JAVA實現(xiàn)AES加密算法代碼

1、JAVA實現(xiàn)AES加密算法代碼JAVA實現(xiàn)AES加密算法代碼近些年DES使用越來越少，原因就在于其使用56位密鑰，比較容易被破解，近些年來逐漸被AES替代，AES已經(jīng)變成目前對稱加密中最流行算法之一;AES可以使用128、192、和256位密鑰，并且用128位分組加密和解密數(shù)據(jù)。本文就簡單介紹如何通過JAVA實現(xiàn)AES加密。LJAVA實現(xiàn)閑話少許，掠過AES加密原理及算法，關(guān)于這些直接搜索專業(yè)網(wǎng)站吧，我們直接看JAVA的具體實現(xiàn)。1.1加密代碼有詳細(xì)解釋，不多廢話。/* 加密*paramcontent需要加密的內(nèi)容*param password 加密密碼* ©return */pub

2、licstaticbyteencrypt(Stringcontent,Stringpassword)tryKeyGeneratorkgen=KeyGeneratongetInstance(uAESn);kgen>init(l28,newSecureRandom(password>getBytes();SecretKeysecretKey=kgen.generateKey();byteenCodeFormat=secretKey>getEncoded();SecretKeySpeckey=newSecretKeySpec(enCodeFormat,f,AESft);Cipher

3、cipherbyte口=Ciphengetlnstance(11AES11);/創(chuàng)建密碼器byteContent=contentegetBytes(11utf-8H);cipheninit(Cipher.ENCRYPT_MODE,key);/初始化byte|Jresult=cipheEdoFinal(byteContent);returnresult;/力口密catch(NoSuchAlgorithmExceptione)CeprintStackTraceO;catch(NoSuchPaddingExceptione)e>printStackTrace();catch(InvalidKe

4、yExceptione)e.printStackTrace();catch(UnsupportedEncodingExceptione)e>printStackTraceO；catch(IllegalBlockSizeExccptione)e>printStackTrace();catch(BadPaddingExceptione)e>printStackTrace();returnnull;/*加密*paramcontent需要加密的內(nèi)publicstaticbyte|Jencrypt(Stringcontent,Stringpassword)* param passwor

5、d 加密密碼* return */tryKeyGeneratorkgen=KeyGenerator.getInstance(nAESn);kgen.init(128,newSecureRandom(password.getBytes();SecretKeysecretKey=kgen>generateKey();byte|enCodeFormat=secretKey<getEncoded();SecretKeySpeckey=newSecretKeySpec(enCodeFormat,nAESn);Ciphercipher=Cipher.getrnstance(uAESn);/創(chuàng)建

6、密碼器byte|byteContent=content.getBytes(nutf-8n);cipher.init(Cipher.ENCRYPT_MODE,key);/初始化byte|result=cipheEdoFinal(byteContent);returnresult;/力口密catch(NoSuchAlgorithmExceptione)e>printStackTrace();catch(NoSuchPaddingExceptione)e>printStackTrace();catch(InvalidKeyExceptione)e.printStackTrace();ca

7、tch(UnsupportedEncodingExceptione)eeprintStackTraceO;catch(IllegalBlockSizeExceptione)e>printStackTrace();catch(BadPaddingExceptione)e>printStackTrace();returnnull;2.2解密代碼有詳細(xì)注釋，不多廢話注意：解密的時候要傳入byte數(shù)組viewplaincopytoclipboardprint?/*解密*paramcontent待解密內(nèi)容*parampassword解密密鑰*return*/publicstaticbyte|

8、decrypt(bytecontent,Stringpassword)tryKeyGeneratorkgen=KeyGeneratongetInstance(nAESn);kgen>init(128,newSecureRandom(password>getBytes();SecretKeysecretKey=kgen>generateKey();byte|enCodeFormat=secretKey<getEncoded();SecretKeySpeckey=newSecretKeySpec(enCodeFormat,f,AESH);Ciphercipher=Ciphe

