Our AES library:
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'Option Explicit
' Rijndael.asp
' Copyright 2001 Phil Fresle
' phil@frez.co.uk
' http://www.frez.co.uk
' Implementation of the AES Rijndael Block Cipher. Inspired by Mike Scott's
' implementation in C. Permission for free direct or derivative use is granted
' subject to compliance with any conditions that the originators of the
' algorithm place on its exploitation.
' 3-Apr-2001: Functions added to the bottom for encrypting/decrypting large
' arrays of data. The entire length of the array is inserted as the first four
' bytes onto the front of the first block of the resultant byte array before
' encryption.
' 19-Apr-2001: Thanks to Paolo Migliaccio for finding a bug with 256 bit
' key. Problem was in the gkey function. Now properly matches NIST values.
Private m_lOnBits(30)
Private m_l2Power(30)
Private m_bytOnBits(7)
Private m_byt2Power(7)
Private m_InCo(3)
Private m_fbsub(255)
Private m_rbsub(255)
Private m_ptab(255)
Private m_ltab(255)
Private m_ftable(255)
Private m_rtable(255)
Private m_rco(29)
Private m_Nk
Private m_Nb
Private m_Nr
Private m_fi(23)
Private m_ri(23)
Private m_fkey(119)
Private m_rkey(119)
m_InCo(0) = &HB
m_InCo(1) = &HD
m_InCo(2) = &H9
m_InCo(3) = &HE
m_bytOnBits(0) = 1
m_bytOnBits(1) = 3
m_bytOnBits(2) = 7
m_bytOnBits(3) = 15
m_bytOnBits(4) = 31
m_bytOnBits(5) = 63
m_bytOnBits(6) = 127
m_bytOnBits(7) = 255
m_byt2Power(0) = 1
m_byt2Power(1) = 2
m_byt2Power(2) = 4
m_byt2Power(3) = 8
m_byt2Power(4) = 16
m_byt2Power(5) = 32
m_byt2Power(6) = 64
m_byt2Power(7) = 128
m_lOnBits(0) = 1
m_lOnBits(1) = 3
m_lOnBits(2) = 7
m_lOnBits(3) = 15
m_lOnBits(4) = 31
m_lOnBits(5) = 63
m_lOnBits(6) = 127
m_lOnBits(7) = 255
m_lOnBits(8) = 511
m_lOnBits(9) = 1023
m_lOnBits(10) = 2047
m_lOnBits(11) = 4095
m_lOnBits(12) = 8191
m_lOnBits(13) = 16383
m_lOnBits(14) = 32767
m_lOnBits(15) = 65535
m_lOnBits(16) = 131071
m_lOnBits(17) = 262143
m_lOnBits(18) = 524287
m_lOnBits(19) = 1048575
m_lOnBits(20) = 2097151
m_lOnBits(21) = 4194303
m_lOnBits(22) = 8388607
m_lOnBits(23) = 16777215
m_lOnBits(24) = 33554431
m_lOnBits(25) = 67108863
m_lOnBits(26) = 134217727
m_lOnBits(27) = 268435455
m_lOnBits(28) = 536870911
m_lOnBits(29) = 1073741823
m_lOnBits(30) = 2147483647
m_l2Power(0) = 1
m_l2Power(1) = 2
m_l2Power(2) = 4
m_l2Power(3) = 8
m_l2Power(4) = 16
m_l2Power(5) = 32
m_l2Power(6) = 64
m_l2Power(7) = 128
m_l2Power(8) = 256
m_l2Power(9) = 512
m_l2Power(10) = 1024
m_l2Power(11) = 2048
m_l2Power(12) = 4096
m_l2Power(13) = 8192
m_l2Power(14) = 16384
m_l2Power(15) = 32768
m_l2Power(16) = 65536
m_l2Power(17) = 131072
