b2i_PVK_bio, b2i_PVK_bio_ex, i2b_PVK_bio, i2b_PVK_bio_ex - Decode and encode functions for reading and

       Copyright 2021 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                               B2I_PVK_BIO_EX(3SSL)

b2i_PVK_bio_ex() decodes a private key of MSBLOB format read from a BIO. It attempts to automatically
       determine the key type. If the key is encrypted then cb is called with the user data u in order to obtain
       a password to decrypt the key. The supplied library context libctx and property query string propq are
       used in any decrypt operation.

       b2i_PVK_bio() does the same as b2i_PVK_bio_ex() except that the default library context and property
       query string are used.

       i2b_PVK_bio_ex() encodes pk using MSBLOB format. If enclevel is 1 then a password obtained via
       pem_password_cb is used to encrypt the private key.  If enclevel is 0 then no encryption is applied. The
       user data in u is passed to the password callback. The supplied library context libctx and property query
       string propq are used in any decrypt operation.

       i2b_PVK_bio() does the same as i2b_PVK_bio_ex() except that the default library context and property
       query string are used.

b2i_PVK_bio_ex() and i2b_PVK_bio_ex() were added in OpenSSL 3.0.

       b2i_PVK_bio, b2i_PVK_bio_ex, i2b_PVK_bio, i2b_PVK_bio_ex - Decode and encode functions for reading and
       writing MSBLOB format private keys

       The b2i_PVK_bio() and b2i_PVK_bio_ex() functions return a valid EVP_KEY structure or NULL if an error
       occurs. The error code can be obtained by calling ERR_get_error(3).

       i2b_PVK_bio() and i2b_PVK_bio_ex() return the number of bytes successfully encoded or a negative value if
       an error occurs. The error code can be obtained by calling ERR_get_error(3).

crypto(7), d2i_PKCS8PrivateKey_bio(3)

        #include <openssl/pem.h>

        EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u);
        EVP_PKEY *b2i_PVK_bio_ex(BIO *in, pem_password_cb *cb, void *u,
                                 OSSL_LIB_CTX *libctx, const char *propq);
        int i2b_PVK_bio(BIO *out, const EVP_PKEY *pk, int enclevel,
                        pem_password_cb *cb, void *u);
        int i2b_PVK_bio_ex(BIO *out, const EVP_PKEY *pk, int enclevel,
                           pem_password_cb *cb, void *u,
                           OSSL_LIB_CTX *libctx, const char *propq);