[331] | 1 | /*
|
---|
| 2 | * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
|
---|
| 3 | *
|
---|
| 4 | * Licensed under the OpenSSL license (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/asn1t.h>
|
---|
| 13 | #include <openssl/bn.h>
|
---|
| 14 |
|
---|
| 15 | /*
|
---|
| 16 | * Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER
|
---|
| 17 | * as a BIGNUM directly. Currently it ignores the sign which isn't a problem
|
---|
| 18 | * since all BIGNUMs used are non negative and anything that looks negative
|
---|
| 19 | * is normally due to an encoding error.
|
---|
| 20 | */
|
---|
| 21 |
|
---|
| 22 | #define BN_SENSITIVE 1
|
---|
| 23 |
|
---|
| 24 | static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
|
---|
| 25 | static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
|
---|
| 26 | static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
|
---|
| 27 |
|
---|
| 28 | static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
|
---|
| 29 | const ASN1_ITEM *it);
|
---|
| 30 | static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
---|
| 31 | int utype, char *free_cont, const ASN1_ITEM *it);
|
---|
| 32 | static int bn_secure_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
---|
| 33 | int utype, char *free_cont, const ASN1_ITEM *it);
|
---|
| 34 | static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
|
---|
| 35 | int indent, const ASN1_PCTX *pctx);
|
---|
| 36 |
|
---|
| 37 | static ASN1_PRIMITIVE_FUNCS bignum_pf = {
|
---|
| 38 | NULL, 0,
|
---|
| 39 | bn_new,
|
---|
| 40 | bn_free,
|
---|
| 41 | 0,
|
---|
| 42 | bn_c2i,
|
---|
| 43 | bn_i2c,
|
---|
| 44 | bn_print
|
---|
| 45 | };
|
---|
| 46 |
|
---|
| 47 | static ASN1_PRIMITIVE_FUNCS cbignum_pf = {
|
---|
| 48 | NULL, 0,
|
---|
| 49 | bn_secure_new,
|
---|
| 50 | bn_free,
|
---|
| 51 | 0,
|
---|
| 52 | bn_secure_c2i,
|
---|
| 53 | bn_i2c,
|
---|
| 54 | bn_print
|
---|
| 55 | };
|
---|
| 56 |
|
---|
| 57 | ASN1_ITEM_start(BIGNUM)
|
---|
| 58 | ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
|
---|
| 59 | ASN1_ITEM_end(BIGNUM)
|
---|
| 60 |
|
---|
| 61 | ASN1_ITEM_start(CBIGNUM)
|
---|
| 62 | ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &cbignum_pf, BN_SENSITIVE, "CBIGNUM"
|
---|
| 63 | ASN1_ITEM_end(CBIGNUM)
|
---|
| 64 |
|
---|
| 65 | static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
|
---|
| 66 | {
|
---|
| 67 | *pval = (ASN1_VALUE *)BN_new();
|
---|
| 68 | if (*pval != NULL)
|
---|
| 69 | return 1;
|
---|
| 70 | else
|
---|
| 71 | return 0;
|
---|
| 72 | }
|
---|
| 73 |
|
---|
| 74 | static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
|
---|
| 75 | {
|
---|
| 76 | *pval = (ASN1_VALUE *)BN_secure_new();
|
---|
| 77 | if (*pval != NULL)
|
---|
| 78 | return 1;
|
---|
| 79 | else
|
---|
| 80 | return 0;
|
---|
| 81 | }
|
---|
| 82 |
|
---|
| 83 | static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
|
---|
| 84 | {
|
---|
| 85 | if (!*pval)
|
---|
| 86 | return;
|
---|
| 87 | if (it->size & BN_SENSITIVE)
|
---|
| 88 | BN_clear_free((BIGNUM *)*pval);
|
---|
| 89 | else
|
---|
| 90 | BN_free((BIGNUM *)*pval);
|
---|
| 91 | *pval = NULL;
|
---|
| 92 | }
|
---|
| 93 |
|
---|
| 94 | static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
|
---|
| 95 | const ASN1_ITEM *it)
|
---|
| 96 | {
|
---|
| 97 | BIGNUM *bn;
|
---|
| 98 | int pad;
|
---|
| 99 | if (!*pval)
|
---|
| 100 | return -1;
|
---|
| 101 | bn = (BIGNUM *)*pval;
|
---|
| 102 | /* If MSB set in an octet we need a padding byte */
|
---|
| 103 | if (BN_num_bits(bn) & 0x7)
|
---|
| 104 | pad = 0;
|
---|
| 105 | else
|
---|
| 106 | pad = 1;
|
---|
| 107 | if (cont) {
|
---|
| 108 | if (pad)
|
---|
| 109 | *cont++ = 0;
|
---|
| 110 | BN_bn2bin(bn, cont);
|
---|
| 111 | }
|
---|
| 112 | return pad + BN_num_bytes(bn);
|
---|
| 113 | }
|
---|
| 114 |
|
---|
| 115 | static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
---|
| 116 | int utype, char *free_cont, const ASN1_ITEM *it)
|
---|
| 117 | {
|
---|
| 118 | BIGNUM *bn;
|
---|
| 119 |
|
---|
| 120 | if (*pval == NULL && !bn_new(pval, it))
|
---|
| 121 | return 0;
|
---|
| 122 | bn = (BIGNUM *)*pval;
|
---|
| 123 | if (!BN_bin2bn(cont, len, bn)) {
|
---|
| 124 | bn_free(pval, it);
|
---|
| 125 | return 0;
|
---|
| 126 | }
|
---|
| 127 | return 1;
|
---|
| 128 | }
|
---|
| 129 |
|
---|
| 130 | static int bn_secure_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
---|
| 131 | int utype, char *free_cont, const ASN1_ITEM *it)
|
---|
| 132 | {
|
---|
| 133 | if (!*pval)
|
---|
| 134 | bn_secure_new(pval, it);
|
---|
| 135 | return bn_c2i(pval, cont, len, utype, free_cont, it);
|
---|
| 136 | }
|
---|
| 137 |
|
---|
| 138 | static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
|
---|
| 139 | int indent, const ASN1_PCTX *pctx)
|
---|
| 140 | {
|
---|
| 141 | if (!BN_print(out, *(BIGNUM **)pval))
|
---|
| 142 | return 0;
|
---|
| 143 | if (BIO_puts(out, "\n") <= 0)
|
---|
| 144 | return 0;
|
---|
| 145 | return 1;
|
---|
| 146 | }
|
---|