openssl/crypto/dh/dh_ameth.c
Dr. Stephen Henson d3cc91eee2 Enhance DH dup functions.
Make DHparams_dup work properly with X9.42 DH parameters.
2013-08-05 15:45:01 +01:00

638 lines
14 KiB
C

/* 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 "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include <openssl/dh.h>
#include <openssl/bn.h>
#include "asn1_locl.h"
extern const EVP_PKEY_ASN1_METHOD dhx_asn1_meth;
/* 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;
void *pval;
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)))
{
DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
goto err;
}
if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
{
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)))
{
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:
if (public_key)
ASN1_INTEGER_free(public_key);
if (dh)
DH_free(dh);
return 0;
}
static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
DH *dh;
void *pval = NULL;
int ptype;
unsigned char *penc = NULL;
int penclen;
ASN1_STRING *str;
ASN1_INTEGER *pub_key = NULL;
dh=pkey->pkey.dh;
str = ASN1_STRING_new();
str->length = i2d_dhp(pkey, dh, &str->data);
if (str->length <= 0)
{
DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
goto err;
}
pval = str;
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, pval, penc, penclen))
return 1;
err:
if (penc)
OPENSSL_free(penc);
if (pval)
ASN1_STRING_free(pval);
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, PKCS8_PRIV_KEY_INFO *p8)
{
const unsigned char *p, *pm;
int pklen, pmlen;
int ptype;
void *pval;
ASN1_STRING *pstr;
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_dhp(pkey, &pm, pmlen)))
goto decerr;
/* We have parameters now set private key */
if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
{
DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR);
goto dherr;
}
/* Calculate public key */
if (!DH_generate_key(dh))
goto dherr;
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
ASN1_INTEGER_free(privkey);
return 1;
decerr:
DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
dherr:
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)
{
DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
goto err;
}
params->length = i2d_dhp(pkey, pkey->pkey.dh, &params->data);
if (params->length <= 0)
{
DHerr(DH_F_DH_PRIV_ENCODE,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)
{
DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR);
goto err;
}
dplen = i2d_ASN1_INTEGER(prkey, &dp);
ASN1_INTEGER_free(prkey);
if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
V_ASN1_SEQUENCE, params, dp, dplen))
goto err;
return 1;
err:
if (dp != NULL)
OPENSSL_free(dp);
if (params != NULL)
ASN1_STRING_free(params);
if (prkey != NULL)
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_dhp(pkey, pder, derlen)))
{
DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
return 0;
}
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
return 1;
}
static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
return i2d_dhp(pkey, 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(x->q, &buf_len);
update_buflen(x->j, &buf_len);
update_buflen(x->counter, &buf_len);
update_buflen(pub_key, &buf_len);
update_buflen(priv_key, &buf_len);
if (ptype == 2)
ktype = "DH Private-Key";
else if (ptype == 1)
ktype = "DH Public-Key";
else
ktype = "DH Parameters";
m= OPENSSL_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->q && !ASN1_bn_print(bp,"subgroup order:",x->q,m,indent)) goto err;
if (x->j && !ASN1_bn_print(bp,"subgroup factor:",x->j,m,indent))
goto err;
if (x->seed)
{
int i;
BIO_indent(bp, indent, 128);
BIO_puts(bp, "seed:");
for (i=0; i < x->seedlen; i++)
{
if ((i%15) == 0)
{
if(BIO_puts(bp,"\n") <= 0
|| !BIO_indent(bp,indent+4,128))
goto err;
}
if (BIO_printf(bp,"%02x%s", x->seed[i],
((i+1) == x->seedlen)?"":":") <= 0)
goto err;
}
if (BIO_write(bp,"\n",1) <= 0) return(0);
}
if (x->counter && !ASN1_bn_print(bp,"counter:",x->counter,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:
DHerr(DH_F_DO_DH_PRINT,reason);
}
if (m != NULL) OPENSSL_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 if (a->ameth == &dhx_asn1_meth)
{
if (BN_cmp(a->pkey.dh->q,b->pkey.dh->q))
return 0;
}
return 1;
}
static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src)
{
BIGNUM *a;
if (src)
{
a = BN_dup(src);
if (!a)
return 0;
}
else
a = NULL;
if (*dst)
BN_free(*dst);
*dst = a;
return 1;
}
static int int_dh_param_copy(DH *to, const DH *from, int is_x942)
{
if (is_x942 == -1)
is_x942 = !!from->q;
if (!int_dh_bn_cpy(&to->p, from->p))
return 0;
if (!int_dh_bn_cpy(&to->g, from->g))
return 0;
if (is_x942)
{
if (!int_dh_bn_cpy(&to->q, from->q))
return 0;
if (!int_dh_bn_cpy(&to->j, from->j))
return 0;
if(to->seed)
{
OPENSSL_free(to->seed);
to->seed = NULL;
to->seedlen = 0;
}
if (from->seed)
{
to->seed = BUF_memdup(from->seed, from->seedlen);
if (!to->seed)
return 0;
to->seedlen = from->seedlen;
}
}
else
to->length = from->length;
return 1;
}
DH *DHparams_dup(DH *dh)
{
DH *ret;
ret = DH_new();
if (!ret)
return NULL;
if (!int_dh_param_copy(ret, dh, -1))
{
DH_free(ret);
return NULL;
}
return ret;
}
static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
{
return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
from->ameth == &dhx_asn1_meth);
}
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 =
{
EVP_PKEY_DH,
EVP_PKEY_DH,
0,
"DH",
"OpenSSL PKCS#3 DH method",
dh_pub_decode,
dh_pub_encode,
dh_pub_cmp,
dh_public_print,
dh_priv_decode,
dh_priv_encode,
dh_private_print,
int_dh_size,
dh_bits,
dh_param_decode,
dh_param_encode,
dh_missing_parameters,
dh_copy_parameters,
dh_cmp_parameters,
dh_param_print,
0,
int_dh_free,
0
};
const EVP_PKEY_ASN1_METHOD dhx_asn1_meth =
{
EVP_PKEY_DHX,
EVP_PKEY_DHX,
0,
"X9.42 DH",
"OpenSSL X9.42 DH method",
dh_pub_decode,
dh_pub_encode,
dh_pub_cmp,
dh_public_print,
dh_priv_decode,
dh_priv_encode,
dh_private_print,
int_dh_size,
dh_bits,
dh_param_decode,
dh_param_encode,
dh_missing_parameters,
dh_copy_parameters,
dh_cmp_parameters,
dh_param_print,
0,
int_dh_free,
0
};