VB6_MD5不可逆算法

fieldmax

1. 
   
2. Private Const BITS_TO_A_BYTE = 8
   
3. Private Const BYTES_TO_A_WORD = 4
   
4. Private Const BITS_TO_A_WORD = 32
   
5. 
   
6. Private m_lOnBits(30)
   
7. Private m_l2Power(30)
   
8. 
   
9. Private Function LShift(lValue, iShiftBits)
   
10. If iShiftBits = 0 Then
    
11. LShift = lValue
    
12. Exit Function
    
13. ElseIf iShiftBits = 31 Then
    
14. If lValue And 1 Then
    
15. LShift = &H80000000
    
16. Else
    
17. LShift = 0
    
18. End If
    
19. Exit Function
    
20. ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
    
21. Err.Raise 6
    
22. End If
    
23. 
    
24. If (lValue And m_l2Power(31 - iShiftBits)) Then
    
25. LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000
    
26. Else
    
27. LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
    
28. End If
    
29. End Function
    
30. 
    
31. Private Function RShift(lValue, iShiftBits)
    
32. If iShiftBits = 0 Then
    
33. RShift = lValue
    
34. Exit Function
    
35. ElseIf iShiftBits = 31 Then
    
36. If lValue And &H80000000 Then
    
37. RShift = 1
    
38. Else
    
39. RShift = 0
    
40. End If
    
41. Exit Function
    
42. ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
    
43. Err.Raise 6
    
44. End If
    
45. 
    
46. RShift = (lValue And &H7FFFFFFE) \ m_l2Power(iShiftBits)
    
47. 
    
48. If (lValue And &H80000000) Then
    
49. RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - 1)))
    
50. End If
    
51. End Function
    
52. 
    
53. Private Function RotateLeft(lValue, iShiftBits)
    
54. RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
    
55. End Function
    
56. 
    
57. Private Function AddUnsigned(lX, lY)
    
58. Dim lX4
    
59. Dim lY4
    
60. Dim lX8
    
61. Dim lY8
    
62. Dim lResult
    
63. 
    
64. lX8 = lX And &H80000000
    
65. lY8 = lY And &H80000000
    
66. lX4 = lX And &H40000000
    
67. lY4 = lY And &H40000000
    
68. 
    
69. lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)
    
70. 
    
71. If lX4 And lY4 Then
    
72. lResult = lResult Xor &H80000000 Xor lX8 Xor lY8
    
73. ElseIf lX4 Or lY4 Then
    
74. If lResult And &H40000000 Then
    
75. lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8
    
76. Else
    
77. lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
    
78. End If
    
79. Else
    
80. lResult = lResult Xor lX8 Xor lY8
    
81. End If
    
82. 
    
83. AddUnsigned = lResult
    
84. End Function
    
85. 
    
86. Private Function md5_F(x, y, z)
    
87. md5_F = (x And y) Or ((Not x) And z)
    
88. End Function
    
89. 
    
90. Private Function md5_G(x, y, z)
    
91. md5_G = (x And z) Or (y And (Not z))
    
92. End Function
    
93. 
    
94. Private Function md5_H(x, y, z)
    
95. md5_H = (x Xor y Xor z)
    
96. End Function
    
97. 
    
98. Private Function md5_I(x, y, z)
    
99. md5_I = (y Xor (x Or (Not z)))
    
100. End Function
     
101. 
     
102. Private Sub md5_FF(a, b, c, d, x, s, ac)
     
103. a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac))
     
104. a = RotateLeft(a, s)
     
105. a = AddUnsigned(a, b)
     
106. End Sub
     
107. 
     
108. Private Sub md5_GG(a, b, c, d, x, s, ac)
     
109. a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac))
     
110. a = RotateLeft(a, s)
     
111. a = AddUnsigned(a, b)
     
112. End Sub
     
113. 
     
114. Private Sub md5_HH(a, b, c, d, x, s, ac)
     
115. a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac))
     
116. a = RotateLeft(a, s)
     
117. a = AddUnsigned(a, b)
     
118. End Sub
     
119. 
     
