关键字 VB 加密/解密 汉字加密 全部代码入下:Function UserCode(password As String) As String '用户口令加密 Dim il_bit, il_x, il_y, il_z, il_len, i As Long Dim is_out As String il_len = LenB(password) il_x = 0 il_y = 0 is_out = "" For i = 1 To il_len il_bit = AscB(MidB(password, i, 1)) 'b系列支持中文
password = is_out il_len = LenB(password) il_x = 0 il_y = 0 is_out = "" For i = 1 To il_len il_bit = AscB(MidB(password, i, 1)) '取前4位值 il_y = il_bit / 16 + 64 is_out = is_out & ChrB(Fix(il_y)) '取后4位值 il_y = (il_bit Mod 16) + 64 is_out = is_out & ChrB(Fix(il_y)) Next UserCode = is_out End Function Function UserDeCode(password As String) As String '口令解密 Dim is_out As String Dim il_x, il_y, il_len, i, il_bit As Long il_len = LenB(password) il_x = 0 il_y = 0 is_out = "" For i = 1 To il_len Step 2 il_bit = AscB(MidB(password, i, 1)) '取前4位值 il_y = (il_bit - 64) * 16 '取后4位值 'dd = AscW(Mid(password, i + 1, 1)) - 64 il_y = il_y + AscB(MidB(password, i + 1, 1)) - 64 is_out = is_out & ChrB(il_y) Next il_x = 0 il_y = 0 password = is_out is_out = "" il_len = LenB(password) il_x = AscB(MidB(password, il_len, 1)) For i = (il_len - 1) To 1 Step -1 il_y = il_x * 256 + AscB(MidB(password, i, 1)) il_x = il_y Mod 13 is_out = ChrB(Fix(il_y / 13)) & is_out Next UserDeCode = is_out End Function
[名称] MD5加密算法源代码[语言种类] Visual Basic[类别一] 算法[类别二] 加解密[类别三] 空[数据来源] 未知[保存时间] 2002-11-18[关键字一] MD5[关键字二] 加密/解密[关键字三] 算法[内容简介] 空[源代码内容]Option ExplicitPrivate Const OFFSET_4 = 4294967296# Private Const MAXINT_4 = 2147483647Private ByteCounter As Long Private State(1 To 4) As Long Private ByteBuffer(63) As Byte Private Const S11 = 7 Private Const S12 = 12 Private Const S13 = 17 Private Const S14 = 22 Private Const S21 = 5 Private Const S22 = 9 Private Const S23 = 14 Private Const S24 = 20 Private Const S31 = 4 Private Const S32 = 11 Private Const S33 = 16 Private Const S34 = 23 Private Const S41 = 6 Private Const S42 = 10 Private Const S43 = 15 Private Const S44 = 21' ' Function to digest a text string and output the result as a string ' of hexadecimal characters. ' Public Function Encrypt(ByVal In_Data As String) As String On Error GoTo EncryptErrEncrypt = "" MD5Init MD5Update Len(In_Data), StringToArray(In_Data) MD5Final Encrypt = GetValues Exit SubEncryptErr: Encrypt = "" Err.Raise vbObjectError + Err.Number, Err.Source, Err.Description 'Encrypt004Str = FalseEnd Function' ' A utility function which converts a string into an array of ' bytes. ' Private Function StringToArray(InString As String) As Byte() Dim i As Integer Dim bytBuffer() As Byte ReDim bytBuffer(Len(InString)) For i = 0 To Len(InString) - 1 bytBuffer(i) = Asc(Mid(InString, i + 1, 1)) Next i StringToArray = bytBuffer End Function' ' Concatenate the four state vaules into one string ' Private Function GetValues() As String GetValues = LongToString(State(1)) & LongToString(State(2)) & LongToString(State(3)) & LongToString(State(4)) End Function' ' Convert a Long to a Hex string ' Private Function LongToString(Num As Long) As String Dim a As Byte Dim b As Byte Dim C As Byte Dim D As Bytea = Num And &HFF& If a < 16 Then LongToString = "0" & Hex(a) Else LongToString = Hex(a) End If
