发表新帖
发表新帖

HMAC Algorithm (SHA256) in Classic ASP VBScript

前端 未结
关注
3 1385
醉话见心
醉话见心 2021-01-20 15:55

I\'m trying to write an HMAC function in Classic ASP using SHA256 as the hash. I thought I got it right, but the results aren\'t the same for the examples listed on the Wiki

相关标签:
3条回答
  • 日久生厌
    2021-01-20 16:29

    A long time ago I used this SHA256 construction. I think you can still use it in your classic asp pages, save code as asp file and do a virtual include in your page. You can use SHA256(string) to encrypt given string to a 64 char length like this: 6eea044931e914308aab890967338b2fe7e88de181a27e704c284d2b39580284.

    To make it more robust you could add the rowid or timestamp plus password when you insert it into the database. This way it also needs to compare RowID+PASS or RowID+TimeStamp+PASS to the hash.

    I have used this for many years without any problem. It is not the fastest and best written script but it works.

    Private m_lOnBits(30)
Private m_l2Power(30)
Private K(63)

Private Const BITS_TO_A_BYTE = 8
Private Const BYTES_TO_A_WORD = 4
Private Const BITS_TO_A_WORD = 32

m_lOnBits(0) = CLng(1)
m_lOnBits(1) = CLng(3)
m_lOnBits(2) = CLng(7)
m_lOnBits(3) = CLng(15)
m_lOnBits(4) = CLng(31)
m_lOnBits(5) = CLng(63)
m_lOnBits(6) = CLng(127)
m_lOnBits(7) = CLng(255)
m_lOnBits(8) = CLng(511)
m_lOnBits(9) = CLng(1023)
m_lOnBits(10) = CLng(2047)
m_lOnBits(11) = CLng(4095)
m_lOnBits(12) = CLng(8191)
m_lOnBits(13) = CLng(16383)
m_lOnBits(14) = CLng(32767)
m_lOnBits(15) = CLng(65535)
m_lOnBits(16) = CLng(131071)
m_lOnBits(17) = CLng(262143)
m_lOnBits(18) = CLng(524287)
m_lOnBits(19) = CLng(1048575)
m_lOnBits(20) = CLng(2097151)
m_lOnBits(21) = CLng(4194303)
m_lOnBits(22) = CLng(8388607)
m_lOnBits(23) = CLng(16777215)
m_lOnBits(24) = CLng(33554431)
m_lOnBits(25) = CLng(67108863)
m_lOnBits(26) = CLng(134217727)
m_lOnBits(27) = CLng(268435455)
m_lOnBits(28) = CLng(536870911)
m_lOnBits(29) = CLng(1073741823)
m_lOnBits(30) = CLng(2147483647)

m_l2Power(0) = CLng(1)
m_l2Power(1) = CLng(2)
m_l2Power(2) = CLng(4)
m_l2Power(3) = CLng(8)
m_l2Power(4) = CLng(16)
m_l2Power(5) = CLng(32)
m_l2Power(6) = CLng(64)
m_l2Power(7) = CLng(128)
m_l2Power(8) = CLng(256)
m_l2Power(9) = CLng(512)
m_l2Power(10) = CLng(1024)
m_l2Power(11) = CLng(2048)
m_l2Power(12) = CLng(4096)
m_l2Power(13) = CLng(8192)
m_l2Power(14) = CLng(16384)
m_l2Power(15) = CLng(32768)
m_l2Power(16) = CLng(65536)
m_l2Power(17) = CLng(131072)
m_l2Power(18) = CLng(262144)
m_l2Power(19) = CLng(524288)
m_l2Power(20) = CLng(1048576)
m_l2Power(21) = CLng(2097152)
m_l2Power(22) = CLng(4194304)
m_l2Power(23) = CLng(8388608)
m_l2Power(24) = CLng(16777216)
m_l2Power(25) = CLng(33554432)
m_l2Power(26) = CLng(67108864)
m_l2Power(27) = CLng(134217728)
m_l2Power(28) = CLng(268435456)
m_l2Power(29) = CLng(536870912)
m_l2Power(30) = CLng(1073741824)

