📄 desencode.bas
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'P变换
CodeP(i) = RetS(P(i))
'产生L11,R11
R11(i) = L10(i) Xor CodeP(i)
L11(i) = R10(i)
Next
'进行第12次迭代
For i = 0 To 47
CodeE(i) = R11(E(i)) '经过E变换扩充，由32位变为48位
CodeE(i) = CodeE(i) Xor K12(i) '与K12按位作不进位加法运算
Next
'分8组
For i = 0 To 5
CodeS1(i) = CodeE(i)
CodeS2(i) = CodeE(i + 6)
CodeS3(i) = CodeE(i + 12)
CodeS4(i) = CodeE(i + 18)
CodeS5(i) = CodeE(i + 24)
CodeS6(i) = CodeE(i + 30)
CodeS7(i) = CodeE(i + 36)
CodeS8(i) = CodeE(i + 42)
Next
'S盒运算，得到8个数
s(0) = S1(CodeS1(5) + CodeS1(0) * 2, CodeS1(4) + CodeS1(3) * 2 + CodeS1(2) * 4 + CodeS1(1) * 8)
s(1) = S2(CodeS2(5) + CodeS2(0) * 2, CodeS2(4) + CodeS2(3) * 2 + CodeS2(2) * 4 + CodeS2(1) * 8)
s(2) = S3(CodeS3(5) + CodeS3(0) * 2, CodeS3(4) + CodeS3(3) * 2 + CodeS3(2) * 4 + CodeS3(1) * 8)
s(3) = S4(CodeS4(5) + CodeS4(0) * 2, CodeS4(4) + CodeS4(3) * 2 + CodeS4(2) * 4 + CodeS4(1) * 8)
s(4) = S5(CodeS5(5) + CodeS5(0) * 2, CodeS5(4) + CodeS5(3) * 2 + CodeS5(2) * 4 + CodeS5(1) * 8)
s(5) = S6(CodeS6(5) + CodeS6(0) * 2, CodeS6(4) + CodeS6(3) * 2 + CodeS6(2) * 4 + CodeS6(1) * 8)
s(6) = S7(CodeS7(5) + CodeS7(0) * 2, CodeS7(4) + CodeS7(3) * 2 + CodeS7(2) * 4 + CodeS7(1) * 8)
s(7) = S8(CodeS8(5) + CodeS8(0) * 2, CodeS8(4) + CodeS8(3) * 2 + CodeS8(2) * 4 + CodeS8(1) * 8)
'S盒运算32位结果
For i = 0 To 7
RetS(i * 4 + 0) = (s(i) And &H8) \ &H8
RetS(i * 4 + 1) = (s(i) And &H4) \ &H4
RetS(i * 4 + 2) = (s(i) And &H2) \ &H2
RetS(i * 4 + 3) = (s(i) And &H1) \ &H1
Next
For i = 0 To 31
'P变换
CodeP(i) = RetS(P(i))
'产生L12,R12
R12(i) = L11(i) Xor CodeP(i)
L12(i) = R11(i)
Next
'进行第13次迭代
For i = 0 To 47
CodeE(i) = R12(E(i)) '经过E变换扩充，由32位变为48位
CodeE(i) = CodeE(i) Xor K13(i) '与K13按位作不进位加法运算
Next
'分8组
For i = 0 To 5
CodeS1(i) = CodeE(i)
CodeS2(i) = CodeE(i + 6)
CodeS3(i) = CodeE(i + 12)
CodeS4(i) = CodeE(i + 18)
CodeS5(i) = CodeE(i + 24)
CodeS6(i) = CodeE(i + 30)
CodeS7(i) = CodeE(i + 36)
CodeS8(i) = CodeE(i + 42)
Next
'S盒运算，得到8个数
s(0) = S1(CodeS1(5) + CodeS1(0) * 2, CodeS1(4) + CodeS1(3) * 2 + CodeS1(2) * 4 + CodeS1(1) * 8)
s(1) = S2(CodeS2(5) + CodeS2(0) * 2, CodeS2(4) + CodeS2(3) * 2 + CodeS2(2) * 4 + CodeS2(1) * 8)
s(2) = S3(CodeS3(5) + CodeS3(0) * 2, CodeS3(4) + CodeS3(3) * 2 + CodeS3(2) * 4 + CodeS3(1) * 8)
s(3) = S4(CodeS4(5) + CodeS4(0) * 2, CodeS4(4) + CodeS4(3) * 2 + CodeS4(2) * 4 + CodeS4(1) * 8)
s(4) = S5(CodeS5(5) + CodeS5(0) * 2, CodeS5(4) + CodeS5(3) * 2 + CodeS5(2) * 4 + CodeS5(1) * 8)
