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RSA_GET0_KEY(3)			    OpenSSL		       RSA_GET0_KEY(3)

NAME
       RSA_set0_key, RSA_set0_factors, RSA_set0_crt_params, RSA_get0_key,
       RSA_get0_factors, RSA_get0_crt_params, RSA_get0_n, RSA_get0_e,
       RSA_get0_d, RSA_get0_p, RSA_get0_q, RSA_get0_dmp1, RSA_get0_dmq1,
       RSA_get0_iqmp, RSA_clear_flags, RSA_test_flags, RSA_set_flags,
       RSA_get0_engine,	RSA_get_multi_prime_extra_count,
       RSA_get0_multi_prime_factors, RSA_get0_multi_prime_crt_params,
       RSA_set0_multi_prime_params, RSA_get_version - Routines for getting and
       setting data in an RSA object

SYNOPSIS
	#include <openssl/rsa.h>

	int RSA_set0_key(RSA *r, BIGNUM	*n, BIGNUM *e, BIGNUM *d);
	int RSA_set0_factors(RSA *r, BIGNUM *p,	BIGNUM *q);
	int RSA_set0_crt_params(RSA *r,	BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp);
	void RSA_get0_key(const	RSA *r,
			  const	BIGNUM **n, const BIGNUM **e, const BIGNUM **d);
	void RSA_get0_factors(const RSA	*r, const BIGNUM **p, const BIGNUM **q);
	void RSA_get0_crt_params(const RSA *r,
				 const BIGNUM **dmp1, const BIGNUM **dmq1,
				 const BIGNUM **iqmp);
	const BIGNUM *RSA_get0_n(const RSA *d);
	const BIGNUM *RSA_get0_e(const RSA *d);
	const BIGNUM *RSA_get0_d(const RSA *d);
	const BIGNUM *RSA_get0_p(const RSA *d);
	const BIGNUM *RSA_get0_q(const RSA *d);
	const BIGNUM *RSA_get0_dmp1(const RSA *r);
	const BIGNUM *RSA_get0_dmq1(const RSA *r);
	const BIGNUM *RSA_get0_iqmp(const RSA *r);
	void RSA_clear_flags(RSA *r, int flags);
	int RSA_test_flags(const RSA *r, int flags);
	void RSA_set_flags(RSA *r, int flags);
	ENGINE *RSA_get0_engine(RSA *r);
	int RSA_get_multi_prime_extra_count(const RSA *r);
	int RSA_get0_multi_prime_factors(const RSA *r, const BIGNUM *primes[]);
	int RSA_get0_multi_prime_crt_params(const RSA *r, const	BIGNUM *exps[],
					    const BIGNUM *coeffs[]);
	int RSA_set0_multi_prime_params(RSA *r,	BIGNUM *primes[], BIGNUM *exps[],
				       BIGNUM *coeffs[], int pnum);
	int RSA_get_version(RSA	*r);

DESCRIPTION
       An RSA object contains the components for the public and	private	key,
       n, e, d,	p, q, dmp1, dmq1 and iqmp.  n is the modulus common to both
       public and private key, e is the	public exponent	and d is the private
       exponent.  p, q,	dmp1, dmq1 and iqmp are	the factors for	the second
       representation of a private key (see PKCS#1 section 3 Key Types), where
       p and q are the first and second	factor of n and	dmp1, dmq1 and iqmp
       are the exponents and coefficient for CRT calculations.

       For multi-prime RSA (defined in RFC 8017), there	are also one or	more
       'triplet' in an RSA object. A triplet contains three members, r,	d and
       t. r is the additional prime besides p and q. d and t are the exponent
       and coefficient for CRT calculations.

       The n, e	and d parameters can be	obtained by calling RSA_get0_key().
       If they have not	been set yet, then *n, *e and *d will be set to	NULL.
       Otherwise, they are set to pointers to their respective values. These
       point directly to the internal representations of the values and
       therefore should	not be freed by	the caller.

       The n, e	and d parameter	values can be set by calling RSA_set0_key()
       and passing the new values for n, e and d as parameters to the
       function.  The values n and e must be non-NULL the first	time this
       function	is called on a given RSA object. The value d may be NULL. On
       subsequent calls	any of these values may	be NULL	which means the
       corresponding RSA field is left untouched.  Calling this	function
       transfers the memory management of the values to	the RSA	object,	and
       therefore the values that have been passed in should not	be freed by
       the caller after	this function has been called.

