'CLS:
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "CRijndael"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
' Credits : Phil Fresle
Option Explicit
Private m_lOnBits(30) As Long
Private m_l2Power(30) As Long
Private m_bytOnBits(7) As Byte
Private m_byt2Power(7) As Byte
Private m_InCo(3) As Byte
Private m_fbsub(255) As Byte
Private m_rbsub(255) As Byte
Private m_ptab(255) As Byte
Private m_ltab(255) As Byte
Private m_ftable(255) As Long
Private m_rtable(255) As Long
Private m_rco(29) As Long
Private m_Nk As Long
Private m_Nb As Long
Private m_Nr As Long
Private m_fi(23) As Byte
Private m_ri(23) As Byte
Private m_fkey(119) As Long
Private m_rkey(119) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal Destination As Any, ByVal Source As Any, ByVal Length As Long)
Private Sub Class_Initialize()
m_InCo(0) = &HB: m_InCo(1) = &HD
m_InCo(2) = &H9: m_InCo(3) = &HE
m_bytOnBits(0) = 1 ' 00000001
m_bytOnBits(1) = 3 ' 00000011
m_bytOnBits(2) = 7 ' 00000111
m_bytOnBits(3) = 15 ' 00001111
m_bytOnBits(4) = 31 ' 00011111
m_bytOnBits(5) = 63 ' 00111111
m_bytOnBits(6) = 127 ' 01111111
m_bytOnBits(7) = 255 ' 11111111
m_byt2Power(0) = 1 ' 00000001
m_byt2Power(1) = 2 ' 00000010
m_byt2Power(2) = 4 ' 00000100
m_byt2Power(3) = 8 ' 00001000
m_byt2Power(4) = 16 ' 00010000
m_byt2Power(5) = 32 ' 00100000
m_byt2Power(6) = 64 ' 01000000
m_byt2Power(7) = 128 ' 10000000
m_lOnBits(0) = 1 ' 00000000000000000000000000000001
m_lOnBits(1) = 3 ' 00000000000000000000000000000011
m_lOnBits(2) = 7 ' 00000000000000000000000000000111
m_lOnBits(3) = 15 ' 00000000000000000000000000001111
m_lOnBits(4) = 31 ' 00000000000000000000000000011111
m_lOnBits(5) = 63 ' 00000000000000000000000000111111
m_lOnBits(6) = 127 ' 00000000000000000000000001111111
m_lOnBits(7) = 255 ' 00000000000000000000000011111111
m_lOnBits(8) = 511 ' 00000000000000000000000111111111
m_lOnBits(9) = 1023 ' 00000000000000000000001111111111
m_lOnBits(10) = 2047 ' 00000000000000000000011111111111
m_lOnBits(11) = 4095 ' 00000000000000000000111111111111
m_lOnBits(12) = 8191 ' 00000000000000000001111111111111
m_lOnBits(13) = 16383 ' 00000000000000000011111111111111
m_lOnBits(14) = 32767 ' 00000000000000000111111111111111
m_lOnBits(15) = 65535 ' 00000000000000001111111111111111
m_lOnBits(16) = 131071 ' 00000000000000011111111111111111
m_lOnBits(17) = 262143 ' 00000000000000111111111111111111
m_lOnBits(18) = 524287 ' 00000000000001111111111111111111
m_lOnBits(19) = 1048575 ' 00000000000011111111111111111111
m_lOnBits(20) = 2097151 ' 00000000000111111111111111111111
m_lOnBits(21) = 4194303 ' 00000000001111111111111111111111
m_lOnBits(22) = 8388607 ' 00000000011111111111111111111111
m_lOnBits(23) = 16777215 ' 00000000111111111111111111111111
m_lOnBits(24) = 33554431 ' 00000001111111111111111111111111
m_lOnBits(25) = 67108863 ' 00000011111111111111111111111111
m_lOnBits(26) = 134217727 ' 00000111111111111111111111111111
m_lOnBits(27) = 268435455 ' 00001111111111111111111111111111
m_lOnBits(28) = 536870911 ' 00011111111111111111111111111111
m_lOnBits(29) = 1073741823 ' 00111111111111111111111111111111
m_lOnBits(30) = 2147483647 ' 01111111111111111111111111111111
m_l2Power(0) = 1 ' 00000000000000000000000000000001
m_l2Power(1) = 2 ' 00000000000000000000000000000010
m_l2Power(2) = 4 ' 00000000000000000000000000000100
m_l2Power(3) = 8 ' 00000000000000000000000000001000
m_l2Power(4) = 16 ' 00000000000000000000000000010000
m_l2Power(5) = 32 ' 00000000000000000000000000100000
m_l2Power(6) = 64 ' 00000000000000000000000001000000
m_l2Power(7) = 128 ' 00000000000000000000000010000000
m_l2Power(8) = 256 ' 00000000000000000000000100000000
m_l2Power(9) = 512 ' 00000000000000000000001000000000
m_l2Power(10) = 1024 ' 00000000000000000000010000000000
m_l2Power(11) = 2048 ' 00000000000000000000100000000000
m_l2Power(12) = 4096 ' 00000000000000000001000000000000
m_l2Power(13) = 8192 ' 00000000000000000010000000000000
m_l2Power(14) = 16384 ' 00000000000000000100000000000000
m_l2Power(15) = 32768 ' 00000000000000001000000000000000
m_l2Power(16) = 65536 ' 00000000000000010000000000000000
m_l2Power(17) = 131072 ' 00000000000000100000000000000000
m_l2Power(18) = 262144 ' 00000000000001000000000000000000
m_l2Power(19) = 524288 ' 00000000000010000000000000000000
m_l2Power(20) = 1048576 ' 00000000000100000000000000000000
m_l2Power(21) = 2097152 ' 00000000001000000000000000000000
m_l2Power(22) = 4194304 ' 00000000010000000000000000000000
m_l2Power(23) = 8388608 ' 00000000100000000000000000000000
m_l2Power(24) = 16777216 ' 00000001000000000000000000000000
m_l2Power(25) = 33554432 ' 00000010000000000000000000000000
m_l2Power(26) = 67108864 ' 00000100000000000000000000000000
m_l2Power(27) = 134217728 ' 00001000000000000000000000000000
m_l2Power(28) = 268435456 ' 00010000000000000000000000000000
m_l2Power(29) = 536870912 ' 00100000000000000000000000000000
m_l2Power(30) = 1073741824 ' 01000000000000000000000000000000
End Sub
Private Function LShift(ByVal lValue As Long, ByVal iShiftBits As Integer) As Long
If iShiftBits = 0 Then
LShift = lValue: Exit Function
ElseIf iShiftBits = 31 Then
LShift = IIf(lValue And 1, &H80000000, 0)
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(ByVal lValue As Long, ByVal iShiftBits As Integer) As Long
If iShiftBits = 0 Then
RShift = lValue: Exit Function
ElseIf iShiftBits = 31 Then
RShift = IIf(lValue And &H80000000, 1, 0)
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 Function
Private Function LShiftByte(ByVal bytValue As Byte, ByVal bytShiftBits As Byte) As Byte
If bytShiftBits = 0 Then
LShiftByte = bytValue: Exit Function
ElseIf bytShiftBits = 7 Then
LShiftByte = IIf(bytValue And 1, &H80, 0)
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(ByVal bytValue As Byte, ByVal bytShiftBits As Byte) As Byte
If bytShiftBits = 0 Then
RShiftByte = bytValue: Exit Function
ElseIf bytShiftBits = 7 Then
RShiftByte = IIf(bytValue And &H80, 1, 0)
Exit Function
ElseIf bytShiftBits < 0 Or bytShiftBits > 7 Then
Err.Raise 6
End If
RShiftByte = bytValue \ m_byt2Power(bytShiftBits)
End Function
Private Function RotateLeft(ByVal lValue As Long, ByVal iShiftBits As Integer) As Long
RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
End Function
Private Function RotateLeftByte(ByVal bytValue As Byte, ByVal bytShiftBits As Byte) As Byte
RotateLeftByte = LShiftByte(bytValue, bytShiftBits) Or RShiftByte(bytValue, (8 - bytShiftBits))
End Function
Private Function Pack(b() As Byte) As Long
Dim lCount As Long, lTemp As Long
For lCount = 0 To 3
lTemp = b(lCount): Pack = Pack Or LShift(lTemp, (lCount * 8))
Next lCount
End Function
Private Function PackFrom(b() As Byte, ByVal k As Long) As Long
Dim lCount As Long, lTemp As Long
For lCount = 0 To 3
lTemp = b(lCount + k): PackFrom = PackFrom Or LShift(lTemp, (lCount * 8))
Next lCount
End Function
Private Sub Unpack(ByVal a As Long, b() As Byte)
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(ByVal a As Long, b() As Byte, ByVal k As Long)
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(ByVal a As Byte) As Byte
Dim b As Byte: b = IIf(a And &H80, &H1B, 0)
a = LShiftByte(a, 1): a = a Xor b: Xtime = a
End Function
Private Function Bmul(ByVal x As Byte, y As Byte) As Byte
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(ByVal a As Long) As Long
Dim b(3) As Byte
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(ByVal x As Long, ByVal y As Long) As Long
Dim xb(3) As Byte, yb(3) As Byte
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(ByVal x As Long) As Long
Dim y As Long, m As Long, b(3) As Byte
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(ByVal x As Byte) As Byte
Dim y As Byte
y = m_ptab(255 - m_ltab(x)): x = y
x = RotateLeftByte(x, 1): y = y Xor x
x = RotateLeftByte(x, 1): y = y Xor x
x = RotateLeftByte(x, 1): y = y Xor x
x = RotateLeftByte(x, 1): y = y Xor x
y = y Xor &H63: ByteSub = y
End Function
Private Sub gentables()
Dim i As Long, y As Byte
Dim b(3) As Byte, ib As Byte
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 i
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 i
y = 1
For i = 0 To 29
m_rco(i) = y: y = Xtime(y)
Next i
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 i
End Sub
Private Sub gkey(ByVal nb As Long, ByVal nk As Long, Key() As Byte)
Dim i As Long, j As Long, k As Long, m As Long
Dim N As Long, C1 As Long, C2 As Long, C3 As Long
Dim CipherKey(7) As Long
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 j
N = m_Nb * (m_Nr + 1)
For i = 0 To m_Nk - 1
j = i * 4: CipherKey(i) = PackFrom(Key, j)
Next i
For i = 0 To m_Nk - 1
m_fkey(i) = CipherKey(i)
Next i
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
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 j
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 j
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
Private Sub Encrypt(Buff() As Byte)
Dim i As Long, j As Long, k As Long, m As Long
Dim a(7) As Long, b(7) As Long, x() As Long
Dim y() As Long, t() As Long
For i = 0 To m_Nb - 1
j = i * 4: a(i) = PackFrom(Buff, j): a(i) = a(i) Xor m_fkey(i)
Next i
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 j
t = x: x = y: y = t
Next i
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 j
For i = 0 To m_Nb - 1
j = i * 4: UnpackFrom y(i), Buff, j: x(i) = 0: y(i) = 0
Next i
End Sub
Private Sub Decrypt(Buff() As Byte)
Dim i As Long, j As Long, k As Long, m As Long
Dim a(7) As Long, b(7) As Long, x() As Long
Dim y() As Long, t() As Long
For i = 0 To m_Nb - 1
j = i * 4: a(i) = PackFrom(Buff, j): a(i) = a(i) Xor m_rkey(i)
Next i
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 j
t = x: x = y: y = t
Next i
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 j
For i = 0 To m_Nb - 1
j = i * 4: UnpackFrom y(i), Buff, j: x(i) = 0: y(i) = 0
Next i
End Sub
Private Function IsInitialized(ByRef vArray As Variant) As Boolean
On Local Error Resume Next
IsInitialized = IsNumeric(UBound(vArray))
End Function
Public Function EncryptData(bytMessage() As Byte, bytPassword() As Byte) As Byte()
Dim bytKey(31) As Byte, bytIn() As Byte, bytOut() As Byte
Dim bytTemp(31) As Byte, lCount As Long, lLength As Long
Dim lEncodedLength As Long, bytLen(3) As Byte, lPosition As Long
If Not IsInitialized(bytMessage) Then Exit Function
If Not IsInitialized(bytPassword) Then Exit Function
For lCount = 0 To UBound(bytPassword)
bytKey(lCount) = bytPassword(lCount): If lCount = 31 Then Exit For
Next lCount
gentables
gkey 8, 8, bytKey
lLength = UBound(bytMessage) + 1: lEncodedLength = lLength + 4
If lEncodedLength Mod 32 0 Then lEncodedLength = lEncodedLength + 32 - (lEncodedLength Mod 32)
ReDim bytIn(lEncodedLength - 1): ReDim bytOut(lEncodedLength - 1)
CopyMemory VarPtr(bytIn(0)), VarPtr(lLength), 4
CopyMemory VarPtr(bytIn(4)), VarPtr(bytMessage(0)), lLength
For lCount = 0 To lEncodedLength - 1 Step 32
CopyMemory VarPtr(bytTemp(0)), VarPtr(bytIn(lCount)), 32
Encrypt bytTemp
CopyMemory VarPtr(bytOut(lCount)), VarPtr(bytTemp(0)), 32
Next lCount
EncryptData = bytOut
End Function
Public Function DecryptData(bytIn() As Byte, bytPassword() As Byte) As Byte()
Dim bytMessage() As Byte, bytKey(31) As Byte, bytOut() As Byte
Dim bytTemp(31) As Byte, lCount As Long, lLength As Long
Dim lEncodedLength As Long, bytLen(3) As Byte, lPosition As Long
If Not IsInitialized(bytIn) Then Exit Function
If Not IsInitialized(bytPassword) Then Exit Function
lEncodedLength = UBound(bytIn) + 1
If lEncodedLength Mod 32 0 Then Exit Function
For lCount = 0 To UBound(bytPassword)
bytKey(lCount) = bytPassword(lCount): If lCount = 31 Then Exit For
Next lCount
gentables
gkey 8, 8, bytKey
ReDim bytOut(lEncodedLength - 1)
For lCount = 0 To lEncodedLength - 1 Step 32
CopyMemory VarPtr(bytTemp(0)), VarPtr(bytIn(lCount)), 32
Decrypt bytTemp
CopyMemory VarPtr(bytOut(lCount)), VarPtr(bytTemp(0)), 32
Next lCount
CopyMemory VarPtr(lLength), VarPtr(bytOut(0)), 4
If lLength > lEncodedLength - 4 Then Exit Function
ReDim bytMessage(lLength - 1)
CopyMemory VarPtr(bytMessage(0)), VarPtr(bytOut(4)), lLength
DecryptData = bytMessage
End Function
====================================================================
'MODUL:
Attribute VB_Name = "modCryptText"
Option Explicit
' encrypt text messages using AES_Rijndael Block Cipher
' by Dipankar Basu.
