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Merge bitcoin-core/secp256k1#1205: field: Improve docs +tests of secp256k1_fe_set_b32

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162da73e9a tests: Add debug helper for printing buffers (Tim Ruffing)
e9fd3dff76 field: Improve docs and tests of secp256k1_fe_set_b32 (Tim Ruffing)
ca92a35d01 field: Simplify code in secp256k1_fe_set_b32 (Tim Ruffing)
d93f62e369 field: Verify field element even after secp256k1_fe_set_b32 fails (Tim Ruffing)

Pull request description:

ACKs for top commit:
  jonasnick:
    ACK 162da73e9a

Tree-SHA512: b3ed8e45c969d0420275ff154462f3820b72b57832ccba1f6f427e0cfd9cff3e27440c20994f69ea33a576b1903eb7f04a989f0dbd574bbd96ee56c6dd4500f7
This commit is contained in:
Jonas Nick
2023-04-21 16:22:53 +00:00
parent f6bef03c0a 162da73e9a
commit 1f33bb2b1c
4 changed files with 90 additions and 13 deletions
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8
src/field_10x26_impl.h
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@@ -367,12 +367,8 @@ static int secp256k1_fe_set_b32(secp256k1_fe *r, const unsigned char *a) {
ret = !((r->n[9] == 0x3FFFFFUL) & ((r->n[8] & r->n[7] & r->n[6] & r->n[5] & r->n[4] & r->n[3] & r->n[2]) == 0x3FFFFFFUL) & ((r->n[1] + 0x40UL + ((r->n[0] + 0x3D1UL) >> 26)) > 0x3FFFFFFUL));
#ifdef VERIFY
r->magnitude = 1;
if (ret) {
r->normalized = 1;
secp256k1_fe_verify(r);
} else {
r->normalized = 0;
}
r->normalized = ret;
secp256k1_fe_verify(r);
#endif
return ret;
}