Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/dsa/dsa_ameth.c	Lines:	169	265	63.8 %
Date:	2017-11-07	Branches:	74	160	46.3 %


/* $OpenBSD: dsa_ameth.c,v 1.23 2017/01/29 17:49:22 beck 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/opensslconf.h>

#include <openssl/asn1.h>
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/err.h>
#include <openssl/x509.h>

#include "asn1_locl.h"
#include "bn_lcl.h"

static int
dsa_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;

	DSA *dsa = 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) {
		pstr = pval;
		pm = pstr->data;
		pmlen = pstr->length;

		if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen))) {
			DSAerror(DSA_R_DECODE_ERROR);
			goto err;
		}
	} else if (ptype == V_ASN1_NULL || ptype == V_ASN1_UNDEF) {
		if (!(dsa = DSA_new())) {
			DSAerror(ERR_R_MALLOC_FAILURE);
			goto err;
			}
	} else {
		DSAerror(DSA_R_PARAMETER_ENCODING_ERROR);
		goto err;
	}

	if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) {
		DSAerror(DSA_R_DECODE_ERROR);
		goto err;
	}

	if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) {
		DSAerror(DSA_R_BN_DECODE_ERROR);
		goto err;
	}

	ASN1_INTEGER_free(public_key);
	EVP_PKEY_assign_DSA(pkey, dsa);
	return 1;

err:
	if (public_key)
		ASN1_INTEGER_free(public_key);
	DSA_free(dsa);
	return 0;
}

static int
dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
	DSA *dsa;
	void *pval = NULL;
	int ptype;
	unsigned char *penc = NULL;
	int penclen;

	dsa = pkey->pkey.dsa;
	if (pkey->save_parameters && dsa->p && dsa->q && dsa->g) {
		ASN1_STRING *str;

		str = ASN1_STRING_new();
		if (str == NULL) {
			DSAerror(ERR_R_MALLOC_FAILURE);
			goto err;
		}
		str->length = i2d_DSAparams(dsa, &str->data);
		if (str->length <= 0) {
			DSAerror(ERR_R_MALLOC_FAILURE);
			ASN1_STRING_free(str);
			goto err;
		}
		pval = str;
		ptype = V_ASN1_SEQUENCE;
	} else
		ptype = V_ASN1_UNDEF;

	dsa->write_params = 0;

	penclen = i2d_DSAPublicKey(dsa, &penc);

	if (penclen <= 0) {
		DSAerror(ERR_R_MALLOC_FAILURE);
		goto err;
	}

	if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA), ptype, pval,
	    penc, penclen))
		return 1;

err:
	free(penc);
	ASN1_STRING_free(pval);

	return 0;
}

/* In PKCS#8 DSA: you just get a private key integer and parameters in the
 * AlgorithmIdentifier the pubkey must be recalculated.
 */
static int
dsa_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;
	BN_CTX *ctx = NULL;
	DSA *dsa = NULL;

	int ret = 0;

	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)) == NULL)
		goto decerr;
	if (privkey->type == V_ASN1_NEG_INTEGER)
		goto decerr;

	pstr = pval;
	pm = pstr->data;
	pmlen = pstr->length;
	if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
		goto decerr;
	/* We have parameters now set private key */
	if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) {
		DSAerror(DSA_R_BN_ERROR);
		goto dsaerr;
	}
	/* Calculate public key */
	if (!(dsa->pub_key = BN_new())) {
		DSAerror(ERR_R_MALLOC_FAILURE);
		goto dsaerr;
	}
	if (!(ctx = BN_CTX_new())) {
		DSAerror(ERR_R_MALLOC_FAILURE);
		goto dsaerr;
	}

	if (!BN_mod_exp_ct(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx)) {
		DSAerror(DSA_R_BN_ERROR);
		goto dsaerr;
	}

	if (!EVP_PKEY_assign_DSA(pkey, dsa))
		goto decerr;

	ret = 1;
	goto done;

decerr:
	DSAerror(DSA_R_DECODE_ERROR);
dsaerr:
	DSA_free(dsa);
done:
	BN_CTX_free(ctx);
	ASN1_INTEGER_free(privkey);
	return ret;
}

static int
dsa_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) {
		DSAerror(ERR_R_MALLOC_FAILURE);
		goto err;
	}

	params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
	if (params->length <= 0) {
		DSAerror(ERR_R_MALLOC_FAILURE);
		goto err;
	}
	params->type = V_ASN1_SEQUENCE;

