crypto/openssl/crypto/cmac/cm_pmeth.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 2010.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2010 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  */
  53
  54 #include <stdio.h>
  55 #include "cryptlib.h"
  56 #include <openssl/x509.h>
  57 #include <openssl/x509v3.h>
  58 #include <openssl/evp.h>
  59 #include <openssl/cmac.h>
  60 #include "evp_locl.h"
  61
  62 /* The context structure and "key" is simply a CMAC_CTX */
  63
  64 static int pkey_cmac_init(EVP_PKEY_CTX *ctx)
  65 {
  66     ctx->data = CMAC_CTX_new();
  67     if (!ctx->data)
  68         return 0;
  69     ctx->keygen_info_count = 0;
  70     return 1;
  71 }
  72
  73 static int pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
  74 {
  75     if (!pkey_cmac_init(dst))
  76         return 0;
  77     if (!CMAC_CTX_copy(dst->data, src->data))
  78         return 0;
  79     return 1;
  80 }
  81
  82 static void pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
  83 {
  84     CMAC_CTX_free(ctx->data);
  85 }
  86
  87 static int pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
  88 {
  89     CMAC_CTX *cmkey = CMAC_CTX_new();
  90     CMAC_CTX *cmctx = ctx->data;
  91     if (!cmkey)
  92         return 0;
  93     if (!CMAC_CTX_copy(cmkey, cmctx)) {
  94         CMAC_CTX_free(cmkey);
  95         return 0;
  96     }
  97     EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);
  98
  99     return 1;
 100 }
 101
 102 static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
 103 {
 104     if (!CMAC_Update(ctx->pctx->data, data, count))
 105         return 0;
 106     return 1;
 107 }
 108
 109 static int cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
 110 {
 111     EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
 112     mctx->update = int_update;
 113     return 1;
 114 }
 115
 116 static int cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 117                         EVP_MD_CTX *mctx)
 118 {
 119     return CMAC_Final(ctx->data, sig, siglen);
 120 }
 121
 122 static int pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 123 {
 124     CMAC_CTX *cmctx = ctx->data;
 125     switch (type) {
 126
 127     case EVP_PKEY_CTRL_SET_MAC_KEY:
 128         if (!p2 || p1 < 0)
 129             return 0;
 130         if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
 131             return 0;
 132         break;
 133
 134     case EVP_PKEY_CTRL_CIPHER:
 135         if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
 136             return 0;
 137         break;
 138
 139     case EVP_PKEY_CTRL_MD:
 140         if (ctx->pkey && !CMAC_CTX_copy(ctx->data,
 141                                         (CMAC_CTX *)ctx->pkey->pkey.ptr))
 142             return 0;
 143         if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
 144             return 0;
 145         break;
 146
 147     default:
 148         return -2;
 149
 150     }
 151     return 1;
 152 }
 153
 154 static int pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx,
 155                               const char *type, const char *value)
 156 {
 157     if (!value) {
 158         return 0;
 159     }
 160     if (!strcmp(type, "key")) {
 161         void *p = (void *)value;
 162         return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, strlen(p), p);
 163     }
 164     if (!strcmp(type, "cipher")) {
 165         const EVP_CIPHER *c;
 166         c = EVP_get_cipherbyname(value);
 167         if (!c)
 168             return 0;
 169         return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
 170     }
 171     if (!strcmp(type, "hexkey")) {
 172         unsigned char *key;
 173         int r;
 174         long keylen;
 175         key = string_to_hex(value, &keylen);
 176         if (!key)
 177             return 0;
 178         r = pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
 179         OPENSSL_free(key);
 180         return r;
 181     }
 182     return -2;
 183 }
 184
 185 const EVP_PKEY_METHOD cmac_pkey_meth = {
 186     EVP_PKEY_CMAC,
 187     EVP_PKEY_FLAG_SIGCTX_CUSTOM,
 188     pkey_cmac_init,
 189     pkey_cmac_copy,
 190     pkey_cmac_cleanup,
 191
 192     0, 0,
 193
 194     0,
 195     pkey_cmac_keygen,
 196
 197     0, 0,
 198
 199     0, 0,
 200
 201     0, 0,
 202
 203     cmac_signctx_init,
 204     cmac_signctx,
 205
 206     0, 0,
 207
 208     0, 0,
 209
 210     0, 0,
 211
 212     0, 0,
 213
 214     pkey_cmac_ctrl,
 215     pkey_cmac_ctrl_str
 216 };