int cp_pss_sig(g1_t a, g1_t b, uint8_t *msg, int len, bn_t r, bn_t s) {
bn_t m, n;
int result = RLC_OK;
bn_null(m);
bn_null(n);
TRY {
bn_new(m);
bn_new(n);
g1_get_ord(n);
bn_read_bin(m, msg, len);
bn_mul(m, m, s);
bn_mod(m, m, n);
bn_add(m, m, r);
bn_mod(m, m, n);
g1_rand(a);
g1_mul(b, a, m);
}
CATCH_ANY {
result = RLC_ERR;
}
FINALLY {
bn_free(m);
bn_free(n);
}
return result;
}
status_t element_random(element_t e)
{
if(e->isInitialized == TRUE) {
if(e->type == ZR) {
bn_t n;
bn_inits(n);
g1_get_ord(n);
bn_t t = e->bn;
bn_rand(t, BN_POS, bn_bits(n));
bn_mod(t, t, n);
bn_free(n);
}
else if(e->type == G1) {
g1_rand(e->g1);
}
else if(e->type == G2) {
g2_rand(e->g2);
}
else if(e->type == GT) {
gt_rand(e->gt);
}
return ELEMENT_OK;
}
return ELEMENT_UNINITIALIZED;
}
int cp_psb_sig(g1_t a, g1_t b, uint8_t *msgs[], int lens[], bn_t r, bn_t s[],
int l) {
bn_t m, n, t;
int i, result = RLC_OK;
bn_null(m);
bn_null(n);
bn_null(t);
TRY {
bn_new(m);
bn_new(n);
bn_new(t);
/* Choose random a in G1. */
g1_rand(a);
/* Compute b = a^x+\sum y_im_i. */
g1_get_ord(n);
bn_copy(t, r);
for (i = 0; i < l; i++) {
bn_read_bin(m, msgs[i], lens[i]);
bn_mod(m, m, n);
bn_mul(m, m, s[i]);
bn_mod(m, m, n);
bn_add(t, t, m);
bn_mod(t, t, n);
}
g1_mul(b, a, t);
}
CATCH_ANY {
result = RLC_ERR;
}
FINALLY {
bn_free(m);
bn_free(n);
bn_free(t);
}
return result;
}