	/* Get private key into integer */
	prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
	if (!prkey) {
		DSAerror(DSA_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_dsa), 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 int
int_dsa_size(const EVP_PKEY *pkey)
{
	return DSA_size(pkey->pkey.dsa);
}

static int
dsa_bits(const EVP_PKEY *pkey)
{
	return BN_num_bits(pkey->pkey.dsa->p);
}

static int
dsa_missing_parameters(const EVP_PKEY *pkey)
{
	DSA *dsa;

	dsa = pkey->pkey.dsa;
	if (dsa->p == NULL || dsa->q == NULL || dsa->g == NULL)
		return 1;
	return 0;
}

static int
dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
{
	BIGNUM *a;

	if ((a = BN_dup(from->pkey.dsa->p)) == NULL)
		return 0;
	BN_free(to->pkey.dsa->p);
	to->pkey.dsa->p = a;

	if ((a = BN_dup(from->pkey.dsa->q)) == NULL)
		return 0;
	BN_free(to->pkey.dsa->q);
	to->pkey.dsa->q = a;

	if ((a = BN_dup(from->pkey.dsa->g)) == NULL)
		return 0;
	BN_free(to->pkey.dsa->g);
	to->pkey.dsa->g = a;
	return 1;
}

static int
dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
{
	if (BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) ||
	    BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) ||
	    BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g))
		return 0;
	else
		return 1;
}

static int
dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
{
	if (BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) != 0)
		return 0;
	else
		return 1;
}

static void
int_dsa_free(EVP_PKEY *pkey)
{
	DSA_free(pkey->pkey.dsa);
}

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
do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
{
	unsigned char *m = NULL;
	int ret = 0;
	size_t buf_len = 0;
	const char *ktype = NULL;
	const 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;

	if (ptype == 2)
		ktype = "Private-Key";
	else if (ptype == 1)
		ktype = "Public-Key";
	else
		ktype = "DSA-Parameters";

	update_buflen(x->p, &buf_len);
	update_buflen(x->q, &buf_len);
	update_buflen(x->g, &buf_len);
	update_buflen(priv_key, &buf_len);
	update_buflen(pub_key, &buf_len);

	m = malloc(buf_len + 10);
	if (m == NULL) {
		DSAerror(ERR_R_MALLOC_FAILURE);
		goto err;
	}

	if (priv_key) {
		if (!BIO_indent(bp, off, 128))
			goto err;
		if (BIO_printf(bp, "%s: (%d bit)\n", ktype,
		    BN_num_bits(x->p)) <= 0)
			goto err;
	}

	if (!ASN1_bn_print(bp, "priv:", priv_key, m, off))
		goto err;
	if (!ASN1_bn_print(bp, "pub: ", pub_key, m, off))
		goto err;
	if (!ASN1_bn_print(bp, "P:   ", x->p, m, off))
		goto err;
	if (!ASN1_bn_print(bp, "Q:   ", x->q, m, off))
		goto err;
	if (!ASN1_bn_print(bp, "G:   ", x->g, m, off))
		goto err;
	ret = 1;
err:
	free(m);
	return(ret);
}

static int
dsa_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
{
	DSA *dsa;

	if (!(dsa = d2i_DSAparams(NULL, pder, derlen))) {
		DSAerror(ERR_R_DSA_LIB);
		return 0;
	}
	EVP_PKEY_assign_DSA(pkey, dsa);
	return 1;
}

static int
dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
	return i2d_DSAparams(pkey->pkey.dsa, pder);
}

static int
dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
{
	return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
}

static int
dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
{
	return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
}

static int
dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
{
	return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
}

static int
old_dsa_priv_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
{
	DSA *dsa;
	BN_CTX *ctx = NULL;
	BIGNUM *j, *p1, *newp1;

	if (!(dsa = d2i_DSAPrivateKey(NULL, pder, derlen))) {
		DSAerror(ERR_R_DSA_LIB);
		return 0;
	}

	ctx = BN_CTX_new();
	if (ctx == NULL)
		goto err;

