Posted on 2008-05-23 23:21
acooly 閱讀(532)
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package?org.acooly.studio.encrypt;
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import?java.security.Key;
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import?javax.crypto.Cipher;
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import?javax.crypto.KeyGenerator;
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import?javax.crypto.SecretKey;
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import?javax.crypto.spec.IvParameterSpec;
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import?javax.crypto.spec.SecretKeySpec;
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import?org.apache.commons.logging.Log;
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import?org.apache.commons.logging.LogFactory;
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/**
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?*?對稱加密JAVA算法演示(JAVA-SUN?API實現)
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?*?
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?*?
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?*?@author?pu.zhang
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?*?
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?*/
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public?class?SymmetricEncryption?{
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????private?Log?logger?=?LogFactory.getLog(SymmetricEncryption.class);
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????public?static?void?main(String[]?args)?throws?Exception?{
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????????SymmetricEncryption?symmetricEncryption?=?new?SymmetricEncryption();
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????????//?DES
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????????symmetricEncryption.DESEncryption();
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????????//?3DES
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????????symmetricEncryption.tripleDESEncryption();
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????}
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????/**
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?????*?DES加/解密演示
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?????*?
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?????*?@throws?Exception
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?????*/
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????void?DESEncryption()?throws?Exception?{
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????????//?明文
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????????byte[]?plainText?=?"I?am?plain?text!".getBytes();
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????????logger.info("明文:"?+?formatedHexString(plainText));
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????????//?通過KeyGenerator形成一個key
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????????KeyGenerator?keyGenerator?=?KeyGenerator.getInstance("DES");
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????????Key?key?=?keyGenerator.generateKey();
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????????logger.info("KEY:"?+?formatedHexString(key.getEncoded()));
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????????//?獲得一個私鑰加密類Cipher，CBC是加密方式，PKCS5Padding是填充方法
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????????//?CBC加密方式：把明文分為左右兩部分LP和RP
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????????String?transformation?=?"DES/CBC/PKCS5Padding";?//?algorithm/mode/padding
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????????Cipher?cipher?=?Cipher.getInstance(transformation);
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????????//?CBC方式的初始化向量
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????????byte[]?iv?=?"iamaniv.".getBytes();
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????????IvParameterSpec?ivparam?=?new?IvParameterSpec(iv);
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????????//?加密
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????????cipher.init(Cipher.ENCRYPT_MODE,?key,?ivparam);
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????????byte[]?cipherText?=?cipher.doFinal(plainText);
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????????logger.info("加密后密文:"?+?formatedHexString(cipherText));
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????????//?解密
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????????cipher.init(Cipher.DECRYPT_MODE,?key,?ivparam);
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????????byte[]?newPlainText?=?cipher.doFinal(cipherText);
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????????logger.info("解密后明文:"?+?formatedHexString(newPlainText));
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????}
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????/**
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?????*?DES加/解密演示
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?????*?
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?????*?@throws?Exception
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?????*/
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????void?tripleDESEncryption()?throws?Exception?{
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????????//?24字節密鑰key,3倍DES密鑰長度
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????????byte[]?tripleKey?=?"123456789012345678901234".getBytes();
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????????logger.info("tripleKey:"?+?formatedHexString(tripleKey));
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????????//?明文
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????????byte[]?plainText?=?"I?am?plain?text!".getBytes();
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????????logger.info("初始的明文:"?+?formatedHexString(plainText));
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????????//?算法
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????????String?algorithm?=?"DESede";
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????????//?生成密鑰
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????????SecretKey?secretKey?=?new?SecretKeySpec(tripleKey,?algorithm);
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????????String?transformation?=?"DESede/CBC/PKCS5Padding";
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????????Cipher?cipher?=?Cipher.getInstance(transformation);
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????????//?CBC方式的初始化向量
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????????byte[]?iv?=?"iamaniv.".getBytes();
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????????IvParameterSpec?ivparam?=?new?IvParameterSpec(iv);
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????????//?加密
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????????cipher.init(Cipher.ENCRYPT_MODE,?secretKey,?ivparam);
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????????byte[]?encriptText?=?cipher.doFinal(plainText);
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????????logger.info("加密的密文:"?+?formatedHexString(encriptText));
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????????//?解密碼
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????????cipher.init(Cipher.DECRYPT_MODE,?secretKey,?ivparam);
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????????byte[]?newPlainText?=?cipher.doFinal(encriptText);
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????????logger.info("解密的明文:"?+?formatedHexString(newPlainText));
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????}
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????
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????/**
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?????*?轉換byte數組為16進制的字符串顯示方式
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?????*?@param?b
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?????*?@return
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?????*/
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????String?formatedHexString(byte[]?b)?{
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????????String?hs?=?"";
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????????String?stmp?=?"";
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????????for?(int?n?=?0;?n?<?b.length;?n++)?{
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????????????stmp?=?(java.lang.Integer.toHexString(b[n]?&?0XFF));
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????????????if?(stmp.length()?==?1)
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????????????????hs?=?hs?+?"0"?+?stmp;
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????????????else
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????????????????hs?=?hs?+?stmp;
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????????????if?(n?<?b.length?-?1)
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????????????????hs?=?hs?+?"?";
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????????}
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????????return?hs.toUpperCase();
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????}
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}
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