GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/dsa/dsa_pmeth.c Lines: 72 120 60.0 %
Date: 2017-11-13 Branches: 21 77 27.3 %

Line Branch Exec Source
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/* $OpenBSD: dsa_pmeth.c,v 1.11 2017/01/29 17:49:22 beck Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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 * project 2006.
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 */
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/* ====================================================================
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 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 *
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in
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 *    the documentation and/or other materials provided with the
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 *    distribution.
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 *
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 * 3. All advertising materials mentioning features or use of this
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 *    software must display the following acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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 *
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 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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 *    endorse or promote products derived from this software without
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 *    prior written permission. For written permission, please contact
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 *    licensing@OpenSSL.org.
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 *
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 * 5. Products derived from this software may not be called "OpenSSL"
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 *    nor may "OpenSSL" appear in their names without prior written
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 *    permission of the OpenSSL Project.
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 *
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 * 6. Redistributions of any form whatsoever must retain the following
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 *    acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ====================================================================
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 *
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 * This product includes cryptographic software written by Eric Young
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 * (eay@cryptsoft.com).  This product includes software written by Tim
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 * Hudson (tjh@cryptsoft.com).
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 *
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 */
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59
#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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63
#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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69
#include "dsa_locl.h"
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#include "evp_locl.h"
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72
/* DSA pkey context structure */
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74
typedef struct {
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	/* Parameter gen parameters */
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	int nbits;		/* size of p in bits (default: 1024) */
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	int qbits;		/* size of q in bits (default: 160)  */
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	const EVP_MD *pmd;	/* MD for parameter generation */
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	/* Keygen callback info */
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	int gentmp[2];
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	/* message digest */
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	const EVP_MD *md;	/* MD for the signature */
83
} DSA_PKEY_CTX;
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85
static int
86
pkey_dsa_init(EVP_PKEY_CTX *ctx)
87
{
88
	DSA_PKEY_CTX *dctx;
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90
20
	dctx = malloc(sizeof(DSA_PKEY_CTX));
91
10
	if (!dctx)
92
		return 0;
93
10
	dctx->nbits = 1024;
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10
	dctx->qbits = 160;
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10
	dctx->pmd = NULL;
96
10
	dctx->md = NULL;
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98
10
	ctx->data = dctx;
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10
	ctx->keygen_info = dctx->gentmp;
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10
	ctx->keygen_info_count = 2;
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102
10
	return 1;
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10
}
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105
static int
106
pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
107
{
108
	DSA_PKEY_CTX *dctx, *sctx;
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110
4
	if (!pkey_dsa_init(dst))
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		return 0;
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2
       	sctx = src->data;
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2
	dctx = dst->data;
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2
	dctx->nbits = sctx->nbits;
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2
	dctx->qbits = sctx->qbits;
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2
	dctx->pmd = sctx->pmd;
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2
	dctx->md  = sctx->md;
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2
	return 1;
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2
}
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121
static void
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pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
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{
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20
	DSA_PKEY_CTX *dctx = ctx->data;
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126
10
	free(dctx);
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10
}
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129
static int
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pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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    const unsigned char *tbs, size_t tbslen)
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{
133
	int ret, type;
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4
	unsigned int sltmp;
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2
	DSA_PKEY_CTX *dctx = ctx->data;
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2
	DSA *dsa = ctx->pkey->pkey.dsa;
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138
2
	if (dctx->md)
139
2
		type = EVP_MD_type(dctx->md);
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	else
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		type = NID_sha1;
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143
2
	ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
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145
2
	if (ret <= 0)
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		return ret;
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2
	*siglen = sltmp;
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2
	return 1;
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2
}
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151
static int
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pkey_dsa_verify(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
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    const unsigned char *tbs, size_t tbslen)
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{
155
	int ret, type;
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	DSA_PKEY_CTX *dctx = ctx->data;
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	DSA *dsa = ctx->pkey->pkey.dsa;
158
159
	if (dctx->md)
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		type = EVP_MD_type(dctx->md);
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	else
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		type = NID_sha1;
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164
	ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
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166