Private oTest As CRijndael
Public Function strEncrypt(ByVal strMsg As String, ByVal pKey As String) As String
Dim ByteArray() As Byte, byteKey() As Byte, CryptText() As Byte
On Local Error Resume Next
' If strMsg = vbNullString Or pKey = vbNullString Then Exit Function
Set oTest = New CRijndael
ByteArray() = StrConv(strMsg, vbFromUnicode)
byteKey() = StrConv(pKey, vbFromUnicode)
CryptText() = oTest.EncryptData(ByteArray(), byteKey())
Set oTest = Nothing
strEncrypt = StrConv(CryptText(), vbUnicode)
End Function
Public Function strDecrypt(ByVal strMsg As String, ByVal pKey As String) As String
Dim ByteArray() As Byte, byteKey() As Byte, CryptText() As Byte
On Local Error Resume Next
' If strMsg = vbNullString Or pKey = vbNullString Then Exit Function
Set oTest = New CRijndael
ByteArray() = StrConv(strMsg, vbFromUnicode)
byteKey() = StrConv(pKey, vbFromUnicode)
CryptText() = oTest.DecryptData(ByteArray(), byteKey())
Set oTest = Nothing
strDecrypt = StrConv(CryptText(), vbUnicode)
End Function
Public Function Hex2Str(ByVal strData As String)
Dim i As Long, CryptString As String, tmpChar As String
On Local Error Resume Next
For i = 1 To Len(strData) Step 2
CryptString = CryptString & Chr$(Val("&H" & Mid$(strData, i, 2)))
Next i
Hex2Str = CryptString
End Function
Public Function Str2Hex(ByVal strData As String)
Dim i As Long, CryptString As String, tmpAppend As String
On Local Error Resume Next
For i = 1 To Len(strData)
tmpAppend = Hex$(Asc(Mid$(strData, i, 1)))
If Len(tmpAppend) = 1 Then tmpAppend = Trim$(Str$(0)) & tmpAppend
CryptString = CryptString & tmpAppend: DoEvents
Next i
Str2Hex = CryptString
End Function
Public Function FileExists(ByVal sFilename As String) As Boolean
Dim Fl As Integer: Fl = Len(Dir$(sFilename))
On Local Error Resume Next
FileExists = IIf(Err Or Fl = 0, False, True)
End Function
Private Function GenRaND() As Byte
Dim RandomSeed As Integer
Randomize
RandomSeed = Int(Rnd * 3) + 1
If RandomSeed = 1 Then
GenRaND = Int(26 * Rnd + 65)
ElseIf RandomSeed = 2 Then
GenRaND = Int(26 * Rnd + 97)
Else ' RandomSeed = 3 Then
GenRaND = Int(10 * Rnd + 48)
End If
End Function
Public Function GenKey(ByVal PassLength As Integer) As String
Dim tempPassword As String, i As Integer
For i = 1 To PassLength
tempPassword = tempPassword & Chr$(GenRaND)
Next i
GenKey = tempPassword
End Function
'Copyright (c)2003 by Dipankar Basu
' http://www.geocities.com/basudip_in/
==================================================
'FORM 1:
VERSION 5.00
Object = "{F9043C88-F6F2-101A-A3C9-08002B2F49FB}#1.2#0"; "COMDLG32.OCX"
Begin VB.Form frmMain
BorderStyle = 1 'Fixed Single
Caption = "CryptText"
ClientHeight = 6630
ClientLeft = 45
ClientTop = 435
ClientWidth = 7590
LinkTopic = "Form1"
LockControls = -1 'True
MaxButton = 0 'False
MinButton = 0 'False
ScaleHeight = 6630
ScaleWidth = 7590
StartUpPosition = 3 'Windows Default
Begin VB.CommandButton cmdChPass
Caption = "Change &Password"
Height = 495
Left = 360
TabIndex = 9
ToolTipText = "change password for Private Key"
Top = 6000
Width = 1335
End
Begin VB.CommandButton cmdGenKey
Caption = "&Generate Key"
Height = 495
Left = 4500
TabIndex = 8
ToolTipText = "Create Private Key"
Top = 6000
Width = 1335
End
Begin VB.CommandButton cmdDwK
Caption = "De&crypt with Key"
Height = 495
Left = 3120
TabIndex = 7
ToolTipText = "decrypt using private key"
Top = 6000
Width = 1335
End
Begin VB.CommandButton cmdEwK
Caption = "E&ncrypt with Key"
Height = 495
Left = 1740
TabIndex = 6
ToolTipText = "encrypt using private key"
Top = 6000
Width = 1335
End
Begin MSComDlg.CommonDialog CommonDialog1
Left = 7560
Top = 2760
_ExtentX = 847
_ExtentY = 847
_Version = 393216
End
Begin VB.CommandButton cmdOpen
Caption = "&Open"
Height = 495
Left = 4500
TabIndex = 5
ToolTipText = "open encrypted file"
Top = 5400
Width = 1335
End
Begin VB.CommandButton cmdSave
Caption = "Sa&ve"
Height = 495
Left = 3120
TabIndex = 4
ToolTipText = "save to a file"
Top = 5400
Width = 1335
End
Begin VB.CommandButton cmdExit
Cancel = -1 'True
Caption = "Clo&se"
Height = 1095
Left = 5880
TabIndex = 3
ToolTipText = "Exit"
Top = 5400
Width = 1335
End
Begin VB.CommandButton cmdDecrypt
Caption = "&Decrypt"
Height = 495
Left = 1740
TabIndex = 2
ToolTipText = "decrypt text"
Top = 5400
Width = 1335
End
Begin VB.CommandButton cmdEncrypt
Caption = "&Encrypt"
Height = 495
Left = 360
TabIndex = 1
ToolTipText = "encrypt text"
Top = 5400
Width = 1335
End
Begin VB.TextBox Text1
Height = 4935
Left = 240
MultiLine = -1 'True
ScrollBars = 3 'Both
TabIndex = 0
Top = 240
Width = 7095
End
End
Attribute VB_Name = "frmMain"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit ' CryptTextAES by Dipankar Basu
Private Sub cmdChPass_Click()
Dim myPassKey As String, currPass As String
currPass = InputBox("Password for your key", "Input old password")
If StrPtr(currPass) = 0 Then Exit Sub
myPassKey = GetMyPassKey(currPass)
If Len(myPassKey) = 25 Then ' this is the length of PassPhrase, see GenKey(N)
currPass = InputBox("Password for your key", "Input new password")
If currPass = vbNullString Then Exit Sub
myPassKey = Str2Hex(strEncrypt(myPassKey, currPass))
SaveSetting "BasuDip Applications", "CryptTextAES", "PassPhraseKey", myPassKey
myPassKey = Str2Hex(strEncrypt(currPass, StrReverse(currPass)))
SaveSetting "BasuDip Applications", "CryptTextAES", "keyPassword", myPassKey
MsgBox "Your password is successfully changed", , "Password Changed"
Else
MsgBox "The Password for your Key is Incorrect", , "Try again"
End If
End Sub
Private Sub cmdDecrypt_Click()
