SecretSharer.h

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#ifndef SECRETSHARER_H_
#define SECRETSHARER_H_

#include <vector>
#include <string>
#include <sstream>
#include <istream>

#include "ByteArray.h"
#include "Random.h"

#include <libcryptosec/exception/RandomException.h>
#include <libcryptosec/exception/SecretSharerException.h>

class SecretSharer {
public:
    static void split(std::istream *data, int parts, int threshold, std::vector<std::ostream*> *secrets)
        throw (SecretSharerException, RandomException);
    
    static void join(std::vector<std::istream* > *secrets, unsigned int parts, unsigned int threshold, std::ostream *secret)
        throw (SecretSharerException);
private:

    static unsigned char * int2char(unsigned int value);
    static unsigned int char2int(unsigned char *data);
    static char * bin2hex(unsigned char *data, int ndata);
    static unsigned char * hex2bin(char *data, unsigned int *length);
    static void setHeader(std::vector<std::ostream *>* secrets);
    static unsigned int * getHeader(std::vector<std::istream *>* secrets);
    static unsigned int * order_parts(unsigned int *seq, unsigned int parts, unsigned int threshold);

    static void rand_bytes(unsigned char *data, int num) throw (RandomException);
    static unsigned int eval (unsigned int * poly, unsigned int n, unsigned int x, unsigned int mod)
            throw (SecretSharerException);
    static void split_poly (std::istream *data, int parts, int threshold, std::vector<std::ostream *>* secrets)
            throw (RandomException, SecretSharerException);
    static unsigned int get_limited_16 (std::istream *data, unsigned int limit, struct splitContext * ctx)
            throw (RandomException);
    static void split_out (unsigned int d, std::vector<std::ostream *>* secrets, int parts, int threshold)
            throw (RandomException, SecretSharerException);
    static void split_xor (std::istream *data, int parts, std::vector<std::ostream *>* secrets)
            throw (RandomException);
    
    static void ExtBinEuclid(unsigned int * u, unsigned int * v, unsigned int * u1, unsigned int * u2, unsigned int * u3);
    static unsigned int invert(unsigned int n, unsigned int modulus)
            throw (SecretSharerException);
    
    static unsigned int interp (unsigned int i, unsigned int x [], unsigned int y [], unsigned int n, unsigned int mod)
            throw (SecretSharerException);
    static unsigned int get_assemble_16(std::vector<std::istream *>* secrets, unsigned int i, struct assembleContext * ctx, unsigned int limit);
    static unsigned int get_assemble (std::vector<std::istream *>* secrets, unsigned int *seq, unsigned int threshold, unsigned int x [], struct assembleContext * ctx)
            throw (SecretSharerException);
    static void assemble_poly(std::vector<std::istream *>* secrets, unsigned int *seq, unsigned int threshold, std::ostream *secret)
            throw (SecretSharerException);
    static void assemble_xor(std::vector<std::istream *>* secrets, unsigned int parts, std::ostream *secret);
};
#endif /*SECRETSHARER_H_*/