移动开发---DES加密解密

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);
 

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