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+.\" ========================================================================
+.\"
+.IX Title "RSA_GET0_KEY 3"
+.TH RSA_GET0_KEY 3 "2019-09-10" "1.1.1d" "OpenSSL"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "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
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #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);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+An \s-1RSA\s0 object contains the components for the public and private key,
+\&\fBn\fR, \fBe\fR, \fBd\fR, \fBp\fR, \fBq\fR, \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR. \fBn\fR is
+the modulus common to both public and private key, \fBe\fR is the public
+exponent and \fBd\fR is the private exponent. \fBp\fR, \fBq\fR, \fBdmp1\fR,
+\&\fBdmq1\fR and \fBiqmp\fR are the factors for the second representation of a
+private key (see PKCS#1 section 3 Key Types), where \fBp\fR and \fBq\fR are
+the first and second factor of \fBn\fR and \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR
+are the exponents and coefficient for \s-1CRT\s0 calculations.
+.PP
+For multi-prime \s-1RSA\s0 (defined in \s-1RFC 8017\s0), there are also one or more
+\&'triplet' in an \s-1RSA\s0 object. A triplet contains three members, \fBr\fR, \fBd\fR
+and \fBt\fR. \fBr\fR is the additional prime besides \fBp\fR and \fBq\fR. \fBd\fR and
+\&\fBt\fR are the exponent and coefficient for \s-1CRT\s0 calculations.
+.PP
+The \fBn\fR, \fBe\fR and \fBd\fR parameters can be obtained by calling
+\&\fBRSA_get0_key()\fR. If they have not been set yet, then \fB*n\fR, \fB*e\fR and
+\&\fB*d\fR will be set to \s-1NULL.\s0 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.
+.PP
+The \fBn\fR, \fBe\fR and \fBd\fR parameter values can be set by calling
+\&\fBRSA_set0_key()\fR and passing the new values for \fBn\fR, \fBe\fR and \fBd\fR as
+parameters to the function. The values \fBn\fR and \fBe\fR must be non-NULL
+the first time this function is called on a given \s-1RSA\s0 object. The
+value \fBd\fR may be \s-1NULL.\s0 On subsequent calls any of these values may be
+\&\s-1NULL\s0 which means the corresponding \s-1RSA\s0 field is left untouched.
+Calling this function transfers the memory management of the values to
+the \s-1RSA\s0 object, and therefore the values that have been passed in
+should not be freed by the caller after this function has been called.
+.PP
+In a similar fashion, the \fBp\fR and \fBq\fR parameters can be obtained and
+set with \fBRSA_get0_factors()\fR and \fBRSA_set0_factors()\fR, and the \fBdmp1\fR,
+\&\fBdmq1\fR and \fBiqmp\fR parameters can be obtained and set with
+\&\fBRSA_get0_crt_params()\fR and \fBRSA_set0_crt_params()\fR.
+.PP
+For \fBRSA_get0_key()\fR, \fBRSA_get0_factors()\fR, and \fBRSA_get0_crt_params()\fR,
+\&\s-1NULL\s0 value \s-1BIGNUM\s0 ** output parameters are permitted. The functions
+ignore \s-1NULL\s0 parameters but return values for other, non-NULL, parameters.
+.PP
+For multi-prime \s-1RSA,\s0 \fBRSA_get0_multi_prime_factors()\fR and \fBRSA_get0_multi_prime_params()\fR
+can be used to obtain other primes and related \s-1CRT\s0 parameters. The
+return values are stored in an array of \fB\s-1BIGNUM\s0 *\fR. \fBRSA_set0_multi_prime_params()\fR
+sets a collect of multi-prime 'triplet' members (prime, exponent and coefficient)
+into an \s-1RSA\s0 object.
+.PP
+Any of the values \fBn\fR, \fBe\fR, \fBd\fR, \fBp\fR, \fBq\fR, \fBdmp1\fR, \fBdmq1\fR, and \fBiqmp\fR can also be
+retrieved separately by the corresponding function
+\&\fBRSA_get0_n()\fR, \fBRSA_get0_e()\fR, \fBRSA_get0_d()\fR, \fBRSA_get0_p()\fR, \fBRSA_get0_q()\fR,
+\&\fBRSA_get0_dmp1()\fR, \fBRSA_get0_dmq1()\fR, and \fBRSA_get0_iqmp()\fR, respectively.
