This article has two files composition
Test.asp test presentation
CLSRSA.ASP implements RSA encryption and decryption VBS class files
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Test.asp
<% REM Title: RSA Encryption and Decryption REM Collection Claims in ASP: YANEKREM Contact: AspBoy@263.net
%> <% OPTION Explicit%> <%
Dim LngKeyedim LngKeyddim LngKeyndim Strimedim objrsaif Not request.form = "" THEN
LNGKEYE = Request.form ("Keye") LNGKEYD = Request.form ("keyd") LNGKEYN = Request.form ("keyn") STRMESSAGE = Request.form ("Message" set objrsa = new clsrslectorct case request.form ( "Action") Case "Generate Keys" Call ObjRSA.GenKey () LngKeyE = ObjRSA.PublicKeyLngKeyD = ObjRSA.PrivateKeyLngKeyN = ObjRSA.ModulusCase "Encrypt" ObjRSA.PublicKey = LngKeyEObjRSA.Modulus = LngKeyNStrMessage = ObjRSA.Encode (strMessage) Case "Decrypt "ObjRSA.PrivateKey = LngKeyDObjRSA.Modulus = LngKeyNStrMessage = ObjRSA.Decode (strMessage) End SelectSet ObjRSA = NothingEnd If%>
RSA Cipher Demonstration </ TITLE> </ HEAD> <BODY> <H1 > RSA Cipher Demonstration </ h1> <p> You will first need to generate your public / privage key-pairbefore you can encrypt / decrypt message. </ P> <form method = "post"> <table> <tr> < TD> Public Key </ TD> <TD> <input name = "key" value = "<% = server.htmlencode (lngKeye)%>> </ td> <td rowspan =" 3 "> <input type = "Submit" name = "action" value = "generate keys"> </ td> </ tr> <tr> <td> private key </ td> <TD> <input name = "keyd" VALUE = "<% = Server.htmlencode (lngKeyd)%>> </ td> </ tr> <tr> <TD> MODULUS </ TD> <TD> <input name =" key "value =" <% = Server.htmlencode (LNGKEYN)%>> </ td> </ tr> <TR> <TD colspan = "3"> test message: <br> <textarea name = "message"</p>
<p>COLS = "50" rows = "7"> <% = server.htmlencode (strmessage)%> </ textarea> </ td> </ tr> <tr> <td align = "right" colspan = "3"> <Input Type = "Submit" name = "action" value = "encrypt"> <input type = "submit" name = "action" value = "decrypt"> </ td> </ tr> </ TABLE> </ Form> </ body> </ html> CLSRSA.ASP</p>
<p><% REM implementation RSA encryption and decryption VBS class file REM article Title: RSA encryption and decryption RSA encryption in ASP: YANEKREM Contact: AspBoy@263.net</p>
<p>'RSA Encryption Class'' .PrivateKey 'Your personal private key. Keep this hidden.' '.PublicKey' Key for others to encrypt data with. '' .Modulus' Used with both public and private keys when encrypting 'and decrypting data. '' .GenKey () 'Creates Public / Private key set and Modulus' '.Crypt (pLngMessage, pLngKey)' encrypts / Decrypts message and returns 'as a string.' '.Encode (pStrMessage)' encrypts message and returns in double -HEX format '' .decode (pstrMessage) 'Decrypts Message from Double-HEX Format and Returns A String'class CLSRSA</p>
<p>Public PrivateKeypublic Public Public Private MODULUSPUBLIC SUB GENKEY () DIM LLNGPHIDIM QDIM P</p>
<p>Randomize</p>
<p>DODO</p>
<p>'2 Random Primary NumBers (0 to 1000) DOP = RND * 1000 / 1LOOP while not isprime (p) DOQ = RND * 1000 / 1LOOP while not isprime (q)</p>
<p>'n = product of 2 primesmodulus = p * q / 1' Random Decryptor (2 to n) privateKey = rND * (MODULUS - 2) / 1 2llNGphi = (P - 1) * (Q - 1) / 1PublicKey = Euler (LLNGPHI, PRIVATEKEY)</p>