s(5) = S6(CodeS6(5) + CodeS6(0) * 2, CodeS6(4) + CodeS6(3) * 2 + CodeS6(2) * 4 + CodeS6(1) * 8)
s(6) = S7(CodeS7(5) + CodeS7(0) * 2, CodeS7(4) + CodeS7(3) * 2 + CodeS7(2) * 4 + CodeS7(1) * 8)
s(7) = S8(CodeS8(5) + CodeS8(0) * 2, CodeS8(4) + CodeS8(3) * 2 + CodeS8(2) * 4 + CodeS8(1) * 8)
'S盒运算32位结果
For i = 0 To 7
RetS(i * 4 + 0) = (s(i) And &H8) \ &H8
RetS(i * 4 + 1) = (s(i) And &H4) \ &H4
RetS(i * 4 + 2) = (s(i) And &H2) \ &H2
RetS(i * 4 + 3) = (s(i) And &H1) \ &H1
Next
For i = 0 To 31
'P变换
CodeP(i) = RetS(P(i))
'产生L13,R13
R13(i) = L12(i) Xor CodeP(i)
L13(i) = R12(i)
Next
'进行第14次迭代
For i = 0 To 47
CodeE(i) = R13(E(i)) '经过E变换扩充，由32位变为48位
CodeE(i) = CodeE(i) Xor K14(i) '与K14按位作不进位加法运算
Next
'分8组
For i = 0 To 5
CodeS1(i) = CodeE(i)
CodeS2(i) = CodeE(i + 6)
CodeS3(i) = CodeE(i + 12)
CodeS4(i) = CodeE(i + 18)
CodeS5(i) = CodeE(i + 24)
CodeS6(i) = CodeE(i + 30)
CodeS7(i) = CodeE(i + 36)
CodeS8(i) = CodeE(i + 42)
Next
'S盒运算，得到8个数
s(0) = S1(CodeS1(5) + CodeS1(0) * 2, CodeS1(4) + CodeS1(3) * 2 + CodeS1(2) * 4 + CodeS1(1) * 8)
s(1) = S2(CodeS2(5) + CodeS2(0) * 2, CodeS2(4) + CodeS2(3) * 2 + CodeS2(2) * 4 + CodeS2(1) * 8)
s(2) = S3(CodeS3(5) + CodeS3(0) * 2, CodeS3(4) + CodeS3(3) * 2 + CodeS3(2) * 4 + CodeS3(1) * 8)
s(3) = S4(CodeS4(5) + CodeS4(0) * 2, CodeS4(4) + CodeS4(3) * 2 + CodeS4(2) * 4 + CodeS4(1) * 8)
s(4) = S5(CodeS5(5) + CodeS5(0) * 2, CodeS5(4) + CodeS5(3) * 2 + CodeS5(2) * 4 + CodeS5(1) * 8)
s(5) = S6(CodeS6(5) + CodeS6(0) * 2, CodeS6(4) + CodeS6(3) * 2 + CodeS6(2) * 4 + CodeS6(1) * 8)
s(6) = S7(CodeS7(5) + CodeS7(0) * 2, CodeS7(4) + CodeS7(3) * 2 + CodeS7(2) * 4 + CodeS7(1) * 8)
s(7) = S8(CodeS8(5) + CodeS8(0) * 2, CodeS8(4) + CodeS8(3) * 2 + CodeS8(2) * 4 + CodeS8(1) * 8)
'S盒运算32位结果
For i = 0 To 7
RetS(i * 4 + 0) = (s(i) And &H8) \ &H8
RetS(i * 4 + 1) = (s(i) And &H4) \ &H4
RetS(i * 4 + 2) = (s(i) And &H2) \ &H2
RetS(i * 4 + 3) = (s(i) And &H1) \ &H1
Next
For i = 0 To 31
'P变换
CodeP(i) = RetS(P(i))
'产生L14,R14
R14(i) = L13(i) Xor CodeP(i)
L14(i) = R13(i)
Next
'进行第15次迭代
For i = 0 To 47
CodeE(i) = R14(E(i)) '经过E变换扩充，由32位变为48位
CodeE(i) = CodeE(i) Xor K15(i) '与K15按位作不进位加法运算
Next
'分8组
For i = 0 To 5
CodeS1(i) = CodeE(i)
CodeS2(i) = CodeE(i + 6)
CodeS3(i) = CodeE(i + 12)
CodeS4(i) = CodeE(i + 18)
CodeS5(i) = CodeE(i + 24)
CodeS6(i) = CodeE(i + 30)
CodeS7(i) = CodeE(i + 36)
CodeS8(i) = CodeE(i + 42)
Next
'S盒运算，得到8个数
s(0) = S1(CodeS1(5) + CodeS1(0) * 2, CodeS1(4) + CodeS1(3) * 2 + CodeS1(2) * 4 + CodeS1(1) * 8)
