.\" $OpenBSD: des_read_pw.3,v 1.12 2024/08/24 07:48:37 tb Exp $ .\" full merge up to: OpenSSL doc/crypto/des.pod .\" 53934822 Jun 9 16:39:19 2016 -0400 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2023 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. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: August 24 2024 $ .Dt DES_READ_PW 3 .Os .Sh NAME .Nm EVP_read_pw_string , .Nm EVP_read_pw_string_min , .Nm EVP_set_pw_prompt , .Nm EVP_get_pw_prompt .Nd compatibility user interface functions .Sh SYNOPSIS .In openssl/evp.h .Ft int .Fo EVP_read_pw_string .Fa "char *buf" .Fa "int length" .Fa "const char *prompt" .Fa "int verify" .Fc .Ft int .Fo EVP_read_pw_string_min .Fa "char *buf" .Fa "int min_length" .Fa "int length" .Fa "const char *prompt" .Fa "int verify" .Fc .Ft void .Fo EVP_set_pw_prompt .Fa "const char *default_prompt" .Fc .Ft char * .Fn EVP_get_pw_prompt void .Sh DESCRIPTION .Fn EVP_read_pw_string writes the .Fa prompt to .Pa /dev/tty , or, if that could not be opened, to standard output, turns echo off, and reads an input string from .Pa /dev/tty , or, if that could not be opened, from standard input. The string is returned in .Fa buf , which must have space for at least .Fa length bytes. If the .Fa length argument exceeds .Dv BUFSIZ , .Dv BUFSIZ is used instead. If .Fa verify is set, the user is asked for the password twice and unless the two copies match, an error is returned. .Pp .Fn EVP_read_pw_string_min additionally checks that the password is at least .Fa min_length bytes long. .Pp .Fn EVP_set_pw_prompt sets a default prompt to a copy of .Fa default_prompt , or clears the default prompt if the .Fa default_prompt argument is .Dv NULL or an empty string. If the .Fa default_prompt argument is longer than 79 bytes, the copy is silently truncated to a string length of 79 bytes. .Pp As long as a default prompt is set, .Fn EVP_read_pw_string and .Fn EVP_read_pw_string_min can be called with a .Fa prompt argument of .Dv NULL , in which case the default prompt is used instead. .Sh RETURN VALUES .Fn EVP_read_pw_string and .Fn EVP_read_pw_string_min return 0 on success or a negative value on failure. .Pp They return \-1 if .Fa length is less than or equal to zero or on memory allocation failure. They return \-1 or \-2 if the internal call to .Xr UI_process 3 fails. .Pp In addition, .Fa EVP_read_pw_string_min returns \-1 if .Fa min_length is negative, if .Fa length is less than or equal to .Fa min_length , or if the user entered a password shorter than .Fa min_length . .Pp .Fn EVP_get_pw_prompt returns an internal pointer to static memory containing the default prompt, or .Dv NULL if no default prompt is set. .Sh SEE ALSO .Xr UI_new 3 .Sh HISTORY .Fn EVP_read_pw_string first appeared in SSLeay 0.5.1 and .Fn EVP_set_pw_prompt and .Fn EVP_get_pw_prompt in SSLeay 0.6.0. These functions have been available since .Ox 2.4 . .Pp .Fn EVP_read_pw_string_min first appeared in OpenSSL 1.0.0 and has been available since .Ox 4.9 .