crypto/evp/m_sigver.c

   1 /*
   2  * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/x509.h>
  15 #include "internal/evp_int.h"
  16 #include "evp_locl.h"
  17
  18 static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen)
  19 {
  20     EVPerr(EVP_F_UPDATE, EVP_R_ONLY_ONESHOT_SUPPORTED);
  21     return 0;
  22 }
  23
  24 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  25                           const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
  26                           int ver)
  27 {
  28     if (ctx->pctx == NULL)
  29         ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  30     if (ctx->pctx == NULL)
  31         return 0;
  32
  33     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
  34
  35         if (type == NULL) {
  36             int def_nid;
  37             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
  38                 type = EVP_get_digestbynid(def_nid);
  39         }
  40
  41         if (type == NULL) {
  42             EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
  43             return 0;
  44         }
  45     }
  46
  47     if (ver) {
  48         if (ctx->pctx->pmeth->verifyctx_init) {
  49             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
  50                 return 0;
  51             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
  52         } else if (ctx->pctx->pmeth->digestverify != 0) {
  53             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
  54             ctx->update = update;
  55         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
  56             return 0;
  57         }
  58     } else {
  59         if (ctx->pctx->pmeth->signctx_init) {
  60             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
  61                 return 0;
  62             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
  63         } else if (ctx->pctx->pmeth->digestsign != 0) {
  64             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
  65             ctx->update = update;
  66         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
  67             return 0;
  68         }
  69     }
  70     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
  71         return 0;
  72     if (pctx)
  73         *pctx = ctx->pctx;
  74     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
  75         return 1;
  76     if (!EVP_DigestInit_ex(ctx, type, e))
  77         return 0;
  78     return 1;
  79 }
  80
  81 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  82                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
  83 {
  84     return do_sigver_init(ctx, pctx, type, e, pkey, 0);
  85 }
  86
  87 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  88                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
  89 {
  90     return do_sigver_init(ctx, pctx, type, e, pkey, 1);
  91 }
  92
  93 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
  94                         size_t *siglen)
  95 {
  96     int sctx = 0, r = 0;
  97     EVP_PKEY_CTX *pctx = ctx->pctx;
  98     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
  99         if (!sigret)
 100             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 101         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 102             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 103         else {
 104             EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(ctx->pctx);
 105             if (!dctx)
 106                 return 0;
 107             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 108             EVP_PKEY_CTX_free(dctx);
 109         }
 110         return r;
 111     }
 112     if (pctx->pmeth->signctx)
 113         sctx = 1;
 114     else
 115         sctx = 0;
 116     if (sigret) {
 117         unsigned char md[EVP_MAX_MD_SIZE];
 118         unsigned int mdlen = 0;
 119         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 120             if (sctx)
 121                 r = ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx);
 122             else
 123                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 124         } else {
 125             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 126             if (tmp_ctx == NULL)
 127                 return 0;
 128             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 129                 EVP_MD_CTX_free(tmp_ctx);
 130                 return 0;
 131             }
 132             if (sctx)
 133                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 134                                                   sigret, siglen, tmp_ctx);
 135             else
 136                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 137             EVP_MD_CTX_free(tmp_ctx);
 138         }
 139         if (sctx || !r)
 140             return r;
 141         if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
 142             return 0;
 143     } else {
 144         if (sctx) {
 145             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 146                 return 0;
 147         } else {
 148             int s = EVP_MD_size(ctx->digest);
 149             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 150                 return 0;
 151         }
 152     }
 153     return 1;
 154 }
 155
 156 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 157                    const unsigned char *tbs, size_t tbslen)
 158 {
 159     if (ctx->pctx->pmeth->digestsign != NULL)
 160         return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 161     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 162         return 0;
 163     return EVP_DigestSignFinal(ctx, sigret, siglen);
 164 }
 165
 166 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 167                           size_t siglen)
 168 {
 169     unsigned char md[EVP_MAX_MD_SIZE];
 170     int r = 0;
 171     unsigned int mdlen = 0;
 172     int vctx = 0;
 173
 174     if (ctx->pctx->pmeth->verifyctx)
 175         vctx = 1;
 176     else
 177         vctx = 0;
 178     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 179         if (vctx) {
 180             r = ctx->pctx->pmeth->verifyctx(ctx->pctx, sig, siglen, ctx);
 181         } else
 182             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 183     } else {
 184         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 185         if (tmp_ctx == NULL)
 186             return -1;
 187         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 188             EVP_MD_CTX_free(tmp_ctx);
 189             return -1;
 190         }
 191         if (vctx) {
 192             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 193                                                 sig, siglen, tmp_ctx);
 194         } else
 195             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 196         EVP_MD_CTX_free(tmp_ctx);
 197     }
 198     if (vctx || !r)
 199         return r;
 200     return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
 201 }
 202
 203 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 204                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 205 {
 206     if (ctx->pctx->pmeth->digestverify != NULL)
 207         return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 208     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 209         return -1;
 210     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 211 }