.\" $OpenBSD: ENGINE_set_RSA.3,v 1.7 2023/07/21 04:29:27 tb Exp $ .\" content checked up to: .\" OpenSSL ENGINE_add 1f13ad31 Dec 25 17:50:39 2017 +0800 .\" .\" 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. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .Dd $Mdocdate: July 21 2023 $ .Dt ENGINE_SET_RSA 3 .Os .Sh NAME .Nm ENGINE_set_RSA , .Nm ENGINE_get_RSA , .Nm ENGINE_set_DSA , .Nm ENGINE_get_DSA , .Nm ENGINE_set_EC , .Nm ENGINE_get_EC , .Nm ENGINE_set_DH , .Nm ENGINE_get_DH , .Nm ENGINE_set_RAND , .Nm ENGINE_get_RAND , .Nm ENGINE_set_STORE , .Nm ENGINE_get_STORE , .Nm ENGINE_set_ciphers , .Nm ENGINE_get_ciphers , .Nm ENGINE_get_cipher , .Nm ENGINE_set_digests , .Nm ENGINE_get_digests , .Nm ENGINE_get_digest .Nd install and retrieve function tables of crypto engines .Sh SYNOPSIS .In openssl/engine.h .Ft int .Fo ENGINE_set_RSA .Fa "ENGINE *e" .Fa "const RSA_METHOD *rsa_meth" .Fc .Ft const RSA_METHOD * .Fo ENGINE_get_RSA .Fa "const ENGINE *e" .Fc .Ft int .Fo ENGINE_set_DSA .Fa "ENGINE *e" .Fa "const DSA_METHOD *dsa_meth" .Fc .Ft const DSA_METHOD * .Fo ENGINE_get_DSA .Fa "const ENGINE *e" .Fc .Ft int .Fo ENGINE_set_EC .Fa "ENGINE *e" .Fa "const EC_KEY_METHOD *ec_meth" .Fc .Ft const EC_KEY_METHOD * .Fo ENGINE_get_EC .Fa "const ENGINE *e" .Fc .Ft int .Fo ENGINE_set_DH .Fa "ENGINE *e" .Fa "const DH_METHOD *dh_meth" .Fc .Ft const DH_METHOD * .Fo ENGINE_get_DH .Fa "const ENGINE *e" .Fc .Ft int .Fo ENGINE_set_RAND .Fa "ENGINE *e" .Fa "const RAND_METHOD *rand_meth" .Fc .Ft const RAND_METHOD * .Fo ENGINE_get_RAND .Fa "const ENGINE *e" .Fc .Ft int .Fo ENGINE_set_STORE .Fa "ENGINE *e" .Fa "const STORE_METHOD *rand_meth" .Fc .Ft const STORE_METHOD * .Fo ENGINE_get_STORE .Fa "const ENGINE *e" .Fc .Ft typedef int .Fo (*ENGINE_CIPHERS_PTR) .Fa "ENGINE *e" .Fa "const EVP_CIPHER **impl" .Fa "const int **nids" .Fa "int nid" .Fc .Ft int .Fo ENGINE_set_ciphers .Fa "ENGINE *e" .Fa "ENGINE_CIPHERS_PTR f" .Fc .Ft ENGINE_CIPHERS_PTR .Fo ENGINE_get_ciphers .Fa "const ENGINE *e" .Fc .Ft const EVP_CIPHER * .Fo ENGINE_get_cipher .Fa "ENGINE *e" .Fa "int nid" .Fc .Ft typedef int .Fo (*ENGINE_DIGESTS_PTR) .Fa "ENGINE *e" .Fa "const EVP_MD **impl" .Fa "const int **nids" .Fa "int nid" .Fc .Ft int .Fo ENGINE_set_digests .Fa "ENGINE *e" .Fa "ENGINE_DIGESTS_PTR f" .Fc .Ft ENGINE_DIGESTS_PTR .Fo ENGINE_get_digests .Fa "const ENGINE *e" .Fc .Ft const EVP_MD * .Fo ENGINE_get_digest .Fa "ENGINE *e" .Fa "int nid" .Fc .Sh DESCRIPTION The .Fn ENGINE_set_* functions install a table of function pointers implementing the respective algorithm in .Fa e . Partial information about the various method objects is available from .Xr RSA_meth_new 3 , .Xr RSA_get_default_method 3 , .Xr DSA_meth_new 3 , .Xr DSA_get_default_method 3 , .Xr EC_KEY_get_default_method 3 , .Xr DH_get_default_method 3 , .Xr RAND_get_rand_method 3 , .Xr EVP_get_cipherbynid 3 , and .Xr EVP_get_digestbynid 3 . .Vt STORE_METHOD is an incomplete type, and the pointers to it are not used for anything. For complete descriptions of these types, refer to the respective header files. .Pp The functions described in the .Xr ENGINE_register_RSA 3 and .Xr ENGINE_set_default 3 manual pages only have an effect after function pointers were installed using the functions described here. .Pp .Fn ENGINE_set_ciphers and .Fn ENGINE_set_digests are special in so far as the .Vt