+/*
+ * utils_crypt - cipher utilities for cryptsetup
+ *
+ * Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org>
+ * Copyright (C) 2009-2021 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2021 Milan Broz
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
#include <stdlib.h>
-#include <stddef.h>
#include <stdio.h>
#include <string.h>
+#include <ctype.h>
#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <termios.h>
#include "libcryptsetup.h"
-#include "nls.h"
#include "utils_crypt.h"
-struct safe_allocation {
- size_t size;
- char data[0];
-};
-
-int crypt_parse_name_and_mode(const char *s, char *cipher, char *cipher_mode)
+int crypt_parse_name_and_mode(const char *s, char *cipher, int *key_nums,
+ char *cipher_mode)
{
+ if (!s || !cipher || !cipher_mode)
+ return -EINVAL;
+
if (sscanf(s, "%" MAX_CIPHER_LEN_STR "[^-]-%" MAX_CIPHER_LEN_STR "s",
cipher, cipher_mode) == 2) {
+ if (!strcmp(cipher_mode, "plain"))
+ strcpy(cipher_mode, "cbc-plain");
+ if (key_nums) {
+ char *tmp = strchr(cipher, ':');
+ *key_nums = tmp ? atoi(++tmp) : 1;
+ if (!*key_nums)
+ return -EINVAL;
+ }
+
+ return 0;
+ }
+
+ /* Short version for "empty" cipher */
+ if (!strcmp(s, "null") || !strcmp(s, "cipher_null")) {
+ strcpy(cipher, "cipher_null");
+ strcpy(cipher_mode, "ecb");
+ if (key_nums)
+ *key_nums = 0;
return 0;
}
if (sscanf(s, "%" MAX_CIPHER_LEN_STR "[^-]", cipher) == 1) {
- strncpy(cipher_mode, "cbc-plain", 9);
+ strcpy(cipher_mode, "cbc-plain");
+ if (key_nums)
+ *key_nums = 1;
return 0;
}
return -EINVAL;
}
-/* safe allocations */
-void *crypt_safe_alloc(size_t size)
+int crypt_parse_hash_integrity_mode(const char *s, char *integrity)
{
- struct safe_allocation *alloc;
-
- if (!size)
- return NULL;
-
- alloc = malloc(size + offsetof(struct safe_allocation, data));
- if (!alloc)
- return NULL;
-
- alloc->size = size;
-
- return &alloc->data;
+ char mode[MAX_CIPHER_LEN], hash[MAX_CIPHER_LEN];
+ int r;
+
+ if (!s || !integrity || strchr(s, '(') || strchr(s, ')'))
+ return -EINVAL;
+
+ r = sscanf(s, "%" MAX_CIPHER_LEN_STR "[^-]-%" MAX_CIPHER_LEN_STR "s", mode, hash);
+ if (r == 2 && !isdigit(hash[0]))
+ r = snprintf(integrity, MAX_CIPHER_LEN, "%s(%s)", mode, hash);
+ else if (r == 2)
+ r = snprintf(integrity, MAX_CIPHER_LEN, "%s-%s", mode, hash);
+ else if (r == 1)
+ r = snprintf(integrity, MAX_CIPHER_LEN, "%s", mode);
+ else
+ return -EINVAL;
+
+ if (r < 0 || r >= MAX_CIPHER_LEN)
+ return -EINVAL;
+
+ return 0;
}
-void crypt_safe_free(void *data)
+int crypt_parse_integrity_mode(const char *s, char *integrity,
+ int *integrity_key_size)
{
- struct safe_allocation *alloc;
-
- if (!data)
- return;
-
- alloc = data - offsetof(struct safe_allocation, data);
-
- memset(data, 0, alloc->size);
-
- alloc->size = 0x55aa55aa;
- free(alloc);
+ int ks = 0, r = 0;
+
+ if (!s || !integrity)
+ return -EINVAL;
+
+ // FIXME: do not hardcode it here
+
+ /* AEAD modes */
+ if (!strcmp(s, "aead") ||
+ !strcmp(s, "poly1305") ||
+ !strcmp(s, "none")) {
+ strncpy(integrity, s, MAX_CIPHER_LEN);
+ ks = 0;
+ } else if (!strcmp(s, "hmac-sha1")) {
+ strncpy(integrity, "hmac(sha1)", MAX_CIPHER_LEN);
+ ks = 20;
+ } else if (!strcmp(s, "hmac-sha256")) {
+ strncpy(integrity, "hmac(sha256)", MAX_CIPHER_LEN);
+ ks = 32;
+ } else if (!strcmp(s, "hmac-sha512")) {
+ ks = 64;
+ strncpy(integrity, "hmac(sha512)", MAX_CIPHER_LEN);
+ } else if (!strcmp(s, "cmac-aes")) {
+ ks = 16;
+ strncpy(integrity, "cmac(aes)", MAX_CIPHER_LEN);
+ } else
+ r = -EINVAL;
+
+ if (integrity_key_size)
+ *integrity_key_size = ks;
+
+ return r;
}
-void *crypt_safe_realloc(void *data, size_t size)
+int crypt_parse_pbkdf(const char *s, const char **pbkdf)
{
- void *new_data;
+ const char *tmp = NULL;
- new_data = crypt_safe_alloc(size);
+ if (!s)
+ return -EINVAL;
- if (new_data && data) {
- struct safe_allocation *alloc;
+ if (!strcasecmp(s, CRYPT_KDF_PBKDF2))
+ tmp = CRYPT_KDF_PBKDF2;
+ else if (!strcasecmp(s, CRYPT_KDF_ARGON2I))
+ tmp = CRYPT_KDF_ARGON2I;
+ else if (!strcasecmp(s, CRYPT_KDF_ARGON2ID))
+ tmp = CRYPT_KDF_ARGON2ID;
- alloc = data - offsetof(struct safe_allocation, data);
+ if (!tmp)
+ return -EINVAL;
- if (size > alloc->size)
- size = alloc->size;
+ if (pbkdf)
+ *pbkdf = tmp;
- memcpy(new_data, data, size);
+ return 0;
+}
+
+ssize_t crypt_hex_to_bytes(const char *hex, char **result, int safe_alloc)
+{
+ char buf[3] = "xx\0", *endp, *bytes;
+ size_t i, len;
+
+ len = strlen(hex);
+ if (len % 2)
+ return -EINVAL;
+ len /= 2;
+
+ bytes = safe_alloc ? crypt_safe_alloc(len) : malloc(len);
+ if (!bytes)
+ return -ENOMEM;
+
+ for (i = 0; i < len; i++) {
+ memcpy(buf, &hex[i * 2], 2);
+ bytes[i] = strtoul(buf, &endp, 16);
+ if (endp != &buf[2]) {
+ safe_alloc ? crypt_safe_free(bytes) : free(bytes);
+ return -EINVAL;
+ }
}
+ *result = bytes;
+ return i;
+}
- crypt_safe_free(data);
- return new_data;
+bool crypt_is_cipher_null(const char *cipher_spec)
+{
+ if (!cipher_spec)
+ return false;
+ return (strstr(cipher_spec, "cipher_null") || !strcmp(cipher_spec, "null"));
}
projects / platform / upstream / cryptsetup.git / blobdiff