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1.\" $OpenBSD: des_read_pw.3,v 1.12 2024/08/24 07:48:37 tb Exp $
2.\" full merge up to: OpenSSL doc/crypto/des.pod
3.\" 53934822 Jun 9 16:39:19 2016 -0400
4.\"
5.\" This file is a derived work.
6.\" The changes are covered by the following Copyright and license:
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8.\" Copyright (c) 2023 Ingo Schwarze <schwarze@openbsd.org>
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21.\"
22.\" The original file was written by Ulf Moeller <ulf@openssl.org>.
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69.Dd $Mdocdate: August 24 2024 $
70.Dt DES_READ_PW 3
71.Os
72.Sh NAME
73.Nm EVP_read_pw_string ,
74.Nm EVP_read_pw_string_min ,
75.Nm EVP_set_pw_prompt ,
76.Nm EVP_get_pw_prompt
77.Nd compatibility user interface functions
78.Sh SYNOPSIS
79.In openssl/evp.h
80.Ft int
81.Fo EVP_read_pw_string
82.Fa "char *buf"
83.Fa "int length"
84.Fa "const char *prompt"
85.Fa "int verify"
86.Fc
87.Ft int
88.Fo EVP_read_pw_string_min
89.Fa "char *buf"
90.Fa "int min_length"
91.Fa "int length"
92.Fa "const char *prompt"
93.Fa "int verify"
94.Fc
95.Ft void
96.Fo EVP_set_pw_prompt
97.Fa "const char *default_prompt"
98.Fc
99.Ft char *
100.Fn EVP_get_pw_prompt void
101.Sh DESCRIPTION
102.Fn EVP_read_pw_string
103writes the
104.Fa prompt
105to
106.Pa /dev/tty ,
107or, if that could not be opened, to standard output, turns echo off,
108and reads an input string from
109.Pa /dev/tty ,
110or, if that could not be opened, from standard input.
111The string is returned in
112.Fa buf ,
113which must have space for at least
114.Fa length
115bytes.
116If the
117.Fa length
118argument exceeds
119.Dv BUFSIZ ,
120.Dv BUFSIZ
121is used instead.
122If
123.Fa verify
124is set, the user is asked for the password twice and unless the two
125copies match, an error is returned.
126.Pp
127.Fn EVP_read_pw_string_min
128additionally checks that the password is at least
129.Fa min_length
130bytes long.
131.Pp
132.Fn EVP_set_pw_prompt
133sets a default prompt to a copy of
134.Fa default_prompt ,
135or clears the default prompt if the
136.Fa default_prompt
137argument is
138.Dv NULL
139or an empty string.
140If the
141.Fa default_prompt
142argument is longer than 79 bytes,
143the copy is silently truncated to a string length of 79 bytes.
144.Pp
145As long as a default prompt is set,
146.Fn EVP_read_pw_string
147and
148.Fn EVP_read_pw_string_min
149can be called with a
150.Fa prompt
151argument of
152.Dv NULL ,
153in which case the default prompt is used instead.
154.Sh RETURN VALUES
155.Fn EVP_read_pw_string
156and
157.Fn EVP_read_pw_string_min
158return 0 on success or a negative value on failure.
159.Pp
160They return \-1 if
161.Fa length
162is less than or equal to zero or on memory allocation failure.
163They return \-1 or \-2 if the internal call to
164.Xr UI_process 3
165fails.
166.Pp
167In addition,
168.Fa EVP_read_pw_string_min
169returns \-1 if
170.Fa min_length
171is negative, if
172.Fa length
173is less than or equal to
174.Fa min_length ,
175or if the user entered a password shorter than
176.Fa min_length .
177.Pp
178.Fn EVP_get_pw_prompt
179returns an internal pointer to static memory containing the default prompt, or
180.Dv NULL
181if no default prompt is set.
182.Sh SEE ALSO
183.Xr UI_new 3
184.Sh HISTORY
185.Fn EVP_read_pw_string
186first appeared in SSLeay 0.5.1 and
187.Fn EVP_set_pw_prompt
188and
189.Fn EVP_get_pw_prompt
190in SSLeay 0.6.0.
191These functions have been available since
192.Ox 2.4 .
193.Pp
194.Fn EVP_read_pw_string_min
195first appeared in OpenSSL 1.0.0
196and has been available since
197.Ox 4.9 .
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