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ringct: error out when hashToPoint* returns the point at infinity 

Reported by QuarksLab.
This commit is contained in:
moneromooo-monero 2018-07-25 10:10:46 +01:00
parent d1591853bf
commit 7ed496cc78
No known key found for this signature in database
GPG Key ID: 686F07454D6CEFC3
2 changed files with 4 additions and 1 deletions
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4
src/ringct/bulletproofs.cc
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@ -130,7 +130,9 @@ static rct::key get_exponent(const rct::key &base, size_t idx)
{ {
static const std::string salt("bulletproof"); static const std::string salt("bulletproof");
std::string hashed = std::string((const char*)base.bytes, sizeof(base)) + salt + tools::get_varint_data(idx); std::string hashed = std::string((const char*)base.bytes, sizeof(base)) + salt + tools::get_varint_data(idx);
return rct::hashToPoint(rct::hash2rct(crypto::cn_fast_hash(hashed.data(), hashed.size()))); const rct::key e = rct::hashToPoint(rct::hash2rct(crypto::cn_fast_hash(hashed.data(), hashed.size())));
CHECK_AND_ASSERT_THROW_MES(!(e == rct::identity()), "Exponent is point at infinity");
return e;
} }
static void init_exponents() static void init_exponents()

1
src/ringct/rctSigs.cpp
View File

@ -277,6 +277,7 @@ namespace rct {
for (j = 0; j < dsRows; j++) { for (j = 0; j < dsRows; j++) {
addKeys2(L, rv.ss[i][j], c_old, pk[i][j]); addKeys2(L, rv.ss[i][j], c_old, pk[i][j]);
hashToPoint(Hi, pk[i][j]); hashToPoint(Hi, pk[i][j]);
CHECK_AND_ASSERT_MES(!(Hi == rct::identity()), false, "Data hashed to point at infinity");
addKeys3(R, rv.ss[i][j], Hi, c_old, Ip[j].k); addKeys3(R, rv.ss[i][j], Hi, c_old, Ip[j].k);
toHash[3 * j + 1] = pk[i][j]; toHash[3 * j + 1] = pk[i][j];
toHash[3 * j + 2] = L; toHash[3 * j + 2] = L;