自学教程：C++ BN_bn2dec函数代码示例

int serverAct1(Server * server) {    int bytes;    char buf[1024];    char * bufptr = buf;    char * tmpstr;    printf("/n==== Этап 1 ====/n/n");        server->k = BN_new();    server->m = BN_new();    bytes = BIO_read(server->conn, buf, 1024);    buf[bytes] = 0;    BN_dec2bn(&server->k, buf);    tmpstr = BN_bn2dec(server->k);    printf("k = %s/n", tmpstr);    OPENSSL_free(tmpstr);    BIO_puts(server->conn, "OK");    bytes = BIO_read(server->conn, buf, 1024);    buf[bytes] = 0;    BN_dec2bn(&server->m, buf);    tmpstr = BN_bn2dec(server->m);    printf("m = %s/n", tmpstr);    OPENSSL_free(tmpstr);    BIO_puts(server->conn, "OK");    return 0;}

/*--------------------------------------------------*/void compute_mod(Task * task){	BN_CTX *context;       	BIGNUM *r,*a,*p,*m;        if(task->p==NULL){	fprintf(stderr,"Wrong Exponent/n");	exit(0);        }	/*Just printing out the client send numbers*/ 	printf("Printing the Exponent/n");	        print_bignumber(task->p); 	printf("Printing the Prime/n");		print_bignumber(task->m);		 	context = BN_CTX_new();        r = BN_new();	a = BN_new();	p = BN_new();	m = BN_new();	BN_dec2bn(&a,"2");	BN_dec2bn(&p,task->p);	BN_dec2bn(&m,task->m);	BN_mod_exp(r,a,p,m,context); 	printf("Response ----/n");	strcpy(task->response,BN_bn2dec(r));	print_bignumber(task->response);		return;}

/* retrieve basic constraints ingredients */BOOL SSL_X509_getBC(X509 *cert, int *ca, int *pathlen){    X509_EXTENSION *ext;    BASIC_CONSTRAINTS *bc;    int idx;    BIGNUM *bn = NULL;    char *cp;        if ((idx = X509_get_ext_by_NID(cert, NID_basic_constraints, -1)) < 0)        return FALSE;    ext = X509_get_ext(cert, idx);    if (ext == NULL)        return FALSE;    if ((bc = (BASIC_CONSTRAINTS *)X509V3_EXT_d2i(ext)) == NULL)        return FALSE;    *ca = bc->ca;    *pathlen = -1 /* unlimited */;    if (bc->pathlen != NULL) {        if ((bn = ASN1_INTEGER_to_BN(bc->pathlen, NULL)) == NULL)            return FALSE;        if ((cp = BN_bn2dec(bn)) == NULL)            return FALSE;        *pathlen = atoi(cp);        OPENSSL_free(cp);        BN_free(bn);    }    BASIC_CONSTRAINTS_free(bc);    return TRUE;}

  /**   * Decode a two's complement varint (e.g. Java BigInteger) byte array into its   * numerical value   *   * @param byte_array Two's complement varint byte array   * @return Numerical value of the varint   */  static std::string decode_varint(const char *byte_array) {    std::string result;    // Assuming positive numbers only    //TODO: Add check for bit to return negative values    BIGNUM *value = BN_bin2bn(reinterpret_cast<unsigned const char *>(byte_array), static_cast<int>(strlen(byte_array)), NULL);    if (value) {      char* decimal = BN_bn2dec(value);      result = std::string(decimal);      OPENSSL_free(decimal);      //Normalize - strip leading zeros      for (unsigned int n = 0; n < result.size(); ++n) {        if (result.at(n) == '0') {          result.replace(n, 1, "");        } else {          break;        }      }      if (result.size() == 0) {        result = "0";      }    }    BN_free(value);    return result;  }

/* Convert ASN1_INTEGER to decimal string string */static inttls_parse_bigint(struct tls *ctx, const ASN1_INTEGER *asn1int, const char **dst_p){	long small;	BIGNUM *big;	char *tmp, buf[64];	*dst_p = NULL;	small = ASN1_INTEGER_get(asn1int);	if (small < 0) {		big = ASN1_INTEGER_to_BN(asn1int, NULL);		if (big) {			tmp = BN_bn2dec(big);			if (tmp)				*dst_p = strdup(tmp);			OPENSSL_free(tmp);		}		BN_free(big);	} else {		snprintf(buf, sizeof buf, "%lu", small);		*dst_p = strdup(buf);	}	if (*dst_p)		return 0;	tls_set_errorx(ctx, "cannot parse serial");	return -1;}

int main(int argc, char *argv[]){   BIGNUM *fat; // declara
C++ BN_bn2hex函数代码示例
C++ BN_bn2bin函数代码示例