9、ngetlnstance(nAESu);/創(chuàng)建密碼器cipheranit(Cipher.DECRYPT_MODE,key);/初始化byteresult=cipher.doFinal(content);returnresult;/力口密catch(NoSuchAIgorithmExceptione)eeprintStackTrace();catch(NoSuchPaddingExceptione)eeprintStackTrace();catch(InvalidKeyExceptione)eeprintStackTrace();catch(IllegalBlockSizeExceptione)

10、e.printStackTi*ace();catch(BadPaddingExceptione)e.printStackTrace();returnnull;/*解密*paramcontent待解密內(nèi)容*parampassword解密密鑰*©return*/publicstaticbytedecrypt(bytecontent,Stringpassword)tryKeyGeneratorkgen=KeyGeneratongetlnstance(11AESn);kgen.init(l28,newSecureRandom(password>getBytes();SecretKeys

11、ecretKey=kgen.generateKey();byteenCodeFormat=secretKey>getEncoded();SecretKeySpeckey=newSecretKeySpec(enCodeFormat,f,AESn);Ciphercipher=Cipher.getlnstance(nAES11);/創(chuàng)建密工二cipheninit(Cipher.DECRYPT_MODE,key);/初始化byteresult=cipher.doFinal(content);returnresult;/加密catch(NoSuchAIgorithmExceptione)eepri

12、ntStackTrace();catch(NoSuchPaddingExceptione)eeprintStackTrace();catch(InvalidKeyExceptione)eeprintStackTrace();catch(IllegalBlockSizeExceptione)eeprintStackTrace();catch(BadPaddingExceptione)eeprintStackTrace();returnnull;2.3測試代碼Stringcontent=Mtestn;Stringpassword="12345678”;加密System.out.print

13、ln("力口密前：n+content);byteencryptResult=encrypt(content,password);解密bytedecryptResult=decrypt(encryptResult,password);System.out.println("解密后：n+newString(decryptResult);Stringcontent=''test"Stringpassword="12345678''加密System.out.printing'力口密前："+content);byt

14、eencryptResult=encrypt(content,password);解密bytedecryptResult=decrypt(encryptResult,password);System>out>println(u解密后：”+newString(decryptResult);輸出結(jié)果如下：加密前:test解密后:test2.4容易出錯的地方但是如果我們將測試代碼修改一下，如下:String content="test"；Stringpassword="12345678"加密System.out.println("力口密前

15、："+content);bytetryencryptResult=encrypt(content,password);StringencryptResultStr=newString(encryptResult,futf-8f,);解密bytedecryptResult=decrypt(encryptResultStngetBytes(nutf-8''),password);System.out.println("解密后：n+newString(decryptResult);catch(UnsupportedEncodingExceptione)e.prin

16、tStackTrace();Stringcontent=HtestH;Stringpassword="12345678”;加密System.out.printing力口密前：n+content);byteencryptResult=encrypt(content,password);tryStringencryptResultStr=newString(encryptResult,11utf-8,1;解密bytedecryptResult=decrypt(encryptResultStngetBytes(nutf-8''),password);System.out.p

17、rintln("解密后：''+newString(decryptResult);catch(UnsupportedEncodingExceptione)e.printStackTrace();)貝!系統(tǒng)會報出如下異常：javaXeCryptoJllegalBlockSizeException:Inputlengthmustbemultipleof16whendecryptingwithpaddedcipheratcom>sunecrypto>providenSunJCE_feb(DashoA13*.)atcom.sunecryptOeprovidenSun

18、JCE_feb(DashoA13*e.)atcomeSun>crypto>providenAESCipher.engineDoFinal(DashoA13*.)atjavax.crypto.Cipher.doFinal(DashoA13*.)這主要是因為加密后的byte數(shù)組是不能強(qiáng)制轉(zhuǎn)換成字符串的，換言之：字符串和byte數(shù)組在這種情況下不是互逆的；要避免這種情況，我們需要做一些修訂，可以考慮將二進(jìn)制數(shù)據(jù)轉(zhuǎn)換成十六進(jìn)制表示，主要有如下兩個方法：2.4.1將二進(jìn)制轉(zhuǎn)換成16進(jìn)制/*將二進(jìn)制轉(zhuǎn)換成16進(jìn)制*parambuf*©return*/publicstaticStrin