m_l2Power(18) = 262144
m_l2Power(19) = 524288
m_l2Power(20) = 1048576
m_l2Power(21) = 2097152
m_l2Power(22) = 4194304
m_l2Power(23) = 8388608
m_l2Power(24) = 16777216
m_l2Power(25) = 33554432
m_l2Power(26) = 67108864
m_l2Power(27) = 134217728
m_l2Power(28) = 268435456
m_l2Power(29) = 536870912
m_l2Power(30) = 1073741824
Private Function LShift(lValue, iShiftBits)
If iShiftBits = 0 Then
LShift = lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValue And 1 Then
LShift = &H80000000
Else
LShift = 0
End If
Exit Function
ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
Err.Raise 6
End If
If (lValue And m_l2Power(31 - iShiftBits)) Then
LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000
Else
LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
End If
End Function
Private Function RShift(lValue, iShiftBits)
If iShiftBits = 0 Then
RShift = lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValue And &H80000000 Then
RShift = 1
Else
RShift = 0
End If
Exit Function
ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
Err.Raise 6
End If
RShift = (lValue And &H7FFFFFFE) \ m_l2Power(iShiftBits)
If (lValue And &H80000000) Then
RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - 1)))
End If
End Function
Private Function LShiftByte(bytValue, bytShiftBits)
If bytShiftBits = 0 Then
LShiftByte = bytValue
Exit Function
ElseIf bytShiftBits = 7 Then
If bytValue And 1 Then
LShiftByte = &H80
Else
LShiftByte = 0
End If
Exit Function
ElseIf bytShiftBits < 0 Or bytShiftBits > 7 Then
Err.Raise 6
End If
LShiftByte = ((bytValue And m_bytOnBits(7 - bytShiftBits)) * m_byt2Power(bytShiftBits))
End Function
Private Function RShiftByte(bytValue, bytShiftBits)
If bytShiftBits = 0 Then
RShiftByte = bytValue
Exit Function
ElseIf bytShiftBits = 7 Then
If bytValue And &H80 Then
RShiftByte = 1
Else
RShiftByte = 0
End If
Exit Function
ElseIf bytShiftBits < 0 Or bytShiftBits > 7 Then
Err.Raise 6
End If
RShiftByte = bytValue \ m_byt2Power(bytShiftBits)
End Function
Private Function RotateLeft(lValue, iShiftBits)
RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
End Function
Private Function RotateLeftByte(bytValue, bytShiftBits)
RotateLeftByte = LShiftByte(bytValue, bytShiftBits) Or RShiftByte(bytValue, (8 - bytShiftBits))
End Function
Private Function Pack(b())
Dim lCount
Dim lTemp
For lCount = 0 To 3
lTemp = b(lCount)
Pack = Pack Or LShift(lTemp, (lCount * 8))
Next
End Function
Private Function PackFrom(b(), k)
Dim lCount
Dim lTemp
For lCount = 0 To 3
lTemp = b(lCount + k)
PackFrom = PackFrom Or LShift(lTemp, (lCount * 8))
Next
End Function
Private Sub Unpack(a, b())
b(0) = a And m_lOnBits(7)
