??1?/************************************************
??2?MD5?算法的Java?Bean
??3?@author:Topcat?Tuppin
??4?Last?Modified:10,Mar,2001
??5?*************************************************/
??6?import?java.lang.reflect.*;
??7?/*************************************************
??8?md5?類實現了RSA?Data?Security,?Inc.在提交給IETF
??9?的RFC1321中的MD5?message-digest?算法。
?10?*************************************************/
?11?
?12?public?class?MD5?{
?13?????/*?下面這些S11-S44實際上是一個4*4的矩陣，在原始的C實現中是用#define?實現的，
?14?????這里把它們實現成為static?final是表示了只讀，切能在同一個進程空間內的多個
?15?????Instance間共享*/
?16?????????static?final?int?S11?=?7;
?17?????????static?final?int?S12?=?12;
?18?????????static?final?int?S13?=?17;
?19?????????static?final?int?S14?=?22;
?20?
?21?????????static?final?int?S21?=?5;
?22?????????static?final?int?S22?=?9;
?23?????????static?final?int?S23?=?14;
?24?????????static?final?int?S24?=?20;
?25?
?26?????????static?final?int?S31?=?4;
?27?????????static?final?int?S32?=?11;
?28?????????static?final?int?S33?=?16;
?29?????????static?final?int?S34?=?23;
?30?
?31?????????static?final?int?S41?=?6;
?32?????????static?final?int?S42?=?10;
?33?????????static?final?int?S43?=?15;
?34?????????static?final?int?S44?=?21;
?35?
?36?????????static?final?byte[]?PADDING?=?{?-128,?0,?0,?0,?0,?0,?0,?0,?0,
?37?????????0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,
?38?????????0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,
?39?????????0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0,?0?};
?40?????????/*?下面的三個成員是MD5計算過程中用到的3個核心數據，在原始的C實現中
?41????????????被定義到MD5_CTX結構中
?42?????????
?43??????????*/
?44?????????private?long[]?state?=?new?long[4];??//?state?(ABCD)
?45?????????private?long[]?count?=?new?long[2];??//?number?of?bits,?modulo?2^64?(lsb?first)
?46?????????private?byte[]?buffer?=?new?byte[64];?//?input?buffer
?47?????????
?48?????/*?digestHexStr是MD5的唯一一個公共成員，是最新一次計算結果的
?49????? ?16進制ASCII表示.
?50?????*/
?51?????????public?String?digestHexStr;
?52?????????
?53?????????/*?digest,是最新一次計算結果的2進制內部表示，表示128bit的MD5值.
?54?????*/
?55?????????private?byte[]?digest?=?new?byte[16];
?56?????????
?57?????/*
?58???????getMD5ofStr是類MD5最主要的公共方法，入口參數是你想要進行MD5變換的字符串
?59???????返回的是變換完的結果，這個結果是從公共成員digestHexStr取得的．
?60?????*/
?61?????????public?String?getMD5ofStr(String?inbuf)?{
?62?????????????????md5Init();
?63?????????????????md5Update(inbuf.getBytes(),?inbuf.length());
?64?????????????????md5Final();
?65?????????????????digestHexStr?=?"";
?66?????????????????for?(int?i?=?0;?i?<?16;?i++)?{
?67?????????????????????????digestHexStr?+=?byteHEX(digest[i]);
?68?????????????????}
?69?????????????????return?digestHexStr;
?70?
?71?????????}
?72?????????//?這是MD5這個類的標準構造函數，JavaBean要求有一個public的并且沒有參數的構造函數
?73?????????public?MD5()?{
?74?????????????????md5Init();
?75?
?76?????????????????return;
?77?????????}
?78?????????
?79?
?80?
?81?????????/*?md5Init是一個初始化函數，初始化核心變量，裝入標準的幻數?*/
?82?????????private?void?md5Init()?{
?83?????????????????count[0]?=?0L;
?84?????????????????count[1]?=?0L;
?85?????????????????///*?Load?magic?initialization?constants.
