07c54e598c
Document that the RSA_get0_ functions permit a NULL BIGNUM **. Those output parameters are ignored. Reviewed-by: Paul Dale <paul.dale@oracle.com> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4064)
112 lines
4.6 KiB
Text
112 lines
4.6 KiB
Text
=pod
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=head1 NAME
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RSA_set0_key, RSA_set0_factors, RSA_set0_crt_params, RSA_get0_key,
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RSA_get0_factors, RSA_get0_crt_params, RSA_clear_flags,
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RSA_test_flags, RSA_set_flags, RSA_get0_engine - Routines for getting
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and setting data in an RSA object
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=head1 SYNOPSIS
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#include <openssl/rsa.h>
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int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d);
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int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q);
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int RSA_set0_crt_params(RSA *r, BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp);
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void RSA_get0_key(const RSA *r,
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const BIGNUM **n, const BIGNUM **e, const BIGNUM **d);
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void RSA_get0_factors(const RSA *r, const BIGNUM **p, const BIGNUM **q);
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void RSA_get0_crt_params(const RSA *r,
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const BIGNUM **dmp1, const BIGNUM **dmq1,
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const BIGNUM **iqmp);
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void RSA_clear_flags(RSA *r, int flags);
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int RSA_test_flags(const RSA *r, int flags);
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void RSA_set_flags(RSA *r, int flags);
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ENGINE *RSA_get0_engine(RSA *r);
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=head1 DESCRIPTION
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An RSA object contains the components for the public and private key,
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B<n>, B<e>, B<d>, B<p>, B<q>, B<dmp1>, B<dmq1> and B<iqmp>. B<n> is
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the modulus common to both public and private key, B<e> is the public
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exponent and B<d> is the private exponent. B<p>, B<q>, B<dmp1>,
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B<dmq1> and B<iqmp> are the factors for the second representation of a
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private key (see PKCS#1 section 3 Key Types), where B<p> and B<q> are
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the first and second factor of B<n> and B<dmp1>, B<dmq1> and B<iqmp>
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are the exponents and coefficient for CRT calculations.
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The B<n>, B<e> and B<d> parameters can be obtained by calling
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RSA_get0_key(). If they have not been set yet, then B<*n>, B<*e> and
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B<*d> will be set to NULL. Otherwise, they are set to pointers to
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their respective values. These point directly to the internal
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representations of the values and therefore should not be freed
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by the caller.
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The B<n>, B<e> and B<d> parameter values can be set by calling
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RSA_set0_key() and passing the new values for B<n>, B<e> and B<d> as
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parameters to the function. The values B<n> and B<e> must be non-NULL
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the first time this function is called on a given RSA object. The
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value B<d> may be NULL. On subsequent calls any of these values may be
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NULL which means the corresponding RSA field is left untouched.
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Calling this function transfers the memory management of the values to
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the RSA object, and therefore the values that have been passed in
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should not be freed by the caller after this function has been called.
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In a similar fashion, the B<p> and B<q> parameters can be obtained and
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set with RSA_get0_factors() and RSA_set0_factors(), and the B<dmp1>,
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B<dmq1> and B<iqmp> parameters can be obtained and set with
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RSA_get0_crt_params() and RSA_set0_crt_params().
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For RSA_get0_key(), RSA_get0_factors(), and RSA_get0_crt_params(),
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NULL value BIGNUM ** output parameters are permitted. The functions
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ignore NULL parameters but return values for other, non-NULL, parameters.
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RSA_set_flags() sets the flags in the B<flags> parameter on the RSA
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object. Multiple flags can be passed in one go (bitwise ORed together).
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Any flags that are already set are left set. RSA_test_flags() tests to
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see whether the flags passed in the B<flags> parameter are currently
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set in the RSA object. Multiple flags can be tested in one go. All
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flags that are currently set are returned, or zero if none of the
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flags are set. RSA_clear_flags() clears the specified flags within the
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RSA object.
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RSA_get0_engine() returns a handle to the ENGINE that has been set for
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this RSA object, or NULL if no such ENGINE has been set.
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=head1 NOTES
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Values retrieved with RSA_get0_key() are owned by the RSA object used
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in the call and may therefore I<not> be passed to RSA_set0_key(). If
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needed, duplicate the received value using BN_dup() and pass the
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duplicate. The same applies to RSA_get0_factors() and RSA_set0_factors()
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as well as RSA_get0_crt_params() and RSA_set0_crt_params().
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=head1 RETURN VALUES
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RSA_set0_key(), RSA_set0_factors and RSA_set0_crt_params() return 1 on
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success or 0 on failure.
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RSA_test_flags() returns the current state of the flags in the RSA object.
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RSA_get0_engine() returns the ENGINE set for the RSA object or NULL if no
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ENGINE has been set.
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=head1 SEE ALSO
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L<RSA_new(3)>, L<RSA_size(3)>
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=head1 HISTORY
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The functions described here were added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). 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 LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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