crypto/asn1/a_sign.c

   1 /* crypto/asn1/a_sign.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include <time.h>
 114
 115 #include "cryptlib.h"
 116
 117 #ifndef NO_SYS_TYPES_H
 118 # include <sys/types.h>
 119 #endif
 120
 121 #include <openssl/bn.h>
 122 #include <openssl/evp.h>
 123 #include <openssl/x509.h>
 124 #include <openssl/objects.h>
 125 #include <openssl/buffer.h>
 126 #include "internal/asn1_int.h"
 127
 128 #ifndef NO_ASN1_OLD
 129
 130 int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
 131               ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
 132               const EVP_MD *type)
 133 {
 134     EVP_MD_CTX ctx;
 135     unsigned char *p, *buf_in = NULL, *buf_out = NULL;
 136     int i, inl = 0, outl = 0, outll = 0;
 137     X509_ALGOR *a;
 138
 139     EVP_MD_CTX_init(&ctx);
 140     for (i = 0; i < 2; i++) {
 141         if (i == 0)
 142             a = algor1;
 143         else
 144             a = algor2;
 145         if (a == NULL)
 146             continue;
 147         if (type->pkey_type == NID_dsaWithSHA1) {
 148             /*
 149              * special case: RFC 2459 tells us to omit 'parameters' with
 150              * id-dsa-with-sha1
 151              */
 152             ASN1_TYPE_free(a->parameter);
 153             a->parameter = NULL;
 154         } else if ((a->parameter == NULL) ||
 155                    (a->parameter->type != V_ASN1_NULL)) {
 156             ASN1_TYPE_free(a->parameter);
 157             if ((a->parameter = ASN1_TYPE_new()) == NULL)
 158                 goto err;
 159             a->parameter->type = V_ASN1_NULL;
 160         }
 161         ASN1_OBJECT_free(a->algorithm);
 162         a->algorithm = OBJ_nid2obj(type->pkey_type);
 163         if (a->algorithm == NULL) {
 164             ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);
 165             goto err;
 166         }
 167         if (a->algorithm->length == 0) {
 168             ASN1err(ASN1_F_ASN1_SIGN,
 169                     ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
 170             goto err;
 171         }
 172     }
 173     inl = i2d(data, NULL);
 174     buf_in = OPENSSL_malloc((unsigned int)inl);
 175     outll = outl = EVP_PKEY_size(pkey);
 176     buf_out = OPENSSL_malloc((unsigned int)outl);
 177     if ((buf_in == NULL) || (buf_out == NULL)) {
 178         outl = 0;
 179         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
 180         goto err;
 181     }
 182     p = buf_in;
 183
 184     i2d(data, &p);
 185     if (!EVP_SignInit_ex(&ctx, type, NULL)
 186         || !EVP_SignUpdate(&ctx, (unsigned char *)buf_in, inl)
 187         || !EVP_SignFinal(&ctx, (unsigned char *)buf_out,
 188                           (unsigned int *)&outl, pkey)) {
 189         outl = 0;
 190         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
 191         goto err;
 192     }
 193     if (signature->data != NULL)
 194         OPENSSL_free(signature->data);
 195     signature->data = buf_out;
 196     buf_out = NULL;
 197     signature->length = outl;
 198     /*
 199      * In the interests of compatibility, I'll make sure that the bit string
 200      * has a 'not-used bits' value of 0
 201      */
 202     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 203     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 204  err:
 205     EVP_MD_CTX_cleanup(&ctx);
 206     OPENSSL_clear_free((char *)buf_in, (unsigned int)inl);
 207     OPENSSL_clear_free((char *)buf_out, outll);
 208     return (outl);
 209 }
 210
 211 #endif
 212
 213 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
 214                    X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
 215                    EVP_PKEY *pkey, const EVP_MD *type)
 216 {
 217     EVP_MD_CTX ctx;
 218     EVP_MD_CTX_init(&ctx);
 219     if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) {
 220         EVP_MD_CTX_cleanup(&ctx);
 221         return 0;
 222     }
 223     return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);
 224 }
 225
 226 int ASN1_item_sign_ctx(const ASN1_ITEM *it,
 227                        X509_ALGOR *algor1, X509_ALGOR *algor2,
 228                        ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
 229 {
 230     const EVP_MD *type;
 231     EVP_PKEY *pkey;
 232     unsigned char *buf_in = NULL, *buf_out = NULL;
 233     size_t inl = 0, outl = 0, outll = 0;
 234     int signid, paramtype;
 235     int rv;
 236
 237     type = EVP_MD_CTX_md(ctx);
 238     pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
 239
 240     if (!type || !pkey) {
 241         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
 242         return 0;
 243     }
 244
 245     if (pkey->ameth->item_sign) {
 246         rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
 247         if (rv == 1)
 248             outl = signature->length;
 249         /*-
 250          * Return value meanings:
 251          * <=0: error.
 252          *   1: method does everything.
 253          *   2: carry on as normal.
 254          *   3: ASN1 method sets algorithm identifiers: just sign.
 255          */
 256         if (rv <= 0)
 257             ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
 258         if (rv <= 1)
 259             goto err;
 260     } else
 261         rv = 2;
 262
 263     if (rv == 2) {
 264         if (type->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) {
 265             if (!pkey->ameth ||
 266                 !OBJ_find_sigid_by_algs(&signid,
 267                                         EVP_MD_nid(type),
 268                                         pkey->ameth->pkey_id)) {
 269                 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
 270                         ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 271                 return 0;
 272             }
 273         } else
 274             signid = type->pkey_type;
 275
 276         if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
 277             paramtype = V_ASN1_NULL;
 278         else
 279             paramtype = V_ASN1_UNDEF;
 280
 281         if (algor1)
 282             X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
 283         if (algor2)
 284             X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
 285
 286     }
 287
 288     inl = ASN1_item_i2d(asn, &buf_in, it);
 289     outll = outl = EVP_PKEY_size(pkey);
 290     buf_out = OPENSSL_malloc((unsigned int)outl);
 291     if ((buf_in == NULL) || (buf_out == NULL)) {
 292         outl = 0;
 293         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
 294         goto err;
 295     }
 296
 297     if (!EVP_DigestSignUpdate(ctx, buf_in, inl)
 298         || !EVP_DigestSignFinal(ctx, buf_out, &outl)) {
 299         outl = 0;
 300         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
 301         goto err;
 302     }
 303     if (signature->data != NULL)
 304         OPENSSL_free(signature->data);
 305     signature->data = buf_out;
 306     buf_out = NULL;
 307     signature->length = outl;
 308     /*
 309      * In the interests of compatibility, I'll make sure that the bit string
 310      * has a 'not-used bits' value of 0
 311      */
 312     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 313     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 314  err:
 315     EVP_MD_CTX_cleanup(ctx);
 316     OPENSSL_clear_free((char *)buf_in, (unsigned int)inl);
 317     OPENSSL_clear_free((char *)buf_out, outll);
 318     return (outl);
 319 }