?86?
?87?????????????????state[0]?=?0x67452301L;
?88?????????????????state[1]?=?0xefcdab89L;
?89?????????????????state[2]?=?0x98badcfeL;
?90?????????????????state[3]?=?0x10325476L;
?91?
?92?????????????????return;
?93?????????}
?94?????????/*?F,?G,?H?,I?是4個基本的MD5函數，在原始的MD5的C實現中，由于它們是
?95?????????簡單的位運算，可能出于效率的考慮把它們實現成了宏，在java中，我們把它們
?96?????? 實現成了private方法，名字保持了原來C中的。?*/
?97?
?98?????????private?long?F(long?x,?long?y,?long?z)?{
?99?????????????????return?(x?&?y)?|?((~x)?&?z);
100?
101?????????}
102?????????private?long?G(long?x,?long?y,?long?z)?{
103?????????????????return?(x?&?z)?|?(y?&?(~z));
104?
105?????????}
106?????????private?long?H(long?x,?long?y,?long?z)?{
107?????????????????return?x?^?y?^?z;
108?????????}
109?
110?????????private?long?I(long?x,?long?y,?long?z)?{
111?????????????????return?y?^?(x?|?(~z));
112?????????}
113?????????
114????????/*?
115???????????FF,GG,HH和II將調用F,G,H,I進行近一步變換
116???????????FF,?GG,?HH,?and?II?transformations?for?rounds?1,?2,?3,?and?4.
117???????????Rotation?is?separate?from?addition?to?prevent?recomputation.
118????????*/??
119?
120?????????private?long?FF(long?a,?long?b,?long?c,?long?d,?long?x,?long?s,
121?????????????????long?ac)?{
122?????????????????a?+=?F?(b,?c,?d)?+?x?+?ac;
123?????????????????a?=?((int)?a?<<?s)?|?((int)?a?>>>?(32?-?s));
124?????????????????a?+=?b;
125?????????????????return?a;
126?????????}
127?
128?????????private?long?GG(long?a,?long?b,?long?c,?long?d,?long?x,?long?s,
129?????????????????long?ac)?{
130?????????????????a?+=?G?(b,?c,?d)?+?x?+?ac;
131?????????????????a?=?((int)?a?<<?s)?|?((int)?a?>>>?(32?-?s));
132?????????????????a?+=?b;
133?????????????????return?a;
134?????????}
135?????????private?long?HH(long?a,?long?b,?long?c,?long?d,?long?x,?long?s,
136?????????????????long?ac)?{
137?????????????????a?+=?H?(b,?c,?d)?+?x?+?ac;
138?????????????????a?=?((int)?a?<<?s)?|?((int)?a?>>>?(32?-?s));
139?????????????????a?+=?b;
140?????????????????return?a;
141?????????}
142?????????private?long?II(long?a,?long?b,?long?c,?long?d,?long?x,?long?s,
143?????????????????long?ac)?{
144?????????????????a?+=?I?(b,?c,?d)?+?x?+?ac;
145?????????????????a?=?((int)?a?<<?s)?|?((int)?a?>>>?(32?-?s));
146?????????????????a?+=?b;
147?????????????????return?a;
148?????????}
149?????????/*
150??????????md5Update是MD5的主計算過程，inbuf是要變換的字節串，inputlen是長度，這個
151??????????函數由getMD5ofStr調用，調用之前需要調用md5init，因此把它設計成private的
152?????????*/
153?????????private?void?md5Update(byte[]?inbuf,?int?inputLen)?{
154?
155?????????????????int?i,?index,?partLen;
156?????????????????byte[]?block?=?new?byte[64];
157?????????????????index?=?(int)(count[0]?>>>?3)?&?0x3F;
158?????????????????//?/*?Update?number?of?bits?*/
159?????????????????if?((count[0]?+=?(inputLen?<<?3))?<?(inputLen?<<?3))
160?????????????????????????count[1]++;
161?????????????????count[1]?+=?(inputLen?>>>?29);
162?