+.PP
+\&\fBRSA_set_flags()\fR sets the flags in the \fBflags\fR parameter on the \s-1RSA\s0
+object. Multiple flags can be passed in one go (bitwise ORed together).
+Any flags that are already set are left set. \fBRSA_test_flags()\fR tests to
+see whether the flags passed in the \fBflags\fR parameter are currently
+set in the \s-1RSA\s0 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. \fBRSA_clear_flags()\fR clears the specified flags within the
+\&\s-1RSA\s0 object.
+.PP
+\&\fBRSA_get0_engine()\fR returns a handle to the \s-1ENGINE\s0 that has been set for
+this \s-1RSA\s0 object, or \s-1NULL\s0 if no such \s-1ENGINE\s0 has been set.
+.PP
+\&\fBRSA_get_version()\fR returns the version of an \s-1RSA\s0 object \fBr\fR.
+.SH "NOTES"
+.IX Header "NOTES"
+Values retrieved with \fBRSA_get0_key()\fR are owned by the \s-1RSA\s0 object used
+in the call and may therefore \fInot\fR be passed to \fBRSA_set0_key()\fR. If
+needed, duplicate the received value using \fBBN_dup()\fR and pass the
+duplicate. The same applies to \fBRSA_get0_factors()\fR and \fBRSA_set0_factors()\fR
+as well as \fBRSA_get0_crt_params()\fR and \fBRSA_set0_crt_params()\fR.
+.PP
+The caller should obtain the size by calling \fBRSA_get_multi_prime_extra_count()\fR
+in advance and allocate sufficient buffer to store the return values before
+calling \fBRSA_get0_multi_prime_factors()\fR and \fBRSA_get0_multi_prime_params()\fR.
+.PP
+\&\fBRSA_set0_multi_prime_params()\fR always clears the original multi-prime
+triplets in \s-1RSA\s0 object \fBr\fR and assign the new set of triplets into it.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fBRSA_set0_key()\fR, \fBRSA_set0_factors()\fR, \fBRSA_set0_crt_params()\fR and
+\&\fBRSA_set0_multi_prime_params()\fR return 1 on success or 0 on failure.
+.PP
+\&\fBRSA_get0_n()\fR, \fBRSA_get0_e()\fR, \fBRSA_get0_d()\fR, \fBRSA_get0_p()\fR, \fBRSA_get0_q()\fR,
+\&\fBRSA_get0_dmp1()\fR, \fBRSA_get0_dmq1()\fR, and \fBRSA_get0_iqmp()\fR
+return the respective value.
+.PP
+\&\fBRSA_get0_multi_prime_factors()\fR and \fBRSA_get0_multi_prime_crt_params()\fR return
+1 on success or 0 on failure.
+.PP
+\&\fBRSA_get_multi_prime_extra_count()\fR returns two less than the number of primes
+in use, which is 0 for traditional \s-1RSA\s0 and the number of extra primes for
+multi-prime \s-1RSA.\s0
+.PP
+\&\fBRSA_get_version()\fR returns \fB\s-1RSA_ASN1_VERSION_MULTI\s0\fR for multi-prime \s-1RSA\s0 and
+\&\fB\s-1RSA_ASN1_VERSION_DEFAULT\s0\fR for normal two-prime \s-1RSA,\s0 as defined in \s-1RFC 8017.\s0
+.PP
+\&\fBRSA_test_flags()\fR returns the current state of the flags in the \s-1RSA\s0 object.
+.PP
+\&\fBRSA_get0_engine()\fR returns the \s-1ENGINE\s0 set for the \s-1RSA\s0 object or \s-1NULL\s0 if no
+\&\s-1ENGINE\s0 has been set.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBRSA_new\fR\|(3), \fBRSA_size\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+The
+\&\fBRSA_get_multi_prime_extra_count()\fR, \fBRSA_get0_multi_prime_factors()\fR,
+\&\fBRSA_get0_multi_prime_crt_params()\fR, \fBRSA_set0_multi_prime_params()\fR,
+and \fBRSA_get_version()\fR functions were added in OpenSSL 1.1.1.
+.PP
+Other functions described here were added in OpenSSL 1.1.0.
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2016\-2018 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file \s-1LICENSE\s0 in the source distribution or at
+<https://www.openssl.org/source/license.html>.