Next
C16(27) = C15(0)
D16(27) = D15(0)

'組合C16,D16成C_D
For i = 0 To 27
    C_D(i) = C16(i)
    C_D(i + 28) = D16(i)
Next

'PC_2轉換,生成K16
For i = 0 To 47
    K16(i) = C_D(PC_2(i))
Next

'**************************************************************************************

'將明文位數擴展為8的倍數
If (UBound(sCode) + 1) Mod 8 > 0 Then ReDim Preserve sCode(((UBound(sCode) + 1) \ 8 + 1) * 8 - 1)
'定義返回密文長度
ReDim bReturn(UBound(sCode))

For j = 0 To UBound(sCode) Step 8
    '加密過程
    '依次取8位加密
    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置換
    For i = 0 To 63
        CodeIP(i) = BinCode(IP(i))
    Next
    
    '分段
    For i = 0 To 31
        L0(i) = CodeIP(i)
        R0(i) = CodeIP(i + 32)
    Next
    
    '進行第一次迭代
    For i = 0 To 47
        CodeE(i) = R0(E(i))                 '經過E變換擴充，由32位變為48位
        CodeE(i) = CodeE(i) Xor K1(i)        '與K1按位作不進位加法運算
    Next
    
    '分8組
    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盒運算，得到8個數
    
        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盒運算32位結果
    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變換
        CodeP(i) = RetS(P(i))
        
        '產生L1,R1
        R1(i) = L0(i) Xor CodeP(i)
        L1(i) = R0(i)
    Next
    
    
    '進行第二次迭代
    For i = 0 To 47
        CodeE(i) = R1(E(i))                 '經過E變換擴充，由32位變為48位
        CodeE(i) = CodeE(i) Xor K2(i)        '與K2按位作不進位加法運算
    Next
    
    '分8組
    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盒運算，得到8個數
    
        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盒運算32位結果
    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變換
        CodeP(i) = RetS(P(i))
        
        '產生L2,R2
        R2(i) = L1(i) Xor CodeP(i)
        L2(i) = R1(i)
    Next
    
    '進行第三次迭代
    For i = 0 To 47
        CodeE(i) = R2(E(i))                 '經過E變換擴充，由32位變為48位
        CodeE(i) = CodeE(i) Xor K3(i)        '與K3按位作不進位加法運算
    Next
    
    '分8組
    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盒運算，得到8個數
    
        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盒運算32位結果
    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變換
        CodeP(i) = RetS(P(i))
        
        '產生L3,R3
        R3(i) = L2(i) Xor CodeP(i)
        L3(i) = R2(i)
    Next
    
    
    '進行第四次迭代
    For i = 0 To 47
        CodeE(i) = R3(E(i))                 '經過E變換擴充，由32位變為48位
        CodeE(i) = CodeE(i) Xor K4(i)        '與K4按位作不進位加法運算
    Next
    
    '分8組
    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盒運算，得到8個數
    
        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盒運算32位結果
    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變換
        CodeP(i) = RetS(P(i))
        
        '產生L4,R4
        R4(i) = L3(i) Xor CodeP(i)
        L4(i) = R3(i)
    Next
    
    
    '進行第五次迭代
    For i = 0 To 47
        CodeE(i) = R4(E(i))                 '經過E變換擴充，由32位變為48位
        CodeE(i) = CodeE(i) Xor K5(i)        '與K5按位作不進位加法運算
    Next
    
    '分8組
    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盒運算，得到8個數
    
        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盒運算32位結果
    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變換
        CodeP(i) = RetS(P(i))
        
        '產生L5,R5
        R5(i) = L4(i) Xor CodeP(i)
        L5(i) = R4(i)
    Next
    
    
    
    '進行第六次迭代
    For i = 0 To 47
        CodeE(i) = R5(E(i))                 '經過E變換擴充，由32位變為48位
        CodeE(i) = CodeE(i) Xor K6(i)        '與K6按位作不進位加法運算
    Next
    
    '分8組
    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盒運算，得到8個數
    
        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盒運算32位結果
    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變換
        CodeP(i) = RetS(P(i))
        
        '產生L6,R6
        R6(i) = L5(i) Xor CodeP(i)
        L6(i) = R5(i)
    Next
    
    
    
    '進行第7次迭代
    For i = 0 To 47
        CodeE(i) = R6(E(i))                 '經過E變換擴充，由32位變為48位
        CodeE(i) = CodeE(i) Xor K7(i)        '與K7按位作不進位加法運算
    Next
    
    '分8組
    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盒運算，得到8個數
    
        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盒運算32位結果
    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變換
        CodeP(i) = RetS(P(i))
        
        '產生L7,R7
        R7(i) = L6(i) Xor CodeP(i)
        L7(i) = R6(i)
    Next
    
    
    
    '進行第8次迭代
    For i = 0 To 47
        CodeE(i) = R7(E(i))                 '經過E變換擴充，由32位變為48位
        CodeE(i) = CodeE(i) Xor K8(i)        '與K8按位作不進位加法運算
    Next
    
    '分8組
    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盒運算，得到8個數
    
        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盒運算32位結果
    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