Write a private key to a BIO as PEM with an explicit library context.

Synopsis

Declared in <openssl/pem.h>

int
PEM_write_bio_PrivateKey_ex(
    BIO* bp,
    EVP_PKEY const* x,
    EVP_CIPHER const* enc,
    unsigned char const* kstr,
    int klen,
    pem_password_cb* cb,
    void* u,
    OSSL_LIB_CTX* libctx,
    char const* propq);

Return Value

1 on success, or 0 on failure.

Parameters

Name

Description

bp

BIO to write to.

x

Private key to encode.

enc

Cipher for PKCS#8 encryption, or NULL for unencrypted PrivateKeyInfo.

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.

libctx

Library context used for provider‐backed encoding, or NULL for the default.

propq

Property query for algorithm fetches, or NULL.

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