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#ifndef SSH_DH_H
#define SSH_DH_H
#include <openssl/bn.h>
#include <openssl/sha.h>
#include <openssl/evp.h>
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
!defined(LIBRESSL_VERSION_NUMBER)
#define ssh_md_ctx_new EVP_MD_CTX_new
#define ssh_md_ctx_free EVP_MD_CTX_free
#else
#define ssh_md_ctx_new EVP_MD_CTX_create
#define ssh_md_ctx_free EVP_MD_CTX_destroy
#endif
#ifdef __cplusplus
extern "C" {
#endif
typedef unsigned char* (*hash_t)(const unsigned char *, size_t, unsigned char *);
typedef struct
{
EVP_MD_CTX *mdctx;
const EVP_MD *md;
unsigned int hashlen;
} evp_md_t;
typedef struct ssh_diffie_hellman
{
const char *name;
union {
struct {
BIGNUM *g; // generator
BIGNUM *p; // prime
BIGNUM *bn_x; /* random number */
BN_CTX *ctx;
} dh;
unsigned char privkey[32];
} priv;
int e_len;
unsigned char *mpint_e; /* g^x mod p */
int secret_len;
unsigned char *secret;
evp_md_t digest;
} SSH_DH;
void ssh_dh_free(SSH_DH*);
void ssh_dh_hash(SSH_DH*, const unsigned char* data, unsigned char*, size_t len);
int ssh_dh_compute_secret(SSH_DH*, const unsigned char *, int);
typedef SSH_DH*(*NEW_DH)(void);
extern const char all_dh_list[];
NEW_DH search_dh(const char *s);
#ifdef __cplusplus
}
#endif
#endif
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