K(0) = &H428A2F98
K(1) = &H71374491
K(2) = &HB5C0FBCF
K(3) = &HE9B5DBA5
K(4) = &H3956C25B
K(5) = &H59F111F1
K(6) = &H923F82A4
K(7) = &HAB1C5ED5
K(8) = &HD807AA98
K(9) = &H12835B01
K(10) = &H243185BE
K(11) = &H550C7DC3
K(12) = &H72BE5D74
K(13) = &H80DEB1FE
K(14) = &H9BDC06A7
K(15) = &HC19BF174
K(16) = &HE49B69C1
K(17) = &HEFBE4786
K(18) = &HFC19DC6
K(19) = &H240CA1CC
K(20) = &H2DE92C6F
K(21) = &H4A7484AA
K(22) = &H5CB0A9DC
K(23) = &H76F988DA
K(24) = &H983E5152
K(25) = &HA831C66D
K(26) = &HB00327C8
K(27) = &HBF597FC7
K(28) = &HC6E00BF3
K(29) = &HD5A79147
K(30) = &H6CA6351
K(31) = &H14292967
K(32) = &H27B70A85
K(33) = &H2E1B2138
K(34) = &H4D2C6DFC
K(35) = &H53380D13
K(36) = &H650A7354
K(37) = &H766A0ABB
K(38) = &H81C2C92E
K(39) = &H92722C85
K(40) = &HA2BFE8A1
K(41) = &HA81A664B
K(42) = &HC24B8B70
K(43) = &HC76C51A3
K(44) = &HD192E819
K(45) = &HD6990624
K(46) = &HF40E3585
K(47) = &H106AA070
K(48) = &H19A4C116
K(49) = &H1E376C08
K(50) = &H2748774C
K(51) = &H34B0BCB5
K(52) = &H391C0CB3
K(53) = &H4ED8AA4A
K(54) = &H5B9CCA4F
K(55) = &H682E6FF3
K(56) = &H748F82EE
K(57) = &H78A5636F
K(58) = &H84C87814
K(59) = &H8CC70208
K(60) = &H90BEFFFA
K(61) = &HA4506CEB
K(62) = &HBEF9A3F7
K(63) = &HC67178F2

Private Function LShift(lValue, iShiftBits)
    If iShiftBits = 0 Then
       LShift = lValue
       Exit Function
    ElseIf iShiftBits = 31 Then
        If lValue And 1 Then
            LShift = &H80000000
        Else
            LShift = 0
        End If
        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(lValue, iShiftBits)
    If iShiftBits = 0 Then
        RShift = lValue
        Exit Function
    ElseIf iShiftBits = 31 Then
        If lValue And &H80000000 Then
            RShift = 1
        Else
            RShift = 0
        End If
        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 If
End Function

Private Function AddUnsigned(lX, lY)
    Dim lX4, lY4, lX8, lY8, lResult

    lX8 = lX And &H80000000
    lY8 = lY And &H80000000
    lX4 = lX And &H40000000
    lY4 = lY And &H40000000

    lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)

    If lX4 And lY4 Then
        lResult = lResult Xor &H80000000 Xor lX8 Xor lY8
    ElseIf lX4 Or lY4 Then
        If lResult And &H40000000 Then
            lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8
        Else
            lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
        End If
    Else
        lResult = lResult Xor lX8 Xor lY8
    End If

    AddUnsigned = lResult
End Function

Private Function Ch(x, y, z)
    Ch = ((x And y) Xor ((Not x) And z))
End Function

Private Function Maj(x, y, z)
    Maj = ((x And y) Xor (x And z) Xor (y And z))
End Function

Private Function S(x, n)
    S = (RShift(x, (n And m_lOnBits(4))) Or LShift(x, (32 - (n And   m_lOnBits(4)))))
End Function

Private Function R(x, n)
    R = RShift(x, cLng(n And m_lOnBits(4)))
End Function

Private Function Sigma0(x)
    Sigma0 = (S(x, 2) Xor S(x, 13) Xor S(x, 22))
End Function

Private Function Sigma1(x)
    Sigma1 = (S(x, 6) Xor S(x, 11) Xor S(x, 25))
End Function

Private Function Gamma0(x)
    Gamma0 = (S(x, 7) Xor S(x, 18) Xor R(x, 3))
End Function

Private Function Gamma1(x)
    Gamma1 = (S(x, 17) Xor S(x, 19) Xor R(x, 10))
End Function

