[#PEM_write_bio_PrivateKey_traditional]
= PEM_write_bio_PrivateKey_traditional
:mrdocs:

Write a private key to a BIO using the legacy "traditional" PEM private‐key format.

== Synopsis

Declared in `<openssl/pem.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PEM_write_bio_PrivateKey_traditional(
    xref:BIO.adoc[BIO]* bp,
    xref:EVP_PKEY.adoc[EVP_PKEY] const* x,
    xref:EVP_CIPHER-07.adoc[EVP_CIPHER] const* enc,
    unsigned char const* kstr,
    int klen,
    xref:pem_password_cb.adoc[pem_password_cb]* cb,
    void* u);
----

== Description

Prefer PEM_write_bio_PrivateKey() / PKCS#8 for new keys; this exists for legacy compatibility.

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bp*
| BIO to write to.
| *x*
| Private key to encode.
| *enc*
| Optional cipher for traditional PEM encryption, or NULL for cleartext.
| *kstr*
| Optional passphrase bytes; if NULL and `enc` is set, `cb` is used.
| *klen*
| Length of `kstr` when provided.
| *cb*
| Password callback when a passphrase is needed, or NULL.
| *u*
| Application data passed to `cb.`
|===


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