Option Explicit
'添加[类模块],命名为[clsDES.cls]
'======DES加密======
'加密模式：ECB
'填充：zeropadding
'输出字符集：base64
'======用法======
'加密
' DES.Key = ""
' DES.EncryptString(date, Key)
'解密
'DES.DecryptString(date, Key)
'======
'For progress notifications
Event Progress(Percent As Long)
'Key-dependant
Private m_Key(0 To 47, 1 To 16) As Byte
'Buffered key value
Private m_KeyValue As String
'Values given in the DES standard
Private m_E(0 To 63) As Byte
Private m_P(0 To 31) As Byte
Private m_IP(0 To 63) As Byte
Private m_PC1(0 To 55) As Byte
Private m_PC2(0 To 47) As Byte
Private m_IPInv(0 To 63) As Byte
Private m_EmptyArray(0 To 63) As Byte
Private m_LeftShifts(1 To 16) As Byte
Private m_sBox(0 To 7, 0 To 1, 0 To 1, 0 To 1, 0 To 1, 0 To 1, 0 To 1) As Long
Private Declare Sub CopyMem Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Private Static Sub Byte2Bin(ByteArray() As Byte, ByteLen As Long, BinaryArray() As Byte)
Dim A As Long
Dim ByteValue As Byte
Dim BinLength As Long
'Clear the destination array, faster than
'setting the data to zero in the loop below
Call CopyMem(BinaryArray(0), m_EmptyArray(0), ByteLen * 8)
'Add binary 1's where needed
BinLength = 0
For A = 0 To (ByteLen - 1)
ByteValue = ByteArray(A)
If (ByteValue And 128) Then BinaryArray(BinLength) = 1
If (ByteValue And 64) Then BinaryArray(BinLength + 1) = 1
If (ByteValue And 32) Then BinaryArray(BinLength + 2) = 1
If (ByteValue And 16) Then BinaryArray(BinLength + 3) = 1
If (ByteValue And 8) Then BinaryArray(BinLength + 4) = 1
If (ByteValue And 4) Then BinaryArray(BinLength + 5) = 1
If (ByteValue And 2) Then BinaryArray(BinLength + 6) = 1
If (ByteValue And 1) Then BinaryArray(BinLength + 7) = 1
BinLength = BinLength + 8
Next
End Sub
Private Static Sub Bin2Byte(BinaryArray() As Byte, ByteLen As Long, ByteArray() As Byte)
Dim A As Long
Dim ByteValue As Byte
Dim BinLength As Long
'Calculate byte values
BinLength = 0
For A = 0 To (ByteLen - 1)
ByteValue = 0
If (BinaryArray(BinLength) = 1) Then ByteValue = ByteValue + 128
If (BinaryArray(BinLength + 1) = 1) Then ByteValue = ByteValue + 64
If (BinaryArray(BinLength + 2) = 1) Then ByteValue = ByteValue + 32
If (BinaryArray(BinLength + 3) = 1) Then ByteValue = ByteValue + 16
If (BinaryArray(BinLength + 4) = 1) Then ByteValue = ByteValue + 8
If (BinaryArray(BinLength + 5) = 1) Then ByteValue = ByteValue + 4
If (BinaryArray(BinLength + 6) = 1) Then ByteValue = ByteValue + 2
If (BinaryArray(BinLength + 7) = 1) Then ByteValue = ByteValue + 1
ByteArray(A) = ByteValue
BinLength = BinLength + 8
Next
End Sub
Private Static Sub EncryptBlock(BlockData() As Byte)
Dim A As Long
Dim i As Long
Dim L(0 To 31) As Byte
Dim R(0 To 31) As Byte
Dim RL(0 To 63) As Byte
Dim sBox(0 To 31) As Byte
Dim LiRi(0 To 31) As Byte
Dim ERxorK(0 To 47) As Byte
Dim BinBlock(0 To 63) As Byte
'Convert the block into a binary array
'(I do believe this is the best solution
'in VB for the DES algorithm, but it is
'still slow as xxxx)
Call Byte2Bin(BlockData(), 8, BinBlock())
'Apply the IP permutation and split the
'block into two halves, L[] and R[]
For A = 0 To 31
L(A) = BinBlock(m_IP(A))
R(A) = BinBlock(m_IP(A + 32))
Next
'Apply the 16 subkeys on the block
For i = 1 To 16
'E(R[i]) xor K[i]
ERxorK(0) = R(31) Xor m_Key(0, i)
ERxorK(1) = R(0) Xor m_Key(1, i)