19、gparseByte2HexStr(bytebuf)StringBuffersb=newStringBuffer();for(inti=0;iStringhex=Integer.toHexString(bufi&OxFF);if(hex.length()=1)hex='O'+hex;sb.append(hex.toUpperCase();returnsb.toString();/*將二進(jìn)制轉(zhuǎn)換成16進(jìn)制*parambuf*©return*/publicstaticStringparseByte2HexStr(bytebuf)StringBuffersb=new

20、StringBuffer()；for(inti=0;iStringhex=Integer.toHexString(bufi&OxFF);if(hex.length()=1)hex='O'+hex;sb.append(hex.toUpperCase();returnsb.toString();2.4.2將16進(jìn)制轉(zhuǎn)換為二進(jìn)制/*將16進(jìn)制轉(zhuǎn)換為二進(jìn)制*paramhexStr*©return*/publicstaticbyteparseHexStr2Byte(StringhexStr)if(hexStr.length()returnnull;byteresult=

21、newbytehexStr.length()/2;for(inti=0;iinthigh=Integer.parseInt(hexStr.substring(i*2,i*2+l),16);intlow=Integer.parseInt(hexStr.substring(i*2+l,i*2+2),16);resulti=(byte)(high*16+low);returnresult;/*將16進(jìn)制轉(zhuǎn)換為二進(jìn)制*paramhexStr*return*/publicstaticbyteparseHexStr2Byte(StringhexStr)if(hexStr.length()returnnul

22、l;byteresult=newbytehexStr.length()/2;for(inti=0;iinthigh=Integer.parseInt(hexStr.substring(i*2,i*2+l),16);intlow=IntegenparseInt(hexStnsubstring(i*2+l,i*2+2),16);returnresulti=(byte)(high*16+low);result;然后，我們再修訂以上測試代碼，如下:Stringcontent="test"Stringpassword="12345678”;加密System.out.prin

23、tln("加密前：''+content);byteencryptResult=encrypt(content,password);StringencryptResultStr=parseByte2HexStr(encryptResult);System.out.printing力口密后："+encryptResultStr);解密bytedecryptFrom=parseHexStr2Byte(encryptResultStr);bytedecryptResult=decrypt(decryptFrom,password);System.out.printl

24、n("解密后：H+newString(decryptResult);Stringcontent="test"Stringpassword=''12345678''加密System.out.printing'力口密前："+content);byteencryptResult=encrypt(content,password);StringencryptResultStr=parseByte2HexStr(encryptResult);System.out.println("力口密后："+encry

25、ptResultStr);解密bytedecryptFrom=parseHexStr2Byte(encryptResultStr);bytedecryptResult=decrypt(decryptFrom,password);System.out.printin("解密后："+newString(decryptResult);測試結(jié)果如下：加密前：test加密后：73C58BAFE578C59366D8C995CD0B9D6D解密后：test2.5另外一種加密方式還有一種加密方式，大家可以參考如下：/*加密*paramcontent需要加密的內(nèi)容param passwor

26、d 加密密碼return*/publicstaticbyteencrypt2(Stringcontent,Stringpassword)trySecretKeySpeckey=newSecretKeySpec(passwordegetBytes(),nAESn);Ciphercipher=Cipher.getInstance(HAES/ECB/NoPaddingn);bytebyteContent=content.getBytes(11utf-8M);cipher.init(Cipher.ENCRYPT_MODE,key);/初始化byteresult=cipher.doFinal(byteC

27、ontent);returnresult;/力口密catch(NoSuchAlgorithmExceptione)eeprintStackTrace();catch(NoSuchPaddingExceptione)eeprintStackTrace();catch(InvalidKeyExceptione)eeprintStackTrace();catch(UnsupportedEncodingExceptione)eeprintStackTrace();catch(IllegalBlockSizeExceptione)e>printStackTrace();catch(BadPaddingExceptione)eeprintStackTrace();returnnull;/*加密*paramcontent需要加密的內(nèi)param password 加密密碼* ©return */publicstaticbyteencrypt2(Stringcontent,Stringpassword)trySecretKeySpeckey=newSecretKeySpec(passwordegetBytes(),nAESf,);Ciphercipher=Cipher.g