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.\" $OpenBSD: EVP_PKEY_CTX_get_operation.3,v 1.3 2023/09/12 16:15:23 schwarze Exp $
.\"
.\" Copyright (c) 2023 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" 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: September 12 2023 $
.Dt EVP_PKEY_CTX_GET_OPERATION 3
.Os
.Sh NAME
.Nm EVP_PKEY_CTX_get_operation ,
.Nm EVP_PKEY_CTX_get0_pkey
.Nd inspect EVP_PKEY_CTX objects
.Sh SYNOPSIS
.In openssl/evp.h
.Ft int
.Fo EVP_PKEY_CTX_get_operation
.Fa "EVP_PKEY_CTX *ctx"
.Fc
.Ft EVP_PKEY *
.Fo EVP_PKEY_CTX_get0_pkey
.Fa "EVP_PKEY_CTX *ctx"
.Fc
.Sh DESCRIPTION
.Fn EVP_PKEY_CTX_get_operation
finds out which initialization function has been called on
.Fa ctx ,
if any:
.Bl -column EVP_PKEY_OP_VERIFYRECO EVP_PKEY_verify_recover_init
.It return value Ta initialized with Ta e.g. for
.It Dv EVP_PKEY_OP_DECRYPT Ta Xr EVP_PKEY_decrypt_init 3 Ta RSA, SM2
.It Dv EVP_PKEY_OP_DERIVE Ta Xr EVP_PKEY_derive_init 3 Ta HKDF
.It Dv EVP_PKEY_OP_ENCRYPT Ta Xr EVP_PKEY_encrypt_init 3 Ta RSA, SM2
.It Dv EVP_PKEY_OP_KEYGEN Ta Xr EVP_PKEY_keygen_init 3 Ta almost all
.It Dv EVP_PKEY_OP_PARAMGEN Ta Xr EVP_PKEY_paramgen_init 3 Ta DH, DSA, EC
.It Dv EVP_PKEY_OP_SIGN Ta Xr EVP_PKEY_sign_init 3 Ta DSA,EC,RSA,SM2
.It Dv EVP_PKEY_OP_SIGN Ta Xr EVP_DigestSignInit 3 Ta ED25519
.It Dv EVP_PKEY_OP_SIGNCTX Ta Xr EVP_DigestSignInit 3 Ta CMAC, HMAC
.It Dv EVP_PKEY_OP_UNDEFINED Ta not initialized Ta NONE
.It Dv EVP_PKEY_OP_VERIFY Ta Xr EVP_PKEY_verify_init 3 Ta DSA,EC,RSA,SM2
.It Dv EVP_PKEY_OP_VERIFY Ta Xr EVP_DigestVerifyInit 3 Ta ED25519
.It Dv EVP_PKEY_OP_VERIFYCTX Ta Xr EVP_DigestVerifyInit 3 Ta no built-in
.It Dv EVP_PKEY_OP_VERIFYRECOVER Ta Xr EVP_PKEY_verify_recover_init 3 Ta RSA
.El
.Pp
The rightmost column of the above table shows examples of algorithms
the return values can occur for.
For example, if
.Xr EVP_PKEY_base_id 3
returns
.Dv EVP_PKEY_HKDF ,
then calling
.Fn EVP_PKEY_CTX_get_operation
on a
.Vt EVP_PKEY_CTX
using that key may return
.Dv EVP_PKEY_OP_DERIVE .
.Pp
If the return value is
.Dv EVP_PKEY_OP_SIGNCTX
or
.Dv EVP_PKEY_OP_VERIFYCTX ,
the
.Fa ctx
supports
.Xr EVP_DigestSignUpdate 3
or
.Xr EVP_DigestVerifyUpdate 3 ,
respectively.
If the return value is
.Dv EVP_PKEY_OP_SIGN
or
.Dv EVP_PKEY_OP_VERIFY ,
if does not, and only one-shot signing or verification is supported.
.Pp
The return value
.Dv EVP_PKEY_OP_UNDEFINED
can for example occur if the
.Fa ctx
was freshly returned from
.Xr EVP_PKEY_CTX_new 3
or
.Xr EVP_PKEY_CTX_new_id 3
and not yet initialized.
.Pp
The following masks are defined as the logical OR of two or more of the above
.Dv EVP_PKEY_OP_*
bits:
.Pp
.Bl -tag -width EVP_PKEY_OP_TYPE_NOGEN -compact
.It Dv EVP_PKEY_OP_TYPE_CRYPT
DECRYPT | ENCRYPT
.It Dv EVP_PKEY_OP_TYPE_GEN
KEYGEN | PARAMGEN
.It Dv EVP_PKEY_OP_TYPE_NOGEN
CRYPT | DERIVE | SIG
.It Dv EVP_PKEY_OP_TYPE_SIG
SIGN | SIGNCTX | VERIFY | VERIFYCTX | VERIFYRECOVER
.El
.Sh RETURN VALUES
.Fn EVP_PKEY_CTX_get_operation
returns one of the single-bit
.Dv EVP_PKEY_OP_*
constants or
.Dv EVP_PKEY_OP_UNDEFINED
if
.Fa ctx
is not initialized.
.Pp
.Fn EVP_PKEY_CTX_get0_pkey
returns an internal pointer to the
.Vt EVP_PKEY
object used by
.Fa ctx ,
without incrementing its reference count.
.Sh SEE ALSO
.Xr evp 3 ,
.Xr EVP_PKEY_base_id 3 ,
.Xr EVP_PKEY_CTX_ctrl 3 ,
.Xr EVP_PKEY_CTX_new 3 ,
.Xr EVP_PKEY_new 3
.Sh HISTORY
.Fn EVP_PKEY_CTX_get_operation
and
.Fn EVP_PKEY_CTX_get0_pkey
first appeared in OpenSSL 1.0.0 and have been available since
.Ox 4.9 .
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