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OSSL_PARAM_BLD(3) OpenSSL OSSL_PARAM_BLD(3)
NAME
OSSL_PARAM_BLD, OSSL_PARAM_BLD_new, OSSL_PARAM_BLD_to_param,
OSSL_PARAM_BLD_free, OSSL_PARAM_BLD_push_int, OSSL_PARAM_BLD_push_uint,
OSSL_PARAM_BLD_push_long, OSSL_PARAM_BLD_push_ulong,
OSSL_PARAM_BLD_push_int32, OSSL_PARAM_BLD_push_uint32,
OSSL_PARAM_BLD_push_int64, OSSL_PARAM_BLD_push_uint64,
OSSL_PARAM_BLD_push_size_t, OSSL_PARAM_BLD_push_time_t,
OSSL_PARAM_BLD_push_double, OSSL_PARAM_BLD_push_BN,
OSSL_PARAM_BLD_push_BN_pad, OSSL_PARAM_BLD_push_utf8_string,
OSSL_PARAM_BLD_push_utf8_ptr, OSSL_PARAM_BLD_push_octet_string,
OSSL_PARAM_BLD_push_octet_ptr - functions to assist in the creation of
OSSL_PARAM arrays
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/param_build.h>
typedef struct OSSL_PARAM_BLD;
OSSL_PARAM_BLD *OSSL_PARAM_BLD_new(void);
OSSL_PARAM *OSSL_PARAM_BLD_to_param(OSSL_PARAM_BLD *bld);
void OSSL_PARAM_BLD_free(OSSL_PARAM_BLD *bld);
int OSSL_PARAM_BLD_push_TYPE(OSSL_PARAM_BLD *bld, const char *key, TYPE val);
int OSSL_PARAM_BLD_push_BN(OSSL_PARAM_BLD *bld, const char *key,
const BIGNUM *bn);
int OSSL_PARAM_BLD_push_BN_pad(OSSL_PARAM_BLD *bld, const char *key,
const BIGNUM *bn, size_t sz);
int OSSL_PARAM_BLD_push_utf8_string(OSSL_PARAM_BLD *bld, const char *key,
const char *buf, size_t bsize);
int OSSL_PARAM_BLD_push_utf8_ptr(OSSL_PARAM_BLD *bld, const char *key,
char *buf, size_t bsize);
int OSSL_PARAM_BLD_push_octet_string(OSSL_PARAM_BLD *bld, const char *key,
const void *buf, size_t bsize);
int OSSL_PARAM_BLD_push_octet_ptr(OSSL_PARAM_BLD *bld, const char *key,
void *buf, size_t bsize);
DESCRIPTION
A collection of utility functions that simplify the creation of
OSSL_PARAM arrays. The TTYYPPEE names are as per OSSL_PARAM_int(3).
OSSL_PARAM_BLD_new() allocates and initialises a new OSSL_PARAM_BLD
structure so that values can be added. Any existing values are
cleared.
OSSL_PARAM_BLD_free() deallocates the memory allocates by
OSSL_PARAM_BLD_new().
OSSL_PARAM_BLD_to_param() converts a built up OSSL_PARAM_BLD structure
bld into an allocated OSSL_PARAM array. The OSSL_PARAM array and all
associated storage must be freed by calling OSSL_PARAM_free() with the
functions return value. OSSL_PARAM_BLD_free() can safely be called any
time after this function is.
OSSL_PARAM_BLD_push_TTYYPPEE() are a series of functions which will create
OSSL_PARAM objects of the specified size and correct type for the val
argument. val is stored by value and an expression or auto variable
can be used.
OSSL_PARAM_BLD_push_BN() is a function that will create an OSSL_PARAM
object that holds the specified BIGNUM bn. If bn is marked as being
securely allocated, its OSSL_PARAM representation will also be securely
allocated. The bn argument is stored by reference and the underlying
BIGNUM object must exist until after OSSL_PARAM_BLD_to_param() has been
called.
OSSL_PARAM_BLD_push_BN_pad() is a function that will create an
OSSL_PARAM object that holds the specified BIGNUM bn. The object will
be padded to occupy exactly sz bytes, if insufficient space is
specified an error results. If bn is marked as being securely
allocated, its OSSL_PARAM representation will also be securely
allocated. The bn argument is stored by reference and the underlying
BIGNUM object must exist until after OSSL_PARAM_BLD_to_param() has been
called.
