转载请注明：https://blog.csdn.net/qfashly/article/details/79815134
public class DESUtil {
private Key key;
private static final String DES = "DES";
public static final String[] KEY_ARR = { "IeJSB9d1lI02fswfds2", "zafZ6khrle5W8hATjKBAqQ", "so7uFYz4n0yk3faYxVHhiRB" };
/** * <p>Title: 密匙</p> * <p>Description: </p> * @param str */
public DESUtil(String str) {
setKey(str); // 生成密匙
}
public Key getKey() {
return key;
}
public void setKey(Key key) {
this.key = key;
}
/** * * @Title: setKey * @Description: 根据参数生成 KEY * @param strKey * @author chenxy * @date 2018-4-4 上午11:14:46 */
public void setKey(String strKey) {
try {
KeyGenerator generator = KeyGenerator.getInstance(DES);
generator.init(new SecureRandom(strKey.getBytes()));
this.key = generator.generateKey();
generator = null;
} catch (Exception e) {
throw new RuntimeException("Error initializing SqlMap class. Cause: " + e);
}
}
/** * @Title: encryptStr * @Description: 加密 String, 明文输入, String密文输出 * @param strMing * @return * @author chenxy * @date 2018-4-4 上午11:16:04 */
public String encryptStr(String strMing) {
byte[] byteMi = null;
byte[] byteMing = null;
String strMi = "";
BASE64Encoder base64en = new BASE64Encoder();
try {
byteMing = strMing.getBytes("UTF8");
byteMi = this.encryptByte(byteMing);
strMi = base64en.encode(byteMi);
} catch (Exception e) {
throw new RuntimeException(
"Error initializing SqlMap class. Cause: " + e);
} finally {
base64en = null;
byteMing = null;
byteMi = null;
}
return strMi;
}
/** * @Title: decryptStr * @Description: 解密, 以String密文输入, String明文输出 * @param strMi * @return * @author chenxy * @date 2018-4-4 上午11:16:32 */
public String decryptStr(String strMi) {
BASE64Decoder base64De = new BASE64Decoder();
byte[] byteMing = null;
byte[] byteMi = null;
String strMing = "";
try {
byteMi = base64De.decodeBuffer(strMi);
byteMing = this.decryptByte(byteMi);
strMing = new String(byteMing, "UTF8");
} catch (Exception e) {
throw new RuntimeException("Error initializing SqlMap class. Cause: " + e);
} finally {
base64De = null;
byteMing = null;
byteMi = null;
}
return strMing;
}
/** * @Title: encryptByte * @Description: 加密, 以byte[]明文输入, byte[]密文输出 * @param byteS * @return * @author chenxy * @date 2018-4-4 上午11:17:08 */
private byte[] encryptByte(byte[] byteS) {
byte[] byteFina = null;
Cipher cipher;
try {
cipher = Cipher.getInstance(DES);
cipher.init(Cipher.ENCRYPT_MODE, key);
byteFina = cipher.doFinal(byteS);
} catch (Exception e) {
throw new RuntimeException("Error initializing SqlMap class. Cause: " + e);
} finally {
cipher = null;
}
return byteFina;
}
/** * * @Title: decryptByte * @Description: 解密, 以byte[]密文输入, 以 byte[] 明文输出 * @param byteD * @return * @author chenxy * @date 2018-4-4 上午11:17:39 */
private byte[] decryptByte(byte[] byteD) {
Cipher cipher;
byte[] byteFina = null;
try {
cipher = Cipher.getInstance(DES);
cipher.init(Cipher.DECRYPT_MODE, key);
byteFina = cipher.doFinal(byteD);
} catch (Exception e) {
throw new RuntimeException("Error initializing SqlMap class. Cause: " + e);
} finally {
cipher = null;
}
return byteFina;
}
/** * * @Title: encryptFile * @Description: 文件file进行加密并保存目标文件destFile中 * @param file 要加密的文件 * @param destFile 加密后存放的文件名 * @throws Exception * @author chenxy * @date 2018-4-4 上午11:18:05 */
public void encryptFile(String file, String destFile) throws Exception {
Cipher cipher = Cipher.getInstance(DES);
cipher.init(Cipher.ENCRYPT_MODE, this.key);
InputStream is = new FileInputStream(file);
OutputStream out = new FileOutputStream(destFile);
CipherInputStream cis = new CipherInputStream(is, cipher);
byte[] buffer = new byte[1024];
int r;
while ((r = cis.read(buffer)) > 0) {
out.write(buffer, 0, r);
}
cis.close();
is.close();
out.close();
}
/** * * @Title: decryptFile * @Description: 文件采用DES算法解密文件 * @param file 已加密的文件 * @param dest 解密后存放的文件 * @throws Exception * @author chenxy * @date 2018-4-4 上午11:19:00 */
public void decryptFile(String file, String dest) throws Exception {
Cipher cipher = Cipher.getInstance(DES);
cipher.init(Cipher.DECRYPT_MODE, this.key);
InputStream is = new FileInputStream(file);
OutputStream out = new FileOutputStream(dest);
CipherOutputStream cos = new CipherOutputStream(out, cipher);
byte[] buffer = new byte[1024];
int r;
while ((r = is.read(buffer)) >= 0) {
cos.write(buffer, 0, r);
}
cos.close();
out.close();
is.close();
}
public static void main(String[] args) throws Exception {
DESUtil des = new DESUtil(DESUtil.KEY_ARR[0]);
// DES 待加密字符串
String encryStr1 = "java是应用最广泛的编程语言";
// DES 加密后字符串
String decryStr1 = des.encryptStr(encryStr1);
System.out.println("待加密字符串： " + encryStr1);
System.out.println("加密后字符串： " + decryStr1);
System.out.println("----------------------------");
// DES 待解密字符串
String decryStr2 = "dy0DrwjwlWMg0PwTrx0alcnAGo6gy7XIE6nqslMpf3sSgFp20pL/mg==";
// DES 解密后字符串
String encryStr2 = des.decryptStr(decryStr2);
System.out.println("待解密字符串： " + decryStr2);
System.out.println("解密后字符串： " + encryStr2);
}
}
结果输出：
待加密字符串： java是应用最广泛的编程语言
加密后字符串： PYeeAdRgSJAsX4BNOOQWbgHmLn4h9aKr7Dz3OP9v+uA2309/GY4oCQ==
待解密字符串： dy0DrwjwlWMg0PwTrx0alcnAGo6gy7XIE6nqslMpf3sSgFp20pL/mg==
解密后字符串： PHP是世界上最好的编程语言