Import of old SSLeay release: SSLeay 0.8.1b

1 files changed, 489 insertions, 0 deletions

diff --git a/crypto/lhash/lhash.c b/crypto/lhash/lhash.c
new file mode 100644
index 0000000000..3e61248946
--- /dev/null
+++ b/crypto/lhash/lhash.c
@@ -0,0 +1,489 @@
+/* crypto/lhash/lhash.c */
+/* Copyright (C) 1995-1997 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:
+ * 1. Redistributions of source code must retain the copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     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 
+ *    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
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * 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.]
+ */
+
+char *lh_version="lhash part of SSLeay 0.8.1b 29-Jun-1998";
+
+/* Code for dynamic hash table routines
+ * Author - Eric Young v 2.0
+ *
+ * 2.0 eay - Fixed a bug that occured when using lh_delete
+ *	     from inside lh_doall().  As entries were deleted,
+ *	     the 'table' was 'contract()ed', making some entries
+ *	     jump from the end of the table to the start, there by
+ *	     skiping the lh_doall() processing. eay - 4/12/95
+ *
+ * 1.9 eay - Fixed a memory leak in lh_free, the LHASH_NODEs
+ *	     were not being free()ed. 21/11/95
+ *
+ * 1.8 eay - Put the stats routines into a separate file, lh_stats.c
+ *	     19/09/95
+ *
+ * 1.7 eay - Removed the fputs() for realloc failures - the code
+ *           should silently tolerate them.  I have also fixed things
+ *           lint complained about 04/05/95
+ *
+ * 1.6 eay - Fixed an invalid pointers in contract/expand 27/07/92
+ *
+ * 1.5 eay - Fixed a misuse of realloc in expand 02/03/1992
+ *
+ * 1.4 eay - Fixed lh_doall so the function can call lh_delete 28/05/91
+ *
+ * 1.3 eay - Fixed a few lint problems 19/3/1991
+ *
+ * 1.2 eay - Fixed lh_doall problem 13/3/1991
+ *
+ * 1.1 eay - Added lh_doall
+ *
+ * 1.0 eay - First version
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "lhash.h"
+
+#undef MIN_NODES 
+#define MIN_NODES	16
+#define UP_LOAD		(2*LH_LOAD_MULT) /* load times 256  (default 2) */
+#define DOWN_LOAD	(LH_LOAD_MULT)   /* load times 256  (default 1) */
+
+#ifndef NOPROTO
+
+#define P_CP	char *
+#define P_CPP	char *,char *
+static void expand(LHASH *lh);
+static void contract(LHASH *lh);
+static LHASH_NODE **getrn(LHASH *lh, char *data, unsigned long *rhash);
+
+#else
+
+#define	P_CP
+#define P_CPP
+static void expand();
+static void contract();
+static LHASH_NODE **getrn();
+
+#endif
+
+LHASH *lh_new(h, c)
+unsigned long (*h)();
+int (*c)();
+	{
+	LHASH *ret;
+	int i;
+
+	if ((ret=(LHASH *)malloc(sizeof(LHASH))) == NULL)
+		goto err0;
+	if ((ret->b=(LHASH_NODE **)malloc(sizeof(LHASH_NODE *)*MIN_NODES)) == NULL)
+		goto err1;
+	for (i=0; i<MIN_NODES; i++)
+		ret->b[i]=NULL;
+	ret->comp=((c == NULL)?(int (*)())strcmp:c);
+	ret->hash=((h == NULL)?(unsigned long (*)())lh_strhash:h);
+	ret->num_nodes=MIN_NODES/2;
+	ret->num_alloc_nodes=MIN_NODES;
+	ret->p=0;
+	ret->pmax=MIN_NODES/2;