b = (Num And &HFF00&) \ 256 If b < 16 Then LongToString = LongToString & "0" & Hex(b) Else LongToString = LongToString & Hex(b) End IfC = (Num And &HFF0000) \ 65536 If C < 16 Then LongToString = LongToString & "0" & Hex(C) Else LongToString = LongToString & Hex(C) End If
If Num < 0 Then D = ((Num And &H7F000000) \ 16777216) Or &H80& Else D = (Num And &HFF000000) \ 16777216 End IfIf D < 16 Then LongToString = LongToString & "0" & Hex(D) Else LongToString = LongToString & Hex(D) End IfEnd Function' ' Initialize the class ' This must be called before a digest calculation is started ' Private Sub MD5Init() ByteCounter = 0 State(1) = UnsignedToLong(1732584193#) State(2) = UnsignedToLong(4023233417#) State(3) = UnsignedToLong(2562383102#) State(4) = UnsignedToLong(271733878#) End Sub ' ' MD5 Final ' Private Sub MD5Final() Dim dblBits As DoubleDim padding(72) As Byte Dim lngBytesBuffered As Longpadding(0) = &H80dblBits = ByteCounter * 8' Pad out lngBytesBuffered = ByteCounter Mod 64 If lngBytesBuffered <= 56 Then MD5Update 56 - lngBytesBuffered, padding Else MD5Update 120 - ByteCounter, padding End If padding(0) = UnsignedToLong(dblBits) And &HFF& padding(1) = UnsignedToLong(dblBits) \ 256 And &HFF& padding(2) = UnsignedToLong(dblBits) \ 65536 And &HFF& padding(3) = UnsignedToLong(dblBits) \ 16777216 And &HFF& padding(4) = 0 padding(5) = 0 padding(6) = 0 padding(7) = 0MD5Update 8, padding End Sub
' ' Break up input stream into 64 byte chunks ' Private Sub MD5Update(InputLen As Long, InputBuffer() As Byte) Dim II As Integer Dim i As Integer Dim J As Integer Dim K As Integer Dim lngBufferedBytes As Long Dim lngBufferRemaining As Long Dim lngRem As LonglngBufferedBytes = ByteCounter Mod 64 lngBufferRemaining = 64 - lngBufferedBytes ByteCounter = ByteCounter + InputLen ' Use up old buffer results first If InputLen >= lngBufferRemaining Then For II = 0 To lngBufferRemaining - 1 ByteBuffer(lngBufferedBytes + II) = InputBuffer(II) Next II MD5Transform ByteBufferlngRem = (InputLen) Mod 64 ' The transfer is a multiple of 64 lets do some transformations For i = lngBufferRemaining To InputLen - II - lngRem Step 64 For J = 0 To 63 ByteBuffer(J) = InputBuffer(i + J) Next J MD5Transform ByteBuffer Next i lngBufferedBytes = 0 Else i = 0 End If' Buffer any remaining input For K = 0 To InputLen - i - 1 ByteBuffer(lngBufferedBytes + K) = InputBuffer(i + K) Next KEnd Sub' ' MD5 Transform ' Private Sub MD5Transform(Buffer() As Byte) Dim X(16) As Long Dim a As Long Dim b As Long Dim C As Long Dim D As Longa = State(1) b = State(2) C = State(3) D = State(4)Decode 64, X, Buffer' Round 1 FF a, b, C, D, X(0), S11, -680876936 