Skip to main content

A free open source data encryption program for steemit users

A free open source data encryption program for steemit users

Hello, everyone this is my first software sharing for Steemit Community. I developed a software (programmed in Visual Basic 8) for encrypting any text data. It’ll play a vital role on Steemit Community, because, on Steemit Platform we need a very long passphrase to be saved. It’s impossible to memorize this passphrase. And, it’s also very dangerous to write down this passphrase in the notepad. There are too many free password keepers & encryption programs, but, maximum are not open-source. My main objective is to provide such type open-source program.
I use AES Rijndael Block Cipher Encryption Algorithm to encrypt text data.
Step by Step Development :
Open a new project in Visual Basic 8. Select “Standard EXE”.
enter image description here
enter image description here
Create two text boxes & two command buttons on the form. Text1 textbox, Text2 textbox, Command1 commandbutton & Command2 commandbutton.
enter image description here
Change the caption of the command buttons from “Command1” to “Encrypt data” & “Command2” to “Decrypt data”.
enter image description here
Add a class module “CRijndael” to the project
enter image description here
Add this following codes to the class module “CRijndael” :
enter image description here
' 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 <= 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 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
Add a module “Module 1” to the project
enter image description here
Add this following codes to the module “Module 1” :
enter image description here
Option Explicit
'   I use AES Rijndael Block Cipher Encryption
Algorithm
Private AES_alog  As CRijndael
Public encryption_key As String
'hexadeimal to String Conversion function Public Function hexa_to_str(ByVal textData As String) Dim i As Long, CryptString As String, tmpChar As String On Local Error Resume Next For i = 1 To Len(textData) Step 2 CryptString = CryptString & Chr$(Val("&H" & Mid$(textData, i, 2))) Next i hexa_to_str = CryptString End Function
'String to hexadecimal Convertion function Public Function str_to_hexa(ByVal textData As String) Dim i As Long, CryptString As String, tmpAppend As String On Local Error Resume Next For i = 1 To Len(textData) tmpAppend = Hex$(Asc(Mid$(textData, i, 1))) If Len(tmpAppend) = 1 Then tmpAppend = Trim$(Str$(0)) & tmpAppend CryptString = CryptString & tmpAppend: DoEvents Next i str_to_hexa = CryptString End Function
'Encryption function with AES encryption algorithm Public Function Encrypt_it(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 Set AES_alog = New CRijndael ByteArray() = StrConv(strMsg, vbFromUnicode) byteKey() = StrConv(pKey, vbFromUnicode) CryptText() = AES_alog.EncryptData(ByteArray(), byteKey()) Set AES_alog = Nothing Encrypt_it = StrConv(CryptText(), vbUnicode) End Function
'Decryption function with AES encryption algorithm Public Function Decrypt_it(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 Set AES_alog = New CRijndael ByteArray() = StrConv(strMsg, vbFromUnicode) byteKey() = StrConv(pKey, vbFromUnicode) CryptText() = AES_alog.DecryptData(ByteArray(), byteKey()) Set AES_alog = Nothing Decrypt_it = StrConv(CryptText(), vbUnicode) End Function
Input this following code to Form1 :
enter image description here
Private Sub Form_Load()
'don't reveal this key
encryption_key =
"37979fa464f002d8a9bcf743f786863bc090b16864f93a5d1f4b83f9d05" ' you may set your own key
End Sub
'Encrypt data
Private Sub Command1_Click()
Dim sData As String
sData = Text1.Text
sData = Encrypt_it(sData, encryption_key)
Text2.Text = str_to_hexa(sData)
End Sub
Decrypt Data
Private Sub Command2_Click()
Dim sData As String
sData = Trim$(Text1.Text)
sData = hexa_to_str(sData)
Text2.Text = Decrypt_it(sData, encryption_key)
End Sub
Make the exe file :
enter image description here
Completed ! Now run the exe file :
In this tutorial I’ll encrypt my steemit posting public key
STM6ipnKtY59NESmg7Km5HjUuYzzRHKd8VYdLNXMyHAGUX7MnDWMh enter image description here
After encryption I got this encrypted data
873B6CC83B0CBDC2CAC0FA1D94D4A7B9C092A6734EEC85480466DFBADCE7B8F179202D1E25AEA7FE354631E0193860ED2FB4226B162504D258A5E80FE0F5CF9D
You can save this data anywhere without any risk.
Now, I’ll decrypt it again –
enter image description here
Look that I successfully decrypt it by getting the text again
STM6ipnKtY59NESmg7Km5HjUuYzzRHKd8VYdLNXMyHAGUX7MnDWMh
WARNING !!! I use an encryption key in the code.
‘don’t reveal this key encryption_key = “37979fa464f002d8a9bcf743f786863bc090b16864f93a5d1f4b83f9d05” ’ you may set your own key
This code must be different when you make your own software. And you don’t reveal this key. If anyone gets this encryption key then your encrypted data shall be at risk.

