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Commit | Line | Data |
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d9a17c07 | 1 | /* Encrypting Passwords |
2b778ceb | 2 | Copyright (C) 1991-2021 Free Software Foundation, Inc. |
d9a17c07 RM |
3 | |
4 | This program is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU General Public License | |
6 | as published by the Free Software Foundation; either version 2 | |
7 | of the License, or (at your option) any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
5a82c748 | 15 | along with this program; if not, see <https://www.gnu.org/licenses/>. |
d9a17c07 RM |
16 | */ |
17 | ||
63f791d3 | 18 | #include <stdio.h> |
63f791d3 GK |
19 | #include <unistd.h> |
20 | #include <crypt.h> | |
21 | ||
d9a17c07 | 22 | int |
63f791d3 GK |
23 | main(void) |
24 | { | |
841785ba ZW |
25 | unsigned char ubytes[16]; |
26 | char salt[20]; | |
27 | const char *const saltchars = | |
63f791d3 GK |
28 | "./0123456789ABCDEFGHIJKLMNOPQRST" |
29 | "UVWXYZabcdefghijklmnopqrstuvwxyz"; | |
841785ba | 30 | char *hash; |
63f791d3 | 31 | int i; |
d9a17c07 | 32 | |
841785ba ZW |
33 | /* Retrieve 16 unpredictable bytes from the operating system. */ |
34 | if (getentropy (ubytes, sizeof ubytes)) | |
35 | { | |
36 | perror ("getentropy"); | |
37 | return 1; | |
38 | } | |
39 | ||
40 | /* Use them to fill in the salt string. */ | |
41 | salt[0] = '$'; | |
42 | salt[1] = '5'; /* SHA-256 */ | |
43 | salt[2] = '$'; | |
44 | for (i = 0; i < 16; i++) | |
45 | salt[3+i] = saltchars[ubytes[i] & 0x3f]; | |
46 | salt[3+i] = '\0'; | |
47 | ||
48 | /* Read in the user's passphrase and hash it. */ | |
49 | hash = crypt (getpass ("Enter new passphrase: "), salt); | |
50 | if (!hash || hash[0] == '*') | |
51 | { | |
52 | perror ("crypt"); | |
53 | return 1; | |
54 | } | |
d9a17c07 | 55 | |
63f791d3 | 56 | /* Print the results. */ |
841785ba | 57 | puts (hash); |
63f791d3 GK |
58 | return 0; |
59 | } |