crypto/asn1/a_sign.c

   1 /*
   2  * Copyright 1995-2021 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 <time.h>
  12 #include <sys/types.h>
  13
  14 #include "internal/cryptlib.h"
  15
  16 #include <openssl/bn.h>
  17 #include <openssl/evp.h>
  18 #include <openssl/x509.h>
  19 #include <openssl/objects.h>
  20 #include <openssl/buffer.h>
  21 #include <openssl/core_names.h>
  22 #include "crypto/asn1.h"
  23 #include "crypto/evp.h"
  24
  25 #ifndef OPENSSL_NO_DEPRECATED_3_0
  26
  27 int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
  28               ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
  29               const EVP_MD *type)
  30 {
  31     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
  32     unsigned char *p, *buf_in = NULL, *buf_out = NULL;
  33     int i, inl = 0, outl = 0;
  34     size_t inll = 0, outll = 0;
  35     X509_ALGOR *a;
  36
  37     if (ctx == NULL) {
  38         ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
  39         goto err;
  40     }
  41     for (i = 0; i < 2; i++) {
  42         if (i == 0)
  43             a = algor1;
  44         else
  45             a = algor2;
  46         if (a == NULL)
  47             continue;
  48         if (type->pkey_type == NID_dsaWithSHA1) {
  49             /*
  50              * special case: RFC 2459 tells us to omit 'parameters' with
  51              * id-dsa-with-sha1
  52              */
  53             ASN1_TYPE_free(a->parameter);
  54             a->parameter = NULL;
  55         } else if ((a->parameter == NULL) ||
  56                    (a->parameter->type != V_ASN1_NULL)) {
  57             ASN1_TYPE_free(a->parameter);
  58             if ((a->parameter = ASN1_TYPE_new()) == NULL)
  59                 goto err;
  60             a->parameter->type = V_ASN1_NULL;
  61         }
  62         ASN1_OBJECT_free(a->algorithm);
  63         a->algorithm = OBJ_nid2obj(type->pkey_type);
  64         if (a->algorithm == NULL) {
  65             ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_OBJECT_TYPE);
  66             goto err;
  67         }
  68         if (a->algorithm->length == 0) {
  69             ERR_raise(ERR_LIB_ASN1,
  70                       ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
  71             goto err;
  72         }
  73     }
  74     inl = i2d(data, NULL);
  75     if (inl <= 0) {
  76         ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
  77         goto err;
  78     }
  79     inll = (size_t)inl;
  80     buf_in = OPENSSL_malloc(inll);
  81     outll = outl = EVP_PKEY_size(pkey);
  82     buf_out = OPENSSL_malloc(outll);
  83     if (buf_in == NULL || buf_out == NULL) {
  84         outl = 0;
  85         ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
  86         goto err;
  87     }
  88     p = buf_in;
  89
  90     i2d(data, &p);
  91     if (!EVP_SignInit_ex(ctx, type, NULL)
  92         || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
  93         || !EVP_SignFinal(ctx, (unsigned char *)buf_out,
  94                           (unsigned int *)&outl, pkey)) {
  95         outl = 0;
  96         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
  97         goto err;
  98     }
  99     OPENSSL_free(signature->data);
 100     signature->data = buf_out;
 101     buf_out = NULL;
 102     signature->length = outl;
 103     /*
 104      * In the interests of compatibility, I'll make sure that the bit string
 105      * has a 'not-used bits' value of 0
 106      */
 107     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 108     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 109  err:
 110     EVP_MD_CTX_free(ctx);
 111     OPENSSL_clear_free((char *)buf_in, inll);
 112     OPENSSL_clear_free((char *)buf_out, outll);
 113     return outl;
 114 }
 115
 116 #endif
 117
 118 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
 119                    ASN1_BIT_STRING *signature, const void *data,
 120                    EVP_PKEY *pkey, const EVP_MD *md)
 121 {
 122     return ASN1_item_sign_ex(it, algor1, algor2, signature, data, NULL, pkey,
 123                              md, NULL, NULL);
 124 }
 125
 126 int ASN1_item_sign_ex(const ASN1_ITEM *it, X509_ALGOR *algor1,
 127                       X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
 128                       const void *data, const ASN1_OCTET_STRING *id,
 129                       EVP_PKEY *pkey, const EVP_MD *md, OSSL_LIB_CTX *libctx,
 130                       const char *propq)
 131 {
 132     int rv = 0;
 133     EVP_MD_CTX *ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq);
 134
 135     if (ctx == NULL) {
 136         ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 137         return 0;
 138     }
 139     /* We can use the non _ex variant here since the pkey is already setup */
 140     if (!EVP_DigestSignInit(ctx, NULL, md, NULL, pkey))
 141         goto err;
 142
 143     rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, data, ctx);
 144
 145  err:
 146     EVP_PKEY_CTX_free(EVP_MD_CTX_pkey_ctx(ctx));
 147     EVP_MD_CTX_free(ctx);
 148     return rv;
 149 }
 150
 151 int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