	/*
	 * Check that p and q are consistent with each other.
	 */

	j = BN_CTX_get(ctx);
	p1 = BN_CTX_get(ctx);
	newp1 = BN_CTX_get(ctx);
	if (j == NULL || p1 == NULL || newp1 == NULL)
		goto err;
	/* p1 = p - 1 */
	if (BN_sub(p1, dsa->p, BN_value_one()) == 0)
		goto err;
	/* j = (p - 1) / q */
	if (BN_div_ct(j, NULL, p1, dsa->q, ctx) == 0)
		goto err;
	/* q * j should == p - 1 */
	if (BN_mul(newp1, dsa->q, j, ctx) == 0)
		goto err;
	if (BN_cmp(newp1, p1) != 0) {
		DSAerror(DSA_R_BAD_Q_VALUE);
		goto err;
	}

	/*
	 * Check that q is not a composite number.
	 */

	if (BN_is_prime_ex(dsa->q, BN_prime_checks, ctx, NULL) == 0) {
		DSAerror(DSA_R_BAD_Q_VALUE);
		goto err;
	}

	BN_CTX_free(ctx);

	EVP_PKEY_assign_DSA(pkey, dsa);
	return 1;

err:
	BN_CTX_free(ctx);
	DSA_free(dsa);
	return 0;
}

static int
old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
	return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
}

static int
dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg, const ASN1_STRING *sig,
    int indent, ASN1_PCTX *pctx)
{
	DSA_SIG *dsa_sig;
	const unsigned char *p;

	if (!sig) {
		if (BIO_puts(bp, "\n") <= 0)
			return 0;
		else
			return 1;
	}
	p = sig->data;
	dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length);
	if (dsa_sig) {
		int rv = 0;
		size_t buf_len = 0;
		unsigned char *m = NULL;

		update_buflen(dsa_sig->r, &buf_len);
		update_buflen(dsa_sig->s, &buf_len);
		m = malloc(buf_len + 10);
		if (m == NULL) {
			DSAerror(ERR_R_MALLOC_FAILURE);
			goto err;
		}

		if (BIO_write(bp, "\n", 1) != 1)
			goto err;

		if (!ASN1_bn_print(bp, "r:   ", dsa_sig->r, m, indent))
			goto err;
		if (!ASN1_bn_print(bp, "s:   ", dsa_sig->s, m, indent))
			goto err;
		rv = 1;
err:
		free(m);
		DSA_SIG_free(dsa_sig);
		return rv;
	}
	return X509_signature_dump(bp, sig, indent);
}

static int
dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
	switch (op) {
	case ASN1_PKEY_CTRL_PKCS7_SIGN:
		if (arg1 == 0) {
			int snid, hnid;
			X509_ALGOR *alg1, *alg2;

			PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
			if (alg1 == NULL || alg1->algorithm == NULL)
				return -1;
			hnid = OBJ_obj2nid(alg1->algorithm);
			if (hnid == NID_undef)
				return -1;
			if (!OBJ_find_sigid_by_algs(&snid, hnid,
			    EVP_PKEY_id(pkey)))
				return -1;
			X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF,
			    0);
		}
		return 1;

	case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
		*(int *)arg2 = NID_sha1;
		return 2;

	default:
		return -2;
	}
}

/* NB these are sorted in pkey_id order, lowest first */

const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] = {
	{
		.pkey_id = EVP_PKEY_DSA2,
		.pkey_base_id = EVP_PKEY_DSA,
		.pkey_flags = ASN1_PKEY_ALIAS
	},

	{
		.pkey_id = EVP_PKEY_DSA1,
		.pkey_base_id = EVP_PKEY_DSA,
		.pkey_flags = ASN1_PKEY_ALIAS
	},

	{
		.pkey_id = EVP_PKEY_DSA4,
		.pkey_base_id = EVP_PKEY_DSA,
		.pkey_flags = ASN1_PKEY_ALIAS
	},

	{
		.pkey_id = EVP_PKEY_DSA3,
		.pkey_base_id = EVP_PKEY_DSA,
		.pkey_flags = ASN1_PKEY_ALIAS
	},

	{
		.pkey_id = EVP_PKEY_DSA,
		.pkey_base_id = EVP_PKEY_DSA,

		.pem_str = "DSA",
		.info = "OpenSSL DSA method",

		.pub_decode = dsa_pub_decode,
		.pub_encode = dsa_pub_encode,
		.pub_cmp = dsa_pub_cmp,
		.pub_print = dsa_pub_print,

		.priv_decode = dsa_priv_decode,
		.priv_encode = dsa_priv_encode,
		.priv_print = dsa_priv_print,

		.pkey_size = int_dsa_size,
		.pkey_bits = dsa_bits,

		.param_decode = dsa_param_decode,
		.param_encode = dsa_param_encode,
		.param_missing = dsa_missing_parameters,
		.param_copy = dsa_copy_parameters,
		.param_cmp = dsa_cmp_parameters,
		.param_print = dsa_param_print,
		.sig_print = dsa_sig_print,

