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Added checks for tx keys

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SChernykh
2021-08-31 17:23:20 +02:00
parent 0558cdb9cc
commit 780afd84a2
9 changed files with 66 additions and 16 deletions
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21
src/crypto.cpp
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@@ -84,10 +84,7 @@ void generate_keys(hash& pub, hash& sec)
static constexpr uint8_t limit[32] = { 0xe3, 0x6a, 0x67, 0x72, 0x8b, 0xce, 0x13, 0x29, 0x8f, 0x30, 0x82, 0x8c, 0x0b, 0xa4, 0x10, 0x39, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0 };
do {
randomBytes(sec.h);
if (!less32(sec.h, limit)) {
continue;
}
do { randomBytes(sec.h); } while (!less32(sec.h, limit));
sc_reduce32(sec.h);
} while (!sc_isnonzero(sec.h));
@@ -96,6 +93,22 @@ void generate_keys(hash& pub, hash& sec)
ge_p3_tobytes(pub.h, &point);
}
bool check_keys(const hash& pub, const hash& sec)
{
// From ge_scalarmult_base's comment: "preconditions a[31] <= 127"
if (sec.h[HASH_SIZE - 1] > 127) {
return false;
}
ge_p3 point;
ge_scalarmult_base(&point, sec.h);
hash pub_check;
ge_p3_tobytes(pub_check.h, &point);
return pub == pub_check;
}
bool generate_key_derivation(const hash& key1, const hash& key2, hash& derivation)
{
ge_p3 point;