diff options
Diffstat (limited to 'src/Common/GfMul.c')
| -rw-r--r-- | src/Common/GfMul.c | 1536 |
1 files changed, 768 insertions, 768 deletions
diff --git a/src/Common/GfMul.c b/src/Common/GfMul.c index e933e56b..9cd74a89 100644 --- a/src/Common/GfMul.c +++ b/src/Common/GfMul.c @@ -1,768 +1,768 @@ -/*
- ---------------------------------------------------------------------------
- Copyright (c) 2003, Dr Brian Gladman, Worcester, UK. All rights reserved.
-
- LICENSE TERMS
-
- The free distribution and use of this software is allowed (with or without
- changes) provided that:
-
- 1. source code distributions include the above copyright notice, this
- list of conditions and the following disclaimer;
-
- 2. binary distributions include the above copyright notice, this list
- of conditions and the following disclaimer in their documentation;
-
- 3. the name of the copyright holder is not used to endorse products
- built using this software without specific written permission.
-
- DISCLAIMER
-
- This software is provided 'as is' with no explicit or implied warranties
- in respect of its properties, including, but not limited to, correctness
- and/or fitness for purpose.
- ---------------------------------------------------------------------------
- Issue Date: 31/01/2004
-
- My thanks to John Viega and David McGrew for their support in developing
- this code and to David for testing it on a big-endain system.
-*/
-
-/*
- ---------------------------------------------------------------------------
- Portions Copyright (c) 2005 TrueCrypt Developers Association
-
- Changes:
-
- - Added multiplication in the finite field GF(2^128) optimized for
- cases involving a 64-bit operand.
-
- - Added multiplication in the finite field GF(2^64).
-
- - Added MSB-first mode.
-
- - Added basic test algorithms.
-
- - Removed GCM.
- ---------------------------------------------------------------------------
-*/
-
-#include <memory.h>
-#include <stdlib.h>
-#include "GfMul.h"
-#include "Tcdefs.h"
-#include "Common/Endian.h"
-
-/* BUFFER_ALIGN32 or BUFFER_ALIGN64 must be defined at this point to */
-/* enable faster operation by taking advantage of memory aligned values */
-/* NOTE: the BUFFER_ALIGN64 option has not been tested extensively */
-
-#define BUFFER_ALIGN32
-#define UNROLL_LOOPS /* define to unroll some loops */
-#define IN_LINES /* define to use inline functions */
- /* in place of macros */
-
-#define mode(x) GM_##x
-
-#if defined(__cplusplus)
-extern "C"
-{
-#endif
-
-typedef unsigned __int32 mode(32t);
-typedef uint64 mode(64t);
-
