2 * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13 #include <openssl/bn.h>
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.
22 #define BN_SENSITIVE 1
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);
28 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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);
37 static ASN1_PRIMITIVE_FUNCS bignum_pf = {
47 static ASN1_PRIMITIVE_FUNCS cbignum_pf = {
57 ASN1_ITEM_start(BIGNUM)
58 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
61 ASN1_ITEM_start(CBIGNUM)
62 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &cbignum_pf, BN_SENSITIVE, "CBIGNUM"
63 ASN1_ITEM_end(CBIGNUM)
65 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
67 *pval = (ASN1_VALUE *)BN_new();
74 static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
76 *pval = (ASN1_VALUE *)BN_secure_new();
83 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
87 if (it->size & BN_SENSITIVE)
88 BN_clear_free((BIGNUM *)*pval);
90 BN_free((BIGNUM *)*pval);
94 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
101 bn = (BIGNUM *)*pval;
102 /* If MSB set in an octet we need a padding byte */
103 if (BN_num_bits(bn) & 0x7)
112 return pad + BN_num_bytes(bn);
115 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
116 int utype, char *free_cont, const ASN1_ITEM *it)
120 if (*pval == NULL && !bn_new(pval, it))
122 bn = (BIGNUM *)*pval;
123 if (!BN_bin2bn(cont, len, bn)) {
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)
134 bn_secure_new(pval, it);
135 return bn_c2i(pval, cont, len, utype, free_cont, it);
138 static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
139 int indent, const ASN1_PCTX *pctx)
141 if (!BN_print(out, *(BIGNUM **)pval))
143 if (BIO_puts(out, "\n") <= 0)