ERxorK(2) = R(1) Xor m_Key(2, i)
ERxorK(3) = R(2) Xor m_Key(3, i)
ERxorK(4) = R(3) Xor m_Key(4, i)
ERxorK(5) = R(4) Xor m_Key(5, i)
ERxorK(6) = R(3) Xor m_Key(6, i)
ERxorK(7) = R(4) Xor m_Key(7, i)
ERxorK(8) = R(5) Xor m_Key(8, i)
ERxorK(9) = R(6) Xor m_Key(9, i)
ERxorK(10) = R(7) Xor m_Key(10, i)
ERxorK(11) = R(8) Xor m_Key(11, i)
ERxorK(12) = R(7) Xor m_Key(12, i)
ERxorK(13) = R(8) Xor m_Key(13, i)
ERxorK(14) = R(9) Xor m_Key(14, i)
ERxorK(15) = R(10) Xor m_Key(15, i)
ERxorK(16) = R(11) Xor m_Key(16, i)
ERxorK(17) = R(12) Xor m_Key(17, i)
ERxorK(18) = R(11) Xor m_Key(18, i)
ERxorK(19) = R(12) Xor m_Key(19, i)
ERxorK(20) = R(13) Xor m_Key(20, i)
ERxorK(21) = R(14) Xor m_Key(21, i)
ERxorK(22) = R(15) Xor m_Key(22, i)
ERxorK(23) = R(16) Xor m_Key(23, i)
ERxorK(24) = R(15) Xor m_Key(24, i)
ERxorK(25) = R(16) Xor m_Key(25, i)
ERxorK(26) = R(17) Xor m_Key(26, i)
ERxorK(27) = R(18) Xor m_Key(27, i)
ERxorK(28) = R(19) Xor m_Key(28, i)
ERxorK(29) = R(20) Xor m_Key(29, i)
ERxorK(30) = R(19) Xor m_Key(30, i)
ERxorK(31) = R(20) Xor m_Key(31, i)
ERxorK(32) = R(21) Xor m_Key(32, i)
ERxorK(33) = R(22) Xor m_Key(33, i)
ERxorK(34) = R(23) Xor m_Key(34, i)
ERxorK(35) = R(24) Xor m_Key(35, i)
ERxorK(36) = R(23) Xor m_Key(36, i)
ERxorK(37) = R(24) Xor m_Key(37, i)
ERxorK(38) = R(25) Xor m_Key(38, i)
ERxorK(39) = R(26) Xor m_Key(39, i)
ERxorK(40) = R(27) Xor m_Key(40, i)
ERxorK(41) = R(28) Xor m_Key(41, i)
ERxorK(42) = R(27) Xor m_Key(42, i)
ERxorK(43) = R(28) Xor m_Key(43, i)
ERxorK(44) = R(29) Xor m_Key(44, i)
ERxorK(45) = R(30) Xor m_Key(45, i)
ERxorK(46) = R(31) Xor m_Key(46, i)
ERxorK(47) = R(0) Xor m_Key(47, i)
'Apply the s-boxes
Call CopyMem(sBox(0), m_sBox(0, ERxorK(0), ERxorK(1), ERxorK(2), ERxorK(3), ERxorK(4), ERxorK(5)), 4)
Call CopyMem(sBox(4), m_sBox(1, ERxorK(6), ERxorK(7), ERxorK(8), ERxorK(9), ERxorK(10), ERxorK(11)), 4)
Call CopyMem(sBox(8), m_sBox(2, ERxorK(12), ERxorK(13), ERxorK(14), ERxorK(15), ERxorK(16), ERxorK(17)), 4)
Call CopyMem(sBox(12), m_sBox(3, ERxorK(18), ERxorK(19), ERxorK(20), ERxorK(21), ERxorK(22), ERxorK(23)), 4)
Call CopyMem(sBox(16), m_sBox(4, ERxorK(24), ERxorK(25), ERxorK(26), ERxorK(27), ERxorK(28), ERxorK(29)), 4)
Call CopyMem(sBox(20), m_sBox(5, ERxorK(30), ERxorK(31), ERxorK(32), ERxorK(33), ERxorK(34), ERxorK(35)), 4)
Call CopyMem(sBox(24), m_sBox(6, ERxorK(36), ERxorK(37), ERxorK(38), ERxorK(39), ERxorK(40), ERxorK(41)), 4)
Call CopyMem(sBox(28), m_sBox(7, ERxorK(42), ERxorK(43), ERxorK(44), ERxorK(45), ERxorK(46), ERxorK(47)), 4)
'L[i] xor P(R[i])
LiRi(0) = L(0) Xor sBox(15)
LiRi(1) = L(1) Xor sBox(6)
LiRi(2) = L(2) Xor sBox(19)
LiRi(3) = L(3) Xor sBox(20)
LiRi(4) = L(4) Xor sBox(28)
LiRi(5) = L(5) Xor sBox(11)
LiRi(6) = L(6) Xor sBox(27)
LiRi(7) = L(7) Xor sBox(16)
LiRi(8) = L(8) Xor sBox(0)
LiRi(9) = L(9) Xor sBox(14)
LiRi(10) = L(10) Xor sBox(22)
LiRi(11) = L(11) Xor sBox(25)
LiRi(12) = L(12) Xor sBox(4)
LiRi(13) = L(13) Xor sBox(17)
LiRi(14) = L(14) Xor sBox(30)
LiRi(15) = L(15) Xor sBox(9)
LiRi(16) = L(16) Xor sBox(1)
LiRi(17) = L(17) Xor sBox(7)
LiRi(18) = L(18) Xor sBox(23)
LiRi(19) = L(19) Xor sBox(13)
LiRi(20) = L(20) Xor sBox(31)
LiRi(21) = L(21) Xor sBox(26)
LiRi(22) = L(22) Xor sBox(2)
LiRi(23) = L(23) Xor sBox(8)
LiRi(24) = L(24) Xor sBox(18)
