+int auth_check_password_v1(const char *username, const char *password) {
+ unsigned char epw[SCRYPT_OUTPUT_SIZE];
+ uint8_t esalt[SCRYPT_SALT_SIZE];
+ unsigned char givenpw[SCRYPT_OUTPUT_SIZE];
+ int r;
+
+ if (auth_get_password(username, (char *)epw) == 0)
+ return 0;
+
+ if (auth_get_salt(username, esalt) == 0)
+ return 0;
+
+ r = crypto_scrypt((const uint8_t *)password, strlen(password), esalt, SCRYPT_SALT_SIZE, SCRYPT_N, SCRYPT_r, SCRYPT_p, givenpw, SCRYPT_OUTPUT_SIZE);
+ if (r != 0) {
+ fprintf(stderr, "Failure in scrypt for %s\n", username);
+ return 0;
+ }
+
+ if (memcmp(givenpw, epw, SCRYPT_OUTPUT_SIZE) == 0)
+ return 1;
+ else
+ return 0;
+}
+
+int auth_check_password(const char *username, const char *password) {
+ int version = auth_get_password_version(username);
+
+ switch(version) {
+ case 0:
+ if (auth_check_password_v0(username, password)) {
+ /* Refresh to the newest version */
+ auth_set_password(username, password);
+ return 1;
+ } else {
+ return 0;
+ }
+ break;
+ case 1:
+ return auth_check_password_v1(username, password);
+ }
+ fprintf(stderr, "auth_check_password fell through. Bad password version?\n");
+ return 0;
+}
+