ENGINE structure does not provide fields to store function pointers implementing ciphers or digests. Instead, these two functions only install a callback to retrieve implementations. Where the pointers to the implementations are stored internally, how they get initialized, and how the .Vt ENGINE_CIPHERS_PTR and .Vt ENGINE_DIGESTS_PTR callbacks retrieve them is up to the implementation of each individual engine. .Pp If the .Vt ENGINE_CIPHERS_PTR and .Vt ENGINE_DIGESTS_PTR callbacks are called with a non-zero .Fa nid , they retrieve the implementation of that cipher or digest, respectively. In this case, a .Dv NULL pointer can be passed as the .Fa nids argument. .Fn ENGINE_get_cipher and .Fn ENGINE_get_digest call the callbacks installed in .Fa e in this way. .Pp If 0 is passed as the .Fa nid argument, an internal pointer to the array of implementations available in .Fa e is returned in .Pf * Fa impl , and an internal pointer to the array of corresponding identifiers in .Pf * Fa nids . The return value of the callback indicates the number of implementations returned. .Pp The .Fn ENGINE_get_* functions retrieve the previously installed function tables. They are used when constructing basic cryptographic objects as shown in the following table: .Bl -column "ENGINE_get_digestMM" .It Accessor: Ta Called by: .It Fn ENGINE_get_RSA Ta Xr RSA_new_method 3 , Xr RSA_new 3 .It Fn ENGINE_get_DSA Ta Xr DSA_new_method 3 , Xr DSA_new 3 .It Fn ENGINE_get_EC Ta Xr EC_KEY_new_method 3 , Xr EC_KEY_new 3 , .Xr EC_KEY_new_by_curve_name 3 .It Fn ENGINE_get_DH Ta Xr DH_new_method 3 , Xr DH_new 3 .It Fn ENGINE_get_RAND Ta unused .It Fn ENGINE_get_STORE Ta unused .It Fn ENGINE_get_cipher Ta Xr EVP_CipherInit_ex 3 .It Fn ENGINE_get_digest Ta Xr EVP_DigestInit_ex 3 .El .Sh RETURN VALUES The .Fn ENGINE_set_* functions return 1 on success or 0 on error. Currently, they cannot fail. .Pp The .Fn ENGINE_get_* functions return a method object for the respective algorithm, or .Dv NULL if none is installed. .Pp .Fn ENGINE_get_ciphers and .Fn ENGINE_get_digests return a function pointer to the respective callback, or .Dv NULL if none is installed. .Pp .Fn ENGINE_get_cipher returns an .Vt EVP_CIPHER object implementing the cipher .Fa nid or .Dv NULL if .Fa e does not implement that cipher. .Pp .Fn ENGINE_get_digest returns an .Vt EVP_MD object implementing the digest .Fa nid or .Dv NULL if .Fa e does not implement that digest. .Sh SEE ALSO .Xr DSA_new 3 , .Xr ENGINE_ctrl 3 , .Xr ENGINE_new 3 , .Xr ENGINE_register_RSA 3 , .Xr ENGINE_set_default 3 , .Xr ENGINE_set_flags 3 , .Xr EVP_DigestInit 3 , .Xr EVP_EncryptInit 3 , .Xr RSA_new 3 .Sh HISTORY .Fn ENGINE_set_RSA , .Fn ENGINE_get_RSA , .Fn ENGINE_set_DSA , .Fn ENGINE_get_DSA , .Fn ENGINE_set_DH , .Fn ENGINE_get_DH , .Fn ENGINE_set_RAND , .Fn ENGINE_get_RAND , first appeared in OpenSSL 0.9.7 and have been available since .Ox 2.9 . .Pp .Fn ENGINE_set_ciphers , .Fn ENGINE_get_ciphers , .Fn ENGINE_get_cipher , .Fn ENGINE_set_digests , .Fn ENGINE_get_digests , and .Fn ENGINE_get_digest first appeared in OpenSSL 0.9.7 and have been available since .Ox 3.2 . .Pp .Fn ENGINE_set_STORE and .Fn ENGINE_get_STORE first appeared in OpenSSL 0.9.8 and have been available since .Ox 4.5 . .Fn ENGINE_set_EC and .Fn ENGINE_get_EC first appeared in OpenSSL 1.1.0 and have been available since .Ox 6.5 .