鎽?瑕?/strong>錛氭湰鏂囬鍏堝垎鏋愪簡Java婧愪唬鐮侀渶瑕佸姞瀵嗙殑鍘熷洜錛岀畝瑕佷粙緇嶄簡DES綆楁硶鍙奐ava瀵嗙爜浣撶郴鍜孞ava瀵嗙爜鎵╁睍錛屾渶鍚庤鏄庝簡鍒╃敤DES鍔犲瘑綆楁硶淇濇姢Java婧愪唬鐮佺殑鏂規硶鍙婃楠ゃ?br />
銆銆鍏抽敭璇?/strong> Java 鍔犲瘑 DES綆楁硶
銆銆Java璇█鏄竴縐嶉潪甯擱傜敤浜?a class="bluekey" target="_blank">緗戠粶緙栫▼鐨勮璦錛屽畠鐨勫熀鏈粨鏋勪笌C++鏋佷負鐩鎬技錛屼絾鎶涘純浜?a class="bluekey" target="_blank">C/C++涓寚閽堢瓑鍐呭錛屽悓鏃跺畠鍚告敹浜哠malltalk銆丆++闈㈠悜瀵硅薄鐨勭紪紼嬫濇兂銆傚畠鍏鋒湁綆鍗曟с侀瞾媯掓с佸彲縐繪鎬с佸姩鎬佹х瓑鐗圭偣銆傝繖浜涚壒鐐逛嬌寰桱ava鎴愪負璺ㄥ鉤鍙板簲鐢ㄥ紑鍙戠殑涓縐嶈鑼冿紝鍦ㄤ笘鐣岃寖鍥村唴騫挎硾嫻佷紶銆?br />
銆銆鍔犲瘑Java婧愮爜鐨勫師鍥?/strong>
銆銆Java婧愪唬鐮佺粡榪囩紪璇戜互鍚庡湪JVM涓墽琛屻傜敱浜嶫VM鐣岄潰鏄畬鍏ㄩ忔槑鐨勶紝Java綾?/font>鏂囦歡鑳藉寰堝鏄撻氳繃鍙嶇紪璇?/font>鍣ㄩ噸鏂拌漿鎹㈡垚婧愪唬鐮併傚洜姝わ紝鎵鏈夌殑綆楁硶銆佺被鏂囦歡絳夐兘鍙互浠ユ簮浠ｇ爜鐨勫艦寮忚鍏紑錛屼嬌寰楄蔣浠朵笉鑳藉彈鍒頒繚鎶わ紝涓轟簡淇濇姢浜ф潈錛屼竴鑸彲浠ユ湁浠ヤ笅鍑犵鏂規硶錛?br />
銆銆錛?錛?妯＄硦"綾繪枃浠訛紝鍔犲ぇ鍙?a class="bluekey" target="_blank">緙栬瘧鍣?/font>鍙嶇紪璇戞簮浠ｇ爜鏂囦歡鐨勯毦搴︺傜劧鑰岋紝鍙互淇敼鍙嶇紪璇戝櫒錛屼嬌涔嬭兘澶熷鐞嗚繖浜涙ā緋婄被鏂囦歡銆傛墍浠ヤ粎浠呬緷璧?妯＄硦綾繪枃浠?鏉ヤ繚璇佷唬鐮佺殑瀹夊叏鏄笉澶熺殑銆?br />
銆銆錛?錛夋祦琛岀殑鍔犲瘑宸ュ叿瀵?a class="bluekey" target="_blank">婧愭枃浠?/font>榪涜鍔犲瘑錛屾瘮濡?a class="bluekey" target="_blank">PGP錛?a class="bluekey" target="_blank">Pretty Good Privacy錛夋垨GPG錛?a class="bluekey" target="_blank">GNU Privacy Guard錛夈傝繖鏃訛紝鏈緇堢敤鎴峰湪榪愯搴旂敤涔嬪墠蹇呴』鍏堣繘琛?a class="bluekey" target="_blank">瑙ｅ瘑銆備絾瑙ｅ瘑涔嬪悗錛屾渶緇堢敤鎴峰氨鏈変簡涓浠戒笉鍔犲瘑鐨勭被鏂囦歡錛岃繖鍜屼簨鍏堜笉榪涜鍔犲瘑娌℃湁浠涔堝樊鍒?br />
