int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, unsigned char **ek,
int *ekl, unsigned char *iv,EVP_PKEY **pubk, int npubk);
-void EVP_SealFinal(EVP_CIPHER_CTX *ctx,unsigned char *out,int *outl);
+int EVP_SealFinal(EVP_CIPHER_CTX *ctx,unsigned char *out,int *outl);
void EVP_EncodeInit(EVP_ENCODE_CTX *ctx);
void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx,unsigned char *out,