120. Private Sub md5_II(a, b, c, d, x, s, ac)
     
121. a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac))
     
122. a = RotateLeft(a, s)
     
123. a = AddUnsigned(a, b)
     
124. End Sub
     
125. 
     
126. Private Function ConvertToWordArray(sMessage)
     
127. Dim lMessageLength
     
128. Dim lNumberOfWords
     
129. Dim lWordArray()
     
130. Dim lBytePosition
     
131. Dim lByteCount
     
132. Dim lWordCount
     
133. 
     
134. Const MODULUS_BITS = 512
     
135. Const CONGRUENT_BITS = 448
     
136. 
     
137. lMessageLength = Len(sMessage)
     
138. 
     
139. lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)
     
140. ReDim lWordArray(lNumberOfWords - 1)
     
141. 
     
142. lBytePosition = 0
     
143. lByteCount = 0
     
144. Do Until lByteCount >= lMessageLength
     
145. lWordCount = lByteCount \ BYTES_TO_A_WORD
     
146. lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
     
147. lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)
     
148. lByteCount = lByteCount + 1
     
149. Loop
     
150. 
     
151. lWordCount = lByteCount \ BYTES_TO_A_WORD
     
152. lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
     
153. 
     
154. lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)
     
155. 
     
156. lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
     
157. lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)
     
158. 
     
159. ConvertToWordArray = lWordArray
     
160. End Function
     
161. 
     
162. Private Function WordToHex(lValue)
     
163. Dim lByte
     
164. Dim lCount
     
165. 
     
166. For lCount = 0 To 3
     
167. lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
     
168. WordToHex = WordToHex & Right("0" & Hex(lByte), 2)
     
169. Next
     
170. End Function
     
171. 
     
172. Public Function MD5(sMessage)
     
173. m_lOnBits(0) = CLng(1)
     
174. m_lOnBits(1) = CLng(3)
     
175. m_lOnBits(2) = CLng(7)
     
176. m_lOnBits(3) = CLng(15)
     
177. m_lOnBits(4) = CLng(31)
     
178. m_lOnBits(5) = CLng(63)
     
179. m_lOnBits(6) = CLng(127)
     
180. m_lOnBits(7) = CLng(255)
     
181. m_lOnBits(8) = CLng(511)
     
182. m_lOnBits(9) = CLng(1023)
     
183. m_lOnBits(10) = CLng(2047)
     
184. m_lOnBits(11) = CLng(4095)
     
185. m_lOnBits(12) = CLng(8191)
     
186. m_lOnBits(13) = CLng(16383)
     
187. m_lOnBits(14) = CLng(32767)
     
188. m_lOnBits(15) = CLng(65535)
     
189. m_lOnBits(16) = CLng(131071)
     
190. m_lOnBits(17) = CLng(262143)
     
191. m_lOnBits(18) = CLng(524287)
     
192. m_lOnBits(19) = CLng(1048575)
     
193. m_lOnBits(20) = CLng(2097151)
     
194. m_lOnBits(21) = CLng(4194303)
     
195. m_lOnBits(22) = CLng(8388607)
     
196. m_lOnBits(23) = CLng(16777215)
     
197. m_lOnBits(24) = CLng(33554431)
     
198. m_lOnBits(25) = CLng(67108863)
     
199. m_lOnBits(26) = CLng(134217727)
     
200. m_lOnBits(27) = CLng(268435455)
     
201. m_lOnBits(28) = CLng(536870911)
     
202. m_lOnBits(29) = CLng(1073741823)
     
203. m_lOnBits(30) = CLng(2147483647)
     
204. 
     
205. m_l2Power(0) = CLng(1)
     
206. m_l2Power(1) = CLng(2)
     
207. m_l2Power(2) = CLng(4)
     
208. m_l2Power(3) = CLng(8)
     
209. m_l2Power(4) = CLng(16)
     
210. m_l2Power(5) = CLng(32)
     
211. m_l2Power(6) = CLng(64)
     
212. m_l2Power(7) = CLng(128)
     
213. m_l2Power(8) = CLng(256)
     
214. m_l2Power(9) = CLng(512)
     
215. m_l2Power(10) = CLng(1024)
     
216. m_l2Power(11) = CLng(2048)
     
