-/* crypto/rc4/rc4_enc.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:
* 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
* 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
#include <openssl/rc4.h>
#include "rc4_locl.h"
-/* RC4 as implemented from a posting from
+/*-
+ * RC4 as implemented from a posting from
* Newsgroups: sci.crypt
* From: sterndark@netcom.com (David Sterndark)
* Subject: RC4 Algorithm revealed.
* Date: Wed, 14 Sep 1994 06:35:31 GMT
*/
-void RC4(RC4_KEY *key, unsigned long len, unsigned char *indata,
- unsigned char *outdata)
- {
- register RC4_INT *d;
- register RC4_INT x,y,tx,ty;
- int i;
-
- x=key->x;
- y=key->y;
- d=key->data;
+void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
+ unsigned char *outdata)
+{
+ register RC4_INT *d;
+ register RC4_INT x, y, tx, ty;
+ size_t i;
-#if defined(RC4_CHUNK) && (defined(L_ENDIAN) || defined(B_ENDIAN))
- /*
- * The original reason for implementing this(*) was the fact that
- * pre-21164a Alpha CPUs don't have byte load/store instructions
- * and e.g. a byte store has to be done with 64-bit load, shift,
- * and, or and finally 64-bit store. Peaking data and operating
- * at natural word size made it possible to reduce amount of
- * instructions as well as to perform early read-ahead without
- * suffering from RAW (read-after-write) hazard. This resulted
- * in >40%(**) performance improvement (on 21064 box with gcc).
- * But it's not only Alpha users who win here:-) Thanks to the
- * early-n-wide read-ahead this implementation also exhibits
- * >40% speed-up on SPARC and almost 20% on MIPS.
- *
- * (*) "this" means code which recognizes the case when input
- * and output pointers appear to be aligned at natural CPU
- * word boundary.
- * (**) i.e. according to 'apps/openssl speed rc4' benchmark,
- * crypto/rc4/rc4speed.c exhibits almost 70% speed-up.
- *
- * <appro@fy.chalmers.se>
- */
+ x = key->x;
+ y = key->y;
+ d = key->data;
-#define RC4_STEP ( \
- x=(x+1) &0xff, \
- tx=d[x], \
- y=(tx+y)&0xff, \
- ty=d[y], \
- d[y]=tx, \
- d[x]=ty, \
- (RC4_CHUNK)d[(tx+ty)&0xff]\
- )
-
-#if defined(L_ENDIAN)
-# define SHFT(c) ((c)*8)
-# define MASK(i) (((RC4_CHUNK)-1)>>((sizeof(RC4_CHUNK)-(i))<<3))
-# define SHINC 8
-#elif defined(B_ENDIAN)
-# define SHFT(c) ((sizeof(RC4_CHUNK)-(c)-1)*8)
-# define MASK(i) (((RC4_CHUNK)-1)<<((sizeof(RC4_CHUNK)-(i))<<3))
-# define SHINC -8
-#else
-# error "L_ENDIAN or B_ENDIAN *must* be defined!"
-#endif
-
- if ( ( ((unsigned long)indata & (sizeof(RC4_CHUNK)-1)) |
- ((unsigned long)outdata & (sizeof(RC4_CHUNK)-1)) ) == 0
- ) {
- RC4_CHUNK ichunk,cipher;
-
- for (;len&-sizeof(RC4_CHUNK);len-=sizeof(RC4_CHUNK)) {
- ichunk = *(RC4_CHUNK *)indata;
- cipher = RC4_STEP<<SHFT(0);
- cipher |= RC4_STEP<<SHFT(1);
- cipher |= RC4_STEP<<SHFT(2);
- cipher |= RC4_STEP<<SHFT(3);
-#ifdef RC4_CHUNK_IS_64_BIT
- cipher |= RC4_STEP<<SHFT(4);
- cipher |= RC4_STEP<<SHFT(5);
- cipher |= RC4_STEP<<SHFT(6);