Dim sTemp As String, sPassword As String
sTemp = Trim$(Text1.Text)
sPassword = InputBox("Input the password", "Decrypt with key", "Password Passphrase")
If StrPtr(sPassword) = 0 Then Exit Sub
sTemp = Hex2Str(sTemp)
Text1.Text = strDecrypt(sTemp, sPassword)
End Sub
Private Sub cmdDwK_Click()
Dim sTemp As String, sPassword As String
sTemp = Trim$(Text1.Text)
sPassword = InputBox("PassPhrase Key Password", "Decrypt")
If sPassword = vbNullString Then Exit Sub
sPassword = GetMyPassKey(sPassword)
If sPassword = vbNullString Then Exit Sub
sTemp = Hex2Str(sTemp)
Text1.Text = strDecrypt(sTemp, sPassword)
End Sub
Private Sub cmdEncrypt_Click()
Dim sTemp As String, sPassword As String
sTemp = Text1.Text
sPassword = InputBox("Input a password", "Encrypt with key", "Password Passphrase")
If StrPtr(sPassword) = 0 Then Exit Sub
sTemp = strEncrypt(sTemp, sPassword)
Text1.Text = Str2Hex(sTemp)
End Sub
Private Sub cmdEwK_Click()
Dim sTemp As String, sPassword As String
sTemp = Text1.Text
sPassword = InputBox("PassPhrase Key Password", "Encrypt")
If sPassword = vbNullString Then Exit Sub
sPassword = GetMyPassKey(sPassword)
If sPassword = vbNullString Then Exit Sub
sTemp = strEncrypt(sTemp, sPassword)
Text1.Text = Str2Hex(sTemp)
End Sub
Private Sub cmdExit_Click()
Unload Me: End
End Sub
Private Sub cmdGenKey_Click()
Dim passPhrase As String, myKey As String, var As String, answer As Integer
var = GetSetting("BasuDip Applications", "CryptTextAES", "PassPhraseKey")
If var = vbNullString Then
passPhrase = InputBox("Please provide a password to protect your key", "Create PassPhrase Private Key")
If StrPtr(passPhrase) = 0 Or passPhrase = vbNullString Then Exit Sub
myKey = Str2Hex(strEncrypt(GenKey(25), passPhrase))
SaveSetting "BasuDip Applications", "CryptTextAES", "PassPhraseKey", myKey
myKey = Str2Hex(strEncrypt(passPhrase, StrReverse(passPhrase)))
SaveSetting "BasuDip Applications", "CryptTextAES", "keyPassword", myKey
MsgBox "Password Key is Created, Please remember your password", vbInformation, "Create PassPhrase Key"
Else
answer = MsgBox("You are about to create a new key, any data that was encrypted with " & "your previous key becomes unrecoverable. You'll not be able to decrypt " & "any data encrypted with your old key." & vbNewLine & "Click on Change " & "Password to change the password for the existing key." & vbNewLine & "It is recommended to keep a backup of your old key, before creating a new key." & vbNewLine & "Do you wish to continue in creating a new PassPhrase key ?", vbYesNo + vbDefaultButton2 + vbCritical, "WARNING : Create a New Key")
If answer = vbYes Then
DeleteSetting "BasuDip Applications", "CryptTextAES", "PassPhraseKey"
DeleteSetting "BasuDip Applications", "CryptTextAES", "keyPassword"
Call cmdGenKey_Click
End If
End If
End Sub
Private Sub cmdOpen_Click()
Dim sFilename As String
On Error GoTo eh:
With CommonDialog1
.CancelError = True
.DialogTitle = "Open Encrypted File"
.Filter = "Text Files(*.txt)|*.txt|Rich Text Files(*.rtf)|*.rtf|All Files(*.*)|*.*|"
.InitDir = App.Path
.Flags = cdlOFNFileMustExist Or cdlOFNHideReadOnly
.ShowOpen
sFilename = .FileName
End With
Open sFilename For Input As #1
Text1.Text = StrConv(InputB$(LOF(1), 1), vbUnicode)
Close #1
If Right$(Text1.Text, 2) = vbNewLine Then Text1.Text = Left$(Text1.Text, Len(Text1.Text) - 2)
Exit Sub
eh:
If Err.Number = 2755 Then Exit Sub ' CancelButton on OpenFile
End Sub
Private Sub cmdSave_Click()
Dim sFilePath As String, Fn As Integer
sFilePath = IIf(Right$(App.Path, 1) = "\", App.Path, App.Path & "\")
fnExists:
Fn = Fn + 1
If FileExists(sFilePath & "crypt" & Fn & ".txt") Then GoTo fnExists
Open sFilePath & "crypt" & Fn & ".txt" For Output As #1
Print #1, Text1.Text: Close #1
MsgBox "File is saved to ..." & vbNewLine & sFilePath & "Crypt" & Fn & ".txt", vbInformation, "Text Encryption"
End Sub
Private Function GetMyPassKey(ByVal myPassword As String) As String
Dim regData As String, myKey As String
If myPassword = vbNullString Then Exit Function
myKey = Str2Hex(strEncrypt(myPassword, StrReverse(myPassword)))
regData = GetSetting("BasuDip Applications", "CryptTextAES", "keyPassword")
If myKey = regData Then
regData = GetSetting("BasuDip Applications", "CryptTextAES", "PassPhraseKey")
GetMyPassKey = strDecrypt(Hex2Str(regData), myPassword)
Else
GetMyPassKey = vbNullString
End If
End Function
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "CRijndael"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
' Credits : Phil Fresle
Option Explicit
Private m_lOnBits(30) As Long
Private m_l2Power(30) As Long
Private m_bytOnBits(7) As Byte
Private m_byt2Power(7) As Byte
Private m_InCo(3) As Byte
Private m_fbsub(255) As Byte
Private m_rbsub(255) As Byte
Private m_ptab(255) As Byte
Private m_ltab(255) As Byte
Private m_ftable(255) As Long
Private m_rtable(255) As Long
Private m_rco(29) As Long
Private m_Nk As Long
Private m_Nb As Long
Private m_Nr As Long
Private m_fi(23) As Byte
Private m_ri(23) As Byte
Private m_fkey(119) As Long
Private m_rkey(119) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal Destination As Any, ByVal Source As Any, ByVal Length As Long)
Private Sub Class_Initialize()
m_InCo(0) = &HB: m_InCo(1) = &HD
m_InCo(2) = &H9: m_InCo(3) = &HE
m_bytOnBits(0) = 1 ' 00000001
m_bytOnBits(1) = 3 ' 00000011
m_bytOnBits(2) = 7 ' 00000111
m_bytOnBits(3) = 15 ' 00001111
m_bytOnBits(4) = 31 ' 00011111
m_bytOnBits(5) = 63 ' 00111111
m_bytOnBits(6) = 127 ' 01111111
m_bytOnBits(7) = 255 ' 11111111
m_byt2Power(0) = 1 ' 00000001
