New device access backend.

[platform/upstream/cryptsetup.git] / lib / utils_crypt.c

diff --git a/lib/utils_crypt.c b/lib/utils_crypt.c
index 11937d3..c2111c7 100644 (file)
--- a/lib/utils_crypt.c
+++ b/lib/utils_crypt.c
@@ -23,6 +23,8 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include <ctype.h>
+#include <limits.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -58,6 +60,15 @@ int crypt_parse_name_and_mode(const char *s, char *cipher, int *key_nums,
                return 0;
        }
 
+       /* Short version for "empty" cipher */
+       if (!strcmp(s, "null")) {
+               strncpy(cipher, "cipher_null", MAX_CIPHER_LEN);
+               strncpy(cipher_mode, "ecb", 9);
+               if (key_nums)
+                       *key_nums = 0;
+               return 0;
+       }
+
        if (sscanf(s, "%" MAX_CIPHER_LEN_STR "[^-]", cipher) == 1) {
                strncpy(cipher_mode, "cbc-plain", 10);
                if (key_nums)
@@ -388,3 +399,91 @@ out_err:
                crypt_safe_free(pass);
        return r;
 }
+
+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;
+}
+
+/*
+ * Device size string parsing, suffixes:
+ * s|S - 512 bytes sectors
+ * k  |K  |m  |M  |g  |G  |t  |T   - 1024 base
+ * kiB|KiB|miB|MiB|giB|GiB|tiB|TiB - 1024 base
+ * kb |KB |mM |MB |gB |GB |tB |TB  - 1000 base
+ */
+int crypt_string_to_size(struct crypt_device *cd, const char *s, uint64_t *size)
+{
+       char *endp = NULL;
+       size_t len;
+       uint64_t mult_base, mult, tmp;
+
+       *size = strtoull(s, &endp, 10);
+       if (!isdigit(s[0]) ||
+           (errno == ERANGE && *size == ULLONG_MAX) ||
+           (errno != 0 && *size == 0))
+               return -EINVAL;
+
+       if (!endp || !*endp)
+               return 0;
+
+       len = strlen(endp);
+       /* Allow "B" and "iB" suffixes */
+       if (len > 3 ||
+          (len == 3 && (endp[1] != 'i' || endp[2] != 'B')) ||
+          (len == 2 && endp[1] != 'B'))
+               return -EINVAL;
+
+       if (len == 1 || len == 3)
+               mult_base = 1024;
+       else
+               mult_base = 1000;
+
+       mult = 1;
+       switch (endp[0]) {
+       case 's':
+       case 'S': mult = 512;
+               break;
+       case 't':
+       case 'T': mult *= mult_base;
+       case 'g':
+       case 'G': mult *= mult_base;
+       case 'm':
+       case 'M': mult *= mult_base;
+       case 'k':
+       case 'K': mult *= mult_base;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       tmp = *size * mult;
+       if ((tmp / *size) != mult) {
+               log_dbg("Device size overflow.");
+               return -EINVAL;
+       }
+
+       *size = tmp;
+       return 0;
+}