crypto/asn1/evp_asn1.c

   1 /*
   2  * Copyright 1995-2020 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/asn1.h>
  13 #include <openssl/asn1t.h>
  14 #include "crypto/asn1.h"
  15
  16 int ASN1_TYPE_set_octetstring(ASN1_TYPE *a, unsigned char *data, int len)
  17 {
  18     ASN1_STRING *os;
  19
  20     if ((os = ASN1_OCTET_STRING_new()) == NULL)
  21         return 0;
  22     if (!ASN1_OCTET_STRING_set(os, data, len)) {
  23         ASN1_OCTET_STRING_free(os);
  24         return 0;
  25     }
  26     ASN1_TYPE_set(a, V_ASN1_OCTET_STRING, os);
  27     return 1;
  28 }
  29
  30 /* int max_len:  for returned value    */
  31 int ASN1_TYPE_get_octetstring(const ASN1_TYPE *a, unsigned char *data, int max_len)
  32 {
  33     int ret, num;
  34     const unsigned char *p;
  35
  36     if ((a->type != V_ASN1_OCTET_STRING) || (a->value.octet_string == NULL)) {
  37         ERR_raise(ERR_LIB_ASN1, ASN1_R_DATA_IS_WRONG);
  38         return -1;
  39     }
  40     p = ASN1_STRING_get0_data(a->value.octet_string);
  41     ret = ASN1_STRING_length(a->value.octet_string);
  42     if (ret < max_len)
  43         num = ret;
  44     else
  45         num = max_len;
  46     memcpy(data, p, num);
  47     return ret;
  48 }
  49
  50 static ossl_inline void asn1_type_init_oct(ASN1_OCTET_STRING *oct,
  51                                            unsigned char *data, int len)
  52 {
  53     oct->data = data;
  54     oct->type = V_ASN1_OCTET_STRING;
  55     oct->length = len;
  56     oct->flags = 0;
  57 }
  58
  59 static int asn1_type_get_int_oct(ASN1_OCTET_STRING *oct, int32_t anum,
  60                                  long *num, unsigned char *data, int max_len)
  61 {
  62     int ret = ASN1_STRING_length(oct), n;
  63
  64     if (num != NULL)
  65         *num = anum;
  66
  67     if (max_len > ret)
  68         n = ret;
  69     else
  70         n = max_len;
  71
  72     if (data != NULL)
  73         memcpy(data, ASN1_STRING_get0_data(oct), n);
  74
  75     return ret;
  76 }
  77
  78 typedef struct {
  79     int32_t num;
  80     ASN1_OCTET_STRING *oct;
  81 } asn1_int_oct;
  82
  83 ASN1_SEQUENCE(asn1_int_oct) = {
  84         ASN1_EMBED(asn1_int_oct, num, INT32),
  85         ASN1_SIMPLE(asn1_int_oct, oct, ASN1_OCTET_STRING)
  86 } static_ASN1_SEQUENCE_END(asn1_int_oct)
  87
  88 DECLARE_ASN1_ITEM(asn1_int_oct)
  89
  90 int ASN1_TYPE_set_int_octetstring(ASN1_TYPE *a, long num, unsigned char *data,
  91                                   int len)
  92 {
  93     asn1_int_oct atmp;
  94     ASN1_OCTET_STRING oct;
  95
  96     atmp.num = num;
  97     atmp.oct = &oct;
  98     asn1_type_init_oct(&oct, data, len);
  99
 100     if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(asn1_int_oct), &atmp, &a))
 101         return 1;
 102     return 0;
 103 }
 104
 105 int ASN1_TYPE_get_int_octetstring(const ASN1_TYPE *a, long *num,
 106                                   unsigned char *data, int max_len)
 107 {
 108     asn1_int_oct *atmp = NULL;
 109     int ret = -1;
 110
 111     if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL)) {
 112         goto err;
 113     }
 114
 115     atmp = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(asn1_int_oct), a);
 116
 117     if (atmp == NULL)
 118         goto err;
 119
 120     ret = asn1_type_get_int_oct(atmp->oct, atmp->num, num, data, max_len);
 121
 122     if (ret == -1) {
 123  err:
 124         ERR_raise(ERR_LIB_ASN1, ASN1_R_DATA_IS_WRONG);
 125     }
 126     M_ASN1_free_of(atmp, asn1_int_oct);
 127     return ret;
 128 }
 129
 130 typedef struct {
 131     ASN1_OCTET_STRING *oct;
 132     int32_t num;
 133 } asn1_oct_int;
 134
 135 /*
 136  * Defined in RFC 5084 -
 137  * Section 2. "Content-Authenticated Encryption Algorithms"
 138  */
 139 ASN1_SEQUENCE(asn1_oct_int) = {
 140         ASN1_SIMPLE(asn1_oct_int, oct, ASN1_OCTET_STRING),
 141         ASN1_EMBED(asn1_oct_int, num, INT32)
 142 } static_ASN1_SEQUENCE_END(asn1_oct_int)
 143
 144 DECLARE_ASN1_ITEM(asn1_oct_int)
 145
 146 int ossl_asn1_type_set_octetstring_int(ASN1_TYPE *a, long num,
 147                                        unsigned char *data, int len)
 148 {
 149     asn1_oct_int atmp;
 150     ASN1_OCTET_STRING oct;
 151
 152     atmp.num = num;
 153     atmp.oct = &oct;
 154     asn1_type_init_oct(&oct, data, len);
 155
 156     if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(asn1_oct_int), &atmp, &a))
 157         return 1;
 158     return 0;
 159 }
 160
 161 int ossl_asn1_type_get_octetstring_int(const ASN1_TYPE *a, long *num,
 162                                        unsigned char *data, int max_len)
 163 {
 164     asn1_oct_int *atmp = NULL;
 165     int ret = -1;
 166
 167     if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL))
 168         goto err;
 169
 170     atmp = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(asn1_oct_int), a);
 171
 172     if (atmp == NULL)
 173         goto err;
 174
 175     ret = asn1_type_get_int_oct(atmp->oct, atmp->num, num, data, max_len);
 176
 177     if (ret == -1) {
 178  err:
 179         ERR_raise(ERR_LIB_ASN1, ASN1_R_DATA_IS_WRONG);
 180     }
 181     M_ASN1_free_of(atmp, asn1_oct_int);
 182     return ret;
 183 }