Private Function ConvertToWordArray(sMessage)
    Dim lMessageLength, lNumberOfWords, lWordArray(), lBytePosition, lByteCount, lWordCount, lByte

    Const MODULUS_BITS = 512
    Const CONGRUENT_BITS = 448

    lMessageLength = Len(sMessage)

    lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)
    ReDim lWordArray(lNumberOfWords - 1)

    lBytePosition = 0
    lByteCount = 0
    Do Until lByteCount >= lMessageLength
        lWordCount = lByteCount \ BYTES_TO_A_WORD

        lBytePosition = (3 - (lByteCount Mod BYTES_TO_A_WORD)) * BITS_TO_A_BYTE

        lByte = AscB(Mid(sMessage, lByteCount + 1, 1))

        lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(lByte, lBytePosition)
        lByteCount = lByteCount + 1
    Loop

    lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (3 - (lByteCount Mod BYTES_TO_A_WORD)) * BITS_TO_A_BYTE

    lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)

    lWordArray(lNumberOfWords - 1) = LShift(lMessageLength, 3)
    lWordArray(lNumberOfWords - 2) = RShift(lMessageLength, 29)

    ConvertToWordArray = lWordArray
End Function

Public Function SHA256(sMessage)
    Dim HASH(7), M, W(63), a, b, c, d, e, f, g, h, i, j, T1, T2

    HASH(0) = &H6A09E667
    HASH(1) = &HBB67AE85
    HASH(2) = &H3C6EF372
    HASH(3) = &HA54FF53A
    HASH(4) = &H510E527F
    HASH(5) = &H9B05688C
    HASH(6) = &H1F83D9AB
    HASH(7) = &H5BE0CD19

    M = ConvertToWordArray(sMessage)

    For i = 0 To UBound(M) Step 16
        a = HASH(0)
        b = HASH(1)
        c = HASH(2)
        d = HASH(3)
        e = HASH(4)
        f = HASH(5)
        g = HASH(6)
        h = HASH(7)

        For j = 0 To 63
           If j < 16 Then
              W(j) = M(j + i)
           Else
               W(j) = AddUnsigned(AddUnsigned(AddUnsigned(Gamma1(W(j - 2)), W(j - 7)), Gamma0(W(j - 15))), W(j - 16))
           End If

           T1 = AddUnsigned(AddUnsigned(AddUnsigned(AddUnsigned(h, Sigma1(e)), Ch(e, f, g)), K(j)), W(j))
           T2 = AddUnsigned(Sigma0(a), Maj(a, b, c))

           h = g
           g = f
           f = e
           e = AddUnsigned(d, T1)
           d = c
           c = b
           b = a
           a = AddUnsigned(T1, T2)
        Next

        HASH(0) = AddUnsigned(a, HASH(0))
        HASH(1) = AddUnsigned(b, HASH(1))
        HASH(2) = AddUnsigned(c, HASH(2))
        HASH(3) = AddUnsigned(d, HASH(3))
        HASH(4) = AddUnsigned(e, HASH(4))
        HASH(5) = AddUnsigned(f, HASH(5))
        HASH(6) = AddUnsigned(g, HASH(6))
        HASH(7) = AddUnsigned(h, HASH(7))
     Next

     SHA256 = LCase(Right("00000000" & Hex(HASH(0)), 8) & Right("00000000" & Hex(HASH(1)), 8) & Right("00000000" & Hex(HASH(2)), 8) & Right("00000000" & Hex(HASH(3)), 8) & Right("00000000" & Hex(HASH(4)), 8) & Right("00000000" & Hex(HASH(5)), 8) & Right("00000000" & Hex(HASH(6)), 8) & Right("00000000" & Hex(HASH(7)), 8))
End Function
    0 讨论(0)
  • 悲&欢浪女
    2021-01-20 16:42

    Well, I once implemented TEA (tiny encryption algorithm) in classic ASP and had similar problems. In my case, the root cause was, that ASP saves the strings you are concatenating (& char) again as UTF-16 and so the offsets did not always match up where I expected them.

    I don't know if this applies to your use case, since I had to work with UTF-8 special characters.

    My solution was to work with an array of longs, that I could target properly with my binary functions. Here are the functions to work with this array, hoping they are helpful for you. 

