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Be safer with how we handle ltc_ecc_sets[] (particularly with

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system libtomcrypt)

A bit of progress with ecdsa code

--HG--
branch : ecc
This commit is contained in:
Matt Johnston
2013-04-09 22:44:19 +08:00
parent 7f091e7019
commit 9f01625e23
5 changed files with 100 additions and 17 deletions
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46
ecc.c
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@@ -6,30 +6,60 @@
#ifdef DROPBEAR_ECC
// TODO: use raw bytes for the dp rather than the hex strings in libtomcrypt's ecc.c
// .dp members are filled out by dropbear_ecc_fill_dp() at startup
#ifdef DROPBEAR_ECC_256
const struct dropbear_ecc_curve ecc_curve_nistp256 = {
.dp = &ltc_ecc_sets[0],
struct dropbear_ecc_curve ecc_curve_nistp256 = {
.ltc_size = 32,
.hashdesc = &sha256_desc,
.name = "nistp256"
};
#endif
#ifdef DROPBEAR_ECC_384
const struct dropbear_ecc_curve ecc_curve_nistp384 = {
.dp = &ltc_ecc_sets[1],
struct dropbear_ecc_curve ecc_curve_nistp384 = {
.ltc_size = 48,
.hashdesc = &sha384_desc,
.name = "nistp384"
};
#endif
#ifdef DROPBEAR_ECC_521
const struct dropbear_ecc_curve ecc_curve_nistp521 = {
.dp = &ltc_ecc_sets[2],
struct dropbear_ecc_curve ecc_curve_nistp521 = {
.ltc_size = 66,
.hashdesc = &sha512_desc,
.name = "nistp521"
};
#endif
static ecc_key * new_ecc_key(void) {
struct dropbear_ecc_curve *dropbear_ecc_curves[] = {
#ifdef DROPBEAR_ECC_256
&ecc_curve_nistp256,
#endif
#ifdef DROPBEAR_ECC_384
&ecc_curve_nistp384,
#endif
#ifdef DROPBEAR_ECC_521
&ecc_curve_nistp521,
#endif
NULL
};
void dropbear_ecc_fill_dp() {
struct dropbear_ecc_curve **curve;
// libtomcrypt guarantees they're ordered by size
const ltc_ecc_set_type *dp = ltc_ecc_sets;
for (curve = dropbear_ecc_curves; *curve; curve++) {
for (;dp->size > 0; dp++) {
if (dp->size == (*curve)->ltc_size) {
(*curve)->dp = dp;
break;
}
}
if (!(*curve)->dp) {
dropbear_exit("Missing ECC params %s", (*curve)->name);
}
}
}
ecc_key * new_ecc_key(void) {
ecc_key *key = m_malloc(sizeof(*key));
key->pubkey.x = m_malloc(sizeof(mp_int));
key->pubkey.y = m_malloc(sizeof(mp_int));