crypto/evp/m_sigver.c

   1 /*
   2  * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 "crypto/evp.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     /*
  79      * This indicates the current algorithm requires
  80      * special treatment before hashing the tbs-message.
  81      */
  82     if (ctx->pctx->pmeth->digest_custom != NULL)
  83         return ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx);
  84
  85     return 1;
  86 }
  87
  88 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  89                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
  90 {
  91     return do_sigver_init(ctx, pctx, type, e, pkey, 0);
  92 }
  93
  94 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  95                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
  96 {
  97     return do_sigver_init(ctx, pctx, type, e, pkey, 1);
  98 }
  99
 100 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
 101                         size_t *siglen)
 102 {
 103     int sctx = 0, r = 0;
 104     EVP_PKEY_CTX *pctx = ctx->pctx;
 105     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 106         if (!sigret)
 107             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 108         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 109             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 110         else {
 111             EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(ctx->pctx);
 112             if (!dctx)
 113                 return 0;
 114             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 115             EVP_PKEY_CTX_free(dctx);
 116         }
 117         return r;
 118     }
 119     if (pctx->pmeth->signctx)
 120         sctx = 1;
 121     else
 122         sctx = 0;
 123     if (sigret) {
 124         unsigned char md[EVP_MAX_MD_SIZE];
 125         unsigned int mdlen = 0;
 126         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 127             if (sctx)
 128                 r = ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx);
 129             else
 130                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 131         } else {
 132             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 133             if (tmp_ctx == NULL)
 134                 return 0;
 135             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 136                 EVP_MD_CTX_free(tmp_ctx);
 137                 return 0;
 138             }
 139             if (sctx)
 140                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 141                                                   sigret, siglen, tmp_ctx);
 142             else
 143                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 144             EVP_MD_CTX_free(tmp_ctx);
 145         }
 146         if (sctx || !r)
 147             return r;
 148         if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
 149             return 0;
 150     } else {
 151         if (sctx) {
 152             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 153                 return 0;
 154         } else {
 155             int s = EVP_MD_size(ctx->digest);
 156             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 157                 return 0;
 158         }
 159     }
 160     return 1;
 161 }
 162
 163 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 164                    const unsigned char *tbs, size_t tbslen)
 165 {
 166     if (ctx->pctx->pmeth->digestsign != NULL)
 167         return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 168     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 169         return 0;
 170     return EVP_DigestSignFinal(ctx, sigret, siglen);
 171 }
 172
 173 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 174                           size_t siglen)
 175 {
 176     unsigned char md[EVP_MAX_MD_SIZE];
 177     int r = 0;
 178     unsigned int mdlen = 0;
 179     int vctx = 0;
 180
 181     if (ctx->pctx->pmeth->verifyctx)
 182         vctx = 1;
 183     else
 184         vctx = 0;
 185     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 186         if (vctx)
 187             r = ctx->pctx->pmeth->verifyctx(ctx->pctx, sig, siglen, ctx);
 188         else
 189             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 190     } else {
 191         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 192         if (tmp_ctx == NULL)
 193             return -1;
 194         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 195             EVP_MD_CTX_free(tmp_ctx);
 196             return -1;
 197         }
 198         if (vctx)
 199             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 200                                                 sig, siglen, tmp_ctx);
 201         else
 202             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 203         EVP_MD_CTX_free(tmp_ctx);
 204     }
 205     if (vctx || !r)
 206         return r;
 207     return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
 208 }
 209
 210 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 211                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 212 {
 213     if (ctx->pctx->pmeth->digestverify != NULL)
 214         return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 215     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 216         return -1;
 217     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 218 }