        '*******************************************************************************
    ' getArrayFromInputString (FUNCTION)
    '
    ' PARAMETERS:
    ' (In) - s_source - Source string (format is defined by n_options)
    ' (In) - n_blocksize - Blocksize, which is corrected by padding
    ' (In) - n_options - Options using follobing bits:
    '        1: string is in HEX format (e.g. DFD14DAFD9C555C07FEB8F3DA90DEA27)

    ' RETURN VALUE:
    ' long array
    '
    ' DESCRIPTION:
    ' allows to import strings in various formats for all input functions
    '*******************************************************************************
    private function getArrayFromInputString(s_source, n_blocksize, n_options)
        ' n_options:

        dim a_out, s_padded_string

        if (n_options AND 1) = 1 then
            s_padded_string = padString(s_source, n_blocksize * 2, "0")
            a_out = convertHexStringToArray(s_padded_string)
        else
            if b_unicode_ then
                s_padded_string = padString(s_source, int(n_blocksize / 2), " ")
                a_out = convertStringToArray_Unicode(s_padded_string)
            else    
                s_padded_string = padString(s_source, n_blocksize, " ")
                a_out = convertStringToArray(s_padded_string)
            end if
        end if

        getArrayFromInputString = a_out
    end function


    '*******************************************************************************
    ' convertStringToArray (FUNCTION)
    '
    ' PARAMETERS:
    ' (In) - s_source - Source string to build the array from
    '                   length MUST be in multiples of 4!
    '
    ' RETURN VALUE:
    ' Array of type Long - Length is 4 times smaller than the string length
    '
    ' DESCRIPTION:
    ' Blocks of four characters are calculated into one Long entry of the result array
    '*******************************************************************************
    private function convertStringToArray(s_source) ' returns long array
        dim a_out, n_index, n_length, n_temp
        dim n_array_index, n_nibble

        n_length = len(s_source)
        redim a_out(int(n_length / 4))

        for n_index=0 to n_length - 1
            n_temp = asc(mid(s_source, n_index + 1, 1))
            n_array_index = int(n_index / 4)
            n_nibble = n_index MOD 4

            a_out(n_array_index) = AddUnsigned(a_out(n_array_index), LShift(n_temp, (3 - n_nibble) * 8))
        next
        convertStringToArray = a_out
    end function

    '*******************************************************************************
    ' convertHexStringToArray (unicode version)
    private function convertStringToArray_Unicode(s_source) ' returns long array
        dim a_out, n_index, n_length, n_temp
        dim n_array_index, n_nibble

        n_length = len(s_source)
        redim a_out(int(n_length / 2))

        for n_index=0 to n_length - 1
            n_temp = ascw(mid(s_source, n_index + 1, 1))

            n_array_index = int(n_index / 2)
            n_nibble = (n_index MOD 2)

            a_out(n_array_index) = AddUnsigned(a_out(n_array_index), LShift(n_temp, (1 - n_nibble) * 16))
        next
        convertStringToArray_Unicode = a_out
    end function

    '*******************************************************************************
    ' convertHexStringToArray (FUNCTION)
    '
    ' PARAMETERS:
    ' (In) - s_source - Source string in hex format, e.g. "EFCE016503CDDB53"
    '                   length MUST be in multiples of 8!
    '
    ' RETURN VALUE:
    ' Array of type Long - Length is 8 times smaller than the string length
    '
    ' DESCRIPTION:
    ' Blocks of eight characters are calculated into one Long entry of the result array
    '*******************************************************************************
    private function convertHexStringToArray(s_source) ' returns long array
        dim a_out, n_index, n_length, n_temp
        dim n_array_index, n_nibble

        n_length = len(s_source)
        redim a_out(int(n_length / 8))

        for n_index=0 to n_length - 1 step 2
            n_temp = CInt("&H" & mid(s_source, n_index + 1, 2))
            n_array_index = int(n_index / 8)
            n_nibble = int((n_index MOD 8) / 2)

            a_out(n_array_index) = AddUnsigned(a_out(n_array_index), LShift(n_temp, (3 - n_nibble) * 8))
        next
        convertHexStringToArray = a_out
    end function


