[#PBKDF2PARAM_st-prf]
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Pseudorandom function AlgorithmIdentifier (defaults to HMAC&hyphen;SHA1 when absent)&period;

== Synopsis

Declared in `&lt;openssl&sol;x509&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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xref:X509_ALGOR.adoc[X509&lowbar;ALGOR]* prf;
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