	return ret;
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}
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169
static int
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pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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12
	DSA_PKEY_CTX *dctx = ctx->data;
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174


6
	switch (type) {
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	case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
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2
		if (p1 < 256)
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			return -2;
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2
		dctx->nbits = p1;
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2
		return 1;
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181
	case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
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		if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
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			return -2;
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		dctx->qbits = p1;
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		return 1;
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	case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
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		switch (EVP_MD_type((const EVP_MD *)p2)) {
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		case NID_sha1:
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		case NID_sha224:
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		case NID_sha256:
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			break;
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		default:
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			DSAerror(DSA_R_INVALID_DIGEST_TYPE);
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			return 0;
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		}
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		dctx->md = p2;
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		return 1;
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200
	case EVP_PKEY_CTRL_MD:
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2
		switch (EVP_MD_type((const EVP_MD *)p2)) {
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		case NID_sha1:
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		case NID_dsa:
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		case NID_dsaWithSHA:
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		case NID_sha224:
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		case NID_sha256:
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		case NID_sha384:
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		case NID_sha512:
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			break;
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		default:
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			DSAerror(DSA_R_INVALID_DIGEST_TYPE);
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			return 0;
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		}
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		dctx->md = p2;
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		return 1;
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	case EVP_PKEY_CTRL_DIGESTINIT:
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	case EVP_PKEY_CTRL_PKCS7_SIGN:
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	case EVP_PKEY_CTRL_CMS_SIGN:
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		return 1;
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	case EVP_PKEY_CTRL_PEER_KEY:
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		DSAerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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		return -2;
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	default:
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		return -2;
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	}
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}
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static int
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pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
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{
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 	long lval;
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4
	char *ep;
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236
2
	if (!strcmp(type, "dsa_paramgen_bits")) {
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		int nbits;
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239
2
		errno = 0;
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2
		lval = strtol(value, &ep, 10);
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4
		if (value[0] == '\0' || *ep != '\0')
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			goto not_a_number;
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2
		if ((errno == ERANGE &&
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		    (lval == LONG_MAX || lval == LONG_MIN)) ||
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2
		    (lval > INT_MAX || lval < INT_MIN))
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			goto out_of_range;
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2
		nbits = lval;
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2
		return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
249
	} else if (!strcmp(type, "dsa_paramgen_q_bits")) {
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		int qbits;
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252
		errno = 0;
253
		lval = strtol(value, &ep, 10);
254
		if (value[0] == '\0' || *ep != '\0')
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			goto not_a_number;
256
		if ((errno == ERANGE &&
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		    (lval == LONG_MAX || lval == LONG_MIN)) ||
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		    (lval > INT_MAX || lval < INT_MIN))
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			goto out_of_range;
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		qbits = lval;
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		return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA,
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		    EVP_PKEY_OP_PARAMGEN, EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS,
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		    qbits, NULL);
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	} else if (!strcmp(type, "dsa_paramgen_md")) {
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		return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA,
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		    EVP_PKEY_OP_PARAMGEN, EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
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		    (void *)EVP_get_digestbyname(value));
268
	}
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not_a_number:
270
out_of_range:
271
	return -2;
272
2
}
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274
static int
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pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
276
{
277
	DSA *dsa = NULL;
278
4
	DSA_PKEY_CTX *dctx = ctx->data;
279
2
	BN_GENCB *pcb, cb;
280
	int ret;
281
282
2
	if (ctx->pkey_gencb) {
283
		pcb = &cb;
284
2
		evp_pkey_set_cb_translate(pcb, ctx);
285
2
	} else
286
		pcb = NULL;
287
2
	dsa = DSA_new();
288
2
	if (!dsa)
289
		return 0;
290
2
	ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
291
	    NULL, 0, NULL, NULL, NULL, pcb);
292
2
	if (ret)
293
2
		EVP_PKEY_assign_DSA(pkey, dsa);
294
	else
295
		DSA_free(dsa);
296
2
	return ret;
297
2
}
298
299
static int
300
pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
301
{
302
	DSA *dsa = NULL;
303
304
8
	if (ctx->pkey == NULL) {
305
		DSAerror(DSA_R_NO_PARAMETERS_SET);
306
		return 0;
307
	}
308
4
	dsa = DSA_new();
309
4
	if (!dsa)
310
		return 0;
311
4
	EVP_PKEY_assign_DSA(pkey, dsa);
312
	/* Note: if error return, pkey is freed by parent routine */
313
4
	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
314
		return 0;
315
4
	return DSA_generate_key(pkey->pkey.dsa);
316
4
}
317
318
const EVP_PKEY_METHOD dsa_pkey_meth = {
319
	.pkey_id = EVP_PKEY_DSA,
320
	.flags = EVP_PKEY_FLAG_AUTOARGLEN,
321
322
	.init = pkey_dsa_init,
323
	.copy = pkey_dsa_copy,
324
	.cleanup = pkey_dsa_cleanup,
325
326
	.paramgen = pkey_dsa_paramgen,
327
328
	.keygen = pkey_dsa_keygen,
329
330
	.sign = pkey_dsa_sign,
331
332
	.verify = pkey_dsa_verify,
333
334
	.ctrl = pkey_dsa_ctrl,
335
	.ctrl_str = pkey_dsa_ctrl_str
336
};