what about
rsa_public_key->n
and
rsa_public_key->e
You could do
BN *n = BN_dup(rsa_public_key->n);
BN *e = BN_dup(rsa_public_key->e);
And do what you want with them (don't forget to free them)
If you are wanting to display them
char *n_txt = BN_bn2dec(n);
char *e_txt = BN_bn2dec(e);
or
char *n_hextxt = BN_bn2hex(n);
char *e_hextxt = BN_bn2hex(e);
if you want the data in a non-openssl format for some other library you can get
the bits
int n_len = BN_num_bytes(n);
int e_len = BN_num_bytes(e);
unsigned char *raw_n,*raw_e
if (! raw_n = malloc(n_len)) { fail ...}
if (! raw_e = malloc(e_len)) { fail ...}
if (BN_bn2bin(n,raw_n)!= n_len) { fail...}
if (BN_bn2bin(e,raw_e)!= e_len) { fail...}
-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Bizhan Gholikhamseh (bgholikh)
Sent: Thursday, October 22, 2009 6:20 AM
To: [email protected]
Subject: Newbie questions: extracting public key's exponent and modules.
Hi All,
Here is the part of the code that was previously developed. The code
successfully extract a public key from some secure server, now I like to
know how to extract the exponent and modules of the public key
(rsa_public_key).
EVP_PKEY *public_key = NULL;
RSA *rsa_public_key = NULL;
...
...
public_key = ENGINE_load_public_key(e1, file_nm_public,
UI_OpenSSL(), NULL);
if (public_key == NULL)
{
...
exit (-1);
}
rsa_public_key = EVP_PKEY_get1_RSA(public_key);
Many thanks in advance,
Bizhan
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______________________________________________________________________
OpenSSL Project http://www.openssl.org
User Support Mailing List [email protected]
Automated List Manager [email protected]