b(1) = RShift(a, 8) And m_lOnBits(7)
b(2) = RShift(a, 16) And m_lOnBits(7)
b(3) = RShift(a, 24) And m_lOnBits(7)
End Sub
Private Sub UnpackFrom(a, b(), k)
b(0 + k) = a And m_lOnBits(7)
b(1 + k) = RShift(a, 8) And m_lOnBits(7)
b(2 + k) = RShift(a, 16) And m_lOnBits(7)
b(3 + k) = RShift(a, 24) And m_lOnBits(7)
End Sub
Private Function xtime(a)
Dim b
If (a And &H80) Then
b = &H1B
Else
b = 0
End If
xtime = LShiftByte(a, 1)
xtime = xtime Xor b
End Function
Private Function bmul(x, y)
If x <> 0 And y <> 0 Then
bmul = m_ptab((CLng(m_ltab(x)) + CLng(m_ltab(y))) Mod 255)
Else
bmul = 0
End If
End Function
Private Function SubByte(a)
Dim b(3)
Unpack a, b
b(0) = m_fbsub(b(0))
b(1) = m_fbsub(b(1))
b(2) = m_fbsub(b(2))
b(3) = m_fbsub(b(3))
SubByte = Pack(b)
End Function
Private Function product(x, y)
Dim xb(3)
Dim yb(3)
Unpack x, xb
Unpack y, yb
product = bmul(xb(0), yb(0)) Xor bmul(xb(1), yb(1)) Xor bmul(xb(2), yb(2)) Xor bmul(xb(3), yb(3))
End Function
Private Function InvMixCol(x)
Dim y
Dim m
Dim b(3)
m = Pack(m_InCo)
b(3) = product(m, x)
m = RotateLeft(m, 24)
b(2) = product(m, x)
m = RotateLeft(m, 24)
b(1) = product(m, x)
m = RotateLeft(m, 24)
b(0) = product(m, x)
y = Pack(b)
InvMixCol = y
End Function
Private Function ByteSub(x)
Dim y
Dim z
z = x
y = m_ptab(255 - m_ltab(z))
z = y
z = RotateLeftByte(z, 1)
y = y Xor z
z = RotateLeftByte(z, 1)
y = y Xor z
z = RotateLeftByte(z, 1)
y = y Xor z
z = RotateLeftByte(z, 1)
y = y Xor z
y = y Xor &H63
ByteSub = y
End Function
Public Sub gentables()
Dim i
Dim y
Dim b(3)
Dim ib
m_ltab(0) = 0
m_ptab(0) = 1
m_ltab(1) = 0
m_ptab(1) = 3
m_ltab(3) = 1
For i = 2 To 255
m_ptab(i) = m_ptab(i - 1) Xor xtime(m_ptab(i - 1))
m_ltab(m_ptab(i)) = i
Next
m_fbsub(0) = &H63
m_rbsub(&H63) = 0
For i = 1 To 255
ib = i
y = ByteSub(ib)
m_fbsub(i) = y
m_rbsub(y) = i
Next
y = 1
For i = 0 To 29
m_rco(i) = y
y = xtime(y)
Next
For i = 0 To 255
y = m_fbsub(i)
b(3) = y Xor xtime(y)
b(2) = y
b(1) = y
b(0) = xtime(y)
m_ftable(i) = Pack(b)
y = m_rbsub(i)
b(3) = bmul(m_InCo(0), y)
b(2) = bmul(m_InCo(1), y)
b(1) = bmul(m_InCo(2), y)
b(0) = bmul(m_InCo(3), y)
m_rtable(i) = Pack(b)
Next
End Sub
Public Sub gkey(nb, nk, key())
Dim i
Dim j
Dim k
Dim m
Dim N
Dim C1
Dim C2
Dim C3
Dim CipherKey(7)
m_Nb = nb
m_Nk = nk
If m_Nb >= m_Nk Then
m_Nr = 6 + m_Nb
Else
m_Nr = 6 + m_Nk
End If
C1 = 1
If m_Nb < 8 Then
C2 = 2
C3 = 3
Else
C2 = 3
C3 = 4
End If
For j = 0 To nb - 1
m = j * 3
m_fi(m) = (j + C1) Mod nb
m_fi(m + 1) = (j + C2) Mod nb
m_fi(m + 2) = (j + C3) Mod nb
m_ri(m) = (nb + j - C1) Mod nb
m_ri(m + 1) = (nb + j - C2) Mod nb
m_ri(m + 2) = (nb + j - C3) Mod nb
Next
N = m_Nb * (m_Nr + 1)
