339 lines
13 KiB
Plaintext
339 lines
13 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "OSSL_PARAM_BLD 3ossl"
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.TH OSSL_PARAM_BLD 3ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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OSSL_PARAM_BLD, OSSL_PARAM_BLD_new, OSSL_PARAM_BLD_to_param,
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OSSL_PARAM_BLD_free, OSSL_PARAM_BLD_push_int,
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OSSL_PARAM_BLD_push_uint, OSSL_PARAM_BLD_push_long,
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OSSL_PARAM_BLD_push_ulong, OSSL_PARAM_BLD_push_int32,
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OSSL_PARAM_BLD_push_uint32, OSSL_PARAM_BLD_push_int64,
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OSSL_PARAM_BLD_push_uint64, OSSL_PARAM_BLD_push_size_t,
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OSSL_PARAM_BLD_push_time_t, OSSL_PARAM_BLD_push_double,
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OSSL_PARAM_BLD_push_BN, OSSL_PARAM_BLD_push_BN_pad,
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OSSL_PARAM_BLD_push_utf8_string, OSSL_PARAM_BLD_push_utf8_ptr,
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OSSL_PARAM_BLD_push_octet_string, OSSL_PARAM_BLD_push_octet_ptr
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\&\- functions to assist in the creation of OSSL_PARAM arrays
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/param_build.h>
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\&
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\& typedef struct OSSL_PARAM_BLD;
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\&
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\& OSSL_PARAM_BLD *OSSL_PARAM_BLD_new(void);
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\& OSSL_PARAM *OSSL_PARAM_BLD_to_param(OSSL_PARAM_BLD *bld);
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\& void OSSL_PARAM_BLD_free(OSSL_PARAM_BLD *bld);
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\&
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\& int OSSL_PARAM_BLD_push_TYPE(OSSL_PARAM_BLD *bld, const char *key, TYPE val);
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\&
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\& int OSSL_PARAM_BLD_push_BN(OSSL_PARAM_BLD *bld, const char *key,
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\& const BIGNUM *bn);
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\& int OSSL_PARAM_BLD_push_BN_pad(OSSL_PARAM_BLD *bld, const char *key,
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\& const BIGNUM *bn, size_t sz);
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\&
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\& int OSSL_PARAM_BLD_push_utf8_string(OSSL_PARAM_BLD *bld, const char *key,
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\& const char *buf, size_t bsize);
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\& int OSSL_PARAM_BLD_push_utf8_ptr(OSSL_PARAM_BLD *bld, const char *key,
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\& char *buf, size_t bsize);
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\& int OSSL_PARAM_BLD_push_octet_string(OSSL_PARAM_BLD *bld, const char *key,
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\& const void *buf, size_t bsize);
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\& int OSSL_PARAM_BLD_push_octet_ptr(OSSL_PARAM_BLD *bld, const char *key,
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\& void *buf, size_t bsize);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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A collection of utility functions that simplify the creation of \s-1OSSL_PARAM\s0
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arrays. The \fB\f(BI\s-1TYPE\s0\fB\fR names are as per \fIOSSL_PARAM_int\fR\|(3).
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.PP
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\&\fIOSSL_PARAM_BLD_new()\fR allocates and initialises a new \s-1OSSL_PARAM_BLD\s0 structure
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so that values can be added.
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Any existing values are cleared.
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.PP
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\&\fIOSSL_PARAM_BLD_free()\fR deallocates the memory allocates by \fIOSSL_PARAM_BLD_new()\fR.
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.PP
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\&\fIOSSL_PARAM_BLD_to_param()\fR converts a built up \s-1OSSL_PARAM_BLD\s0 structure
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\&\fIbld\fR into an allocated \s-1OSSL_PARAM\s0 array.
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The \s-1OSSL_PARAM\s0 array and all associated storage must be freed by calling
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\&\fIOSSL_PARAM_free()\fR with the functions return value.
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\&\fIOSSL_PARAM_BLD_free()\fR can safely be called any time after this function is.
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.PP
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\&\fBOSSL_PARAM_BLD_push_\f(BI\s-1TYPE\s0\fB\fR() are a series of functions which will create
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\&\s-1OSSL_PARAM\s0 objects of the specified size and correct type for the \fIval\fR
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argument.
