// Encode the string into bytes using utf-8
byte[] utf8 = str.getBytes("UTF8");
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
// Encode bytes to base64 to get a string
return new sun.misc.BASE64Encoder().encode(enc);
}
catch (javax.crypto.BadPaddingException e)
{
}
catch (IllegalBlockSizeException e)
{
}
catch (UnsupportedEncodingException e)
{
}
catch (java.io.IOException e)
{
}
return null;
}
public String decrypt(String str)
{
try
{
// Decode base64 to get bytes
byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
// Decrypt
byte[] utf8 = dcipher.doFinal(dec);
// Decode using utf-8
return new String(utf8, "UTF8");
}
catch (javax.crypto.BadPaddingException e)
{
}
catch (IllegalBlockSizeException e)
{
}
catch (UnsupportedEncodingException e)
{
}
catch (java.io.IOException e)
{
}
return null;
}
}