m_byt2Power(1) = 2 ' 00000010
m_byt2Power(2) = 4 ' 00000100
m_byt2Power(3) = 8 ' 00001000
m_byt2Power(4) = 16 ' 00010000
m_byt2Power(5) = 32 ' 00100000
m_byt2Power(6) = 64 ' 01000000
m_byt2Power(7) = 128 ' 10000000
m_lOnBits(0) = 1 ' 00000000000000000000000000000001
m_lOnBits(1) = 3 ' 00000000000000000000000000000011
m_lOnBits(2) = 7 ' 00000000000000000000000000000111
m_lOnBits(3) = 15 ' 00000000000000000000000000001111
m_lOnBits(4) = 31 ' 00000000000000000000000000011111
m_lOnBits(5) = 63 ' 00000000000000000000000000111111
m_lOnBits(6) = 127 ' 00000000000000000000000001111111
m_lOnBits(7) = 255 ' 00000000000000000000000011111111
m_lOnBits(8) = 511 ' 00000000000000000000000111111111
m_lOnBits(9) = 1023 ' 00000000000000000000001111111111
m_lOnBits(10) = 2047 ' 00000000000000000000011111111111
m_lOnBits(11) = 4095 ' 00000000000000000000111111111111
m_lOnBits(12) = 8191 ' 00000000000000000001111111111111
m_lOnBits(13) = 16383 ' 00000000000000000011111111111111
m_lOnBits(14) = 32767 ' 00000000000000000111111111111111
m_lOnBits(15) = 65535 ' 00000000000000001111111111111111
m_lOnBits(16) = 131071 ' 00000000000000011111111111111111
m_lOnBits(17) = 262143 ' 00000000000000111111111111111111
m_lOnBits(18) = 524287 ' 00000000000001111111111111111111
m_lOnBits(19) = 1048575 ' 00000000000011111111111111111111
m_lOnBits(20) = 2097151 ' 00000000000111111111111111111111
m_lOnBits(21) = 4194303 ' 00000000001111111111111111111111
m_lOnBits(22) = 8388607 ' 00000000011111111111111111111111
m_lOnBits(23) = 16777215 ' 00000000111111111111111111111111
m_lOnBits(24) = 33554431 ' 00000001111111111111111111111111
m_lOnBits(25) = 67108863 ' 00000011111111111111111111111111
m_lOnBits(26) = 134217727 ' 00000111111111111111111111111111
m_lOnBits(27) = 268435455 ' 00001111111111111111111111111111
m_lOnBits(28) = 536870911 ' 00011111111111111111111111111111
m_lOnBits(29) = 1073741823 ' 00111111111111111111111111111111
m_lOnBits(30) = 2147483647 ' 01111111111111111111111111111111
m_l2Power(0) = 1 ' 00000000000000000000000000000001
m_l2Power(1) = 2 ' 00000000000000000000000000000010
m_l2Power(2) = 4 ' 00000000000000000000000000000100
m_l2Power(3) = 8 ' 00000000000000000000000000001000
m_l2Power(4) = 16 ' 00000000000000000000000000010000
m_l2Power(5) = 32 ' 00000000000000000000000000100000
m_l2Power(6) = 64 ' 00000000000000000000000001000000
m_l2Power(7) = 128 ' 00000000000000000000000010000000
m_l2Power(8) = 256 ' 00000000000000000000000100000000
m_l2Power(9) = 512 ' 00000000000000000000001000000000
m_l2Power(10) = 1024 ' 00000000000000000000010000000000
m_l2Power(11) = 2048 ' 00000000000000000000100000000000
m_l2Power(12) = 4096 ' 00000000000000000001000000000000
m_l2Power(13) = 8192 ' 00000000000000000010000000000000
m_l2Power(14) = 16384 ' 00000000000000000100000000000000
m_l2Power(15) = 32768 ' 00000000000000001000000000000000
m_l2Power(16) = 65536 ' 00000000000000010000000000000000
m_l2Power(17) = 131072 ' 00000000000000100000000000000000
m_l2Power(18) = 262144 ' 00000000000001000000000000000000
m_l2Power(19) = 524288 ' 00000000000010000000000000000000
m_l2Power(20) = 1048576 ' 00000000000100000000000000000000
m_l2Power(21) = 2097152 ' 00000000001000000000000000000000
m_l2Power(22) = 4194304 ' 00000000010000000000000000000000
m_l2Power(23) = 8388608 ' 00000000100000000000000000000000
m_l2Power(24) = 16777216 ' 00000001000000000000000000000000
m_l2Power(25) = 33554432 ' 00000010000000000000000000000000
m_l2Power(26) = 67108864 ' 00000100000000000000000000000000
m_l2Power(27) = 134217728 ' 00001000000000000000000000000000
m_l2Power(28) = 268435456 ' 00010000000000000000000000000000
m_l2Power(29) = 536870912 ' 00100000000000000000000000000000
m_l2Power(30) = 1073741824 ' 01000000000000000000000000000000
End Sub
Private Function LShift(ByVal lValue As Long, ByVal iShiftBits As Integer) As Long
If iShiftBits = 0 Then
LShift = lValue: Exit Function
ElseIf iShiftBits = 31 Then
LShift = IIf(lValue And 1, &H80000000, 0)
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(ByVal lValue As Long, ByVal iShiftBits As Integer) As Long
If iShiftBits = 0 Then
RShift = lValue: Exit Function
ElseIf iShiftBits = 31 Then
RShift = IIf(lValue And &H80000000, 1, 0)
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 Function
Private Function LShiftByte(ByVal bytValue As Byte, ByVal bytShiftBits As Byte) As Byte
If bytShiftBits = 0 Then
LShiftByte = bytValue: Exit Function
ElseIf bytShiftBits = 7 Then
LShiftByte = IIf(bytValue And 1, &H80, 0)
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(ByVal bytValue As Byte, ByVal bytShiftBits As Byte) As Byte
If bytShiftBits = 0 Then
RShiftByte = bytValue: Exit Function
ElseIf bytShiftBits = 7 Then
RShiftByte = IIf(bytValue And &H80, 1, 0)
Exit Function
ElseIf bytShiftBits < 0 Or bytShiftBits > 7 Then
Err.Raise 6
End If
RShiftByte = bytValue \ m_byt2Power(bytShiftBits)
End Function
Private Function RotateLeft(ByVal lValue As Long, ByVal iShiftBits As Integer) As Long
RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
End Function
Private Function RotateLeftByte(ByVal bytValue As Byte, ByVal bytShiftBits As Byte) As Byte
RotateLeftByte = LShiftByte(bytValue, bytShiftBits) Or RShiftByte(bytValue, (8 - bytShiftBits))
End Function
Private Function Pack(b() As Byte) As Long
Dim lCount As Long, lTemp As Long
For lCount = 0 To 3
lTemp = b(lCount): Pack = Pack Or LShift(lTemp, (lCount * 8))
Next lCount
End Function
Private Function PackFrom(b() As Byte, ByVal k As Long) As Long
Dim lCount As Long, lTemp As Long
For lCount = 0 To 3