LiRi(25) = L(25) Xor sBox(12)
LiRi(26) = L(26) Xor sBox(29)
LiRi(27) = L(27) Xor sBox(5)
LiRi(28) = L(28) Xor sBox(21)
LiRi(29) = L(29) Xor sBox(10)
LiRi(30) = L(30) Xor sBox(3)
LiRi(31) = L(31) Xor sBox(24)
'Prepare for next round
Call CopyMem(L(0), R(0), 32)
Call CopyMem(R(0), LiRi(0), 32)
Next
'Concatenate R[]L[]
Call CopyMem(RL(0), R(0), 32)
Call CopyMem(RL(32), L(0), 32)
'Apply the invIP permutation
For A = 0 To 63
BinBlock(A) = RL(m_IPInv(A))
Next
'Convert the binaries into a byte array
Call Bin2Byte(BinBlock(), 8, BlockData())
End Sub
Private Static Sub DecryptBlock(BlockData() As Byte)
Dim A As Long
Dim i As Long
Dim L(0 To 31) As Byte
Dim R(0 To 31) As Byte
Dim RL(0 To 63) As Byte
Dim sBox(0 To 31) As Byte
Dim LiRi(0 To 31) As Byte
Dim ERxorK(0 To 47) As Byte
Dim BinBlock(0 To 63) As Byte
'Convert the block into a binary array
'(I do believe this is the best solution
'in VB for the DES algorithm, but it is
'still slow as xxxx)
Call Byte2Bin(BlockData(), 8, BinBlock())
'Apply the IP permutation and split the
'block into two halves, L[] and R[]
For A = 0 To 31
L(A) = BinBlock(m_IP(A))
R(A) = BinBlock(m_IP(A + 32))
Next
'Apply the 16 subkeys on the block
For i = 16 To 1 Step -1
'E(R[i]) xor K[i]
ERxorK(0) = R(31) Xor m_Key(0, i)
ERxorK(1) = R(0) Xor m_Key(1, i)
ERxorK(2) = R(1) Xor m_Key(2, i)
ERxorK(3) = R(2) Xor m_Key(3, i)
ERxorK(4) = R(3) Xor m_Key(4, i)
ERxorK(5) = R(4) Xor m_Key(5, i)
ERxorK(6) = R(3) Xor m_Key(6, i)
ERxorK(7) = R(4) Xor m_Key(7, i)
ERxorK(8) = R(5) Xor m_Key(8, i)
ERxorK(9) = R(6) Xor m_Key(9, i)
ERxorK(10) = R(7) Xor m_Key(10, i)
ERxorK(11) = R(8) Xor m_Key(11, i)
ERxorK(12) = R(7) Xor m_Key(12, i)
ERxorK(13) = R(8) Xor m_Key(13, i)
ERxorK(14) = R(9) Xor m_Key(14, i)
ERxorK(15) = R(10) Xor m_Key(15, i)
ERxorK(16) = R(11) Xor m_Key(16, i)
ERxorK(17) = R(12) Xor m_Key(17, i)
ERxorK(18) = R(11) Xor m_Key(18, i)
ERxorK(19) = R(12) Xor m_Key(19, i)
ERxorK(20) = R(13) Xor m_Key(20, i)
ERxorK(21) = R(14) Xor m_Key(21, i)
ERxorK(22) = R(15) Xor m_Key(22, i)
ERxorK(23) = R(16) Xor m_Key(23, i)
ERxorK(24) = R(15) Xor m_Key(24, i)
ERxorK(25) = R(16) Xor m_Key(25, i)
ERxorK(26) = R(17) Xor m_Key(26, i)
ERxorK(27) = R(18) Xor m_Key(27, i)
ERxorK(28) = R(19) Xor m_Key(28, i)
ERxorK(29) = R(20) Xor m_Key(29, i)
ERxorK(30) = R(19) Xor m_Key(30, i)
ERxorK(31) = R(20) Xor m_Key(31, i)
ERxorK(32) = R(21) Xor m_Key(32, i)
ERxorK(33) = R(22) Xor m_Key(33, i)
ERxorK(34) = R(23) Xor m_Key(34, i)
ERxorK(35) = R(24) Xor m_Key(35, i)
ERxorK(36) = R(23) Xor m_Key(36, i)
ERxorK(37) = R(24) Xor m_Key(37, i)
ERxorK(38) = R(25) Xor m_Key(38, i)
ERxorK(39) = R(26) Xor m_Key(39, i)
ERxorK(40) = R(27) Xor m_Key(40, i)
ERxorK(41) = R(28) Xor m_Key(41, i)
ERxorK(42) = R(27) Xor m_Key(42, i)
ERxorK(43) = R(28) Xor m_Key(43, i)
ERxorK(44) = R(29) Xor m_Key(44, i)
ERxorK(45) = R(30) Xor m_Key(45, i)
ERxorK(46) = R(31) Xor m_Key(46, i)
ERxorK(47) = R(0) Xor m_Key(47, i)
'Apply the s-boxes
Call CopyMem(sBox(0), m_sBox(0, ERxorK(0), ERxorK(1), ERxorK(2), ERxorK(3), ERxorK(4), ERxorK(5)), 4)
Call CopyMem(sBox(4), m_sBox(1, ERxorK(6), ERxorK(7), ERxorK(8), ERxorK(9), ERxorK(10), ERxorK(11)), 4)
Call CopyMem(sBox(8), m_sBox(2, ERxorK(12), ERxorK(13), ERxorK(14), ERxorK(15), ERxorK(16), ERxorK(17)), 4)
