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| author | Matt Caswell <matt@openssl.org> | 2018-04-30 15:05:45 +0100 |
|---|---|---|
| committer | Matt Caswell <matt@openssl.org> | 2018-05-01 14:25:35 +0100 |
| commit | 966b3df182b9c8644c154f1c3e686027d37acb05 (patch) | |
| tree | 1e79a3099ae7ec4f0d72c615edd5ead881066502 /doc/crypto | |
| parent | bbb88edeb6e2654cf0fabb88a31f23bee9632b03 (diff) | |
Clarify BN_mod_exp docs
Specifically this is not supported with an even modulus and
BN_FLG_CONSTTIME.
Fixes #5082
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6138)
Diffstat (limited to 'doc/crypto')
| -rw-r--r-- | doc/crypto/BN_add.pod | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/crypto/BN_add.pod b/doc/crypto/BN_add.pod index db3b0d45b4..418a6d7f9a 100644 --- a/doc/crypto/BN_add.pod +++ b/doc/crypto/BN_add.pod @@ -92,7 +92,9 @@ BN_exp() raises I<a> to the I<p>-th power and places the result in I<r> BN_mul(). BN_mod_exp() computes I<a> to the I<p>-th power modulo I<m> (C<r=a^p % -m>). This function uses less time and space than BN_exp(). +m>). This function uses less time and space than BN_exp(). Do not call this +function when B<m> is even and any of the parameters have the +B<BN_FLG_CONSTTIME> flag set. BN_gcd() computes the greatest common divisor of I<a> and I<b> and places the result in I<r>. I<r> may be the same B<BIGNUM> as I<a> or |