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ringct: error out when hashToPoint* returns the point at infinity
Reported by QuarksLab.
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d1591853bf
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@ -130,7 +130,9 @@ static rct::key get_exponent(const rct::key &base, size_t idx)
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{
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static const std::string salt("bulletproof");
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std::string hashed = std::string((const char*)base.bytes, sizeof(base)) + salt + tools::get_varint_data(idx);
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return rct::hashToPoint(rct::hash2rct(crypto::cn_fast_hash(hashed.data(), hashed.size())));
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const rct::key e = rct::hashToPoint(rct::hash2rct(crypto::cn_fast_hash(hashed.data(), hashed.size())));
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CHECK_AND_ASSERT_THROW_MES(!(e == rct::identity()), "Exponent is point at infinity");
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return e;
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}
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static void init_exponents()
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@ -277,6 +277,7 @@ namespace rct {
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for (j = 0; j < dsRows; j++) {
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addKeys2(L, rv.ss[i][j], c_old, pk[i][j]);
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hashToPoint(Hi, pk[i][j]);
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CHECK_AND_ASSERT_MES(!(Hi == rct::identity()), false, "Data hashed to point at infinity");
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addKeys3(R, rv.ss[i][j], Hi, c_old, Ip[j].k);
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toHash[3 * j + 1] = pk[i][j];
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toHash[3 * j + 2] = L;
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