Commit 47dffbfb authored by Niels Möller's avatar Niels Möller

eccdata: For curve25519, output the Edwards curve constant.

parent b416f90d
2014-07-14 Niels Möller <nisse@lysator.liu.se>
* eccdata.c: For curve25519, output the Edwards curve constant,
ecc_d = (121665/121666) mod p.
* testsuite/curve25519-dup-test.c (test_main): Add test for 4g.
Delete some left-over debug output.
......
......@@ -80,6 +80,7 @@ struct ecc_curve
v = (x-1) / (x+1)
*/
int use_edwards;
mpz_t d;
mpz_t t;
/* Table for pippenger's algorithm.
......@@ -316,7 +317,7 @@ static void
ecc_curve_init_str (struct ecc_curve *ecc, enum ecc_type type,
const char *p, const char *b, const char *q,
const char *gx, const char *gy,
const char *t)
const char *d, const char *t)
{
ecc->type = type;
......@@ -332,11 +333,15 @@ ecc_curve_init_str (struct ecc_curve *ecc, enum ecc_type type,
ecc->ref = NULL;
mpz_init (ecc->d);
mpz_init (ecc->t);
ecc->use_edwards = (t != NULL);
if (ecc->use_edwards)
{
mpz_set_str (ecc->t, t, 16);
mpz_set_str (ecc->d, d, 16);
}
}
static void
......@@ -361,7 +366,7 @@ ecc_curve_init (struct ecc_curve *ecc, unsigned bit_size)
"07192b95ffc8da78631011ed6b24cdd5"
"73f977a11e794811",
NULL);
NULL, NULL);
ecc->ref = ecc_alloc (3);
ecc_set_str (&ecc->ref[0], /* 2 g */
"dafebf5828783f2ad35534631588a3f629a70fb16982a888",
......@@ -393,7 +398,7 @@ ecc_curve_init (struct ecc_curve *ecc, unsigned bit_size)
"bd376388b5f723fb4c22dfe6cd4375a0"
"5a07476444d5819985007e34",
NULL);
NULL, NULL);
ecc->ref = ecc_alloc (3);
ecc_set_str (&ecc->ref[0], /* 2 g */
......@@ -426,7 +431,7 @@ ecc_curve_init (struct ecc_curve *ecc, unsigned bit_size)
"4FE342E2FE1A7F9B8EE7EB4A7C0F9E16"
"2BCE33576B315ECECBB6406837BF51F5",
NULL);
NULL, NULL);
ecc->ref = ecc_alloc (3);
ecc_set_str (&ecc->ref[0], /* 2 g */
......@@ -464,7 +469,7 @@ ecc_curve_init (struct ecc_curve *ecc, unsigned bit_size)
"3617de4a96262c6f5d9e98bf9292dc29"
"f8f41dbd289a147ce9da3113b5f0b8c0"
"0a60b1ce1d7e819d7a431d7c90ea0e5f",
NULL);
NULL, NULL);
ecc->ref = ecc_alloc (3);
ecc_set_str (&ecc->ref[0], /* 2 g */
......@@ -511,7 +516,7 @@ ecc_curve_init (struct ecc_curve *ecc, unsigned bit_size)
"98f54449579b446817afbd17273e662c"
"97ee72995ef42640c550b9013fad0761"
"353c7086a272c24088be94769fd16650",
NULL);
NULL, NULL);
ecc->ref = ecc_alloc (3);
ecc_set_str (&ecc->ref[0], /* 2 g */
......@@ -565,6 +570,11 @@ ecc_curve_init (struct ecc_curve *ecc, unsigned bit_size)
*/
"20ae19a1b8a086b4e01edd2c7748d14c"
"923d4d7e6d7c61b229e9c5a27eced3d9",
/* (121665/121666) mod p, from PARI/GP
c = Mod(121665, p); c / (c+1)
*/
"2dfc9311d490018c7338bf8688861767"
"ff8ff5b2bebe27548a14b235eca6874a",
/* sqrt(486664) mod p, from PARI/GP
sqrt(Mod(486664, p)) */
"141b0b6806563d503de05885280b5910"
......@@ -930,6 +940,8 @@ output_curve (const struct ecc_curve *ecc, unsigned bits_per_limb)
output_bignum ("ecc_p", ecc->p, limb_size, bits_per_limb);
output_bignum ("ecc_b", ecc->b, limb_size, bits_per_limb);
if (ecc->use_edwards)
output_bignum ("ecc_d", ecc->d, limb_size, bits_per_limb);
output_bignum ("ecc_q", ecc->q, limb_size, bits_per_limb);
output_point ("ecc_g", ecc, &ecc->g, 0, limb_size, bits_per_limb);
output_point ("ecc_redc_g", ecc, &ecc->g, 1, limb_size, bits_per_limb);
......
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