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Documentation improvements for EVP_DigestInit_ex and related functions

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Documenting when EVP_MD_CTX_reset() is implicitly called and when
type can be set to NULL.

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/13402)
This commit is contained in:
Tomas Mraz 2020-11-18 16:22:08 +01:00
parent 5de9863bf3
commit 2b407d0508
1 changed files with 8 additions and 3 deletions
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11
doc/man3/EVP_DigestInit.pod
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@ -208,6 +208,10 @@ value explicitly fetched with EVP_MD_fetch().
If I<impl> is non-NULL, its implementation of the digest I<type> is used if
there is one, and if not, the default implementation is used.
The I<type> parameter can be NULL if I<ctx> has been already initialized
with another EVP_DigestInit_ex() call and has not been reset with
EVP_MD_CTX_reset().
=item EVP_DigestUpdate()
Hashes I<cnt> bytes of data at I<d> into the digest context I<ctx>. This
@ -239,12 +243,13 @@ few bytes.
=item EVP_DigestInit()
Behaves in the same way as EVP_DigestInit_ex() except it always uses the
default digest implementation and calls EVP_MD_CTX_reset().
default digest implementation and calls EVP_MD_CTX_reset() so it cannot
be used with an I<type> of NULL.
=item EVP_DigestFinal()
Similar to EVP_DigestFinal_ex() except the digest context I<ctx> is
automatically cleaned up.
Similar to EVP_DigestFinal_ex() except after computing the digest
the digest context I<ctx> is automatically cleaned up with EVP_MD_CTX_reset().
=item EVP_MD_CTX_copy()