Bug fix

Thanks to github.com/Jkinglyf

crypto/ffx/ffx.h

@@ -72,8 +72,30 @@ int  FFX_decrypt(FFX_CTX *ctx, const char *in, size_t inlen,
 	const unsigned char *tweak, size_t tweaklen, char *out);
 int  FFX_compute_luhn(const char *in, size_t inlen);
 
-#ifdef __cplusplus
+
+/* BEGIN ERROR CODES */
+/*
+ * The following lines are auto generated by the script mkerr.pl. Any changes
+ * made after this point may be overwritten when the script is next run.
+ */
+void ERR_load_FFX_strings(void);
+
+/* Error codes for the FFX functions. */
+
+/* Function codes. */
+# define FFX_F_FFX_COMPUTE_LUHN                           100
+# define FFX_F_FFX_DECRYPT                                101
+# define FFX_F_FFX_ENCRYPT                                102
+# define FFX_F_FFX_INIT                                   103
+
+/* Reason codes. */
+# define FFX_R_INIT_KEY_FAILED                            100
+# define FFX_R_INVALID_DIGITS_FORMAT                      101
+# define FFX_R_INVALID_DIGITS_LENGTH                      102
+# define FFX_R_INVALID_DIGIT_STRING                       103
+# define FFX_R_INVALID_TWEAK_LENGTH                       104
+
+#ifdef  __cplusplus
 }
 #endif
 #endif
-