crypto/asn1/a_sign.c

   1 /*
   2  * Copyright 1995-2016 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 "crypto/asn1.h"
  22 #include "crypto/evp.h"
  23
  24 #ifndef NO_ASN1_OLD
  25
  26 int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
  27               ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
  28               const EVP_MD *type)
  29 {
  30     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
  31     unsigned char *p, *buf_in = NULL, *buf_out = NULL;
  32     int i, inl = 0, outl = 0;
  33     size_t inll = 0, outll = 0;
  34     X509_ALGOR *a;
  35
  36     if (ctx == NULL) {
  37         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
  38         goto err;
  39     }
  40     for (i = 0; i < 2; i++) {
  41         if (i == 0)
  42             a = algor1;
  43         else
  44             a = algor2;
  45         if (a == NULL)
  46             continue;
  47         if (type->pkey_type == NID_dsaWithSHA1) {
  48             /*
  49              * special case: RFC 2459 tells us to omit 'parameters' with
  50              * id-dsa-with-sha1
  51              */
  52             ASN1_TYPE_free(a->parameter);
  53             a->parameter = NULL;
  54         } else if ((a->parameter == NULL) ||
  55                    (a->parameter->type != V_ASN1_NULL)) {
  56             ASN1_TYPE_free(a->parameter);
  57             if ((a->parameter = ASN1_TYPE_new()) == NULL)
  58                 goto err;
  59             a->parameter->type = V_ASN1_NULL;
  60         }
  61         ASN1_OBJECT_free(a->algorithm);
  62         a->algorithm = OBJ_nid2obj(type->pkey_type);
  63         if (a->algorithm == NULL) {
  64             ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);
  65             goto err;
  66         }
  67         if (a->algorithm->length == 0) {
  68             ASN1err(ASN1_F_ASN1_SIGN,
  69                     ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
  70             goto err;
  71         }
  72     }
  73     inl = i2d(data, NULL);
  74     if (inl <= 0) {
  75         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_INTERNAL_ERROR);
  76         goto err;
  77     }
  78     inll = (size_t)inl;
  79     buf_in = OPENSSL_malloc(inll);
  80     outll = outl = EVP_PKEY_size(pkey);
  81     buf_out = OPENSSL_malloc(outll);
  82     if (buf_in == NULL || buf_out == NULL) {
  83         outl = 0;
  84         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
  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         ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
  96         goto err;
  97     }
  98     OPENSSL_free(signature->data);
  99     signature->data = buf_out;
 100     buf_out = NULL;
 101     signature->length = outl;
 102     /*
 103      * In the interests of compatibility, I'll make sure that the bit string
 104      * has a 'not-used bits' value of 0
 105      */
 106     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 107     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 108  err:
 109     EVP_MD_CTX_free(ctx);
 110     OPENSSL_clear_free((char *)buf_in, inll);
 111     OPENSSL_clear_free((char *)buf_out, outll);
 112     return outl;
 113 }
 114
 115 #endif
 116
 117 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
 118                    X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
 119                    EVP_PKEY *pkey, const EVP_MD *type)
 120 {
 121     int rv;
 122     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
 123
 124     if (ctx == NULL) {
 125         ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE);
 126         return 0;
 127     }
 128     if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) {
 129         EVP_MD_CTX_free(ctx);
 130         return 0;
 131     }
 132
 133     rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx);
 134
 135     EVP_MD_CTX_free(ctx);
 136     return rv;
 137 }
 138
 139 int ASN1_item_sign_ctx(const ASN1_ITEM *it,
 140                        X509_ALGOR *algor1, X509_ALGOR *algor2,
 141                        ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
 142 {
 143     const EVP_MD *type;
 144     EVP_PKEY *pkey;
 145     unsigned char *buf_in = NULL, *buf_out = NULL;
 146     size_t inl = 0, outl = 0, outll = 0;
 147     int signid, paramtype, buf_len = 0;
 148     int rv, pkey_id;
 149
 150     type = EVP_MD_CTX_md(ctx);
 151     pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
 152
 153     if (pkey == NULL) {
 154         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
 155         goto err;
 156     }
 157
 158     if (pkey->ameth == NULL) {
 159         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 160         goto err;
 161     }
 162
 163     if (pkey->ameth->item_sign) {
 164         rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
 165         if (rv == 1)
 166             outl = signature->length;
 167         /*-
 168          * Return value meanings:
 169          * <=0: error.
 170          *   1: method does everything.
 171          *   2: carry on as normal.
 172          *   3: ASN1 method sets algorithm identifiers: just sign.
 173          */
 174         if (rv <= 0)
 175             ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
 176         if (rv <= 1)
 177             goto err;
 178     } else {
 179         rv = 2;
 180     }
 181
 182     if (rv == 2) {
 183         if (type == NULL) {
 184             ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
 185             goto err;
 186         }
 187
 188         pkey_id =
 189 #ifndef OPENSSL_NO_SM2
 190             EVP_PKEY_id(pkey) == NID_sm2 ? NID_sm2 :
 191 #endif
 192         pkey->ameth->pkey_id;
 193
 194         if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(type), pkey_id)) {
 195             ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
 196                     ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 197             goto err;
 198         }
 199
 200         if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
 201             paramtype = V_ASN1_NULL;
 202         else
 203             paramtype = V_ASN1_UNDEF;
 204
 205         if (algor1)
 206             X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
 207         if (algor2)
 208             X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
 209
 210     }
 211
 212     buf_len = ASN1_item_i2d(asn, &buf_in, it);
 213     if (buf_len <= 0) {
 214         outl = 0;
 215         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_INTERNAL_ERROR);
 216         goto err;
 217     }
 218     inl = buf_len;
 219     outll = outl = EVP_PKEY_size(pkey);
 220     buf_out = OPENSSL_malloc(outll);
 221     if (buf_in == NULL || buf_out == NULL) {
 222         outl = 0;
 223         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
 224         goto err;
 225     }
 226
 227     if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
 228         outl = 0;
 229         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
 230         goto err;
 231     }
 232     OPENSSL_free(signature->data);
 233     signature->data = buf_out;
 234     buf_out = NULL;
 235     signature->length = outl;
 236     /*
 237      * In the interests of compatibility, I'll make sure that the bit string
 238      * has a 'not-used bits' value of 0
 239      */
 240     signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 241     signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 242  err:
 243     OPENSSL_clear_free((char *)buf_in, inl);
 244     OPENSSL_clear_free((char *)buf_out, outll);
 245     return outl;
 246 }