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Document that HMAC() with a NULL md is not thread safe

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Fixes #3541

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3553)
This commit is contained in:
Matt Caswell 2017-05-25 15:18:22 +01:00
parent 867a917032
commit 47695810b3
1 changed files with 2 additions and 1 deletions
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doc/man3/HMAC.pod
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@ -60,7 +60,8 @@ B<key_len> bytes long.
It places the result in B<md> (which must have space for the output of
the hash function, which is no more than B<EVP_MAX_MD_SIZE> bytes).
If B<md> is NULL, the digest is placed in a static array. The size of
the output is placed in B<md_len>, unless it is B<NULL>.
the output is placed in B<md_len>, unless it is B<NULL>. Note: passing a NULL
value for B<md> to use the static array is not thread safe.
B<evp_md> can be EVP_sha1(), EVP_ripemd160() etc.