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 "internal/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 #include "internal/evp_int.h"
 128
 129 #ifndef NO_ASN1_OLD
 130
 131 int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
 132               ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
 133               const EVP_MD *type)
 134 {
 135     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
 136     unsigned char *p, *buf_in = NULL, *buf_out = NULL;
 137     int i, inl = 0, outl = 0, outll = 0;
 138     X509_ALGOR *a;
 139
 140     if (ctx == NULL) {
 141         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
 142         goto err;
 143     }
 144     for (i = 0; i < 2; i++) {
 145         if (i == 0)
 146             a = algor1;
 147         else
 148             a = algor2;
 149         if (a == NULL)
 150             continue;
 151         if (type->pkey_type == NID_dsaWithSHA1) {
 152             /*
 153              * special case: RFC 2459 tells us to omit 'parameters' with
 154              * id-dsa-with-sha1
 155              */
 156             ASN1_TYPE_free(a->parameter);
 157             a->parameter = NULL;
 158         } else if ((a->parameter == NULL) ||
 159                    (a->parameter->type != V_ASN1_NULL)) {
 160             ASN1_TYPE_free(a->parameter);
 161             if ((a->parameter = ASN1_TYPE_new()) == NULL)
 162                 goto err;
 163             a->parameter->type = V_ASN1_NULL;
 164         }
 165         ASN1_OBJECT_free(a->algorithm);
 166         a->algorithm = OBJ_nid2obj(type->pkey_type);
 167         if (a->algorithm == NULL) {
 168             ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);
 169             goto err;
 170         }
 171         if (a->algorithm->length == 0) {
 172             ASN1err(ASN1_F_ASN1_SIGN,
 173                     ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
 174             goto err;
 175         }
 176     }
 177     inl = i2d(data, NULL);
 178     buf_in = OPENSSL_malloc((unsigned int)inl);
 179     outll = outl = EVP_PKEY_size(pkey);
 180     buf_out = OPENSSL_malloc((unsigned int)outl);
 181     if ((buf_in == NULL) || (buf_out == NULL)) {
 182         outl = 0;
 183         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
 184         goto err;
 185     }
 186     p = buf_in;
 187
 188     i2d(data, &p);
 189     if (!EVP_SignInit_ex(ctx, type, NULL)
 190         || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
 191         || !EVP_SignFinal(ctx, (unsigned char *)buf_out,
 192                           (unsigned int *)&outl, pkey)) {
 193         outl = 0;
 194         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
 195         goto err;
 196     }
 197     OPENSSL_free(signature->data);
 198     signature->data = buf_out;
 199     buf_out = NULL;
 200     signature->length = outl;
 201     /*
 202      * In the interests of compatibility, I'll make sure that the bit string
 203      * has a 'not-used bits' value of 0
 204      */
 205     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 206     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 207  err:
 208     EVP_MD_CTX_free(ctx);
 209     OPENSSL_clear_free((char *)buf_in, (unsigned int)inl);
 210     OPENSSL_clear_free((char *)buf_out, outll);
 211     return (outl);
 212 }
 213
 214 #endif
 215
 216 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
 217                    X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
 218                    EVP_PKEY *pkey, const EVP_MD *type)
 219 {
 220     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
 221
 222     if (ctx == NULL) {
 223         ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE);
 224         return 0;
 225     }
 226     if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) {
 227         EVP_MD_CTX_free(ctx);
 228         return 0;
 229     }
 230     return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx);
 231 }
 232
 233 int ASN1_item_sign_ctx(const ASN1_ITEM *it,
 234                        X509_ALGOR *algor1, X509_ALGOR *algor2,
 235                        ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
 236 {
 237     const EVP_MD *type;
 238     EVP_PKEY *pkey;
 239     unsigned char *buf_in = NULL, *buf_out = NULL;
 240     size_t inl = 0, outl = 0, outll = 0;
 241     int signid, paramtype;
 242     int rv;
 243
 244     type = EVP_MD_CTX_md(ctx);
 245     pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
 246
 247     if (!type || !pkey) {
 248         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
 249         return 0;
 250     }
 251
 252     if (pkey->ameth->item_sign) {
 253         rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
 254         if (rv == 1)
 255             outl = signature->length;
 256         /*-
 257          * Return value meanings:
 258          * <=0: error.
 259          *   1: method does everything.
 260          *   2: carry on as normal.
 261          *   3: ASN1 method sets algorithm identifiers: just sign.
 262          */
 263         if (rv <= 0)
 264             ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
 265         if (rv <= 1)
 266             goto err;
 267     } else
 268         rv = 2;
 269
 270     if (rv == 2) {
 271         if (!pkey->ameth ||
 272             !OBJ_find_sigid_by_algs(&signid,
 273                                     EVP_MD_nid(type),
 274                                     pkey->ameth->pkey_id)) {
 275             ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
 276                     ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 277             return 0;
 278         }
 279
 280         if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
 281             paramtype = V_ASN1_NULL;
 282         else
 283             paramtype = V_ASN1_UNDEF;
 284
 285         if (algor1)
 286             X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
 287         if (algor2)
 288             X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
 289
 290     }
 291
 292     inl = ASN1_item_i2d(asn, &buf_in, it);
 293     outll = outl = EVP_PKEY_size(pkey);
 294     buf_out = OPENSSL_malloc((unsigned int)outl);
 295     if ((buf_in == NULL) || (buf_out == NULL)) {
 296         outl = 0;
 297         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
 298         goto err;
 299     }
 300
 301     if (!EVP_DigestSignUpdate(ctx, buf_in, inl)
 302         || !EVP_DigestSignFinal(ctx, buf_out, &outl)) {
 303         outl = 0;
 304         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
 305         goto err;
 306     }
 307     OPENSSL_free(signature->data);
 308     signature->data = buf_out;
 309     buf_out = NULL;
 310     signature->length = outl;
 311     /*
 312      * In the interests of compatibility, I'll make sure that the bit string
 313      * has a 'not-used bits' value of 0
 314      */
 315     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 316     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 317  err:
 318     EVP_MD_CTX_free(ctx);
 319     OPENSSL_clear_free((char *)buf_in, (unsigned int)inl);
 320     OPENSSL_clear_free((char *)buf_out, outll);
 321     return (outl);
 322 }