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DOC: Clarify EVP_MAC_init() params vs. EVP_MAC_CTX_set_params()

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Fixes #14855

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14937)
This commit is contained in:
Dr. David von Oheimb 2021-04-20 08:30:47 +02:00 committed by Dr. David von Oheimb
parent 5c42f7aa64
commit c0e724fcbe
1 changed files with 6 additions and 3 deletions
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9
doc/man3/EVP_MAC.pod
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@ -118,12 +118,15 @@ I<ctx>.
=head2 Computing functions
EVP_MAC_init() sets up the underlying context with information given
EVP_MAC_init() sets up the underlying context I<ctx> with information given
via the I<key> and I<params> arguments. The MAC I<key> has a length of
I<keylen> and the parameters in I<params> are processed before setting
the key. If I<key> is NULL, the key must be set via params either
the key. If I<key> is NULL, the key must be set via I<params> either
as part of this call or separately using EVP_MAC_CTX_set_params().
This should be called before calling EVP_MAC_update() and EVP_MAC_final().
Providing non-NULL I<params> to this function is equivalent to calling
EVP_MAC_CTX_set_params() with those I<params> for the same I<ctx> beforehand.
EVP_MAC_init() should be called before EVP_MAC_update() and EVP_MAC_final().
EVP_MAC_update() adds I<datalen> bytes from I<data> to the MAC input.