700 lines
15 KiB
C
Executable File
700 lines
15 KiB
C
Executable File
/* $OpenBSD: dsa_ameth.c,v 1.28 2019/11/01 15:15:35 jsing 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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#include <stdio.h>
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#include <openssl/opensslconf.h>
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#include <openssl/asn1.h>
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#include <openssl/bn.h>
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#include <openssl/cms.h>
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#include <openssl/dsa.h>
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#include <openssl/err.h>
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#include <openssl/x509.h>
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#include "asn1_locl.h"
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#include "bn_lcl.h"
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static int
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dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
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{
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const unsigned char *p, *pm;
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int pklen, pmlen;
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int ptype;
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const void *pval;
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const ASN1_STRING *pstr;
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X509_ALGOR *palg;
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ASN1_INTEGER *public_key = NULL;
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DSA *dsa = NULL;
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if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
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return 0;
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X509_ALGOR_get0(NULL, &ptype, &pval, palg);
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if (ptype == V_ASN1_SEQUENCE) {
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pstr = pval;
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pm = pstr->data;
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pmlen = pstr->length;
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if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen))) {
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DSAerror(DSA_R_DECODE_ERROR);
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goto err;
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}
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} else if (ptype == V_ASN1_NULL || ptype == V_ASN1_UNDEF) {
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if (!(dsa = DSA_new())) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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} else {
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DSAerror(DSA_R_PARAMETER_ENCODING_ERROR);
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goto err;
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}
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if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) {
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DSAerror(DSA_R_DECODE_ERROR);
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goto err;
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}
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if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) {
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DSAerror(DSA_R_BN_DECODE_ERROR);
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goto err;
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}
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ASN1_INTEGER_free(public_key);
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EVP_PKEY_assign_DSA(pkey, dsa);
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return 1;
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err:
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if (public_key)
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ASN1_INTEGER_free(public_key);
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DSA_free(dsa);
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return 0;
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}
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static int
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dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
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{
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DSA *dsa;
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void *pval = NULL;
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int ptype;
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unsigned char *penc = NULL;
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int penclen;
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dsa = pkey->pkey.dsa;
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if (pkey->save_parameters && dsa->p && dsa->q && dsa->g) {
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ASN1_STRING *str;
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str = ASN1_STRING_new();
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if (str == NULL) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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str->length = i2d_DSAparams(dsa, &str->data);
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if (str->length <= 0) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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ASN1_STRING_free(str);
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goto err;
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}
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pval = str;
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ptype = V_ASN1_SEQUENCE;
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} else
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ptype = V_ASN1_UNDEF;
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dsa->write_params = 0;
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penclen = i2d_DSAPublicKey(dsa, &penc);
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if (penclen <= 0) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA), ptype, pval,
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penc, penclen))
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return 1;
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err:
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free(penc);
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ASN1_STRING_free(pval);
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return 0;
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}
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/* In PKCS#8 DSA: you just get a private key integer and parameters in the
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* AlgorithmIdentifier the pubkey must be recalculated.
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*/
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static int
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dsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
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{
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const unsigned char *p, *pm;
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int pklen, pmlen;
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int ptype;
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const void *pval;
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const ASN1_STRING *pstr;
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const X509_ALGOR *palg;
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ASN1_INTEGER *privkey = NULL;
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BN_CTX *ctx = NULL;
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DSA *dsa = NULL;
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int ret = 0;
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if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
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return 0;
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X509_ALGOR_get0(NULL, &ptype, &pval, palg);
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if (ptype != V_ASN1_SEQUENCE)
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goto decerr;
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if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
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goto decerr;
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if (privkey->type == V_ASN1_NEG_INTEGER)
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goto decerr;
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pstr = pval;
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pm = pstr->data;
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pmlen = pstr->length;
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if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
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goto decerr;
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/* We have parameters now set private key */
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if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) {
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DSAerror(DSA_R_BN_ERROR);
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goto dsaerr;
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}
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/* Calculate public key */
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if (!(dsa->pub_key = BN_new())) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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goto dsaerr;
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}
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if (!(ctx = BN_CTX_new())) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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goto dsaerr;
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}
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if (!BN_mod_exp_ct(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx)) {
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DSAerror(DSA_R_BN_ERROR);
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goto dsaerr;
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}
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if (!EVP_PKEY_assign_DSA(pkey, dsa))
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goto decerr;
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ret = 1;
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goto done;
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decerr:
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DSAerror(DSA_R_DECODE_ERROR);
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dsaerr:
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DSA_free(dsa);
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done:
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BN_CTX_free(ctx);
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ASN1_INTEGER_free(privkey);
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return ret;
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}
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static int
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dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
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{
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ASN1_STRING *params = NULL;
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ASN1_INTEGER *prkey = NULL;
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unsigned char *dp = NULL;
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int dplen;
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params = ASN1_STRING_new();
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if (!params) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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params->length = i2d_DSAparams(pkey->pkey.dsa, ¶ms->data);
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if (params->length <= 0) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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params->type = V_ASN1_SEQUENCE;
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/* Get private key into integer */
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prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
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if (!prkey) {
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DSAerror(DSA_R_BN_ERROR);
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goto err;
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}
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dplen = i2d_ASN1_INTEGER(prkey, &dp);
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ASN1_INTEGER_free(prkey);
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prkey = NULL;
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if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0, V_ASN1_SEQUENCE,
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params, dp, dplen))
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goto err;
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return 1;
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err:
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free(dp);
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ASN1_STRING_free(params);
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ASN1_INTEGER_free(prkey);
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return 0;
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}
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static int