-#define BRG_LITTLE_ENDIAN 1234 /* byte 0 is least significant (i386) */
-#define BRG_BIG_ENDIAN 4321 /* byte 0 is most significant (mc68k) */
-
-#if BYTE_ORDER == LITTLE_ENDIAN
-# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
-#endif
-
-#if BYTE_ORDER == BIG_ENDIAN
-# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
-#endif
-
-#ifdef _MSC_VER
-#pragma intrinsic(memcpy)
-#define in_line __inline
-#else
-#define in_line
-#endif
-
-#if 0 && defined(_MSC_VER)
-#define rotl32 _lrotl
-#define rotr32 _lrotr
-#else
-#define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
-#define rotr32(x,n) (((x) >> n) | ((x) << (32 - n)))
-#endif
-
-#if !defined(bswap_32)
-#define bswap_32(x) ((rotr32((x), 24) & 0x00ff00ff) | (rotr32((x), 8) & 0xff00ff00))
-#endif
-
-#if (PLATFORM_BYTE_ORDER == BRG_LITTLE_ENDIAN)
-#define SWAP_BYTES
-#else
-#undef SWAP_BYTES
-#endif
-
-#if defined(SWAP_BYTES)
-
-#if defined ( IN_LINES )
-
-in_line void bsw_32(void * p, unsigned int n)
-{ unsigned int i = n;
- while(i--)
- ((mode(32t)*)p)[i] = bswap_32(((mode(32t)*)p)[i]);
-}
-
-#else
-
-#define bsw_32(p,n) \
- { int _i = (n); while(_i--) ((mode(32t)*)p)[_i] = bswap_32(((mode(32t)*)p)[_i]); }
-
-#endif
-
-#else
-#define bsw_32(p,n)
-#endif
-
-/* These values are used to detect long word alignment in order */
-/* to speed up some GCM buffer operations. This facility may */
-/* not work on some machines */
-
-#define lp08(x) ((unsigned char*)(x))
-#define lp32(x) ((mode(32t)*)(x))
-#define lp64(x) ((mode(64t)*)(x))
-
-#define A32_MASK 3
-#define A64_MASK 7
-#define aligned32(x) (!(((mode(32t))(x)) & A32_MASK))
-#define aligned64(x) (!(((mode(32t))(x)) & A64_MASK))
-
-#if defined( BUFFER_ALIGN32 )
-
-#define ADR_MASK A32_MASK
-#define aligned aligned32
-#define lp lp32
-#define lp_inc 4
-
-#if defined( IN_LINES )
-
-in_line void move_block_aligned( void *p, const void *q)
-{
- lp32(p)[0] = lp32(q)[0], lp32(p)[1] = lp32(q)[1],
- lp32(p)[2] = lp32(q)[2], lp32(p)[3] = lp32(q)[3];
-}
-
-in_line void move_block_aligned64( void *p, const void *q)
-{
- lp32(p)[0] = lp32(q)[0], lp32(p)[1] = lp32(q)[1];
-}
-
-in_line void xor_block_aligned( void *p, const void *q)
-{
- lp32(p)[0] ^= lp32(q)[0], lp32(p)[1] ^= lp32(q)[1],
- lp32(p)[2] ^= lp32(q)[2], lp32(p)[3] ^= lp32(q)[3];
-}
-
-in_line void xor_block_aligned64( void *p, const void *q)
-{
- lp32(p)[0] ^= lp32(q)[0], lp32(p)[1] ^= lp32(q)[1];
-}
-
-#else
-
-#define move_block_aligned(p,q) \
- lp32(p)[0] = lp32(q)[0], lp32(p)[1] = lp32(q)[1], \
- lp32(p)[2] = lp32(q)[2], lp32(p)[3] = lp32(q)[3]
-