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\&\fIval\fR is stored by value and an expression or auto variable can be used.
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.PP
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When \fB\f(BI\s-1TYPE\s0\fB\fR denotes an integer type, signed integer types will normally
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get the \s-1OSSL_PARAM\s0 type \fB\s-1OSSL_PARAM_INTEGER\s0\fR params.
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When \fB\f(BI\s-1TYPE\s0\fB\fR denotes an unsigned integer type will get the \s-1OSSL_PARAM\s0 type
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\&\fB\s-1OSSL_PARAM_UNSIGNED_INTEGER\s0\fR.
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.PP
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\&\fIOSSL_PARAM_BLD_push_BN()\fR is a function that will create an \s-1OSSL_PARAM\s0 object
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that holds the specified \s-1BIGNUM \s0\fIbn\fR.
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When the \fIbn\fR is zero or positive, its \s-1OSSL_PARAM\s0 type becomes
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\&\fB\s-1OSSL_PARAM_UNSIGNED_INTEGER\s0\fR.
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When the \fIbn\fR is negative, its \s-1OSSL_PARAM\s0 type becomes \fB\s-1OSSL_PARAM_INTEGER\s0\fR.
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If \fIbn\fR is marked as being securely allocated, its \s-1OSSL_PARAM\s0 representation
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will also be securely allocated.
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The \fIbn\fR argument is stored by reference and the underlying \s-1BIGNUM\s0 object
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must exist until after \fIOSSL_PARAM_BLD_to_param()\fR has been called.
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.PP
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\&\fIOSSL_PARAM_BLD_push_BN_pad()\fR is a function that will create an \s-1OSSL_PARAM\s0 object
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that holds the specified \s-1BIGNUM \s0\fIbn\fR.
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The object will be padded to occupy exactly \fIsz\fR bytes, if insufficient space
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is specified an error results.
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When the \fIbn\fR is zero or positive, its \s-1OSSL_PARAM\s0 type becomes
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\&\fB\s-1OSSL_PARAM_UNSIGNED_INTEGER\s0\fR.
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When the \fIbn\fR is negative, its \s-1OSSL_PARAM\s0 type becomes \fB\s-1OSSL_PARAM_INTEGER\s0\fR.
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If \fIbn\fR is marked as being securely allocated, its \s-1OSSL_PARAM\s0 representation
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will also be securely allocated.
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The \fIbn\fR argument is stored by reference and the underlying \s-1BIGNUM\s0 object
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must exist until after \fIOSSL_PARAM_BLD_to_param()\fR has been called.
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.PP
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\&\fIOSSL_PARAM_BLD_push_utf8_string()\fR is a function that will create an \s-1OSSL_PARAM\s0
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object that references the \s-1UTF8\s0 string specified by \fIbuf\fR.
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The length of the string \fIbsize\fR should not include the terminating \s-1NUL\s0 byte.
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If it is zero then it will be calculated.
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The string that \fIbuf\fR points to is stored by reference and must remain in
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scope until after \fIOSSL_PARAM_BLD_to_param()\fR has been called.
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.PP
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\&\fIOSSL_PARAM_BLD_push_octet_string()\fR is a function that will create an \s-1OSSL_PARAM\s0
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object that references the octet string specified by \fIbuf\fR and <bsize>.
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The memory that \fIbuf\fR points to is stored by reference and must remain in
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scope until after \fIOSSL_PARAM_BLD_to_param()\fR has been called.
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.PP
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\&\fIOSSL_PARAM_BLD_push_utf8_ptr()\fR is a function that will create an \s-1OSSL_PARAM\s0
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object that references the \s-1UTF8\s0 string specified by \fIbuf\fR.
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The length of the string \fIbsize\fR should not include the terminating \s-1NUL\s0 byte.
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If it is zero then it will be calculated.
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The string \fIbuf\fR points to is stored by reference and must remain in
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scope until the \s-1OSSL_PARAM\s0 array is freed.
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.PP
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\&\fIOSSL_PARAM_BLD_push_octet_ptr()\fR is a function that will create an \s-1OSSL_PARAM\s0
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object that references the octet string specified by \fIbuf\fR.