s(1) = S2(CodeS2(5) + CodeS2(0) * 2, CodeS2(4) + CodeS2(3) * 2 + CodeS2(2) * 4 + CodeS2(1) * 8)
s(2) = S3(CodeS3(5) + CodeS3(0) * 2, CodeS3(4) + CodeS3(3) * 2 + CodeS3(2) * 4 + CodeS3(1) * 8)
s(3) = S4(CodeS4(5) + CodeS4(0) * 2, CodeS4(4) + CodeS4(3) * 2 + CodeS4(2) * 4 + CodeS4(1) * 8)
s(4) = S5(CodeS5(5) + CodeS5(0) * 2, CodeS5(4) + CodeS5(3) * 2 + CodeS5(2) * 4 + CodeS5(1) * 8)
s(5) = S6(CodeS6(5) + CodeS6(0) * 2, CodeS6(4) + CodeS6(3) * 2 + CodeS6(2) * 4 + CodeS6(1) * 8)
s(6) = S7(CodeS7(5) + CodeS7(0) * 2, CodeS7(4) + CodeS7(3) * 2 + CodeS7(2) * 4 + CodeS7(1) * 8)
s(7) = S8(CodeS8(5) + CodeS8(0) * 2, CodeS8(4) + CodeS8(3) * 2 + CodeS8(2) * 4 + CodeS8(1) * 8)
'S盒运算32位结果
For i = 0 To 7
RetS(i * 4 + 0) = (s(i) And &H8) \ &H8
RetS(i * 4 + 1) = (s(i) And &H4) \ &H4
RetS(i * 4 + 2) = (s(i) And &H2) \ &H2
RetS(i * 4 + 3) = (s(i) And &H1) \ &H1
Next
For i = 0 To 31
'P变换
CodeP(i) = RetS(P(i))
'产生L15,R15
R15(i) = L14(i) Xor CodeP(i)
L15(i) = R14(i)
Next
'进行第16次迭代
For i = 0 To 47
CodeE(i) = R15(E(i)) '经过E变换扩充，由32位变为48位
CodeE(i) = CodeE(i) Xor K16(i) '与K16按位作不进位加法运算
Next
'分8组
For i = 0 To 5
CodeS1(i) = CodeE(i)
CodeS2(i) = CodeE(i + 6)
CodeS3(i) = CodeE(i + 12)
CodeS4(i) = CodeE(i + 18)
CodeS5(i) = CodeE(i + 24)
CodeS6(i) = CodeE(i + 30)
CodeS7(i) = CodeE(i + 36)
CodeS8(i) = CodeE(i + 42)
Next
'S盒运算，得到8个数
s(0) = S1(CodeS1(5) + CodeS1(0) * 2, CodeS1(4) + CodeS1(3) * 2 + CodeS1(2) * 4 + CodeS1(1) * 8)
s(1) = S2(CodeS2(5) + CodeS2(0) * 2, CodeS2(4) + CodeS2(3) * 2 + CodeS2(2) * 4 + CodeS2(1) * 8)
s(2) = S3(CodeS3(5) + CodeS3(0) * 2, CodeS3(4) + CodeS3(3) * 2 + CodeS3(2) * 4 + CodeS3(1) * 8)
s(3) = S4(CodeS4(5) + CodeS4(0) * 2, CodeS4(4) + CodeS4(3) * 2 + CodeS4(2) * 4 + CodeS4(1) * 8)
s(4) = S5(CodeS5(5) + CodeS5(0) * 2, CodeS5(4) + CodeS5(3) * 2 + CodeS5(2) * 4 + CodeS5(1) * 8)
s(5) = S6(CodeS6(5) + CodeS6(0) * 2, CodeS6(4) + CodeS6(3) * 2 + CodeS6(2) * 4 + CodeS6(1) * 8)
s(6) = S7(CodeS7(5) + CodeS7(0) * 2, CodeS7(4) + CodeS7(3) * 2 + CodeS7(2) * 4 + CodeS7(1) * 8)
s(7) = S8(CodeS8(5) + CodeS8(0) * 2, CodeS8(4) + CodeS8(3) * 2 + CodeS8(2) * 4 + CodeS8(1) * 8)
'S盒运算32位结果
For i = 0 To 7
RetS(i * 4 + 0) = (s(i) And &H8) \ &H8
RetS(i * 4 + 1) = (s(i) And &H4) \ &H4
RetS(i * 4 + 2) = (s(i) And &H2) \ &H2
RetS(i * 4 + 3) = (s(i) And &H1) \ &H1
Next
For i = 0 To 31
'P变换
CodeP(i) = RetS(P(i))
'产生L15,R15
R16(i) = L15(i) Xor CodeP(i)
L16(i) = R15(i)
Next
Dim tempMW(63) As Byte
For i = 0 To 31
tempMW(i) = L16(i)