-#define xor_block_aligned(p,q) \
- lp32(p)[0] ^= lp32(q)[0], lp32(p)[1] ^= lp32(q)[1], \
- lp32(p)[2] ^= lp32(q)[2], lp32(p)[3] ^= lp32(q)[3]
-
-#endif
-
-#elif defined( BUFFER_ALIGN64 )
-
-#define ADR_MASK A64_MASK
-#define aligned aligned64
-#define lp lp64
-#define lp_inc 8
-
-#define move_block_aligned(p,q) \
- lp64(p)[0] = lp64(q)[0], lp64(p)[1] = lp64(q)[1]
-
-#define xor_block_aligned(p,q) \
- lp64(p)[0] ^= lp64(q)[0], lp64(p)[1] ^= lp64(q)[1]
-
-#else
-#define aligned(x) 0
-#endif
-
-#define move_block(p,q) memcpy((p), (q), BLOCK_LEN)
-
-#define xor_block(p,q) \
- lp08(p)[ 0] ^= lp08(q)[ 0], lp08(p)[ 1] ^= lp08(q)[ 1], \
- lp08(p)[ 2] ^= lp08(q)[ 2], lp08(p)[ 3] ^= lp08(q)[ 3], \
- lp08(p)[ 4] ^= lp08(q)[ 4], lp08(p)[ 5] ^= lp08(q)[ 5], \
- lp08(p)[ 6] ^= lp08(q)[ 6], lp08(p)[ 7] ^= lp08(q)[ 7], \
- lp08(p)[ 8] ^= lp08(q)[ 8], lp08(p)[ 9] ^= lp08(q)[ 9], \
- lp08(p)[10] ^= lp08(q)[10], lp08(p)[11] ^= lp08(q)[11], \
- lp08(p)[12] ^= lp08(q)[12], lp08(p)[13] ^= lp08(q)[13], \
- lp08(p)[14] ^= lp08(q)[14], lp08(p)[15] ^= lp08(q)[15]
-
-
-#define gf_dat(q) {\
- q(0x00), q(0x01), q(0x02), q(0x03), q(0x04), q(0x05), q(0x06), q(0x07),\
- q(0x08), q(0x09), q(0x0a), q(0x0b), q(0x0c), q(0x0d), q(0x0e), q(0x0f),\
- q(0x10), q(0x11), q(0x12), q(0x13), q(0x14), q(0x15), q(0x16), q(0x17),\
- q(0x18), q(0x19), q(0x1a), q(0x1b), q(0x1c), q(0x1d), q(0x1e), q(0x1f),\
- q(0x20), q(0x21), q(0x22), q(0x23), q(0x24), q(0x25), q(0x26), q(0x27),\
- q(0x28), q(0x29), q(0x2a), q(0x2b), q(0x2c), q(0x2d), q(0x2e), q(0x2f),\
- q(0x30), q(0x31), q(0x32), q(0x33), q(0x34), q(0x35), q(0x36), q(0x37),\
- q(0x38), q(0x39), q(0x3a), q(0x3b), q(0x3c), q(0x3d), q(0x3e), q(0x3f),\
- q(0x40), q(0x41), q(0x42), q(0x43), q(0x44), q(0x45), q(0x46), q(0x47),\
- q(0x48), q(0x49), q(0x4a), q(0x4b), q(0x4c), q(0x4d), q(0x4e), q(0x4f),\
- q(0x50), q(0x51), q(0x52), q(0x53), q(0x54), q(0x55), q(0x56), q(0x57),\
- q(0x58), q(0x59), q(0x5a), q(0x5b), q(0x5c), q(0x5d), q(0x5e), q(0x5f),\
- q(0x60), q(0x61), q(0x62), q(0x63), q(0x64), q(0x65), q(0x66), q(0x67),\
- q(0x68), q(0x69), q(0x6a), q(0x6b), q(0x6c), q(0x6d), q(0x6e), q(0x6f),\
- q(0x70), q(0x71), q(0x72), q(0x73), q(0x74), q(0x75), q(0x76), q(0x77),\
- q(0x78), q(0x79), q(0x7a), q(0x7b), q(0x7c), q(0x7d), q(0x7e), q(0x7f),\
- q(0x80), q(0x81), q(0x82), q(0x83), q(0x84), q(0x85), q(0x86), q(0x87),\
- q(0x88), q(0x89), q(0x8a), q(0x8b), q(0x8c), q(0x8d), q(0x8e), q(0x8f),\
- q(0x90), q(0x91), q(0x92), q(0x93), q(0x94), q(0x95), q(0x96), q(0x97),\
- q(0x98), q(0x99), q(0x9a), q(0x9b), q(0x9c), q(0x9d), q(0x9e), q(0x9f),\
