Android AES加密工具类分享
1、AES加密工具类
java不支持PKCS7Padding,只支持PKCS5Padding。我们知道加密算法由算法+模式+填充组成,下一篇介绍iOS和Android通用的AES加密,本篇文章使用PKCS5Padding加密方式。
packagecom.example.aesdemo; importjava.io.UnsupportedEncodingException; importjavax.crypto.Cipher; importjavax.crypto.spec.SecretKeySpec; ///**AES对称加密解密类**/ publicclassAESHelper{ ///**算法/模式/填充**/ privatestaticfinalStringCipherMode="AES/ECB/PKCS5Padding"; ///**创建密钥**/ privatestaticSecretKeySpeccreateKey(Stringpassword){ byte[]data=null; if(password==null){ password=""; } StringBuffersb=newStringBuffer(32); sb.append(password); while(sb.length()<32){ sb.append("0"); } if(sb.length()>32){ sb.setLength(32); } try{ data=sb.toString().getBytes("UTF-8"); }catch(UnsupportedEncodingExceptione){ e.printStackTrace(); } returnnewSecretKeySpec(data,"AES"); } ///**加密字节数据**/ publicstaticbyte[]encrypt(byte[]content,Stringpassword){ try{ SecretKeySpeckey=createKey(password); System.out.println(key); Ciphercipher=Cipher.getInstance(CipherMode); cipher.init(Cipher.ENCRYPT_MODE,key); byte[]result=cipher.doFinal(content); returnresult; }catch(Exceptione){ e.printStackTrace(); } returnnull; } ///**加密(结果为16进制字符串)**/ publicstaticStringencrypt(Stringcontent,Stringpassword){ byte[]data=null; try{ data=content.getBytes("UTF-8"); }catch(Exceptione){ e.printStackTrace(); } data=encrypt(data,password); Stringresult=byte2hex(data); returnresult; } ///**解密字节数组**/ publicstaticbyte[]decrypt(byte[]content,Stringpassword){ try{ SecretKeySpeckey=createKey(password); Ciphercipher=Cipher.getInstance(CipherMode); cipher.init(Cipher.DECRYPT_MODE,key); byte[]result=cipher.doFinal(content); returnresult; }catch(Exceptione){ e.printStackTrace(); } returnnull; } ///**解密16进制的字符串为字符串**/ publicstaticStringdecrypt(Stringcontent,Stringpassword){ byte[]data=null; try{ data=hex2byte(content); }catch(Exceptione){ e.printStackTrace(); } data=decrypt(data,password); if(data==null) returnnull; Stringresult=null; try{ result=newString(data,"UTF-8"); }catch(UnsupportedEncodingExceptione){ e.printStackTrace(); } returnresult; } ///**字节数组转成16进制字符串**/ publicstaticStringbyte2hex(byte[]b){//一个字节的数, StringBuffersb=newStringBuffer(b.length*2); Stringtmp=""; for(intn=0;n<b.length;n++){ //整数转成十六进制表示 tmp=(java.lang.Integer.toHexString(b[n]&0XFF)); if(tmp.length()==1){ sb.append("0"); } sb.append(tmp); } returnsb.toString().toUpperCase();//转成大写 } ///**将hex字符串转换成字节数组**/ privatestaticbyte[]hex2byte(StringinputString){ if(inputString==null||inputString.length()<2){ returnnewbyte[0]; } inputString=inputString.toLowerCase(); intl=inputString.length()/2; byte[]result=newbyte[l]; for(inti=0;i<l;++i){ Stringtmp=inputString.substring(2*i,2*i+2); result[i]=(byte)(Integer.parseInt(tmp,16)&0xFF); } returnresult; } }
2、使用
新建Android工程
packagecom.example.aesdemo; importandroid.os.Bundle; importandroid.app.Activity; importandroid.view.Menu; importandroid.util.Log; publicclassMainActivityextendsActivity{ protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); StringmasterPassword="a"; StringoriginalText="于"; try{ StringencryptingCode=AESHelper.encrypt(originalText,masterPassword); // System.out.println("加密结果为"+encryptingCode); Log.i("加密结果为",encryptingCode); StringdecryptingCode=AESHelper.decrypt(encryptingCode,masterPassword); // System.out.println("解密结果为"+decryptingCode); Log.i("解密结果",decryptingCode); }catch(Exceptione){ //TODOAuto-generatedcatchblock e.printStackTrace(); } } @Override publicbooleanonCreateOptionsMenu(Menumenu){ //Inflatethemenu;thisaddsitemstotheactionbarifitispresent. getMenuInflater().inflate(R.menu.main,menu); returntrue; } }
3、打印结果
09-1910:41:05.467:I/加密结果为(707):E55C24701F6380478E1940ADDFD08D22 09-1910:41:05.467:I/解密结果(707):于