Call CopyMem(sBox(12), m_sBox(3, ERxorK(18), ERxorK(19), ERxorK(20), ERxorK(21), ERxorK(22), ERxorK(23)), 4)
Call CopyMem(sBox(16), m_sBox(4, ERxorK(24), ERxorK(25), ERxorK(26), ERxorK(27), ERxorK(28), ERxorK(29)), 4)
Call CopyMem(sBox(20), m_sBox(5, ERxorK(30), ERxorK(31), ERxorK(32), ERxorK(33), ERxorK(34), ERxorK(35)), 4)
Call CopyMem(sBox(24), m_sBox(6, ERxorK(36), ERxorK(37), ERxorK(38), ERxorK(39), ERxorK(40), ERxorK(41)), 4)
Call CopyMem(sBox(28), m_sBox(7, ERxorK(42), ERxorK(43), ERxorK(44), ERxorK(45), ERxorK(46), ERxorK(47)), 4)
'L[i] xor P(R[i])
LiRi(0) = L(0) Xor sBox(15)
LiRi(1) = L(1) Xor sBox(6)
LiRi(2) = L(2) Xor sBox(19)
LiRi(3) = L(3) Xor sBox(20)
LiRi(4) = L(4) Xor sBox(28)
LiRi(5) = L(5) Xor sBox(11)
LiRi(6) = L(6) Xor sBox(27)
LiRi(7) = L(7) Xor sBox(16)
LiRi(8) = L(8) Xor sBox(0)
LiRi(9) = L(9) Xor sBox(14)
LiRi(10) = L(10) Xor sBox(22)
LiRi(11) = L(11) Xor sBox(25)
LiRi(12) = L(12) Xor sBox(4)
LiRi(13) = L(13) Xor sBox(17)
LiRi(14) = L(14) Xor sBox(30)
LiRi(15) = L(15) Xor sBox(9)
LiRi(16) = L(16) Xor sBox(1)
LiRi(17) = L(17) Xor sBox(7)
LiRi(18) = L(18) Xor sBox(23)
LiRi(19) = L(19) Xor sBox(13)
LiRi(20) = L(20) Xor sBox(31)
LiRi(21) = L(21) Xor sBox(26)
LiRi(22) = L(22) Xor sBox(2)
LiRi(23) = L(23) Xor sBox(8)
LiRi(24) = L(24) Xor sBox(18)
LiRi(25) = L(25) Xor sBox(12)
LiRi(26) = L(26) Xor sBox(29)
LiRi(27) = L(27) Xor sBox(5)
LiRi(28) = L(28) Xor sBox(21)
LiRi(29) = L(29) Xor sBox(10)
LiRi(30) = L(30) Xor sBox(3)
LiRi(31) = L(31) Xor sBox(24)
'Prepare for next round
Call CopyMem(L(0), R(0), 32)
Call CopyMem(R(0), LiRi(0), 32)
Next
'Concatenate R[]L[]
Call CopyMem(RL(0), R(0), 32)
Call CopyMem(RL(32), L(0), 32)
'Apply the invIP permutation
For A = 0 To 63
BinBlock(A) = RL(m_IPInv(A))
Next
'Convert the binaries into a byte array
Call Bin2Byte(BinBlock(), 8, BlockData())
End Sub
Public Sub EncryptByte(ByteArray() As Byte, Optional Key As String)
Dim A As Long
Dim Offset As Long
Dim OrigLen As Long
Dim CipherLen As Long
Dim CurrPercent As Long
Dim NextPercent As Long
Dim CurrBlock(0 To 7) As Byte
Dim CipherBlock(0 To 7) As Byte
'Set the key if provided
'设置key 这里应该和c#里面是一样的
If (Len(Key) > 0) Then Me.Key = Key
'Get the size of the original array
'得到要加密数据的长度
OrigLen = UBound(ByteArray) + 1
'First we add 12 bytes (4 bytes for the
'length and 8 bytes for the seed values
'for the CBC routine), and the ciphertext
'must be a multiple of 8 bytes
'不明白这里为什么要加12
'CipherLen = OrigLen + 12
CipherLen = IIf(OrigLen = 0, 8, OrigLen)
'加密字符串处理，不足8的倍数补齐
If (CipherLen Mod 8 <> 0) Then
CipherLen = CipherLen + 8 - (CipherLen Mod 8)
End If
'重新写需要加密的内容
ReDim Preserve ByteArray(CipherLen - 1)
'参数说明
'hpvDest 要移动的目标
'hpvSource 要复制的内容
'cbCopy 要复制的字节数
'不明白这里 是不是从bytearray(12)开始复制ByteArray(0)的origlen个字节
'这里不是很明白..
'Call CopyMem(ByteArray(12), ByteArray(0), OrigLen)
Call CopyMem(ByteArray(0), ByteArray(0), OrigLen)
'Store the length descriptor in bytes [9-12]
'这里更不明白了.ByteArray 8-11 是做什么用的？ 这个OrigLen是做什么的，和复制内存有关系吗？
' 把origLen存储到8-11位
'' Call CopyMem(ByteArray(8), OrigLen, 4)
'Store a block of random data in bytes [1-8],
'these work as seed values for the CBC routine
'and is used to produce different ciphertext
'even when encrypting the same data with the
'same key)
' Call Randomize
' '这里的问题同上..不明白第二个参数是怎么回事。。一个long型数据有什么用
'把随机数存储到ByteArray数组
