FreeBSD manual
download PDF document: PKCS12_key_gen_asc.3.pdf
PKCS12_KEY_GEN_UTF8_EX(3ossl) OpenSSL PKCS12_KEY_GEN_UTF8_EX(3ossl)
NAME
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
SYNOPSIS
#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);
DESCRIPTION
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:
o If ID=1, then the pseudorandom bits being produced are to be used
as key material for performing encryption or decryption.
o If ID=2, then the pseudorandom bits being produced are to be used
as an IV (Initial Value) for encryption or decryption.
o 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:
o PKCS12_key_gen_asc() and PKCS12_key_gen_asc_ex() expect an ASCII-
formatted password.
o PKCS12_key_gen_uni() and PKCS12_key_gen_uni_ex() expect a Unicode-
formatted password.
o PKCS12_key_gen_utf8() and PKCS12_key_gen_utf8_ex() expect a UTF-8
encoded password.
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.
NOTES
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.
RETURN VALUES
Returns 1 on success or 0 on error.
CONFORMING TO
IETF RFC 7292 (<https://tools.ietf.org/html/rfc7292>)
SEE ALSO
PKCS12_create_ex(3), PKCS12_pbe_crypt_ex(3), passphrase-encoding(7)
HISTORY
PKCS12_key_gen_asc_ex(), PKCS12_key_gen_uni_ex() and
PKCS12_key_gen_utf8_ex() were added in OpenSSL 3.0.
COPYRIGHT
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>.
3.0.11 2023-09-19 PKCS12_KEY_GEN_UTF8_EX(3ossl)