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.\" ========================================================================
.\"
.IX Title "EVP_PKEY_SET1_RSA 3"
.TH EVP_PKEY_SET1_RSA 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
EVP_PKEY_set1_RSA, EVP_PKEY_set1_DSA, EVP_PKEY_set1_DH, EVP_PKEY_set1_EC_KEY, EVP_PKEY_get1_RSA, EVP_PKEY_get1_DSA, EVP_PKEY_get1_DH, EVP_PKEY_get1_EC_KEY, EVP_PKEY_get0_RSA, EVP_PKEY_get0_DSA, EVP_PKEY_get0_DH, EVP_PKEY_get0_EC_KEY, EVP_PKEY_assign_RSA, EVP_PKEY_assign_DSA, EVP_PKEY_assign_DH, EVP_PKEY_assign_EC_KEY, EVP_PKEY_assign_POLY1305, EVP_PKEY_assign_SIPHASH, EVP_PKEY_get0_hmac, EVP_PKEY_get0_poly1305, EVP_PKEY_get0_siphash, EVP_PKEY_type, EVP_PKEY_id, EVP_PKEY_base_id, EVP_PKEY_set_alias_type, EVP_PKEY_set1_engine, EVP_PKEY_get0_engine \- EVP_PKEY assignment functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key);
\& int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key);
\& int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key);
\& int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key);
\&
\& RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey);
\& DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey);
\& DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey);
\& EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey);
\&
\& const unsigned char *EVP_PKEY_get0_hmac(const EVP_PKEY *pkey, size_t *len);
\& const unsigned char *EVP_PKEY_get0_poly1305(const EVP_PKEY *pkey, size_t *len);
\& const unsigned char *EVP_PKEY_get0_siphash(const EVP_PKEY *pkey, size_t *len);
\& RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey);
\& DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey);
\& DH *EVP_PKEY_get0_DH(EVP_PKEY *pkey);
\& EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey);
\&
\& int EVP_PKEY_assign_RSA(EVP_PKEY *pkey, RSA *key);
\& int EVP_PKEY_assign_DSA(EVP_PKEY *pkey, DSA *key);
\& int EVP_PKEY_assign_DH(EVP_PKEY *pkey, DH *key);
\& int EVP_PKEY_assign_EC_KEY(EVP_PKEY *pkey, EC_KEY *key);
\& int EVP_PKEY_assign_POLY1305(EVP_PKEY *pkey, ASN1_OCTET_STRING *key);
\& int EVP_PKEY_assign_SIPHASH(EVP_PKEY *pkey, ASN1_OCTET_STRING *key);
\&
\& int EVP_PKEY_id(const EVP_PKEY *pkey);
\& int EVP_PKEY_base_id(const EVP_PKEY *pkey);
\& int EVP_PKEY_type(int type);
\& int EVP_PKEY_set_alias_type(EVP_PKEY *pkey, int type);
\&
\& ENGINE *EVP_PKEY_get0_engine(const EVP_PKEY *pkey);
\& int EVP_PKEY_set1_engine(EVP_PKEY *pkey, ENGINE *engine);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIEVP_PKEY_set1_RSA()\fR, \fIEVP_PKEY_set1_DSA()\fR, \fIEVP_PKEY_set1_DH()\fR and
\&\fIEVP_PKEY_set1_EC_KEY()\fR set the key referenced by \fBpkey\fR to \fBkey\fR.
.PP
\&\fIEVP_PKEY_get1_RSA()\fR, \fIEVP_PKEY_get1_DSA()\fR, \fIEVP_PKEY_get1_DH()\fR and
\&\fIEVP_PKEY_get1_EC_KEY()\fR return the referenced key in \fBpkey\fR or
\&\fB\s-1NULL\s0\fR if the key is not of the correct type.
.PP
\&\fIEVP_PKEY_get0_hmac()\fR, \fIEVP_PKEY_get0_poly1305()\fR, \fIEVP_PKEY_get0_siphash()\fR,
\&\fIEVP_PKEY_get0_RSA()\fR, \fIEVP_PKEY_get0_DSA()\fR, \fIEVP_PKEY_get0_DH()\fR
and \fIEVP_PKEY_get0_EC_KEY()\fR also return the referenced key in \fBpkey\fR or \fB\s-1NULL\s0\fR
if the key is not of the correct type but the reference count of the
returned key is \fBnot\fR incremented and so must not be freed up after use.
.PP
\&\fIEVP_PKEY_assign_RSA()\fR, \fIEVP_PKEY_assign_DSA()\fR, \fIEVP_PKEY_assign_DH()\fR,
\&\fIEVP_PKEY_assign_EC_KEY()\fR, \fIEVP_PKEY_assign_POLY1305()\fR and
\&\fIEVP_PKEY_assign_SIPHASH()\fR also set the referenced key to \fBkey\fR
however these use the supplied \fBkey\fR internally and so \fBkey\fR
will be freed when the parent \fBpkey\fR is freed.
