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66 lines
1.7 KiB
Plaintext
66 lines
1.7 KiB
Plaintext
=pod
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=head1 NAME
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dh - Diffie-Hellman key agreement
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=head1 SYNOPSIS
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#include <openssl/dh.h>
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void DH_set_default_method(DH_METHOD *meth);
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DH_METHOD *DH_get_default_method(void);
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DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth);
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DH *DH_new_method(DH_METHOD *meth);
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DH_METHOD *DH_OpenSSL(void);
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DH * DH_new(void);
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void DH_free(DH *dh);
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int DH_size(DH *dh);
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int DH_get_ex_new_index(long argl, char *argp, int (*new_func)(),
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int (*dup_func)(), void (*free_func)());
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int DH_set_ex_data(DH *d, int idx, char *arg);
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char *DH_get_ex_data(DH *d, int idx);
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DH * DH_generate_parameters(int prime_len, int generator,
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void (*callback)(int, int, void *), void *cb_arg);
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int DH_check(DH *dh, int *codes);
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int DH_generate_key(DH *dh);
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int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
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DH * d2i_DHparams(DH **a, unsigned char **pp, long length);
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int i2d_DHparams(DH *a, unsigned char **pp);
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int DHparams_print_fp(FILE *fp, DH *x);
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int DHparams_print(BIO *bp, DH *x);
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=head1 DESCRIPTION
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These functions implement the Diffie-Hellman key agreement protocol.
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The generation of shared DH parameters is described in
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L<DH_generate_parameters(3)>; L<DH_generate_key(3)> describes how
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to perform a key agreement.
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The B<DH> structure consists of several BIGNUM components.
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struct
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{
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BIGNUM *p; // prime number (shared)
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BIGNUM *g; // generator of Z_p (shared)
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BIGNUM *priv_key; // private DH value x
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BIGNUM *pub_key; // public DH value g^x
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// ...
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};
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DH
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=head1 SEE ALSO
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dh(1), bn(3), dsa(3), err(3), rand(3), rsa(3), DH_set_method(3),
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DH_new(3), DH_get_ex_new_index(3), DH_generate_parameters(3),
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DH_compute_key(3), d2i_DHparams(3), DHparams_print(3)
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=cut
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