- q(0xa0), q(0xa1), q(0xa2), q(0xa3), q(0xa4), q(0xa5), q(0xa6), q(0xa7),\
- q(0xa8), q(0xa9), q(0xaa), q(0xab), q(0xac), q(0xad), q(0xae), q(0xaf),\
- q(0xb0), q(0xb1), q(0xb2), q(0xb3), q(0xb4), q(0xb5), q(0xb6), q(0xb7),\
- q(0xb8), q(0xb9), q(0xba), q(0xbb), q(0xbc), q(0xbd), q(0xbe), q(0xbf),\
- q(0xc0), q(0xc1), q(0xc2), q(0xc3), q(0xc4), q(0xc5), q(0xc6), q(0xc7),\
- q(0xc8), q(0xc9), q(0xca), q(0xcb), q(0xcc), q(0xcd), q(0xce), q(0xcf),\
- q(0xd0), q(0xd1), q(0xd2), q(0xd3), q(0xd4), q(0xd5), q(0xd6), q(0xd7),\
- q(0xd8), q(0xd9), q(0xda), q(0xdb), q(0xdc), q(0xdd), q(0xde), q(0xdf),\
- q(0xe0), q(0xe1), q(0xe2), q(0xe3), q(0xe4), q(0xe5), q(0xe6), q(0xe7),\
- q(0xe8), q(0xe9), q(0xea), q(0xeb), q(0xec), q(0xed), q(0xee), q(0xef),\
- q(0xf0), q(0xf1), q(0xf2), q(0xf3), q(0xf4), q(0xf5), q(0xf6), q(0xf7),\
- q(0xf8), q(0xf9), q(0xfa), q(0xfb), q(0xfc), q(0xfd), q(0xfe), q(0xff) }
-
-/* given the value i in 0..255 as the byte overflow when a a field */
-/* element in GHASH is multipled by x^8, this function will return */
-/* the values that are generated in the lo 16-bit word of the field */
-/* value by applying the modular polynomial. The values lo_byte and */
-/* hi_byte are returned via the macro xp_fun(lo_byte, hi_byte) so */
-/* that the values can be assembled into memory as required by a */
-/* suitable definition of this macro operating on the table above */
-
-#define xp(i) xp_fun( \
- (i & 0x80 ? 0xe1 : 0) ^ (i & 0x40 ? 0x70 : 0) ^ \
- (i & 0x20 ? 0x38 : 0) ^ (i & 0x10 ? 0x1c : 0) ^ \
- (i & 0x08 ? 0x0e : 0) ^ (i & 0x04 ? 0x07 : 0) ^ \
- (i & 0x02 ? 0x03 : 0) ^ (i & 0x01 ? 0x01 : 0), \
- (i & 0x80 ? 0x00 : 0) ^ (i & 0x40 ? 0x80 : 0) ^ \
- (i & 0x20 ? 0x40 : 0) ^ (i & 0x10 ? 0x20 : 0) ^ \
- (i & 0x08 ? 0x10 : 0) ^ (i & 0x04 ? 0x08 : 0) ^ \
- (i & 0x02 ? 0x84 : 0) ^ (i & 0x01 ? 0xc2 : 0) )
-
-#define xp64(i) xp_fun( \
- (i & 0x80 ? 0xd8 : 0) ^ (i & 0x40 ? 0x6c : 0) ^ \
- (i & 0x20 ? 0x36 : 0) ^ (i & 0x10 ? 0x1b : 0) ^ \
- (i & 0x08 ? 0x0d : 0) ^ (i & 0x04 ? 0x06 : 0) ^ \
- (i & 0x02 ? 0x03 : 0) ^ (i & 0x01 ? 0x01 : 0), \
- (i & 0x80 ? 0x00 : 0) ^ (i & 0x40 ? 0x00 : 0) ^ \
- (i & 0x20 ? 0x00 : 0) ^ (i & 0x10 ? 0x00 : 0) ^ \
- (i & 0x08 ? 0x80 : 0) ^ (i & 0x04 ? 0xc0 : 0) ^ \
- (i & 0x02 ? 0x60 : 0) ^ (i & 0x01 ? 0xb0 : 0) )
-
-static mode(32t) gf_poly[2] = { 0, 0xe1000000 };
-static mode(32t) gf_poly64[2] = { 0, 0xd8000000 };
-
-/* Multiply of a GF128 field element by x. The field element */
-/* is held in an array of bytes in which field bits 8n..8n + 7 */
-/* are held in byte[n], with lower indexed bits placed in the */
