misc.c

00001 /* misc.c
00002  *
00003  * Copyright (C) 2006-2013 wolfSSL Inc.
00004  *
00005  * This file is part of CyaSSL.
00006  *
00007  * CyaSSL is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * CyaSSL is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
00020  */
00021 
00022 #ifdef HAVE_CONFIG_H
00023     #include <config.h>
00024 #endif
00025 
00026 #include <cyassl/ctaocrypt/settings.h>
00027 
00028 #include <cyassl/ctaocrypt/misc.h>
00029 
00030 /* inlining these functions is a huge speed increase and a small size decrease, 
00031    because the functions are smaller than function call setup/cleanup, e.g.,
00032    md5 benchmark is twice as fast with inline.  If you don't want it, then
00033    define NO_INLINE and compile this file into cyassl, otherwise it's used as
00034    a source header
00035  */
00036 
00037 #ifdef NO_INLINE
00038     #define STATIC
00039 #else
00040     #define STATIC static
00041 #endif
00042 
00043 
00044 #ifdef INTEL_INTRINSICS
00045 
00046     #include <stdlib.h>      /* get intrinsic definitions */
00047 
00048     #pragma intrinsic(_lrotl, _lrotr)
00049 
00050     STATIC INLINE word32 rotlFixed(word32 x, word32 y)
00051     {
00052         return y ? _lrotl(x, y) : x;
00053     }
00054 
00055     STATIC INLINE word32 rotrFixed(word32 x, word32 y)
00056     {
00057         return y ? _lrotr(x, y) : x;
00058     }
00059 
00060 #else /* generic */
00061 
00062     STATIC INLINE word32 rotlFixed(word32 x, word32 y)
00063     {
00064         return (x << y) | (x >> (sizeof(y) * 8 - y));
00065     }   
00066 
00067 
00068     STATIC INLINE word32 rotrFixed(word32 x, word32 y)
00069     {
00070         return (x >> y) | (x << (sizeof(y) * 8 - y));
00071     }
00072 
00073 #endif
00074 
00075 
00076 STATIC INLINE word32 ByteReverseWord32(word32 value)
00077 {
00078 #ifdef PPC_INTRINSICS
00079     /* PPC: load reverse indexed instruction */
00080     return (word32)__lwbrx(&value,0);
00081 #elif defined(KEIL_INTRINSICS)
00082     return (word32)__rev(value);
00083 #elif defined(FAST_ROTATE)
00084     /* 5 instructions with rotate instruction, 9 without */
00085     return (rotrFixed(value, 8U) & 0xff00ff00) |
00086            (rotlFixed(value, 8U) & 0x00ff00ff);
00087 #else
00088     /* 6 instructions with rotate instruction, 8 without */
00089     value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
00090     return rotlFixed(value, 16U);
00091 #endif
00092 }
00093 
00094 
00095 STATIC INLINE void ByteReverseWords(word32* out, const word32* in,
00096                                     word32 byteCount)
00097 {
00098     word32 count = byteCount/(word32)sizeof(word32), i;
00099 
00100     for (i = 0; i < count; i++)
00101         out[i] = ByteReverseWord32(in[i]);
00102 
00103 }
00104 
00105 
00106 #ifdef WORD64_AVAILABLE
00107 
00108 
00109 STATIC INLINE word64 rotlFixed64(word64 x, word64 y)
00110 {
00111     return (x << y) | (x >> (sizeof(y) * 8 - y));
00112 }  
00113 
00114 
00115 STATIC INLINE word64 rotrFixed64(word64 x, word64 y)
00116 {
00117     return (x >> y) | (x << (sizeof(y) * 8 - y));
00118 }
00119 
00120 
00121 STATIC INLINE word64 ByteReverseWord64(word64 value)
00122 {
00123 #ifdef CTAOCRYPT_SLOW_WORD64
00124     return (word64)(ByteReverseWord32((word32)value)) << 32 | 
00125                     ByteReverseWord32((word32)(value>>32));
00126 #else
00127     value = ((value & W64LIT(0xFF00FF00FF00FF00)) >> 8) |
00128             ((value & W64LIT(0x00FF00FF00FF00FF)) << 8);
00129     value = ((value & W64LIT(0xFFFF0000FFFF0000)) >> 16) |
00130             ((value & W64LIT(0x0000FFFF0000FFFF)) << 16);
00131     return rotlFixed64(value, 32U);
00132 #endif
00133 }
00134 
00135 
00136 STATIC INLINE void ByteReverseWords64(word64* out, const word64* in,
00137                                       word32 byteCount)
00138 {
00139     word32 count = byteCount/(word32)sizeof(word64), i;
00140 
00141     for (i = 0; i < count; i++)
00142         out[i] = ByteReverseWord64(in[i]);
00143 
00144 }
00145 
00146 #endif /* WORD64_AVAILABLE */
00147 
00148 
00149 STATIC INLINE void XorWords(word* r, const word* a, word32 n)
00150 {
00151     word32 i;
00152 
00153     for (i = 0; i < n; i++) r[i] ^= a[i];
00154 }
00155 
00156 
00157 STATIC INLINE void xorbuf(void* buf, const void* mask, word32 count)
00158 {
00159     if (((word)buf | (word)mask | count) % CYASSL_WORD_SIZE == 0)
00160         XorWords( (word*)buf, (const word*)mask, count / CYASSL_WORD_SIZE);
00161     else {
00162         word32 i;
00163         byte*       b = (byte*)buf;
00164         const byte* m = (const byte*)mask;
00165 
00166         for (i = 0; i < count; i++) b[i] ^= m[i];
00167     }
00168 }
00169 #undef STATIC
00170