' Call CopyMem(ByteArray(0), CLng(2147483647 * Rnd), 4)
' Call CopyMem(ByteArray(4), CLng(2147483647 * Rnd), 4)
'''''
'Encrypt the data in 64-bit blocks
'加密数据
For Offset = 0 To (CipherLen - 1) Step 8
'Get the next block of plaintext
'依次从ByteArray中取出8位数据，复制到CurrBlock()
Call CopyMem(CurrBlock(0), ByteArray(Offset), 8)
'XOR the plaintext with the previous
'ciphertext (CBC, Cipher-Block Chaining)
'下面这个循环不明白是做什么的。。
For A = 0 To 7
CurrBlock(A) = CurrBlock(A) Xor CipherBlock(A)
Next
'Encrypt the block
'加密字节数据. 这是标准的加密方法吗？c#里有一个iv和一个key。为什么vb里没有设置iv的地方呢？
'这里说的iv，请看Module1里的代码，其中代码为C#加密源码，下面两个值
' private string iv="12345678";
' private string key="12345678";
Call EncryptBlock(CurrBlock())
'Store the block
'将加密后的内容存储回ByteArray()
Call CopyMem(ByteArray(Offset), CurrBlock(0), 8)
'Store the cipherblock (for CBC)
'这句不明白什么意思..应该是没用吧？
' Call CopyMem(CipherBlock(0), CurrBlock(0), 8)
Next
End Sub
Public Sub DecryptByte(ByteArray() As Byte, Optional Key As String)
Dim A As Long
Dim Offset As Long
Dim OrigLen As Long
Dim CipherLen As Long
Dim CurrPercent As Long
Dim NextPercent As Long
Dim CurrBlock(0 To 7) As Byte
Dim CipherBlock(0 To 7) As Byte
'Set the new key if provided
If (Len(Key) > 0) Then Me.Key = Key
'Get the size of the ciphertext
CipherLen = UBound(ByteArray) + 1
'Decrypt the data in 64-bit blocks
For Offset = 0 To (CipherLen - 1) Step 8
'Get the next block of ciphertext
Call CopyMem(CurrBlock(0), ByteArray(Offset), 8)
'Decrypt the block
Call DecryptBlock(CurrBlock())
'XOR with the previous cipherblock
For A = 0 To 7
CurrBlock(A) = CurrBlock(A) Xor CipherBlock(A)
Next
'Store the current ciphertext to use
'XOR with the next block plaintext
' Call CopyMem(CipherBlock(0), ByteArray(Offset), 8)
'Store the block
Call CopyMem(ByteArray(Offset), CurrBlock(0), 8)
'Update the progress if neccessary
''' If (Offset >= NextPercent) Then
''' CurrPercent = Int((Offset / CipherLen) * 100)
''' NextPercent = (CipherLen * ((CurrPercent + 1) / 100)) + 1
''' RaiseEvent Progress(CurrPercent)
''' End If
Next
'Get the size of the original array
' Call CopyMem(OrigLen, ByteArray(8), 4)
'Make sure OrigLen is a reasonable value,
'if we used the wrong key the next couple
'of statements could be dangerous (GPF)
' If (CipherLen - OrigLen > 19) Or (CipherLen - OrigLen < 12) Then
' Call Err.Raise(vbObjectError, , "Incorrect size descriptor in DES decryption")
' End If
'Resize the bytearray to hold only the plaintext
'and not the extra information added by the
'encryption routine
' Call CopyMem(ByteArray(0), ByteArray(12), OrigLen)
' ReDim Preserve ByteArray(OrigLen - 1)
'Make sure we return a 100% progress
'' If (CurrPercent <> 100) Then RaiseEvent Progress(100)
End Sub
Public Sub EncryptFile(SourceFile As String, DestFile As String, Optional Key As String)
Dim Filenr As Integer
Dim ByteArray() As Byte
' 'Make sure the source file do exist
' If (Not FileExist(SourceFile)) Then
' Call Err.Raise(vbObjectError, , "Error in Skipjack EncryptFile procedure (Source file does not exist).")
' Exit Sub
' End If
'
'Open the source file and read the content
'into a bytearray to pass onto encryption
Filenr = FreeFile
Open SourceFile For Binary As #Filenr
ReDim ByteArray(0 To LOF(Filenr) - 1)
Get #Filenr, , ByteArray()
Close #Filenr
'Encrypt the bytearray
