lib/libcrypto/evp/m_sigver.c

   1 /* $OpenBSD: m_sigver.c,v 1.7 2018/05/13 06:35:10 tb Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2006.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006,2007 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
  61 #include <openssl/err.h>
  62 #include <openssl/evp.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/x509.h>
  65
  66 #include "evp_locl.h"
  67
  68 static int
  69 do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
  70     ENGINE *e, EVP_PKEY *pkey, int ver)
  71 {
  72         if (ctx->pctx == NULL)
  73                 ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  74         if (ctx->pctx == NULL)
  75                 return 0;
  76
  77         if (type == NULL) {
  78                 int def_nid;
  79                 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
  80                         type = EVP_get_digestbynid(def_nid);
  81         }
  82
  83         if (type == NULL) {
  84                 EVPerror(EVP_R_NO_DEFAULT_DIGEST);
  85                 return 0;
  86         }
  87
  88         if (ver) {
  89                 if (ctx->pctx->pmeth->verifyctx_init) {
  90                         if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx,
  91                             ctx) <=0)
  92                                 return 0;
  93                         ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
  94                 } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
  95                         return 0;
  96         } else {
  97                 if (ctx->pctx->pmeth->signctx_init) {
  98                         if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
  99                                 return 0;
 100                         ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 101                 } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
 102                         return 0;
 103         }
 104         if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 105                 return 0;
 106         if (pctx)
 107                 *pctx = ctx->pctx;
 108         if (!EVP_DigestInit_ex(ctx, type, e))
 109                 return 0;
 110         return 1;
 111 }
 112
 113 int
 114 EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
 115     ENGINE *e, EVP_PKEY *pkey)
 116 {
 117         return do_sigver_init(ctx, pctx, type, e, pkey, 0);
 118 }
 119
 120 int
 121 EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
 122     ENGINE *e, EVP_PKEY *pkey)
 123 {
 124         return do_sigver_init(ctx, pctx, type, e, pkey, 1);
 125 }
 126
 127 int
 128 EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen)
 129 {
 130         int sctx, r = 0;
 131
 132         if (ctx->pctx->pmeth->signctx)
 133                 sctx = 1;
 134         else
 135                 sctx = 0;
 136         if (sigret) {
 137                 EVP_MD_CTX tmp_ctx;
 138                 unsigned char md[EVP_MAX_MD_SIZE];
 139                 unsigned int mdlen = 0;
 140                 EVP_MD_CTX_init(&tmp_ctx);
 141                 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
 142                         return 0;
 143                 if (sctx)
 144                         r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx,
 145                             sigret, siglen, &tmp_ctx);
 146                 else
 147                         r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
 148                 EVP_MD_CTX_cleanup(&tmp_ctx);
 149                 if (sctx || !r)
 150                         return r;
 151                 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
 152                         return 0;
 153         } else {
 154                 if (sctx) {
 155                         if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret,
 156                             siglen, ctx) <= 0)
 157                                 return 0;
 158                 } else {
 159                         int s = EVP_MD_size(ctx->digest);
 160                         if (s < 0 || EVP_PKEY_sign(ctx->pctx, sigret, siglen,
 161                             NULL, s) <= 0)
 162                                 return 0;
 163                 }
 164         }
 165         return 1;
 166 }
 167
 168 int
 169 EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig, size_t siglen)
 170 {
 171         EVP_MD_CTX tmp_ctx;
 172         unsigned char md[EVP_MAX_MD_SIZE];
 173         int r;
 174         unsigned int mdlen = 0;
 175         int vctx;
 176
 177         if (ctx->pctx->pmeth->verifyctx)
 178                 vctx = 1;
 179         else
 180                 vctx = 0;
 181         EVP_MD_CTX_init(&tmp_ctx);
 182         if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
 183                 return -1;
 184         if (vctx) {
 185                 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, sig,
 186                     siglen, &tmp_ctx);
 187         } else
 188                 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
 189         EVP_MD_CTX_cleanup(&tmp_ctx);
 190         if (vctx || !r)
 191                 return r;
 192         return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
 193 }