+/* Salt length matches digest */
+# define RSA_PSS_SALTLEN_DIGEST -1
+/* Verify only: auto detect salt length */
+# define RSA_PSS_SALTLEN_AUTO -2
+/* Set salt length to maximum possible */
+# define RSA_PSS_SALTLEN_MAX -3
+/* Old compatible max salt length for sign only */
+# define RSA_PSS_SALTLEN_MAX_SIGN -2