diff options
Diffstat (limited to 'testsuite/ecdsa-keygen-test.c')
| -rw-r--r-- | testsuite/ecdsa-keygen-test.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/testsuite/ecdsa-keygen-test.c b/testsuite/ecdsa-keygen-test.c index a96c09ef..cd96782e 100644 --- a/testsuite/ecdsa-keygen-test.c +++ b/testsuite/ecdsa-keygen-test.c @@ -40,6 +40,22 @@ ecc_valid_p (struct ecc_point *pub) mpz_clear (x2); } + else if (pub->ecc->p.bit_size == 448) + { + /* Check that + x^2 + y^2 = 1 - 39081 x^2 y^2 */ + mpz_t x2, d; + mpz_init (x2); + mpz_init_set_ui (d, 39081); + mpz_mul (x2, x, x); /* x^2 */ + mpz_mul (d, d, x2); /* 39081 x^2 */ + mpz_set_ui (rhs, 1); + mpz_submul (rhs, d, lhs); /* 1 - 39081 x^2 y^2 */ + mpz_add (lhs, x2, lhs); /* x^2 + y^2 */ + + mpz_clear (d); + mpz_clear (x2); + } else { /* Check y^2 = x^3 - 3 x + b */ |