		.pkey_free = int_dsa_free,
		.pkey_ctrl = dsa_pkey_ctrl,
		.old_priv_decode = old_dsa_priv_decode,
		.old_priv_encode = old_dsa_priv_encode
	}
};


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: dsa_ameth.c,v 1.23 2017/01/29 17:49:22 beck Exp $ */
2			/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3			* project 2006.
4			*/
5			/* ====================================================================
6			* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			*
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			*
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in
17			* the documentation and/or other materials provided with the
18			* distribution.
19			*
20			* 3. All advertising materials mentioning features or use of this
21			* software must display the following acknowledgment:
22			* "This product includes software developed by the OpenSSL Project
23			* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24			*
25			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26			* endorse or promote products derived from this software without
27			* prior written permission. For written permission, please contact
28			* licensing@OpenSSL.org.
29			*
30			* 5. Products derived from this software may not be called "OpenSSL"
31			* nor may "OpenSSL" appear in their names without prior written
32			* permission of the OpenSSL Project.
33			*
34			* 6. Redistributions of any form whatsoever must retain the following
35			* acknowledgment:
36			* "This product includes software developed by the OpenSSL Project
37			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38			*
39			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50			* OF THE POSSIBILITY OF SUCH DAMAGE.
51			* ====================================================================
52			*
53			* This product includes cryptographic software written by Eric Young
54			* (eay@cryptsoft.com). This product includes software written by Tim
55			* Hudson (tjh@cryptsoft.com).
56			*
57			*/
58
59			#include <stdio.h>
60
61			#include <openssl/opensslconf.h>
62
63			#include <openssl/asn1.h>
64			#include <openssl/bn.h>
65			#include <openssl/dsa.h>
66			#include <openssl/err.h>
67			#include <openssl/x509.h>
68
69			#include "asn1_locl.h"
70			#include "bn_lcl.h"
71
72			static int
73			dsa_pub_decode(EVP_PKEY pkey, X509_PUBKEY pubkey)
74			{
75		8	const unsigned char p, pm;
76		4	int pklen, pmlen;
77		4	int ptype;
78		4	void *pval;
79			ASN1_STRING *pstr;
80		4	X509_ALGOR *palg;
81			ASN1_INTEGER *public_key = NULL;
82
83			DSA *dsa = NULL;
84
85	✗✓	4	if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
86			return 0;
87		4	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
88
89	✓✗	4	if (ptype == V_ASN1_SEQUENCE) {
90		4	pstr = pval;
91		4	pm = pstr->data;
92		4	pmlen = pstr->length;
93
94	✗✓	4	if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen))) {
95			DSAerror(DSA_R_DECODE_ERROR);
96			goto err;
97			}
98			} else if (ptype == V_ASN1_NULL \|\| ptype == V_ASN1_UNDEF) {
99			if (!(dsa = DSA_new())) {
100			DSAerror(ERR_R_MALLOC_FAILURE);
101			goto err;
102			}
103			} else {
104			DSAerror(DSA_R_PARAMETER_ENCODING_ERROR);
105			goto err;
106			}
107
108	✗✓	4	if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) {
109			DSAerror(DSA_R_DECODE_ERROR);
110			goto err;
111			}
112
113	✗✓	4	if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) {
114			DSAerror(DSA_R_BN_DECODE_ERROR);
115			goto err;
116			}
