503 lines
11 KiB
C
503 lines
11 KiB
C
/* 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 "cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/asn1.h>
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#include <openssl/dh.h>
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#include <openssl/bn.h>
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#include "asn1_locl.h"
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static void int_dh_free(EVP_PKEY *pkey)
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{
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DH_free(pkey->pkey.dh);
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}
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static int dh_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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void *pval;
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ASN1_STRING *pstr;
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X509_ALGOR *palg;
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ASN1_INTEGER *public_key = NULL;
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DH *dh = 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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{
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DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
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goto err;
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}
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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 (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
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{
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DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_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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{
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DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
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goto err;
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}
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/* We have parameters now set public key */
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if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
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{
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DHerr(DH_F_DH_PUB_DECODE, DH_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_DH(pkey, dh);
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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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if (dh)
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DH_free(dh);
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return 0;
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}
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static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
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{
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DH *dh;
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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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ASN1_STRING *str;
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ASN1_INTEGER *pub_key = NULL;
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dh=pkey->pkey.dh;
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str = ASN1_STRING_new();
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str->length = i2d_DHparams(dh, &str->data);
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if (str->length <= 0)
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{
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DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
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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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pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
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if (!pub_key)
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goto err;
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penclen = i2d_ASN1_INTEGER(pub_key, &penc);
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ASN1_INTEGER_free(pub_key);
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if (penclen <= 0)
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{
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DHerr(DH_F_DH_PUB_ENCODE, 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_DH),
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ptype, pval, penc, penclen))
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return 1;
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err:
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if (penc)
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OPENSSL_free(penc);
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if (pval)
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ASN1_STRING_free(pval);
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return 0;
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}
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/* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
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* that the AlgorithmIdentifier contains the paramaters, the private key
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* is explcitly included and the pubkey must be recalculated.
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*/
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static int dh_priv_decode(EVP_PKEY *pkey, 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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void *pval;
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ASN1_STRING *pstr;
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X509_ALGOR *palg;
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ASN1_INTEGER *privkey = NULL;
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DH *dh = NULL;
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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)))
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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 (!(dh = d2i_DHparams(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 (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
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{
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DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR);
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goto dherr;
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}
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/* Calculate public key */
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if (!DH_generate_key(dh))
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goto dherr;
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EVP_PKEY_assign_DH(pkey, dh);
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ASN1_INTEGER_free(privkey);
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return 1;
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decerr:
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DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
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dherr:
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DH_free(dh);
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return 0;
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}
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static int dh_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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{
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DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
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goto err;
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}
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params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data);
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if (params->length <= 0)
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{
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DHerr(DH_F_DH_PRIV_ENCODE,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.dh->priv_key, NULL);
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if (!prkey)
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{
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DHerr(DH_F_DH_PRIV_ENCODE,DH_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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if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0,
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V_ASN1_SEQUENCE, params, dp, dplen))
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goto err;
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return 1;
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err:
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if (dp != NULL)
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OPENSSL_free(dp);
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if (params != NULL)
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ASN1_STRING_free(params);
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if (prkey != NULL)
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ASN1_INTEGER_free(prkey);
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return 0;
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}
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static void 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 dh_param_decode(EVP_PKEY *pkey,
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const unsigned char **pder, int derlen)
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{
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DH *dh;
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if (!(dh = d2i_DHparams(NULL, pder, derlen)))
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{
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DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
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return 0;
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}
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EVP_PKEY_assign_DH(pkey, dh);
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return 1;
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}
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static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
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{
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return i2d_DHparams(pkey->pkey.dh, pder);
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}
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static int do_dh_print(BIO *bp, const DH *x, int indent,
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ASN1_PCTX *ctx, int ptype)
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{
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unsigned char *m=NULL;
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int reason=ERR_R_BUF_LIB,ret=0;
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size_t buf_len=0;
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const char *ktype = NULL;
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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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update_buflen(x->p, &buf_len);
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if (buf_len == 0)
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{
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reason = ERR_R_PASSED_NULL_PARAMETER;
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goto err;
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}
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update_buflen(x->g, &buf_len);
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update_buflen(x->q, &buf_len);
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update_buflen(pub_key, &buf_len);
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update_buflen(priv_key, &buf_len);
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if (ptype == 2)
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ktype = "PKCS#3 DH Private-Key";
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else if (ptype == 1)
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ktype = "PKCS#3 DH Public-Key";
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else
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ktype = "PKCS#3 DH Parameters";
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m= OPENSSL_malloc(buf_len+10);
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if (m == NULL)
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{
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reason=ERR_R_MALLOC_FAILURE;
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goto err;
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}
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BIO_indent(bp, indent, 128);
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if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
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goto err;
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indent += 4;
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if (!ASN1_bn_print(bp,"private-key:",priv_key,m,indent)) goto err;
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if (!ASN1_bn_print(bp,"public-key:",pub_key,m,indent)) goto err;
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if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err;
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if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err;
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if (x->q && !ASN1_bn_print(bp,"subgroup order:",x->q,m,indent)) goto err;
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if (x->length != 0)
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{
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BIO_indent(bp, indent, 128);
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if (BIO_printf(bp,"recommended-private-length: %d bits\n",
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(int)x->length) <= 0) goto err;
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}
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ret=1;
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if (0)
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{
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err:
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DHerr(DH_F_DO_DH_PRINT,reason);
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}
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if (m != NULL) OPENSSL_free(m);
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return(ret);
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}
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static int int_dh_size(const EVP_PKEY *pkey)
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{
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return(DH_size(pkey->pkey.dh));
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}
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static int dh_bits(const EVP_PKEY *pkey)
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{
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return BN_num_bits(pkey->pkey.dh->p);
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}
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static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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if ( BN_cmp(a->pkey.dh->p,b->pkey.dh->p) ||
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BN_cmp(a->pkey.dh->g,b->pkey.dh->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 dh_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.dh->p)) == NULL)
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return 0;
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if (to->pkey.dh->p != NULL)
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BN_free(to->pkey.dh->p);
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to->pkey.dh->p=a;
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if ((a=BN_dup(from->pkey.dh->g)) == NULL)
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return 0;
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if (to->pkey.dh->g != NULL)
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BN_free(to->pkey.dh->g);
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to->pkey.dh->g=a;
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return 1;
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}
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static int dh_missing_parameters(const EVP_PKEY *a)
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{
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if (!a->pkey.dh->p || !a->pkey.dh->g)
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return 1;
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return 0;
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}
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static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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if (dh_cmp_parameters(a, b) == 0)
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return 0;
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if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->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 int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx)
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{
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return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
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}
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static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx)
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{
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return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
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}
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static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx)
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{
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return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
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}
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int DHparams_print(BIO *bp, const DH *x)
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{
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return do_dh_print(bp, x, 4, NULL, 0);
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}
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const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
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{
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EVP_PKEY_DH,
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EVP_PKEY_DH,
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0,
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"DH",
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"OpenSSL PKCS#3 DH method",
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dh_pub_decode,
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dh_pub_encode,
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dh_pub_cmp,
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dh_public_print,
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dh_priv_decode,
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dh_priv_encode,
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dh_private_print,
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int_dh_size,
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dh_bits,
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dh_param_decode,
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dh_param_encode,
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dh_missing_parameters,
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dh_copy_parameters,
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dh_cmp_parameters,
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dh_param_print,
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0,
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int_dh_free,
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0
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};
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