266 lines
6.6 KiB
C
Executable file
266 lines
6.6 KiB
C
Executable file
/* $OpenBSD: dh_pmeth.c,v 1.12 2022/01/07 09:27:13 tb 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 <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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#include <openssl/dh.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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#include "bn_lcl.h"
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#include "dh_local.h"
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#include "evp_locl.h"
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/* DH pkey context structure */
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typedef struct {
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/* Parameter gen parameters */
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int prime_len;
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int generator;
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int use_dsa;
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/* Keygen callback info */
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int gentmp[2];
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/* message digest */
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} DH_PKEY_CTX;
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static int
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pkey_dh_init(EVP_PKEY_CTX *ctx)
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{
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DH_PKEY_CTX *dctx;
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dctx = malloc(sizeof(DH_PKEY_CTX));
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if (!dctx)
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return 0;
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dctx->prime_len = 1024;
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dctx->generator = 2;
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dctx->use_dsa = 0;
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ctx->data = dctx;
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ctx->keygen_info = dctx->gentmp;
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ctx->keygen_info_count = 2;
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return 1;
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}
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static int
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pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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DH_PKEY_CTX *dctx, *sctx;
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if (!pkey_dh_init(dst))
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return 0;
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sctx = src->data;
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dctx = dst->data;
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dctx->prime_len = sctx->prime_len;
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dctx->generator = sctx->generator;
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dctx->use_dsa = sctx->use_dsa;
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return 1;
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}
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static void
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pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
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{
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DH_PKEY_CTX *dctx = ctx->data;
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free(dctx);
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}
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static int
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pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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DH_PKEY_CTX *dctx = ctx->data;
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switch (type) {
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case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
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if (p1 < 256)
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return -2;
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dctx->prime_len = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
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dctx->generator = p1;
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return 1;
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case EVP_PKEY_CTRL_PEER_KEY:
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/* Default behaviour is OK */
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return 1;
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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_dh_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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char *ep;
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int len;
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if (!strcmp(type, "dh_paramgen_prime_len")) {
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errno = 0;
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lval = strtol(value, &ep, 10);
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if (value[0] == '\0' || *ep != '\0')
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goto not_a_number;
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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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len = lval;
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return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
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} else if (!strcmp(type, "dh_paramgen_generator")) {
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errno = 0;
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lval = strtol(value, &ep, 10);
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if (value[0] == '\0' || *ep != '\0')
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goto not_a_number;
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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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len = lval;
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return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
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}
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not_a_number:
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out_of_range:
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return -2;
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}
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static int
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pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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DH *dh = NULL;
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DH_PKEY_CTX *dctx = ctx->data;
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BN_GENCB *pcb, cb;
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int ret;
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if (ctx->pkey_gencb) {
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pcb = &cb;
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evp_pkey_set_cb_translate(pcb, ctx);
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} else
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pcb = NULL;
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dh = DH_new();
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if (!dh)
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return 0;
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ret = DH_generate_parameters_ex(dh, dctx->prime_len, dctx->generator,
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pcb);
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if (ret)
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EVP_PKEY_assign_DH(pkey, dh);
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else
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DH_free(dh);
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return ret;
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}
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static int
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pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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DH *dh = NULL;
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if (ctx->pkey == NULL) {
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DHerror(DH_R_NO_PARAMETERS_SET);
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return 0;
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}
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dh = DH_new();
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if (!dh)
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return 0;
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EVP_PKEY_assign_DH(pkey, dh);
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/* Note: if error return, pkey is freed by parent routine */
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if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
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return 0;
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return DH_generate_key(pkey->pkey.dh);
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}
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static int
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pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
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{
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int ret;
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if (!ctx->pkey || !ctx->peerkey) {
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DHerror(DH_R_KEYS_NOT_SET);
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return 0;
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}
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ret = DH_compute_key(key, ctx->peerkey->pkey.dh->pub_key,
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ctx->pkey->pkey.dh);
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if (ret < 0)
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return ret;
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*keylen = ret;
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return 1;
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}
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const EVP_PKEY_METHOD dh_pkey_meth = {
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.pkey_id = EVP_PKEY_DH,
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.flags = EVP_PKEY_FLAG_AUTOARGLEN,
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.init = pkey_dh_init,
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.copy = pkey_dh_copy,
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.cleanup = pkey_dh_cleanup,
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.paramgen = pkey_dh_paramgen,
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.keygen = pkey_dh_keygen,
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.derive = pkey_dh_derive,
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.ctrl = pkey_dh_ctrl,
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.ctrl_str = pkey_dh_ctrl_str
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};
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