163?????????????????partLen?=?64?-?index;
164?
165?????????????????//?Transform?as?many?times?as?possible.
166?????????????????if?(inputLen?>=?partLen)?{
167?????????????????????????md5Memcpy(buffer,?inbuf,?index,?0,?partLen);
168?????????????????????????md5Transform(buffer);
169?
170?????????????????????????for?(i?=?partLen;?i?+?63?<?inputLen;?i?+=?64)?{
171?
172?????????????????????????????????md5Memcpy(block,?inbuf,?0,?i,?64);
173?????????????????????????????????md5Transform?(block);
174?????????????????????????}
175?????????????????????????index?=?0;
176?
177?????????????????}?else
178?
179?????????????????????????i?=?0;
180?
181?????????????????///*?Buffer?remaining?input?*/
182?????????????????md5Memcpy(buffer,?inbuf,?index,?i,?inputLen?-?i);
183?
184?????????}
185?????????
186?????????/*
187???????????md5Final整理和填寫輸出結果
188?????????*/
189?????????private?void?md5Final?()?{
190?????????????????byte[]?bits?=?new?byte[8];
191?????????????????int?index,?padLen;
192?
193?????????????????///*?Save?number?of?bits?*/
194?????????????????Encode?(bits,?count,?8);
195?
196?????????????????///*?Pad?out?to?56?mod?64.
197?????????????????index?=?(int)(count[0]?>>>?3)?&?0x3f;
198?????????????????padLen?=?(index?<?56)???(56?-?index)?:?(120?-?index);
199?????????????????md5Update?(PADDING,?padLen);
200?
201?????????????????///*?Append?length?(before?padding)?*/
202?????????????????md5Update(bits,?8);
203?
204?????????????????///*?Store?state?in?digest?*/
205?????????????????Encode?(digest,?state,?16);
206?
207?????????}
208??????????
209?????????/*?md5Memcpy是一個內部使用的byte數組的塊拷貝函數，從input的inpos開始把len長度的
210? ?字節拷貝到output的outpos位置開始?
211?????????*/
212?
213?????????private?void?md5Memcpy?(byte[]?output,?byte[]?input,
214?????????????????int?outpos,?int?inpos,?int?len)
215?????????{
216?????????????????int?i;
217?
218?????????????????for?(i?=?0;?i?<?len;?i++)
219?????????????????????????output[outpos?+?i]?=?input[inpos?+?i];
220?????????}
221?????????
222?????????/*
223????????????md5Transform是MD5核心變換程序，有md5Update調用，block是分塊的原始字節
224?????????*/
225?????????private?void?md5Transform?(byte?block[])?{
226?????????????????long?a?=?state[0],?b?=?state[1],?c?=?state[2],?d?=?state[3];
227?????????????????long[]?x?=?new?long[16];
228?
229?????????????????Decode?(x,?block,?64);
230?