銆銆錛?錛夊姞瀵嗙被鏂囦歡錛屽湪榪愯涓璊VM鐢ㄥ畾鍒剁殑綾昏杞藉櫒錛圕lass Loader錛夎В瀵嗙被鏂囦歡銆侸ava榪愯鏃惰鍏ュ瓧鑺傜爜鐨勬満鍒墮殣鍚湴鎰忓懗鐫鍙互瀵瑰瓧鑺傜爜榪涜淇敼銆侸VM姣忔瑁呭叆綾繪枃浠舵椂閮介渶瑕佷竴涓О涓篊lassLoader鐨勫璞★紝榪欎釜瀵硅薄璐熻矗鎶婃柊鐨勭被瑁呭叆姝ｅ湪榪愯鐨凧VM銆侸VM緇機lassLoader涓涓寘鍚簡寰呰鍏ョ被錛堜緥濡俲ava.lang.Object錛夊悕瀛楃殑瀛楃涓詫紝鐒跺悗鐢盋lassLoader璐熻矗鎵懼埌綾繪枃浠訛紝瑁呭叆鍘熷鏁版嵁錛屽茍鎶婂畠杞崲鎴愪竴涓狢lass瀵硅薄銆?br />
銆銆鐢ㄦ埛涓嬭澆鐨勬槸鍔犲瘑榪囩殑綾繪枃浠訛紝鍦ㄥ姞瀵嗙被鏂囦歡瑁呭叆涔嬫椂榪涜瑙ｅ瘑錛屽洜姝ゅ彲浠ョ湅鎴愭槸涓縐嶅嵆鏃惰В瀵嗗櫒銆傜敱浜庤В瀵嗗悗鐨勫瓧鑺傜爜鏂囦歡姘歌繙涓嶄細淇濆瓨鍒?a class="bluekey" target="_blank">鏂囦歡緋葷粺錛屾墍浠?a class="bluekey" target="_blank">紿冨瘑鑰呭緢闅懼緱鍒拌В瀵嗗悗鐨勪唬鐮併?
銆銆鐢變簬鎶婂師濮嬪瓧鑺傜爜杞崲鎴怌lass瀵硅薄鐨勮繃紼嬪畬鍏ㄧ敱緋葷粺璐熻矗錛屾墍浠ュ垱寤哄畾鍒禖lassLoader瀵硅薄鍏跺疄騫朵笉鍥伴毦錛屽彧闇鍏堣幏寰楀師濮嬫暟鎹紝鎺ョ潃灝卞彲浠ヨ繘琛屽寘鍚В瀵嗗湪鍐呯殑浠諱綍杞崲銆?br />
銆銆Java瀵嗙爜浣撶郴鍜孞ava瀵嗙爜鎵╁睍
銆銆Java瀵嗙爜浣撶郴(JCA)鍜孞ava瀵嗙爜鎵╁睍(JCE)鐨勮璁＄洰鐨勬槸涓篔ava鎻愪緵涓庡疄鐜版棤鍏崇殑鍔犲瘑鍑芥暟API銆傚畠浠兘鐢╢actory鏂規硶鏉ュ垱寤虹被鐨勪緥紼嬶紝鐒跺悗鎶婂疄闄呯殑鍔犲瘑鍑芥暟濮旀墭緇欐彁渚涜呮寚瀹氱殑搴曞眰寮曟搸,寮曟搸涓負綾繪彁渚涗簡鏈嶅姟鎻愪緵鑰呮帴鍙ｅ湪Java涓疄鐜版暟鎹殑鍔犲瘑/瑙ｅ瘑錛屾槸浣跨敤鍏跺唴緗殑JCE(Java鍔犲瘑鎵╁睍)鏉ュ疄鐜扮殑銆?a class="bluekey" target="_blank">Java寮鍙?/font>宸ュ叿闆?.1涓哄疄鐜板寘鎷?a class="bluekey" target="_blank">鏁板瓧絳懼悕鍜屼俊鎭憳瑕佸湪鍐呯殑鍔犲瘑鍔熻兘錛屾帹鍑轟簡涓縐嶅熀浜庝緵搴斿晢鐨勬柊鍨嬬伒媧誨簲鐢ㄧ紪紼嬫帴鍙ｃ侸ava瀵嗙爜浣撶郴緇撴瀯鏀寔渚涘簲鍟嗙殑浜掓搷浣?鍚屾椂鏀寔紜歡鍜岃蔣浠跺疄鐜般?br />
銆銆Java瀵嗙爜瀛?a class="bluekey" target="_blank">緇撴瀯璁捐閬靛驚涓や釜鍘熷垯:
銆銆(1)綆楁硶鐨勭嫭绔嬫у拰鍙潬鎬с?br />
銆銆(2)瀹炵幇鐨勭嫭绔嬫у拰鐩鎬簰浣滅敤鎬с?br />
