mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-01-10 09:58:01 +00:00
42 lines
964 B
C
42 lines
964 B
C
|
/*
|
||
|
|
* EC key generation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "ssh.h"
|
||
|
|
|
||
|
|
/* Forward reference from sshecc.c */
|
||
|
|
struct ec_point *ecp_mul(const struct ec_point *a, const Bignum b);
|
||
|
|
|
||
|
|
int ec_generate(struct ec_key *key, int bits, progfn_t pfn,
|
||
|
|
void *pfnparam)
|
||
|
|
{
|
||
|
|
struct ec_point *publicKey;
|
||
|
|
|
||
|
|
if (bits == 256) {
|
||
|
|
key->publicKey.curve = ec_p256();
|
||
|
|
} else if (bits == 384) {
|
||
|
|
key->publicKey.curve = ec_p384();
|
||
|
|
} else if (bits == 521) {
|
||
|
|
key->publicKey.curve = ec_p521();
|
||
|
|
} else {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
key->privateKey = bignum_random_in_range(One, key->publicKey.curve->n);
|
||
|
|
if (!key->privateKey) return 0;
|
||
|
|
|
||
|
|
publicKey = ecp_mul(&key->publicKey.curve->G, key->privateKey);
|
||
|
|
if (!publicKey) {
|
||
|
|
freebn(key->privateKey);
|
||
|
|
key->privateKey = NULL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
key->publicKey.x = publicKey->x;
|
||
|
|
key->publicKey.y = publicKey->y;
|
||
|
|
key->publicKey.z = NULL;
|
||
|
|
sfree(publicKey);
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|