For i = 0 To m_Nk - 1
j = i * 4
CipherKey(i) = PackFrom(key, j)
Next
For i = 0 To m_Nk - 1
m_fkey(i) = CipherKey(i)
Next
j = m_Nk
k = 0
Do While j < N
m_fkey(j) = m_fkey(j - m_Nk) Xor _
SubByte(RotateLeft(m_fkey(j - 1), 24)) Xor m_rco(k)
If m_Nk <= 6 Then
i = 1
Do While i < m_Nk And (i + j) < N
m_fkey(i + j) = m_fkey(i + j - m_Nk) Xor _
m_fkey(i + j - 1)
i = i + 1
Loop
Else
i = 1
Do While i < 4 And (i + j) < N
m_fkey(i + j) = m_fkey(i + j - m_Nk) Xor _
m_fkey(i + j - 1)
i = i + 1
Loop
If j + 4 < N Then
m_fkey(j + 4) = m_fkey(j + 4 - m_Nk) Xor _
SubByte(m_fkey(j + 3))
End If
i = 5
Do While i < m_Nk And (i + j) < N
m_fkey(i + j) = m_fkey(i + j - m_Nk) Xor _
m_fkey(i + j - 1)
i = i + 1
Loop
End If
j = j + m_Nk
k = k + 1
Loop
For j = 0 To m_Nb - 1
m_rkey(j + N - nb) = m_fkey(j)
Next
i = m_Nb
Do While i < N - m_Nb
k = N - m_Nb - i
For j = 0 To m_Nb - 1
m_rkey(k + j) = InvMixCol(m_fkey(i + j))
Next
i = i + m_Nb
Loop
j = N - m_Nb
Do While j < N
m_rkey(j - N + m_Nb) = m_fkey(j)
j = j + 1
Loop
End Sub
Public Sub encrypt(buff())
Dim i
Dim j
Dim k
Dim m
Dim a(7)
Dim b(7)
Dim x
Dim y
Dim t
For i = 0 To m_Nb - 1
j = i * 4
a(i) = PackFrom(buff, j)
a(i) = a(i) Xor m_fkey(i)
Next
k = m_Nb
x = a
y = b
For i = 1 To m_Nr - 1
For j = 0 To m_Nb - 1
m = j * 3
y(j) = m_fkey(k) Xor m_ftable(x(j) And m_lOnBits(7)) Xor _
RotateLeft(m_ftable(RShift(x(m_fi(m)), 8) And m_lOnBits(7)), 8) Xor _
RotateLeft(m_ftable(RShift(x(m_fi(m + 1)), 16) And m_lOnBits(7)), 16) Xor _
RotateLeft(m_ftable(RShift(x(m_fi(m + 2)), 24) And m_lOnBits(7)), 24)
k = k + 1
Next
t = x
x = y
y = t
Next
For j = 0 To m_Nb - 1
m = j * 3
y(j) = m_fkey(k) Xor m_fbsub(x(j) And m_lOnBits(7)) Xor _
RotateLeft(m_fbsub(RShift(x(m_fi(m)), 8) And m_lOnBits(7)), 8) Xor _
RotateLeft(m_fbsub(RShift(x(m_fi(m + 1)), 16) And m_lOnBits(7)), 16) Xor _
RotateLeft(m_fbsub(RShift(x(m_fi(m + 2)), 24) And m_lOnBits(7)), 24)
k = k + 1
Next
For i = 0 To m_Nb - 1
j = i * 4
UnpackFrom y(i), buff, j
x(i) = 0
y(i) = 0
Next
End Sub
Public Sub decrypt(buff())
Dim i
Dim j
Dim k
Dim m
Dim a(7)
Dim b(7)
Dim x
Dim y
Dim t
For i = 0 To m_Nb - 1
j = i * 4
a(i) = PackFrom(buff, j)
a(i) = a(i) Xor m_rkey(i)
Next
k = m_Nb
x = a
y = b
For i = 1 To m_Nr - 1
For j = 0 To m_Nb - 1
m = j * 3
y(j) = m_rkey(k) Xor m_rtable(x(j) And m_lOnBits(7)) Xor _
RotateLeft(m_rtable(RShift(x(m_ri(m)), 8) And m_lOnBits(7)), 8) Xor _
RotateLeft(m_rtable(RShift(x(m_ri(m + 1)), 16) And m_lOnBits(7)), 16) Xor _
RotateLeft(m_rtable(RShift(x(m_ri(m + 2)), 24) And m_lOnBits(7)), 24)
k = k + 1
Next
t = x
x = y
y = t
Next
For j = 0 To m_Nb - 1
m = j * 3
y(j) = m_rkey(k) Xor m_rbsub(x(j) And m_lOnBits(7)) Xor _