銆銆綆楁硶鐨勭嫭绔嬫ф槸閫氳繃瀹氫箟瀵嗙爜鏈嶅姟綾繪潵鑾峰緱銆傜敤鎴峰彧闇浜嗚В瀵嗙爜綆楁硶鐨勬蹇?鑰屼笉鐢ㄥ幓鍏沖績濡備綍瀹炵幇榪欎簺姒傚康銆傚疄鐜扮殑鐙珛鎬у拰鐩鎬簰浣滅敤鎬ч氳繃瀵嗙爜鏈嶅姟鎻愪緵鍣ㄦ潵瀹炵幇銆傚瘑鐮佹湇鍔℃彁渚涘櫒鏄疄鐜頒竴涓垨澶氫釜瀵嗙爜鏈嶅姟鐨勪竴涓垨澶氫釜紼嬪簭鍖呫傝蔣浠跺紑鍙戝晢鏍規嵁涓瀹氭帴鍙?灝嗗悇縐嶇畻娉曞疄鐜板悗,鎵撳寘鎴愪竴涓彁渚涘櫒,鐢ㄦ埛鍙互瀹夎涓嶅悓鐨勬彁渚涘櫒銆傚畨瑁呭拰閰嶇疆鎻愪緵鍣?鍙皢鍖呭惈鎻愪緵鍣ㄧ殑ZIP鍜?a class="bluekey" target="_blank">JAR鏂囦歡鏀懼湪CLASSPATH涓?鍐嶇紪杈慗ava瀹夊叏灞炴ф枃浠舵潵璁劇疆瀹氫箟涓涓彁渚涘櫒銆侸ava榪愯鐜Sun鐗堟湰鏃? 鎻愪緵涓涓己鐪佺殑鎻愪緵鍣⊿un銆?br />
銆銆涓嬮潰浠嬬粛DES綆楁硶鍙婂浣曞埄鐢―ES綆楁硶鍔犲瘑鍜岃В瀵?/font>綾繪枃浠剁殑姝ラ銆?br />
銆銆DES綆楁硶綆浠?/strong>
銆銆DES錛?a class="bluekey" target="_blank">Data Encryption Standard錛夋槸鍙戞槑鏈鏃╃殑鏈騫挎硾浣跨敤鐨勫垎緇勫縐板姞瀵嗙畻娉曘侱ES綆楁硶鐨勫叆鍙ｅ弬鏁版湁涓変釜錛?a class="bluekey" target="_blank">Key銆?a class="bluekey" target="_blank">Data銆丮ode銆傚叾涓?a class="bluekey" target="_blank">Key涓?涓瓧鑺傚叡64浣嶏紝鏄疍ES綆楁硶鐨勫伐浣滃瘑閽ワ紱Data涔熶負8涓瓧鑺?4浣嶏紝鏄琚姞瀵嗘垨琚В瀵嗙殑鏁版嵁錛汳ode涓篋ES鐨勫伐浣滄柟寮忥紝鏈変袱縐嶏細鍔犲瘑鎴栬В瀵嗐?br />
銆銆DES綆楁硶宸ヤ綔嫻佺▼濡備笅錛氳嫢Mode涓哄姞瀵嗘ā寮忥紝鍒欏埄鐢↘ey 瀵規暟鎹瓺ata榪涜鍔犲瘑錛?鐢熸垚Data鐨勫瘑鐮佸艦寮忥紙64浣嶏級浣滀負DES鐨勮緭鍑虹粨鏋滐紱濡侻ode涓鴻В瀵嗘ā寮忥紝鍒欏埄鐢↘ey瀵瑰瘑鐮佸艦寮忕殑鏁版嵁Data榪涜瑙ｅ瘑錛岃繕鍘熶負Data鐨勬槑鐮佸艦寮忥紙64浣嶏級浣滀負DES鐨勮緭鍑虹粨鏋溿傚湪閫氫俊緗?/font>緇滅殑涓ょ錛屽弻鏂圭害瀹氫竴鑷寸殑Key錛屽湪閫氫俊鐨勬簮鐐圭敤Key瀵規牳蹇冩暟鎹繘琛孌ES鍔犲瘑錛岀劧鍚庝互瀵嗙爜褰㈠紡鍦ㄥ叕鍏遍氫俊緗戯紙濡?a class="bluekey" target="_blank">鐢佃瘽緗?/font>錛変腑浼犺緭鍒?a class="bluekey" target="_blank">閫氫俊緗戠粶鐨勭粓鐐癸紝鏁版嵁鍒拌揪鐩殑鍦板悗錛岀敤鍚屾牱鐨凨ey瀵瑰瘑鐮佹暟鎹繘琛岃В瀵嗭紝渚垮啀鐜頒簡鏄庣爜褰㈠紡鐨勬牳蹇冩暟鎹傝繖鏍鳳紝渚夸繚璇佷簡鏍稿績鏁版嵁鍦ㄥ叕鍏遍氫俊緗戜腑浼犺緭鐨勫畨鍏ㄦу拰鍙潬鎬с?br />