-/* more numerically significant bit positions in bytes. */
-
-/* This function multiples a field element x, in the polynomial */
-/* field representation. It uses 32-bit word operations to gain */
-/* speed but compensates for machine endianess and hence works */
-/* correctly on both styles of machine */
-
-in_line void mul_x(mode(32t) x[4])
-{ mode(32t) t;
-
- bsw_32(x, 4);
-
- /* at this point the filed element bits 0..127 are set out */
- /* as follows in 32-bit words (where the most significant */
- /* (ms) numeric bits are to the left) */
- /* */
- /* x[0] x[1] x[2] x[3] */
- /* ms ls ms ls ms ls ms ls */
- /* field: 0 ... 31 32 .. 63 64 .. 95 96 .. 127 */
-
- t = gf_poly[x[3] & 1]; /* bit 127 of the element */
- x[3] = (x[3] >> 1) | (x[2] << 31); /* shift bits up by one */
- x[2] = (x[2] >> 1) | (x[1] << 31); /* position */
- x[1] = (x[1] >> 1) | (x[0] << 31); /* if bit 7 is 1 xor in */
- x[0] = (x[0] >> 1) ^ t; /* the field polynomial */
- bsw_32(x, 4);
-}
-
-in_line void mul_x64(mode(32t) x[2])
-{ mode(32t) t;
-
- bsw_32(x, 2);
-
- /* at this point the filed element bits 0..127 are set out */
- /* as follows in 32-bit words (where the most significant */
- /* (ms) numeric bits are to the left) */
- /* */
- /* x[0] x[1] x[2] x[3] */
- /* ms ls ms ls ms ls ms ls */
- /* field: 0 ... 31 32 .. 63 64 .. 95 96 .. 127 */
-
- t = gf_poly64[x[1] & 1]; /* bit 127 of the element */
- /* shift bits up by one */
- /* position */
- x[1] = (x[1] >> 1) | (x[0] << 31); /* if bit 7 is 1 xor in */
- x[0] = (x[0] >> 1) ^ t; /* the field polynomial */
- bsw_32(x, 2);
-}
-
-/* Multiply of a GF128 field element by x^8 using 32-bit words */
-/* for speed - machine endianess matters here */
-
-#if (PLATFORM_BYTE_ORDER == BRG_LITTLE_ENDIAN)
-
-#define xp_fun(x,y) ((mode(32t))(x)) | (((mode(32t))(y)) << 8)
-static const unsigned __int16 gft_le[256] = gf_dat(xp);
-static const unsigned __int16 gft_le64[256] = gf_dat(xp64);
-
-in_line void mul_lex8(mode(32t) x[4]) /* mutiply with long words */
-{ mode(32t) t = (x[3] >> 24); /* in little endian format */
- x[3] = (x[3] << 8) | (x[2] >> 24);
- x[2] = (x[2] << 8) | (x[1] >> 24);
- x[1] = (x[1] << 8) | (x[0] >> 24);
- x[0] = (x[0] << 8) ^ gft_le[t];
-}
-
-in_line void mul_lex8_64(mode(32t) x[2]) /* mutiply with long words */
-{ mode(32t) t = (x[1] >> 24); /* in little endian format */
- x[1] = (x[1] << 8) | (x[0] >> 24);
- x[0] = (x[0] << 8) ^ gft_le64[t];
-}
-
-#endif
-
-#if 1 || (PLATFORM_BYTE_ORDER == BRG_LITTLE_ENDIAN)
-
-#undef xp_fun
-#define xp_fun(x,y) ((mode(32t))(y)) | (((mode(32t))(x)) << 8)
