frost/secp256k1-zkp
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Add bounds checking to field element setters

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This commit is contained in:
Pieter Wuille
2014-11-24 12:38:05 +01:00
parent bb2cd94e09
commit d907ebc0e3
10 changed files with 37 additions and 24 deletions
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8
src/eckey_impl.h
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@@ -17,12 +17,12 @@
static int secp256k1_eckey_pubkey_parse(secp256k1_ge_t *elem, const unsigned char *pub, int size) {
if (size == 33 && (pub[0] == 0x02 || pub[0] == 0x03)) {
secp256k1_fe_t x;
secp256k1_fe_set_b32(&x, pub+1);
return secp256k1_ge_set_xo(elem, &x, pub[0] == 0x03);
return secp256k1_fe_set_b32(&x, pub+1) && secp256k1_ge_set_xo(elem, &x, pub[0] == 0x03);
} else if (size == 65 && (pub[0] == 0x04 || pub[0] == 0x06 || pub[0] == 0x07)) {
secp256k1_fe_t x, y;
secp256k1_fe_set_b32(&x, pub+1);
secp256k1_fe_set_b32(&y, pub+33);
if (!secp256k1_fe_set_b32(&x, pub+1) || !secp256k1_fe_set_b32(&y, pub+33)) {
return 0;
}
secp256k1_ge_set_xy(elem, &x, &y);
if ((pub[0] == 0x06 || pub[0] == 0x07) && secp256k1_fe_is_odd(&y) != (pub[0] == 0x07))
return 0;