231?????????????????/*?Round?1?*/
232?????????????????a?=?FF?(a,?b,?c,?d,?x[0],?S11,?0xd76aa478L);?/*?1?*/
233?????????????????d?=?FF?(d,?a,?b,?c,?x[1],?S12,?0xe8c7b756L);?/*?2?*/
234?????????????????c?=?FF?(c,?d,?a,?b,?x[2],?S13,?0x242070dbL);?/*?3?*/
235?????????????????b?=?FF?(b,?c,?d,?a,?x[3],?S14,?0xc1bdceeeL);?/*?4?*/
236?????????????????a?=?FF?(a,?b,?c,?d,?x[4],?S11,?0xf57c0fafL);?/*?5?*/
237?????????????????d?=?FF?(d,?a,?b,?c,?x[5],?S12,?0x4787c62aL);?/*?6?*/
238?????????????????c?=?FF?(c,?d,?a,?b,?x[6],?S13,?0xa8304613L);?/*?7?*/
239?????????????????b?=?FF?(b,?c,?d,?a,?x[7],?S14,?0xfd469501L);?/*?8?*/
240?????????????????a?=?FF?(a,?b,?c,?d,?x[8],?S11,?0x698098d8L);?/*?9?*/
241?????????????????d?=?FF?(d,?a,?b,?c,?x[9],?S12,?0x8b44f7afL);?/*?10?*/
242?????????????????c?=?FF?(c,?d,?a,?b,?x[10],?S13,?0xffff5bb1L);?/*?11?*/
243?????????????????b?=?FF?(b,?c,?d,?a,?x[11],?S14,?0x895cd7beL);?/*?12?*/
244?????????????????a?=?FF?(a,?b,?c,?d,?x[12],?S11,?0x6b901122L);?/*?13?*/
245?????????????????d?=?FF?(d,?a,?b,?c,?x[13],?S12,?0xfd987193L);?/*?14?*/
246?????????????????c?=?FF?(c,?d,?a,?b,?x[14],?S13,?0xa679438eL);?/*?15?*/
247?????????????????b?=?FF?(b,?c,?d,?a,?x[15],?S14,?0x49b40821L);?/*?16?*/
248?
249?????????????????/*?Round?2?*/
250?????????????????a?=?GG?(a,?b,?c,?d,?x[1],?S21,?0xf61e2562L);?/*?17?*/
251?????????????????d?=?GG?(d,?a,?b,?c,?x[6],?S22,?0xc040b340L);?/*?18?*/
252?????????????????c?=?GG?(c,?d,?a,?b,?x[11],?S23,?0x265e5a51L);?/*?19?*/
253?????????????????b?=?GG?(b,?c,?d,?a,?x[0],?S24,?0xe9b6c7aaL);?/*?20?*/
254?????????????????a?=?GG?(a,?b,?c,?d,?x[5],?S21,?0xd62f105dL);?/*?21?*/
255?????????????????d?=?GG?(d,?a,?b,?c,?x[10],?S22,?0x2441453L);?/*?22?*/
256?????????????????c?=?GG?(c,?d,?a,?b,?x[15],?S23,?0xd8a1e681L);?/*?23?*/
257?????????????????b?=?GG?(b,?c,?d,?a,?x[4],?S24,?0xe7d3fbc8L);?/*?24?*/
258?????????????????a?=?GG?(a,?b,?c,?d,?x[9],?S21,?0x21e1cde6L);?/*?25?*/
259?????????????????d?=?GG?(d,?a,?b,?c,?x[14],?S22,?0xc33707d6L);?/*?26?*/
260?????????????????c?=?GG?(c,?d,?a,?b,?x[3],?S23,?0xf4d50d87L);?/*?27?*/
261?????????????????b?=?GG?(b,?c,?d,?a,?x[8],?S24,?0x455a14edL);?/*?28?*/
262?????????????????a?=?GG?(a,?b,?c,?d,?x[13],?S21,?0xa9e3e905L);?/*?29?*/
263?????????????????d?=?GG?(d,?a,?b,?c,?x[2],?S22,?0xfcefa3f8L);?/*?30?*/
264?????????????????c?=?GG?(c,?d,?a,?b,?x[7],?S23,?0x676f02d9L);?/*?31?*/
265?????????????????b?=?GG?(b,?c,?d,?a,?x[12],?S24,?0x8d2a4c8aL);?/*?32?*/
266?
