DES 数据加密
2016-07-19 11:01
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在开发的时候向服务发起请求的时候，有时候请求的结果需要加密。
本文简单介绍下DES的加密用法；
一，八位的密钥的加解密
日志：
涉及的两个类：
Base64 类
DES类
二，密钥大于8位的DES加解密
Log
涉及的类
Des2
本文简单介绍下DES的加密用法；
一，八位的密钥的加解密
String plaintext = "我1234567890从";
String ciphertext = DES.encryptDES(plaintext, "89018D39");
Log.d("DES","明文：" + plaintext);
Log.d("DES","密钥：" + "89018D39");
Log.d("DES","密文：" + ciphertext);
Log.d("DES","解密后：" + DES.decryptDES(ciphertext, "89018D39"));日志：
D/DES: 明文：我1234567890从 D/DES: 密钥：89018D39 D/DES: 密文：Tpv9Fxx36WElIZN1QdCZpa3NGbzSpyNi D/DES: 解密后：我1234567890从
涉及的两个类：
Base64 类
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* Created by jimda on 2016/7/14.
*/
public class Base64 {
private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
.toCharArray();
/**
* data[]进行编码
*
* @param data
* @return
*/
public static String encode(byte[] data) {
int start = 0;
int len = data.length;
StringBuffer buf = new StringBuffer(data.length * 3 / 2);
int end = len - 3;
int i = start;
int n = 0;
while (i <= end) {
int d = ((((int) data[i]) & 0x0ff) << 16)
| ((((int) data[i + 1]) & 0x0ff) << 8)
| (((int) data[i + 2]) & 0x0ff);
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append(legalChars[d & 63]);
i += 3;
if (n++ >= 14) {
n = 0;
buf.append(" ");
}
}
if (i == start + len - 2) {
int d = ((((int) data[i]) & 0x0ff) << 16)
| ((((int) data[i + 1]) & 255) << 8);
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append("=");
} else if (i == start + len - 1) {
int d = (((int) data[i]) & 0x0ff) << 16;
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append("==");
}
return buf.toString();
}
public static byte[] decode(String s) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
decode(s, bos);
} catch (IOException e) {
throw new RuntimeException();
}
byte[] decodedBytes = bos.toByteArray();
try {
bos.close();
bos = null;
} catch (IOException ex) {
System.err.println("Error while decoding BASE64: " + ex.toString());
}
return decodedBytes;
}
private static void decode(String s, OutputStream os) throws IOException {
int i = 0;
int len = s.length();
while (true) {
while (i < len && s.charAt(i) <= ' ')
i++;
if (i == len)
break;
int tri = (decode(s.charAt(i)) << 18)
+ (decode(s.charAt(i + 1)) << 12)
+ (decode(s.charAt(i + 2)) << 6)
+ (decode(s.charAt(i + 3)));
os.write((tri >> 16) & 255);
if (s.charAt(i + 2) == '=')
break;
os.write((tri >> 8) & 255);
if (s.charAt(i + 3) == '=')
break;
os.write(tri & 255);
i += 4;
}
}
private static int decode(char c) {
if (c >= 'A' && c <= 'Z')
return ((int) c) - 65;
else if (c >= 'a' && c <= 'z')
return ((int) c) - 97 + 26;
else if (c >= '0' && c <= '9')
return ((int) c) - 48 + 26 + 26;
else
switch (c) {
case '+':
return 62;
case '/':
return 63;
case '=':
return 0;
default:
throw new RuntimeException("unexpected code: " + c);
}
}
}DES类
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
* Created by jimda on 2016/7/14.
*/
public class DES {
private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };
public static String encryptDES(String encryptString, String encryptKey)
throws Exception {
IvParameterSpec zeroIv = new IvParameterSpec(iv);
SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
byte[] encryptedData = cipher.doFinal(encryptString.getBytes());
return Base64.encode(encryptedData);
}
public static String decryptDES(String decryptString, String decryptKey)
throws Exception {
byte[] byteMi = Base64.decode(decryptString);
IvParameterSpec zeroIv = new IvParameterSpec(iv);
SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
byte decryptedData[] = cipher.doFinal(byteMi);
return new String(decryptedData);
}
}二，密钥大于8位的DES加解密
String plaintext = "我1234567890从";
String ciphertext = Des2.encode("eb3e52920ffcd2b676cb17c3528e974a",plaintext);
Log.d("DES","密钥：" + "eb3e52920ffcd2b676cb17c3528e974a");
Log.d("DES","解密后：" + Des2.decodeValue( "eb3e52920ffcd2b676cb17c3528e974a", ciphertext));Log
密钥：eb3e52920ffcd2b676cb17c3528e974a 解密后：我1234567890从
涉及的类
Des2
import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
public class Des2
{
public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };
/**
* DES算法，加密
*
* @param data 待加密字符串
* @param key 加密私钥，长度不能够小于8位
* @return 加密后的字节数组，一般结合Base64编码使用
* @throws CryptException 异常
*/
public static String encode(String key,String data) throws Exception
{
return encode(key, data.getBytes());
}
/**
* DES算法，加密
*
* @param data 待加密字符串
* @param key 加密私钥，长度不能够小于8位
* @return 加密后的字节数组，一般结合Base64编码使用
* @throws CryptException 异常
*/
public static String encode(String key,byte[] data) throws Exception
{
try
{
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
// IvParameterSpec iv = new IvParameterSpec("********".getBytes());
IvParameterSpec zeroIv = new IvParameterSpec(iv);
AlgorithmParameterSpec paramSpec = zeroIv;
cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
byte[] bytes = cipher.doFinal(data);
return Base64.encode(bytes);
} catch (Exception e)
{
throw new Exception(e);
}
}
/**
* DES算法，解密
*
* @param data 待解密字符串
* @param key 解密私钥，长度不能够小于8位
* @return 解密后的字节数组
* @throws Exception 异常
*/
public static byte[] decode(String key,byte[] data) throws Exception
{
try
{
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
// IvParameterSpec iv = new IvParameterSpec("********".getBytes());
IvParameterSpec zeroIv = new IvParameterSpec(iv);
AlgorithmParameterSpec paramSpec = zeroIv;
cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec);
return cipher.doFinal(data);
} catch (Exception e)
{
// e.printStackTrace();
throw new Exception(e);
}
}
/**
* 获取编码后的值
* @param key
* @param data
* @return
* @throws Exception
* @throws Exception
*/
public static String decodeValue(String key,String data) throws Exception
{
byte[] datas;
String value = null;
datas = decode(key, Base64.decode(data));
value = new String(datas);
if (value.equals("")){
throw new Exception();
}
return value;
}
}
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