RE : Random number seed in RSA
You can also use the RAND_status() function that implicitly calls RAND_poll().
RAND_poll() actually uses memory state, processes, handles, screen state... to
initialize the PRNG. If it is not sufficiant (it usually is), you can read some
entropy from a file using RAND_read() function.
Marc.
-Message d'origine-
De : lbfi [mailto:[EMAIL PROTECTED]
Envoyé : mardi 10 août 2004 12:59
À : openssl-users
Objet : Re:Random number seed in RSA
You can use these functions:
void RAND_seed(const void *buf, int num);
void RAND_add(const void *buf, int num, double
entropy);
int RAND_status(void);
int RAND_event(UINT iMsg, WPARAM wParam, LPARAM
lParam);
void RAND_screen(void);
You need to seed PRNG before the function
RSA_generate_key(...). a good explanation you will find
in:
http://www.openssl.org/docs/crypto/RAND_add.html
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 thisWhere and
How do I seed the random number generator?
Thanks,
Joe
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RE: Random number seed in RSA
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 smithSent: Tuesday, August 10, 2004 3:21
AMTo: [EMAIL PROTECTED]Subject: Random number
seed in RSA
Hi,
I have asnippet 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 thisWhere and How do I seed the
random number generator?
Thanks,
Joe
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