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Clarify BN_mod_exp docs

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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/6137)
This commit is contained in:
Matt Caswell 2018-04-30 15:05:45 +01:00
parent ecd4b8fe85
commit 3a070e255f
1 changed files with 3 additions and 1 deletions
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doc/man3/BN_add.pod
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@ -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