267?????????????????/*?Round?3?*/
268?????????????????a?=?HH?(a,?b,?c,?d,?x[5],?S31,?0xfffa3942L);?/*?33?*/
269?????????????????d?=?HH?(d,?a,?b,?c,?x[8],?S32,?0x8771f681L);?/*?34?*/
270?????????????????c?=?HH?(c,?d,?a,?b,?x[11],?S33,?0x6d9d6122L);?/*?35?*/
271?????????????????b?=?HH?(b,?c,?d,?a,?x[14],?S34,?0xfde5380cL);?/*?36?*/
272?????????????????a?=?HH?(a,?b,?c,?d,?x[1],?S31,?0xa4beea44L);?/*?37?*/
273?????????????????d?=?HH?(d,?a,?b,?c,?x[4],?S32,?0x4bdecfa9L);?/*?38?*/
274?????????????????c?=?HH?(c,?d,?a,?b,?x[7],?S33,?0xf6bb4b60L);?/*?39?*/
275?????????????????b?=?HH?(b,?c,?d,?a,?x[10],?S34,?0xbebfbc70L);?/*?40?*/
276?????????????????a?=?HH?(a,?b,?c,?d,?x[13],?S31,?0x289b7ec6L);?/*?41?*/
277?????????????????d?=?HH?(d,?a,?b,?c,?x[0],?S32,?0xeaa127faL);?/*?42?*/
278?????????????????c?=?HH?(c,?d,?a,?b,?x[3],?S33,?0xd4ef3085L);?/*?43?*/
279?????????????????b?=?HH?(b,?c,?d,?a,?x[6],?S34,?0x4881d05L);?/*?44?*/
280?????????????????a?=?HH?(a,?b,?c,?d,?x[9],?S31,?0xd9d4d039L);?/*?45?*/
281?????????????????d?=?HH?(d,?a,?b,?c,?x[12],?S32,?0xe6db99e5L);?/*?46?*/
282?????????????????c?=?HH?(c,?d,?a,?b,?x[15],?S33,?0x1fa27cf8L);?/*?47?*/
283?????????????????b?=?HH?(b,?c,?d,?a,?x[2],?S34,?0xc4ac5665L);?/*?48?*/
284?
285?????????????????/*?Round?4?*/
286?????????????????a?=?II?(a,?b,?c,?d,?x[0],?S41,?0xf4292244L);?/*?49?*/
287?????????????????d?=?II?(d,?a,?b,?c,?x[7],?S42,?0x432aff97L);?/*?50?*/
288?????????????????c?=?II?(c,?d,?a,?b,?x[14],?S43,?0xab9423a7L);?/*?51?*/
289?????????????????b?=?II?(b,?c,?d,?a,?x[5],?S44,?0xfc93a039L);?/*?52?*/
290?????????????????a?=?II?(a,?b,?c,?d,?x[12],?S41,?0x655b59c3L);?/*?53?*/
291?????????????????d?=?II?(d,?a,?b,?c,?x[3],?S42,?0x8f0ccc92L);?/*?54?*/
292?????????????????c?=?II?(c,?d,?a,?b,?x[10],?S43,?0xffeff47dL);?/*?55?*/
293?????????????????b?=?II?(b,?c,?d,?a,?x[1],?S44,?0x85845dd1L);?/*?56?*/
294?????????????????a?=?II?(a,?b,?c,?d,?x[8],?S41,?0x6fa87e4fL);?/*?57?*/
295?????????????????d?=?II?(d,?a,?b,?c,?x[15],?S42,?0xfe2ce6e0L);?/*?58?*/
296?????????????????c?=?II?(c,?d,?a,?b,?x[6],?S43,?0xa3014314L);?/*?59?*/
297?????????????????b?=?II?(b,?c,?d,?a,?x[13],?S44,?0x4e0811a1L);?/*?60?*/
298?????????????????a?=?II?(a,?b,?c,?d,?x[4],?S41,?0xf7537e82L);?/*?61?*/
299?????????????????d?=?II?(d,?a,?b,?c,?x[11],?S42,?0xbd3af235L);?/*?62?*/
300?????????????????c?=?II?(c,?d,?a,?b,?x[2],?S43,?0x2ad7d2bbL);?/*?63?*/
301?????????????????b?=?II?(b,?c,?d,?a,?x[9],?S44,?0xeb86d391L);?/*?64?*/
302?
303?????????????????state[0]?+=?a;
304?????????????????state[1]?+=?b;
305?????????????????state[2]?+=?c;
306?????????????????state[3]?+=?d;
307?
308?????????}
309?????????
