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214 lines
5.5 KiB
C
214 lines
5.5 KiB
C
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/* $OpenBSD: cm_pmeth.c,v 1.8 2014/07/11 08:44:48 jsing Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2010.
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*/
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/* ====================================================================
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* Copyright (c) 2010 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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#include <stdio.h>
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#include <string.h>
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#include <openssl/cmac.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include "evp_locl.h"
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/* The context structure and "key" is simply a CMAC_CTX */
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static int
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pkey_cmac_init(EVP_PKEY_CTX *ctx)
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{
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ctx->data = CMAC_CTX_new();
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if (!ctx->data)
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return 0;
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ctx->keygen_info_count = 0;
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return 1;
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}
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static int
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pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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if (!pkey_cmac_init(dst))
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return 0;
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if (!CMAC_CTX_copy(dst->data, src->data))
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return 0;
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return 1;
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}
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static void
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pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
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{
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CMAC_CTX_free(ctx->data);
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}
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static int
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pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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CMAC_CTX *cmkey = CMAC_CTX_new();
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CMAC_CTX *cmctx = ctx->data;
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if (!cmkey)
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return 0;
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if (!CMAC_CTX_copy(cmkey, cmctx)) {
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CMAC_CTX_free(cmkey);
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return 0;
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}
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EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);
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return 1;
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}
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static int
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int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
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{
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if (!CMAC_Update(ctx->pctx->data, data, count))
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return 0;
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return 1;
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}
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static int
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cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
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{
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EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
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mctx->update = int_update;
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return 1;
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}
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static int
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cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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EVP_MD_CTX *mctx)
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{
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return CMAC_Final(ctx->data, sig, siglen);
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}
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static int
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pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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CMAC_CTX *cmctx = ctx->data;
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switch (type) {
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case EVP_PKEY_CTRL_SET_MAC_KEY:
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if (!p2 || p1 < 0)
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return 0;
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if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
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return 0;
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break;
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case EVP_PKEY_CTRL_CIPHER:
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if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
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return 0;
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break;
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case EVP_PKEY_CTRL_MD:
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if (ctx->pkey && !CMAC_CTX_copy(ctx->data,
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(CMAC_CTX *)ctx->pkey->pkey.ptr))
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return 0;
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if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
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return 0;
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break;
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default:
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return -2;
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}
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return 1;
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}
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static int
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pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
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{
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if (!value)
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return 0;
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if (!strcmp(type, "key")) {
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void *p = (void *)value;
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return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY,
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strlen(p), p);
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}
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if (!strcmp(type, "cipher")) {
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const EVP_CIPHER *c;
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c = EVP_get_cipherbyname(value);
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if (!c)
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return 0;
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return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
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}
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if (!strcmp(type, "hexkey")) {
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unsigned char *key;
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int r;
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long keylen;
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key = string_to_hex(value, &keylen);
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if (!key)
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return 0;
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r = pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
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free(key);
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return r;
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}
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return -2;
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}
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const EVP_PKEY_METHOD cmac_pkey_meth = {
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.pkey_id = EVP_PKEY_CMAC,
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.flags = EVP_PKEY_FLAG_SIGCTX_CUSTOM,
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.init = pkey_cmac_init,
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.copy = pkey_cmac_copy,
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.cleanup = pkey_cmac_cleanup,
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.keygen = pkey_cmac_keygen,
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.signctx_init = cmac_signctx_init,
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.signctx = cmac_signctx,
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.ctrl = pkey_cmac_ctrl,
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.ctrl_str = pkey_cmac_ctrl_str
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};
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