1 | /*
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2 | * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 | #include "internal/cryptlib.h"
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12 | #include <openssl/asn1t.h>
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13 | #include <openssl/bn.h>
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14 |
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15 | /*
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16 | * Custom primitive type for long handling. This converts between an
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17 | * ASN1_INTEGER and a long directly.
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18 | */
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19 |
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20 | static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
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21 | static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
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22 |
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23 | static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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24 | const ASN1_ITEM *it);
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25 | static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
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26 | int utype, char *free_cont, const ASN1_ITEM *it);
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27 | static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
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28 | int indent, const ASN1_PCTX *pctx);
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29 |
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30 | static ASN1_PRIMITIVE_FUNCS long_pf = {
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31 | NULL, 0,
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32 | long_new,
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33 | long_free,
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34 | long_free, /* Clear should set to initial value */
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35 | long_c2i,
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36 | long_i2c,
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37 | long_print
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38 | };
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39 |
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40 | ASN1_ITEM_start(LONG)
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41 | ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
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42 | ASN1_ITEM_end(LONG)
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43 |
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44 | ASN1_ITEM_start(ZLONG)
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45 | ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
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46 | ASN1_ITEM_end(ZLONG)
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47 |
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48 | static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
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49 | {
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50 | *(long *)pval = it->size;
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51 | return 1;
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52 | }
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53 |
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54 | static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
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55 | {
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56 | *(long *)pval = it->size;
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57 | }
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58 |
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59 | static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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60 | const ASN1_ITEM *it)
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61 | {
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62 | long ltmp;
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63 | unsigned long utmp;
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64 | int clen, pad, i;
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65 | /* this exists to bypass broken gcc optimization */
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66 | char *cp = (char *)pval;
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67 |
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68 | /* use memcpy, because we may not be long aligned */
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69 | memcpy(<mp, cp, sizeof(long));
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70 |
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71 | if (ltmp == it->size)
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72 | return -1;
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73 | /*
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74 | * Convert the long to positive: we subtract one if negative so we can
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75 | * cleanly handle the padding if only the MSB of the leading octet is
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76 | * set.
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77 | */
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78 | if (ltmp < 0)
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79 | utmp = 0 - (unsigned long)ltmp - 1;
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80 | else
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81 | utmp = ltmp;
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82 | clen = BN_num_bits_word(utmp);
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83 | /* If MSB of leading octet set we need to pad */
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84 | if (!(clen & 0x7))
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85 | pad = 1;
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86 | else
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87 | pad = 0;
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88 |
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89 | /* Convert number of bits to number of octets */
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90 | clen = (clen + 7) >> 3;
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91 |
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92 | if (cont) {
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93 | if (pad)
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94 | *cont++ = (ltmp < 0) ? 0xff : 0;
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95 | for (i = clen - 1; i >= 0; i--) {
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96 | cont[i] = (unsigned char)(utmp & 0xff);
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97 | if (ltmp < 0)
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98 | cont[i] ^= 0xff;
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99 | utmp >>= 8;
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100 | }
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101 | }
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102 | return clen + pad;
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103 | }
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104 |
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105 | static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
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106 | int utype, char *free_cont, const ASN1_ITEM *it)
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107 | {
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108 | int neg, i;
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109 | long ltmp;
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110 | unsigned long utmp = 0;
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111 | char *cp = (char *)pval;
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112 | if (len > (int)sizeof(long)) {
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113 | ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
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114 | return 0;
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115 | }
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116 | /* Is it negative? */
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117 | if (len && (cont[0] & 0x80))
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118 | neg = 1;
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119 | else
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120 | neg = 0;
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121 | utmp = 0;
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122 | for (i = 0; i < len; i++) {
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123 | utmp <<= 8;
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124 | if (neg)
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125 | utmp |= cont[i] ^ 0xff;
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126 | else
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127 | utmp |= cont[i];
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128 | }
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129 | ltmp = (long)utmp;
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130 | if (neg) {
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131 | ltmp = -ltmp;
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132 | ltmp--;
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133 | }
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134 | if (ltmp == it->size) {
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135 | ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
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136 | return 0;
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137 | }
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138 | memcpy(cp, <mp, sizeof(long));
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139 | return 1;
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140 | }
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141 |
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142 | static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
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143 | int indent, const ASN1_PCTX *pctx)
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144 | {
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145 | return BIO_printf(out, "%ld\n", *(long *)pval);
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146 | }
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