Here is the solution I came up with:

* Get FoxCrypto.FLL at http://www.connectthenet.com/foxpro/FoxCrypto.fll


SET LIBRARY TO FoxCrypto.FLL
LOCAL lnHandle
CLEAR
lcBuffer = "Testing"
? "     Base Value: ", lcbuffer

lnHandle = Base64encoderCREATE( .F. )
IF lnHandle > 0
    Base64encoderPUT(lnHandle, lcBuffer)
    Base64encoderCLOSE(lnHandle)
    lnSize = Base64encoderMaxRetrievable(lnHandle)
    lcBase64Encoded = Base64encoderGET(lnHandle, lnSize)
    ? "Encrypted Value: ", lcBase64encoded
    Base64encoderDestroy(lnHandle)
ENDIF

lnHandle = Base64decoderCREATE()
IF lnHandle > 0
    Base64decoderPUT(lnHandle, lcBase64encoded)
    Base64decoderCLOSE(lnHandle)
    lnSize = Base64decoderMaxRetrievable(lnHandle)
    lcBase64decoded = Base64decoderGET(lnHandle, lnSize)
    ? "Decrypted Value: ", lcBase64decoded
    Base64decoderDestroy(lnHandle)
ENDIF
? "Matches = ", lcBase64decoded == lcBuffer

>>I have a DBF that contains a user userid and password. I would like to encrypt the password column and be able to still use its value as normal. What is the best most straightforward way to do this without purchasing a third party product?
>
>Would it be possible to store hashes of those values, rather than the values themselves?