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/* Key generator for rsa keys (SSH2!)
* (C) 2002 Sebastian Krahmer.
* WARNING: theres no random is the keys, so
* THE GENERATED KEYS ARE WEAK! Do not use it to
* generate your pubkeys, this program is for debugging only.
*/
#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
extern "C" {
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/bn.h>
#include <openssl/evp.h>
}
#include <string.h>
#include "base64.h"
#include "misc.h"
int rsa2blob(RSA *key, unsigned char *buf, size_t buflen)
{
size_t blen = buflen;
int h;
unsigned char *tmp;
if (blen < 4)
return -1;
if (key->e->neg || key->n->neg)
printf("AAA");
size_t l = strlen("ssh-rsa");
unsigned char *ptr = buf;
*(unsigned int*)ptr = htonl(l);
ptr += 4; blen -= 4;
if (blen < l)
return -1;
memcpy(ptr, "ssh-rsa", l); // HAH!
ptr += l; blen -= l;
unsigned int n = BN_num_bytes(key->e);
if (blen < n+1+4)
return -1;
tmp = new unsigned char [n];
BN_bn2bin(key->e, tmp);
h = (tmp[0] & 0x80) ? 1 : 0;
*(unsigned int*)ptr = htonl(n+h);
ptr += 4; blen -= 4;
*ptr = 0;
memcpy(ptr+h, tmp, n);
ptr += n; blen -= n;
ptr += h; blen -= h;
delete [] tmp;
n = BN_num_bytes(key->n);
if (blen < n+1+4)
return -1;
tmp = new unsigned char [n];
BN_bn2bin(key->n, tmp);
h = (tmp[0] & 0x80) ? 1 : 0;
*(unsigned int*)ptr = htonl(n+h);
ptr += 4; blen -= 4;
*ptr = 0;
memcpy(ptr+h, tmp, n);
ptr += n; blen -= n;
ptr += h; blen -= h;
delete [] tmp;
return ptr-buf;
}
int main(int argc, char **argv)
{
if (argc < 3) {
fprintf(stderr, "Usage: %s <bits> <privfile> <pubfile>\n",
*argv);
return -1;
}
RSA *r;
int bits = atoi(argv[1]);
r = RSA_generate_key(bits, 35, NULL, NULL);
FILE *f = fopen(argv[2], "w");
if (!f)
die("fopen");
PEM_write_RSAPrivateKey(f, r, NULL, NULL, 0, NULL, NULL);
fclose(f);
unsigned char key_string[1024];
char uu_key_string[2049];
memset(uu_key_string, 0, sizeof(uu_key_string));
memset(key_string, 0, sizeof(key_string));
int n = rsa2blob(r, key_string, sizeof(key_string));
printf("%d\n", n);
if (n < 0)
die("Not enough memory to store key.");
b64_ntop(key_string, n, uu_key_string, 2*n);
f = fopen(argv[3], "w");
if (!f)
die("fopen");
fprintf(f, "ssh-rsa %s icke@dort\n", uu_key_string);
fclose(f);
return 0;
}
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