<p>Loop while publickey = 0 or publickey = 1</p>
<p>'Loop if we can't crypt / decrypt a byte loop while not testcrypt (255) End Sub</p>
<p>Private function testcrypt (byref pbytdata) DIM LSTRCRYPTEDLSTRCRYPTED = CRYPT (PBYTDATA, PUBLICKEY) TESTCRYPT = Crypt (lstrcrypted, privatekey) = PBYTDATAEND FUNCTION</p>
<p>Private function euler (byref plngphi, byref plngkey)</p>
<p>DIM LLNGR (3) DIM LLNGP (3) DIM LLNGQ (3)</p>
<p>DIM LLNGCOUNTERDIM LLNGRESulTeuler = 0</p>
<p>LLNGR (1) = PLNGPHI: LLNGR (0) = PLNGKEYLLNGP (1) = 0: llngp (0) = 1LLngq (1) = 2: LLNGQ (0) = 0</p>
<p>LLNGCOUNTER = -1</p>
<p>Do Until LLNGR (0) = 0</p>
<p>LLNGR (2) = LLNGR (1): llngr (1) = llngr (0) LLNGP (2) = llngp (1): llngp (1) = llngp (0) LLNGQ (2) = llngq (1): llngq 1) = llngq (0) LLNGCOUNTER = LLNGCOUNTER 1</p>
<p>LLNGR (0) = LLNGR (2) MOD LLNGR (1) LLNGP (0) = ((LLNGR (2) / LLNGR (1)) * LLNGP (1)) LLNGP (2) LLNGQ (0) = ((LLNGR) (2) / llngr (1)) * LLNGQ (1)) LLNGQ (2)</p>
<p>Loop</p>
<p>LLNGRESULT = (PLNGKEY * LLNGP (1)) - (PLNGPHI * LLNGQ (1))</p>
<p>IF llngresult> 0 theneuler = llngp (1) elseeuler = abs (llngp (1)) PLNGPHIEND IF</p>
<p>End FunctionPublic Function Crypt (pLngMessage, pLngKey) On Error Resume NextDim lLngModDim lLngResultDim lLngIndexIf pLngKey Mod 2 = 0 ThenlLngResult = 1For lLngIndex = 1 To pLngKey / 2lLngMod = (pLngMessage ^ 2) Mod Modulus' Mod may error on key generationlLngResult = (lLngMod * lLngResult) Mod Modulus If Err Then Exit FunctionNextElselLngResult = pLngMessageFor lLngIndex = 1 To pLngKey / 2lLngMod = (pLngMessage ^ 2) Mod ModulusOn error Resume Next 'Mod may error on key generationlLngResult = (lLngMod * lLngResult) Mod ModulusIf Err Then Exit FunctionNextEnd IfCrypt = LLNGRESultend Function</p>
<p>Private Function IsPrime (ByRef pLngNumber) Dim lLngSquareDim lLngIndexIsPrime = FalseIf pLngNumber <2 Then Exit FunctionIf pLngNumber Mod 2 = 0 Then Exit FunctionlLngSquare = Sqr (pLngNumber) For lLngIndex = 3 To lLngSquare Step 2If pLngNumber Mod lLngIndex = 0 Then Exit FunctionNextIsPrime = TrueEnd FunctionPublic Function Encode (ByVal pStrMessage) Dim lLngIndexDim lLngMaxIndexDim lBytAsciiDim lLngEncryptedlLngMaxIndex = Len (pStrMessage) If lLngMaxIndex = 0 Then Exit FunctionFor lLngIndex = 1 To lLngMaxIndexlBytAscii = Asc (Mid (pStrMessage, lLngIndex, 1)) lLngEncrypted = Crypt (lBytAscii, PublicKey) Encode = Encode & NumberToHex (lLngEncrypted, 4) NextEnd FunctionPublic Function Decode (ByVal pStrMessage) Dim lBytAsciiDim lLngIndexDim lLngMaxIndexDim lLngEncryptedDataDecode = "" lLngMaxIndex = Len (pStrMessage) For lLngIndex = 1 To lLngMaxIndex Step 4lLngEncryptedData = HexToNumber (Mid (pStrMessage, lLngIndex, 4)) LbyTascii = crypt (llngencrypteddata, privatekey) decode = decode & chr (lbytascii) Nextend FunctionPrivate Function Numbertohex (Byref PLNGNUMBER, BYREF PLNGLENGTH) NUMBERTOHEX = Right (String (PLNGLENGTH, "0") & HEX (PLNGNUMBER), PLNGLENGTH) End Function</p>
<p>Private function hextonumber (byref pstrhex) hextonumber = clng ("& H" & pstrhex) end function</p>
<p>END CLASS%></p></div><div class="text-center mt-3 text-grey">
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