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OK_Decrypt ( Text ; Key )

Decrypt data encrypted with OK_Encrypt CF

  Average rating: 4.6 (32 votes) Log in to vote

Peter Vinogradov - Show more from this author

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

//OK_Decrypt ( Text ; Key ) // 12-30-10 Peter Vinogradov Let ( [ Ki = If (Left ( Key ; 2 ) <>"||" ; "||1||" & Key ; Key ); i = GetValue ( Substitute ( Ki ; "||" ; ¶ ) ; 2); Key = GetValue ( Substitute ( Ki ; "||" ; ¶ ) ; 3); v = Char ( Code ( Left ( text ; 1 ) ) - Code (Middle (key ; i;1) ) ); Text = Right ( text ; Length (text)-1); i = If ( i>= Length ( key); 1 ; i+1) ] ; v & If (Length (text) ; OK_Decrypt (Text ; "||" & i & "||" & Key) ) ) Click to copy

Decrypts text encrypted with the "OK_Encrypt" CF

 

Comments

		Charles, Elberton Aug 23, 2014
Strange... the Encrypt half of the function seems identical to this even to having the Decrypt comments... Does that mean we only need one function to do both, encrypt and decrypt?

		Peter Vinogradov Aug 25, 2014
Yep, they've essentially the same function, except in the Decrypt version you subtract the key letter from the ciphertext, and in the Encrypt version you add the keyletter to the ciphertext. It's v = Char ( Code ( Left ( text ; 1 ) ) - Code (Middle (key ; i;1) ) ); versus v = Char ( Code ( Left ( text ; 1 ) ) + Code (Middle (key ; i;1) ) ); But you're right, I didn't change it in the comment text - sloppy of me. I've fixed it now.

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