crypto/hmac/hm_pmeth.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 2007.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2007 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  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/x509.h>
  62 #include <openssl/x509v3.h>
  63 #include <openssl/evp.h>
  64 #include <openssl/hmac.h>
  65 #include "internal/evp_int.h"
  66
  67 /* HMAC pkey context structure */
  68
  69 typedef struct {
  70     const EVP_MD *md;           /* MD for HMAC use */
  71     ASN1_OCTET_STRING ktmp;     /* Temp storage for key */
  72     HMAC_CTX ctx;
  73 } HMAC_PKEY_CTX;
  74
  75 static int pkey_hmac_init(EVP_PKEY_CTX *ctx)
  76 {
  77     HMAC_PKEY_CTX *hctx;
  78     hctx = OPENSSL_malloc(sizeof(*hctx));
  79     if (!hctx)
  80         return 0;
  81     hctx->md = NULL;
  82     hctx->ktmp.data = NULL;
  83     hctx->ktmp.length = 0;
  84     hctx->ktmp.flags = 0;
  85     hctx->ktmp.type = V_ASN1_OCTET_STRING;
  86     HMAC_CTX_init(&hctx->ctx);
  87
  88     ctx->data = hctx;
  89     ctx->keygen_info_count = 0;
  90
  91     return 1;
  92 }
  93
  94 static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
  95 {
  96     HMAC_PKEY_CTX *sctx, *dctx;
  97     if (!pkey_hmac_init(dst))
  98         return 0;
  99     sctx = src->data;
 100     dctx = dst->data;
 101     dctx->md = sctx->md;
 102     HMAC_CTX_init(&dctx->ctx);
 103     if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx))
 104         return 0;
 105     if (sctx->ktmp.data) {
 106         if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
 107                                    sctx->ktmp.data, sctx->ktmp.length))
 108             return 0;
 109     }
 110     return 1;
 111 }
 112
 113 static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx)
 114 {
 115     HMAC_PKEY_CTX *hctx = ctx->data;
 116
 117     HMAC_CTX_cleanup(&hctx->ctx);
 118     OPENSSL_clear_free(hctx->ktmp.data, hctx->ktmp.length);
 119     OPENSSL_free(hctx);
 120 }
 121
 122 static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 123 {
 124     ASN1_OCTET_STRING *hkey = NULL;
 125     HMAC_PKEY_CTX *hctx = ctx->data;
 126     if (!hctx->ktmp.data)
 127         return 0;
 128     hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
 129     if (!hkey)
 130         return 0;
 131     EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
 132
 133     return 1;
 134 }
 135
 136 static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
 137 {
 138     HMAC_PKEY_CTX *hctx = ctx->pctx->data;
 139     if (!HMAC_Update(&hctx->ctx, data, count))
 140         return 0;
 141     return 1;
 142 }
 143
 144 static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
 145 {
 146     HMAC_PKEY_CTX *hctx = ctx->data;
 147     HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT);
 148     EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
 149     mctx->update = int_update;
 150     return 1;
 151 }
 152
 153 static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 154                         EVP_MD_CTX *mctx)
 155 {
 156     unsigned int hlen;
 157     HMAC_PKEY_CTX *hctx = ctx->data;
 158     int l = EVP_MD_CTX_size(mctx);
 159
 160     if (l < 0)
 161         return 0;
 162     *siglen = l;
 163     if (!sig)
 164         return 1;
 165
 166     if (!HMAC_Final(&hctx->ctx, sig, &hlen))
 167         return 0;
 168     *siglen = (size_t)hlen;
 169     return 1;
 170 }
 171
 172 static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 173 {
 174     HMAC_PKEY_CTX *hctx = ctx->data;
 175     ASN1_OCTET_STRING *key;
 176     switch (type) {
 177
 178     case EVP_PKEY_CTRL_SET_MAC_KEY:
 179         if ((!p2 && p1 > 0) || (p1 < -1))
 180             return 0;
 181         if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
 182             return 0;
 183         break;
 184
 185     case EVP_PKEY_CTRL_MD:
 186         hctx->md = p2;
 187         break;
 188
 189     case EVP_PKEY_CTRL_DIGESTINIT:
 190         key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
 191         if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md,
 192                           ctx->engine))
 193             return 0;
 194         break;
 195
 196     default:
 197         return -2;
 198
 199     }
 200     return 1;
 201 }
 202
 203 static int pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
 204                               const char *type, const char *value)
 205 {
 206     if (!value) {
 207         return 0;
 208     }
 209     if (strcmp(type, "key") == 0) {
 210         void *p = (void *)value;
 211         return pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p);
 212     }
 213     if (strcmp(type, "hexkey") == 0) {
 214         unsigned char *key;
 215         int r;
 216         long keylen;
 217         key = string_to_hex(value, &keylen);
 218         if (!key)
 219             return 0;
 220         r = pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
 221         OPENSSL_free(key);
 222         return r;
 223     }
 224     return -2;
 225 }
 226
 227 const EVP_PKEY_METHOD hmac_pkey_meth = {
 228     EVP_PKEY_HMAC,
 229     0,
 230     pkey_hmac_init,
 231     pkey_hmac_copy,
 232     pkey_hmac_cleanup,
 233
 234     0, 0,
 235
 236     0,
 237     pkey_hmac_keygen,
 238
 239     0, 0,
 240
 241     0, 0,
 242
 243     0, 0,
 244
 245     hmac_signctx_init,
 246     hmac_signctx,
 247
 248     0, 0,
 249
 250     0, 0,
 251
 252     0, 0,
 253
 254     0, 0,
 255
 256     pkey_hmac_ctrl,
 257     pkey_hmac_ctrl_str
 258 };