openssl/crypto/dh/dh_ameth.c
Dr. Stephen Henson fa1ba589f3 Add algorithm specific signature printing. An individual ASN1 method can
now print out signatures instead of the standard hex dump.

More complex signatures (e.g. PSS) can print out more meaningful information.

Sample DSA version included that prints out the signature parameters r, s.

[Note EVP_PKEY_ASN1_METHOD is an application opaque structure so adding
 new fields in the middle has no compatibility issues]
2010-03-06 18:05:05 +00:00

502 lines
11 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"
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_DHparams(NULL, &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_DH(pkey, 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_DHparams(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(EVP_PKEY_DH),
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_DHparams(NULL, &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_DH(pkey, 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_DHparams(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(NID_dhKeyAgreement), 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_DHparams(NULL, pder, derlen)))
{
DHerr(DH_F_DH_PARAM_DECODE, 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= 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->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
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;
if (to->pkey.dh->p != NULL)
BN_free(to->pkey.dh->p);
to->pkey.dh->p=a;
if ((a=BN_dup(from->pkey.dh->g)) == NULL)
return 0;
if (to->pkey.dh->g != NULL)
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 =
{
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
};