Download the source code project


Tags : Open Source Project, Programming, Security, Software, Steemit, Visual Basic, 

This Post Was Published On My Steemit Blog. Please, navigate to steemit and cast a free upvote to help me if you like my post. First Time heard about Steemit ? Click Here To Know Everything About Steemit 



$3 Donation [Fixed]

$Any Amount





Comments

Popular Posts (Last 7 Days)

One Black & White Photograph Daily for 30 days - Day #25

green yard - behind of my village home Camera : Xiaomi Model : 2014818 Location : Bongaon, West Bengal, India Snap Taken : 14 March 2016 Tags : Black & White Photography, Flowers & Plants photography, Landscape photography, Nature, Photography,  This Post Was Published On My Steemit Blog . Please, navigate to steemit and cast a free upvote to help me if you like my post. First Time heard about Steemit ? Click Here To Know Everything About Steemit  $3 Donation [Fixed] Donate $Any Amount

What I Learnt Today : 10 Unknown Amazing Facts About Animals - Part CXXXIII

  image credit (1) Japanese Macaques make snowballs for fun. (2) The chevrotain is an animal that looks like a tiny deer with fangs. (3) Turritopsis nutricula Immortal jellyfish is the only species known to live forever. (4) One million stray dogs and 500,000 stray cats live in New York City metropolitan area. Turritopsis nutricula Immortal jellyfish   image credit (5) Nine-banded armadillos always give birth to identical quadruplets. (6) The flying frog uses flaps of skin between its toes to glide. (7) It takes a sloth two weeks to digest its food.   Nine-banded armadillo   flying frogs   image credit (8) A narwhal tusk is actually an exaggerated front left tooth, and unlike most teeth, it's soft and sensitive on the outside with a tough interior. (9) Humpback whales create the loudest sound of any living creature. (10) The slowest mammal on earth is the tree sloth. It only moves at a speed of 6 feet (1.83 meters) per minute. sloth narwhal tusk   i

Diwali - Festival of Lights & Kali Puja - Worship of Power against evils [Series Photography] #08

Another great festival Diwali & Kali Puja Diwali & Kali Puja is our another awesome celebration. Diwali is the festival of lights and Kali Puja is the worship of goddess Maa Kali. We celebrate this two festivals in the same night. We, Bengalee also call Diwali as Deepawali. Diwali is celebrated every month of October/November (Autumn) in India, Nepal & Bangladesh. In this day every Hindu decorates their home & temples with lights. Kali Puja is also known as Shyama Puja. In the same night of Diwali we celebrate it. The goddess Kali is the symbol of power against evil. In nowadays our city Kolkata wears glamorous attire & illumination.  I framed some moments on my camera— (all photographs are original & taken by myself) EPISODE #08 See also :  Episode #01 ,  Episode #02 ,  Episode #03 ,  Episode #04 ,  Episode #05 ,  Episode #06 ,  Episode #07 Estimated Cost : 4.5 Million Rupees well decorated entrance arc — Some artistic designs & sculp

The Real Face Of India - Episode 133

The Real Face Of India - Episode#133 I believe that India is the most beautiful country in the world. In this series I show the real face of beautiful India. Half Dozen Photos of Natural Beauties Snap taken : 21 Mar 2018   Camera : SAMSUNG, Model : SM-A310N0 Other Episodes :  Episode#01 ,  Episode#02 ,  Episode#03 ,  Episode#04 ,  Episode#05 ,  Episode#06 ,  Episode#07 ,  Episode#08 ,  Episode#09 ,  Episode#10 ,  Episode#11 ,  Episode#12 ,  Episode#13 ,  Episode#14 ,  Episode#15 ,  Episode#16 ,  Episode#17 ,  Episode#18 ,  Episode#19 ,  Episode#20 ,  Episode#21 ,  Episode#22 ,  Episode#23 ,  Episode#24 ,  Episode#25 ,  Episode#26 ,  Episode#27 ,  Episode#28 ,  Episode#29 ,  Episode#30 ,  Episode#31 ,  Episode#32 ,  Episode#33 ,  Episode#34 ,  Episode#35 ,  Episode#36 ,  Episode#37 ,  Episode#38 ,  Episode#39 ,  Episode#40 ,  Episode#41 ,  Episode#42 ,  Episode#43 ,  Episode#44 ,  Episode#45 ,  Episode#46 ,  Episode#47 ,  Episode#48 ,  Episode#49 ,  Episode#50 , 

