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1 /*
2  * crypto_mode.c --- convert between encryption modes and strings
3  *
4  * Copyright (C) 1999  Theodore Ts'o <tytso@mit.edu>
5  *
6  * %Begin-Header%
7  * This file may be redistributed under the terms of the GNU Library
8  * General Public License, version 2.
9  * %End-Header%
10  */
11 
12 #include "config.h"
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <strings.h>
17 #include <ctype.h>
18 #include <errno.h>
19 
20 #include "e2p.h"
21 
22 struct mode {
23 	int		num;
24 	const char	*string;
25 };
26 
27 static struct mode mode_list[] = {
28 	{	EXT4_ENCRYPTION_MODE_INVALID,		"Invalid"},
29 	{	EXT4_ENCRYPTION_MODE_AES_256_XTS,	"AES-256-XTS"},
30 	{	EXT4_ENCRYPTION_MODE_AES_256_GCM,	"AES-256-GCM"},
31 	{	EXT4_ENCRYPTION_MODE_AES_256_CBC,	"AES-256-CBC"},
32 	{	0, 0 },
33 };
34 
e2p_encmode2string(int num)35 const char *e2p_encmode2string(int num)
36 {
37 	struct mode  *p;
38 	static char buf[20];
39 
40 	for (p = mode_list; p->string; p++) {
41 		if (num == p->num)
42 			return p->string;
43 	}
44 	sprintf(buf, "ENC_MODE_%d", num);
45 	return buf;
46 }
47 
48 /*
49  * Returns the hash algorithm, or -1 on error
50  */
e2p_string2encmode(char * string)51 int e2p_string2encmode(char *string)
52 {
53 	struct mode	*p;
54 	char		*eptr;
55 	int		num;
56 
57 	for (p = mode_list; p->string; p++) {
58 		if (!strcasecmp(string, p->string)) {
59 			return p->num;
60 		}
61 	}
62 	if (strncasecmp(string, "ENC_MODE_", 9))
63 		return -1;
64 
65 	if (string[9] == 0)
66 		return -1;
67 	num = strtol(string+9, &eptr, 10);
68 	if (num > 255 || num < 0)
69 		return -1;
70 	if (*eptr)
71 		return -1;
72 	return num;
73 }
74 
75