+static int chap_check_algorithm(const char *a_str)
+{
+ char *tmp, *orig, *token;
+
+ tmp = kstrdup(a_str, GFP_KERNEL);
+ if (!tmp) {
+ pr_err("Memory allocation failed for CHAP_A temporary buffer\n");
+ return CHAP_DIGEST_UNKNOWN;
+ }
+ orig = tmp;
+
+ token = strsep(&tmp, "=");
+ if (!token)
+ goto out;
+
+ if (strcmp(token, "CHAP_A")) {
+ pr_err("Unable to locate CHAP_A key\n");
+ goto out;
+ }
+ while (token) {
+ token = strsep(&tmp, ",");
+ if (!token)
+ goto out;
+
+ if (!strncmp(token, "5", 1)) {
+ pr_debug("Selected MD5 Algorithm\n");
+ kfree(orig);
+ return CHAP_DIGEST_MD5;
+ }
+ }
+out:
+ kfree(orig);
+ return CHAP_DIGEST_UNKNOWN;
+}