-/* crypto/bn/bn_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
#include <limits.h>
#include "internal/cryptlib.h"
#include "bn_lcl.h"
-
-const char BN_version[] = "Big Number" OPENSSL_VERSION_PTEXT;
+#include <openssl/opensslconf.h>
/* This stuff appears to be completely unused, so is deprecated */
-#ifndef OPENSSL_NO_DEPRECATED
+#if OPENSSL_API_COMPAT < 0x00908000L
/*-
* For a 32 bit machine
* 2 - 4 == 128
return ((i * BN_BITS2) + BN_num_bits_word(a->d[i]));
}
+static void bn_free_d(BIGNUM *a)
+{
+ if (BN_get_flags(a,BN_FLG_SECURE))
+ OPENSSL_secure_free(a->d);
+ else
+ OPENSSL_free(a->d);
+}
+
+
void BN_clear_free(BIGNUM *a)
{
int i;
bn_check_top(a);
if (a->d != NULL) {
OPENSSL_cleanse(a->d, a->dmax * sizeof(a->d[0]));
- if (!(BN_get_flags(a, BN_FLG_STATIC_DATA)))
- OPENSSL_free(a->d);
+ if (!BN_get_flags(a, BN_FLG_STATIC_DATA))
+ bn_free_d(a);
}
i = BN_get_flags(a, BN_FLG_MALLOCED);
- OPENSSL_cleanse(a, sizeof(BIGNUM));
+ OPENSSL_cleanse(a, sizeof(*a));
if (i)
OPENSSL_free(a);
}
return;
bn_check_top(a);
if (!BN_get_flags(a, BN_FLG_STATIC_DATA))
- OPENSSL_free(a->d);
+ bn_free_d(a);
if (a->flags & BN_FLG_MALLOCED)
OPENSSL_free(a);
else {
-#ifndef OPENSSL_NO_DEPRECATED
+#if OPENSSL_API_COMPAT < 0x00908000L
a->flags |= BN_FLG_FREE;
#endif
a->d = NULL;
}
}
-void BN_init(BIGNUM *a)
+void bn_init(BIGNUM *a)
{
- memset(a, 0, sizeof(*a));
+ static BIGNUM nilbn;
+
+ *a = nilbn;
bn_check_top(a);
}
{
BIGNUM *ret;
- if ((ret = OPENSSL_malloc(sizeof(*ret))) == NULL) {
+ if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
BNerr(BN_F_BN_NEW, ERR_R_MALLOC_FAILURE);
return (NULL);
}
ret->flags = BN_FLG_MALLOCED;
- ret->top = 0;
- ret->neg = 0;
- ret->dmax = 0;
- ret->d = NULL;
bn_check_top(ret);
return (ret);
}
-/* This is used both by bn_expand2() and bn_dup_expand() */
+ BIGNUM *BN_secure_new(void)
+ {
+ BIGNUM *ret = BN_new();
+ if (ret != NULL)
+ ret->flags |= BN_FLG_SECURE;
+ return (ret);
+ }
+
+/* This is used by bn_expand2() */
/* The caller MUST check that words > b->dmax before calling this */
static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
{
BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA);
return (NULL);
}
- a = A = OPENSSL_malloc(sizeof(*a) * words);
+ if (BN_get_flags(b,BN_FLG_SECURE))
+ a = A = OPENSSL_secure_zalloc(words * sizeof(*a));
+ else
+ a = A = OPENSSL_zalloc(words * sizeof(*a));
if (A == NULL) {
BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);
return (NULL);
}
-#ifdef PURIFY
- /*
- * Valgrind complains in BN_consttime_swap because we process the whole
- * array even if it's not initialised yet. This doesn't matter in that
- * function - what's important is constant time operation (we're not
- * actually going to use the data)
- */
- memset(a, 0, sizeof(*a) * words);
-#endif
#if 1
B = b->d;
* The fact that the loop is unrolled
* 4-wise is a tribute to Intel. It's
* the one that doesn't have enough
- * registers to accomodate more data.
+ * registers to accommodate more data.
