Blowfish in ASP

This is a conversion of David Ireland's Blowfish Visual Basic code into VBScript and a sample demo ASP page by Hart Penn.

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Download BlowfishASP.zip (20 kB) last updated 2009-05-06.

Blowfish in ASP

Here are some hints for converting your Visual Basic (VB6/VBA) code into VBScript:

Surround your code with <% and %>
Remove all type names from dimension statements, i.e. globally delete " As String", " As Integer", " As Long", etc.
Remove any specific sizes for strings, e.g. remove the "* 8" from Dim strBlock As String * 8.
If you've used the faster string functions that end in $ such as Asc$() or Mid$(), remove the trailing "$". Hint: globally replace "Asc$(" with "Asc(".
In your For loops, remove anything after the Next keyword, e.g. If you typically write your loops as
```
For i = 1 To 10
' ... 
Next i
```
remove the "i" after the Next.
Replace any functions that are not valid in VBScript. In the Blowfish example, we had to replace the very useful StrConv(). For a list of valid functions in VBScript see the Microsoft VBScript Features page, and also VBScript Features not in Visual Basic for Applications.
Remove the keyword Private from constant definitions, as in Private Const scNAME

This is not meant to be an exhaustive list, but we hope a helpful one.

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This page last updated 9 September 2025.