.PP
\&\fIEVP_PKEY_base_id()\fR returns the type of \fBpkey\fR. For example
an \s-1RSA\s0 key will return \fB\s-1EVP_PKEY_RSA\s0\fR.
.PP
\&\fIEVP_PKEY_id()\fR returns the actual \s-1OID\s0 associated with \fBpkey\fR. Historically keys
using the same algorithm could use different OIDs. For example an \s-1RSA\s0 key could
use the OIDs corresponding to the NIDs \fBNID_rsaEncryption\fR (equivalent to
\&\fB\s-1EVP_PKEY_RSA\s0\fR) or \fBNID_rsa\fR (equivalent to \fB\s-1EVP_PKEY_RSA2\s0\fR). The use of
alternative non-standard OIDs is now rare so \fB\s-1EVP_PKEY_RSA2\s0\fR et al are not
often seen in practice.
.PP
\&\fIEVP_PKEY_type()\fR returns the underlying type of the \s-1NID \s0\fBtype\fR. For example
EVP_PKEY_type(\s-1EVP_PKEY_RSA2\s0) will return \fB\s-1EVP_PKEY_RSA\s0\fR.
.PP
\&\fIEVP_PKEY_get0_engine()\fR returns a reference to the \s-1ENGINE\s0 handling \fBpkey\fR.
.PP
\&\fIEVP_PKEY_set1_engine()\fR sets the \s-1ENGINE\s0 handling \fBpkey\fR to \fBengine\fR. It
must be called after the key algorithm and components are set up.
If \fBengine\fR does not include an \fB\s-1EVP_PKEY_METHOD\s0\fR for \fBpkey\fR an
error occurs.
.PP
\&\fIEVP_PKEY_set_alias_type()\fR allows modifying a \s-1EVP_PKEY\s0 to use a
different set of algorithms than the default. This is currently used
to support \s-1SM2\s0 keys, which use an identical encoding to \s-1ECDSA.\s0
.SH "NOTES"
.IX Header "NOTES"
In accordance with the OpenSSL naming convention the key obtained
from or assigned to the \fBpkey\fR using the \fB1\fR functions must be
freed as well as \fBpkey\fR.
.PP
\&\fIEVP_PKEY_assign_RSA()\fR, \fIEVP_PKEY_assign_DSA()\fR, \fIEVP_PKEY_assign_DH()\fR,
\&\fIEVP_PKEY_assign_EC_KEY()\fR, \fIEVP_PKEY_assign_POLY1305()\fR
and \fIEVP_PKEY_assign_SIPHASH()\fR are implemented as macros.
.PP
Most applications wishing to know a key type will simply call
\&\fIEVP_PKEY_base_id()\fR and will not care about the actual type:
which will be identical in almost all cases.
.PP
Previous versions of this document suggested using EVP_PKEY_type(pkey\->type)
to determine the type of a key. Since \fB\s-1EVP_PKEY\s0\fR is now opaque this
is no longer possible: the equivalent is EVP_PKEY_base_id(pkey).
.PP
\&\fIEVP_PKEY_set1_engine()\fR is typically used by an \s-1ENGINE\s0 returning an \s-1HSM\s0
key as part of its routine to load a private key.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIEVP_PKEY_set1_RSA()\fR, \fIEVP_PKEY_set1_DSA()\fR, \fIEVP_PKEY_set1_DH()\fR and
\&\fIEVP_PKEY_set1_EC_KEY()\fR return 1 for success or 0 for failure.
.PP
\&\fIEVP_PKEY_get1_RSA()\fR, \fIEVP_PKEY_get1_DSA()\fR, \fIEVP_PKEY_get1_DH()\fR and
\&\fIEVP_PKEY_get1_EC_KEY()\fR return the referenced key or \fB\s-1NULL\s0\fR if
an error occurred.
.PP
\&\fIEVP_PKEY_assign_RSA()\fR, \fIEVP_PKEY_assign_DSA()\fR, \fIEVP_PKEY_assign_DH()\fR,
\&\fIEVP_PKEY_assign_EC_KEY()\fR, \fIEVP_PKEY_assign_POLY1305()\fR
and \fIEVP_PKEY_assign_SIPHASH()\fR return 1 for success and 0 for failure.
.PP
\&\fIEVP_PKEY_base_id()\fR, \fIEVP_PKEY_id()\fR and \fIEVP_PKEY_type()\fR return a key
type or \fBNID_undef\fR (equivalently \fB\s-1EVP_PKEY_NONE\s0\fR) on error.
.PP
\&\fIEVP_PKEY_set1_engine()\fR returns 1 for success and 0 for failure.
.PP
\&\fIEVP_PKEY_set_alias_type()\fR returns 1 for success and 0 for error.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
After loading an \s-1ECC\s0 key, it is possible to convert it to using \s-1SM2\s0
algorithms with EVP_PKEY_set_alias_type:
.PP
.Vb 1
\& EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2);
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIEVP_PKEY_new\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2002\-2019 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>.

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