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FILE *pkef;
                pkef=fopen("pke.txt", "a");
...
                                }
                                fprintf(pkef,"\n---------------------\
+n");
                        }

unsigned char *HMAC(const EVP_MD *evp_md, const void *key,
               int key_len, const unsigned char *d, int n,
               unsigned char *md, unsigned int *md_len);