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 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 */ 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 