銆銆涔熷彲浠ラ氳繃瀹氭湡鍦ㄩ氫俊緗戠粶鐨勬簮绔拰鐩殑绔悓鏃舵敼鐢ㄦ柊鐨凨ey錛屼究鑳芥洿榪涗竴姝ユ彁楂樻暟鎹殑淇濆瘑鎬с?br />鍒╃敤DES綆楁硶鍔犲瘑鐨勬楠?br />
銆銆錛?錛夌敓鎴愪竴涓畨鍏ㄥ瘑閽ャ傚湪鍔犲瘑鎴栬В瀵嗕換浣曟暟鎹箣鍓嶉渶瑕佹湁涓涓瘑閽ャ傚瘑閽ユ槸闅忓悓琚姞瀵嗙殑搴旂敤紼嬪簭涓璧峰彂甯冪殑涓孌墊暟鎹紝瀵嗛挜浠ｇ爜濡備笅鎵紺恒?br />
銆銆銆愮敓鎴愪竴涓瘑閽ヤ唬鐮併?br />
//
鐢熸垚涓涓彲淇′換鐨勯殢鏈烘暟婧?/span>
Secure Random sr
=
new
SecureRandom();
//
涓烘垜浠夋嫨鐨凞ES綆楁硶鐢熸垚涓涓狵eyGenerator瀵硅薄
KeyGenerator kg
=
KeyGenerator.getInstance (
"
DES
"
);Kg.init (sr);
//
鐢熸垚瀵嗛挜
Secret Key key
=
kg.generateKey();
//
灝嗗瘑閽ユ暟鎹繚瀛樹負鏂囦歡渚涗互鍚庝嬌鐢紝鍏朵腑key Filename涓轟繚瀛樼殑鏂囦歡鍚?/span>
Util.writeFile (key Filename, key.getEncoded () );
2錛夊姞瀵嗘暟鎹傚緱鍒板瘑閽ヤ箣鍚庯紝鎺ヤ笅鏉ュ氨鍙互鐢ㄥ畠鍔犲瘑鏁版嵁銆傚涓嬫墍紺恒?br />
銆銆銆愮敤瀵嗛挜鍔犲瘑鍘熷鏁版嵁銆?br />
// 浜х敓涓涓彲淇′換鐨勯殢鏈烘暟婧?/span>SecureRandom sr = new SecureRandom();//浠庡瘑閽ユ枃浠秌ey Filename涓緱鍒板瘑閽ユ暟鎹?/span>Byte rawKeyData [] = Util.readFile (key Filename);// 浠庡師濮嬪瘑閽ユ暟鎹垱寤篋ESKeySpec瀵硅薄DESKeySpec dks = new DESKeySpec (rawKeyData);// 鍒涘緩涓涓瘑閽ュ伐鍘傦紝鐒跺悗鐢ㄥ畠鎶奃ESKeySpec杞崲鎴怱ecret Key瀵硅薄SecretKeyFactory key Factory = SecretKeyFactory.getInstance("DES" );Secret Key key = keyFactory.generateSecret( dks );// Cipher瀵硅薄瀹為檯瀹屾垚鍔犲瘑鎿嶄綔Cipher cipher = Cipher.getInstance( "DES" );// 