Call EncryptByte(ByteArray(), Key)
'If the destination file already exist we need
'to delete it since opening it for binary use
'will preserve it if it already exist
' If (FileExist(DestFile)) Then Kill DestFile
'Store the encrypted data in the destination file
Filenr = FreeFile
Open DestFile For Binary As #Filenr
Put #Filenr, , ByteArray()
Close #Filenr
End Sub
Public Sub DecryptFile(SourceFile As String, DestFile As String, Optional Key As String)
Dim Filenr As Integer
Dim ByteArray() As Byte
'Make sure the source file do exist
' If (Not FileExist(SourceFile)) Then
' Call Err.Raise(vbObjectError, , "Error in Skipjack EncryptFile procedure (Source file does not exist).")
' Exit Sub
' End If
'Open the source file and read the content
'into a bytearray to decrypt
Filenr = FreeFile
Open SourceFile For Binary As #Filenr
ReDim ByteArray(0 To LOF(Filenr) - 1)
Get #Filenr, , ByteArray()
Close #Filenr
'Decrypt the bytearray
Call DecryptByte(ByteArray(), Key)
'If the destination file already exist we need
'to delete it since opening it for binary use
'will preserve it if it already exist
' If (FileExist(DestFile)) Then Kill DestFile
'Store the decrypted data in the destination file
Filenr = FreeFile
Open DestFile For Binary As #Filenr
Put #Filenr, , ByteArray()
Close #Filenr
End Sub
Private Function EncodeBase64(ByRef arrData() As Byte) As String
Dim objXML As MSXML2.DOMDocument
Dim objNode As MSXML2.IXMLDOMElement
' help from MSXML
Set objXML = New MSXML2.DOMDocument
' byte array to base64
Set objNode = objXML.createElement("b64")
objNode.dataType = "bin.base64"
objNode.nodeTypedValue = arrData
EncodeBase64 = objNode.Text
' thanks, bye
Set objNode = Nothing
Set objXML = Nothing
End Function
Private Function DecodeBase64(ByVal strData As String) As Byte()
Dim objXML As MSXML2.DOMDocument
Dim objNode As MSXML2.IXMLDOMElement
' help from MSXML
Set objXML = New MSXML2.DOMDocument
Set objNode = objXML.createElement("b64")
objNode.dataType = "bin.base64"
objNode.Text = strData
DecodeBase64 = objNode.nodeTypedValue
' thanks, bye
Set objNode = Nothing
Set objXML = Nothing
End Function
Public Function EncryptString(Text As String, Optional Key As String) As String
Dim ByteArray() As Byte
'Convert the text into a byte array
ByteArray() = StrConv(Text, vbFromUnicode)
'ByteArray() = DecodeBase64(Text)
''''' byteA() = StrConv(Text, vbFromUnicode)
''''' 'ByteArray() = DecodeBase64(Text)
''''' Dim ByteArray() As Byte
''''' ReDim ByteArray((UBound(byteA) + 1) * 2 - 1)
''''' Dim i As Integer
''''' For i = 0 To UBound(byteA)
''''' ByteArray(i * 2) = byteA(i)
''''' ByteArray(i * 2 + 1) = 0
''''' Next i
'Encrypt the byte array
Call EncryptByte(ByteArray(), Key)
'Convert the byte array back to a string
' EncryptString = StrConv(ByteArray(), vbUnicode)
EncryptString = EncodeBase64(ByteArray())
End Function
Public Function DecryptString(Text As String, Optional Key As String) As String
Dim ByteArray() As Byte
'Convert the text into a byte array
' ByteArray() = StrConv(Text, vbFromUnicode)
ByteArray() = DecodeBase64(Text)
'Encrypt the byte array
Call DecryptByte(ByteArray(), Key)
'Convert the byte array back to a string EncodeBase64(ByteArray()) '
DecryptString = StrConv(ByteArray(), vbUnicode)
End Function
Public Property Let Key(New_Value As String)
