int aes_gcm_128(int enc, unsigned char *key, unsigned char *iv, unsigned char* plaintext, uint32_t plaintext_len, unsigned char *ciphertext,  uint32_t* op_ciphertext_len, unsigned char* tag); 
uint32_t base64_encoding_wrapper(unsigned char* src, uint32_t length, unsigned char* dest);
uint32_t base64_decoding_wrapper(const char* src, uint32_t length, unsigned char* dest);