117
118		4	ASN1_INTEGER_free(public_key);
119		4	EVP_PKEY_assign_DSA(pkey, dsa);
120		4	return 1;
121
122			err:
123			if (public_key)
124			ASN1_INTEGER_free(public_key);
125			DSA_free(dsa);
126			return 0;
127		4	}
128
129			static int
130			dsa_pub_encode(X509_PUBKEY pk, const EVP_PKEY pkey)
131			{
132			DSA *dsa;
133			void *pval = NULL;
134			int ptype;
135		8	unsigned char *penc = NULL;
136			int penclen;
137
138		4	dsa = pkey->pkey.dsa;
139	✓✗✓✗ ✓✗✓✗	16	if (pkey->save_parameters && dsa->p && dsa->q && dsa->g) {
140			ASN1_STRING *str;
141
142		4	str = ASN1_STRING_new();
143	✗✓	4	if (str == NULL) {
144			DSAerror(ERR_R_MALLOC_FAILURE);
145			goto err;
146			}
147		4	str->length = i2d_DSAparams(dsa, &str->data);
148	✗✓	4	if (str->length <= 0) {
149			DSAerror(ERR_R_MALLOC_FAILURE);
150			ASN1_STRING_free(str);
151			goto err;
152			}
153		4	pval = str;
154			ptype = V_ASN1_SEQUENCE;
155	✓✗✓	4	} else
156			ptype = V_ASN1_UNDEF;
157
158		4	dsa->write_params = 0;
159
160		4	penclen = i2d_DSAPublicKey(dsa, &penc);
161
162	✗✓	4	if (penclen <= 0) {
163			DSAerror(ERR_R_MALLOC_FAILURE);
164			goto err;
165			}
166
167	✓✗	8	if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA), ptype, pval,
168		4	penc, penclen))
169		4	return 1;
170
171			err:
172			free(penc);
173			ASN1_STRING_free(pval);
174
175			return 0;
176		4	}
177
178			/* In PKCS#8 DSA: you just get a private key integer and parameters in the
179			* AlgorithmIdentifier the pubkey must be recalculated.
180			*/
181			static int
182			dsa_priv_decode(EVP_PKEY pkey, PKCS8_PRIV_KEY_INFO p8)
183			{
184		4	const unsigned char p, pm;
185		2	int pklen, pmlen;
186		2	int ptype;
187		2	void *pval;
188			ASN1_STRING *pstr;
189		2	X509_ALGOR *palg;
190			ASN1_INTEGER *privkey = NULL;
191			BN_CTX *ctx = NULL;
192			DSA *dsa = NULL;
193
194			int ret = 0;
195
196	✗✓	2	if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
197			return 0;
198		2	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
199	✓✗	2	if (ptype != V_ASN1_SEQUENCE)
200			goto decerr;
201
202	✓✗	2	if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
203			goto decerr;
204	✓✗	2	if (privkey->type == V_ASN1_NEG_INTEGER)
205			goto decerr;
206
207		2	pstr = pval;
208		2	pm = pstr->data;
209		2	pmlen = pstr->length;
210	✓✗	2	if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
211			goto decerr;
212			/* We have parameters now set private key */
213	✗✓	2	if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) {
214			DSAerror(DSA_R_BN_ERROR);
215			goto dsaerr;
216			}
217			/* Calculate public key */
218	✗✓	2	if (!(dsa->pub_key = BN_new())) {
219			DSAerror(ERR_R_MALLOC_FAILURE);
220			goto dsaerr;
221			}
222	✗✓	2	if (!(ctx = BN_CTX_new())) {
223			DSAerror(ERR_R_MALLOC_FAILURE);
224			goto dsaerr;
225			}
226
227	✗✓	2	if (!BN_mod_exp_ct(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx)) {
228			DSAerror(DSA_R_BN_ERROR);
229			goto dsaerr;
230			}
231
232	✓✗	2	if (!EVP_PKEY_assign_DSA(pkey, dsa))
233			goto decerr;
234
235			ret = 1;
236		2	goto done;
237
238			decerr:
239			DSAerror(DSA_R_DECODE_ERROR);
240			dsaerr:
241			DSA_free(dsa);
242			done:
243		2	BN_CTX_free(ctx);
244		2	ASN1_INTEGER_free(privkey);
245		2	return ret;
246		2	}
247
248			static int
249			dsa_priv_encode(PKCS8_PRIV_KEY_INFO p8, const EVP_PKEY pkey)
250			{
251			ASN1_STRING *params = NULL;
252			ASN1_INTEGER *prkey = NULL;
253		12	unsigned char *dp = NULL;
254			int dplen;
255