       In a similar fashion, the p and q parameters can	be obtained and	set
       with RSA_get0_factors() and RSA_set0_factors(), and the dmp1, dmq1 and
       iqmp parameters can be obtained and set with RSA_get0_crt_params() and
       RSA_set0_crt_params().

       For RSA_get0_key(), RSA_get0_factors(), and RSA_get0_crt_params(), NULL
       value BIGNUM ** output parameters are permitted.	The functions ignore
       NULL parameters but return values for other, non-NULL, parameters.

       For multi-prime RSA, RSA_get0_multi_prime_factors() and
       RSA_get0_multi_prime_params() can be used to obtain other primes	and
       related CRT parameters. The return values are stored in an array	of
       BIGNUM *. RSA_set0_multi_prime_params() sets a collect of multi-prime
       'triplet' members (prime, exponent and coefficient) into	an RSA object.

       Any of the values n, e, d, p, q,	dmp1, dmq1, and	iqmp can also be
       retrieved separately by the corresponding function RSA_get0_n(),
       RSA_get0_e(), RSA_get0_d(), RSA_get0_p(), RSA_get0_q(),
       RSA_get0_dmp1(),	RSA_get0_dmq1(), and RSA_get0_iqmp(), respectively.

       RSA_set_flags() sets the	flags in the flags parameter on	the RSA
       object. Multiple	flags can be passed in one go (bitwise ORed together).
       Any flags that are already set are left set. RSA_test_flags() tests to
       see whether the flags passed in the flags parameter are currently set
       in the RSA object. Multiple flags can be	tested in one go. All flags
       that are	currently set are returned, or zero if none of the flags are
       set. RSA_clear_flags() clears the specified flags within	the RSA
       object.

       RSA_get0_engine() returns a handle to the ENGINE	that has been set for
       this RSA	object,	or NULL	if no such ENGINE has been set.

       RSA_get_version() returns the version of	an RSA object r.

NOTES
       Values retrieved	with RSA_get0_key() are	owned by the RSA object	used
       in the call and may therefore not be passed to RSA_set0_key().  If
       needed, duplicate the received value using BN_dup() and pass the
       duplicate.  The same applies to RSA_get0_factors() and
       RSA_set0_factors() as well as RSA_get0_crt_params() and
       RSA_set0_crt_params().

       The caller should obtain	the size by calling
       RSA_get_multi_prime_extra_count() in advance and	allocate sufficient
       buffer to store the return values before	calling
       RSA_get0_multi_prime_factors() and RSA_get0_multi_prime_params().

       RSA_set0_multi_prime_params() always clears the original	multi-prime
       triplets	in RSA object r	and assign the new set of triplets into	it.

RETURN VALUES
       RSA_set0_key(), RSA_set0_factors(), RSA_set0_crt_params() and
       RSA_set0_multi_prime_params() return 1 on success or 0 on failure.

       RSA_get0_n(), RSA_get0_e(), RSA_get0_d(), RSA_get0_p(), RSA_get0_q(),
       RSA_get0_dmp1(),	RSA_get0_dmq1(), and RSA_get0_iqmp() return the
       respective value.

       RSA_get0_multi_prime_factors() and RSA_get0_multi_prime_crt_params()
       return 1	on success or 0	on failure.

       RSA_get_multi_prime_extra_count() returns two less than the number of
       primes in use, which is 0 for traditional RSA and the number of extra
       primes for multi-prime RSA.

       RSA_get_version() returns RSA_ASN1_VERSION_MULTI	for multi-prime	RSA
       and RSA_ASN1_VERSION_DEFAULT for	normal two-prime RSA, as defined in
       RFC 8017.

       RSA_test_flags()	returns	the current state of the flags in the RSA
       object.

       RSA_get0_engine() returns the ENGINE set	for the	RSA object or NULL if
       no ENGINE has been set.

SEE ALSO
       RSA_new(3), RSA_size(3)

HISTORY
       The RSA_get_multi_prime_extra_count(), RSA_get0_multi_prime_factors(),
       RSA_get0_multi_prime_crt_params(), RSA_set0_multi_prime_params(), and
       RSA_get_version() functions were	added in OpenSSL 1.1.1.

       Other functions described here were added in OpenSSL 1.1.0.

COPYRIGHT
       Copyright 2016-2018 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (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>.

1.1.1d				  2019-09-10		       RSA_GET0_KEY(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUES | SEE ALSO | HISTORY | COPYRIGHT

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