Document EVP_PKEY_CTX_set0_keygen_info(3).

While here, also add the missing RETURN VALUES entries
for EVP_PKEY_gen_cb(3), EVP_PKEY_CTX_get_cb(3),
and EVP_PKEY_CTX_get_keygen_info(3).

1 files changed, 59 insertions, 10 deletions

diff --git a/lib/libcrypto/man/EVP_PKEY_keygen.3 b/lib/libcrypto/man/EVP_PKEY_keygen.3
index aae994541fb..7641dba5a2e 100644
--- a/lib/libcrypto/man/EVP_PKEY_keygen.3
+++ b/lib/libcrypto/man/EVP_PKEY_keygen.3
@@ -1,8 +1,24 @@
-.\" $OpenBSD: EVP_PKEY_keygen.3,v 1.11 2023/04/25 16:50:33 tb Exp $
-.\" full merge up to: OpenSSL e9b77246 Jan 20 19:58:49 2017 +0100
-.\" selective merge up to: OpenSSL 48e5119a Jan 19 10:49:22 2018 +0100
+.\" $OpenBSD: EVP_PKEY_keygen.3,v 1.12 2023/09/09 14:31:38 schwarze Exp $
+.\" full merge up to: OpenSSL 24a535ea Sep 22 13:14:20 2020 +0100
 .\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
+.\" This file is a derived work.
+.\" The changes are covered by the following Copyright and license:
+.\"
+.\" 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.
+.\"
+.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
 .\" Copyright (c) 2006, 2009, 2013, 2015, 2016, 2018 The OpenSSL Project.
 .\" All rights reserved.
 .\"
@@ -50,7 +66,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: April 25 2023 $
+.Dd $Mdocdate: September 9 2023 $
 .Dt EVP_PKEY_KEYGEN 3
 .Os
 .Sh NAME
@@ -61,6 +77,7 @@
 .Nm EVP_PKEY_gen_cb ,
 .Nm EVP_PKEY_CTX_set_cb ,
 .Nm EVP_PKEY_CTX_get_cb ,
+.Nm EVP_PKEY_CTX_set0_keygen_info ,
 .Nm EVP_PKEY_CTX_get_keygen_info ,
 .Nm EVP_PKEY_CTX_set_app_data ,
 .Nm EVP_PKEY_CTX_get_app_data
@@ -98,6 +115,12 @@
 .Fo EVP_PKEY_CTX_get_cb
 .Fa "EVP_PKEY_CTX *ctx"
 .Fc
+.Ft void
+.Fo EVP_PKEY_CTX_set0_keygen_info
+.Fa "EVP_PKEY_CTX *ctx"
+.Fa "int *dat"
+.Fa "int datlen"
+.Fc
 .Ft int
 .Fo EVP_PKEY_CTX_get_keygen_info
 .Fa "EVP_PKEY_CTX *ctx"
@@ -131,13 +154,22 @@ and
 .Fn EVP_PKEY_paramgen
 are similar except parameters are generated.
 .Pp
-The function
+The functions
 .Fn EVP_PKEY_CTX_set_cb
-sets the key or parameter generation callback to
-.Fa cb .
-The function
+and
 .Fn EVP_PKEY_CTX_get_cb
-returns the key or parameter generation callback.
+set and retrieve the key or parameter generation callback, respectively.
+.Pp
+The function
+.Fn EVP_PKEY_CTX_set0_keygen_info
+sets the parameters associated with the generation operation to the array
+.Fa dat
+containing
+.Ft datlen
+integer parameters.
+The caller retains ownership of the
+.Fa dat
+array; it will never be freed by the library.
 .Pp
 The function
 .Fn EVP_PKEY_CTX_get_keygen_info
@@ -209,6 +241,23 @@ and
 return 1 for success and 0 or a negative value for failure.
 In particular, a return value of -2 indicates the operation is not
 supported by the public key algorithm.
+.Pp
+Callback functions of the type
+.Fn EVP_PKEY_gen_cb
+are supposed to return 1 on success or 0 on error.
+.Pp
+.Fn EVP_PKEY_CTX_get_cb
+returns a function pointer to the currently installed callback function or
+.Dv NULL
+if no callback function is installed.
+.Pp
+.Fn EVP_PKEY_CTX_get_keygen_info
+retuns the number of available parameters if
+.Fa idx
+is \-1, one of these parameters if
+.Fa idx
+is greater than or equal to zero but less than the number
+of available parameters, or 0 otherwise.
 .Sh EXAMPLES
 Generate a 2048-bit RSA key:
 .Bd -literal -offset indent