d2i_PKCS8PrivateKey_bio, d2i_PKCS8PrivateKey_fp, i2d_PKCS8PrivateKey_bio, i2d_PKCS8PrivateKey_fp,

Copyright

       Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                      D2I_PKCS8PRIVATEKEY_BIO(3SSL)

Description

       The PKCS#8 functions encode and decode private keys in PKCS#8 format using both PKCS#5 v1.5 and PKCS#5
       v2.0 password based encryption algorithms.

       Other than the use of DER as opposed to PEM these functions are identical to the corresponding PEM
       function as described in PEM_read_PrivateKey(3).

Name

       d2i_PKCS8PrivateKey_bio, d2i_PKCS8PrivateKey_fp, i2d_PKCS8PrivateKey_bio, i2d_PKCS8PrivateKey_fp,
       i2d_PKCS8PrivateKey_nid_bio, i2d_PKCS8PrivateKey_nid_fp - PKCS#8 format private key functions

Notes

       These functions are currently the only way to store encrypted private keys using DER format.

       Currently all the functions use BIOs or FILE pointers, there are no functions which work directly on
       memory: this can be readily worked around by converting the buffers to memory BIOs, see BIO_s_mem(3) for
       details.

       These functions make no assumption regarding the pass phrase received from the password callback.  It
       will simply be treated as a byte sequence.

Return Values

d2i_PKCS8PrivateKey_bio() and d2i_PKCS8PrivateKey_fp() return a valid EVP_PKEY structure or NULL if an
       error occurred.

       i2d_PKCS8PrivateKey_bio(), i2d_PKCS8PrivateKey_fp(), i2d_PKCS8PrivateKey_nid_bio() and
       i2d_PKCS8PrivateKey_nid_fp() return 1 on success or 0 on error.

Synopsis

        #include <openssl/pem.h>

        EVP_PKEY *d2i_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u);
        EVP_PKEY *d2i_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u);

        int i2d_PKCS8PrivateKey_bio(BIO *bp, const EVP_PKEY *x, const EVP_CIPHER *enc,
                                    char *kstr, int klen,
                                    pem_password_cb *cb, void *u);

        int i2d_PKCS8PrivateKey_fp(FILE *fp, const EVP_PKEY *x, const EVP_CIPHER *enc,
                                   char *kstr, int klen,
                                   pem_password_cb *cb, void *u);

        int i2d_PKCS8PrivateKey_nid_bio(BIO *bp, const EVP_PKEY *x, int nid,
                                        char *kstr, int klen,
                                        pem_password_cb *cb, void *u);

        int i2d_PKCS8PrivateKey_nid_fp(FILE *fp, const EVP_PKEY *x, int nid,
                                       char *kstr, int klen,
                                       pem_password_cb *cb, void *u);