tomcrypt/mycrypt_misc.h

/* ---- BASE64 Routines ---- */
#ifdef BASE64
 int base64_encode(const unsigned char *in,  unsigned long len, 
                               unsigned char *out, unsigned long *outlen);

 int base64_decode(const unsigned char *in,  unsigned long len, 
                               unsigned char *out, unsigned long *outlen);
#endif

/* ---- MEM routines ---- */
 void zeromem(void *dst, size_t len);
 void burn_stack(unsigned long len);

 const char *error_to_string(int err);
 int mpi_to_ltc_error(int err);

 extern const char *crypt_build_settings;