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用vb实现DES加解密算法(三)--解密 (转)

原创 IT综合 作者:amyz 时间:2007-11-25 09:35:43 0 删除 编辑
用vb实现DES加解密算法(三)--解密 (转)[@more@]

  'SCOde  待解密字串
  'sKey  密钥字串
  Public Sub DES_Decode(ByRef sCode() As Byte, ByVal sKey As String, ByRef bReturn() As Byte)
Attribute DES_Decode.VB_Description = "解密  sCode:密文16进制串  sKey:密钥文本,前8位有效  bReturn:明文16进制串"
 
  Dim LenTimes As Integer  '明文
 
  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 tempReturn(7) As Byte  '存放8位明文
  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
  K5(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K6
  '生成C6,D6
  For i = 0 To 25
  C6(i) = C5(i + Lsi(6))
  D6(i) = D5(i + Lsi(6))
  Next
  C6(26) = C5(0)
  D6(26) = D5(0)
  C6(27) = C5(1)
  D6(27) = D5(1)
 
  '组合C6,D6成C_D
  For i = 0 To 27
  C_D(i) = C6(i)
  C_D(i + 28) = D6(i)
  Next
 
  'PC_2转换,生成K6
  For i = 0 To 47
  K6(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K7
  '生成C7,D7
  For i = 0 To 25
  C7(i) = C6(i + Lsi(7))
  D7(i) = D6(i + Lsi(7))
  Next
  C7(26) = C6(0)
  D7(26) = D6(0)
  C7(27) = C6(1)
  D7(27) = D6(1)
 
  '组合C7,D7成C_D
  For i = 0 To 27
  C_D(i) = C7(i)
  C_D(i + 28) = D7(i)
  Next
 
  'PC_2转换,生成K7
  For i = 0 To 47
  K7(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K8
  '生成C8,D8
  For i = 0 To 25
  C8(i) = C7(i + Lsi(8))
  D8(i) = D7(i + Lsi(8))
  Next
  C8(26) = C7(0)
  D8(26) = D7(0)
  C8(27) = C7(1)
  D8(27) = D7(1)
 
  '组合C8,D8成C_D
  For i = 0 To 27
  C_D(i) = C8(i)
  C_D(i + 28) = D8(i)
  Next
 
  'PC_2转换,生成K8
  For i = 0 To 47
  K8(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K9
  '生成C9,D9
  For i = 0 To 26
  C9(i) = C8(i + Lsi(9))
  D9(i) = D8(i + Lsi(9))
  Next
  C9(27) = C8(0)
  D9(27) = D8(0)
 
  '组合C9,D9成C_D
  For i = 0 To 27
  C_D(i) = C9(i)
  C_D(i + 28) = D9(i)
  Next
 
  'PC_2转换,生成K9
  For i = 0 To 47
  K9(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K10
  '生成C10,D10
  For i = 0 To 25
  C10(i) = C9(i + Lsi(10))
  D10(i) = D9(i + Lsi(10))
  Next
  C10(26) = C9(0)
  D10(26) = D9(0)
  C10(27) = C9(1)
  D10(27) = D9(1)
 
  '组合C10,D10成C_D
  For i = 0 To 27
  C_D(i) = C10(i)
  C_D(i + 28) = D10(i)
  Next
 
  'PC_2转换,生成K10
  For i = 0 To 47
  K10(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K11
  '生成C11,D11
  For i = 0 To 25
  C11(i) = C10(i + Lsi(11))
  D11(i) = D10(i + Lsi(11))
  Next
  C11(26) = C10(0)
  D11(26) = D10(0)
  C11(27) = C10(1)
  D11(27) = D10(1)
 
  '组合C11,D11成C_D
  For i = 0 To 27
  C_D(i) = C11(i)
  C_D(i + 28) = D11(i)
  Next
 
  'PC_2转换,生成K11
  For i = 0 To 47
  K11(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K12
  '生成C12,D12
  For i = 0 To 25
  C12(i) = C11(i + Lsi(12))
  D12(i) = D11(i + Lsi(12))
  Next
  C12(26) = C11(0)
  D12(26) = D11(0)
  C12(27) = C11(1)
  D12(27) = D11(1)
 
