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gpg: Fix gpg_mpi_write for the unused opaque case.

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* g10/build-packet.c (gpg_mpi_write): Take care of the fact that
get_opaque already returns a bit-exact value.
--

Fixes-commit: ab17f7b6c392782718f57eaea94fc18a0ff49389
Reported-by: Falko Strenzke <falko.strenzke@mtg.de>
This commit is contained in:
Werner Koch 2024-02-21 15:55:14 +01:00
parent a09157ccb2
commit 2372f6a403
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GPG Key ID: E3FDFF218E45B72B
1 changed files with 3 additions and 1 deletions
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g10/build-packet.c
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@ -306,7 +306,9 @@ gpg_mpi_write (iobuf_t out, gcry_mpi_t a, unsigned int *r_nwritten)
p = gcry_mpi_get_opaque (a, &nbits); p = gcry_mpi_get_opaque (a, &nbits);
if (p) if (p)
{ {
/* Strip leading zero bits. */ /* First get nbits back to full bytes. */
nbits = ((nbits + 7) / 8) * 8;
/* Then strip leading zero bits. */
for (; nbits >= 8 && !*p; p++, nbits -= 8) for (; nbits >= 8 && !*p; p++, nbits -= 8)
; ;
if (nbits >= 8 && !(*p & 0x80)) if (nbits >= 8 && !(*p & 0x80))