crypto/asn1/a_sign.c

   1 /*
   2  * Copyright 1995-2022 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_get_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     ASN1_STRING_set0(signature, buf_out, outl);
 100     buf_out = NULL;
 101     /*
 102      * In the interests of compatibility, I'll make sure that the bit string
 103      * has a 'not-used bits' value of 0
 104      */
 105     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 106     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 107  err:
 108     EVP_MD_CTX_free(ctx);
 109     OPENSSL_clear_free((char *)buf_in, inll);
 110     OPENSSL_clear_free((char *)buf_out, outll);
 111     return outl;
 112 }
 113
 114 #endif
 115
 116 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
 117                    ASN1_BIT_STRING *signature, const void *data,
 118                    EVP_PKEY *pkey, const EVP_MD *md)
 119 {
 120     return ASN1_item_sign_ex(it, algor1, algor2, signature, data, NULL, pkey,
 121                              md, NULL, NULL);
 122 }
 123
 124 int ASN1_item_sign_ex(const ASN1_ITEM *it, X509_ALGOR *algor1,
 125                       X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
 126                       const void *data, const ASN1_OCTET_STRING *id,
 127                       EVP_PKEY *pkey, const EVP_MD *md, OSSL_LIB_CTX *libctx,
 128                       const char *propq)
 129 {
 130     int rv = 0;
 131     EVP_MD_CTX *ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq);
 132
 133     if (ctx == NULL) {
 134         ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 135         return 0;
 136     }
 137     /* We can use the non _ex variant here since the pkey is already setup */
 138     if (!EVP_DigestSignInit(ctx, NULL, md, NULL, pkey))
 139         goto err;
 140
 141     rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, data, ctx);
 142
 143  err:
 144     EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
 145     EVP_MD_CTX_free(ctx);
 146     return rv;
 147 }
 148
 149 int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
 150                        X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
 151                        const void *data, EVP_MD_CTX *ctx)
 152 {
 153     const EVP_MD *md;
 154     EVP_PKEY *pkey;
 155     unsigned char *buf_in = NULL, *buf_out = NULL;
 156     size_t inl = 0, outl = 0, outll = 0;
 157     int signid, paramtype, buf_len = 0;
 158     int rv, pkey_id;
 159
 160     md = EVP_MD_CTX_get0_md(ctx);
 161     pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
 162
 163     if (pkey == NULL) {
 164         ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 165         goto err;
 166     }
 167
 168     if (pkey->ameth == NULL) {
 169         EVP_PKEY_CTX *pctx = EVP_MD_CTX_get_pkey_ctx(ctx);
 170         OSSL_PARAM params[2];
 171         unsigned char aid[128];
 172         size_t aid_len = 0;
 173
 174         if (pctx == NULL
 175             || !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
 176             ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 177             goto err;
 178         }
 179
 180         params[0] =
 181             OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
 182                                               aid, sizeof(aid));
 183         params[1] = OSSL_PARAM_construct_end();
 184
 185         if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
 186             goto err;
 187
 188         if ((aid_len = params[0].return_size) == 0) {
 189             ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 190             goto err;
 191         }
 192
 193         if (algor1 != NULL) {
 194             const unsigned char *pp = aid;
 195
 196             if (d2i_X509_ALGOR(&algor1, &pp, aid_len) == NULL) {
 197                 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 198                 goto err;
 199             }
 200         }
 201
 202         if (algor2 != NULL) {
 203             const unsigned char *pp = aid;
 204
 205             if (d2i_X509_ALGOR(&algor2, &pp, aid_len) == NULL) {
 206                 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 207                 goto err;
 208             }
 209         }
 210
 211         rv = 3;
 212     } else if (pkey->ameth->item_sign) {
 213         rv = pkey->ameth->item_sign(ctx, it, data, algor1, algor2, signature);
 214         if (rv == 1)
 215             outl = signature->length;
 216         /*-
 217          * Return value meanings:
 218          * <=0: error.
 219          *   1: method does everything.
 220          *   2: carry on as normal.
 221          *   3: ASN1 method sets algorithm identifiers: just sign.
 222          */
 223         if (rv <= 0)
 224             ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 225         if (rv <= 1)
 226             goto err;
 227     } else {
 228         rv = 2;
 229     }
 230
 231     if (rv == 2) {
 232         if (md == NULL) {
 233             ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 234             goto err;
 235         }
 236
 237         pkey_id =
 238 #ifndef OPENSSL_NO_SM2
 239             EVP_PKEY_get_id(pkey) == NID_sm2 ? NID_sm2 :
 240 #endif
 241             pkey->ameth->pkey_id;
 242
 243         if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(md), pkey_id)) {
 244             ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 245             goto err;
 246         }
 247
 248         paramtype = pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL ?
 249             V_ASN1_NULL : V_ASN1_UNDEF;
 250         if (algor1 != NULL
 251             && !X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL))
 252             goto err;
 253         if (algor2 != NULL
 254             && !X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL))
 255             goto err;
 256     }
 257
 258     buf_len = ASN1_item_i2d(data, &buf_in, it);
 259     if (buf_len <= 0) {
 260         outl = 0;
 261         ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 262         goto err;
 263     }
 264     inl = buf_len;
 265     if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
 266         outl = 0;
 267         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 268         goto err;
 269     }
 270     outl = outll;
 271     buf_out = OPENSSL_malloc(outll);
 272     if (buf_in == NULL || buf_out == NULL) {
 273         outl = 0;
 274         ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 275         goto err;
 276     }
 277
 278     if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
 279         outl = 0;
 280         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 281         goto err;
 282     }
 283     ASN1_STRING_set0(signature, buf_out, outl);
 284     buf_out = NULL;
 285     /*
 286      * In the interests of compatibility, I'll make sure that the bit string
 287      * has a 'not-used bits' value of 0
 288      */
 289     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 290     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 291  err:
 292     OPENSSL_clear_free((char *)buf_in, inl);
 293     OPENSSL_clear_free((char *)buf_out, outll);
 294     return outl;
 295 }