217. m_l2Power(12) = CLng(4096)
     
218. m_l2Power(13) = CLng(8192)
     
219. m_l2Power(14) = CLng(16384)
     
220. m_l2Power(15) = CLng(32768)
     
221. m_l2Power(16) = CLng(65536)
     
222. m_l2Power(17) = CLng(131072)
     
223. m_l2Power(18) = CLng(262144)
     
224. m_l2Power(19) = CLng(524288)
     
225. m_l2Power(20) = CLng(1048576)
     
226. m_l2Power(21) = CLng(2097152)
     
227. m_l2Power(22) = CLng(4194304)
     
228. m_l2Power(23) = CLng(8388608)
     
229. m_l2Power(24) = CLng(16777216)
     
230. m_l2Power(25) = CLng(33554432)
     
231. m_l2Power(26) = CLng(67108864)
     
232. m_l2Power(27) = CLng(134217728)
     
233. m_l2Power(28) = CLng(268435456)
     
234. m_l2Power(29) = CLng(536870912)
     
235. m_l2Power(30) = CLng(1073741824)
     
236. 
     
237. 
     
238. 
     
239. Dim x
     
240. Dim k
     
241. Dim AA
     
242. Dim BB
     
243. Dim CC
     
244. Dim DD
     
245. Dim a
     
246. Dim b
     
247. Dim c
     
248. Dim d
     
249. 
     
250. Const S11 = 7
     
251. Const S12 = 12
     
252. Const S13 = 17
     
253. Const S14 = 22
     
254. Const S21 = 5
     
255. Const S22 = 9
     
256. Const S23 = 14
     
257. Const S24 = 20
     
258. Const S31 = 4
     
259. Const S32 = 11
     
260. Const S33 = 16
     
261. Const S34 = 23
     
262. Const S41 = 6
     
263. Const S42 = 10
     
264. Const S43 = 15
     
265. Const S44 = 21
     
266. 
     
267. x = ConvertToWordArray(sMessage)
     
268. 
     
269. a = &H67452301
     
270. b = &HEFCDAB89
     
271. c = &H98BADCFE
     
272. d = &H10325476
     
273. 
     
274. For k = 0 To UBound(x) Step 16
     
275. AA = a
     
276. BB = b
     
277. CC = c
     
278. DD = d
     
279. 
     
280. md5_FF a, b, c, d, x(k + 0), S11, &HD76AA478
     
281. md5_FF d, a, b, c, x(k + 1), S12, &HE8C7B756
     
282. md5_FF c, d, a, b, x(k + 2), S13, &H242070DB
     
283. md5_FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE
     
284. md5_FF a, b, c, d, x(k + 4), S11, &HF57C0FAF
     
285. md5_FF d, a, b, c, x(k + 5), S12, &H4787C62A
     
286. md5_FF c, d, a, b, x(k + 6), S13, &HA8304613
     
287. md5_FF b, c, d, a, x(k + 7), S14, &HFD469501
     
288. md5_FF a, b, c, d, x(k + 8), S11, &H698098D8
     
289. md5_FF d, a, b, c, x(k + 9), S12, &H8B44F7AF
     
290. md5_FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1
     
291. md5_FF b, c, d, a, x(k + 11), S14, &H895CD7BE
     
292. md5_FF a, b, c, d, x(k + 12), S11, &H6B901122
     
293. md5_FF d, a, b, c, x(k + 13), S12, &HFD987193
     
294. md5_FF c, d, a, b, x(k + 14), S13, &HA679438E
     
295. md5_FF b, c, d, a, x(k + 15), S14, &H49B40821
     
296. 
     
