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NAME

     dh - Diffie-Hellman key agreement



SYNOPSIS
      #include <openssl/dh.h>

      DH *   DH_new(void);
      void   DH_free(DH *dh);

      int    DH_size(DH *dh);

      DH *   DH_generate_parameters(int prime_len, int generator,
                     void (*callback)(int, int, void *), void *cb_arg);
      int    DH_check(DH *dh, int *codes);

      int    DH_generate_key(DH *dh);
      int    DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);

      void DH_set_default_method(DH_METHOD *meth);
      DH_METHOD *DH_get_default_method(void);
      DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth);
      DH *DH_new_method(DH_METHOD *meth);
      DH_METHOD *DH_OpenSSL(void);

      int DH_get_ex_new_index(long argl, char *argp, int (*new_func)(),
                  int (*dup_func)(), void (*free_func)());
      int DH_set_ex_data(DH *d, int idx, char *arg);
      char *DH_get_ex_data(DH *d, int idx);

      DH *   d2i_DHparams(DH **a, unsigned char **pp, long length);
      int    i2d_DHparams(DH *a, unsigned char **pp);

      int    DHparams_print_fp(FILE *fp, DH *x);
      int    DHparams_print(BIO *bp, DH *x);




DESCRIPTION
     These functions implement the Diffie-Hellman key agreement
     protocol.  The generation of shared DH parameters is
     described in DH_generate_parameters(3); DH_generate_key(3)
     describes how to perform a key agreement.

     The DH structure consists of several BIGNUM components.



      struct
             {
             BIGNUM *p;              // prime number (shared)
             BIGNUM *g;              // generator of Z_p (shared)
             BIGNUM *priv_key;       // private DH value x
             BIGNUM *pub_key;        // public DH value g^x
             // ...
             };
      DH




SEE ALSO
     dhparam(1), bn(3), dsa(3), err(3), rand(3), rsa(3),
     DH_set_method(3), DH_new(3), DH_get_ex_new_index(3),
     DH_generate_parameters(3), DH_compute_key(3),
     d2i_DHparams(3), RSA_print(3)









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Created 1996-2024 by Maxim Chirkov

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