RotateLeft(m_rbsub(RShift(x(m_ri(m)), 8) And m_lOnBits(7)), 8) Xor _
RotateLeft(m_rbsub(RShift(x(m_ri(m + 1)), 16) And m_lOnBits(7)), 16) Xor _
RotateLeft(m_rbsub(RShift(x(m_ri(m + 2)), 24) And m_lOnBits(7)), 24)
k = k + 1
Next
For i = 0 To m_Nb - 1
j = i * 4
UnpackFrom y(i), buff, j
x(i) = 0
y(i) = 0
Next
End Sub
Private Function IsInitialized(vArray)
On Error Resume Next
IsInitialized = IsNumeric(UBound(vArray))
End Function
Private Sub CopyBytesASP(bytDest, lDestStart, bytSource(), lSourceStart, lLength)
Dim lCount
lCount = 0
Do
bytDest(lDestStart + lCount) = bytSource(lSourceStart + lCount)
lCount = lCount + 1
Loop Until lCount = lLength
End Sub
Public Function EncryptData(bytMessage, bytPassword)
Dim bytKey(31)
Dim bytIn()
Dim bytOut()
Dim bytTemp(31)
Dim lCount
Dim lLength
Dim lEncodedLength
Dim bytLen(3)
Dim lPosition
If Not IsInitialized(bytMessage) Then
Exit Function
End If
If Not IsInitialized(bytPassword) Then
Exit Function
End If
For lCount = 0 To UBound(bytPassword)
bytKey(lCount) = bytPassword(lCount)
If lCount = 31 Then
Exit For
End If
Next
gentables
gkey 8, 8, bytKey
lLength = UBound(bytMessage) + 1
lEncodedLength = lLength + 4
If lEncodedLength Mod 32 <> 0 Then
lEncodedLength = lEncodedLength + 32 - (lEncodedLength Mod 32)
End If
ReDim bytIn(lEncodedLength - 1)
ReDim bytOut(lEncodedLength - 1)
Unpack lLength, bytIn
CopyBytesASP bytIn, 4, bytMessage, 0, lLength
For lCount = 0 To lEncodedLength - 1 Step 32
CopyBytesASP bytTemp, 0, bytIn, lCount, 32
Encrypt bytTemp
CopyBytesASP bytOut, lCount, bytTemp, 0, 32
Next
EncryptData = bytOut
End Function
Public Function DecryptData(bytIn, bytPassword)
Dim bytMessage()
Dim bytKey(31)
Dim bytOut()
Dim bytTemp(31)
Dim lCount
Dim lLength
Dim lEncodedLength
Dim bytLen(3)
Dim lPosition
If Not IsInitialized(bytIn) Then
Exit Function
End If
If Not IsInitialized(bytPassword) Then
Exit Function
End If
lEncodedLength = UBound(bytIn) + 1
If lEncodedLength Mod 32 <> 0 Then
Exit Function
End If
For lCount = 0 To UBound(bytPassword)
bytKey(lCount) = bytPassword(lCount)
If lCount = 31 Then
Exit For
End If
Next
gentables
gkey 8, 8, bytKey
ReDim bytOut(lEncodedLength - 1)
For lCount = 0 To lEncodedLength - 1 Step 32
CopyBytesASP bytTemp, 0, bytIn, lCount, 32
Decrypt bytTemp
CopyBytesASP bytOut, lCount, bytTemp, 0, 32
Next
lLength = Pack(bytOut)
If lLength > lEncodedLength - 4 Then
Exit Function
End If
ReDim bytMessage(lLength - 1)
CopyBytesASP bytMessage, 0, bytOut, 4, lLength
DecryptData = bytMessage
End Function
Function AESEncrypt(sPlain, sPassword)
Dim bytIn()
Dim bytOut
'Dim hexPassword()
Dim bytPassword()
