Login ProductsSalesSupportDownloadsAbout |
Home » Technical Support » Elevate Web Builder Technical Support » Support Forums » Elevate Web Builder General » View Thread |
Messages 1 to 8 of 8 total |
Problem use library crypto-js |
Wed, Jul 22 2015 10:45 AM | Permanent Link |
Pasquale Web Pos srl | Hi I would like to use the library MD5
https://code.google.com/p/crypto-js/ in my application but I can not ( I get the error : MD5 is not defined) Someone can help ? I Occor a practical example of using the function MD5 , tanks . |
Wed, Jul 22 2015 2:41 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Pasquale,
<< in my application but I can not ( I get the error : MD5 is not defined) >> Did you define an external interface in EWB for the external JS code ? http://www.elevatesoft.com/manual?action=viewtopic&id=ewb2&topic=External_Interfaces If not, then you'll need that first. Tim Young Elevate Software www.elevatesoft.com |
Wed, Jul 22 2015 2:43 PM | Permanent Link |
Raul Team Elevate | On 7/22/2015 10:45 AM, Pasquale wrote:
> Hi I would like to use the library MD5 > https://code.google.com/p/crypto-js/ > in my application but I can not ( I get the error : MD5 is not defined) > Someone can help ? You need to use external interfaces if you wish to use external library: http://www.elevatesoft.com/manual?action=viewtopic&id=ewb2&topic=External_Interfaces In general you need to do 2 things: 1a. include the external javascript file in the project (this way EWB takes care of loading it etc). OR 1b. if you want to access the file by URL then you need to use the TScript control to load it runtime (assing the URL to the TScript URL property) 2. declare the functions in the file using the "external" keyword (i.e. "external function MD5(sIn:string):string;") 3. now you can call MD5 from your code For a generic sample on this see for example this thread (and there are others): http://www.elevatesoft.com/forums?action=view&category=ewb&id=ewb2_preview&page=1&msg=976#976 Raul |
Sun, Nov 15 2015 12:37 PM | Permanent Link |
Tom Urlep | /*
Raul wrote: On 7/22/2015 10:45 AM, Pasquale wrote: > Hi I would like to use the library MD5 > https://code.google.com/p/crypto-js/ > in my application but I can not ( I get the error : MD5 is not defined) > Someone can help ? You need to use external interfaces if you wish to use external library: http://www.elevatesoft.com/manual?action=viewtopic&id=ewb2&topic=External_Interfaces In general you need to do 2 things: 1a. include the external javascript file in the project (this way EWB takes care of loading it etc). OR 1b. if you want to access the file by URL then you need to use the TScript control to load it runtime (assing the URL to the TScript URL property) 2. declare the functions in the file using the "external" keyword (i.e. "external function MD5(sIn:string):string;") 3. now you can call MD5 from your code For a generic sample on this see for example this thread (and there are others): http://www.elevatesoft.com/forums?action=view&category=ewb&id=ewb2_preview&page=1&msg=976#976 Raul */ Attached is an example of calling function MD5 from CryptoJS according to advice in this post. Can somebody enlighten me what is wrong? Attachments: HashTest.7z |
Sun, Nov 15 2015 12:51 PM | Permanent Link |
Tom Urlep | Tom Urlep wrote:
/* Raul wrote: On 7/22/2015 10:45 AM, Pasquale wrote: > Hi I would like to use the library MD5 > https://code.google.com/p/crypto-js/ > in my application but I can not ( I get the error : MD5 is not defined) > Someone can help ? You need to use external interfaces if you wish to use external library: http://www.elevatesoft.com/manual?action=viewtopic&id=ewb2&topic=External_Interfaces In general you need to do 2 things: 1a. include the external javascript file in the project (this way EWB takes care of loading it etc). OR 1b. if you want to access the file by URL then you need to use the TScript control to load it runtime (assing the URL to the TScript URL property) 2. declare the functions in the file using the "external" keyword (i.e. "external function MD5(sIn:string):string;") 3. now you can call MD5 from your code For a generic sample on this see for example this thread (and there are others): http://www.elevatesoft.com/forums?action=view&category=ewb&id=ewb2_preview&page=1&msg=976#976 Raul */ Attached is an example of calling function MD5 from CryptoJS according to advice in this post. Can somebody enlighten me what is wrong? Previous attachment was incomplete. Sorry Attachments: HashTest.zip |
Sun, Nov 15 2015 4:41 PM | Permanent Link |
Raul Team Elevate | On 11/15/2015 12:51 PM, Tom Urlep wrote:
> Attached is an example of calling function MD5 from CryptoJS according to > advice in this post. Can somebody enlighten me what is wrong? There is no function "md5" in the javascript library you're loading ( http://crypto-js.googlecode.com/svn/tags/3.1.2/build/rollups/md5.js ). External function declarations must match "exactly" to the actual functions - "external" just tells EWB at compile time "don't worry and assume this function call is ok" and then when you call it you get a runtime error since it does not exist. Looking at the CryptoJS it is PITA to read (at least for my JS skills) so i cheated for now and for quick solution just wrote a wrapper for it. Anyways, create a new javascript file which consists of this: function myMD5(s) { var hash = CryptoJS.MD5(s); return hash.toString(); } Then save it to a file and include as external file in EWB project (for example helper.js) Change your external definition to "external function myMD5(s:string):string;" and then call to it as such "Label1.Caption := myMD5( Edit1.Text);" It works for me here - i'm seeing proper MD5 hashes generated - i will just comment that one should not use MD5 for anything these days. Would need Tim or somebody who deals with external JS more to see if there is a more straightforward way of dealing with this. Raul |
Mon, Nov 16 2015 3:35 AM | Permanent Link |
Tom Urlep | /*
Anyways, create a new javascript file which consists of this: function myMD5(s) { var hash = CryptoJS.MD5(s); return hash.toString(); } Then save it to a file and include as external file in EWB project (for example helper.js) Change your external definition to "external function myMD5(s:string):string;" and then call to it as such "Label1.Caption := myMD5( Edit1.Text);" */ I tried your advice and it works OK. Thank you. Tom |
Mon, Nov 16 2015 2:34 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Raul,
<< Looking at the CryptoJS it is PITA to read (at least for my JS skills) >> Yeah, it's a bit of a mess, structurally, but pretty much par for the course for JS libraries. Use JS - you can design your own inheritance model ! The key phrase is in the docs: "The hash you get back isn't a string yet. It's a WordArray object. When you use a WordArray object in a string context, it's automatically converted to a hex string." So, the hash result is a WordArray, so you would need to define the minimum external interface like this: type external TWordArray emit CryptoJS.WordArray = class public { Encoder parameter not prototyped here... } function toString: String; function concat(sourceArray: TWordArray): TWordArray; procedure clamp; function clone: TWordArray; class function random(numBytes: Integer): TWordArray; end; external CryptoJS emit CryptoJS = class public class function MD5(const input: String): TWordArray; end; and then use it like this: procedure TForm1.Button2Click(Sender: TObject); begin ShowMessage(CryptoJS.MD5('Password').toString); end; I just loaded the JS dynamically using a TScript instance. Tim Young Elevate Software www.elevatesoft.com |
This web page was last updated on Friday, November 1, 2024 at 07:01 PM | Privacy PolicySite Map © 2024 Elevate Software, Inc. All Rights Reserved Questions or comments ? E-mail us at info@elevatesoft.com |