Dim A As Long
Dim i As Long
Dim C(0 To 27) As Byte
Dim D(0 To 27) As Byte
Dim K(0 To 55) As Byte
Dim CD(0 To 55) As Byte
Dim Temp(0 To 1) As Byte
Dim KeyBin(0 To 63) As Byte
Dim KeySchedule(0 To 63) As Byte
'Do nothing if the key is buffered
If (m_KeyValue = New_Value) Then Exit Property
'Store a string value of the buffered key
m_KeyValue = New_Value
'Convert the key to a binary array
Call Byte2Bin(StrConv(New_Value, vbFromUnicode), IIf(Len(New_Value) > 8, 8, Len(New_Value)), KeyBin())
'Apply the PC-2 permutation
For A = 0 To 55
KeySchedule(A) = KeyBin(m_PC1(A))
Next
'Split keyschedule into two halves, C[] and D[]
Call CopyMem(C(0), KeySchedule(0), 28)
Call CopyMem(D(0), KeySchedule(28), 28)
'Calculate the key schedule (16 subkeys)
For i = 1 To 16
'Perform one or two cyclic left shifts on
'both C[i-1] and D[i-1] to get C[i] and D[i]
Call CopyMem(Temp(0), C(0), m_LeftShifts(i))
Call CopyMem(C(0), C(m_LeftShifts(i)), 28 - m_LeftShifts(i))
Call CopyMem(C(28 - m_LeftShifts(i)), Temp(0), m_LeftShifts(i))
Call CopyMem(Temp(0), D(0), m_LeftShifts(i))
Call CopyMem(D(0), D(m_LeftShifts(i)), 28 - m_LeftShifts(i))
Call CopyMem(D(28 - m_LeftShifts(i)), Temp(0), m_LeftShifts(i))
'Concatenate C[] and D[]
Call CopyMem(CD(0), C(0), 28)
Call CopyMem(CD(28), D(0), 28)
'Apply the PC-2 permutation and store
'the calculated subkey
For A = 0 To 47
m_Key(A, i) = CD(m_PC2(A))
Next
Next
End Property
Private Sub Class_Initialize()
Dim i As Long
Dim vE As Variant
Dim vP As Variant
Dim vIP As Variant
Dim vPC1 As Variant
Dim vPC2 As Variant
Dim vIPInv As Variant
Dim vSbox(0 To 7) As Variant
'Initialize the permutation IP
vIP = Array(58, 50, 42, 34, 26, 18, 10, 2, _
60, 52, 44, 36, 28, 20, 12, 4, _
62, 54, 46, 38, 30, 22, 14, 6, _
64, 56, 48, 40, 32, 24, 16, 8, _
57, 49, 41, 33, 25, 17, 9, 1, _
59, 51, 43, 35, 27, 19, 11, 3, _
61, 53, 45, 37, 29, 21, 13, 5, _
63, 55, 47, 39, 31, 23, 15, 7)
'Create the permutation IP
For i = LBound(vIP) To UBound(vIP)
m_IP(i) = (vIP(i) - 1)
Next
'Initialize the expansion function E
vE = Array(32, 1, 2, 3, 4, 5, _
4, 5, 6, 7, 8, 9, _
8, 9, 10, 11, 12, 13, _
12, 13, 14, 15, 16, 17, _
16, 17, 18, 19, 20, 21, _
20, 21, 22, 23, 24, 25, _
24, 25, 26, 27, 28, 29, _
28, 29, 30, 31, 32, 1)
'Create the expansion array
For i = LBound(vE) To UBound(vE)
m_E(i) = (vE(i) - 1)
Next
'Initialize the PC1 function
vPC1 = Array(57, 49, 41, 33, 25, 17, 9, _
1, 58, 50, 42, 34, 26, 18, _
10, 2, 59, 51, 43, 35, 27, _
19, 11, 3, 60, 52, 44, 36, _
63, 55, 47, 39, 31, 23, 15, _
7, 62, 54, 46, 38, 30, 22, _
14, 6, 61, 53, 45, 37, 29, _
21, 13, 5, 28, 20, 12, 4)
'Create the PC1 function
For i = LBound(vPC1) To UBound(vPC1)
m_PC1(i) = (vPC1(i) - 1)
Next
'Initialize the PC2 function
vPC2 = Array(14, 17, 11, 24, 1, 5, _
3, 28, 15, 6, 21, 10, _
23, 19, 12, 4, 26, 8, _
16, 7, 27, 20, 13, 2, _
41, 52, 31, 37, 47, 55, _
30, 40, 51, 45, 33, 48, _
44, 49, 39, 56, 34, 53, _
46, 42, 50, 36, 29, 32)
'Create the PC2 function
For i = LBound(vPC2) To UBound(vPC2)
m_PC2(i) = (vPC2(i) - 1)
Next
'Initialize the inverted IP
vIPInv = Array(40, 8, 48, 16, 56, 24, 64, 32, _
39, 7, 47, 15, 55, 23, 63, 31, _
38, 6, 46, 14, 54, 22, 62, 30, _
37, 5, 45, 13, 53, 21, 61, 29, _
36, 4, 44, 12, 52, 20, 60, 28, _
35, 3, 43, 11, 51, 19, 59, 27, _
