java實(shí)現(xiàn)MD5加密

1、public class MDSUtil private -tatlc final String j5MZS77”0123456789ABCDEF”； private static final Integer SALT LENGTH = 12;*將16進(jìn)制字符串轉(zhuǎn)換成字節(jié)數(shù)組* gparam hex* 6returnpublic static bytehexStringToByt(String hex)lilt len = (hex.length() / 2);byte result = new bytelen;char hexChars = hex.toCharArray();for (in

2、t i = 0; i < len; i+) int pos = i * 2;result i = (byte) HEX_NUMS_STR. indexOf (hexChars pos) «I HEX_NUMS_STR.ixdexQt (hexChars pos + 1); return result;*將拆定byte數(shù)組轉(zhuǎn)換成16進(jìn)制寧符串* gp&ram b* returnpublic static String byteToHexString(byte b) StringBuffer hexString = new StringBuffer(); for (int

3、i = 0; i < b.length; i+) String hex = Integer. toHexString& OxFF); if (hex.length() = 1) hex = 101 + hex; hexString.append(hex.toUpperCase();ratum hexString. toString ();/ *驗(yàn)證11令是否合法* param password* gp&ran passwordlnDb* 6return* gthrows NoSuchAlgorithmException* 6throws UnsupportedEncodi

4、ngException*/public static boolean validPasswcrd(String password, String passwordlnDb)throwsNoSuchAlgorithmException/UnsupportedEncodingException / /將16進(jìn)制字符串格式11令轉(zhuǎn)換成字節(jié)數(shù)組byte pwdlnDb =(passwordlnDb);/聲明鹽變螢byte salt = new byte SALT_LENGTH;/將鹽從數(shù)據(jù)庫(kù)中保存的【I令字節(jié)數(shù)組屮提取出來(lái)System. arraycopyipvjdlnDb, 0z salt, 0r

5、SALT_LENGTH;/創(chuàng)建消息摘要對(duì)彖MessageDigest md = MessageDigest. getlnstanceS;/將鹽數(shù)據(jù)傳入消息摘耍對(duì)彖md.update(salt);/將11令的數(shù)據(jù)傳給消息摘耍對(duì)象md.update (password.getBytes (,fUTF-8n);/生成輸入口令的消息摘耍byte digest = md.digest();/聲明一個(gè)保存數(shù)據(jù)庫(kù)中口令消息摘耍的變量byt« digestlnDb = mw byte pwdlnDb. length - SALT_LENGTH;/取得數(shù)據(jù)庫(kù)中口令的消息摘耍一System, array

6、copy(pwdInDb,SALT_LENGTH9digestlnDb 0,digestlnDb.length);/比較根據(jù)輸入11令生成的消息摘要和數(shù)據(jù)庫(kù)中消息摘耍是否相同 if (Arrays . <?vum_Zs(digest, digestlnDb) /口令正確返回口令匹配消息return true; /口令不正確返回口令不匹配消息return false;*獲得加密后的16進(jìn)制形式口令* Sparam password* 6return* throws NoSuchAlgorithmException* throws UnsupportedEncodingException*/

7、public static String getEncryptedPwd(String password)throwsNoSuchAlgorithmException,UnsupportedEncodingException /聲明加密后的口令數(shù)組變量byte pwd = null;/隨機(jī)數(shù)生成器SecureRandom random = new SecureRandom();/聲明鹽數(shù)組變量byt« salt = naw byte SALT_LENGTH;/將隨機(jī)數(shù)放入鹽變最中一random.nextBytes(salt);/聲明消息摘要對(duì)象MessageDigest md = n

8、ull;/創(chuàng)建消息摘要md = MessageDigest. get!nstance(vMD5u);/將鹽數(shù)據(jù)傳入消息摘要對(duì)象md.update(salt);/將口令的數(shù)據(jù)傳給消息摘要對(duì)線md.update (password.getBytes (,fUTF-8lf);/獲得消息摘要的字節(jié)數(shù)組byte digest = md.digest();/因?yàn)樗Ｔ?令的字節(jié)數(shù)組中存放鹽，所以加上鹽的字節(jié)氏度pwd = new byte digest. length + SALT_LENGTH;/將鹽的字節(jié)拷貝到生成的加密11令字節(jié)數(shù)組個(gè)字節(jié)，以便在驗(yàn)證11令時(shí) 取出鹽System, arraycopy(sdilt, 0, pwd, 0, SALT_LENGTH);/將消息摘要拷貝到加密【I令字節(jié)數(shù)組從第13個(gè)字節(jié)開始的字節(jié)System, arraycopy (digest, 0f pwd, SALT_LENGTH. digest. length);/將字節(jié)數(shù)組格式加密后的LI令轉(zhuǎn)化為16進(jìn)制字祜串格式的l I令return byteToHexString (pwd);public static void main(String args) throwsNoSuchAlgorithmException, UnsupportedEncodingException System