  '组合C12,D12成C_D
  For i = 0 To 27
  C_D(i) = C12(i)
  C_D(i + 28) = D12(i)
  Next
 
  'PC_2转换,生成K12
  For i = 0 To 47
  K12(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K13
  '生成C13,D13
  For i = 0 To 25
  C13(i) = C12(i + Lsi(13))
  D13(i) = D12(i + Lsi(13))
  Next
  C13(26) = C12(0)
  D13(26) = D12(0)
  C13(27) = C12(1)
  D13(27) = D12(1)
 
  '组合C13,D13成C_D
  For i = 0 To 27
  C_D(i) = C13(i)
  C_D(i + 28) = D13(i)
  Next
 
  'PC_2转换,生成K13
  For i = 0 To 47
  K13(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K14
  '生成C14,D14
  For i = 0 To 25
  C14(i) = C13(i + Lsi(14))
  D14(i) = D13(i + Lsi(14))
  Next
  C14(26) = C13(0)
  D14(26) = D13(0)
  C14(27) = C13(1)
  D14(27) = D13(1)
 
  '组合C14,D14成C_D
  For i = 0 To 27
  C_D(i) = C14(i)
  C_D(i + 28) = D14(i)
  Next
 
  'PC_2转换,生成K14
  For i = 0 To 47
  K14(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K15
  '生成C15,D15
  For i = 0 To 25
  C15(i) = C14(i + Lsi(15))
  D15(i) = D14(i + Lsi(15))
  Next
  C15(26) = C14(0)
  D15(26) = D14(0)
  C15(27) = C14(1)
  D15(27) = D14(1)
 
  '组合C15,D15成C_D
  For i = 0 To 27
  C_D(i) = C15(i)
  C_D(i + 28) = D15(i)
  Next
 
  'PC_2转换,生成K15
  For i = 0 To 47
  K15(i) = C_D(PC_2(i))
  Next
 
  '***************************************************K16
  '生成C16,D16
  For i = 0 To 26
  C16(i) = C15(i + Lsi(16))
  D16(i) = D15(i + Lsi(16))
  Next
  C16(27) = C15(0)
  D16(27) = D15(0)
 
  '组合C16,D16成C_D
  For i = 0 To 27
  C_D(i) = C16(i)
  C_D(i + 28) = D16(i)
  Next
 
  'PC_2转换,生成K16
  For i = 0 To 47
  K16(i) = C_D(PC_2(i))
  Next
 
  '**************************************************************************************
 
  '加密过程
'将明文位数扩展为8的倍数
If (UBound(sCode) + 1) Mod 8 > 0 Then ReDim Preserve sCode(((UBound(sCode) + 1) 8 + 1) * 8 - 1)
'定义返回密文长度
ReDim bReturn(UBound(sCode))

For j = 0 To UBound(sCode) Step 8
  CopyMemory tempCode(0), sCode(j), 8
  For i = 0 To 7
  BinCode(i * 8 + 0) = (tempCode(i) And &H80) &H80
  BinCode(i * 8 + 1) = (tempCode(i) And &H40) &H40
  BinCode(i * 8 + 2) = (tempCode(i) And &H20) &H20
  BinCode(i * 8 + 3) = (tempCode(i) And &H10) &H10
  BinCode(i * 8 + 4) = (tempCode(i) And &H8) &H8
  BinCode(i * 8 + 5) = (tempCode(i) And &H4) &H4
  BinCode(i * 8 + 6) = (tempCode(i) And &H2) &H2
  BinCode(i * 8 + 7) = (tempCode(i) And &H1) &H1
  Next
 
  'IP置换
  For i = 0 To 63
  CodeIP(i) = BinCode(IP(i))
  Next
 
  '分段
  For i = 0 To 31
  R0(i) = CodeIP(i)
  L0(i) = CodeIP(i + 32)
  Next
 
  '进行第一次迭代
  For i = 0 To 47
  CodeE(i) = R0(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L1,R1
  R1(i) = L0(i) Xor CodeP(i)
  L1(i) = R0(i)
  Next
 
 
  '进行第二次迭代
  For i = 0 To 47
  CodeE(i) = R1(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L2,R2
  R2(i) = L1(i) Xor CodeP(i)
  L2(i) = R1(i)
  Next
 