256		6	params = ASN1_STRING_new();
257	✗✓	6	if (!params) {
258			DSAerror(ERR_R_MALLOC_FAILURE);
259			goto err;
260			}
261
262		6	params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
263	✗✓	6	if (params->length <= 0) {
264			DSAerror(ERR_R_MALLOC_FAILURE);
265			goto err;
266			}
267		6	params->type = V_ASN1_SEQUENCE;
268
269			/* Get private key into integer */
270		6	prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
271	✗✓	6	if (!prkey) {
272			DSAerror(DSA_R_BN_ERROR);
273			goto err;
274			}
275
276		6	dplen = i2d_ASN1_INTEGER(prkey, &dp);
277
278		6	ASN1_INTEGER_free(prkey);
279			prkey = NULL;
280
281	✓✗	12	if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0, V_ASN1_SEQUENCE,
282		6	params, dp, dplen))
283			goto err;
284
285		6	return 1;
286
287			err:
288			free(dp);
289			ASN1_STRING_free(params);
290			ASN1_INTEGER_free(prkey);
291			return 0;
292		6	}
293
294			static int
295			int_dsa_size(const EVP_PKEY *pkey)
296			{
297		8	return DSA_size(pkey->pkey.dsa);
298			}
299
300			static int
301			dsa_bits(const EVP_PKEY *pkey)
302			{
303		4	return BN_num_bits(pkey->pkey.dsa->p);
304			}
305
306			static int
307			dsa_missing_parameters(const EVP_PKEY *pkey)
308			{
309			DSA *dsa;
310
311		8	dsa = pkey->pkey.dsa;
312	✓✗✓✗ ✗✓	12	if (dsa->p == NULL \|\| dsa->q == NULL \|\| dsa->g == NULL)
313			return 1;
314		4	return 0;
315		4	}
316
317			static int
318			dsa_copy_parameters(EVP_PKEY to, const EVP_PKEY from)
319			{
320			BIGNUM *a;
321
322	✗✓	8	if ((a = BN_dup(from->pkey.dsa->p)) == NULL)
323			return 0;
324		4	BN_free(to->pkey.dsa->p);
325		4	to->pkey.dsa->p = a;
326
327	✗✓	4	if ((a = BN_dup(from->pkey.dsa->q)) == NULL)
328			return 0;
329		4	BN_free(to->pkey.dsa->q);
330		4	to->pkey.dsa->q = a;
331
332	✗✓	4	if ((a = BN_dup(from->pkey.dsa->g)) == NULL)
333			return 0;
334		4	BN_free(to->pkey.dsa->g);
335		4	to->pkey.dsa->g = a;
336		4	return 1;
337		4	}
338
339			static int
340			dsa_cmp_parameters(const EVP_PKEY a, const EVP_PKEY b)
341			{
342			if (BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) \|\|
343			BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) \|\|
344			BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g))
345			return 0;
346			else
347			return 1;
348			}
349
350			static int
351			dsa_pub_cmp(const EVP_PKEY a, const EVP_PKEY b)
352			{
353			if (BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) != 0)
354			return 0;
355			else
356			return 1;
357			}
358
359			static void
360			int_dsa_free(EVP_PKEY *pkey)
361			{
362		72	DSA_free(pkey->pkey.dsa);
363		36	}
364
365			static void
366			update_buflen(const BIGNUM b, size_t pbuflen)
367			{
368			size_t i;
369
370	✓✓	208	if (!b)
371		30	return;
372	✓✓	74	if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
373		22	*pbuflen = i;
374		178	}
375
376			static int
377			do_dsa_print(BIO bp, const DSA x, int off, int ptype)
378			{
379			unsigned char *m = NULL;
380			int ret = 0;
381		40	size_t buf_len = 0;
382			const char *ktype = NULL;
383			const BIGNUM priv_key, pub_key;
384
385	✓✓	20	if (ptype == 2)
386		16	priv_key = x->priv_key;
387			else
388			priv_key = NULL;
389
390	✓✓	20	if (ptype > 0)
391		18	pub_key = x->pub_key;
392			else
393			pub_key = NULL;
394
395	✓✓	20	if (ptype == 2)
396		16	ktype = "Private-Key";
397	✓✓	4	else if (ptype == 1)
398		2	ktype = "Public-Key";
399			else
400			ktype = "DSA-Parameters";
401
402		20	update_buflen(x->p, &buf_len);
403		20	update_buflen(x->q, &buf_len);