- cipher |= RC4_STEP<<SHFT(7);
-#endif
- *(RC4_CHUNK *)outdata = cipher^ichunk;
- indata += sizeof(RC4_CHUNK);
- outdata += sizeof(RC4_CHUNK);
- }
- if (len) {
- RC4_CHUNK mask,ochunk;
-
- ichunk = *(RC4_CHUNK *)indata;
- ochunk = *(RC4_CHUNK *)outdata;
- cipher = 0;
- i = SHFT(0);
- mask = MASK(len);
- switch (len) {
-#ifdef RC4_CHUNK_IS_64_BIT
- case 7: cipher = RC4_STEP<<SHFT(0), i+=SHINC;
- case 6: cipher |= RC4_STEP<<i, i+=SHINC;
- case 5: cipher |= RC4_STEP<<i, i+=SHINC;
- case 4: cipher |= RC4_STEP<<i, i+=SHINC;
- case 3: cipher |= RC4_STEP<<i, i+=SHINC;
-#else
- case 3: cipher = RC4_STEP<<SHFT(0), i+=SHINC;
-#endif
- case 2: cipher |= RC4_STEP<<i, i+=SHINC;
- case 1: cipher |= RC4_STEP<<i, i+=SHINC;
- case 0: ; /* it's never the case, but it
- has to be here for ultrix? */
- }
- ochunk &= ~mask;
- ochunk |= (cipher^ichunk) & mask;
- *(RC4_CHUNK *)outdata = ochunk;
- }
- }
- else
-#endif
- {
#define LOOP(in,out) \
- x=((x+1)&0xff); \
- tx=d[x]; \
- y=(tx+y)&0xff; \
- d[x]=ty=d[y]; \
- d[y]=tx; \
- (out) = d[(tx+ty)&0xff]^ (in);
-
-#ifndef RC4_INDEX
-#define RC4_LOOP(a,b,i) LOOP(*((a)++),*((b)++))
-#else
-#define RC4_LOOP(a,b,i) LOOP(a[i],b[i])
-#endif
+ x=((x+1)&0xff); \
+ tx=d[x]; \
+ y=(tx+y)&0xff; \
+ d[x]=ty=d[y]; \
+ d[y]=tx; \
+ (out) = d[(tx+ty)&0xff]^ (in);
- i=(int)(len>>3L);
- if (i)
- {
- for (;;)
- {
- RC4_LOOP(indata,outdata,0);
- RC4_LOOP(indata,outdata,1);
- RC4_LOOP(indata,outdata,2);
- RC4_LOOP(indata,outdata,3);
- RC4_LOOP(indata,outdata,4);
- RC4_LOOP(indata,outdata,5);
- RC4_LOOP(indata,outdata,6);
- RC4_LOOP(indata,outdata,7);
-#ifdef RC4_INDEX
- indata+=8;
- outdata+=8;
-#endif
- if (--i == 0) break;
- }
- }
- i=(int)len&0x07;
- if (i)
- {
- for (;;)
- {
- RC4_LOOP(indata,outdata,0); if (--i == 0) break;
- RC4_LOOP(indata,outdata,1); if (--i == 0) break;
- RC4_LOOP(indata,outdata,2); if (--i == 0) break;
- RC4_LOOP(indata,outdata,3); if (--i == 0) break;
- RC4_LOOP(indata,outdata,4); if (--i == 0) break;
- RC4_LOOP(indata,outdata,5); if (--i == 0) break;
- RC4_LOOP(indata,outdata,6); if (--i == 0) break;
- }
- }
- }
- key->x=x;
- key->y=y;
- }
+ i = len >> 3;
+ if (i) {
+ for (;;) {
+ LOOP(indata[0], outdata[0]);
+ LOOP(indata[1], outdata[1]);
+ LOOP(indata[2], outdata[2]);
+ LOOP(indata[3], outdata[3]);
+ LOOP(indata[4], outdata[4]);
+ LOOP(indata[5], outdata[5]);
+ LOOP(indata[6], outdata[6]);
+ LOOP(indata[7], outdata[7]);
+ indata += 8;
+ outdata += 8;
+ if (--i == 0)
+ break;
+ }
+ }
+ i = len & 0x07;
+ if (i) {
+ for (;;) {
+ LOOP(indata[0], outdata[0]);
+ if (--i == 0)
+ break;
+ LOOP(indata[1], outdata[1]);
+ if (--i == 0)
+ break;
+ LOOP(indata[2], outdata[2]);
+ if (--i == 0)
+ break;
+ LOOP(indata[3], outdata[3]);
+ if (--i == 0)
+ break;
+ LOOP(indata[4], outdata[4]);
+ if (--i == 0)
+ break;
+ LOOP(indata[5], outdata[5]);
+ if (--i == 0)
+ break;
+ LOOP(indata[6], outdata[6]);
+ if (--i == 0)
+ break;
+ }
+ }
+ key->x = x;
+ key->y = y;
+}
projects / openssl.git / blobdiff