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doc: EVP_PKEY_get_utf8/octet_string_param() clarify NULL buffer behavior 

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/16843)

(cherry picked from commit cde5a12d5e)
This commit is contained in:
Tomas Mraz 2021-10-15 14:50:17 +02:00
parent d86d703711
commit d9f8032ea6
1 changed files with 5 additions and 1 deletions
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6
doc/man3/EVP_PKEY_gettable_params.pod
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@ -52,11 +52,15 @@ buffer I<str> of maximum size I<max_buf_sz> associated with a name of
I<key_name>. The maximum size must be large enough to accomodate the string
value including a terminating NUL byte, or this function will fail.
If I<out_len> is not NULL, I<*out_len> is set to the length of the string
not including the terminating NUL byte.
not including the terminating NUL byte. The required buffer size not including
the terminating NUL byte can be obtained from I<*out_len> by calling the
function with I<str> set to NULL.
EVP_PKEY_get_octet_string_param() get a key I<pkey>'s octet string value into a
buffer I<buf> of maximum size I<max_buf_sz> associated with a name of I<key_name>.
If I<out_len> is not NULL, I<*out_len> is set to the length of the contents.
The required buffer size can be obtained from I<*out_len> by calling the
function with I<buf> set to NULL.
=head1 NOTES