-static const unsigned __int16 gft_be[256] = gf_dat(xp);
-static const unsigned __int16 gft_be64[256] = gf_dat(xp64);
-
-in_line void mul_bex8(mode(32t) x[4]) /* mutiply with long words */
-{ mode(32t) t = (x[3] & 0xff); /* in big endian format */
- x[3] = (x[3] >> 8) | (x[2] << 24);
- x[2] = (x[2] >> 8) | (x[1] << 24);
- x[1] = (x[1] >> 8) | (x[0] << 24);
- x[0] = (x[0] >> 8) ^ (((mode(32t))gft_be[t]) << 16);
-}
-
-in_line void mul_bex8_64(mode(32t) x[2]) /* mutiply with long words */
-{ mode(32t) t = (x[1] & 0xff); /* in big endian format */
- x[1] = (x[1] >> 8) | (x[0] << 24);
- x[0] = (x[0] >> 8) ^ (((mode(32t))gft_be64[t]) << 16);
-}
-
-#endif
-
-/* hence choose the correct version for the machine endianess */
-
-#if PLATFORM_BYTE_ORDER == BRG_BIG_ENDIAN
-#define mul_x8 mul_bex8
-#define mul_x8_64 mul_bex8_64
-#else
-#define mul_x8 mul_lex8
-#define mul_x8_64 mul_lex8_64
-#endif
-
-/* different versions of the general gf_mul function are provided */
-/* here. Sadly none are very fast :-( */
-
-void GfMul128 (void *a, const void* b)
-{ mode(32t) r[CBLK_LEN >> 2], p[8][CBLK_LEN >> 2];
- int i;
-
- move_block_aligned(p[0], b);
- bsw_32(p[0], 4);
- for(i = 0; i < 7; ++i)
- {
- p[i + 1][3] = (p[i][3] >> 1) | (p[i][2] << 31);
- p[i + 1][2] = (p[i][2] >> 1) | (p[i][1] << 31);
- p[i + 1][1] = (p[i][1] >> 1) | (p[i][0] << 31);
- p[i + 1][0] = (p[i][0] >> 1) ^ gf_poly[p[i][3] & 1];
- }
-
- memset(r, 0, CBLK_LEN);
- for(i = 0; i < 16; ++i)
- {
- if(i) mul_bex8(r); /* order is always big endian here */
-
- if(((unsigned char*)a)[15 - i] & 0x80)
- xor_block_aligned(r, p[0]);
- if(((unsigned char*)a)[15 - i] & 0x40)
- xor_block_aligned(r, p[1]);
- if(((unsigned char*)a)[15 - i] & 0x20)
- xor_block_aligned(r, p[2]);
- if(((unsigned char*)a)[15 - i] & 0x10)
- xor_block_aligned(r, p[3]);
- if(((unsigned char*)a)[15 - i] & 0x08)
- xor_block_aligned(r, p[4]);
- if(((unsigned char*)a)[15 - i] & 0x04)
- xor_block_aligned(r, p[5]);
- if(((unsigned char*)a)[15 - i] & 0x02)
- xor_block_aligned(r, p[6]);
- if(((unsigned char*)a)[15 - i] & 0x01)
- xor_block_aligned(r, p[7]);
- }
- bsw_32(r, 4);
- move_block_aligned(a, r);
-}
-
-#if defined( UNROLL_LOOPS )
-
-#define xor_8k(i) \
- xor_block_aligned(r, ctx->gf_t8k[i + i][a[i] & 15]); \
- xor_block_aligned(r, ctx->gf_t8k[i + i + 1][a[i] >> 4])
-
-
-void GfMul128Tab (unsigned char a[CBLK_LEN], GfCtx8k *ctx)
-{ unsigned __int32 r[CBLK_LEN >> 2];
-
- move_block_aligned(r, ctx->gf_t8k[0][a[0] & 15]);
- xor_block_aligned(r, ctx->gf_t8k[1][a[0] >> 4]);