34, 2, 42, 10, 50, 18, 58, 26, _
33, 1, 41, 9, 49, 17, 57, 25)
'Create the inverted IP
For i = LBound(vIPInv) To UBound(vIPInv)
m_IPInv(i) = (vIPInv(i) - 1)
Next
'Initialize permutation P
vP = Array(16, 7, 20, 21, _
29, 12, 28, 17, _
1, 15, 23, 26, _
5, 18, 31, 10, _
2, 8, 24, 14, _
32, 27, 3, 9, _
19, 13, 30, 6, _
22, 11, 4, 25)
'Create P
For i = LBound(vP) To UBound(vP)
m_P(i) = (vP(i) - 1)
Next
'Initialize the leftshifts array
For i = 1 To 16
Select Case i
Case 1, 2, 9, 16
m_LeftShifts(i) = 1
Case Else
m_LeftShifts(i) = 2
End Select
Next
'Initialize the eight s-boxes
vSbox(0) = Array(14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, _
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, _
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, _
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13)
vSbox(1) = Array(15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, _
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, _
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, _
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9)
vSbox(2) = Array(10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, _
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, _
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, _
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12)
vSbox(3) = Array(7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, _
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, _
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, _
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14)
vSbox(4) = Array(2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, _
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, _
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, _
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3)
vSbox(5) = Array(12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, _
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, _
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, _
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13)
vSbox(6) = Array(4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, _
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, _
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, _
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12)
vSbox(7) = Array(13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, _
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, _
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, _
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11)
Dim lBox As Long
Dim lRow As Long
Dim lColumn As Long
Dim TheByte(0) As Byte
Dim TheBin(0 To 7) As Byte
Dim A As Byte, B As Byte, C As Byte, D As Byte, e As Byte, F As Byte
'Create an optimized version of the s-boxes
'this is not in the standard but much faster
'than calculating the Row/Column index later
For lBox = 0 To 7
For A = 0 To 1
For B = 0 To 1
For C = 0 To 1
For D = 0 To 1
For e = 0 To 1
For F = 0 To 1
lRow = A * 2 + F
lColumn = B * 8 + C * 4 + D * 2 + e
TheByte(0) = vSbox(lBox)(lRow * 16 + lColumn)
Call Byte2Bin(TheByte(), 1, TheBin())
Call CopyMem(m_sBox(lBox, A, B, C, D, e, F), TheBin(4), 4)
Next
Next
Next
Next
Next
Next
Next
End Sub
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