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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6
src/field_impl.h
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@@ -41,7 +41,7 @@ static void secp256k1_fe_get_hex(char *r, int *rlen, const secp256k1_fe_t *a) {
r[64] = 0x00;
}
static void secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a, int alen) {
static int secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a, int alen) {
unsigned char tmp[32] = {};
static const int cvt[256] = {0, 0, 0, 0, 0, 0, 0,0,0,0,0,0,0,0,0,0,
0, 0, 0, 0, 0, 0, 0,0,0,0,0,0,0,0,0,0,
@@ -63,7 +63,7 @@ static void secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a, int alen) {
if (alen > i*2)
tmp[32 - alen/2 + i] = (cvt[(unsigned char)a[2*i]] << 4) + cvt[(unsigned char)a[2*i+1]];
}
secp256k1_fe_set_b32(r, tmp);
return secp256k1_fe_set_b32(r, tmp);
}
static int secp256k1_fe_sqrt(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
@@ -212,7 +212,7 @@ static void secp256k1_fe_inv_var(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
secp256k1_num_set_bin(&n, b, 32);
secp256k1_num_mod_inverse(&n, &n, &secp256k1_fe_consts->p);
secp256k1_num_get_bin(b, 32, &n);
secp256k1_fe_set_b32(r, b);
VERIFY_CHECK(secp256k1_fe_set_b32(r, b));
#else
#error "Please select field inverse implementation"
#endif