void    EVP_EncodeInit(EVP_ENCODE_CTX *ctx);
void    EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx,unsigned char *out,
		int *outl,unsigned char *in,int inl);
void    EVP_EncodeFinal(EVP_ENCODE_CTX *ctx,unsigned char *out,int *outl);
int     EVP_EncodeBlock(unsigned char *t, unsigned char *f, int n);

void    EVP_DecodeInit(EVP_ENCODE_CTX *ctx);
int     EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx,unsigned char *out,int *outl,
		unsigned char *in, int inl);
int     EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned
		char *out, int *outl);
int     EVP_DecodeBlock(unsigned char *t, unsigned
		char *f, int n);