diff options
Diffstat (limited to 'testsuite/ecdsa-keygen-test.c')
-rw-r--r-- | testsuite/ecdsa-keygen-test.c | 73 |
1 files changed, 1 insertions, 72 deletions
diff --git a/testsuite/ecdsa-keygen-test.c b/testsuite/ecdsa-keygen-test.c index 2e1b7caa..f2837ea8 100644 --- a/testsuite/ecdsa-keygen-test.c +++ b/testsuite/ecdsa-keygen-test.c @@ -1,77 +1,6 @@ #include "testutils.h" #include "knuth-lfib.h" -/* Check if y^2 = x^3 - 3x + b */ -static int -ecc_valid_p (struct ecc_point *pub) -{ - mpz_t t, x, y; - mpz_t lhs, rhs; - int res; - mp_size_t size; - - size = pub->ecc->p.size; - - /* First check range */ - if (mpn_cmp (pub->p, pub->ecc->p.m, size) >= 0 - || mpn_cmp (pub->p + size, pub->ecc->p.m, size) >= 0) - return 0; - - mpz_init (lhs); - mpz_init (rhs); - - mpz_roinit_n (x, pub->p, size); - mpz_roinit_n (y, pub->p + size, size); - - mpz_mul (lhs, y, y); - - if (pub->ecc->p.bit_size == 255) - { - /* Check that - 121666 (1 + x^2 - y^2) = 121665 x^2 y^2 */ - mpz_t x2; - mpz_init (x2); - mpz_mul (x2, x, x); /* x^2 */ - mpz_mul (rhs, x2, lhs); /* x^2 y^2 */ - mpz_sub (lhs, x2, lhs); /* x^2 - y^2 */ - mpz_add_ui (lhs, lhs, 1); /* 1 + x^2 - y^2 */ - mpz_mul_ui (lhs, lhs, 121666); - mpz_mul_ui (rhs, rhs, 121665); - - 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 */ - mpz_mul (rhs, x, x); - mpz_sub_ui (rhs, rhs, 3); - mpz_mul (rhs, rhs, x); - mpz_add (rhs, rhs, mpz_roinit_n (t, pub->ecc->b, size)); - } - res = mpz_congruent_p (lhs, rhs, mpz_roinit_n (t, pub->ecc->p.m, size)); - - mpz_clear (lhs); - mpz_clear (rhs); - - return res; -} - void test_main (void) { @@ -118,7 +47,7 @@ test_main (void) write_mpn (stderr, 16, key.p, ecc->p.size); fprintf (stderr, "\n"); } - if (!ecc_valid_p (&pub)) + if (!test_ecc_point_valid_p (&pub)) die ("ecdsa_generate_keypair produced an invalid point.\n"); ecdsa_sign (&key, |