int ecdsa_set_curve(u32 type)
{
if (ecdsa_get_params(type, ec_p, ec_a, ec_b, ec_N, ec_G.x, ec_G.y) < 0)
return -1;
bn_to_mon(ec_a, ec_p, 20);
bn_to_mon(ec_b, ec_p, 20);
point_to_mon(&ec_G);
return 0;
}
int ecdsa_set_curve(u32 type)
{
if (ecdsa_get_params(type, ec_p, ec_a, ec_b, ec_N, ec_G.x, ec_G.y) < 0)
return -1;
bn_print("p", ec_p, 20);
bn_print("a", ec_a, 20);
bn_print("b", ec_b, 20);
bn_print("N", ec_N, 21);
bn_print("Gx", ec_G.x, 20);
bn_print("Gy", ec_G.y, 20);
bn_to_mon(ec_a, ec_p, 20);
bn_to_mon(ec_b, ec_p, 20);
point_to_mon(&ec_G);
return 0;
}
int main(int argc, char *argv[])
{
if (argc != 3)
fail("usage: scesekrit signedfile1 signedfile2");
ptr1 = mmap_file(argv[1]);
ptr2 = mmap_file(argv[2]);
type = be16(ptr1 + 0x0a);
if (type != be16(ptr2 + 0x0a))
fail("Files must be the same type");
if (type == 1) {
read_self_header(ptr1, &info1);
} else if(type == 3) {
read_pkg_header(ptr1, &info1);
} else
fail("Unknown type: %d", type);
if ((info1.flags) & 0x8000)
fail("devkit file; nothing to verify");
if (klist == NULL)
fail("no key found");
decrypt(ptr1);
if (type == 1) {
read_self_header(ptr2, &info2);
} else if(type == 3) {
read_pkg_header(ptr2, &info2);
} else
fail("Unknown type: %d", type);
if ((info2.flags) & 0x8000)
fail("devkit file; nothing to verify");
if (klist == NULL)
fail("no key found");
decrypt(ptr2);
u8* s1;
u8* s2;
u8 z1[21];
u8 z2[21];
u8* r1;
u8* r2;
u8 ec[21];
u8 n[21];
z1[0] = 0;
z2[0] = 0;
ecdsa_get_params(klist->keys[keyid].ctype, ec, ec, ec, n, ec, ec);
printf("%s ", argv[1]);
verify_signature(ptr1, &info1, z1 + 1, &s1, &r1);
printf("%s ", argv[2]);
verify_signature(ptr2, &info2, z2 + 1, &s2, &r2);
if (memcmp(r1, r2, 21))
fail("Both files must share the same r signature value.");
const char* dA = calculate_private_key(s1, s2, z1, z2, n, r1);
int len = strlen(dA);
int i;
printf("Private Key: ");
for (i = len / 2; i < 21; i++)
printf("00");
printf("%s\n", dA);
return 0;
}