FF D, a, b, C, X(1), S12, -389564586 FF C, D, a, b, X(2), S13, 606105819 FF b, C, D, a, X(3), S14, -1044525330 FF a, b, C, D, X(4), S11, -176418897 FF D, a, b, C, X(5), S12, 1200080426 FF C, D, a, b, X(6), S13, -1473231341 FF b, C, D, a, X(7), S14, -45705983 FF a, b, C, D, X(8), S11, 1770035416 FF D, a, b, C, X(9), S12, -1958414417 FF C, D, a, b, X(10), S13, -42063 FF b, C, D, a, X(11), S14, -1990404162 FF a, b, C, D, X(12), S11, 1804603682 FF D, a, b, C, X(13), S12, -40341101 FF C, D, a, b, X(14), S13, -1502002290 FF b, C, D, a, X(15), S14, 1236535329' Round 2 GG a, b, C, D, X(1), S21, -165796510 GG D, a, b, C, X(6), S22, -1069501632 GG C, D, a, b, X(11), S23, 643717713 GG b, C, D, a, X(0), S24, -373897302 GG a, b, C, D, X(5), S21, -701558691 GG D, a, b, C, X(10), S22, 38016083 GG C, D, a, b, X(15), S23, -660478335 GG b, C, D, a, X(4), S24, -405537848 GG a, b, C, D, X(9), S21, 568446438 GG D, a, b, C, X(14), S22, -1019803690 GG C, D, a, b, X(3), S23, -187363961 GG b, C, D, a, X(8), S24, 1163531501 GG a, b, C, D, X(13), S21, -1444681467 GG D, a, b, C, X(2), S22, -51403784 GG C, D, a, b, X(7), S23, 1735328473 GG b, C, D, a, X(12), S24, -1926607734' Round 3 HH a, b, C, D, X(5), S31, -378558 HH D, a, b, C, X(8), S32, -2022574463 HH C, D, a, b, X(11), S33, 1839030562 HH b, C, D, a, X(14), S34, -35309556 HH a, b, C, D, X(1), S31, -1530992060 HH D, a, b, C, X(4), S32, 1272893353 HH C, D, a, b, X(7), S33, -155497632 HH b, C, D, a, X(10), S34, -1094730640 HH a, b, C, D, X(13), S31, 681279174 HH D, a, b, C, X(0), S32, -358537222 HH C, D, a, b, X(3), S33, -722521979 HH b, C, D, a, X(6), S34, 76029189 HH a, b, C, D, X(9), S31, -640364487 HH D, a, b, C, X(12), S32, -421815835 HH C, D, a, b, X(15), S33, 530742520 HH b, C, D, a, X(2), S34, -995338651' Round 4 II a, b, C, D, X(0), S41, -198630844 II D, a, b, C, X(7), S42, 1126891415 II C, D, a, b, X(14), S43, -1416354905 II b, C, D, a, X(5), S44, -57434055 II a, b, C, D, X(12), S41, 1700485571 II D, a, b, C, X(3), S42, -1894986606 II C, D, a, b, X(10), S43, -1051523 II b, C, D, a, X(1), S44, -2054922799 II a, b, C, D, X(8), S41, 1873313359 II D, a, b, C, X(15), S42, -30611744 II C, D, a, b, X(6), S43, -1560198380 II b, C, D, a, X(13), S44, 1309151649 II a, b, C, D, X(4), S41, -145523070 II D, a, b, C, X(11), S42, -1120210379 II C, D, a, b, X(2), S43, 718787259 II b, C, D, a, X(9), S44, -343485551 State(1) = LongOverflowAdd(State(1), a) State(2) = LongOverflowAdd(State(2), b) State(3) = LongOverflowAdd(State(3), C) State(4) = LongOverflowAdd(State(4), D) '/* Zeroize sensitive information. '*/ 'MD5_memset ((POINTER)x, 0, sizeof (x)); End SubPrivate Sub Decode(Length As Integer, OutputBuffer() As Long, InputBuffer() As Byte) Dim intDblIndex As Integer Dim intByteIndex As Integer Dim dblSum As DoubleintDblIndex = 0 For intByteIndex = 0 To Length - 1 Step 4 dblSum = InputBuffer(intByteIndex) + _ InputBuffer(intByteIndex + 1) * 256# + _ InputBuffer(intByteIndex + 2) * 65536# + _ InputBuffer(intByteIndex + 3) * 16777216# OutputBuffer(intDblIndex) = UnsignedToLong(dblSum) intDblIndex = intDblIndex + 1 Next intByteIndex End Sub' ' FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. ' Rotation is separate from addition to prevent recomputation. ' Private Function FF(a As Long, _ b As Long, _ C As Long, _ D As Long, _ X As Long, _ S As Long, _ ac As Long) As Long a = LongOverflowAdd4(a, (b And C) Or (Not (b) And D), X, ac) a = LongLeftRotate(a, S) a = LongOverflowAdd(a, b) End FunctionPrivate Function GG(a As Long, _ b As Long, _ C As Long, _ D As Long, _ X As Long, _ S As Long, _ ac As Long) As Long a = LongOverflowAdd4(a, (b And D) Or (C And Not (D)), X, ac) a = LongLeftRotate(a, S) a = LongOverflowAdd(a, b) End FunctionPrivate Function HH(a As Long, _ b As Long, _ C As Long, _ D As Long, _ X As Long, _ S As Long, _ ac As Long) As Long a = LongOverflowAdd4(a, b Xor C Xor D, X, ac) a = LongLeftRotate(a, S) a = LongOverflowAdd(a, b) End FunctionPrivate Function II(a As Long, _ b As Long, _ C As Long, _ D As Long, _ X As Long, _ S As Long, _ ac As Long) As Long a = LongOverflowAdd4(a, C Xor (b Or Not (D)), X, ac) a = LongLeftRotate(a, S) a = LongOverflowAdd(a, b) End Function' ' Rotate a long to the right ' Private Function LongLeftRotate(value As Long, bits As Long) As Long Dim lngSign As Long Dim lngI As Long bits = bits Mod 32 If bits = 0 Then LongLeftRotate = value: Exit Function For lngI = 1 To bits lngSign = value And &HC0000000 value = (value And &H3FFFFFFF) * 2 value = value Or ((lngSign < 0) And 1) Or (CBool(lngSign And _ &H40000000) And &H80000000) Next LongLeftRotate = value End Function' ' Function to add two unsigned numbers together as in C. ' Overflows are ignored! ' Private Function LongOverflowAdd(Val1 As Long, Val2 As Long) As Long Dim lngHighWord As Long Dim lngLowWord As Long Dim lngOverflow As LonglngLowWord = (Val1 And &HFFFF&) + (Val2 And &HFFFF&) lngOverflow = lngLowWord \ 65536 lngHighWord = (((Val1 And &HFFFF0000) \ 65536) + ((Val2 And &HFFFF0000) \ 65536) + lngOverflow) And &HFFFF& LongOverflowAdd = UnsignedToLong((lngHighWord * 65536#) + (lngLowWord And &HFFFF&)) End Function' ' Function to add two unsigned numbers together as in C. ' Overflows are ignored! ' Private Function LongOverflowAdd4(Val1 As Long, Val2 As Long, val3 As Long, val4 As Long) As Long Dim lngHighWord As Long Dim lngLowWord As Long Dim lngOverflow As LonglngLowWord = (Val1 And &HFFFF&) + (Val2 And &HFFFF&) + (val3 And &HFFFF&) + (val4 And &HFFFF&) lngOverflow = lngLowWord \ 65536 lngHighWord = (((Val1 And &HFFFF0000) \ 65536) + _ ((Val2 And &HFFFF0000) \ 65536) + _ ((val3 And &HFFFF0000) \ 65536) + _ ((val4 And &HFFFF0000) \ 65536) + _ lngOverflow) And &HFFFF& LongOverflowAdd4 = UnsignedToLong((lngHighWord * 65536#) + (lngLowWord