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libssh2/docs/libssh2_userauth_publickey_frommemory.md
Viktor Szakats b889b39945 docs: convert man page sources to "curldown" format
To render in Git webviews as-is, to make it easier to edit, verify,
and to sync up with curl.

- add options to not build the `.3` man pages:
  - autotools: `--disable-docs`
  - cmake: `LIBSSH2_BUILD_DOCS=OFF`
- building `.3` man pages requires Perl after this patch.
- drop `mansyntax` and the shell / `grep` / GNU `man` tool requirements with it.
- scripts and most logic were copied from curl.
- add `cd2nroff` from curl, with edits to relax curl-specific checks.
- used `nroff2cd` (from curl) to convert from `.3` to `.md`. Then
  manually fixed copyrights, inline function references and a couple
  of other things.

Credits-to: Daniel Stenberg

Ref: eefcc1bda4
Ref: https://github.com/curl/curl/pull/12730
Ref: https://github.com/libssh2/www/issues/25#issuecomment-3289431671

Closes #1660
2025-10-09 04:05:38 +02:00

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2.3 KiB
Markdown

---
c: Copyright (C) The libssh2 project and its contributors.
SPDX-License-Identifier: BSD-3-Clause
Title: libssh2_userauth_publickey_frommemory
Section: 3
Source: libssh2
See-also:
- libssh2_session_init_ex(3)
---
# NAME
libssh2_userauth_publickey_frommemory - authenticate a session with a public key, read from memory
# SYNOPSIS
~~~c
#include <libssh2.h>
int
libssh2_userauth_publickey_frommemory(LIBSSH2_SESSION *session,
const char *username,
size_t username_len,
const char *publickeydata,
size_t publickeydata_len,
const char *privatekeydata,
size_t privatekeydata_len,
const char *passphrase);
~~~
# DESCRIPTION
*session* - Session instance as returned by libssh2_session_init_ex(3)
*username* - Remote user name to authenticate as.
*username_len* - Length of username.
*publickeydata* - Buffer containing the contents of a public key file.
*publickeydata_len* - Length of public key data.
*privatekeydata* - Buffer containing the contents of a private key file.
*privatekeydata_len* - Length of private key data.
*passphrase* - Passphrase to use when decoding private key file.
Attempt public key authentication using either a public key file or a PEM
encoded private key file stored in memory. When providing a private key, the
public key is automatically extracted from it. When providing both, the
passed public key takes precedence.
# RETURN VALUE
Return 0 on success or negative on failure. It returns
LIBSSH2_ERROR_EAGAIN when it would otherwise block. While
LIBSSH2_ERROR_EAGAIN is a negative number, it is not really a failure per se.
# ERRORS
*LIBSSH2_ERROR_ALLOC* - An internal memory allocation call failed.
*LIBSSH2_ERROR_SOCKET_SEND* - Unable to send data on socket.
*LIBSSH2_ERROR_SOCKET_TIMEOUT* -
*LIBSSH2_ERROR_PUBLICKEY_UNVERIFIED* - The username/public key
combination was invalid.
*LIBSSH2_ERROR_AUTHENTICATION_FAILED* - Authentication using the supplied
public key was not accepted.
# AVAILABILITY
libssh2_userauth_publickey_frommemory was added in libssh2 1.6.0
Supported with OpenSSL, WinCNG, mbedTLS, OS/400 crypto backends.