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_EVP_LIB);
  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         goto err;
  86     }
  87     p = buf_in;
  88
  89     i2d(data, &p);
  90     if (!EVP_SignInit_ex(ctx, type, NULL)
  91         || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
  92         || !EVP_SignFinal(ctx, (unsigned char *)buf_out,
  93                           (unsigned int *)&outl, pkey)) {
  94         outl = 0;
  95         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
  96         goto err;
  97     }
  98     ASN1_STRING_set0(signature, buf_out, outl);
  99     buf_out = NULL;
 100     /*
 101      * In the interests of compatibility, I'll make sure that the bit string
 102      * has a 'not-used bits' value of 0
 103      */
 104     ossl_asn1_string_set_bits_left(signature, 0);
 105  err:
 106     EVP_MD_CTX_free(ctx);
 107     OPENSSL_clear_free((char *)buf_in, inll);
 108     OPENSSL_clear_free((char *)buf_out, outll);
 109     return outl;
 110 }
 111
 112 #endif
 113
 114 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
 115                    ASN1_BIT_STRING *signature, const void *data,
 116                    EVP_PKEY *pkey, const EVP_MD *md)
 117 {
 118     return ASN1_item_sign_ex(it, algor1, algor2, signature, data, NULL, pkey,
 119                              md, NULL, NULL);
 120 }
 121
 122 int ASN1_item_sign_ex(const ASN1_ITEM *it, X509_ALGOR *algor1,
 123                       X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
 124                       const void *data, const ASN1_OCTET_STRING *id,
 125                       EVP_PKEY *pkey, const EVP_MD *md, OSSL_LIB_CTX *libctx,
 126                       const char *propq)
 127 {
 128     int rv = 0;
 129     EVP_MD_CTX *ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq);
 130
 131     if (ctx == NULL) {
 132         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 133         return 0;
 134     }
 135     /* We can use the non _ex variant here since the pkey is already setup */
 136     if (!EVP_DigestSignInit(ctx, NULL, md, NULL, pkey))
 137         goto err;
 138
 139     rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, data, ctx);
 140
 141  err:
 142     EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
 143     EVP_MD_CTX_free(ctx);
 144     return rv;
 145 }
 146
 147 int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
 148                        X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
 149                        const void *data, EVP_MD_CTX *ctx)
 150 {
 151     const EVP_MD *md;
 152     EVP_PKEY *pkey;
 153     unsigned char *buf_in = NULL, *buf_out = NULL;
 154     size_t inl = 0, outl = 0, outll = 0;
 155     int signid, paramtype, buf_len = 0;
 156     int rv, pkey_id;
 157
 158     md = EVP_MD_CTX_get0_md(ctx);
 159     pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
 160
 161     if (pkey == NULL) {
 162         ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 163         goto err;
 164     }
 165
 166     if (pkey->ameth == NULL) {
 167         EVP_PKEY_CTX *pctx = EVP_MD_CTX_get_pkey_ctx(ctx);
 168         OSSL_PARAM params[2];
 169         unsigned char aid[128];
 170         size_t aid_len = 0;
 171
 172         if (pctx == NULL
 173             || !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
 174             ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 175             goto err;
 176         }
 177
 178         params[0] =
 179             OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
 180                                               aid, sizeof(aid));
 181         params[1] = OSSL_PARAM_construct_end();
 182
 183         if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
 184             goto err;
 185
 186         if ((aid_len = params[0].return_size) == 0) {
 187             ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 188             goto err;
 189         }
 190
 191         if (algor1 != NULL) {
 192             const unsigned char *pp = aid;
 193
 194             if (d2i_X509_ALGOR(&algor1, &pp, aid_len) == NULL) {
 195                 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 196                 goto err;
 197             }
 198         }
 199
 200         if (algor2 != NULL) {
 201             const unsigned char *pp = aid;
 202
 203             if (d2i_X509_ALGOR(&algor2, &pp, aid_len) == NULL) {
 204                 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 205                 goto err;
 206             }
 207         }
 208
 209         rv = 3;
 210     } else if (pkey->ameth->item_sign) {
 211         rv = pkey->ameth->item_sign(ctx, it, data, algor1, algor2, signature);
 212         if (rv == 1)
 213             outl = signature->length;
 214         /*-
 215          * Return value meanings:
 216          * <=0: error.
 217          *   1: method does everything.
 218          *   2: carry on as normal.
 219          *   3: ASN1 method sets algorithm identifiers: just sign.
 220          */
 221         if (rv <= 0)
 222             ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 223         if (rv <= 1)
 224             goto err;
 225     } else {
 226         rv = 2;
 227     }
 228
 229     if (rv == 2) {
 230         if (md == NULL) {
 231             ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
 232             goto err;
 233         }
 234
 235         pkey_id =
 236 #ifndef OPENSSL_NO_SM2
 237             EVP_PKEY_get_id(pkey) == NID_sm2 ? NID_sm2 :
 238 #endif
 239             pkey->ameth->pkey_id;
 240
 241         if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(md), pkey_id)) {
 242             ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 243             goto err;
 244         }
 245
 246         paramtype = pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL ?
 247             V_ASN1_NULL : V_ASN1_UNDEF;
 248         if (algor1 != NULL
 249             && !X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL))
 250             goto err;
 251         if (algor2 != NULL
 252             && !X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL))
 253             goto err;
 254     }
 255
 256     buf_len = ASN1_item_i2d(data, &buf_in, it);
 257     if (buf_len <= 0) {
 258         outl = 0;
 259         ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
 260         goto err;
 261     }
 262     inl = buf_len;
 263     if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
 264         outl = 0;
 265         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 266         goto err;
 267     }
 268     outl = outll;
 269     buf_out = OPENSSL_malloc(outll);
 270     if (buf_in == NULL || buf_out == NULL) {
 271         outl = 0;
 272         goto err;
 273     }
 274
 275     if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
 276         outl = 0;
 277         ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
 278         goto err;
 279     }
 280     ASN1_STRING_set0(signature, buf_out, outl);
 281     buf_out = NULL;
 282     /*
 283      * In the interests of compatibility, I'll make sure that the bit string
 284      * has a 'not-used bits' value of 0
 285      */
 286     ossl_asn1_string_set_bits_left(signature, 0);
 287  err:
 288     OPENSSL_clear_free((char *)buf_in, inl);
 289     OPENSSL_clear_free((char *)buf_out, outll);
 290     return outl;
 291 }