Added weak attribute to csp_crypto_(de/en)crypt
#include <csp/csp_id.h>
/** Implement these, if you use csp_if_tun */
-int csp_crypto_decrypt(uint8_t * ciphertext_in, uint8_t ciphertext_len, uint8_t * msg_out); // Returns -1 for failure, length if ok
-int csp_crypto_encrypt(uint8_t * msg_begin, uint8_t msg_len, uint8_t * ciphertext_out); // Returns length of encrypted data
+
+__attribute__((weak)) int csp_crypto_decrypt(uint8_t * ciphertext_in, uint8_t ciphertext_len, uint8_t * msg_out); // Returns -1 for failure, length if ok
+__attribute__((weak)) int csp_crypto_encrypt(uint8_t * msg_begin, uint8_t msg_len, uint8_t * ciphertext_out); // Returns length of encrypted data
static int csp_if_tun_tx(csp_iface_t * iface, uint16_t via, csp_packet_t * packet) {
