.\" $OpenBSD: RSA_meth_new.3,v 1.3 2018/09/12 15:09:22 jmc Exp $ .\" selective merge up to: OpenSSL a970b14f Jul 31 18:58:40 2017 -0400 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2018 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: September 12 2018 $ .Dt RSA_METH_NEW 3 .Os .Sh NAME .Nm RSA_meth_new , .Nm RSA_meth_dup , .Nm RSA_meth_free , .Nm RSA_meth_get_finish , .Nm RSA_meth_set1_name , .Nm RSA_meth_set_finish , .Nm RSA_meth_set_priv_enc , .Nm RSA_meth_set_priv_dec .Nd build up RSA methods .Sh SYNOPSIS .In openssl/rsa.h .Ft RSA_METHOD * .Fo RSA_meth_new .Fa "const char *name" .Fa "int flags" .Fc .Ft RSA_METHOD * .Fo RSA_meth_dup .Fa "const RSA_METHOD *meth" .Fc .Ft void .Fo RSA_meth_free .Fa "RSA_METHOD *meth" .Fc .Ft int .Fo RSA_meth_set1_name .Fa "RSA_METHOD *meth" .Fa "const char *name" .Fc .Ft int .Fn "(*RSA_meth_get_finish(const RSA_METHOD *meth))" "RSA *rsa" .Ft int .Fo RSA_meth_set_finish .Fa "RSA_METHOD *meth" .Fa "int (*finish)(RSA *rsa)" .Fc .Ft int .Fo RSA_meth_set_priv_enc .Fa "RSA_METHOD *meth" .Fa "int (*priv_enc)(int flen, const unsigned char *from,\ unsigned char *to, RSA *rsa, int padding)" .Fc .Ft int .Fo RSA_meth_set_priv_dec .Fa "RSA_METHOD *meth" .Fa "int (*priv_dec)(int flen, const unsigned char *from,\ unsigned char *to, RSA *rsa, int padding)" .Fc .Sh DESCRIPTION The .Vt RSA_METHOD structure holds function pointers for custom RSA implementations. .Pp .Fn RSA_meth_new creates a new .Vt RSA_METHOD structure. A copy of the NUL-terminated .Fa name is stored in the new .Vt RSA_METHOD object. Any new .Vt RSA object constructed from this .Vt RSA_METHOD will have the given .Fa flags set by default. .Pp .Fn RSA_meth_dup creates a deep copy of .Fa meth . This might be useful for creating a new .Vt RSA_METHOD based on an existing one, but with some differences. .Pp .Fn RSA_meth_free destroys .Fa meth and frees any memory associated with it. .Pp .Fn RSA_meth_set1_name Stores a copy of the NUL-terminated .Fa name in the .Vt RSA_METHOD object after freeing the previously stored .Fa name . .Pp .Fn RSA_meth_get_finish and .Fn RSA_meth_set_finish get and set an optional function for destroying an .Vt RSA object. Unless .Fa finish is .Dv NULL , it will be called from .Xr RSA_free 3 . It takes the same argument and is intended to do RSA implementation specific cleanup. The memory used by the .Vt RSA object itself should not be freed by the .Fa finish function. .Pp .Fn RSA_meth_set_priv_enc and .Fn RSA_meth_set_priv_dec set the functions used for private key encryption and decryption. These functions will be called from .Xr RSA_private_decrypt 3 and .Xr RSA_private_encrypt 3 and take the same parameters as those. .Sh RETURN VALUES .Fn RSA_meth_new and .Fn RSA_meth_dup return the newly allocated .Vt RSA_METHOD object or .Dv NULL on failure. .Pp All .Fn RSA_meth_set* functions return 1 on success or 0 on failure. .Sh SEE ALSO .Xr RSA_new 3 , .Xr RSA_private_decrypt 3 , .Xr RSA_private_encrypt 3 , .Xr RSA_set_method 3 .Sh HISTORY These functions first appeared in OpenSSL 1.1.0. .Fn RSA_meth_get_finish and .Fn RSA_meth_set1_name have been available since .Ox 6.4 , all the other functions since .Ox 6.3 .