X-Git-Url: https://git.openssl.org/gitweb/?a=blobdiff_plain;f=crypto%2Fbn%2Fbn_word.c;h=718777b5b83986352cfee2604fcd6ffc716d3b19;hb=985c3146967633707f7c165df82bb0fd8f279758;hp=d83032c66ca01438e8f35d0b21d4d19d4e429eaf;hpb=4d6e1e4f29de455b5e644ea9cae5d5f5a2dbef33;p=openssl.git

diff --git a/crypto/bn/bn_word.c b/crypto/bn/bn_word.c
index d83032c66c..718777b5b8 100644
--- a/crypto/bn/bn_word.c
+++ b/crypto/bn/bn_word.c
@@ -1,25 +1,24 @@
-/* crypto/bn/bn_word.c */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
- * 
+ *
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
  * apply to all code found in this distribution, be it the RC4, RSA,
  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  * included with this distribution is covered by the same copyright terms
  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- * 
+ *
  * Copyright remains Eric Young's, and as such any Copyright notices in
  * the code are not to be removed.
  * If this package is used in a product, Eric Young should be given attribution
  * as the author of the parts of the library used.
  * This can be in the form of a textual message at program startup or
  * in documentation (online or textual) provided with the package.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -34,10 +33,10 @@
  *     Eric Young (eay@cryptsoft.com)"
  *    The word 'cryptographic' can be left out if the rouines from the library
  *    being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from 
+ * 4. If you include any Windows specific code (or a derivative thereof) from
  *    the apps directory (application code) you must include an acknowledgement:
  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -49,206 +48,178 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- * 
+ *
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
 
-#include <stdio.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
 #include "bn_lcl.h"
 
 BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w)
-	{
+{
 #ifndef BN_LLONG
-	BN_ULONG ret=0;
+    BN_ULONG ret = 0;
 #else
-	BN_ULLONG ret=0;
+    BN_ULLONG ret = 0;
 #endif
-	int i;
+    int i;
 
-	if (w == 0)
-		return (BN_ULONG)-1;
+    if (w == 0)
+        return (BN_ULONG)-1;
 
-	bn_check_top(a);
-	w&=BN_MASK2;
-	for (i=a->top-1; i>=0; i--)
-		{
+    bn_check_top(a);
+    w &= BN_MASK2;
+    for (i = a->top - 1; i >= 0; i--) {
 #ifndef BN_LLONG
-		ret=((ret<<BN_BITS4)|((a->d[i]>>BN_BITS4)&BN_MASK2l))%w;
-		ret=((ret<<BN_BITS4)|(a->d[i]&BN_MASK2l))%w;
+        ret = ((ret << BN_BITS4) | ((a->d[i] >> BN_BITS4) & BN_MASK2l)) % w;
+        ret = ((ret << BN_BITS4) | (a->d[i] & BN_MASK2l)) % w;
 #else
-		ret=(BN_ULLONG)(((ret<<(BN_ULLONG)BN_BITS2)|a->d[i])%
-			(BN_ULLONG)w);
+        ret = (BN_ULLONG) (((ret << (BN_ULLONG) BN_BITS2) | a->d[i]) %
+                           (BN_ULLONG) w);
 #endif
-		}
-	return((BN_ULONG)ret);
-	}
+    }
+    return ((BN_ULONG)ret);
+}
 
 BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w)
-	{
-	BN_ULONG ret = 0;
-	int i, j;
-
-	bn_check_top(a);
-	w &= BN_MASK2;
-
-	if (!w)
-		/* actually this an error (division by zero) */
-		return (BN_ULONG)-1;
-	if (a->top == 0)
-		return 0;
-
-	/* normalize input (so bn_div_words doesn't complain) */
-	j = BN_BITS2 - BN_num_bits_word(w);
-	w <<= j;
-	if (!BN_lshift(a, a, j))
-		return (BN_ULONG)-1;
-
-	for (i=a->top-1; i>=0; i--)
-		{
-		BN_ULONG l,d;
-		
-		l=a->d[i];
-		d=bn_div_words(ret,l,w);
-		ret=(l-((d*w)&BN_MASK2))&BN_MASK2;
-		a->d[i]=d;
-		}
-	if ((a->top > 0) && (a->d[a->top-1] == 0))
-		a->top--;
-	ret >>= j;
-	bn_check_top(a);
-	return(ret);
-	}
+{
+    BN_ULONG ret = 0;
+    int i, j;
+
+    bn_check_top(a);
+    w &= BN_MASK2;
+
+    if (!w)
+        /* actually this an error (division by zero) */
+        return (BN_ULONG)-1;
+    if (a->top == 0)
+        return 0;
+
+    /* normalize input (so bn_div_words doesn't complain) */
+    j = BN_BITS2 - BN_num_bits_word(w);
+    w <<= j;
+    if (!BN_lshift(a, a, j))
+        return (BN_ULONG)-1;
+
+    for (i = a->top - 1; i >= 0; i--) {
+        BN_ULONG l, d;
+
+        l = a->d[i];
+        d = bn_div_words(ret, l, w);
+        ret = (l - ((d * w) & BN_MASK2)) & BN_MASK2;
+        a->d[i] = d;
+    }
+    if ((a->top > 0) && (a->d[a->top - 1] == 0))
+        a->top--;
+    ret >>= j;
+    bn_check_top(a);
+    return (ret);
+}
 