+	ret->up_load=UP_LOAD;
+	ret->down_load=DOWN_LOAD;
+	ret->num_items=0;
+
+	ret->num_expands=0;
+	ret->num_expand_reallocs=0;
+	ret->num_contracts=0;
+	ret->num_contract_reallocs=0;
+	ret->num_hash_calls=0;
+	ret->num_comp_calls=0;
+	ret->num_insert=0;
+	ret->num_replace=0;
+	ret->num_delete=0;
+	ret->num_no_delete=0;
+	ret->num_retrieve=0;
+	ret->num_retrieve_miss=0;
+	ret->num_hash_comps=0;
+
+	return(ret);
+err1:
+	free((char *)ret);
+err0:
+	return(NULL);
+	}
+
+void lh_free(lh)
+LHASH *lh;
+	{
+	unsigned int i;
+	LHASH_NODE *n,*nn;
+
+	for (i=0; i<lh->num_nodes; i++)
+		{
+		n=lh->b[i];
+		while (n != NULL)
+			{
+			nn=n->next;
+			free(n);
+			n=nn;
+			}
+		}
+	free((char *)lh->b);
+	free((char *)lh);
+	}
+
+char *lh_insert(lh, data)
+LHASH *lh;
+char *data;
+	{
+	unsigned long hash;
+	LHASH_NODE *nn,**rn;
+	char *ret;
+
+	if (lh->up_load <= (lh->num_items*LH_LOAD_MULT/lh->num_nodes))
+		expand(lh);
+
+	rn=getrn(lh,data,&hash);
+
+	if (*rn == NULL)
+		{
+		if ((nn=(LHASH_NODE *)malloc(sizeof(LHASH_NODE))) == NULL)
+			return(NULL);
+		nn->data=data;
+		nn->next=NULL;
+#ifndef NO_HASH_COMP
+		nn->hash=hash;
+#endif
+		*rn=nn;
+		ret=NULL;
+		lh->num_insert++;
+		lh->num_items++;
+		}
+	else /* replace same key */
+		{
+		ret= (*rn)->data;
+		(*rn)->data=data;
+		lh->num_replace++;
+		}
+	return(ret);
+	}
+
+char *lh_delete(lh, data)
+LHASH *lh;
+char *data;
+	{
+	unsigned long hash;
+	LHASH_NODE *nn,**rn;
+	char *ret;
+
+	rn=getrn(lh,data,&hash);
+
+	if (*rn == NULL)
+		{
+		lh->num_no_delete++;
+		return(NULL);
+		}
+	else
+		{
+		nn= *rn;
+		*rn=nn->next;
+		ret=nn->data;
+		free((char *)nn);
+		lh->num_delete++;
+		}
+
+	lh->num_items--;
+	if ((lh->num_nodes > MIN_NODES) &&
+		(lh->down_load >= (lh->num_items*LH_LOAD_MULT/lh->num_nodes)))
+		contract(lh);
+
+	return(ret);
+	}
+
+char *lh_retrieve(lh, data)
+LHASH *lh;
+char *data;
+	{
+	unsigned long hash;
+	LHASH_NODE **rn;
+	char *ret;
+
+	rn=getrn(lh,data,&hash);
+
+	if (*rn == NULL)
+		{
+		lh->num_retrieve_miss++;
+		return(NULL);
+		}
+	else
+		{
+		ret= (*rn)->data;
+		lh->num_retrieve++;
+		}
+	return(ret);
+	}
+
+void lh_doall(lh, func)
+LHASH *lh;
+void (*func)();
+	{
+	lh_doall_arg(lh,func,NULL);
+	}
+
+void lh_doall_arg(lh, func, arg)
+LHASH *lh;
+void (*func)();
+char *arg;
+	{
+	int i;
+	LHASH_NODE *a,*n;
+
+	/* reverse the order so we search from 'top to bottom'
+	 * We were having memory leaks otherwise */
+	for (i=lh->num_nodes-1; i>=0; i--)
+		{
+		a=lh->b[i];
+		while (a != NULL)
+			{
+			/* 28/05/91 - eay - n added so items can be deleted
+			 * via lh_doall */
+			n=a->next;
+			func(a->data,arg);
+			a=n;
+			}
+		}
+	}
+
+static void expand(lh)
+LHASH *lh;
+	{
+	LHASH_NODE **n,**n1,**n2,*np;
+	unsigned int p,i,j;
+	unsigned long hash,nni;
+
+	lh->num_nodes++;
+	lh->num_expands++;
+	p=(int)lh->p++;
+	n1= &(lh->b[p]);
+	n2= &(lh->b[p+(int)lh->pmax]);
+	*n2=NULL;        /* 27/07/92 - eay - undefined pointer bug */
+	nni=lh->num_alloc_nodes;
+	
+	for (np= *n1; np != NULL; )
+		{
