552 lines
14 KiB
C
552 lines
14 KiB
C
/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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* 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/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/evp.h>
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#include <openssl/dh.h>
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#include <openssl/bn.h>
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#ifndef OPENSSL_NO_DSA
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# include <openssl/dsa.h>
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#endif
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#include <openssl/objects.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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int subprime_len;
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/* message digest used for parameter generation */
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const EVP_MD *md;
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int rfc5114_param;
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/* Keygen callback info */
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int gentmp[2];
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/* KDF (if any) to use for DH */
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char kdf_type;
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/* OID to use for KDF */
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ASN1_OBJECT *kdf_oid;
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/* Message digest to use for key derivation */
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const EVP_MD *kdf_md;
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/* User key material */
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unsigned char *kdf_ukm;
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size_t kdf_ukmlen;
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/* KDF output length */
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size_t kdf_outlen;
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} DH_PKEY_CTX;
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static int pkey_dh_init(EVP_PKEY_CTX *ctx)
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{
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DH_PKEY_CTX *dctx;
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dctx = OPENSSL_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->subprime_len = -1;
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dctx->generator = 2;
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dctx->use_dsa = 0;
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dctx->md = NULL;
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dctx->rfc5114_param = 0;
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dctx->kdf_type = EVP_PKEY_DH_KDF_NONE;
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dctx->kdf_oid = NULL;
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dctx->kdf_md = NULL;
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dctx->kdf_ukm = NULL;
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dctx->kdf_ukmlen = 0;
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dctx->kdf_outlen = 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 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->subprime_len = sctx->subprime_len;
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dctx->generator = sctx->generator;
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dctx->use_dsa = sctx->use_dsa;
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dctx->md = sctx->md;
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dctx->rfc5114_param = sctx->rfc5114_param;
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dctx->kdf_type = sctx->kdf_type;
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dctx->kdf_oid = OBJ_dup(sctx->kdf_oid);
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if (!dctx->kdf_oid)
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return 0;
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dctx->kdf_md = sctx->kdf_md;
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if (dctx->kdf_ukm) {
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dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
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dctx->kdf_ukmlen = sctx->kdf_ukmlen;
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}
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dctx->kdf_outlen = sctx->kdf_outlen;
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return 1;
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}
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static void 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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if (dctx) {
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if (dctx->kdf_ukm)
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OPENSSL_free(dctx->kdf_ukm);
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if (dctx->kdf_oid)
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ASN1_OBJECT_free(dctx->kdf_oid);
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OPENSSL_free(dctx);
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}
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}
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static int 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_SUBPRIME_LEN:
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if (dctx->use_dsa == 0)
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return -2;
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dctx->subprime_len = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
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if (dctx->use_dsa)
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return -2;
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dctx->generator = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE:
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#ifdef OPENSSL_NO_DSA
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if (p1 != 0)
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return -2;
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#else
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if (p1 < 0 || p1 > 2)
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return -2;
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#endif
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dctx->use_dsa = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_RFC5114:
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if (p1 < 1 || p1 > 3)
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return -2;
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dctx->rfc5114_param = 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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case EVP_PKEY_CTRL_DH_KDF_TYPE:
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if (p1 == -2)
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return dctx->kdf_type;
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if (p1 != EVP_PKEY_DH_KDF_NONE && p1 != EVP_PKEY_DH_KDF_X9_42)
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return -2;
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dctx->kdf_type = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_KDF_MD:
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dctx->kdf_md = p2;
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return 1;
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case EVP_PKEY_CTRL_GET_DH_KDF_MD:
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*(const EVP_MD **)p2 = dctx->kdf_md;
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return 1;
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case EVP_PKEY_CTRL_DH_KDF_OUTLEN:
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if (p1 <= 0)
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return -2;
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dctx->kdf_outlen = (size_t)p1;
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return 1;
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case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN:
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*(int *)p2 = dctx->kdf_outlen;
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return 1;
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case EVP_PKEY_CTRL_DH_KDF_UKM:
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if (dctx->kdf_ukm)
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OPENSSL_free(dctx->kdf_ukm);
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dctx->kdf_ukm = p2;
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if (p2)
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dctx->kdf_ukmlen = p1;
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else
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dctx->kdf_ukmlen = 0;
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return 1;
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case EVP_PKEY_CTRL_GET_DH_KDF_UKM:
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*(unsigned char **)p2 = dctx->kdf_ukm;
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return dctx->kdf_ukmlen;
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case EVP_PKEY_CTRL_DH_KDF_OID:
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if (dctx->kdf_oid)
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ASN1_OBJECT_free(dctx->kdf_oid);
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dctx->kdf_oid = p2;
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return 1;
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case EVP_PKEY_CTRL_GET_DH_KDF_OID:
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*(ASN1_OBJECT **)p2 = dctx->kdf_oid;
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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 pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx,
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const char *type, const char *value)
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{
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if (!strcmp(type, "dh_paramgen_prime_len")) {
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int len;
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len = atoi(value);
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return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
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}
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if (!strcmp(type, "dh_rfc5114")) {
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DH_PKEY_CTX *dctx = ctx->data;
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int len;
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len = atoi(value);
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if (len < 0 || len > 3)
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return -2;
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dctx->rfc5114_param = len;
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return 1;
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}
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if (!strcmp(type, "dh_paramgen_generator")) {
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int len;
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len = atoi(value);
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return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
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}
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if (!strcmp(type, "dh_paramgen_subprime_len")) {
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int len;
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len = atoi(value);
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return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len);
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}
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if (!strcmp(type, "dh_paramgen_type")) {
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int typ;
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typ = atoi(value);