tempMW(i + 32) = R16(i)
Next i
For i = 0 To 63
tempReturn(i) = tempMW(IP_1(i))
Next i
'2进制转10进制
Dim tempInt As Integer
Dim tempI As Integer
For i = 1 To 64
tempInt = tempInt + tempReturn(i - 1) * 2 ^ (8 - i + tempI * 8)
If i \ 8 = i / 8 Then
sData(tempI) = tempInt
tempI = tempI + 1
tempInt = 0
End If
Next i
End Function
'DES解密函数
'sCode 待解密字串
'sKey 密钥字串
'tReturn 返回明文
Function DESDe(sCode() As Byte, sKey As String, ByRef tReturn() As Byte)
Dim tempKey() As Byte '存放密钥
Dim BinKey(63) As Byte '64位二进制原始密钥
Dim KeyPC_1(55) As Byte '存放56位密钥
Dim tempCode(7) As Byte '存放8位原始密文
Dim BinCode(63) As Byte '存放64位明文
Dim CodeIP(63) As Byte '存放IP置换结果
Dim CodeE(47) As Byte 'E膨胀结果
Dim CodeP(31) As Byte 'P变换结果
Dim RetS(47) As Byte 'S盒运算32位结果
Dim s(7) As Byte 'S盒运算8个结果
Dim CodeS1(5) As Byte: Dim CodeS2(5) As Byte: Dim CodeS3(5) As Byte: Dim CodeS4(5) As Byte
Dim CodeS5(5) As Byte: Dim CodeS6(5) As Byte: Dim CodeS7(5) As Byte: Dim CodeS8(5) As Byte
Dim L0(31) As Byte: Dim R0(31) As Byte
Dim L1(31) As Byte: Dim R1(31) As Byte
Dim L2(31) As Byte: Dim R2(31) As Byte
Dim L3(31) As Byte: Dim R3(31) As Byte
Dim L4(31) As Byte: Dim R4(31) As Byte
Dim L5(31) As Byte: Dim R5(31) As Byte
Dim L6(31) As Byte: Dim R6(31) As Byte
Dim L7(31) As Byte: Dim R7(31) As Byte
Dim L8(31) As Byte: Dim R8(31) As Byte
Dim L9(31) As Byte: Dim R9(31) As Byte
Dim L10(31) As Byte: Dim R10(31) As Byte
Dim L11(31) As Byte: Dim R11(31) As Byte
Dim L12(31) As Byte: Dim R12(31) As Byte
Dim L13(31) As Byte: Dim R13(31) As Byte
Dim L14(31) As Byte: Dim R14(31) As Byte
Dim L15(31) As Byte: Dim R15(31) As Byte
Dim L16(31) As Byte: Dim R16(31) As Byte
Dim C0(27) As Byte: Dim D0(27) As Byte '16个密钥
Dim C1(27) As Byte: Dim D1(27) As Byte
Dim C2(27) As Byte: Dim D2(27) As Byte:
Dim C3(27) As Byte: Dim D3(27) As Byte:
Dim C4(27) As Byte: Dim D4(27) As Byte:
Dim C5(27) As Byte: Dim D5(27) As Byte:
Dim C6(27) As Byte: Dim D6(27) As Byte:
Dim C7(27) As Byte: Dim D7(27) As Byte:
Dim C8(27) As Byte: Dim D8(27) As Byte:
Dim C9(27) As Byte: Dim D9(27) As Byte:
Dim C10(27) As Byte: Dim D10(27) As Byte:
Dim C11(27) As Byte: Dim D11(27) As Byte:
Dim C12(27) As Byte: Dim D12(27) As Byte:
Dim C13(27) As Byte: Dim D13(27) As Byte:
Dim C14(27) As Byte: Dim D14(27) As Byte:
Dim C15(27) As Byte: Dim D15(27) As Byte:
Dim C16(27) As Byte: Dim D16(27) As Byte:
Dim C_D(55) As Byte 'Cn,Dn合并后的存放处
Dim K1(47) As Byte: Dim K2(47) As Byte: Dim K3(47) As Byte: Dim K4(47) As Byte:
