#endif
#include <assert.h>
+#include <limits.h>
#include <stdio.h>
#include "cryptlib.h"
#include "bn_lcl.h"
{
if (mult >= 0)
{
- if (mult > (sizeof(int)*8)-1)
+ if (mult > (int)(sizeof(int)*8)-1)
mult=sizeof(int)*8-1;
bn_limit_bits=mult;
bn_limit_num=1<<mult;
}
if (high >= 0)
{
- if (high > (sizeof(int)*8)-1)
+ if (high > (int)(sizeof(int)*8)-1)
high=sizeof(int)*8-1;
bn_limit_bits_high=high;
bn_limit_num_high=1<<high;
}
if (low >= 0)
{
- if (low > (sizeof(int)*8)-1)
+ if (low > (int)(sizeof(int)*8)-1)
low=sizeof(int)*8-1;
bn_limit_bits_low=low;
bn_limit_num_low=1<<low;
}
if (mont >= 0)
{
- if (mont > (sizeof(int)*8)-1)
+ if (mont > (int)(sizeof(int)*8)-1)
mont=sizeof(int)*8-1;
bn_limit_bits_mont=mont;
bn_limit_num_mont=1<<mont;
else return(0);
}
-BIGNUM *BN_value_one(void)
+const BIGNUM *BN_value_one(void)
{
static BN_ULONG data_one=1L;
static BIGNUM const_one={&data_one,1,1,0};
if (a == NULL) return;
if (a->d != NULL)
{
- memset(a->d,0,a->dmax*sizeof(a->d[0]));
+ OPENSSL_cleanse(a->d,a->dmax*sizeof(a->d[0]));
if (!(BN_get_flags(a,BN_FLG_STATIC_DATA)))
OPENSSL_free(a->d);
}
i=BN_get_flags(a,BN_FLG_MALLOCED);
- memset(a,0,sizeof(BIGNUM));
+ OPENSSL_cleanse(a,sizeof(BIGNUM));
if (i)
OPENSSL_free(a);
}
const BN_ULONG *B;
int i;
+ if (words > (INT_MAX/(4*BN_BITS2)))
+ {
+ BNerr(BN_F_BN_EXPAND_INTERNAL,BN_R_BIGNUM_TOO_LONG);
+ return NULL;
+ }
+
bn_check_top(b);
if (BN_get_flags(b,BN_FLG_STATIC_DATA))
{
}
}
- /* Now need to zero any data between b->top and b->max */
-
- A= &(a[b->top]);
- for (i=(words - b->top)>>3; i>0; i--,A+=8)
- {
- A[0]=0; A[1]=0; A[2]=0; A[3]=0;
- A[4]=0; A[5]=0; A[6]=0; A[7]=0;
- }
- for (i=(words - b->top)&7; i>0; i--,A++)
- A[0]=0;
#else
memset(A,0,sizeof(BN_ULONG)*(words+1));
memcpy(A,b->d,sizeof(b->d[0])*b->top);
{
BIGNUM *r = NULL;
+ /* This function does not work if
+ * words <= b->dmax && top < words
+ * because BN_dup() does not preserve 'dmax'!
+ * (But bn_dup_expand() is not used anywhere yet.)
+ */
+
if (words > b->dmax)
{
BN_ULONG *a = bn_expand_internal(b, words);
}
/* This is an internal function that should not be used in applications.
- * It ensures that 'b' has enough room for a 'words' word number number.
+ * It ensures that 'b' has enough room for a 'words' word number
+ * and initialises any unused part of b->d with leading zeros.
