diff options
| author | Matt Caswell <matt@openssl.org> | 2017-05-25 15:18:22 +0100 |
|---|---|---|
| committer | Matt Caswell <matt@openssl.org> | 2017-05-25 15:34:30 +0100 |
| commit | 47695810b3bea3e83e8bc2266e1672676a189efd (patch) | |
| tree | a285e15faf4257b2149a9318938ed7c1bcac9e34 /doc | |
| parent | 867a917032e3eaff7b13d5f68063997f27ca26aa (diff) | |
Document that HMAC() with a NULL md is not thread safe
Fixes #3541
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3553)
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/man3/HMAC.pod | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/man3/HMAC.pod b/doc/man3/HMAC.pod index 42f0bfd304..ad7aaeb099 100644 --- a/doc/man3/HMAC.pod +++ b/doc/man3/HMAC.pod @@ -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. |