PKCS12_key_gen_asc, PKCS12_key_gen_asc_ex, PKCS12_key_gen_uni, PKCS12_key_gen_uni_ex,

       IETF RFC 7292 (<https://tools.ietf.org/html/rfc7292>)

       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                       PKCS12_KEY_GEN_UTF8_EX(3SSL)

       These methods perform a key derivation according to PKCS#12 (RFC7292) with an input password pass of
       length passlen, a salt salt of length saltlen, an iteration count iter and a digest algorithm md_type.
       The ID byte id determines how the resulting key is intended to be used:

       •   If  ID=1,  then  the  pseudorandom  bits being produced are to be used as key material for performing
           encryption or decryption.

       •   If ID=2, then the pseudorandom bits being produced are to be  used  as  an  IV  (Initial  Value)  for
           encryption or decryption.

       •   If ID=3, then the pseudorandom bits being produced are to be used as an integrity key for MACing.

       The intended format of the supplied password is determined by the method chosen:

       •   PKCS12_key_gen_asc() and PKCS12_key_gen_asc_ex() expect an ASCII-formatted password.

       •   PKCS12_key_gen_uni() and PKCS12_key_gen_uni_ex() expect a Unicode-formatted password.

       •   PKCS12_key_gen_utf8() and PKCS12_key_gen_utf8_ex() expect a UTF-8 encoded password.

       pass  is  the password used in the derivation of length passlen. pass is an optional parameter and can be
       NULL. If passlen is -1, then the function will calculate the length of pass using strlen().

       salt is the salt used in the derivation of length saltlen. If the salt is NULL, then saltlen must  be  0.
       The  function  will  not attempt to calculate the length of the salt because it is not assumed to be NULL
       terminated.

       iter is the iteration count and its value should be greater than or equal to  1.  RFC  2898  suggests  an
       iteration count of at least 1000. Any iter less than 1 is treated as a single iteration.

       digest is the message digest function used in the derivation.

       The derived key will be written to out. The size of the out buffer is specified via n.

       Functions  ending  in _ex() allow for a library context ctx and property query propq to be used to select
       algorithm implementations.

PKCS12_key_gen_asc_ex(), PKCS12_key_gen_uni_ex() and PKCS12_key_gen_utf8_ex() were added in OpenSSL 3.0.

       PKCS12_key_gen_asc, PKCS12_key_gen_asc_ex, PKCS12_key_gen_uni, PKCS12_key_gen_uni_ex,
       PKCS12_key_gen_utf8, PKCS12_key_gen_utf8_ex - PKCS#12 Password based key derivation

       A typical application of this function is to derive keying material for an encryption  algorithm  from  a
       password in the pass, a salt in salt, and an iteration count.

       Increasing the iter parameter slows down the algorithm which makes it harder for an attacker to perform a
       brute force attack using a large number of candidate passwords.

       Returns 1 on success or 0 on error.

PKCS12_create_ex(3), PKCS12_pbe_crypt_ex(3), passphrase-encoding(7)

        #include <openssl/pkcs12.h>

        int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
                               int saltlen, int id, int iter, int n,
                               unsigned char *out, const EVP_MD *md_type);
        int PKCS12_key_gen_asc_ex(const char *pass, int passlen, unsigned char *salt,
                                  int saltlen, int id, int iter, int n,
                                  unsigned char *out, const EVP_MD *md_type,
                                  OSSL_LIB_CTX *ctx, const char *propq);
        int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
                               int saltlen, int id, int iter, int n,
                               unsigned char *out, const EVP_MD *md_type);
        int PKCS12_key_gen_uni_ex(unsigned char *pass, int passlen, unsigned char *salt,
                                  int saltlen, int id, int iter, int n,
                                  unsigned char *out, const EVP_MD *md_type,
                                  OSSL_LIB_CTX *ctx, const char *propq);
        int PKCS12_key_gen_utf8(const char *pass, int passlen, unsigned char *salt,
                                int saltlen, int id, int iter, int n,
                                unsigned char *out, const EVP_MD *md_type);
        int PKCS12_key_gen_utf8_ex(const char *pass, int passlen, unsigned char *salt,
                                   int saltlen, int id, int iter, int n,
                                   unsigned char *out, const EVP_MD *md_type,
                                   OSSL_LIB_CTX *ctx, const char *propq);