* It is mostly used by the various BIGNUM routines. If there is an error,
* NULL is returned. If not, 'b' is returned. */
BIGNUM *bn_expand2(BIGNUM *b, int words)
{
+ BN_ULONG *A;
+ int i;
+
if (words > b->dmax)
{
BN_ULONG *a = bn_expand_internal(b, words);
else
b = NULL;
}
+
+ /* NB: bn_wexpand() calls this only if the BIGNUM really has to grow */
+ if ((b != NULL) && (b->top < b->dmax))
+ {
+ A = &(b->d[b->top]);
+ for (i=(b->dmax - b->top)>>3; i>0; i--,A+=8)
+ {
+ A[0]=0; A[1]=0; A[2]=0; A[3]=0;
+ A[4]=0; A[5]=0; A[6]=0; A[7]=0;
+ }
+ for (i=(b->dmax - b->top)&7; i>0; i--,A++)
+ A[0]=0;
+ assert(A == &(b->d[b->dmax]));
+ }
return b;
}
return(a);
}
+BIGNUM *BN_ncopy(BIGNUM *a, const BIGNUM *b, size_t n)
+ {
+ int i, min;
+ BN_ULONG *A;
+ const BN_ULONG *B;
+
+ bn_check_top(b);
+
+ if (a == b)
+ return a;
+
+ min = (b->top < (int)n)? b->top: (int)n;
+
+ if (!min)
+ {
+ BN_zero(a);
+ return a;
+ }
+
+ if (bn_wexpand(a, min) == NULL)
+ return NULL;
+
+ A=a->d;
+ B=b->d;
+ for (i=min>>2; i>0; i--, A+=4, B+=4)
+ {
+ BN_ULONG a0,a1,a2,a3;
+ a0=B[0]; a1=B[1]; a2=B[2]; a3=B[3];
+ A[0]=a0; A[1]=a1; A[2]=a2; A[3]=a3;
+ }
+ switch (min&3)
+ {
+ case 3: A[2]=B[2];
+ case 2: A[1]=B[1];
+ case 1: A[0]=B[0];
+ case 0: ;
+ }
+ a->top = min;
+
+ a->neg = b->neg;
+ bn_fix_top(a);
+
+ return(a);
+ }
+
void BN_swap(BIGNUM *a, BIGNUM *b)
{
int flags_old_a, flags_old_b;
BN_ULONG ret=0;
n=BN_num_bytes(a);
- if (n > sizeof(BN_ULONG))
+ if (n > (int)sizeof(BN_ULONG))
return(BN_MASK2);
for (i=a->top-1; i>=0; i--)
{
int BN_set_word(BIGNUM *a, BN_ULONG w)
{
int i,n;
- if (bn_expand(a,sizeof(BN_ULONG)*8) == NULL) return(0);
+ if (bn_expand(a,(int)sizeof(BN_ULONG)*8) == NULL) return(0);
n=sizeof(BN_ULONG)/BN_BYTES;
a->neg=0;
return(1);
}
-/* ignore negative */
BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret)
{
unsigned int i,m;
return(NULL);
i=((n-1)/BN_BYTES)+1;
m=((n-1)%(BN_BYTES));
- ret->top=i-1;
+ ret->top=i;
+ ret->neg=0;
while (n-- > 0)
{
l=(l<<8L)| *(s++);
return(0);
}
+/* Here follows a specialised variants of bn_cmp_words(). It has the
+ property of performing the operation on arrays of different sizes.
+ The sizes of those arrays is expressed through cl, which is the
+ common length ( basicall, min(len(a),len(b)) ), and dl, which is the
+ delta between the two lengths, calculated as len(a)-len(b).
+ All lengths are the number of BN_ULONGs... */
+
+int bn_cmp_part_words(const BN_ULONG *a, const BN_ULONG *b,
+ int cl, int dl)
+ {
+ int n,i;
+ n = cl-1;
+
+ if (dl < 0)
+ {
+ for (i=dl; i<0; i++)
+ {
+ if (b[n-i] != 0)
+ return -1; /* a < b */
+ }
+ }
+ if (dl > 0)
+ {
+ for (i=dl; i>0; i--)
+ {
+ if (a[n+i] != 0)
+ return 1; /* a > b */
+ }
+ }
+ return bn_cmp_words(a,b,cl);
+ }
projects / openssl.git / blobdiff