  '进行第三次迭代
  For i = 0 To 47
  CodeE(i) = R2(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L3,R3
  R3(i) = L2(i) Xor CodeP(i)
  L3(i) = R2(i)
  Next
 
 
  '进行第四次迭代
  For i = 0 To 47
  CodeE(i) = R3(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L4,R4
  R4(i) = L3(i) Xor CodeP(i)
  L4(i) = R3(i)
  Next
 
 
  '进行第五次迭代
  For i = 0 To 47
  CodeE(i) = R4(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L5,R5
  R5(i) = L4(i) Xor CodeP(i)
  L5(i) = R4(i)
  Next
 
 
 
  '进行第六次迭代
  For i = 0 To 47
  CodeE(i) = R5(E(i))  '经过E变换扩充,由32位变为48位
  CodeE(i) = CodeE(i) Xor K11(i)  '与K11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L6,R6
  R6(i) = L5(i) Xor CodeP(i)
  L6(i) = R5(i)
  Next
 
 
 
  '进行第7次迭代
  For i = 0 To 47
  CodeE(i) = R6(E(i))  '经过E变换扩充,由32位变为48位
  CodeE(i) = CodeE(i) Xor K10(i)  '与K10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L7,R7
  R7(i) = L6(i) Xor CodeP(i)
  L7(i) = R6(i)
  Next
 
 
 
  '进行第8次迭代
  For i = 0 To 47
  CodeE(i) = R7(E(i))  '经过E变换扩充,由32位变为48位
  CodeE(i) = CodeE(i) Xor K9(i)  '与K9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L8,R8
  R8(i) = L7(i) Xor CodeP(i)
  L8(i) = R7(i)
  Next
 
 
 
  '进行第9次迭代
  For i = 0 To 47
  CodeE(i) = R8(E(i))  '经过E变换扩充,由32位变为48位
  CodeE(i) = CodeE(i) Xor K8(i)  '与K8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L9,R9
  R9(i) = L8(i) Xor CodeP(i)
  L9(i) = R8(i)
  Next
 
 
 
  '进行第10次迭代
  For i = 0 To 47
  CodeE(i) = R9(E(i))  '经过E变换扩充,由32位变为48位
  CodeE(i) = CodeE(i) Xor K7(i)  '与K7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L10,R10
  R10(i) = L9(i) Xor CodeP(i)
  L10(i) = R9(i)
  Next
 
 
 
  '进行第11次迭代
  For i = 0 To 47
  CodeE(i) = R10(E(i))  '经过E变换扩充,由32位变为48位
  CodeE(i) = CodeE(i) Xor K6(i)  '与K6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 K5(i)  '与K5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 K4(i)  '与K4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 K3(i)  '与K3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 K2(i)  '与K2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 K1(i)  '与K1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L11,R11
  R16(i) = L15(i) Xor CodeP(i)
  L16(i) = R15(i)
  Next
 
  For i = 0 To 31
  BinCode(i) = R16(i)
  BinCode(i + 32) = L16(i)
  Next
 
  For i = 0 To 63
  CodeIP(i) = BinCode(IP_1(i))
  Next
 
  For i = 0 To 7
  tempReturn(i) = CodeIP(i * 8 + 0) * &H80
  tempReturn(i) = tempReturn(i) + CodeIP(i * 8 + 1) * &H40
  tempReturn(i) = tempReturn(i) + CodeIP(i * 8 + 2) * &H20
  tempReturn(i) = tempReturn(i) + CodeIP(i * 8 + 3) * &H10
  tempReturn(i) = tempReturn(i) + CodeIP(i * 8 + 4) * &H8
  tempReturn(i) = tempReturn(i) + CodeIP(i * 8 + 5) * &H4
  tempReturn(i) = tempReturn(i) + CodeIP(i * 8 + 6) * &H2
  tempReturn(i) = tempReturn(i) + CodeIP(i * 8 + 7) * &H1
  Next

  CopyMemory bReturn(j), tempReturn(0), 8
Next


End Sub

谨已这篇文章送给和我一样在VB中苦苦挣扎的兄弟们!!


来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/10752019/viewspace-984527/,如需转载,请注明出处,否则将追究法律责任。

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