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Encryption and Decryption

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    Encryption and Decryption

    Thought I�d mention this as it has been driving me nuts all morning and it might save someone else a load of grief.

    I need to create a random alphanumeric and then encrypt it.
    Then I need to transmit it and decrypt it the other end.

    If you get messages saying that the block length is wrong when you try to decrypt, it is most likely that the data field you are encrypting is too large.

    The alphanumeric number I wanted to encrypt is Char 7 but I created all of the fields;

    Number
    Encrypted
    Decrypted (testing purposes)

    As being 50 char to accommodate the alpha numeric. This was a mistake.

    When it came to decrypting, I got the length error which alerted me to the problem with the encrypted length based on the field to be encrypted.

    Using "A"+LTRIM(STR(RAND()*1000000)) gives me a 7 char alphanumeric and the field size needs to be similar as it would appear that the encryption function also encrypts the padding spaces.

    I haven�t tried adding Trim to the A5_encrypt_string() as it�s sure to go wobbly.
    See our Hybrid Option here;
    https://hybridapps.example-software.com/


    Apologies to anyone I haven't managed to upset yet.
    You are held in a queue and I will get to you soon.

    #2
    Re: Encryption and Decryption

    Yes Ted,
    My #1 rule now.... When things aren't working...... alltrim(). I just posted a thread and Gabriel told me I didn't need to alltrim something. Yup, but it is now so engrained in me after so many countless hours of trying to discover why things weren't working and the answer was so often fixed with alltrim(), that I just do it regardless if needed or not. :)
    Mike W
    __________________________
    "I rebel in at least small things to express to the world that I have not completely surrendered"

    Comment


      #3
      Re: Encryption and Decryption

      Hi Mike,

      Originally posted by Mike Wilson View Post
      My #1 rule now.... When things aren't working...... alltrim()....... it is now so engrained in me after so many countless hours of trying to discover why things weren't working and the answer was so often fixed with alltrim(), that I just do it regardless if needed or not. :)
      I can't tell you how many times there are leading spaces in data. People enter data in sloppy ways, so you might find key indexed fields like last name, zipcode, 1st name, etc all with an accidentally typed leading space, sorting data incorrectly. Sometimes it's the copy and paste that the leading or trailing blanks are selected for the copy that puts the wrong data in.

      There is almost no measureable speed penalty for using it either.


      Any way, never assume data is perfect, and alltrim get's rid of those unexpected spaces (and other whitespace characters) works well.
      Regards,

      Ira J. Perlow
      Computer Systems Design


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