ASP exampleΒΆ

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<%
    'Suppose you have already asked user to authenticate himself through a login form
    'The following is the action part of the login form
	
    'CHANGE THEM:
	secret = "YOUR_SHARED_SECRET"
	username = "USER_NAME";
    email = "USER_EMAIL";
    site = "YOUR_SITE_NAME";
	displayName = ""; 'optional
	phone = ""; 'optional
	organization = ""; 'optional
    'END OF CHANGE THEM


	hash = SHA256($secret."@@" & username & "@@" & email)
	parameters = "username=" & username & "&email=" & email

	' optional parameters
	parameters &= "&displayName=" & displayName & "&phone=" & phone & "&organization=" & organization

	parameters = Base64_encode(parameters)

	redirectURL = "http://www.ihelpdesk.com/desktop/SsoServlet.hd?c=" & site & "&";
	redirectURL &= "&parameters=" & parameters & "&hash=" & hash

	if not isempty(Request.QueryString("continue")) then
	    redirectURL &= "&continue=" & Server.URLEncode(Request.QueryString("continue"))
	end if

	Response.redirect(redirectURL)

	Dim Base64Chars
	Base64Chars =	"ABCDEFGHIJKLMNOPQRSTUVWXYZ" & _
			"abcdefghijklmnopqrstuvwxyz" & _
			"0123456789" & _
			"+/"


	' Functions for encoding string to Base64
	Public Function base64_encode( byVal strIn )
		Dim c1, c2, c3, w1, w2, w3, w4, n, strOut
		For n = 1 To Len( strIn ) Step 3
			c1 = Asc( Mid( strIn, n, 1 ) )
			c2 = Asc( Mid( strIn, n + 1, 1 ) + Chr(0) )
			c3 = Asc( Mid( strIn, n + 2, 1 ) + Chr(0) )
			w1 = Int( c1 / 4 ) : w2 = ( c1 And 3 ) * 16 + Int( c2 / 16 )
			If Len( strIn ) >= n + 1 Then 
				w3 = ( c2 And 15 ) * 4 + Int( c3 / 64 ) 
			Else 
				w3 = -1
			End If
			If Len( strIn ) >= n + 2 Then 
				w4 = c3 And 63 
			Else 
				w4 = -1
			End If
			strOut = strOut + mimeencode( w1 ) + mimeencode( w2 ) + _
					  mimeencode( w3 ) + mimeencode( w4 )
		Next
		base64_encode = strOut
	End Function

	Private Function mimeencode( byVal intIn )
		If intIn >= 0 Then 
			mimeencode = Mid( Base64Chars, intIn + 1, 1 ) 
		Else 
			mimeencode = ""
		End If
	End Function	


	' Function to decode string from Base64
	Public Function base64_decode( byVal strIn )
		Dim w1, w2, w3, w4, n, strOut
		For n = 1 To Len( strIn ) Step 4
			w1 = mimedecode( Mid( strIn, n, 1 ) )
			w2 = mimedecode( Mid( strIn, n + 1, 1 ) )
			w3 = mimedecode( Mid( strIn, n + 2, 1 ) )
			w4 = mimedecode( Mid( strIn, n + 3, 1 ) )
			If w2 >= 0 Then _
				strOut = strOut + _
					Chr( ( ( w1 * 4 + Int( w2 / 16 ) ) And 255 ) )
			If w3 >= 0 Then _
				strOut = strOut + _
					Chr( ( ( w2 * 16 + Int( w3 / 4 ) ) And 255 ) )
			If w4 >= 0 Then _
				strOut = strOut + _
					Chr( ( ( w3 * 64 + w4 ) And 255 ) )
		Next
		base64_decode = strOut
	End Function

	Private Function mimedecode( byVal strIn )
		If Len( strIn ) = 0 Then 
			mimedecode = -1 : Exit Function
		Else
			mimedecode = InStr( Base64Chars, strIn ) - 1
		End If
	End Function

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     
    Dim   lY4     
    Dim   lX8     
    Dim   lY8     
    Dim   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     
    Dim   lNumberOfWords     
    Dim   lWordArray()     
    Dim   lBytePosition     
    Dim   lByteCount     
    Dim   lWordCount     
    Dim   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)     
    Dim   M     
    Dim   W(63)     
    Dim   a     
    Dim   b     
    Dim   c     
    Dim   d     
    Dim   e     
    Dim   f     
    Dim   g     
    Dim   h     
    Dim   i     
    Dim   j     
    Dim   T1     
    Dim   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 
%>