RSA Encryption Javascript

Question

I have been instructed to write an application that takes some data then encrypts it with an RSA public key.

It needs to be "RSA encryption":

Which encryption cipher is RSA meant to use as standard?

var key = "TUlHZE1BMEdDU3FHU0liM0RRRUJBUVVBQTRHTEFEQ0Jod0tCZ1FDbVFiTWc3SWRpeHVmYWEwcDd2ODVLVytmUnVlZ216UUhibnNoWjhmbXlTQW9MMXRFVzAyNEZKVFlSTFZxN0VsV2p1R0U4aHQ3RmJjN1NURWpxZVViWU5xdnRiVWN6UFZYSE5FdStYRUVndGszazlFNXVQWG0wVzRIc3RtK0FhRXcyMmxxb2lFNGlrT1QzZzdPRXNHSVFCMVNlSlRtVTE1eFBBZ3M3SXRjTVFRSUJFUT09";

var data = "Xa21dr";

Your question doesn't explain what you've done to try and solve the problem; it currently reads like a request for code. Please share your attempted implementation and explain how it fails to meet your requirements. — Duncan Jones
– Duncan Jones, Commented Jul 16, 2013 at 19:57
First of all, there seems to be little reason to perform double base 64 encoding on a BER encoded PKCS#1 public key. (I was wondering why the data did not start with an uppercase M :) — Maarten Bodewes
– Maarten Bodewes, Commented Jul 16, 2013 at 20:24
@DuncanJones i am not asking for "code" if you read what i am asking you will understand my question i am asking HOW what is the fundamentals of encrypting a RSA public key and some data together because i cant find anything that works. — K_G
– K_G, Commented Jul 17, 2013 at 7:38
@owlstead yes that seems correct i have decoded the key before with base64 that will give you that for example - MIGdMA0GCSqGSIb3DQEBAQUAA4GLADCBhwKBgQCmQbMg7Idixufaa0p7v85KW+fRuegmzQHbnshZ8fmySAoL1tEW024FJTYRLVq7ElWjuGE8ht7Fbc7STEjqeUbYNqvtbUczPVXHNEu+XEEgtk3k9E5uPXm0W4Hstm+AaEw22lqoiE4ikOT3g7OEsGIQB1SeJTmU15xPAgs7ItcMQQIBEQ== but apparently the key must stay intact how its received then encrypt the data with it bytes[] to be sent out. — K_G
– K_G, Commented Jul 17, 2013 at 7:41
you obvious don't know how RSA works then, nevermind this has all been sorted now! — K_G
– K_G, Commented Jul 25, 2013 at 21:01

K_G · Accepted Answer · 2023-06-25 02:09:10Z

23

Found the answer -

RSA Encryption standard uses PKCS #1

Best library to use is pidCrypt, nothing else worked for me!

pidCrypt https://sourceforge.net/projects/pidcrypt/

Forge https://github.com/digitalbazaar/forge

They failed to let me know that the RSA Public Key was meant to be base64 decoded also before encrypting the DATA before posting.

edited Jun 25, 2023 at 2:09

answered Jul 17, 2013 at 13:28

K_G

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6 Comments

Tarion Over a year ago

What is the format of the encrypted data? Is it also base 64?

Toubey Over a year ago

pidder is no longer online?

K_G Over a year ago

@Toubey looks to be still online to me just checked their website - pidder.com/pidcrypt - still accessible. you can download from source forge directly too - sourceforge.net/projects/pidcrypt

Philzen Over a year ago

The project is no longer maintained. Also @whitedeath - can you clarify whether it implemented PKCS#1 v1.5 (which is understand is easily attackable since 1998) or PKCS#1 v2.2 (RSA with Optimal Asymmetric Encryption Padding). For those reasons and ease of use i went with forge, which also is a pretty active project on github.

K_G Over a year ago

@Philzen No idea which PKCS v is packaged with pidCrypt you will need to download the source and take a look (i needed PKCS #1 so went with pidCrypt as it worked perfectly for my needs).

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dlongley · Accepted Answer · 2013-07-28 17:36:27Z

13

You may be interested in trying out forge (it does RSA and more). There are lots of examples on the README:

https://github.com/digitalbazaar/forge

answered Jul 28, 2013 at 17:36

dlongley

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2 Comments

K_G Over a year ago

thanks, pidCrypt is working perfectly but will take a look. pidCrypt offers not just RSA too.

Todd Horst Over a year ago

forge is very nice. I had a little trouble getting it started, so I created the demo here: digitalbazaar.github.io/forge

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