404		20	update_buflen(x->g, &buf_len);
405		20	update_buflen(priv_key, &buf_len);
406		20	update_buflen(pub_key, &buf_len);
407
408		20	m = malloc(buf_len + 10);
409	✗✓	20	if (m == NULL) {
410			DSAerror(ERR_R_MALLOC_FAILURE);
411			goto err;
412			}
413
414	✓✓	20	if (priv_key) {
415	✓✗	4	if (!BIO_indent(bp, off, 128))
416			goto err;
417	✓✗	8	if (BIO_printf(bp, "%s: (%d bit)\n", ktype,
418		8	BN_num_bits(x->p)) <= 0)
419			goto err;
420			}
421
422	✓✗	20	if (!ASN1_bn_print(bp, "priv:", priv_key, m, off))
423			goto err;
424	✓✗	20	if (!ASN1_bn_print(bp, "pub: ", pub_key, m, off))
425			goto err;
426	✓✗	20	if (!ASN1_bn_print(bp, "P: ", x->p, m, off))
427			goto err;
428	✓✗	20	if (!ASN1_bn_print(bp, "Q: ", x->q, m, off))
429			goto err;
430	✓✗	20	if (!ASN1_bn_print(bp, "G: ", x->g, m, off))
431			goto err;
432		20	ret = 1;
433			err:
434		20	free(m);
435		20	return(ret);
436		20	}
437
438			static int
439			dsa_param_decode(EVP_PKEY pkey, const unsigned char *pder, int derlen)
440			{
441			DSA *dsa;
442
443	✗✓	12	if (!(dsa = d2i_DSAparams(NULL, pder, derlen))) {
444			DSAerror(ERR_R_DSA_LIB);
445			return 0;
446			}
447		6	EVP_PKEY_assign_DSA(pkey, dsa);
448		6	return 1;
449		6	}
450
451			static int
452			dsa_param_encode(const EVP_PKEY pkey, unsigned char *pder)
453			{
454		16	return i2d_DSAparams(pkey->pkey.dsa, pder);
455			}
456
457			static int
458			dsa_param_print(BIO bp, const EVP_PKEY pkey, int indent, ASN1_PCTX *ctx)
459			{
460		4	return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
461			}
462
463			static int
464			dsa_pub_print(BIO bp, const EVP_PKEY pkey, int indent, ASN1_PCTX *ctx)
465			{
466		4	return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
467			}
468
469			static int
470			dsa_priv_print(BIO bp, const EVP_PKEY pkey, int indent, ASN1_PCTX *ctx)
471			{
472		32	return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
473			}
474
475			static int
476			old_dsa_priv_decode(EVP_PKEY pkey, const unsigned char *pder, int derlen)
477			{
478			DSA *dsa;
479			BN_CTX *ctx = NULL;
480			BIGNUM j, p1, *newp1;
481
482	✗✓	8	if (!(dsa = d2i_DSAPrivateKey(NULL, pder, derlen))) {
483			DSAerror(ERR_R_DSA_LIB);
484			return 0;
485			}
486
487		4	ctx = BN_CTX_new();
488	✓✗	4	if (ctx == NULL)
489			goto err;
490
491			/*
492			* Check that p and q are consistent with each other.
493			*/
494
495		4	j = BN_CTX_get(ctx);
496		4	p1 = BN_CTX_get(ctx);
497		4	newp1 = BN_CTX_get(ctx);
498	✓✗	4	if (j == NULL \|\| p1 == NULL \|\| newp1 == NULL)
499			goto err;
500			/* p1 = p - 1 */
501	✓✗	4	if (BN_sub(p1, dsa->p, BN_value_one()) == 0)
502			goto err;
503			/* j = (p - 1) / q */
504	✓✗	4	if (BN_div_ct(j, NULL, p1, dsa->q, ctx) == 0)
505			goto err;
506			/* q * j should == p - 1 */
507	✓✗	4	if (BN_mul(newp1, dsa->q, j, ctx) == 0)
508			goto err;
509	✗✓	4	if (BN_cmp(newp1, p1) != 0) {
510			DSAerror(DSA_R_BAD_Q_VALUE);
511			goto err;
512			}
513
514			/*
515			* Check that q is not a composite number.
516			*/
517
518	✗✓	4	if (BN_is_prime_ex(dsa->q, BN_prime_checks, ctx, NULL) == 0) {
519			DSAerror(DSA_R_BAD_Q_VALUE);
520			goto err;
521			}
522
523		4	BN_CTX_free(ctx);
524
525		4	EVP_PKEY_assign_DSA(pkey, dsa);
526		4	return 1;
527
528			err:
529			BN_CTX_free(ctx);
530			DSA_free(dsa);
531			return 0;
532		4	}
533
534			static int
535			old_dsa_priv_encode(const EVP_PKEY pkey, unsigned char *pder)
536			{
537			return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
538			}