And &HFFFF&)) End Function' ' Convert an unsigned double into a long ' Private Function UnsignedToLong(value As Double) As Long If value < 0 Or value >= OFFSET_4 Then Error 6 ' Overflow If value <= MAXINT_4 Then UnsignedToLong = value Else UnsignedToLong = value - OFFSET_4 End If End Function' ' Convert a long to an unsigned Double ' Private Function LongToUnsigned(value As Long) As Double If value < 0 Then LongToUnsigned = value + OFFSET_4 Else LongToUnsigned = value End If End Function
关键字 VB 加密/解密 汉字加密 全部代码入下:Function UserCode(password As String) As String
'用户口令加密
Dim il_bit, il_x, il_y, il_z, il_len, i As Long
Dim is_out As String
il_len = LenB(password)
il_x = 0
il_y = 0
is_out = ""
For i = 1 To il_len
il_bit = AscB(MidB(password, i, 1)) 'b系列支持中文
il_y = (il_bit * 13 Mod 256) + il_x
is_out = is_out & ChrB(Fix(il_y)) '取整 int和fix区别: fix修正负数
il_x = il_bit * 13 / 256
Next
is_out = is_out & ChrB(Fix(il_x))
password = is_out
il_len = LenB(password)
il_x = 0
il_y = 0
is_out = ""
For i = 1 To il_len
il_bit = AscB(MidB(password, i, 1))
'取前4位值
il_y = il_bit / 16 + 64
is_out = is_out & ChrB(Fix(il_y))
'取后4位值
il_y = (il_bit Mod 16) + 64
is_out = is_out & ChrB(Fix(il_y))
Next
UserCode = is_out
End Function
Function UserDeCode(password As String) As String
'口令解密
Dim is_out As String
Dim il_x, il_y, il_len, i, il_bit As Long il_len = LenB(password)
il_x = 0
il_y = 0
is_out = ""
For i = 1 To il_len Step 2
il_bit = AscB(MidB(password, i, 1))
'取前4位值
il_y = (il_bit - 64) * 16
'取后4位值
'dd = AscW(Mid(password, i + 1, 1)) - 64
il_y = il_y + AscB(MidB(password, i + 1, 1)) - 64
is_out = is_out & ChrB(il_y)
Next il_x = 0
il_y = 0
password = is_out
is_out = "" il_len = LenB(password)
il_x = AscB(MidB(password, il_len, 1))
For i = (il_len - 1) To 1 Step -1
il_y = il_x * 256 + AscB(MidB(password, i, 1))
il_x = il_y Mod 13
is_out = ChrB(Fix(il_y / 13)) & is_out
Next
UserDeCode = is_out
End Function
Private Const MAXINT_4 = 2147483647Private ByteCounter As Long
Private State(1 To 4) As Long
Private ByteBuffer(63) As Byte
Private Const S11 = 7
Private Const S12 = 12
Private Const S13 = 17
Private Const S14 = 22
Private Const S21 = 5
Private Const S22 = 9
Private Const S23 = 14
Private Const S24 = 20
Private Const S31 = 4
Private Const S32 = 11
Private Const S33 = 16
Private Const S34 = 23
Private Const S41 = 6
Private Const S42 = 10
Private Const S43 = 15
Private Const S44 = 21'
' Function to digest a text string and output the result as a string
' of hexadecimal characters.
'
Public Function Encrypt(ByVal In_Data As String) As String
On Error GoTo EncryptErrEncrypt = ""
MD5Init
MD5Update Len(In_Data), StringToArray(In_Data)
MD5Final
Encrypt = GetValues
Exit SubEncryptErr:
Encrypt = ""
Err.Raise vbObjectError + Err.Number, Err.Source, Err.Description
'Encrypt004Str = FalseEnd Function'
' A utility function which converts a string into an array of
' bytes.