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return EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ);
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}
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return -2;
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}
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#ifndef OPENSSL_NO_DSA
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extern int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
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const EVP_MD *evpmd,
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const unsigned char *seed_in, size_t seed_len,
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unsigned char *seed_out, int *counter_ret,
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unsigned long *h_ret, BN_GENCB *cb);
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extern int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
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const EVP_MD *evpmd,
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const unsigned char *seed_in,
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size_t seed_len, int idx,
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unsigned char *seed_out, int *counter_ret,
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unsigned long *h_ret, BN_GENCB *cb);
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static DSA *dsa_dh_generate(DH_PKEY_CTX *dctx, BN_GENCB *pcb)
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{
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DSA *ret;
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int rv = 0;
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int prime_len = dctx->prime_len;
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int subprime_len = dctx->subprime_len;
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const EVP_MD *md = dctx->md;
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if (dctx->use_dsa > 2)
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return NULL;
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ret = DSA_new();
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if (!ret)
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return NULL;
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if (subprime_len == -1) {
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if (prime_len >= 2048)
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subprime_len = 256;
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else
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subprime_len = 160;
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}
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if (md == NULL) {
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if (prime_len >= 2048)
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md = EVP_sha256();
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else
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md = EVP_sha1();
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}
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if (dctx->use_dsa == 1)
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rv = dsa_builtin_paramgen(ret, prime_len, subprime_len, md,
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NULL, 0, NULL, NULL, NULL, pcb);
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else if (dctx->use_dsa == 2)
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rv = dsa_builtin_paramgen2(ret, prime_len, subprime_len, md,
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NULL, 0, -1, NULL, NULL, NULL, pcb);
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if (rv <= 0) {
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DSA_free(ret);
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return NULL;
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}
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return ret;
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}
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#endif
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static int 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 (dctx->rfc5114_param) {
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switch (dctx->rfc5114_param) {
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case 1:
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dh = DH_get_1024_160();
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break;
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case 2:
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dh = DH_get_2048_224();
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break;
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case 3:
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dh = DH_get_2048_256();
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break;
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default:
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return -2;
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}
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EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
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return 1;
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}
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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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#ifndef OPENSSL_NO_DSA
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if (dctx->use_dsa) {
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DSA *dsa_dh;
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dsa_dh = dsa_dh_generate(dctx, pcb);
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if (!dsa_dh)
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return 0;
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dh = DSA_dup_DH(dsa_dh);
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DSA_free(dsa_dh);
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if (!dh)
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return 0;
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EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
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return 1;
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}
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#endif
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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,
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dctx->prime_len, dctx->generator, 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 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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DHerr(DH_F_PKEY_DH_KEYGEN, 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(pkey, ctx->pmeth->pkey_id, 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 pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
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size_t *keylen)
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{
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int ret;
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DH *dh;
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DH_PKEY_CTX *dctx = ctx->data;
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BIGNUM *dhpub;
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if (!ctx->pkey || !ctx->peerkey) {
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DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET);
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return 0;
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}
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dh = ctx->pkey->pkey.dh;
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dhpub = ctx->peerkey->pkey.dh->pub_key;
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if (dctx->kdf_type == EVP_PKEY_DH_KDF_NONE) {
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if (key == NULL) {
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*keylen = DH_size(dh);
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return 1;
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}
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ret = DH_compute_key(key, dhpub, 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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} else if (dctx->kdf_type == EVP_PKEY_DH_KDF_X9_42) {
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unsigned char *Z = NULL;
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size_t Zlen = 0;
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if (!dctx->kdf_outlen || !dctx->kdf_oid)
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return 0;
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if (key == NULL) {
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*keylen = dctx->kdf_outlen;
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return 1;
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}
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if (*keylen != dctx->kdf_outlen)
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return 0;
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ret = 0;
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Zlen = DH_size(dh);
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Z = OPENSSL_malloc(Zlen);
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if (!Z) {
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goto err;
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}
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if (DH_compute_key_padded(Z, dhpub, dh) <= 0)
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goto err;
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if (!DH_KDF_X9_42(key, *keylen, Z, Zlen, dctx->kdf_oid,
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dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
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goto err;
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*keylen = dctx->kdf_outlen;
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ret = 1;
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err:
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if (Z) {
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OPENSSL_cleanse(Z, Zlen);
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OPENSSL_free(Z);
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}
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return ret;
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}
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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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EVP_PKEY_DH,
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0,
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pkey_dh_init,
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pkey_dh_copy,
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pkey_dh_cleanup,
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0,
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pkey_dh_paramgen,
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0,
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pkey_dh_keygen,
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0,
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0,
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0,
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0,
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0, 0,
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0, 0, 0, 0,
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|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
0,
|
|
pkey_dh_derive,
|
|
|
|
pkey_dh_ctrl,
|
|
pkey_dh_ctrl_str
|
|
};
|
|
|
|
const EVP_PKEY_METHOD dhx_pkey_meth = {
|
|
EVP_PKEY_DHX,
|
|
0,
|
|
pkey_dh_init,
|
|
pkey_dh_copy,
|
|
pkey_dh_cleanup,
|
|
|
|
0,
|
|
pkey_dh_paramgen,
|
|
|
|
0,
|
|
pkey_dh_keygen,
|
|
|
|
0,
|
|
0,
|
|
|
|
0,
|
|
0,
|
|
|
|
0, 0,
|
|
|
|
0, 0, 0, 0,
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
0,
|
|
pkey_dh_derive,
|
|
|
|
pkey_dh_ctrl,
|
|
pkey_dh_ctrl_str
|
|
};
|