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A bit of debugging output

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--HG--
branch : ecc
This commit is contained in:
Matt Johnston 2013-04-09 22:47:03 +08:00
parent 9f01625e23
commit f842712551
1 changed files with 12 additions and 3 deletions
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15
ecc.c
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@ -142,14 +142,18 @@ ecc_key * buf_get_ecc_raw_pubkey(buffer *buf, const struct dropbear_ecc_curve *c
ecc_key *key = NULL;
int ret = DROPBEAR_FAILURE;
const unsigned int size = curve->dp->size;
unsigned char first;
TRACE(("enter buf_get_ecc_raw_pubkey"))
buf_setpos(buf, 0);
unsigned int len = buf->len;
unsigned char first = buf_getbyte(buf);
first = buf_getbyte(buf);
if (first == 2 || first == 3) {
dropbear_log(LOG_WARNING, "Dropbear doesn't support ECC point compression");
return NULL;
}
if (first != 4 || len != 1+2*size) {
if (first != 4 || buf->len != 1+2*size) {
TRACE(("leave, wrong size"))
return NULL;
}
@ -157,11 +161,13 @@ ecc_key * buf_get_ecc_raw_pubkey(buffer *buf, const struct dropbear_ecc_curve *c
key->dp = curve->dp;
if (mp_read_unsigned_bin(key->pubkey.x, buf_getptr(buf, size), size) != MP_OKAY) {
TRACE(("failed to read x"))
goto out;
}
buf_incrpos(buf, size);
if (mp_read_unsigned_bin(key->pubkey.y, buf_getptr(buf, size), size) != MP_OKAY) {
TRACE(("failed to read y"))
goto out;
}
buf_incrpos(buf, size);
@ -169,14 +175,17 @@ ecc_key * buf_get_ecc_raw_pubkey(buffer *buf, const struct dropbear_ecc_curve *c
mp_set(key->pubkey.z, 1);
if (ecc_is_point(key) != CRYPT_OK) {
TRACE(("failed, not a point"))
goto out;
}
// SEC1 3.2.3.1 Check that Q != 0
if (mp_cmp_d(key->pubkey.x, 0) == LTC_MP_EQ) {
TRACE(("failed, x == 0"))
goto out;
}
if (mp_cmp_d(key->pubkey.y, 0) == LTC_MP_EQ) {
TRACE(("failed, y == 0"))
goto out;
}