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| author | jsing <> | 2023-01-31 05:16:52 +0000 |
|---|---|---|
| committer | jsing <> | 2023-01-31 05:16:52 +0000 |
| commit | 4fa795073d8bd6eef6356b0a3cee6eaa70c93988 (patch) | |
| tree | 89342ff559044bab73963cc74c1c24831e4c6592 /src/lib/libcrypto/dsa/dsa_lib.c | |
| parent | f778e2dfb38549abc1d2b20ea58318a0056beca0 (diff) | |
| download | openbsd-4fa795073d8bd6eef6356b0a3cee6eaa70c93988.tar.gz openbsd-4fa795073d8bd6eef6356b0a3cee6eaa70c93988.tar.bz2 openbsd-4fa795073d8bd6eef6356b0a3cee6eaa70c93988.zip | |
Correctly detect b < a in BN_usub().
BN_usub() requires that a >= b and should return an error in the case that
b < a. This is currently only detected by checking the number of words in
a versus b - if they have the same number of words, the top word is not
checked and b < a, which then succeeds and produces an incorrect result.
Fix this by checking for the case where a and b have an equal number of
words, yet there is a borrow returned from bn_sub_words().
ok miod@ tb@
Diffstat (limited to 'src/lib/libcrypto/dsa/dsa_lib.c')
0 files changed, 0 insertions, 0 deletions