'
Private Function StringToArray(InString As String) As Byte()
Dim i As Integer
Dim bytBuffer() As Byte
ReDim bytBuffer(Len(InString))
For i = 0 To Len(InString) - 1
bytBuffer(i) = Asc(Mid(InString, i + 1, 1))
Next i
StringToArray = bytBuffer
End Function'
' Concatenate the four state vaules into one string
'
Private Function GetValues() As String
GetValues = LongToString(State(1)) & LongToString(State(2)) & LongToString(State(3)) & LongToString(State(4))
End Function'
' Convert a Long to a Hex string
'
Private Function LongToString(Num As Long) As String
Dim a As Byte
Dim b As Byte
Dim C As Byte
Dim D As Bytea = Num And &HFF&
If a < 16 Then
LongToString = "0" & Hex(a)
Else
LongToString = Hex(a)
End If
b = (Num And &HFF00&) \ 256
If b < 16 Then
LongToString = LongToString & "0" & Hex(b)
Else
LongToString = LongToString & Hex(b)
End IfC = (Num And &HFF0000) \ 65536
If C < 16 Then
LongToString = LongToString & "0" & Hex(C)
Else
LongToString = LongToString & Hex(C)
End If
If Num < 0 Then
D = ((Num And &H7F000000) \ 16777216) Or &H80&
Else
D = (Num And &HFF000000) \ 16777216
End IfIf D < 16 Then
LongToString = LongToString & "0" & Hex(D)
Else
LongToString = LongToString & Hex(D)
End IfEnd Function'
' Initialize the class
' This must be called before a digest calculation is started
'
Private Sub MD5Init()
ByteCounter = 0
State(1) = UnsignedToLong(1732584193#)
State(2) = UnsignedToLong(4023233417#)
State(3) = UnsignedToLong(2562383102#)
State(4) = UnsignedToLong(271733878#)
End Sub
'
' MD5 Final
'
Private Sub MD5Final()
Dim dblBits As DoubleDim padding(72) As Byte
Dim lngBytesBuffered As Longpadding(0) = &H80dblBits = ByteCounter * 8' Pad out
lngBytesBuffered = ByteCounter Mod 64
If lngBytesBuffered <= 56 Then
MD5Update 56 - lngBytesBuffered, padding
Else
MD5Update 120 - ByteCounter, padding
End If
padding(0) = UnsignedToLong(dblBits) And &HFF&
padding(1) = UnsignedToLong(dblBits) \ 256 And &HFF&
padding(2) = UnsignedToLong(dblBits) \ 65536 And &HFF&
padding(3) = UnsignedToLong(dblBits) \ 16777216 And &HFF&
padding(4) = 0
padding(5) = 0
padding(6) = 0
padding(7) = 0MD5Update 8, padding
End Sub
'
' Break up input stream into 64 byte chunks
'
Private Sub MD5Update(InputLen As Long, InputBuffer() As Byte)
Dim II As Integer
Dim i As Integer
Dim J As Integer
Dim K As Integer
Dim lngBufferedBytes As Long
Dim lngBufferRemaining As Long
Dim lngRem As LonglngBufferedBytes = ByteCounter Mod 64
lngBufferRemaining = 64 - lngBufferedBytes
ByteCounter = ByteCounter + InputLen
' Use up old buffer results first
If InputLen >= lngBufferRemaining Then
For II = 0 To lngBufferRemaining - 1
ByteBuffer(lngBufferedBytes + II) = InputBuffer(II)
Next II
MD5Transform ByteBufferlngRem = (InputLen) Mod 64
' The transfer is a multiple of 64 lets do some transformations
For i = lngBufferRemaining To InputLen - II - lngRem Step 64
For J = 0 To 63
ByteBuffer(J) = InputBuffer(i + J)
Next J
MD5Transform ByteBuffer
Next i
lngBufferedBytes = 0
Else
i = 0
End If' Buffer any remaining input
For K = 0 To InputLen - i - 1
ByteBuffer(lngBufferedBytes + K) = InputBuffer(i + K)
Next KEnd Sub'
' MD5 Transform
'
Private Sub MD5Transform(Buffer() As Byte)
Dim X(16) As Long
Dim a As Long
Dim b As Long
Dim C As Long
Dim D As Longa = State(1)
b = State(2)
C = State(3)