lTemp = b(lCount + k): PackFrom = PackFrom Or LShift(lTemp, (lCount * 8))
Next lCount
End Function
Private Sub Unpack(ByVal a As Long, b() As Byte)
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(ByVal a As Long, b() As Byte, ByVal k As Long)
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(ByVal a As Byte) As Byte
Dim b As Byte: b = IIf(a And &H80, &H1B, 0)
a = LShiftByte(a, 1): a = a Xor b: Xtime = a
End Function
Private Function Bmul(ByVal x As Byte, y As Byte) As Byte
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(ByVal a As Long) As Long
Dim b(3) As Byte
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(ByVal x As Long, ByVal y As Long) As Long
Dim xb(3) As Byte, yb(3) As Byte
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(ByVal x As Long) As Long
Dim y As Long, m As Long, b(3) As Byte
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(ByVal x As Byte) As Byte
Dim y As Byte
y = m_ptab(255 - m_ltab(x)): x = y
x = RotateLeftByte(x, 1): y = y Xor x
x = RotateLeftByte(x, 1): y = y Xor x
x = RotateLeftByte(x, 1): y = y Xor x
x = RotateLeftByte(x, 1): y = y Xor x
y = y Xor &H63: ByteSub = y
End Function
Private Sub gentables()
Dim i As Long, y As Byte
Dim b(3) As Byte, ib As Byte
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 i
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 i
y = 1
For i = 0 To 29
m_rco(i) = y: y = Xtime(y)
Next i
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 i
End Sub
Private Sub gkey(ByVal nb As Long, ByVal nk As Long, Key() As Byte)
Dim i As Long, j As Long, k As Long, m As Long
Dim N As Long, C1 As Long, C2 As Long, C3 As Long
Dim CipherKey(7) As Long
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 j
N = m_Nb * (m_Nr + 1)
For i = 0 To m_Nk - 1
j = i * 4: CipherKey(i) = PackFrom(Key, j)
Next i
For i = 0 To m_Nk - 1
m_fkey(i) = CipherKey(i)
Next i
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
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 j
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 j
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
Private Sub Encrypt(Buff() As Byte)
Dim i As Long, j As Long, k As Long, m As Long
Dim a(7) As Long, b(7) As Long, x() As Long
Dim y() As Long, t() As Long
For i = 0 To m_Nb - 1
j = i * 4: a(i) = PackFrom(Buff, j): a(i) = a(i) Xor m_fkey(i)
Next i
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 j
t = x: x = y: y = t
Next i
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 j
For i = 0 To m_Nb - 1
j = i * 4: UnpackFrom y(i), Buff, j: x(i) = 0: y(i) = 0
Next i
End Sub
Private Sub Decrypt(Buff() As Byte)
Dim i As Long, j As Long, k As Long, m As Long
Dim a(7) As Long, b(7) As Long, x() As Long
Dim y() As Long, t() As Long
For i = 0 To m_Nb - 1
j = i * 4: a(i) = PackFrom(Buff, j): a(i) = a(i) Xor m_rkey(i)
Next i
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 j
t = x: x = y: y = t
Next i
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 j
For i = 0 To m_Nb - 1
j = i * 4: UnpackFrom y(i), Buff, j: x(i) = 0: y(i) = 0
Next i
End Sub
Private Function IsInitialized(ByRef vArray As Variant) As Boolean
On Local Error Resume Next
IsInitialized = IsNumeric(UBound(vArray))
End Function
Public Function EncryptData(bytMessage() As Byte, bytPassword() As Byte) As Byte()
Dim bytKey(31) As Byte, bytIn() As Byte, bytOut() As Byte
Dim bytTemp(31) As Byte, lCount As Long, lLength As Long
Dim lEncodedLength As Long, bytLen(3) As Byte, lPosition As Long
If Not IsInitialized(bytMessage) Then Exit Function
If Not IsInitialized(bytPassword) Then Exit Function
For lCount = 0 To UBound(bytPassword)
bytKey(lCount) = bytPassword(lCount): If lCount = 31 Then Exit For
Next lCount
gentables
gkey 8, 8, bytKey
lLength = UBound(bytMessage) + 1: lEncodedLength = lLength + 4
If lEncodedLength Mod 32 0 Then lEncodedLength = lEncodedLength + 32 - (lEncodedLength Mod 32)
ReDim bytIn(lEncodedLength - 1): ReDim bytOut(lEncodedLength - 1)
CopyMemory VarPtr(bytIn(0)), VarPtr(lLength), 4
CopyMemory VarPtr(bytIn(4)), VarPtr(bytMessage(0)), lLength
For lCount = 0 To lEncodedLength - 1 Step 32
CopyMemory VarPtr(bytTemp(0)), VarPtr(bytIn(lCount)), 32
Encrypt bytTemp
CopyMemory VarPtr(bytOut(lCount)), VarPtr(bytTemp(0)), 32
Next lCount
EncryptData = bytOut
End Function
Public Function DecryptData(bytIn() As Byte, bytPassword() As Byte) As Byte()
Dim bytMessage() As Byte, bytKey(31) As Byte, bytOut() As Byte
Dim bytTemp(31) As Byte, lCount As Long, lLength As Long
Dim lEncodedLength As Long, bytLen(3) As Byte, lPosition As Long
If Not IsInitialized(bytIn) Then Exit Function
If Not IsInitialized(bytPassword) Then Exit Function
lEncodedLength = UBound(bytIn) + 1
If lEncodedLength Mod 32 0 Then Exit Function
For lCount = 0 To UBound(bytPassword)
bytKey(lCount) = bytPassword(lCount): If lCount = 31 Then Exit For
Next lCount
gentables
gkey 8, 8, bytKey
ReDim bytOut(lEncodedLength - 1)
For lCount = 0 To lEncodedLength - 1 Step 32
CopyMemory VarPtr(bytTemp(0)), VarPtr(bytIn(lCount)), 32
Decrypt bytTemp
CopyMemory VarPtr(bytOut(lCount)), VarPtr(bytTemp(0)), 32
Next lCount
CopyMemory VarPtr(lLength), VarPtr(bytOut(0)), 4
If lLength > lEncodedLength - 4 Then Exit Function
ReDim bytMessage(lLength - 1)
CopyMemory VarPtr(bytMessage(0)), VarPtr(bytOut(4)), lLength
DecryptData = bytMessage
End Function
====================================================================
'MODUL:
Attribute VB_Name = "modCryptText"
Option Explicit
' encrypt text messages using AES_Rijndael Block Cipher
' by Dipankar Basu.
