require ECDH java code

m.ganguli · February 16th, 2007, 08:40 AM

i found the neccessary code for the ECDSA algorithm and have implemented it.I however could not implement the ECDH algorithm.I could find in the book.Can someone let me know how i am supposed to implement that?

dgh · February 17th, 2007, 06:58 PM

I'm not sure I fully understand the question, but if you're looking for the basic source code supporting the algorithm you can find it in org.bouncycastle.crypto.agreement.

Regards,

David

m.ganguli · March 8th, 2007, 12:30 AM

Thanx. I got the code for ECDH. I now want to use any symmetric algorithm, say blowfish, and exchange the key used using the ECDH. that would mean I have to include the algorithm in ECDH program. how may i proceed?

dgh · March 8th, 2007, 04:00 AM

Traditionally the approach is to feed the value produced by ECDH into a key derivation function and then do the encryption using the resulting key. You can find some examples of the key derivation functions in the package org.bouncycastle.crypto.agreement.kdf (note: this is new for 1.36, it's already in CVS though).

Regards,

David

roja · March 18th, 2008, 02:45 PM

hi everybody,

I am doing a project based on watermarking. for that i have to use ECDSA algorithm to implement it to generate a digital signature for the image which i use as cover image. I have now obtained the hash values using Sha 512 of both the cover image and the text document which has the secret info to be passed. Now what crypto service provider should i use to implement ECDSA and after getting the cryptoservice provider how should i do? where will i get that crytoApI

dgh · March 18th, 2008, 04:12 PM

The current edition of the Bouncy Castle provider supports SHA512withECDSA.

Regards,

David

roja · March 19th, 2008, 07:20 AM

Can anyone post me the source code of ECDSA(either in JAVA or in C#). I need it just for a reference. I need the GUI too please.

dgh · March 19th, 2008, 03:15 PM

The source for the algorithm is available in both Java and C# at http://www.bouncycastle.org

Regards,

David

amrishodiq · March 2nd, 2009, 04:08 AM

Quote:

Originally Posted by m.ganguli

i found the neccessary code for the ECDSA algorithm and have implemented it.I however could not implement the ECDH algorithm.I could find in the book.Can someone let me know how i am supposed to implement that?

I write about implementation of Elliptic Curve Diffie-Hellman here: http://www.amrishodiq.co.cc/elliptic...ion-with-java/. I use Rjndael 256 as the symmetric cipher and SHA 256 as the hashing algorithm. I think this enough for you. My code require Bouncy Castle.

kalluri_88 · October 6th, 2009, 07:19 AM

Quote:

Originally Posted by m.ganguli

i found the neccessary code for the ECDSA algorithm and have implemented it.I however could not implement the ECDH algorithm.I could find in the book.Can someone let me know how i am supposed to implement that?

Dear Ganguli,
I am krishna working in ECDH,I hope by this time you might have finished your coding for ECDH,can u please share that code to me and send it to my mail ([email protected]).I am very much in need of the code please help me out......
regards
krishna