 152                        X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
 153                        const void *data, EVP_MD_CTX *ctx)
 154 {
 155     const EVP_MD *md;
 156     EVP_PKEY *pkey;
 157     unsigned char *buf_in = NULL, *buf_out = NULL;
 158     size_t inl = 0, outl = 0, outll = 0;
 159     int signid, paramtype, buf_len = 0;
 160     int rv, pkey_id;
 161
 162     md = EVP_MD_CTX_md(ctx);
 163     pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
 164
 165     if (pkey == NULL) {
 166         ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 167         goto err;
 168     }
 169
 170     if (pkey->ameth == NULL) {
 171         EVP_PKEY_CTX *pctx = EVP_MD_CTX_pkey_ctx(ctx);
 172         OSSL_PARAM params[2];
 173         unsigned char aid[128];
 174         size_t aid_len = 0;
 175
 176         if (pctx == NULL
 177             || !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
 178             ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 179             goto err;
 180         }
 181
 182         params[0] =
 183             OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
 184                                               aid, sizeof(aid));
 185         params[1] = OSSL_PARAM_construct_end();
 186
 187         if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
 188             goto err;
 189
 190         if ((aid_len = params[0].return_size) == 0) {
 191             ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 192             goto err;
 193         }
 194
 195         if (algor1 != NULL) {
 196             const unsigned char *pp = aid;
 197
 198             if (d2i_X509_ALGOR(&algor1, &pp, aid_len) == NULL) {
 199                 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 200                 goto err;
 201             }
 202         }
 203
 204         if (algor2 != NULL) {
 205             const unsigned char *pp = aid;
 206
 207             if (d2i_X509_ALGOR(&algor2, &pp, aid_len) == NULL) {
 208                 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 209                 goto err;
 210             }
 211         }
 212
 213         rv = 3;
 214     } else if (pkey->ameth->item_sign) {
 215         rv = pkey->ameth->item_sign(ctx, it, data, algor1, algor2, signature);
 216         if (rv == 1)
 217             outl = signature->length;
 218         /*-
 219          * Return value meanings:
 220          * <=0: error.
 221          *   1: method does everything.
 222          *   2: carry on as normal.
 223          *   3: ASN1 method sets algorithm identifiers: just sign.
 224          */
 225         if (rv <= 0)
 226             ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 227         if (rv <= 1)
 228             goto err;
 229     } else {
 230         rv = 2;
 231     }
 232
 233     if (rv == 2) {
 234         if (md == NULL) {
 235             ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 236             goto err;
 237         }
 238
 239         pkey_id =
 240 #ifndef OPENSSL_NO_SM2
 241             EVP_PKEY_id(pkey) == NID_sm2 ? NID_sm2 :
 242 #endif
 243             pkey->ameth->pkey_id;
 244
 245         if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(md), pkey_id)) {
 246             ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 247             goto err;
 248         }
 249
 250         if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
 251             paramtype = V_ASN1_NULL;
 252         else
 253             paramtype = V_ASN1_UNDEF;
 254
 255         if (algor1)
 256             X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
 257         if (algor2)
 258             X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
 259
 260     }
 261
 262     buf_len = ASN1_item_i2d(data, &buf_in, it);
 263     if (buf_len <= 0) {
 264         outl = 0;
 265         ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 266         goto err;
 267     }
 268     inl = buf_len;
 269     if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
 270         outl = 0;
 271         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 272         goto err;
 273     }
 274     outl = outll;
 275     buf_out = OPENSSL_malloc(outll);
 276     if (buf_in == NULL || buf_out == NULL) {
 277         outl = 0;
 278         ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 279         goto err;
 280     }
 281
 282     if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
 283         outl = 0;
 284         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 285         goto err;
 286     }
 287     OPENSSL_free(signature->data);
 288     signature->data = buf_out;
 289     buf_out = NULL;
 290     signature->length = outl;
 291     /*
 292      * In the interests of compatibility, I'll make sure that the bit string
 293      * has a 'not-used bits' value of 0
 294      */
 295     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 296     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 297  err:
 298     OPENSSL_clear_free((char *)buf_in, inl);
 299     OPENSSL_clear_free((char *)buf_out, outll);
 300     return outl;
 301 }