yuzu/externals/libressl/crypto/dh/dh_ameth.c

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2020-12-28 19:15:37 +04:00
/* $OpenBSD: dh_ameth.c,v 1.18 2020/01/04 13:57:43 inoguchi Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2006.
*/
/* ====================================================================
* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <openssl/asn1.h>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/err.h>
#include <openssl/x509.h>
#include "asn1_locl.h"
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) {
DHerror(DH_R_PARAMETER_ENCODING_ERROR);
goto err;
}
pstr = pval;
pm = pstr->data;
pmlen = pstr->length;
if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) {
DHerror(DH_R_DECODE_ERROR);
goto err;
}
if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) {
DHerror(DH_R_DECODE_ERROR);
goto err;
}
/* We have parameters now set public key */
if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) {
DHerror(DH_R_BN_DECODE_ERROR);
goto err;
}
ASN1_INTEGER_free(public_key);
EVP_PKEY_assign_DH(pkey, dh);
return 1;
err:
if (public_key)
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) {
DHerror(ERR_R_MALLOC_FAILURE);
goto err;
}
str->length = i2d_DHparams(dh, &str->data);
if (str->length <= 0) {
DHerror(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) {
DHerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH), ptype,
(void *)str, penc, penclen))
return 1;
err:
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 paramaters, the private key
* is explcitly 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 pklen, pmlen;
int ptype;
const void *pval;
const ASN1_STRING *pstr;
const X509_ALGOR *palg;
ASN1_INTEGER *privkey = NULL;
DH *dh = NULL;
if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
return 0;
X509_ALGOR_get0(NULL, &ptype, &pval, palg);
if (ptype != V_ASN1_SEQUENCE)
goto decerr;
if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
goto decerr;
pstr = pval;
pm = pstr->data;
pmlen = pstr->length;
if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
goto decerr;
/* We have parameters now set private key */
if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) {
DHerror(DH_R_BN_ERROR);
goto dherr;
}
/* Calculate public key */
if (!DH_generate_key(dh))
goto dherr;
EVP_PKEY_assign_DH(pkey, dh);
ASN1_INTEGER_free(privkey);
return 1;
decerr:
DHerror(EVP_R_DECODE_ERROR);
dherr:
ASN1_INTEGER_free(privkey);
DH_free(dh);
return 0;
}
static int
dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
{
ASN1_STRING *params = NULL;
ASN1_INTEGER *prkey = NULL;
unsigned char *dp = NULL;
int dplen;
params = ASN1_STRING_new();
if (!params) {
DHerror(ERR_R_MALLOC_FAILURE);
goto err;
}
params->length = i2d_DHparams(pkey->pkey.dh, &params->data);
if (params->length <= 0) {
DHerror(ERR_R_MALLOC_FAILURE);
goto err;
}
params->type = V_ASN1_SEQUENCE;
/* Get private key into integer */
prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
if (!prkey) {
DHerror(DH_R_BN_ERROR);
goto err;
}
dplen = i2d_ASN1_INTEGER(prkey, &dp);
ASN1_INTEGER_free(prkey);
prkey = NULL;
if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0,
V_ASN1_SEQUENCE, params, dp, dplen))
goto err;
return 1;
err:
free(dp);
ASN1_STRING_free(params);
ASN1_INTEGER_free(prkey);
return 0;
}
static void
update_buflen(const BIGNUM *b, size_t *pbuflen)
{
size_t i;
if (!b)
return;
if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
*pbuflen = i;
}
static int
dh_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
{
DH *dh;
if (!(dh = d2i_DHparams(NULL, pder, derlen))) {
DHerror(ERR_R_DH_LIB);