OSSL_PARAM_BLD_push_utf8_string() is a function that will create an
OSSL_PARAM object that references the UTF8 string specified by buf.
The length of the string bsize should not include the terminating NUL
byte. If it is zero then it will be calculated. The string that buf
points to is stored by reference and must remain in scope until after
OSSL_PARAM_BLD_to_param() has been called.
OSSL_PARAM_BLD_push_octet_string() is a function that will create an
OSSL_PARAM object that references the octet string specified by buf and
<bsize>. The memory that buf points to is stored by reference and must
remain in scope until after OSSL_PARAM_BLD_to_param() has been called.
OSSL_PARAM_BLD_push_utf8_ptr() is a function that will create an
OSSL_PARAM object that references the UTF8 string specified by buf.
The length of the string bsize should not include the terminating NUL
byte. If it is zero then it will be calculated. The string buf points
to is stored by reference and must remain in scope until the OSSL_PARAM
array is freed.
OSSL_PARAM_BLD_push_octet_ptr() is a function that will create an
OSSL_PARAM object that references the octet string specified by buf.
The memory buf points to is stored by reference and must remain in
scope until the OSSL_PARAM array is freed.
RETURN VALUES
OSSL_PARAM_BLD_new() returns the allocated OSSL_PARAM_BLD structure, or
NULL on error.
OSSL_PARAM_BLD_to_param() returns the allocated OSSL_PARAM array, or
NULL on error.
All of the OSSL_PARAM_BLD_push_TYPE functions return 1 on success and 0
on error.
NOTES
OSSL_PARAM_BLD_push_BN() and OSSL_PARAM_BLD_push_BN_pad() currently
only support nonnegative BIGNUMs. They return an error on negative
BIGNUMs.
EXAMPLES
Both examples creating an OSSL_PARAM array that contains an RSA key.
For both, the predefined key variables are:
BIGNUM *n; /* modulus */
unsigned int e; /* public exponent */
BIGNUM *d; /* private exponent */
BIGNUM *p, *q; /* first two prime factors */
BIGNUM *dmp1, *dmq1; /* first two CRT exponents */
BIGNUM *iqmp; /* first CRT coefficient */
Example 1
This example shows how to create an OSSL_PARAM array that contains an
RSA private key.
OSSL_PARAM_BLD *bld = OSSL_PARAM_BLD_new();
OSSL_PARAM *params = NULL;
if (bld == NULL
|| !OSSL_PARAM_BLD_push_BN(bld, "n", n)
|| !OSSL_PARAM_BLD_push_uint(bld, "e", e)
|| !OSSL_PARAM_BLD_push_BN(bld, "d", d)
|| !OSSL_PARAM_BLD_push_BN(bld, "rsa-factor1", p)
|| !OSSL_PARAM_BLD_push_BN(bld, "rsa-factor2", q)
|| !OSSL_PARAM_BLD_push_BN(bld, "rsa-exponent1", dmp1)
|| !OSSL_PARAM_BLD_push_BN(bld, "rsa-exponent2", dmq1)
|| !OSSL_PARAM_BLD_push_BN(bld, "rsa-coefficient1", iqmp)
|| (params = OSSL_PARAM_BLD_to_param(bld)) == NULL)
goto err;
OSSL_PARAM_BLD_free(bld);
/* Use params */
...
OSSL_PARAM_free(params);
Example 2
This example shows how to create an OSSL_PARAM array that contains an
RSA public key.
OSSL_PARAM_BLD *bld = OSSL_PARAM_BLD_new();
OSSL_PARAM *params = NULL;
if (nld == NULL
|| !OSSL_PARAM_BLD_push_BN(bld, "n", n)
|| !OSSL_PARAM_BLD_push_uint(bld, "e", e)
|| (params = OSSL_PARAM_BLD_to_param(bld)) == NULL)
goto err;
OSSL_PARAM_BLD_free(bld);
/* Use params */
...
OSSL_PARAM_free(params);
SEE ALSO
OSSL_PARAM_int(3), OSSL_PARAM(3), OSSL_PARAM_free(3)
HISTORY
The functions described here were all added in OpenSSL 3.0.
COPYRIGHT
Copyright 2019-2022 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>.
3.0.12 2023-05-07 OSSL_PARAM_BLD(3)