- #Xor Encrypt Decrypt Php how to#
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Now running the same string through there, we get the following output:
We now use the char at index modulos the size of the key array to XOR, rather than the same key for each character to encrypt. However, the reason that it is not entirely secure is that data almost always contains patterns (JSON uses ' //Any chars will workįor (int i = 0 i < toEncrypt.size() i++) The idea behind it is that if you don't know the original character or the XOR encryption key, it is impossible to determine what either one is. XOR encryption is also used often as a part of more complex encryption algorithms. XOR encryption is great for storing things like game save data, and other data types that are stored locally on a users computer, that while not a big deal if they are tampered with, you would like to deter people from doing so. #Xor Encrypt Decrypt Php cracked#
XOR encryption (or Exclusive-OR encryption) is a common method of encrypting text into a format that cannot be trivially cracked by the average person. If you are looking for XOR encryption for other languages, including C, C#, Dart, Go, Groovy, Java (Android Compatible), JavaScript, Objective-C, and Python, I have made them available at this GitHub repo.
#Xor Encrypt Decrypt Php how to#
Open the attached zip file and click on the button on sheet1 and follow the prompts.Related Posts Why React Native Modals Require an onRequestClose Callback Property on Android How to Conditionally Render a Component in React Native Creating Custom Dimensions and Tracking Word Count & Range in Google Analytics Fullscreen Background Image in React Native React Native Tutorial Part 3: Developing a Calculatorįor details on how to implement XOR encryption using Go, see this post.
#Xor Encrypt Decrypt Php code#
It can be activated within code or used in the worksheet itself (but note that keeping the key used in the worksheet rather defeats the object of the encryption code - you would probably want to copy the formula results +paste values). The functions take two arguments - the string to encrypt/decrypt and the key to use for the encyption/decryption. If bEncOrDec Then XorC = "xxx" & XorC 'add "xxx" onto encrypted text If l > UBound(byKey) Then l = LBound(byKey) 'ensure stay within bounds of Key 'check whether running encryption or decryption (flagged by presence of "xxx" at start of sData):įor i = LBound(byIn) To UBound(byIn) - 1 Step 2īyOut(i) = ((byIn(i) + Not bEncOrDec) Xor byKey(l)) - bEncOrDec 'avoid Chr$(0) by using bEncOrDec flag If Len(sData) = 0 Or Len(sKey) = 0 Then XorC = "Invalid argument(s) used": Exit Function "Please confirm OK or Cancel to exit", vbOKCancel, "Confirm Key")įunction XorC(ByVal sData As String, ByVal sKey As String) As Stringĭim l As Long, i As Long, byIn() As Byte, byOut() As Byte, byKey() As Byte RetVal = MsgBox("This is the key you entered:" & vbNewLine & Chr$(34) & sKey & Chr$(34) & vbNewLine & _ SKey = Application.InputBox("Enter your key", "Key entry", "My Key",, ,, , 2) 'this sub is only present to demonstrate use of the function! 'it is not required to use the function. Thanks to Mdmackillop for suggested (and incorporated) improvement to the function. Longer Keys provide better encryption protection (as do longer strings to encrypt). Note: This operator has lower precedence than the assignment operator, which may lead to confusing results. The return value will only be true if one of the statements is true and the other one is false. The function adds one to the individual byte values of the generated encrypted string so that returning Ascii character 0 is avoided (Excel will not display this character and it thus causes encryption to fail). Logical operators are used to combine conditional statements. 
Others can still access the workbook using this method, but if they do not know the key used to encrypt the data, it is very difficult to decipher what the encrypted string is. This could be useful if you wish to send sensitive information to someone, or want to store sensitive information in a workbook, and wish to use more protection than the standard Excel interface allows (eg worksheet protection). The function makes use of bitwise Xor comparisons on the string to be encrypted and a string key provided by the user. Encrypt and decrypt strings using a Xor algorithmĮncrypts or decrypts a string of text to a string of characters based on a user-specified encryption key.
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