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int_dsa_size(const EVP_PKEY *pkey)
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{
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return DSA_size(pkey->pkey.dsa);
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}
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static int
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dsa_bits(const EVP_PKEY *pkey)
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{
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return BN_num_bits(pkey->pkey.dsa->p);
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}
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static int
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dsa_missing_parameters(const EVP_PKEY *pkey)
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{
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DSA *dsa;
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dsa = pkey->pkey.dsa;
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if (dsa->p == NULL || dsa->q == NULL || dsa->g == NULL)
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return 1;
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return 0;
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}
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static int
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dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
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{
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BIGNUM *a;
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if ((a = BN_dup(from->pkey.dsa->p)) == NULL)
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return 0;
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BN_free(to->pkey.dsa->p);
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to->pkey.dsa->p = a;
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if ((a = BN_dup(from->pkey.dsa->q)) == NULL)
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return 0;
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BN_free(to->pkey.dsa->q);
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to->pkey.dsa->q = a;
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if ((a = BN_dup(from->pkey.dsa->g)) == NULL)
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return 0;
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BN_free(to->pkey.dsa->g);
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to->pkey.dsa->g = a;
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return 1;
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}
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static int
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dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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if (BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) ||
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BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) ||
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BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g))
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return 0;
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else
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return 1;
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}
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static int
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dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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if (BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) != 0)
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return 0;
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else
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return 1;
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}
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static void
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int_dsa_free(EVP_PKEY *pkey)
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{
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DSA_free(pkey->pkey.dsa);
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}
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static void
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update_buflen(const BIGNUM *b, size_t *pbuflen)
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{
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size_t i;
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if (!b)
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return;
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if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
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*pbuflen = i;
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}
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static int
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do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
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{
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unsigned char *m = NULL;
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int ret = 0;
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size_t buf_len = 0;
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const char *ktype = NULL;
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const BIGNUM *priv_key, *pub_key;
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if (ptype == 2)
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priv_key = x->priv_key;
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else
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priv_key = NULL;
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if (ptype > 0)
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pub_key = x->pub_key;
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else
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pub_key = NULL;
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if (ptype == 2)
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ktype = "Private-Key";
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else if (ptype == 1)
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ktype = "Public-Key";
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else
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ktype = "DSA-Parameters";
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update_buflen(x->p, &buf_len);
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update_buflen(x->q, &buf_len);
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update_buflen(x->g, &buf_len);
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update_buflen(priv_key, &buf_len);
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update_buflen(pub_key, &buf_len);
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m = malloc(buf_len + 10);
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if (m == NULL) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (priv_key) {
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if (!BIO_indent(bp, off, 128))
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goto err;
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if (BIO_printf(bp, "%s: (%d bit)\n", ktype,
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BN_num_bits(x->p)) <= 0)
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goto err;
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}
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if (!ASN1_bn_print(bp, "priv:", priv_key, m, off))
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goto err;
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if (!ASN1_bn_print(bp, "pub: ", pub_key, m, off))
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goto err;
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if (!ASN1_bn_print(bp, "P: ", x->p, m, off))
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goto err;
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if (!ASN1_bn_print(bp, "Q: ", x->q, m, off))
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goto err;
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if (!ASN1_bn_print(bp, "G: ", x->g, m, off))
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goto err;
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ret = 1;
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err:
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free(m);
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return(ret);
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}
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static int
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dsa_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
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{
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DSA *dsa;
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if (!(dsa = d2i_DSAparams(NULL, pder, derlen))) {
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DSAerror(ERR_R_DSA_LIB);
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return 0;
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}
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EVP_PKEY_assign_DSA(pkey, dsa);
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return 1;
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}
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static int
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dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
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{
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return i2d_DSAparams(pkey->pkey.dsa, pder);
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}
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static int
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dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
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{
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return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
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}
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static int
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dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
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{
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return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
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}
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static int
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dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
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{
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return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
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}
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static int
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old_dsa_priv_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
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{
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DSA *dsa;
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BN_CTX *ctx = NULL;
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BIGNUM *j, *p1, *newp1;
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if (!(dsa = d2i_DSAPrivateKey(NULL, pder, derlen))) {
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DSAerror(ERR_R_DSA_LIB);
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return 0;
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}
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ctx = BN_CTX_new();
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if (ctx == NULL)
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goto err;
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/*
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* Check that p and q are consistent with each other.
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*/
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j = BN_CTX_get(ctx);
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p1 = BN_CTX_get(ctx);
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newp1 = BN_CTX_get(ctx);
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if (j == NULL || p1 == NULL || newp1 == NULL)
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goto err;
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/* p1 = p - 1 */
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if (BN_sub(p1, dsa->p, BN_value_one()) == 0)
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goto err;
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/* j = (p - 1) / q */
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if (BN_div_ct(j, NULL, p1, dsa->q, ctx) == 0)
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goto err;
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/* q * j should == p - 1 */
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if (BN_mul(newp1, dsa->q, j, ctx) == 0)
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goto err;
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if (BN_cmp(newp1, p1) != 0) {
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DSAerror(DSA_R_BAD_Q_VALUE);
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goto err;
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}
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/*
|
|
* 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;
|
|
|
|
#ifndef OPENSSL_NO_CMS
|
|
case ASN1_PKEY_CTRL_CMS_SIGN:
|
|
if (arg1 == 0) {
|
|
int snid, hnid;
|
|
X509_ALGOR *alg1, *alg2;
|
|
|
|
CMS_SignerInfo_get0_algs(arg2, NULL, 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_CMS_RI_TYPE:
|
|
*(int *)arg2 = CMS_RECIPINFO_NONE;
|
|
return 1;
|
|
#endif
|
|
|
|
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
|
|
}
|
|
};
|