diff options
Diffstat (limited to 'ecc.c')
| -rw-r--r-- | ecc.c | 46 |
1 files changed, 38 insertions, 8 deletions
@@ -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 = <c_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 = <c_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 = <c_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)); |