D = State(4)Decode 64, X, Buffer' Round 1
FF a, b, C, D, X(0), S11, -680876936
FF D, a, b, C, X(1), S12, -389564586
FF C, D, a, b, X(2), S13, 606105819
FF b, C, D, a, X(3), S14, -1044525330
FF a, b, C, D, X(4), S11, -176418897
FF D, a, b, C, X(5), S12, 1200080426
FF C, D, a, b, X(6), S13, -1473231341
FF b, C, D, a, X(7), S14, -45705983
FF a, b, C, D, X(8), S11, 1770035416
FF D, a, b, C, X(9), S12, -1958414417
FF C, D, a, b, X(10), S13, -42063
FF b, C, D, a, X(11), S14, -1990404162
FF a, b, C, D, X(12), S11, 1804603682
FF D, a, b, C, X(13), S12, -40341101
FF C, D, a, b, X(14), S13, -1502002290
FF b, C, D, a, X(15), S14, 1236535329' Round 2
GG a, b, C, D, X(1), S21, -165796510
GG D, a, b, C, X(6), S22, -1069501632
GG C, D, a, b, X(11), S23, 643717713
GG b, C, D, a, X(0), S24, -373897302
GG a, b, C, D, X(5), S21, -701558691
GG D, a, b, C, X(10), S22, 38016083
GG C, D, a, b, X(15), S23, -660478335
GG b, C, D, a, X(4), S24, -405537848
GG a, b, C, D, X(9), S21, 568446438
GG D, a, b, C, X(14), S22, -1019803690
GG C, D, a, b, X(3), S23, -187363961
GG b, C, D, a, X(8), S24, 1163531501
GG a, b, C, D, X(13), S21, -1444681467
GG D, a, b, C, X(2), S22, -51403784
GG C, D, a, b, X(7), S23, 1735328473
GG b, C, D, a, X(12), S24, -1926607734' Round 3
HH a, b, C, D, X(5), S31, -378558
HH D, a, b, C, X(8), S32, -2022574463
HH C, D, a, b, X(11), S33, 1839030562
HH b, C, D, a, X(14), S34, -35309556
HH a, b, C, D, X(1), S31, -1530992060
HH D, a, b, C, X(4), S32, 1272893353
HH C, D, a, b, X(7), S33, -155497632
HH b, C, D, a, X(10), S34, -1094730640
HH a, b, C, D, X(13), S31, 681279174
HH D, a, b, C, X(0), S32, -358537222
HH C, D, a, b, X(3), S33, -722521979
HH b, C, D, a, X(6), S34, 76029189
HH a, b, C, D, X(9), S31, -640364487
HH D, a, b, C, X(12), S32, -421815835
HH C, D, a, b, X(15), S33, 530742520
HH b, C, D, a, X(2), S34, -995338651' Round 4
II a, b, C, D, X(0), S41, -198630844
II D, a, b, C, X(7), S42, 1126891415
II C, D, a, b, X(14), S43, -1416354905
II b, C, D, a, X(5), S44, -57434055
II a, b, C, D, X(12), S41, 1700485571
II D, a, b, C, X(3), S42, -1894986606
II C, D, a, b, X(10), S43, -1051523
II b, C, D, a, X(1), S44, -2054922799
II a, b, C, D, X(8), S41, 1873313359
II D, a, b, C, X(15), S42, -30611744
II C, D, a, b, X(6), S43, -1560198380
II b, C, D, a, X(13), S44, 1309151649
II a, b, C, D, X(4), S41, -145523070
II D, a, b, C, X(11), S42, -1120210379
II C, D, a, b, X(2), S43, 718787259
II b, C, D, a, X(9), S44, -343485551
State(1) = LongOverflowAdd(State(1), a)
State(2) = LongOverflowAdd(State(2), b)
State(3) = LongOverflowAdd(State(3), C)
State(4) = LongOverflowAdd(State(4), D)
'/* Zeroize sensitive information.
'*/
'MD5_memset ((POINTER)x, 0, sizeof (x));
End SubPrivate Sub Decode(Length As Integer, OutputBuffer() As Long, InputBuffer() As Byte)
Dim intDblIndex As Integer
Dim intByteIndex As Integer
Dim dblSum As DoubleintDblIndex = 0
For intByteIndex = 0 To Length - 1 Step 4
dblSum = InputBuffer(intByteIndex) + _
InputBuffer(intByteIndex + 1) * 256# + _
InputBuffer(intByteIndex + 2) * 65536# + _
InputBuffer(intByteIndex + 3) * 16777216#
OutputBuffer(intDblIndex) = UnsignedToLong(dblSum)
intDblIndex = intDblIndex + 1
Next intByteIndex
End Sub'
' FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
' Rotation is separate from addition to prevent recomputation.