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The memory \fIbuf\fR points to is stored by reference and must remain in
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scope until the \s-1OSSL_PARAM\s0 array is freed.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIOSSL_PARAM_BLD_new()\fR returns the allocated \s-1OSSL_PARAM_BLD\s0 structure, or \s-1NULL\s0
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on error.
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.PP
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\&\fIOSSL_PARAM_BLD_to_param()\fR returns the allocated \s-1OSSL_PARAM\s0 array, or \s-1NULL\s0
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on error.
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.PP
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All of the OSSL_PARAM_BLD_push_TYPE functions return 1 on success and 0
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on error.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fIOSSL_PARAM_BLD_push_BN()\fR and \fIOSSL_PARAM_BLD_push_BN_pad()\fR only
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support nonnegative \fB\s-1BIGNUM\s0\fRs. They return an error on negative
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\&\fB\s-1BIGNUM\s0\fRs.
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To pass signed \fB\s-1BIGNUM\s0\fRs, use \fIOSSL_PARAM_BLD_push_signed_BN()\fR.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Both examples creating an \s-1OSSL_PARAM\s0 array that contains an \s-1RSA\s0 key.
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For both, the predefined key variables are:
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.PP
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.Vb 6
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\& BIGNUM *n; /* modulus */
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\& unsigned int e; /* public exponent */
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\& BIGNUM *d; /* private exponent */
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\& BIGNUM *p, *q; /* first two prime factors */
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\& BIGNUM *dmp1, *dmq1; /* first two CRT exponents */
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\& BIGNUM *iqmp; /* first CRT coefficient */
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.Ve
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.SS "Example 1"
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.IX Subsection "Example 1"
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This example shows how to create an \s-1OSSL_PARAM\s0 array that contains an \s-1RSA\s0
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private key.
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.PP
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.Vb 2
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\& OSSL_PARAM_BLD *bld = OSSL_PARAM_BLD_new();
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\& OSSL_PARAM *params = NULL;
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\&
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\& if (bld == NULL
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\& || !OSSL_PARAM_BLD_push_BN(bld, "n", n)
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\& || !OSSL_PARAM_BLD_push_uint(bld, "e", e)
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\& || !OSSL_PARAM_BLD_push_BN(bld, "d", d)
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\& || !OSSL_PARAM_BLD_push_BN(bld, "rsa\-factor1", p)
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\& || !OSSL_PARAM_BLD_push_BN(bld, "rsa\-factor2", q)
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\& || !OSSL_PARAM_BLD_push_BN(bld, "rsa\-exponent1", dmp1)
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\& || !OSSL_PARAM_BLD_push_BN(bld, "rsa\-exponent2", dmq1)
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\& || !OSSL_PARAM_BLD_push_BN(bld, "rsa\-coefficient1", iqmp)
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\& || (params = OSSL_PARAM_BLD_to_param(bld)) == NULL)
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\& goto err;
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\& OSSL_PARAM_BLD_free(bld);
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\& /* Use params */
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\& ...
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\& OSSL_PARAM_free(params);
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.Ve
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.SS "Example 2"
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.IX Subsection "Example 2"
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This example shows how to create an \s-1OSSL_PARAM\s0 array that contains an \s-1RSA\s0
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public key.
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.PP
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.Vb 2
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\& OSSL_PARAM_BLD *bld = OSSL_PARAM_BLD_new();
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\& OSSL_PARAM *params = NULL;
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\&
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\& if (nld == NULL
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\& || !OSSL_PARAM_BLD_push_BN(bld, "n", n)
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\& || !OSSL_PARAM_BLD_push_uint(bld, "e", e)
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\& || (params = OSSL_PARAM_BLD_to_param(bld)) == NULL)
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\& goto err;
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\& OSSL_PARAM_BLD_free(bld);
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\& /* Use params */
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\& ...
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\& OSSL_PARAM_free(params);
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIOSSL_PARAM_int\fR\|(3), \s-1\fIOSSL_PARAM\s0\fR\|(3), \fIOSSL_PARAM_free\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The functions described here were all added in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2019\-2022 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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