DES加密解密
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
/**
* Date: 2019/4/1
* autor:Wayne
*/
public class DesUtils
{ // 密钥
// private final static String secretKey = "my.oschina.net/penngo?#@" ;
// 向量
private final static String iv = "01234567" ;
// 加解密统一使用的编码方式
private final static String encoding = "utf-8" ;
/**
* 3DES加密
*
* @param plainText 普通文本
* @return
* @throws Exception
*/
public static String encode(String secretKey, String plainText) throws Exception {
Key deskey = null ;
DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" );
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance( "desede/CBC/PKCS5Padding" );
IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
byte [] encryptData = cipher.doFinal(plainText.getBytes(encoding));
return Base64.encode(encryptData);
}
/**
* 3DES解密
*
* @param encryptText 加密文本
* @return
* @throws Exception
*/
public static String decode(String secretKey,String encryptText) throws Exception {
Key deskey = null ;
DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" );
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance( "desede/CBC/PKCS5Padding" );
IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
byte [] decryptData = cipher.doFinal(Base64.decode(encryptText));
return new String(decryptData, encoding);
}
public static String padding(String str) {
byte[] oldByteArray;
try {
oldByteArray = str.getBytes("UTF8");
int numberToPad = 8 - oldByteArray.length % 8;
byte[] newByteArray = new byte[oldByteArray.length + numberToPad];
System.arraycopy(oldByteArray, 0, newByteArray, 0,
oldByteArray.length);
for (int i = oldByteArray.length; i < newByteArray.length; ++i) {
newByteArray[i] = 0;
}
return new String(newByteArray, "UTF8");
} catch (UnsupportedEncodingException e) {
System.out.println("Crypter.padding UnsupportedEncodingException");
}
return null;
}
/**
* Base64编码工具类
*
*/
public static class Base64 {
private static final char [] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" .toCharArray();
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();
}
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);
}
}
/**
* Decodes the given Base64 encoded String to a new byte array. The byte array holding the decoded data is returned.
*/
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 ;
}
}
}
public static void main(String[] args) throws Exception{
String secretKey = "my.oschina.net/penngo?#@" ;
String plainText = "来自http://my.oschina.net/penngo的博客";
String encryptText = DesUtils.encode(secretKey,plainText);
System.out.println(encryptText);
System.out.println(DesUtils.decode(secretKey,encryptText));
}
}要是得到一个MD5值
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Date: 2019/4/1
* autor:Wayne
*/
public class SignUtils {
public static String getPackageSignInfo(Context context, String packageName) {
try {
PackageInfo pis = context.getPackageManager().
getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
Signature[] sigs = pis.signatures;
String sig = new String(sigs[0].toChars());
return sig;
} catch (Exception e) {
return "";
}
}
public static String MD5Encode(String str) {
try {
byte[] digest = MessageDigest.getInstance("MD5").digest(str.getBytes());
StringBuffer stringBuffer = new StringBuffer();
for (byte b : digest) {
String toHexString = Integer.toHexString(b & 255);
if (toHexString.length() == 1) {
stringBuffer.append(0);
}
stringBuffer.append(toHexString);
}
return stringBuffer.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return null;
}
}
最后：前端后端配合加解密
//请求得到加密的数据
String data= json.getString(data);
//md5值
String packageSignInfo = SignUtils.getPackageSignInfo(context, CommonUtils.getPackageName());
String md5 = SignUtils.MD5Encode(packageSignInfo);
//解密后的数据
String data=DesUtils.decode(md5,data);