Add support for auth0

src/auth0/auth0_c_api.h

@@ -0,0 +1,21 @@
+#ifndef SIST2_AUTH0_C_API_H
+#define SIST2_AUTH0_C_API_H
+
+#include "stdlib.h"
+
+#ifdef __cplusplus
+#define EXTERNC extern "C"
+#else
+#define EXTERNC
+#endif
+
+#define AUTH0_OK (0)
+#define AUTH0_ERR_EXPIRED (1)
+#define AUTH0_ERR_SIG_FORMAT (2)
+#define AUTH0_ERR_DECODE (3)
+#define AUTH0_ERR_VERIFICATION (4)
+#define AUTH0_ERR_AUDIENCE (5)
+
+EXTERNC int auth0_verify_jwt(const char *secret, const char *token, const char* audience);
+
+#endif