参考地址：
http://scottmaxiao.github.io/Java%E5%8A%A0%E5%AF%86%E7%AE%97%E6%B3%95-DES.html
http://blog.csdn.net/rj042/article/details/8196125
完成byte[] String转换
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
public class DesUtils {
private static final String DES_ALGORITHM = "DES";
private static Logger logger = LoggerFactory.getLogger("util");
public static String encrypt(String plainData, String secretKey) throws Exception{
Cipher cipher = null;
try {
cipher = Cipher.getInstance(DES_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, generateKey(secretKey));
} catch (NoSuchAlgorithmException e) {
logger.error(String.valueOf(e.getStackTrace()));
} catch (NoSuchPaddingException e) {
logger.error(String.valueOf(e.getStackTrace()));
}
try {
byte[] buf = cipher.doFinal(plainData.getBytes());
return byteArr2HexStr(buf);
} catch (IllegalBlockSizeException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("IllegalBlockSizeException", e);
} catch (BadPaddingException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("BadPaddingException", e);
}
}
public static String decrypt(String secretData, String secretKey) throws Exception{
Cipher cipher = null;
try {
cipher = Cipher.getInstance(DES_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, generateKey(secretKey));
} catch (NoSuchAlgorithmException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("NoSuchAlgorithmException", e);
} catch (NoSuchPaddingException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("NoSuchPaddingException", e);
}catch(InvalidKeyException e){
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("InvalidKeyException", e);
}
try {
byte[] buf = cipher.doFinal(hexStr2ByteArr(secretData));
return new String(buf);
} catch (IllegalBlockSizeException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("IllegalBlockSizeException", e);
} catch (BadPaddingException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("BadPaddingException", e);
}
}
private static String byteArr2HexStr(byte[] arrB) throws Exception {
int iLen = arrB.length;
StringBuffer sb = new StringBuffer(iLen * 2);
for (int i = 0; i < iLen; i++) {
int intTmp = arrB[i];
while (intTmp < 0) {
intTmp = intTmp + 256;
}
if (intTmp < 16) {
sb.append("0");
}
sb.append(Integer.toString(intTmp, 16));
}
return sb.toString();
}
private static byte[] hexStr2ByteArr(String strIn) throws Exception {
byte[] arrB = strIn.getBytes();
int iLen = arrB.length;
byte[] arrOut = new byte[iLen / 2];
for (int i = 0; i < iLen; i = i + 2) {
String strTmp = new String(arrB, i, 2);
arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
}
return arrOut;
}
private static SecretKey generateKey(String secretKey) throws NoSuchAlgorithmException,InvalidKeyException,InvalidKeySpecException{
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES_ALGORITHM);
DESKeySpec keySpec = new DESKeySpec(secretKey.getBytes());
keyFactory.generateSecret(keySpec);
return keyFactory.generateSecret(keySpec);
}
}
使用base64转换
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
public class DESUtils {
private static final String DES_ALGORITHM = "DES";
private static Logger logger = LoggerFactory.getLogger("util");
public static String encrypt(String plainData, String secretKey) throws Exception{
Cipher cipher = null;
try {
cipher = Cipher.getInstance(DES_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, generateKey(secretKey));
} catch (NoSuchAlgorithmException e) {
logger.error(String.valueOf(e.getStackTrace()));
} catch (NoSuchPaddingException e) {
logger.error(String.valueOf(e.getStackTrace()));
}
try {
byte[] buf = cipher.doFinal(plainData.getBytes());
// return byteArr2HexStr(buf);
return new BASE64Encoder().encode(buf);
} catch (IllegalBlockSizeException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("IllegalBlockSizeException", e);
} catch (BadPaddingException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("BadPaddingException", e);
}
}
public static String decrypt(String secretData, String secretKey) throws Exception{
Cipher cipher = null;
try {
cipher = Cipher.getInstance(DES_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, generateKey(secretKey));
} catch (NoSuchAlgorithmException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("NoSuchAlgorithmException", e);
} catch (NoSuchPaddingException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("NoSuchPaddingException", e);
}catch(InvalidKeyException e){
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("InvalidKeyException", e);
}
try {
//byte[] buf = cipher.doFinal(hexStr2ByteArr(secretData));
byte[] buf = cipher.doFinal(new BASE64Decoder().decodeBuffer(secretData));
return new String(buf);
} catch (IllegalBlockSizeException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("IllegalBlockSizeException", e);
} catch (BadPaddingException e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("BadPaddingException", e);
} catch (Exception e) {
logger.error(String.valueOf(e.getStackTrace()));
throw new Exception("Exception", e);
}
}
private static SecretKey generateKey(String secretKey) throws NoSuchAlgorithmException,InvalidKeyException,InvalidKeySpecException{
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES_ALGORITHM);
DESKeySpec keySpec = new DESKeySpec(secretKey.getBytes());
keyFactory.generateSecret(keySpec);
return keyFactory.generateSecret(keySpec);
}
}