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/*
* Copyright 2020-2021 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/err.h>
#include <openssl/core_names.h>
#ifndef FIPS_MODULE
# include <openssl/x509.h>
#endif
#include "internal/param_build_set.h"
#include "crypto/dh.h"
#include "dh_local.h"
/*
* The intention with the "backend" source file is to offer backend functions
* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
* implementations alike.
*/
static int dh_ffc_params_fromdata(DH *dh, const OSSL_PARAM params[])
{
int ret;
FFC_PARAMS *ffc;
if (dh == NULL)
return 0;
ffc = ossl_dh_get0_params(dh);
if (ffc == NULL)
return 0;
ret = ossl_ffc_params_fromdata(ffc, params);
if (ret)
ossl_dh_cache_named_group(dh); /* This increments dh->dirty_cnt */
return ret;
}
int ossl_dh_params_fromdata(DH *dh, const OSSL_PARAM params[])
{
const OSSL_PARAM *param_priv_len;
long priv_len;
if (!dh_ffc_params_fromdata(dh, params))
return 0;
param_priv_len =
OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_PRIV_LEN);
if (param_priv_len != NULL
&& (!OSSL_PARAM_get_long(param_priv_len, &priv_len)
|| !DH_set_length(dh, priv_len)))
return 0;
return 1;
}
int ossl_dh_key_fromdata(DH *dh, const OSSL_PARAM params[])
{
const OSSL_PARAM *param_priv_key, *param_pub_key;
BIGNUM *priv_key = NULL, *pub_key = NULL;
if (dh == NULL)
return 0;
param_priv_key = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
param_pub_key = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
if ((param_priv_key != NULL
&& !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
|| (param_pub_key != NULL
&& !OSSL_PARAM_get_BN(param_pub_key, &pub_key)))
goto err;
if (!DH_set0_key(dh, pub_key, priv_key))
goto err;
return 1;
err:
BN_clear_free(priv_key);
BN_free(pub_key);
return 0;
}
int ossl_dh_params_todata(DH *dh, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
{
long l = DH_get_length(dh);
if (!ossl_ffc_params_todata(ossl_dh_get0_params(dh), bld, params))
return 0;
if (l > 0
&& !ossl_param_build_set_long(bld, params, OSSL_PKEY_PARAM_DH_PRIV_LEN, l))
return 0;
return 1;
}
int ossl_dh_key_todata(DH *dh, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
{
const BIGNUM *priv = NULL, *pub = NULL;
if (dh == NULL)
return 0;
DH_get0_key(dh, &pub, &priv);
if (priv != NULL
&& !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PRIV_KEY, priv))
return 0;
if (pub != NULL
&& !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PUB_KEY, pub))
return 0;
return 1;
}
int ossl_dh_is_foreign(const DH *dh)
{
#ifndef FIPS_MODULE
if (dh->engine != NULL || ossl_dh_get_method(dh) != DH_OpenSSL())
return 1;
#endif
return 0;
}
static ossl_inline int dh_bn_dup_check(BIGNUM **out, const BIGNUM *f)
{
if (f != NULL && (*out = BN_dup(f)) == NULL)
return 0;
return 1;
}
DH *ossl_dh_dup(const DH *dh, int selection)
{
DH *dupkey = NULL;
/* Do not try to duplicate foreign DH keys */
if (ossl_dh_is_foreign(dh))
return NULL;
if ((dupkey = ossl_dh_new_ex(dh->libctx)) == NULL)
return NULL;
dupkey->length = DH_get_length(dh);
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0
&& !ossl_ffc_params_copy(&dupkey->params, &dh->params))
goto err;
dupkey->flags = dh->flags;
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0
&& ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0
|| !dh_bn_dup_check(&dupkey->pub_key, dh->pub_key)))
goto err;
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
&& ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0
|| !dh_bn_dup_check(&dupkey->priv_key, dh->priv_key)))
goto err;
#ifndef FIPS_MODULE
if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_DH,
&dupkey->ex_data, &dh->ex_data))
goto err;
#endif
return dupkey;
err:
DH_free(dupkey);
return NULL;
}
#ifndef FIPS_MODULE
DH *ossl_dh_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
OSSL_LIB_CTX *libctx, const char *propq)
{
const unsigned char *p, *pm;
int pklen, pmlen;
int ptype;
const void *pval;
const ASN1_STRING *pstr;
const X509_ALGOR *palg;
BIGNUM *privkey_bn = NULL;
ASN1_INTEGER *privkey = NULL;
DH *dh = NULL;
if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8inf))
return 0;
X509_ALGOR_get0(NULL, &ptype, &pval, palg);
if (ptype != V_ASN1_SEQUENCE)
goto decerr;
if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
goto decerr;
pstr = pval;
pm = pstr->data;
pmlen = pstr->length;
switch (OBJ_obj2nid(palg->algorithm)) {
case NID_dhKeyAgreement:
dh = d2i_DHparams(NULL, &pm, pmlen);
break;
case NID_dhpublicnumber:
dh = d2i_DHxparams(NULL, &pm, pmlen);
break;
default:
goto decerr;
}
if (dh == NULL)
goto decerr;
/* We have parameters now set private key */
if ((privkey_bn = BN_secure_new()) == NULL
|| !ASN1_INTEGER_to_BN(privkey, privkey_bn)) {
ERR_raise(ERR_LIB_DH, DH_R_BN_ERROR);
BN_clear_free(privkey_bn);
goto dherr;
}
if (!DH_set0_key(dh, NULL, privkey_bn))
goto dherr;
/* Calculate public key, increments dirty_cnt */
if (!DH_generate_key(dh))
goto dherr;
goto done;
decerr:
ERR_raise(ERR_LIB_DH, EVP_R_DECODE_ERROR);
dherr:
DH_free(dh);
dh = NULL;
done:
ASN1_STRING_clear_free(privkey);
return dh;
}
#endif
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