/*
* Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include "dh_locl.h"
#include <openssl/bn.h>
#include "internal/asn1_int.h"
#include "internal/evp_int.h"
#include <openssl/cms.h>
/*
* i2d/d2i like DH parameter functions which use the appropriate routine for
* PKCS#3 DH or X9.42 DH.
*/
static DH *d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp,
long length)
{
if (pkey->ameth == &dhx_asn1_meth)
return d2i_DHxparams(NULL, pp, length);
return d2i_DHparams(NULL, pp, length);
}
static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
{
if (pkey->ameth == &dhx_asn1_meth)
return i2d_DHxparams(a, pp);
return i2d_DHparams(a, pp);
}
static void int_dh_free(EVP_PKEY *pkey)
{
DH_free(pkey->pkey.dh);
}
static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
{
const unsigned char *p, *pm;
int pklen, pmlen;
int ptype;
const void *pval;
const ASN1_STRING *pstr;
X509_ALGOR *palg;
ASN1_INTEGER *public_key = NULL;
DH *dh = NULL;
if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
return 0;
X509_ALGOR_get0(NULL, &ptype, &pval, palg);
if (ptype != V_ASN1_SEQUENCE) {
DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
goto err;
}
pstr = pval;
pm = pstr->data;
pmlen = pstr->length;
if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) {
DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
goto err;
}
if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
goto err;
}
/* We have parameters now set public key */
if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
goto err;
}
ASN1_INTEGER_free(public_key);
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
return 1;
err:
ASN1_INTEGER_free(public_key);
DH_free(dh);
return 0;
}
static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
DH *dh;
int ptype;
unsigned char *penc = NULL;
int penclen;
ASN1_STRING *str;
ASN1_INTEGER *pub_key = NULL;
dh = pkey->pkey.dh;
str = ASN1_STRING_new();
if (str == NULL) {
DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
goto err;
}
str->length = i2d_dhp(pkey, dh, &str->data);
if (str->length <= 0) {
DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
goto err;
}
ptype = V_ASN1_SEQUENCE;
pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
if (!pub_key)
goto err;
penclen = i2d_ASN1_INTEGER(pub_key, &penc);
ASN1_INTEGER_free(pub_key);
if (penclen <= 0) {
DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
goto err;
}
if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
ptype, str, penc, penclen))
return 1;
err:
OPENSSL_free(penc);
ASN1_STRING_free(str);
return 0;
}
/*
* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
* the AlgorithmIdentifier contains the parameters, the private key is
* explicitly included and the pubkey must be recalculated.
*/
static int dh_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
{
const unsigned char *p, *pm;
int