Dim lCount
Dim lLength
Dim sTemp
'*** Plain text message ***
lLength = Len(sPlain)
ReDim bytIn(lLength-1)
For lCount = 1 To lLength
bytIn(lCount-1) = CByte(AscB(Mid(sPlain,lCount,1)))
Next
'*** Password ***
lLength = Len(sPassword)
'ReDim hexPassword(lLength-1)
ReDim bytPassword(lLength-1)
' '*** Convert Hex to bytes ***
' response.write "Password in HEX<br>"
' For lCount = 1 To lLength
' hexPassword(lCount-1) = Hex(AscB(Mid(sPassword,lCount,1)))
'
' response.write AscB(Mid(sPassword,lCount,1)) & "=" & hexPassword(lCount-1) & "<br> "
'
' Next
'*** Convert to bytes ***
response.write "Password in Bytes<br>"
For lCount = 1 To lLength
bytPassword(lCount-1) = AscB(Mid(sPassword,lCount,1))'hexPassword(lCount-1)
response.write "" & bytPassword(lCount-1) & " "
Next
response.write "<br/>"
bytOut = EncryptData(bytIn, bytPassword)
sTemp = ""
For lCount = 0 To UBound(bytOut)
sTemp = sTemp & Right("0" & Hex(bytOut(lCount)), 2)
Next
AESEncrypt = sTemp
End Function
Function BAK_AESEncrypt(sPlain, sPassword)
Dim bytIn()
Dim bytOut
Dim bytPassword()
Dim lCount
Dim lLength
Dim sTemp
lLength = Len(sPlain)
ReDim bytIn(lLength-1)
For lCount = 1 To lLength
bytIn(lCount-1) = CByte(AscB(Mid(sPlain,lCount,1)))
Next
lLength = Len(sPassword)
ReDim bytPassword(lLength-1)
For lCount = 1 To lLength
bytPassword(lCount-1) = CByte(AscB(Mid(sPassword,lCount,1)))
response.write "" & bytPassword(lCount-1) & " "
Next
For lCount = 1 To lLength
bytPassword(lCount-1) = CByte(AscB(Mid(sPassword,lCount,1)))
response.write "" & Hex( bytPassword(lCount-1)) & " "
Next
response.write "<br/>"
bytOut = EncryptData(bytIn, bytPassword)
sTemp = ""
For lCount = 0 To UBound(bytOut)
sTemp = sTemp & Right("0" & Hex(bytOut(lCount)), 2)
Next
AESEncrypt = sTemp
End Function
Function AESDecrypt(sCypher, sPassword)
Dim bytIn()
Dim bytOut
Dim bytPassword()
Dim lCount
Dim lLength
Dim sTemp
lLength = Len(sCypher)
ReDim bytIn(lLength/2-1)
For lCount = 0 To lLength/2-1
bytIn(lCount) = CByte("&H" & Mid(sCypher,lCount*2+1,2))
Next
lLength = Len(sPassword)
ReDim bytPassword(lLength-1)
For lCount = 1 To lLength
bytPassword(lCount-1) = CByte(AscB(Mid(sPassword,lCount,1)))
Next
bytOut = DecryptData(bytIn, bytPassword)
'Send in the hex password directly ... MD 8.24.09
'bytOut = DecryptData(bytIn, sPassword)
lLength = UBound(bytOut) + 1
sTemp = ""
For lCount = 0 To lLength - 1
sTemp = sTemp & Chr(bytOut(lCount))
Next
AESDecrypt = sTemp
End Function
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by: BadotzPosted on 2009-08-25 at 09:37:18ID: 25179395
Why not ask the "third party system" what they use, and see if it is applicable?