return 0;
}
EVP_PKEY_assign_DH(pkey, dh);
return 1;
}
static int
dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
return i2d_DHparams(pkey->pkey.dh, pder);
}
static int
do_dh_print(BIO *bp, const DH *x, int indent, ASN1_PCTX *ctx, int ptype)
{
unsigned char *m = NULL;
int reason = ERR_R_BUF_LIB, ret = 0;
size_t buf_len = 0;
const char *ktype = NULL;
BIGNUM *priv_key, *pub_key;
if (ptype == 2)
priv_key = x->priv_key;
else
priv_key = NULL;
if (ptype > 0)
pub_key = x->pub_key;
else
pub_key = NULL;
update_buflen(x->p, &buf_len);
if (buf_len == 0) {
reason = ERR_R_PASSED_NULL_PARAMETER;
goto err;
}
update_buflen(x->g, &buf_len);
update_buflen(pub_key, &buf_len);
update_buflen(priv_key, &buf_len);
if (ptype == 2)
ktype = "PKCS#3 DH Private-Key";
else if (ptype == 1)
ktype = "PKCS#3 DH Public-Key";
else
ktype = "PKCS#3 DH Parameters";
m= malloc(buf_len + 10);
if (m == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
BIO_indent(bp, indent, 128);
if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
goto err;
indent += 4;
if (!ASN1_bn_print(bp, "private-key:", priv_key, m, indent))
goto err;
if (!ASN1_bn_print(bp, "public-key:", pub_key, m, indent))
goto err;
if (!ASN1_bn_print(bp, "prime:", x->p, m, indent))
goto err;
if (!ASN1_bn_print(bp, "generator:", x->g, m, indent))
goto err;
if (x->length != 0) {
BIO_indent(bp, indent, 128);
if (BIO_printf(bp, "recommended-private-length: %d bits\n",
(int)x->length) <= 0)
goto err;
}
ret = 1;
if (0) {
err:
DHerror(reason);
}
free(m);
return(ret);
}
static int
int_dh_size(const EVP_PKEY *pkey)
{
return DH_size(pkey->pkey.dh);
}
static int
dh_bits(const EVP_PKEY *pkey)
{
return BN_num_bits(pkey->pkey.dh->p);
}
static int
dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
{
if (BN_cmp(a->pkey.dh->p, b->pkey.dh->p) ||
BN_cmp(a->pkey.dh->g, b->pkey.dh->g))
return 0;
else
return 1;
}
static int
dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
{
BIGNUM *a;
if ((a = BN_dup(from->pkey.dh->p)) == NULL)
return 0;
BN_free(to->pkey.dh->p);
to->pkey.dh->p = a;
if ((a = BN_dup(from->pkey.dh->g)) == NULL)
return 0;
BN_free(to->pkey.dh->g);
to->pkey.dh->g = a;
return 1;
}
static int
dh_missing_parameters(const EVP_PKEY *a)
{
if (!a->pkey.dh->p || !a->pkey.dh->g)
return 1;
return 0;
}
static int
dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
{
if (dh_cmp_parameters(a, b) == 0)
return 0;
if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
return 0;
else
return 1;
}
static int
dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
{
return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
}
static int
dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
{
return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
}
static int
dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
{
return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
}
int
DHparams_print(BIO *bp, const DH *x)
{
return do_dh_print(bp, x, 4, NULL, 0);
}
const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
.pkey_id = EVP_PKEY_DH,
.pkey_base_id = EVP_PKEY_DH,
.pem_str = "DH",
.info = "OpenSSL PKCS#3 DH method",
.pub_decode = dh_pub_decode,
.pub_encode = dh_pub_encode,
.pub_cmp = dh_pub_cmp,
.pub_print = dh_public_print,
.priv_decode = dh_priv_decode,
.priv_encode = dh_priv_encode,
.priv_print = dh_private_print,
.pkey_size = int_dh_size,
.pkey_bits = dh_bits,
.param_decode = dh_param_decode,
.param_encode = dh_param_encode,
.param_missing = dh_missing_parameters,
.param_copy = dh_copy_parameters,
.param_cmp = dh_cmp_parameters,
.param_print = dh_param_print,
.pkey_free = int_dh_free,
};