It (3DES Wrapper) will encrypt them, but any attempt to decrypt a string greater than 7 characters generates the error Invalid length for a Base-64 char array. I have reproduced on several machines running 1.6.6 using very simple code to decrypt and enrypt a string (no BO's, no custom anything).

For example "1111111" encrypts and decrypts fine, but "11111111" will encrypt but not decrypt.

Any insight appreciated as always.

The occurs in tripledeswrapper.vb at the function Decrypt, in the first line of the function:

Public Function Decrypt(ByVal text As String) As String

Dim input() As Byte = Convert.FromBase64String(text)

Dim output() As Byte = Transform(input, m_des.CreateDecryptor(m_key, m_iv))

Return m_utf8.GetString(output)

End Function

Keith Chisarik

That could be tough. I just checked and if you encrypt the last four, it won't be anything like the equivalent last four in the full SSN.



I.e. here is an example (SSN -> encrypted text)



555-55-5555 -> zScg4jyKGSbryxUfHJktAQ==

5555 -> Z8cKO1v0OfI=



One option might be to denormalize a bit and store the last four in another column...



Hopefully somebody a lot smarter than me will respond soon!

Let me know if you didn't get your question answered...I have been more busy than a one legged man in a butt whoopin' contest lately...there is some more Texas lingo for ya .  I have been trying to create a POS (Point of Sale) interface and getting some of these hardware companies to work with you do give you the information to write software for their devices has been a pain!  If anyone has any experience with writing an app towards a Verifone 1000SE device, then please feel free to share!!!  I think I just finally signed the last required NDA to get a development guide with all of the commands to send to the device...I have my fingers crossed!  I have been trying to write towards OPOS for all devices, but I have finally given up that pipe dream as I don't think I am going to be able to shoot par with OPOS as some of these devices won't support it...but I suppose that is life in the development world..OK, I will shut up now!