    '*******************************************************************************
    ' padString (FUNCTION)
    '
    ' PARAMETERS:
    ' (In) - s_source
    ' (In) - n_blocksize
    ' (In) - s_padding_char
    '
    ' RETURN VALUE:
    ' String - padded source string
    '
    ' DESCRIPTION:
    ' ensure, that the plaintext is multiples of n_blocksize bytes long, the needed amount of s_padding_char is applied
    '*******************************************************************************
    private function padString(s_source, n_blocksize, s_padding_char)
        dim s_out, n_length, n_padding, n_index

        s_out = s_source
        n_length = len(s_source)
        if n_length MOD n_blocksize>0 then
            n_padding = n_blocksize - n_length MOD n_blocksize
            for n_index=1 to n_padding
                s_out = s_out & left(s_padding_char, 1)
            next
        end if

        padString = s_out
    end function

    '*******************************************************************************
    ' printArray (FUNCTION)
    '
    ' PARAMETERS:
    ' (In) - s_prefix - just a string to be written in front for distinction of multiple arrays
    ' (In) - a_data - long array to print out
    '
    ' RETURN VALUE:
    ' none
    '
    ' DESCRIPTION:
    ' debug output function
    '*******************************************************************************
    private function printArray(s_prefix, a_data)
        dim n_index
        for n_index=0 to UBound(a_data) - 1
            Response.Write "<p>" & s_prefix & a_data(n_index) & " - " & getHex(a_data(n_index)) & "</p>" & vbNewline
        next
    end function

    '*******************************************************************************
    ' Some more little helper functions
    '*******************************************************************************
    private function getHex(n_value)
        getHex = Right("00000000" & Hex(n_value), 8)
    end function

    private function getStringFromLong(n_value)
        getStringFromLong = _
            Chr(RShift(n_value, 24) AND &HFF) & _
            Chr(RShift(n_value, 16) AND &HFF) & _
            Chr(RShift(n_value, 8) AND &HFF) & _
            Chr(n_value AND &HFF)
    end function

    private function getStringFromLong_Unicode(n_value)
        dim s_temp

        s_temp = getHex(n_value)
        getStringFromLong_Unicode = _
            ChrW(int("&H" & mid(s_temp, 1, 4))) & _
            ChrW(int("&H" & mid(s_temp, 5, 4)))
    end function
    0 讨论(0)
  • 面向向阳花
    2021-01-20 16:43

    The issue is because VBScript String is not a bytearray, so when you concat chr(0) you are adding 2 0 bytes to string.

    Anyway VBScript is a nighmare for managing bytes and words, so I suggest you use a crypt javascript API that we have wrapped for ASP VBScript use.

    You could get more details, and our contact info in this repository: https://github.com/ictmanagement/redsysHMAC256_API_ASP

    A complete example:

    <!-- #include file="./dvim_brix_crypto-js-master_VB.asp" -->

'/******  MAC Function ******/
'Input String|WordArray , Returns WordArray
Function mac256(ent, key) 
    Dim encWA
    Set encWA = ConvertUtf8StrToWordArray(ent)
    Dim keyWA
    Set keyWA = ConvertUtf8StrToWordArray(key)
    Dim resWA
    Set resWA = CryptoJS.HmacSHA256(encWA, keyWA)
    Set mac256 = resWA
End Function

'Input (Utf8)String|WordArray Returns WordArray
Function ConvertUtf8StrToWordArray(data)
    If (typename(data) = "String") Then
        Set ConvertUtf8StrToWordArray = CryptoJS.enc.Utf8.parse(data)
    Elseif (typename(data) = "JScriptTypeInfo") Then
        On error resume next
        'Set ConvertUtf8StrToWordArray = CryptoJS.enc.Utf8.parse(data.toString(CryptoJS.enc.Utf8)) 
        Set ConvertUtf8StrToWordArray = CryptoJS.lib.WordArray.create().concat(data) 'Just assert that data is WordArray
        If Err.number>0 Then
            Set ConvertUtf8StrToWordArray = Nothing
        End if
        On error goto 0
    Else
        Set ConvertUtf8StrToWordArray = Nothing
    End if
End Function

Dim test
test = "Hi guys"
key = "guyb u oisd qiu dqid qew" 'You could create a WordArray from Hex String, Utf8 String, etc.
Dim res
res = mac256(test,key) 'Result is a WordArray, so
Response.Write res.toString(CryptoJS.enc.Hex)
    0 讨论(0)
 看不清?
提交回复
热议问题