+#ifndef NO_HASH_COMP
+		hash=np->hash;
+#else
+		hash=(*(lh->hash))(np->data);
+		lh->num_hash_calls++;
+#endif
+		if ((hash%nni) != p)
+			{ /* move it */
+			*n1= (*n1)->next;
+			np->next= *n2;
+			*n2=np;
+			}
+		else
+			n1= &((*n1)->next);
+		np= *n1;
+		}
+
+	if ((lh->p) >= lh->pmax)
+		{
+		j=(int)lh->num_alloc_nodes*2;
+		n=(LHASH_NODE **)realloc((char *)lh->b,
+			(unsigned int)sizeof(LHASH_NODE *)*j);
+		if (n == NULL)
+			{
+/*			fputs("realloc error in lhash",stderr); */
+			lh->p=0;
+			return;
+			}
+		/* else */
+		for (i=(int)lh->num_alloc_nodes; i<j; i++)/* 26/02/92 eay */
+			n[i]=NULL;			  /* 02/03/92 eay */
+		lh->pmax=lh->num_alloc_nodes;
+		lh->num_alloc_nodes=j;
+		lh->num_expand_reallocs++;
+		lh->p=0;
+		lh->b=n;
+		}
+	}
+
+static void contract(lh)
+LHASH *lh;
+	{
+	LHASH_NODE **n,*n1,*np;
+
+	np=lh->b[lh->p+lh->pmax-1];
+	lh->b[lh->p+lh->pmax-1]=NULL; /* 24/07-92 - eay - weird but :-( */
+	if (lh->p == 0)
+		{
+		n=(LHASH_NODE **)realloc((char *)lh->b,
+			(unsigned int)(sizeof(LHASH_NODE *)*lh->pmax));
+		if (n == NULL)
+			{
+/*			fputs("realloc error in lhash",stderr); */
+			return;
+			}
+		lh->num_contract_reallocs++;
+		lh->num_alloc_nodes/=2;
+		lh->pmax/=2;
+		lh->p=lh->pmax-1;
+		lh->b=n;
+		}
+	else
+		lh->p--;
+
+	lh->num_nodes--;
+	lh->num_contracts++;
+
+	n1=lh->b[(int)lh->p];
+	if (n1 == NULL)
+		lh->b[(int)lh->p]=np;
+	else
+		{
+		while (n1->next != NULL)
+			n1=n1->next;
+		n1->next=np;
+		}
+	}
+
+static LHASH_NODE **getrn(lh, data, rhash)
+LHASH *lh;
+char *data;
+unsigned long *rhash;
+	{
+	LHASH_NODE **ret,*n1;
+	unsigned long hash,nn;
+	int (*cf)();
+
+	hash=(*(lh->hash))(data);
+	lh->num_hash_calls++;
+	*rhash=hash;
+
+	nn=hash%lh->pmax;
+	if (nn < lh->p)
+		nn=hash%lh->num_alloc_nodes;
+
+	cf=lh->comp;
+	ret= &(lh->b[(int)nn]);
+	for (n1= *ret; n1 != NULL; n1=n1->next)
+		{
+#ifndef NO_HASH_COMP
+		lh->num_hash_comps++;
+		if (n1->hash != hash)
+			{
+			ret= &(n1->next);
+			continue;
+			}
+#endif
+		lh->num_comp_calls++;
+		if ((*cf)(n1->data,data) == 0)
+			break;
+		ret= &(n1->next);
+		}
+	return(ret);
+	}
+
+/*
+static unsigned long lh_strhash(str)
+char *str;
+	{
+	int i,l;
+	unsigned long ret=0;
+	unsigned short *s;
+
+	if (str == NULL) return(0);
+	l=(strlen(str)+1)/2;
+	s=(unsigned short *)str;
+	for (i=0; i<l; i++)
+		ret^=(s[i]<<(i&0x0f));
+	return(ret);
+	} */
+
+/* The following hash seems to work very well on normal text strings
+ * no collisions on /usr/dict/words and it distributes on %2^n quite
+ * well, not as good as MD5, but still good.
+ */
+unsigned long lh_strhash(c)
+char *c;
+	{
+	unsigned long ret=0;
+	long n;
+	unsigned long v;
+	int r;
+
+	if ((c == NULL) || (*c == '\0'))
+		return(ret);
+/*
+	unsigned char b[16];
+	MD5(c,strlen(c),b);
+	return(b[0]|(b[1]<<8)|(b[2]<<16)|(b[3]<<24)); 
+*/
+
+	n=0x100;
+	while (*c)
+		{
+		v=n|(*c);
+		n+=0x100;
+		r= (int)((v>>2)^v)&0x0f;
+		ret=(ret<<r)|(ret>>(32-r));
+		ret&=0xFFFFFFFFL;
+		ret^=v*v;
+		c++;
+		}
+	return((ret>>16)^ret);
+	}
+