Before A Heavy Rainfall

I clicked at the exact time ; after about 5 minutes rain started Location : Dakshineswar, Kolkata Snap taken : 02 August 2016 Camera : Xiaomi ; model - 2014818 Tags : Photography, Nature, Landscape photography, Flowers & Plants photography, Sky,  This Post Was Published On My Steemit Blog . Please, navigate to steemit and cast a free upvote to help me if you like my post. First Time heard about Steemit ? Click Here To Know Everything About Steemit  $3 Donation [Fixed] Donate $Any Amount

Top 10 famous Abstract Art of all the time

Top 10 famous Abstract Art of all the time I love abstract arts. I believe that abstract art is not what you see , it’s what you think. Abstract art is the freedom of using colors, is the freedom of representing your thoughts in colors. Today, here I share top 10 famous abstract arts of all the time. Hope you’ll enjoy them. Number 10 : The Son Of Man by Rene Magritte image source & credit :  LINK Artist: René Magritte Media: Oil paint Created: 1964 Period: Surrealism Subject: René Magritte Number 09 : Garçon à la pipe by Pablo Picasso image source & credit :  LINK Artist: Pablo Picasso Dimensions: 1 m x 81 cm Created: 1905 Media: Oil paint Period: Picasso’s Rose Period Support: Canvas Number 08 : The Night Watch by Rembrandt image source & credit :  LINK Artist: Rembrandt Dimensions: 3.63 m x 4.37 m Created: 1642 Locations: Amsterdam Museum, Rijksmuseum Periods: Baroque, Dutch Golden Age Genres: Portrait, History pain

I love GREEN [My Original Work] - VIII

I love green, I love tree, I love nature --- [Series VIII] I took this photo at   Alipore Zoological Gardens  . It's India's oldest zoological park and also a good tourist spot in Kolkata, India.    Tags : Nature, Photography, Landscape photography, Flowers & Plants photography,  This Post Was Published On My Steemit Blog . Please, navigate to steemit and cast a free upvote to help me if you like my post. First Time heard about Steemit ? Click Here To Know Everything About Steemit  $3 Donation [Fixed] Donate $Any Amount

What I Learnt Today : Most Malware Infected Top 20 Cities in the USA

What I Learnt Today : Most Malware Infected Top 20 Cities in the USA image credit An anti-virus development firm  Enigma Software Inc  has recently published a list of most malware affected cities in the United States of America. Be careful while travelling these cities and using the public wifi, cyber cafe, public computer or using your flash drives or memory chips on such computer. There is a higher possibility to be get infected in these following cities, so, be extra careful - Tampa  : The infection rate is 506% higher than the national average. Saint Louis  : The infection rate is 392% higher than the national average. Orlando  : The infection rate is 375% higher than the national average. Denver  : The infection rate is 333% higher than the national average. Atlanta  : The infection rate is 327% higher than the national average. Newark  : The infection rate is 241% higher than the national average. Salt Lake City  : The infection rate is 223% higher than

alone - [An Original Abstract Art] - #14 & An Original Micropoetry

Here I share my latest work on Abstract Art “alone” – [ Series #14] & an original micropoetry alone Cowboy returns home with his cattle. Birds are coming back ,ending food battle I still sitting below the banyan tree , penniless A gentle breeze brings a message ,live live. Tags : Abstract, Art, Drawing, Painting, Poems,  This Post Was Published On My Steemit Blog . Please, navigate to steemit and cast a free upvote to help me if you like my post. First Time heard about Steemit ? Click Here To Know Everything About Steemit  $3 Donation [Fixed] Donate $Any Amount

Two Photographs of very rare creature Gharial

Two Photographs of very rare creature Gharial Tags : Animals, Animals photography, Gharial, Photography, Zoo,  This Post Was Published On My Steemit Blog . Please, navigate to steemit and cast a free upvote to help me if you like my post. First Time heard about Steemit ? Click Here To Know Everything About Steemit  $3 Donation [Fixed] Donate $Any Amount
Back to Top