/**
* Initialize xmssmt_params struct
* parameter names are the same as in the draft
*
* Especially h is the total tree height, i.e. the XMSS trees have height h/d
*/
int xmssmt_set_params(xmssmt_params *params, int n, int h, int d, int w, int k)
{
if (h % d) {
fprintf(stderr, "d must divide h without remainder!\n");
return 1;
}
params->h = h;
params->d = d;
params->n = n;
params->index_len = (h + 7) / 8;
xmss_params xmss_par;
if (xmss_set_params(&xmss_par, n, (h/d), w, k)) {
return 1;
}
params->xmss_par = xmss_par;
return 0;
}
int
sshkey_xmss_init(struct sshkey *key, const char *name)
{
struct ssh_xmss_state *state;
if (key->xmss_state != NULL)
return SSH_ERR_INVALID_FORMAT;
if (name == NULL)
return SSH_ERR_INVALID_FORMAT;
state = calloc(sizeof(struct ssh_xmss_state), 1);
if (state == NULL)
return SSH_ERR_ALLOC_FAIL;
if (strcmp(name, XMSS_SHA2_256_W16_H10_NAME) == 0) {
state->n = 32;
state->w = 16;
state->h = 10;
} else if (strcmp(name, XMSS_SHA2_256_W16_H16_NAME) == 0) {
state->n = 32;
state->w = 16;
state->h = 16;
} else if (strcmp(name, XMSS_SHA2_256_W16_H20_NAME) == 0) {
state->n = 32;
state->w = 16;
state->h = 20;
} else {
free(state);
return SSH_ERR_KEY_TYPE_UNKNOWN;
}
if ((key->xmss_name = strdup(name)) == NULL) {
free(state);
return SSH_ERR_ALLOC_FAIL;
}
state->k = 2; /* XXX hardcoded */
state->lockfd = -1;
if (xmss_set_params(&state->params, state->n, state->h, state->w,
state->k) != 0) {
free(state);
return SSH_ERR_INVALID_FORMAT;
}
key->xmss_state = state;
return 0;
}