[#PKCS8_pkey_get0]
= PKCS8_pkey_get0
:mrdocs:

Extract algorithm and private‐key octets from a PKCS#8 PrivateKeyInfo.

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PKCS8_pkey_get0(
    xref:ASN1_OBJECT.adoc[ASN1_OBJECT] const** ppkalg,
    unsigned char const** pk,
    int* ppklen,
    xref:X509_ALGOR.adoc[X509_ALGOR] const** pa,
    xref:PKCS8_PRIV_KEY_INFO.adoc[PKCS8_PRIV_KEY_INFO] const* p8);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ppkalg*
| Receives the algorithm OID, or NULL to skip.
| *pk*
| Receives a pointer to the private‐key bit string octets, or NULL to skip.
| *ppklen*
| Receives the length of *`pk,` or NULL to skip.
| *pa*
| Receives the AlgorithmIdentifier, or NULL to skip.
| *p8*
| PKCS#8 structure to query.
|===


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