int MD2_Update(MD2_CTX *c, const unsigned char *data, size_t len);
int MD2_Final(unsigned char *md, MD2_CTX *c);
unsigned char *MD2(const unsigned char *d, size_t n, unsigned char *md);
int MD2_Update(MD2_CTX *c, const unsigned char *data, size_t len);
int MD2_Final(unsigned char *md, MD2_CTX *c);
unsigned char *MD2(const unsigned char *d, size_t n, unsigned char *md);