Private oTest As CRijndael
Public Function strEncrypt(ByVal strMsg As String, ByVal pKey As String) As String
Dim ByteArray() As Byte, byteKey() As Byte, CryptText() As Byte
On Local Error Resume Next
' If strMsg = vbNullString Or pKey = vbNullString Then Exit Function
Set oTest = New CRijndael
ByteArray() = StrConv(strMsg, vbFromUnicode)
byteKey() = StrConv(pKey, vbFromUnicode)
CryptText() = oTest.EncryptData(ByteArray(), byteKey())
Set oTest = Nothing
strEncrypt = StrConv(CryptText(), vbUnicode)
End Function
Public Function strDecrypt(ByVal strMsg As String, ByVal pKey As String) As String
Dim ByteArray() As Byte, byteKey() As Byte, CryptText() As Byte
On Local Error Resume Next
' If strMsg = vbNullString Or pKey = vbNullString Then Exit Function
Set oTest = New CRijndael
ByteArray() = StrConv(strMsg, vbFromUnicode)
byteKey() = StrConv(pKey, vbFromUnicode)
CryptText() = oTest.DecryptData(ByteArray(), byteKey())
Set oTest = Nothing
strDecrypt = StrConv(CryptText(), vbUnicode)
End Function
Public Function Hex2Str(ByVal strData As String)
Dim i As Long, CryptString As String, tmpChar As String
On Local Error Resume Next
For i = 1 To Len(strData) Step 2
CryptString = CryptString & Chr$(Val("&H" & Mid$(strData, i, 2)))
Next i
Hex2Str = CryptString
End Function
Public Function Str2Hex(ByVal strData As String)
Dim i As Long, CryptString As String, tmpAppend As String
On Local Error Resume Next
For i = 1 To Len(strData)
tmpAppend = Hex$(Asc(Mid$(strData, i, 1)))
If Len(tmpAppend) = 1 Then tmpAppend = Trim$(Str$(0)) & tmpAppend
CryptString = CryptString & tmpAppend: DoEvents
Next i
Str2Hex = CryptString
End Function
Public Function FileExists(ByVal sFilename As String) As Boolean
Dim Fl As Integer: Fl = Len(Dir$(sFilename))
On Local Error Resume Next
FileExists = IIf(Err Or Fl = 0, False, True)
End Function
Private Function GenRaND() As Byte
Dim RandomSeed As Integer
Randomize
RandomSeed = Int(Rnd * 3) + 1
If RandomSeed = 1 Then
GenRaND = Int(26 * Rnd + 65)
ElseIf RandomSeed = 2 Then
GenRaND = Int(26 * Rnd + 97)
Else ' RandomSeed = 3 Then
GenRaND = Int(10 * Rnd + 48)
End If
End Function
Public Function GenKey(ByVal PassLength As Integer) As String
Dim tempPassword As String, i As Integer
For i = 1 To PassLength
tempPassword = tempPassword & Chr$(GenRaND)
Next i
GenKey = tempPassword
End Function
'Copyright (c)2003 by Dipankar Basu
' http://www.geocities.com/basudip_in/
==================================================
'FORM 1:
VERSION 5.00
Object = "{F9043C88-F6F2-101A-A3C9-08002B2F49FB}#1.2#0"; "COMDLG32.OCX"
Begin VB.Form frmMain
BorderStyle = 1 'Fixed Single
Caption = "CryptText"
ClientHeight = 6630
ClientLeft = 45
ClientTop = 435
ClientWidth = 7590
LinkTopic = "Form1"
LockControls = -1 'True
MaxButton = 0 'False
MinButton = 0 'False
ScaleHeight = 6630
ScaleWidth = 7590
StartUpPosition = 3 'Windows Default
Begin VB.CommandButton cmdChPass
Caption = "Change &Password"
Height = 495
Left = 360
TabIndex = 9
ToolTipText = "change password for Private Key"
Top = 6000
Width = 1335
End
Begin VB.CommandButton cmdGenKey
Caption = "&Generate Key"
Height = 495
Left = 4500
TabIndex = 8
ToolTipText = "Create Private Key"
Top = 6000
Width = 1335
End
Begin VB.CommandButton cmdDwK
Caption = "De&crypt with Key"
Height = 495
Left = 3120
TabIndex = 7
ToolTipText = "decrypt using private key"
Top = 6000
Width = 1335
End
Begin VB.CommandButton cmdEwK
Caption = "E&ncrypt with Key"
Height = 495
Left = 1740
TabIndex = 6
ToolTipText = "encrypt using private key"
Top = 6000
Width = 1335
End
Begin MSComDlg.CommonDialog CommonDialog1
Left = 7560
Top = 2760
_ExtentX = 847
_ExtentY = 847
_Version = 393216
End
Begin VB.CommandButton cmdOpen
Caption = "&Open"
Height = 495
Left = 4500
TabIndex = 5
ToolTipText = "open encrypted file"
Top = 5400
Width = 1335
End
Begin VB.CommandButton cmdSave
Caption = "Sa&ve"
Height = 495
Left = 3120
TabIndex = 4
ToolTipText = "save to a file"
Top = 5400
Width = 1335
End
Begin VB.CommandButton cmdExit
Cancel = -1 'True
Caption = "Clo&se"
Height = 1095
Left = 5880
TabIndex = 3
ToolTipText = "Exit"
Top = 5400
Width = 1335
End
Begin VB.CommandButton cmdDecrypt
Caption = "&Decrypt"
Height = 495
Left = 1740
TabIndex = 2
ToolTipText = "decrypt text"
Top = 5400
Width = 1335
End
Begin VB.CommandButton cmdEncrypt
Caption = "&Encrypt"
Height = 495
Left = 360
TabIndex = 1
ToolTipText = "encrypt text"
Top = 5400
Width = 1335
End
Begin VB.TextBox Text1
Height = 4935
Left = 240
MultiLine = -1 'True
ScrollBars = 3 'Both
TabIndex = 0
Top = 240
Width = 7095
End
End
Attribute VB_Name = "frmMain"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit ' CryptTextAES by Dipankar Basu
Private Sub cmdChPass_Click()
Dim myPassKey As String, currPass As String
currPass = InputBox("Password for your key", "Input old password")
If StrPtr(currPass) = 0 Then Exit Sub
myPassKey = GetMyPassKey(currPass)
If Len(myPassKey) = 25 Then ' this is the length of PassPhrase, see GenKey(N)