 int BN_add_word(BIGNUM *a, BN_ULONG w)
-	{
-	BN_ULONG l;
-	int i;
-
-	bn_check_top(a);
-	w &= BN_MASK2;
-
-	/* degenerate case: w is zero */
-	if (!w) return 1;
-	/* degenerate case: a is zero */
-	if(BN_is_zero(a)) return BN_set_word(a, w);
-	/* handle 'a' when negative */
-	if (a->neg)
-		{
-		a->neg=0;
-		i=BN_sub_word(a,w);
-		if (!BN_is_zero(a))
-			a->neg=!(a->neg);
-		return(i);
-		}
-	/* Only expand (and risk failing) if it's possibly necessary */
-	if (((BN_ULONG)(a->d[a->top - 1] + 1) == 0) &&
-			(bn_wexpand(a,a->top+1) == NULL))
-		return(0);
-	i=0;
-	for (;;)
-		{
-		if (i >= a->top)
-			l=w;
-		else
-			l=(a->d[i]+w)&BN_MASK2;
-		a->d[i]=l;
-		if (w > l)
-			w=1;
-		else
-			break;
-		i++;
-		}
-	if (i >= a->top)
-		a->top++;
-	bn_check_top(a);
-	return(1);
-	}
-
-int BN_add_signed_word(BIGNUM *a, BN_LONG w)
-	{
-	if(w < 0)
-		return 0;
-	return BN_add_word(a, (BN_ULONG)w);
-	}
+{
+    BN_ULONG l;
+    int i;
+
+    bn_check_top(a);
+    w &= BN_MASK2;
+
+    /* degenerate case: w is zero */
+    if (!w)
+        return 1;
+    /* degenerate case: a is zero */
+    if (BN_is_zero(a))
+        return BN_set_word(a, w);
+    /* handle 'a' when negative */
+    if (a->neg) {
+        a->neg = 0;
+        i = BN_sub_word(a, w);
+        if (!BN_is_zero(a))
+            a->neg = !(a->neg);
+        return (i);
+    }
+    for (i = 0; w != 0 && i < a->top; i++) {
+        a->d[i] = l = (a->d[i] + w) & BN_MASK2;
+        w = (w > l) ? 1 : 0;
+    }
+    if (w && i == a->top) {
+        if (bn_wexpand(a, a->top + 1) == NULL)
+            return 0;
+        a->top++;
+        a->d[i] = w;
+    }
+    bn_check_top(a);
+    return (1);
+}
 
 int BN_sub_word(BIGNUM *a, BN_ULONG w)
-	{
-	int i;
-
-	bn_check_top(a);
-	w &= BN_MASK2;
-
-	/* degenerate case: w is zero */
-	if (!w) return 1;
-	/* degenerate case: a is zero */
-	if(BN_is_zero(a))
-		{
-		i = BN_set_word(a,w);
-		if (i != 0)
-			BN_set_negative(a, 1);
-		return i;
-		}
-	/* handle 'a' when negative */
-	if (a->neg)
-		{
-		a->neg=0;
-		i=BN_add_word(a,w);
-		a->neg=1;
-		return(i);
-		}
-
-	if ((a->top == 1) && (a->d[0] < w))
-		{
-		a->d[0]=w-a->d[0];
-		a->neg=1;
-		return(1);
-		}
-	i=0;
-	for (;;)
-		{
-		if (a->d[i] >= w)
-			{
-			a->d[i]-=w;
-			break;
-			}
-		else
-			{
-			a->d[i]=(a->d[i]-w)&BN_MASK2;
-			i++;
-			w=1;
-			}
-		}
-	if ((a->d[i] == 0) && (i == (a->top-1)))
-		a->top--;
-	bn_check_top(a);
-	return(1);
-	}
+{
+    int i;
+
+    bn_check_top(a);
+    w &= BN_MASK2;
+
+    /* degenerate case: w is zero */
+    if (!w)
+        return 1;
+    /* degenerate case: a is zero */
+    if (BN_is_zero(a)) {
+        i = BN_set_word(a, w);
+        if (i != 0)
+            BN_set_negative(a, 1);
+        return i;
+    }
+    /* handle 'a' when negative */
+    if (a->neg) {
+        a->neg = 0;
+        i = BN_add_word(a, w);
+        a->neg = 1;
+        return (i);
+    }
+
+    if ((a->top == 1) && (a->d[0] < w)) {
+        a->d[0] = w - a->d[0];
+        a->neg = 1;
+        return (1);
+    }
+    i = 0;
+    for (;;) {
+        if (a->d[i] >= w) {
+            a->d[i] -= w;
+            break;
+        } else {
+            a->d[i] = (a->d[i] - w) & BN_MASK2;
+            i++;
+            w = 1;
+        }
+    }
+    if ((a->d[i] == 0) && (i == (a->top - 1)))
+        a->top--;
+    bn_check_top(a);
+    return (1);
+}
 
 int BN_mul_word(BIGNUM *a, BN_ULONG w)
-	{
-	BN_ULONG ll;
-
-	bn_check_top(a);
-	w&=BN_MASK2;
-	if (a->top)
-		{
-		if (w == 0)
-			BN_zero(a);
-		else
-			{
-			ll=bn_mul_words(a->d,a->d,a->top,w);
-			if (ll)
-				{
-				if (bn_wexpand(a,a->top+1) == NULL) return(0);
-				a->d[a->top++]=ll;
-				}
-			}
-		}
-	bn_check_top(a);
-	return(1);
-	}
-
+{
+    BN_ULONG ll;
+
+    bn_check_top(a);
+    w &= BN_MASK2;
+    if (a->top) {
+        if (w == 0)
+            BN_zero(a);
+        else {
+            ll = bn_mul_words(a->d, a->d, a->top, w);
+            if (ll) {
+                if (bn_wexpand(a, a->top + 1) == NULL)
+                    return (0);
+                a->d[a->top++] = ll;
+            }
+        }
+    }
+    bn_check_top(a);
+    return (1);
+}