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2010-06-01T05:01:36Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Create a 192 bit secret key from raw bytes ==



<source lang="java">
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class MainClass {
public static void main(String[] args) throws Exception {
byte[] data = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
Cipher c = Cipher.getInstance("Blowfish/ECB/NoPadding");
SecretKey key192 = new SecretKeySpec(new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
0x16, 0x17 }, "Blowfish");
c.init(Cipher.ENCRYPT_MODE, key192);
c.doFinal(data);
}
}</source>



== Create a 64 bit secret key from raw bytes ==



<source lang="java">
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class MainClass {
public static void main(String[] args) throws Exception {
byte[] data = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
SecretKey key64 = new SecretKeySpec(
new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 }, "Blowfish");
Cipher c = Cipher.getInstance("Blowfish/ECB/NoPadding");
c.init(Cipher.ENCRYPT_MODE, key64);
c.doFinal(data);
}
}</source>



== Create SecretKey ==



<source lang="java">
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
public class MainClass {
public static void main(String[] args) throws Exception {
KeyGenerator kg = KeyGenerator.getInstance("DESede");
Key sharedKey = kg.generateKey();
String password = "password";
byte[] salt = "salt1234".getBytes();
PBEParameterSpec paramSpec = new PBEParameterSpec(salt, 20);
PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory kf = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey passwordKey = kf.generateSecret(keySpec);
Cipher c = Cipher.getInstance("PBEWithMD5AndDES");
c.init(Cipher.WRAP_MODE, passwordKey, paramSpec);
byte[] wrappedKey = c.wrap(sharedKey);
c = Cipher.getInstance("DESede");
c.init(Cipher.ENCRYPT_MODE, sharedKey);
byte[] input = "input".getBytes();
byte[] encrypted = c.doFinal(input);
c = Cipher.getInstance("PBEWithMD5AndDES");
c.init(Cipher.UNWRAP_MODE, passwordKey, paramSpec);
Key unwrappedKey = c.unwrap(wrappedKey, "DESede", Cipher.SECRET_KEY);
c = Cipher.getInstance("DESede");
c.init(Cipher.DECRYPT_MODE, unwrappedKey);
System.out.println(new String(c.doFinal(encrypted)));
}
}</source>



== implements SecretKey ==



<source lang="java">
import javax.crypto.SecretKey;
public class XORKey implements SecretKey {
int rotValue;
XORKey(int value) {
rotValue = value;
}
public String getAlgorithm() {
return "XOR";
}
public String getFormat() {
return "XOR Special Format";
}
public byte[] getEncoded() {
byte b[] = new byte[4];
b[3] = (byte) ((rotValue << 24) & 0xff);
b[2] = (byte) ((rotValue << 16) & 0xff);
b[1] = (byte) ((rotValue << 8) & 0xff);
b[0] = (byte) ((rotValue << 0) & 0xff);
return b;
}
}</source>

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Admin: 1 версия

в 17:44, 31 мая 2010