Re: How to implement DH algorithm using openSSL library?

r generating public key? > > I dint find any sample programs for this problem. It would be great if > anyone suggest some sample programs related to my above mentioned task!! > > > Thanks and Regards, > Yamini. > -- Prashant Batra

seg-fault in malloc called from DH_compute_key

Hi, I am observing a seg-fault with following back-trace- #0 0x089277fe in _int_malloc () #1 0x08926a72 in malloc () #2 0x087df811 in default_malloc_ex (num=4, file=0x89eda40 "bn_lib.c", line=336) at mem.c:79 #3 0x087dfe30 in CRYPTO_malloc (num=4, file=0x89eda40 "bn_lib.c", line=336) at mem.

DH_generate_key and DH_compute_key for IKEV2

Hello, DH_generate_key and DH_compute_key seems to take lot of CPU for key and secret generation respectively. I think this is the most CPU intensive task in all of the IKEV2 exchanges. Is there some way to optimize the same, particularly secret computation. Regards, Prashant

Re: DH_compute_key query

Thanks Steve a ton. I think I was missing some basic design understanding. -Prashant On Fri, Jul 22, 2011 at 5:08 PM, Dr. Stephen Henson wrote: > On Thu, Jul 21, 2011, Prashant Batra wrote: > > > Hello, > > > > I am using DH exchange in ikev2 for generating secret key

DH_compute_key query

Hello, I am using DH exchange in ikev2 for generating secret key b/w 2 parties. I am observing some awkward thing, in some of the cases, the secret calculated by both the parties is not the same, although the input (public key, private key and peer public key ) is same. Hexdump: Length [128] [0

3des-cbc

44 02 00 00 00 18 01 00 00 00 07 84 00 10 0c a0 0c a0 c0 a8 65 65 c0 a8 65 65 7b 8b 73 41 12 05 -- Prashant Batra

Re: question about des_ede3_cbc_encrypt()

is the case, how to determine the output length for decrypt? > > Best Regards, > Tony > -- Prashant Batra Follow the dreams!!

Re: evp_encrypt_init_ex

Thanks Steve. On Thu, May 5, 2011 at 6:11 PM, Dr. Stephen Henson wrote: > On Thu, May 05, 2011, Prashant Batra wrote: > > > Hi, > > > > One question regarding EVP_Encrypt APIs. > > > > > > EVP_EncryptInit_ex(&ctx, cipher, NULL, (unsigned char *)e

Re: Problem with HMAC_Init_ex

Thanks everyone for help, It was a sad issue with my library linking. Resolved the problem. Regards, Prashant On Thu, May 5, 2011 at 9:45 AM, Jeffrey Walton wrote: > 2011/5/4 Prashant Batra : > > http://pastebin.com/0BG97RDH > > This does not contain complete source code, but

evp_encrypt_init_ex

)enc_key->v, NULL) Step-2 EncryptData-> //Can call this many times EVP_EncryptUpdate(); EVP_EncrpyFinal(); One solution is to use the same IV for all calls to Encrypt, but I guess this defeats the purpose of random IV. Similarly case for for decrypt also. Thanks, Prashant. -- Pras

Re: Problem with HMAC_Init_ex

> > Regards > > > - > Дизайнерски обувки с до -70%. Регистрирай се и пазарувай. > <http://a.abv.bg/www/delivery/ck.php?oaparams=2__bannerid=4884__zoneid=63__oadest=http://clk.tradedoubler.com/click?p=191500&a=1875689&g=19425934> > -- Prashant Batra Follow the dreams!!

Problem with HMAC_Init_ex

Hi all, I am finding a strange problem with HMAC_Init_ex. After the call to this function the stack is getting corrupted. The sequence of functions used are- HMAC_CTX ctx ; HMAC_CTX_init(&ctx); HMAC_Init_ex(&ctx, hash_key->v, hash_key->l, EVP_sha1(), NULL); Key->v points to 20 bytes of memory,

Re: DH key exchange issue

Yes I used the same generator,'5'. So that means I need to use the same prime too for both the parties On 4/22/11, Dave Thompson wrote: >> From: owner-openssl-us...@openssl.org On Behalf Of Prashant Batra >> Sent: Thursday, 21 April, 2011 09:16 > >>

DH key exchange issue

Hi, I tried the dhtest sample provided in the test folder of openssl-0.9.8g. What it does is- Creates 2 DH objects using a single prime and generator value. It then calculates the public, private keys pairs using the 2 DH's. Then computes the secret for each DH using the public key of the other DH.