297. md5_GG a, b, c, d, x(k + 1), S21, &HF61E2562
     
298. md5_GG d, a, b, c, x(k + 6), S22, &HC040B340
     
299. md5_GG c, d, a, b, x(k + 11), S23, &H265E5A51
     
300. md5_GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA
     
301. md5_GG a, b, c, d, x(k + 5), S21, &HD62F105D
     
302. md5_GG d, a, b, c, x(k + 10), S22, &H2441453
     
303. md5_GG c, d, a, b, x(k + 15), S23, &HD8A1E681
     
304. md5_GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8
     
305. md5_GG a, b, c, d, x(k + 9), S21, &H21E1CDE6
     
306. md5_GG d, a, b, c, x(k + 14), S22, &HC33707D6
     
307. md5_GG c, d, a, b, x(k + 3), S23, &HF4D50D87
     
308. md5_GG b, c, d, a, x(k + 8), S24, &H455A14ED
     
309. md5_GG a, b, c, d, x(k + 13), S21, &HA9E3E905
     
310. md5_GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8
     
311. md5_GG c, d, a, b, x(k + 7), S23, &H676F02D9
     
312. md5_GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A
     
313. 
     
314. md5_HH a, b, c, d, x(k + 5), S31, &HFFFA3942
     
315. md5_HH d, a, b, c, x(k + 8), S32, &H8771F681
     
316. md5_HH c, d, a, b, x(k + 11), S33, &H6D9D6122
     
317. md5_HH b, c, d, a, x(k + 14), S34, &HFDE5380C
     
318. md5_HH a, b, c, d, x(k + 1), S31, &HA4BEEA44
     
319. md5_HH d, a, b, c, x(k + 4), S32, &H4BDECFA9
     
320. md5_HH c, d, a, b, x(k + 7), S33, &HF6BB4B60
     
321. md5_HH b, c, d, a, x(k + 10), S34, &HBEBFBC70
     
322. md5_HH a, b, c, d, x(k + 13), S31, &H289B7EC6
     
323. md5_HH d, a, b, c, x(k + 0), S32, &HEAA127FA
     
324. md5_HH c, d, a, b, x(k + 3), S33, &HD4EF3085
     
325. md5_HH b, c, d, a, x(k + 6), S34, &H4881D05
     
326. md5_HH a, b, c, d, x(k + 9), S31, &HD9D4D039
     
327. md5_HH d, a, b, c, x(k + 12), S32, &HE6DB99E5
     
328. md5_HH c, d, a, b, x(k + 15), S33, &H1FA27CF8
     
329. md5_HH b, c, d, a, x(k + 2), S34, &HC4AC5665
     
330. 
     
331. md5_II a, b, c, d, x(k + 0), S41, &HF4292244
     
332. md5_II d, a, b, c, x(k + 7), S42, &H432AFF97
     
333. md5_II c, d, a, b, x(k + 14), S43, &HAB9423A7
     
334. md5_II b, c, d, a, x(k + 5), S44, &HFC93A039
     
335. md5_II a, b, c, d, x(k + 12), S41, &H655B59C3
     
336. md5_II d, a, b, c, x(k + 3), S42, &H8F0CCC92
     
337. md5_II c, d, a, b, x(k + 10), S43, &HFFEFF47D
     
338. md5_II b, c, d, a, x(k + 1), S44, &H85845DD1
     
339. md5_II a, b, c, d, x(k + 8), S41, &H6FA87E4F
     
340. md5_II d, a, b, c, x(k + 15), S42, &HFE2CE6E0
     
341. md5_II c, d, a, b, x(k + 6), S43, &HA3014314
     
342. md5_II b, c, d, a, x(k + 13), S44, &H4E0811A1
     
343. md5_II a, b, c, d, x(k + 4), S41, &HF7537E82
     
344. md5_II d, a, b, c, x(k + 11), S42, &HBD3AF235
     
345. md5_II c, d, a, b, x(k + 2), S43, &H2AD7D2BB
     
346. md5_II b, c, d, a, x(k + 9), S44, &HEB86D391
     
347. 
     
348. a = AddUnsigned(a, AA)
     
349. b = AddUnsigned(b, BB)
     
350. c = AddUnsigned(c, CC)
     
351. d = AddUnsigned(d, DD)
     
352. Next
     
353. 
     
354. MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
     
355. ' MD5=LCase(WordToHex(b) & WordToHex(c)) 'I crop this to fit 16byte database password :D
     
356. End Function
     
357. 
     
358. Private Sub Command1_Click()
     
359. Text2.Text = MD5(Text1.Text)
     
360. End Sub
     

复制代码

zc333

看看。。。。。。。。。。。。学习