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Document that HMAC() with a NULL md is not thread safe (1.0.2) #3555

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Document that HMAC() with a NULL md is not thread safe (1.0.2) #3555

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3 changes: 2 additions & 1 deletion doc/crypto/hmac.pod
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Expand Up @@ -38,7 +38,8 @@ 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.

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