RSA_get0_factors (3)

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NAME

RSA_set0_key, RSA_set0_factors, RSA_set0_crt_params, RSA_get0_key, RSA_get0_factors, RSA_get0_crt_params, RSA_clear_flags, RSA_test_flags, RSA_set_flags, RSA_get0_engine - 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);
 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);

DESCRIPTION

An 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 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

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

object. The value d may be On subsequent calls any of these values may be which means the corresponding field is left untouched. Calling this function transfers the memory management of the values to the 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(),

value ** output parameters are permitted. The functions ignore parameters but return values for other, non-NULL, parameters.

RSA_set_flags() sets the flags in the flags parameter on the

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 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 object.

RSA_get0_engine() returns a handle to the

that has been set for this object, or if no such has been set.

NOTES

Values retrieved with RSA_get0_key() are owned by the 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().

RETURN VALUES

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

RSA_test_flags() returns the current state of the flags in the

object.

RSA_get0_engine() returns the

set for the object or if no has been set.

SEE ALSO

rsa(3), RSA_new(3), RSA_size(3)

HISTORY

The functions described here were added in OpenSSL 1.1.0.

COPYRIGHT

Copyright 2016 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

in the source distribution or at <www.openssl.org/source/license.html>.