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Dordrecht7177366
Inspiring
April 26, 2021
Answered

How to decode and encrypted value using DESEDE and a .key file?

  • April 26, 2021
  • 2 replies
  • 859 views

Hi all. Help would be very appreciated...

 

I have a requirement to accept a POST parameter that is encrypted using DESede/ECB/PKCS5Padding, and decrypt that param for use in my application. 

 

In attempting to test out this encryption and decryption, the following code was found to work successfully:

<cfset theKey = generateSecretKey('DESEDE')>
<cfset varString = "Testing">
<cfset encrypted=encrypt(varString, theKey, 'DESEDE','Base64')> 
<cfset decrypted=decrypt(encrypted, theKey, 'DESEDE','Base64')>
<cfdump var="#decrypted#">

 

Our issue is that in the test above the key value produced appears to be plain text, but the key that we are receiving from our data sender is in a .key file, and which seems to contain binary data. Can anyone tell me how a .key file might be used to decrypt a desede encrypted file?

This topic has been closed for replies.
Correct answer Dordrecht7177366

Thank you for the effort, BKBK, but what worked was running the binary data through the ToBase64() function.

2 replies

D
Dordrecht7177366AuthorCorrect answer
Inspiring
April 29, 2021

Thank you for the effort, BKBK, but what worked was running the binary data through the ToBase64() function.

    BKBK
    BKBK
    Community Expert
    April 30, 2021

    Glad to hear. Could you please share your code? It will help someone else in future, of that I am sure.

    D
    Dordrecht7177366Author
    Inspiring
    May 5, 2021

    Thsi is the code that worked:

    <cffile action="readbinary" file="C:\junk\myBinaryKey.key" variable="keyAsBinary">
<cfset myKey = ToBase64(keyAsBinary)>
<cfoutput>#myKey#</cfoutput>
      BKBK
      BKBK
      Community Expert
      April 26, 2021

      Without much thought, my immediate instinct is to try something like:

      <!--- First check whether the key file contains comments. If so, you might have to filter them out before going any further. --->
<cffile action="readbinary" file="absolute_path_to_key_file" variable="keyAsBinary">
<cfset theKey = toString(keyAsBinary)>
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