Dim K5(47) As Byte: Dim K6(47) As Byte: Dim K7(47) As Byte: Dim K8(47) As Byte:
Dim K9(47) As Byte: Dim K10(47) As Byte: Dim K11(47) As Byte: Dim K12(47) As Byte:
Dim K13(47) As Byte: Dim K14(47) As Byte: Dim K15(47) As Byte: Dim K16(47) As Byte:
Dim i As Integer
Dim j As Integer
'取密钥的前8字节
tempKey = StrConv(sKey, vbFromUnicode)
ReDim Preserve tempKey(7)
For i = 0 To 7
BinKey(i * 8 + 0) = (tempKey(i) And &H80) \ &H80
BinKey(i * 8 + 1) = (tempKey(i) And &H40) \ &H40
BinKey(i * 8 + 2) = (tempKey(i) And &H20) \ &H20
BinKey(i * 8 + 3) = (tempKey(i) And &H10) \ &H10
BinKey(i * 8 + 4) = (tempKey(i) And &H8) \ &H8
BinKey(i * 8 + 5) = (tempKey(i) And &H4) \ &H4
BinKey(i * 8 + 6) = (tempKey(i) And &H2) \ &H2
BinKey(i * 8 + 7) = (tempKey(i) And &H1) \ &H1
Next
'PC_1转换
For i = 0 To 55
KeyPC_1(i) = BinKey(PC_1(i))
Next
'生成C0,D0
For i = 0 To 27
C0(i) = KeyPC_1(i)
D0(i) = KeyPC_1(i + 28)
Next
'---------------------------------------------------K1
'生成C1,D1
For i = 0 To 26
C1(i) = C0(i + Lsi(1))
D1(i) = D0(i + Lsi(1))
Next
C1(27) = C0(0)
D1(27) = D0(0)
'组合C1,D1成C_D
For i = 0 To 27
C_D(i) = C1(i)
C_D(i + 28) = D1(i)
Next
'PC_2转换,生成K1
For i = 0 To 47
K1(i) = C_D(PC_2(i))
Next
'---------------------------------------------------K2
'生成C2,D2
For i = 0 To 26
C2(i) = C1(i + Lsi(2))
D2(i) = D1(i + Lsi(2))
Next
C2(27) = C1(0)
D2(27) = D1(0)
'组合C2,D2成C_D
For i = 0 To 27
C_D(i) = C2(i)
C_D(i + 28) = D2(i)
Next
'PC_2转换,生成K2
For i = 0 To 47
K2(i) = C_D(PC_2(i))
Next
'---------------------------------------------------K3
'生成C3,D3
For i = 0 To 25
C3(i) = C2(i + Lsi(3))
D3(i) = D2(i + Lsi(3))
Next
C3(26) = C2(0)
D3(26) = D2(0)
C3(27) = C2(1)
D3(27) = D2(1)
'组合C3,D3成C_D
For i = 0 To 27
C_D(i) = C3(i)
C_D(i + 28) = D3(i)
Next
'PC_2转换,生成K3
For i = 0 To 47
K3(i) = C_D(PC_2(i))
Next
'---------------------------------------------------K4
'生成C4,D4
For i = 0 To 25
C4(i) = C3(i + Lsi(4))
D4(i) = D3(i + Lsi(4))
Next
C4(26) = C3(0)
D4(26) = D3(0)
C4(27) = C3(1)
D4(27) = D3(1)
'组合C4,D4成C_D
For i = 0 To 27
C_D(i) = C4(i)
C_D(i + 28) = D4(i)
Next
'PC_2转换,生成K4
For i = 0 To 47
K4(i) = C_D(PC_2(i))
Next
'---------------------------------------------------K5
'生成C5,D5
For i = 0 To 25
C5(i) = C4(i + Lsi(5))
D5(i) = D4(i + Lsi(5))
Next
C5(26) = C4(0)
D5(26) = D4(0)
C5(27) = C4(1)
D5(27) = D4(1)
'组合C5,D5成C_D
For i = 0 To 27
C_D(i) = C5(i)
C_D(i + 28) = D5(i)
Next
'PC_2转换,生成K5
For i = 0 To 47
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