'
Private Function FF(a As Long, _
b As Long, _
C As Long, _
D As Long, _
X As Long, _
S As Long, _
ac As Long) As Long
a = LongOverflowAdd4(a, (b And C) Or (Not (b) And D), X, ac)
a = LongLeftRotate(a, S)
a = LongOverflowAdd(a, b)
End FunctionPrivate Function GG(a As Long, _
b As Long, _
C As Long, _
D As Long, _
X As Long, _
S As Long, _
ac As Long) As Long
a = LongOverflowAdd4(a, (b And D) Or (C And Not (D)), X, ac)
a = LongLeftRotate(a, S)
a = LongOverflowAdd(a, b)
End FunctionPrivate Function HH(a As Long, _
b As Long, _
C As Long, _
D As Long, _
X As Long, _
S As Long, _
ac As Long) As Long
a = LongOverflowAdd4(a, b Xor C Xor D, X, ac)
a = LongLeftRotate(a, S)
a = LongOverflowAdd(a, b)
End FunctionPrivate Function II(a As Long, _
b As Long, _
C As Long, _
D As Long, _
X As Long, _
S As Long, _
ac As Long) As Long
a = LongOverflowAdd4(a, C Xor (b Or Not (D)), X, ac)
a = LongLeftRotate(a, S)
a = LongOverflowAdd(a, b)
End Function'
' Rotate a long to the right
'
Private Function LongLeftRotate(value As Long, bits As Long) As Long
Dim lngSign As Long
Dim lngI As Long
bits = bits Mod 32
If bits = 0 Then LongLeftRotate = value: Exit Function
For lngI = 1 To bits
lngSign = value And &HC0000000
value = (value And &H3FFFFFFF) * 2
value = value Or ((lngSign < 0) And 1) Or (CBool(lngSign And _
&H40000000) And &H80000000)
Next
LongLeftRotate = value
End Function'
' Function to add two unsigned numbers together as in C.
' Overflows are ignored!
'
Private Function LongOverflowAdd(Val1 As Long, Val2 As Long) As Long
Dim lngHighWord As Long
Dim lngLowWord As Long
Dim lngOverflow As LonglngLowWord = (Val1 And &HFFFF&) + (Val2 And &HFFFF&)
lngOverflow = lngLowWord \ 65536
lngHighWord = (((Val1 And &HFFFF0000) \ 65536) + ((Val2 And &HFFFF0000) \ 65536) + lngOverflow) And &HFFFF&
LongOverflowAdd = UnsignedToLong((lngHighWord * 65536#) + (lngLowWord And &HFFFF&))
End Function'
' Function to add two unsigned numbers together as in C.
' Overflows are ignored!
'
Private Function LongOverflowAdd4(Val1 As Long, Val2 As Long, val3 As Long, val4 As Long) As Long
Dim lngHighWord As Long
Dim lngLowWord As Long
Dim lngOverflow As LonglngLowWord = (Val1 And &HFFFF&) + (Val2 And &HFFFF&) + (val3 And &HFFFF&) + (val4 And &HFFFF&)
lngOverflow = lngLowWord \ 65536
lngHighWord = (((Val1 And &HFFFF0000) \ 65536) + _
((Val2 And &HFFFF0000) \ 65536) + _
((val3 And &HFFFF0000) \ 65536) + _
((val4 And &HFFFF0000) \ 65536) + _
lngOverflow) And &HFFFF&
LongOverflowAdd4 = UnsignedToLong((lngHighWord * 65536#) + (lngLowWord And &HFFFF&))
End Function'
' Convert an unsigned double into a long
'
Private Function UnsignedToLong(value As Double) As Long
If value < 0 Or value >= OFFSET_4 Then Error 6 ' Overflow
If value <= MAXINT_4 Then
UnsignedToLong = value
Else
UnsignedToLong = value - OFFSET_4
End If
End Function'
' Convert a long to an unsigned Double
'
Private Function LongToUnsigned(value As Long) As Double
If value < 0 Then
LongToUnsigned = value + OFFSET_4
Else
LongToUnsigned = value
End If
End Function