310?????????/*Encode把long數組按順序拆成byte數組，因為java的long類型是64bit的，
311???????????只拆低32bit，以適應原始C實現的用途
312?????????*/
313?????????private?void?Encode?(byte[]?output,?long[]?input,?int?len)?{
314?????????????????int?i,?j;
315?
316?????????????????for?(i?=?0,?j?=?0;?j?<?len;?i++,?j?+=?4)?{
317?????????????????????????output[j]?=?(byte)(input[i]?&?0xffL);
318?????????????????????????output[j?+?1]?=?(byte)((input[i]?>>>?8)?&?0xffL);
319?????????????????????????output[j?+?2]?=?(byte)((input[i]?>>>?16)?&?0xffL);
320?????????????????????????output[j?+?3]?=?(byte)((input[i]?>>>?24)?&?0xffL);
321?????????????????}
322?????????}
323?
324?????????/*Decode把byte數組按順序合成成long數組，因為java的long類型是64bit的，
325???????????只合成低32bit，高32bit清零，以適應原始C實現的用途
326?????????*/
327?????????private?void?Decode?(long[]?output,?byte[]?input,?int?len)?{
328?????????????????int?i,?j;
329?
330?
331?????????????????for?(i?=?0,?j?=?0;?j?<?len;?i++,?j?+=?4)
332?????????????????????????output[i]?=?b2iu(input[j])?|
333?????????????????????????????????(b2iu(input[j?+?1])?<<?8)?|
334?????????????????????????????????(b2iu(input[j?+?2])?<<?16)?|
335?????????????????????????????????(b2iu(input[j?+?3])?<<?24);
336?
337?????????????????return;
338?????????}
339????????
340?????????/*
341???????????b2iu是我寫的一個把byte按照不考慮正負號的原則的＂升位＂程序，因為java沒有unsigned運算
342?????????*/
343?????????public?static?long?b2iu(byte?b)?{
344?????????????????return?b?<?0???b?&?0x7F?+?128?:?b;
345?????????}
346?????????
347?????/*byteHEX()，用來把一個byte類型的數轉換成十六進制的ASCII表示，
348????? 因為java中的byte的toString無法實現這一點，我們又沒有C語言中的
349???????sprintf(outbuf,"%02X",ib)
350?????*/
351?????????public?static?String?byteHEX(byte?ib)?{
352?????????????????char[]?Digit?=?{?'0','1','2','3','4','5','6','7','8','9',
353?????????????????'A','B','C','D','E','F'?};
354?????????????????char?[]?ob?=?new?char[2];
355?????????????????ob[0]?=?Digit[(ib?>>>?4)?&?0X0F];
356?????????????????ob[1]?=?Digit[ib?&?0X0F];
357?????????????????String?s?=?new?String(ob);
358?????????????????return?s;
359?????????}
360?
361?????????public?static?void?main(String?args[])?{
362?
363?
364?????????????????MD5?m?=?new?MD5();
365?????????????????if?(Array.getLength(args)?==?0)?{???//如果沒有參數，執行標準的Test?Suite
366?????????????????
367????????????????????????????System.out.println("MD5?Test?suite:");
368?????????????????????System.out.println("MD5(\"\"):"+m.getMD5ofStr(""));
369?????????????????????System.out.println("MD5(\"a\"):"+m.getMD5ofStr("a"));
370?????????????????????System.out.println("MD5(\"abc\"):"+m.getMD5ofStr("abc"));
371?????????????????????System.out.println("MD5(\"message?digest\"):"+m.getMD5ofStr("message?digest"));
372?????????????????????System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):"+
373?????????????????????????m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz"));
374?????????????????????System.out.println("MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"+
375??????????????????????????m.getMD5ofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
376?????????????????}
377?????????????????else?
378???????????????????????????System.out.println("MD5("?+?args[0]?+?")="?+?m.getMD5ofStr(args[0]));
379?????????????????
380??????????
381?????????}
382?
383?}
posted on 2006-06-29 15:23
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