* I'd unroll it 8-wise otherwise:-)
*
* <appro@fy.chalmers.se>
BN_ULONG *a = bn_expand_internal(b, words);
if (!a)
return NULL;
- OPENSSL_free(b->d);
+ if (b->d) {
+ OPENSSL_cleanse(b->d, b->dmax * sizeof(b->d[0]));
+ bn_free_d(b);
+ }
b->d = a;
b->dmax = words;
}
return NULL;
bn_check_top(a);
- t = BN_new();
+ t = BN_get_flags(a, BN_FLG_SECURE) ? BN_secure_new() : BN_new();
if (t == NULL)
return NULL;
if (!BN_copy(t, a)) {
if (ret == NULL)
return (NULL);
bn_check_top(ret);
- l = 0;
+ /* Skip leading zero's. */
+ for ( ; len > 0 && *s == 0; s++, len--)
+ continue;
n = len;
if (n == 0) {
ret->top = 0;
}
ret->top = i;
ret->neg = 0;
+ l = 0;
while (n--) {
l = (l << 8L) | *(s++);
if (m-- == 0) {
}
/* ignore negative */
-int BN_bn2bin(const BIGNUM *a, unsigned char *to)
+static int bn2binpad(const BIGNUM *a, unsigned char *to, int tolen)
{
- int n, i;
+ int i;
BN_ULONG l;
bn_check_top(a);
- n = i = BN_num_bytes(a);
+ i = BN_num_bytes(a);
+ if (tolen == -1)
+ tolen = i;
+ else if (tolen < i)
+ return -1;
+ /* Add leading zeroes if necessary */
+ if (tolen > i) {
+ memset(to, 0, tolen - i);
+ to += tolen - i;
+ }
while (i--) {
l = a->d[i / BN_BYTES];
*(to++) = (unsigned char)(l >> (8 * (i % BN_BYTES))) & 0xff;
}
- return (n);
+ return tolen;
+}
+
+int BN_bn2binpad(const BIGNUM *a, unsigned char *to, int tolen)
+{
+ if (tolen < 0)
+ return -1;
+ return bn2binpad(a, to, tolen);
+}
+
+int BN_bn2bin(const BIGNUM *a, unsigned char *to)
+{
+ return bn2binpad(a, to, -1);
+}
+
+BIGNUM *BN_lebin2bn(const unsigned char *s, int len, BIGNUM *ret)
+{
+ unsigned int i, m;
+ unsigned int n;
+ BN_ULONG l;
+ BIGNUM *bn = NULL;
+
+ if (ret == NULL)
+ ret = bn = BN_new();
+ if (ret == NULL)
+ return (NULL);
+ bn_check_top(ret);
+ s += len - 1;
+ /* Skip trailing zeroes. */
+ for ( ; len > 0 && *s == 0; s--, len--)
+ continue;
+ n = len;
+ if (n == 0) {
+ ret->top = 0;
+ return ret;
+ }
+ i = ((n - 1) / BN_BYTES) + 1;
+ m = ((n - 1) % (BN_BYTES));
+ if (bn_wexpand(ret, (int)i) == NULL) {
+ BN_free(bn);
+ return NULL;
+ }
+ ret->top = i;
+ ret->neg = 0;
+ l = 0;
+ while (n--) {
+ l = (l << 8L) | *(s--);
+ if (m-- == 0) {
+ ret->d[--i] = l;
+ l = 0;
+ m = BN_BYTES - 1;
+ }
+ }
+ /*
+ * need to call this due to clear byte at top if avoiding having the top
+ * bit set (-ve number)
+ */
+ bn_correct_top(ret);
+ return ret;
+}
+
+int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen)
+{
+ int i;
+ BN_ULONG l;
+ bn_check_top(a);
+ i = BN_num_bytes(a);
+ if (tolen < i)
+ return -1;
+ /* Add trailing zeroes if necessary */
+ if (tolen > i)
+ memset(to + i, 0, tolen - i);
+ to += i - 1;
+ while (i--) {
+ l = a->d[i / BN_BYTES];
+ *(to--) = (unsigned char)(l >> (8 * (i % BN_BYTES))) & 0xff;
+ }
+ return tolen;
}
int BN_ucmp(const BIGNUM *a, const BIGNUM *b)
return BN_mod_mul_montgomery(r, a, &(mont->RR), mont, ctx);
}
-void BN_with_flags(BIGNUM *dest, const BIGNUM *b, int n)
+void BN_with_flags(BIGNUM *dest, const BIGNUM *b, int flags)
{
dest->d = b->d;
dest->top = b->top;
dest->neg = b->neg;
dest->flags = ((dest->flags & BN_FLG_MALLOCED)
| (b->flags & ~BN_FLG_MALLOCED)
- | BN_FLG_STATIC_DATA | n);
+ | BN_FLG_STATIC_DATA | flags);
}
BN_GENCB *BN_GENCB_new(void)
projects / openssl.git / blobdiff