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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* DH low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <openssl/crypto.h>
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/dh.h>
#include <openssl/params.h>
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "crypto/dh.h"
static OSSL_OP_keyexch_newctx_fn dh_newctx;
static OSSL_OP_keyexch_init_fn dh_init;
static OSSL_OP_keyexch_set_peer_fn dh_set_peer;
static OSSL_OP_keyexch_derive_fn dh_derive;
static OSSL_OP_keyexch_freectx_fn dh_freectx;
static OSSL_OP_keyexch_dupctx_fn dh_dupctx;
static OSSL_OP_keyexch_set_ctx_params_fn dh_set_ctx_params;
static OSSL_OP_keyexch_settable_ctx_params_fn dh_settable_ctx_params;
/*
* What's passed as an actual key is defined by the KEYMGMT interface.
* We happen to know that our KEYMGMT simply passes DH structures, so
* we use that here too.
*/
typedef struct {
OPENSSL_CTX *libctx;
DH *dh;
DH *dhpeer;
unsigned int pad : 1;
} PROV_DH_CTX;
static void *dh_newctx(void *provctx)
{
PROV_DH_CTX *pdhctx = OPENSSL_zalloc(sizeof(PROV_DH_CTX));
if (pdhctx == NULL)
return NULL;
pdhctx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
return pdhctx;
}
static int dh_init(void *vpdhctx, void *vdh)
{
PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
if (pdhctx == NULL || vdh == NULL || !DH_up_ref(vdh))
return 0;
DH_free(pdhctx->dh);
pdhctx->dh = vdh;
return 1;
}
static int dh_set_peer(void *vpdhctx, void *vdh)
{
PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
if (pdhctx == NULL || vdh == NULL || !DH_up_ref(vdh))
return 0;
DH_free(pdhctx->dhpeer);
pdhctx->dhpeer = vdh;
return 1;
}
static int dh_derive(void *vpdhctx, unsigned char *secret, size_t *secretlen,
size_t outlen)
{
PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
int ret;
size_t dhsize;
const BIGNUM *pub_key = NULL;
/* TODO(3.0): Add errors to stack */
if (pdhctx->dh == NULL || pdhctx->dhpeer == NULL)
return 0;
dhsize = (size_t)DH_size(pdhctx->dh);
if (secret == NULL) {
*secretlen = dhsize;
return 1;
}
if (outlen < dhsize)
return 0;
DH_get0_key(pdhctx->dhpeer, &pub_key, NULL);
if (pdhctx->pad)
ret = DH_compute_key_padded(secret, pub_key, pdhctx->dh);
else
ret = DH_compute_key(secret, pub_key, pdhctx->dh);
if (ret <= 0)
return 0;
*secretlen = ret;
return 1;
}
static void dh_freectx(void *vpdhctx)
{
PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
DH_free(pdhctx->dh);
DH_free(pdhctx->dhpeer);
OPENSSL_free(pdhctx);
}
static void *dh_dupctx(void *vpdhctx)
{
PROV_DH_CTX *srcctx = (PROV_DH_CTX *)vpdhctx;
PROV_DH_CTX *dstctx;
dstctx = OPENSSL_zalloc(sizeof(*srcctx));
if (dstctx == NULL)
return NULL;
*dstctx = *srcctx;
if (dstctx->dh != NULL && !DH_up_ref(dstctx->dh)) {
OPENSSL_free(dstctx);
return NULL;
}
if (dstctx->dhpeer != NULL && !DH_up_ref(dstctx->dhpeer)) {
DH_free(dstctx->dh);
OPENSSL_free(dstctx);
return NULL;
}
return dstctx;
}
static int dh_set_ctx_params(void *vpdhctx, const OSSL_PARAM params[])
{
PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
const OSSL_PARAM *p;
unsigned int pad;
if (pdhctx == NULL || params == NULL)
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_EXCHANGE_PARAM_PAD);
if (p == NULL || !OSSL_PARAM_get_uint(p, &pad))
return 0;
pdhctx->pad = pad ? 1 : 0;
return 1;
}
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_int(OSSL_EXCHANGE_PARAM_PAD, NULL),
OSSL_PARAM_END
};
static const OSSL_PARAM *dh_settable_ctx_params(void)
{
return known_settable_ctx_params;
}
const OSSL_DISPATCH dh_keyexch_functions[] = {
{ OSSL_FUNC_KEYEXCH_NEWCTX, (void (*)(void))dh_newctx },
{ OSSL_FUNC_KEYEXCH_INIT, (void (*)(void))dh_init },
{ OSSL_FUNC_KEYEXCH_DERIVE, (void (*)(void))dh_derive },
{ OSSL_FUNC_KEYEXCH_SET_PEER, (void (*)(void))dh_set_peer },
{ OSSL_FUNC_KEYEXCH_FREECTX, (void (*)(void))dh_freectx },
{ OSSL_FUNC_KEYEXCH_DUPCTX, (void (*)(void))dh_dupctx },
{ OSSL_FUNC_KEYEXCH_SET_CTX_PARAMS, (void (*)(void))dh_set_ctx_params },
{ OSSL_FUNC_KEYEXCH_SETTABLE_CTX_PARAMS,
(void (*)(void))dh_settable_ctx_params },
{ 0, NULL }
};
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