539
540			static int
541			dsa_sig_print(BIO bp, const X509_ALGOR sigalg, const ASN1_STRING *sig,
542			int indent, ASN1_PCTX *pctx)
543			{
544			DSA_SIG *dsa_sig;
545		8	const unsigned char *p;
546
547	✓✓	4	if (!sig) {
548	✗✓	2	if (BIO_puts(bp, "\n") <= 0)
549			return 0;
550			else
551		2	return 1;
552			}
553		2	p = sig->data;
554		2	dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length);
555	✓✗	2	if (dsa_sig) {
556			int rv = 0;
557		2	size_t buf_len = 0;
558			unsigned char *m = NULL;
559
560		2	update_buflen(dsa_sig->r, &buf_len);
561		2	update_buflen(dsa_sig->s, &buf_len);
562		2	m = malloc(buf_len + 10);
563	✗✓	2	if (m == NULL) {
564			DSAerror(ERR_R_MALLOC_FAILURE);
565			goto err;
566			}
567
568	✓✗	2	if (BIO_write(bp, "\n", 1) != 1)
569			goto err;
570
571	✓✗	2	if (!ASN1_bn_print(bp, "r: ", dsa_sig->r, m, indent))
572			goto err;
573	✓✗	2	if (!ASN1_bn_print(bp, "s: ", dsa_sig->s, m, indent))
574			goto err;
575		2	rv = 1;
576			err:
577		2	free(m);
578		2	DSA_SIG_free(dsa_sig);
579			return rv;
580		2	}
581			return X509_signature_dump(bp, sig, indent);
582		4	}
583
584			static int
585			dsa_pkey_ctrl(EVP_PKEY pkey, int op, long arg1, void arg2)
586			{
587			switch (op) {
588			case ASN1_PKEY_CTRL_PKCS7_SIGN:
589			if (arg1 == 0) {
590			int snid, hnid;
591			X509_ALGOR alg1, alg2;
592
593			PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
594			if (alg1 == NULL \|\| alg1->algorithm == NULL)
595			return -1;
596			hnid = OBJ_obj2nid(alg1->algorithm);
597			if (hnid == NID_undef)
598			return -1;
599			if (!OBJ_find_sigid_by_algs(&snid, hnid,
600			EVP_PKEY_id(pkey)))
601			return -1;
602			X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF,
603			0);
604			}
605			return 1;
606
607			case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
608			(int )arg2 = NID_sha1;
609			return 2;
610
611			default:
612			return -2;
613			}
614			}
615
616			/* NB these are sorted in pkey_id order, lowest first */
617
618			const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] = {
619			{
620			.pkey_id = EVP_PKEY_DSA2,
621			.pkey_base_id = EVP_PKEY_DSA,
622			.pkey_flags = ASN1_PKEY_ALIAS
623			},
624
625			{
626			.pkey_id = EVP_PKEY_DSA1,
627			.pkey_base_id = EVP_PKEY_DSA,
628			.pkey_flags = ASN1_PKEY_ALIAS
629			},
630
631			{
632			.pkey_id = EVP_PKEY_DSA4,
633			.pkey_base_id = EVP_PKEY_DSA,
634			.pkey_flags = ASN1_PKEY_ALIAS
635			},
636
637			{
638			.pkey_id = EVP_PKEY_DSA3,
639			.pkey_base_id = EVP_PKEY_DSA,
640			.pkey_flags = ASN1_PKEY_ALIAS
641			},
642
643			{
644			.pkey_id = EVP_PKEY_DSA,
645			.pkey_base_id = EVP_PKEY_DSA,
646
647			.pem_str = "DSA",
648			.info = "OpenSSL DSA method",
649
650			.pub_decode = dsa_pub_decode,
651			.pub_encode = dsa_pub_encode,
652			.pub_cmp = dsa_pub_cmp,
653			.pub_print = dsa_pub_print,
654
655			.priv_decode = dsa_priv_decode,
656			.priv_encode = dsa_priv_encode,
657			.priv_print = dsa_priv_print,
658
659			.pkey_size = int_dsa_size,
660			.pkey_bits = dsa_bits,
661
662			.param_decode = dsa_param_decode,
663			.param_encode = dsa_param_encode,
664			.param_missing = dsa_missing_parameters,
665			.param_copy = dsa_copy_parameters,
666			.param_cmp = dsa_cmp_parameters,
667			.param_print = dsa_param_print,
668			.sig_print = dsa_sig_print,
669
670			.pkey_free = int_dsa_free,
671			.pkey_ctrl = dsa_pkey_ctrl,
672			.old_priv_decode = old_dsa_priv_decode,
673			.old_priv_encode = old_dsa_priv_encode
674			}
675			};