currPass = InputBox("Password for your key", "Input new password")
If currPass = vbNullString Then Exit Sub
myPassKey = Str2Hex(strEncrypt(myPassKey, currPass))
SaveSetting "BasuDip Applications", "CryptTextAES", "PassPhraseKey", myPassKey
myPassKey = Str2Hex(strEncrypt(currPass, StrReverse(currPass)))
SaveSetting "BasuDip Applications", "CryptTextAES", "keyPassword", myPassKey
MsgBox "Your password is successfully changed", , "Password Changed"
Else
MsgBox "The Password for your Key is Incorrect", , "Try again"
End If
End Sub
Private Sub cmdDecrypt_Click()
Dim sTemp As String, sPassword As String
sTemp = Trim$(Text1.Text)
sPassword = InputBox("Input the password", "Decrypt with key", "Password Passphrase")
If StrPtr(sPassword) = 0 Then Exit Sub
sTemp = Hex2Str(sTemp)
Text1.Text = strDecrypt(sTemp, sPassword)
End Sub
Private Sub cmdDwK_Click()
Dim sTemp As String, sPassword As String
sTemp = Trim$(Text1.Text)
sPassword = InputBox("PassPhrase Key Password", "Decrypt")
If sPassword = vbNullString Then Exit Sub
sPassword = GetMyPassKey(sPassword)
If sPassword = vbNullString Then Exit Sub
sTemp = Hex2Str(sTemp)
Text1.Text = strDecrypt(sTemp, sPassword)
End Sub
Private Sub cmdEncrypt_Click()
Dim sTemp As String, sPassword As String
sTemp = Text1.Text
sPassword = InputBox("Input a password", "Encrypt with key", "Password Passphrase")
If StrPtr(sPassword) = 0 Then Exit Sub
sTemp = strEncrypt(sTemp, sPassword)
Text1.Text = Str2Hex(sTemp)
End Sub
Private Sub cmdEwK_Click()
Dim sTemp As String, sPassword As String
sTemp = Text1.Text
sPassword = InputBox("PassPhrase Key Password", "Encrypt")
If sPassword = vbNullString Then Exit Sub
sPassword = GetMyPassKey(sPassword)
If sPassword = vbNullString Then Exit Sub
sTemp = strEncrypt(sTemp, sPassword)
Text1.Text = Str2Hex(sTemp)
End Sub
Private Sub cmdExit_Click()
Unload Me: End
End Sub
Private Sub cmdGenKey_Click()
Dim passPhrase As String, myKey As String, var As String, answer As Integer
var = GetSetting("BasuDip Applications", "CryptTextAES", "PassPhraseKey")
If var = vbNullString Then
passPhrase = InputBox("Please provide a password to protect your key", "Create PassPhrase Private Key")
If StrPtr(passPhrase) = 0 Or passPhrase = vbNullString Then Exit Sub
myKey = Str2Hex(strEncrypt(GenKey(25), passPhrase))
SaveSetting "BasuDip Applications", "CryptTextAES", "PassPhraseKey", myKey
myKey = Str2Hex(strEncrypt(passPhrase, StrReverse(passPhrase)))
SaveSetting "BasuDip Applications", "CryptTextAES", "keyPassword", myKey
MsgBox "Password Key is Created, Please remember your password", vbInformation, "Create PassPhrase Key"
Else
answer = MsgBox("You are about to create a new key, any data that was encrypted with " & "your previous key becomes unrecoverable. You'll not be able to decrypt " & "any data encrypted with your old key." & vbNewLine & "Click on Change " & "Password to change the password for the existing key." & vbNewLine & "It is recommended to keep a backup of your old key, before creating a new key." & vbNewLine & "Do you wish to continue in creating a new PassPhrase key ?", vbYesNo + vbDefaultButton2 + vbCritical, "WARNING : Create a New Key")
If answer = vbYes Then
DeleteSetting "BasuDip Applications", "CryptTextAES", "PassPhraseKey"
DeleteSetting "BasuDip Applications", "CryptTextAES", "keyPassword"
Call cmdGenKey_Click
End If
End If
End Sub
Private Sub cmdOpen_Click()
Dim sFilename As String
On Error GoTo eh:
With CommonDialog1
.CancelError = True
.DialogTitle = "Open Encrypted File"
.Filter = "Text Files(*.txt)|*.txt|Rich Text Files(*.rtf)|*.rtf|All Files(*.*)|*.*|"
.InitDir = App.Path
.Flags = cdlOFNFileMustExist Or cdlOFNHideReadOnly
.ShowOpen
sFilename = .FileName
End With
Open sFilename For Input As #1
Text1.Text = StrConv(InputB$(LOF(1), 1), vbUnicode)
Close #1
If Right$(Text1.Text, 2) = vbNewLine Then Text1.Text = Left$(Text1.Text, Len(Text1.Text) - 2)
Exit Sub
eh:
If Err.Number = 2755 Then Exit Sub ' CancelButton on OpenFile
End Sub
Private Sub cmdSave_Click()
Dim sFilePath As String, Fn As Integer
sFilePath = IIf(Right$(App.Path, 1) = "\", App.Path, App.Path & "\")
fnExists:
Fn = Fn + 1
If FileExists(sFilePath & "crypt" & Fn & ".txt") Then GoTo fnExists
Open sFilePath & "crypt" & Fn & ".txt" For Output As #1
Print #1, Text1.Text: Close #1
MsgBox "File is saved to ..." & vbNewLine & sFilePath & "Crypt" & Fn & ".txt", vbInformation, "Text Encryption"
End Sub
Private Function GetMyPassKey(ByVal myPassword As String) As String
Dim regData As String, myKey As String
If myPassword = vbNullString Then Exit Function
myKey = Str2Hex(strEncrypt(myPassword, StrReverse(myPassword)))
regData = GetSetting("BasuDip Applications", "CryptTextAES", "keyPassword")
If myKey = regData Then
regData = GetSetting("BasuDip Applications", "CryptTextAES", "PassPhraseKey")
GetMyPassKey = strDecrypt(Hex2Str(regData), myPassword)
Else
GetMyPassKey = vbNullString
End If
End Function
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