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Speed up crypto derivations with vartime ops

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Implemented ge_scalarmult_vartime (a*B) and ge_scalarmult_base_vartime (a*G). These come from libsodium code as the rest of crypto-ops.c
This commit is contained in:
WeebDataHoarder
2025-09-29 13:19:51 +02:00
committed by SChernykh
parent 7cb6a0dcc3
commit 22cabb5ac9
3 changed files with 113 additions and 5 deletions
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10
src/crypto.cpp
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@@ -89,7 +89,7 @@ void generate_keys(hash& pub, hash& sec)
} while (!sc_isnonzero(sec.h));
ge_p3 point;
ge_scalarmult_base(&point, sec.h);
ge_scalarmult_base_vartime(&point, sec.h);
ge_p3_tobytes(pub.h, &point);
}
@@ -113,7 +113,7 @@ void generate_keys_deterministic(hash& pub, hash& sec, const uint8_t* entropy, s
} while (!sc_isnonzero(sec.h));
ge_p3 point;
ge_scalarmult_base(&point, sec.h);
ge_scalarmult_base_vartime(&point, sec.h);
ge_p3_tobytes(pub.h, &point);
}
@@ -125,7 +125,7 @@ bool check_keys(const hash& pub, const hash& sec)
}
ge_p3 point;
ge_scalarmult_base(&point, sec.h);
ge_scalarmult_base_vartime(&point, sec.h);
hash pub_check;
ge_p3_tobytes(pub_check.h, &point);
@@ -206,7 +206,7 @@ public:
return false;
}
ge_scalarmult(&point2, key2.h, &point);
ge_scalarmult_vartime(&point2, key2.h, &point);
ge_mul8(&point3, &point2);
ge_p1p1_to_p2(&point2, &point3);
ge_tobytes(reinterpret_cast<uint8_t*>(&derivation), &point2);
@@ -253,7 +253,7 @@ public:
}
derivation_to_scalar(derivation, output_index, scalar);
ge_scalarmult_base(&point2, reinterpret_cast<uint8_t*>(&scalar));
ge_scalarmult_base_vartime(&point2, reinterpret_cast<uint8_t*>(&scalar));
ge_p3_to_cached(&point3, &point2);
ge_add(&point4, &point1, &point3);
ge_p1p1_to_p2(&point5, &point4);