RE: Random number seed in RSA

[sakthi.subramaniam]

Title: Message

HI.,

 You can use /dev/random as a seed generator..I belive that cygwin has the support for /dev/random device..

 For that u can use RAND_load_file("/dev/random", no_of_bytes) for programming the seed.

or otherwise you can use the static character buffer (rnd_seed)as a seed and use

 RAND_seed(rnd_seed, sizeof rnd_seed); to program the seed. In the second case you need to store the seed such a way hackers should not break the seed..

 

Hope this helps..

Sakthi S G

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Joe smith
Sent: Tuesday, August 10, 2004 3:21 AM
To: [EMAIL PROTECTED]
Subject: Random number seed in RSA

Hi,

I have a snippet that encrypts/decrypts using RSA.

 

#include <stdio.h>

#include <openssl/rsa.h>

#include <string.h>

// RSATest: Program illustrating Simple RSA Encryption/Decryption

int main()

{

char *plain="Sample text"; //Sample text (plain text) to Encrypt/Decrypt

char *ciphertext;

char *plain1;

int enclen,i,declen;

printf("%s\n",plain);

// Generate RSA key

RSA *rsa1= RSA_generate_key(1024,65537,NULL,NULL);

// RSA_size() will determine how much memory must be allocated for an RSA encrypted value

ciphertext = (char *)malloc(RSA_size(rsa1));

printf("RSA size %d",RSA_size(rsa1));

 

I am using Cygwin. My question is this....Where and How do I seed the random number generator?

Thanks,

Joe

 

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