asp编程中非常实用的例子(9)

Do Until lByteCount >= lMessageLength
lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount 1, 1)), lBytePosition)
lByteCount = lByteCount 1
Loop

lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE

lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)

lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)

ConvertToWordArray = lWordArray
End Function

Private Function WordToHex(lvalue)
Dim lByte
Dim lCount

For lCount = 0 To 3
lByte = RShift(lvalue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
WordToHex = WordToHex & Right("0" & Hex(lByte), 2)
Next
End Function

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MD5不可逆加密算法的ASP实现实例
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Public Function MD5(sMessage)
m_lOnBits(0) = CLng(1)
m_lOnBits(1) = CLng(3)
m_lOnBits(2) = CLng(7)
m_lOnBits(3) = CLng(15)
m_lOnBits(4) = CLng(31)
m_lOnBits(5) = CLng(63)
m_lOnBits(6) = CLng(127)
m_lOnBits(7) = CLng(255)
m_lOnBits(8) = CLng(511)
m_lOnBits(9) = CLng(1023)
m_lOnBits(10) = CLng(2047)
m_lOnBits(11) = CLng(4095)
m_lOnBits(12) = CLng(8191)
m_lOnBits(13) = CLng(16383)
m_lOnBits(14) = CLng(32767)
m_lOnBits(15) = CLng(65535)
m_lOnBits(16) = CLng(131071)
m_lOnBits(17) = CLng(262143)
m_lOnBits(18) = CLng(524287)
m_lOnBits(19) = CLng(1048575)
m_lOnBits(20) = CLng(2097151)
m_lOnBits(21) = CLng(4194303)
m_lOnBits(22) = CLng(8388607)
m_lOnBits(23) = CLng(16777215)
m_lOnBits(24) = CLng(33554431)
m_lOnBits(25) = CLng(67108863)
m_lOnBits(26) = CLng(134217727)
m_lOnBits(27) = CLng(268435455)
m_lOnBits(28) = CLng(536870911)
m_lOnBits(29) = CLng(1073741823)
m_lOnBits(30) = CLng(2147483647)

m_l2Power(0) = CLng(1)
m_l2Power(1) = CLng(2)
m_l2Power(2) = CLng(4)
m_l2Power(3) = CLng(8)
m_l2Power(4) = CLng(16)
m_l2Power(5) = CLng(32)
m_l2Power(6) = CLng(64)
m_l2Power(7) = CLng(128)
m_l2Power(8) = CLng(256)
m_l2Power(9) = CLng(512)
m_l2Power(10) = CLng(1024)
m_l2Power(11) = CLng(2048)
m_l2Power(12) = CLng(4096)
m_l2Power(13) = CLng(8192)
m_l2Power(14) = CLng(16384)
m_l2Power(15) = CLng(32768)
m_l2Power(16) = CLng(65536)
m_l2Power(17) = CLng(131072)
m_l2Power(18) = CLng(262144)
m_l2Power(19) = CLng(524288)
m_l2Power(20) = CLng(1048576)
m_l2Power(21) = CLng(2097152)
m_l2Power(22) = CLng(4194304)
m_l2Power(23) = CLng(8388608)
m_l2Power(24) = CLng(16777216)
m_l2Power(25) = CLng(33554432)
m_l2Power(26) = CLng(67108864)
m_l2Power(27) = CLng(134217728)
m_l2Power(28) = CLng(268435456)
m_l2Power(29) = CLng(536870912)
m_l2Power(30) = CLng(1073741824)

Dim x
Dim k
Dim AA
Dim BB
Dim CC
Dim DD
Dim a
Dim b
Dim c
Dim d

Const S11 = 7
Const S12 = 12
Const S13 = 17
Const S14 = 22
Const S21 = 5
Const S22 = 9
Const S23 = 14
Const S24 = 20
Const S31 = 4
Const S32 = 11
Const S33 = 16
Const S34 = 23
Const S41 = 6
Const S42 = 10
Const S43 = 15
Const S44 = 21

x = ConvertToWordArray(sMessage)

a = &H67452301
b = &HEFCDAB89
c = &H98BADCFE
d = &H10325476

For k = 0 To UBound(x) Step 16
AA = a
BB = b
CC = c
DD = d

md5_FF a, b, c, d, x(k 0), S11, &HD76AA478
md5_FF d, a, b, c, x(k 1), S12, &HE8C7B756
md5_FF c, d, a, b, x(k 2), S13, &H242070DB
md5_FF b, c, d, a, x(k 3), S14, &HC1BDCEEE
md5_FF a, b, c, d, x(k 4), S11, &HF57C0FAF
md5_FF d, a, b, c, x(k 5), S12, &H4787C62A
md5_FF c, d, a, b, x(k 6), S13, &HA8304613
md5_FF b, c, d, a, x(k 7), S14, &HFD469501
md5_FF a, b, c, d, x(k 8), S11, &H698098D8
md5_FF d, a, b, c, x(k 9), S12, &H8B44F7AF
md5_FF c, d, a, b, x(k 10), S13, &HFFFF5BB1
md5_FF b, c, d, a, x(k 11), S14, &H895CD7BE
md5_FF a, b, c, d, x(k 12), S11, &H6B901122
md5_FF d, a, b, c, x(k 13), S12, &HFD987193
md5_FF c, d, a, b, x(k 14), S13, &HA679438E
md5_FF b, c, d, a, x(k 15), S14, &H49B40821

md5_GG a, b, c, d, x(k 1), S21, &HF61E2562
md5_GG d, a, b, c, x(k 6), S22, &HC040B340
md5_GG c, d, a, b, x(k 11), S23, &H265E5A51
md5_GG b, c, d, a, x(k 0), S24, &HE9B6C7AA
md5_GG a, b, c, d, x(k 5), S21, &HD62F105D
md5_GG d, a, b, c, x(k 10), S22, &H2441453
md5_GG c, d, a, b, x(k 15), S23, &HD8A1E681
md5_GG b, c, d, a, x(k 4), S24, &HE7D3FBC8
md5_GG a, b, c, d, x(k 9), S21, &H21E1CDE6
md5_GG d, a, b, c, x(k 14), S22, &HC33707D6
md5_GG c, d, a, b, x(k 3), S23, &HF4D50D87
md5_GG b, c, d, a, x(k 8), S24, &H455A14ED

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