鐢ㄥ瘑閽ュ垵濮嬪寲Cipher瀵硅薄cipher.init( Cipher.ENCRYPT_MODE, key, sr );// 閫氳繃璇葷被鏂囦歡鑾峰彇闇瑕佸姞瀵嗙殑鏁版嵁Byte data [] = Util.readFile (filename);// 鎵ц鍔犲瘑鎿嶄綔Byte encryptedClassData [] = cipher.doFinal(data );// 淇濆瓨鍔犲瘑鍚庣殑鏂囦歡錛岃鐩栧師鏈夌殑綾繪枃浠躲?#160;Util.writeFile( filename, encryptedClassData );銆銆銆愮敤瀵嗛挜瑙ｅ瘑鏁版嵁銆?br />
// 鐢熸垚涓涓彲淇′換鐨勯殢鏈烘暟婧?/span>SecureRandom sr = new SecureRandom();// 浠庡瘑閽ユ枃浠朵腑鑾峰彇鍘熷瀵嗛挜鏁版嵁Byte rawKeyData[] = Util.readFile( keyFilename );// 鍒涘緩涓涓狣ESKeySpec瀵硅薄DESKeySpec dks = new DESKeySpec (rawKeyData);// 鍒涘緩涓涓瘑閽ュ伐鍘傦紝鐒跺悗鐢ㄥ畠鎶奃ESKeySpec瀵硅薄杞崲鎴怱ecret Key瀵硅薄 SecretKeyFactory key Factory = SecretKeyFactory.getInstance( "DES" );SecretKey key = keyFactory.generateSecret( dks );// Cipher瀵硅薄瀹為檯瀹屾垚瑙ｅ瘑鎿嶄綔Cipher cipher = Cipher.getInstance( "DES" );// 鐢ㄥ瘑閽ュ垵濮嬪寲Cipher瀵硅薄Cipher.init( Cipher.DECRYPT_MODE, key, sr );// 鑾峰緱緇忚繃鍔犲瘑鐨勬暟鎹?/span>Byte encrypted Data [] = Util.readFile (Filename);//鎵ц瑙ｅ瘑鎿嶄綔Byte decryptedData [] = cipher.doFinal( encryptedData );// 鐒跺悗灝嗚В瀵嗗悗鐨勬暟鎹漿鍖栨垚鍘熸潵鐨勭被鏂囦歡銆?/span>銆銆緇撴潫璇?/font>
銆銆鍔犲瘑/瑙ｅ瘑鏄暟鎹紶杈撲腑淇濊瘉鏁版嵁瀹夊叏鎬у拰瀹屾暣鎬х殑甯哥敤鏂規硶錛孞ava璇█鍥犲叾騫沖彴鏃犲叧鎬э紝鍦↖nternet涓婄殑搴旂敤闈炲父涔嬪箍娉涖備嬌鐢―ES綆楁硶鍔犲瘑Java婧愮爜鍦ㄤ竴瀹氱▼搴︿笂鑳戒繚鎶よ蔣浠剁殑浜ф潈銆?
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