- xor_8k( 1); xor_8k( 2); xor_8k( 3);
- xor_8k( 4); xor_8k( 5); xor_8k( 6); xor_8k( 7);
- xor_8k( 8); xor_8k( 9); xor_8k(10); xor_8k(11);
- xor_8k(12); xor_8k(13); xor_8k(14); xor_8k(15);
- move_block_aligned(a, r);
-}
-
-#else
-
-void GfMul128Tab (unsigned char a[CBLK_LEN], GfCtx8k *ctx)
-{ unsigned __int32 r[CBLK_LEN >> 2], *p;
- int i;
-
- p = ctx->gf_t8k[0][a[0] & 15];
- memcpy(r, p, CBLK_LEN);
- p = ctx->gf_t8k[1][a[0] >> 4];
- xor_block_aligned(r, p);
- for(i = 1; i < CBLK_LEN; ++i)
- {
- xor_block_aligned(r, ctx->gf_t8k[i + i][a[i] & 15]);
- xor_block_aligned(r, ctx->gf_t8k[i + i + 1][a[i] >> 4]);
- }
- memcpy(a, r, CBLK_LEN);
-}
-
-#endif
-
-void compile_8k_table(unsigned __int8 *a, GfCtx8k *ctx)
-{ int i, j, k;
-
- memset(ctx->gf_t8k, 0, 32 * 16 * 16);
- for(i = 0; i < 2 * CBLK_LEN; ++i)
- {
- if(i == 0)
- {
- memcpy(ctx->gf_t8k[1][8], a, CBLK_LEN);
- for(j = 4; j > 0; j >>= 1)
- {
- memcpy(ctx->gf_t8k[1][j], ctx->gf_t8k[1][j + j], CBLK_LEN);
- mul_x(ctx->gf_t8k[1][j]);
- }
- memcpy(ctx->gf_t8k[0][8], ctx->gf_t8k[1][1], CBLK_LEN);
- mul_x(ctx->gf_t8k[0][8]);
- for(j = 4; j > 0; j >>= 1)
- {
- memcpy(ctx->gf_t8k[0][j], ctx->gf_t8k[0][j + j], CBLK_LEN);
- mul_x(ctx->gf_t8k[0][j]);
- }
- }
- else if(i > 1)
- for(j = 8; j > 0; j >>= 1)
- {
- memcpy(ctx->gf_t8k[i][j], ctx->gf_t8k[i - 2][j], CBLK_LEN);
- mul_x8(ctx->gf_t8k[i][j]);
- }
-
- for(j = 2; j < 16; j += j)
- {
- mode(32t) *pj = ctx->gf_t8k[i][j];
- mode(32t) *pk = ctx->gf_t8k[i][1];
- mode(32t) *pl = ctx->gf_t8k[i][j + 1];
-
- for(k = 1; k < j; ++k)
- {
- *pl++ = pj[0] ^ *pk++;
- *pl++ = pj[1] ^ *pk++;
- *pl++ = pj[2] ^ *pk++;
- *pl++ = pj[3] ^ *pk++;
- }
- }
- }
-}
-
-
-void compile_4k_table64(unsigned __int8 *a, GfCtx4k64 *ctx)
-{ int i, j, k;
-
- memset(ctx->gf_t4k, 0, sizeof(ctx->gf_t4k));
- for(i = 0; i < 2 * CBLK_LEN8; ++i)
- {
- if(i == 0)
- {
- memcpy(ctx->gf_t4k[1][8], a, CBLK_LEN8);
- for(j = 4; j > 0; j >>= 1)
- {
- memcpy(ctx->gf_t4k[1][j], ctx->gf_t4k[1][j + j], CBLK_LEN8);
- mul_x64(ctx->gf_t4k[1][j]);
- }
- memcpy(ctx->gf_t4k[0][8], ctx->gf_t4k[1][1], CBLK_LEN8);
- mul_x64(ctx->gf_t4k[0][8]);
- for(j = 4; j > 0; j >>= 1)
- {
- memcpy(ctx->gf_t4k[0][j], ctx->gf_t4k[0][j + j], CBLK_LEN8);
- mul_x64(ctx->gf_t4k[0][j]);
- }
- }
- else if(i > 1)
- for(j = 8; j > 0; j >>= 1)
- {
- memcpy(ctx->gf_t4k[i][j], ctx->gf_t4k[i - 2][j], CBLK_LEN8);
- mul_x8_64(ctx->gf_t4k[i][j]);
- }
-
- for(j = 2; j < 16; j += j)
- {
- mode(32t) *pj = ctx->gf_t4k[i][j];
- mode(32t) *pk = ctx->gf_t4k[i][1];
- mode(32t) *pl = ctx->gf_t4k[i][j + 1];
-
- for(k = 1; k < j; ++k)
- {
- *pl++ = pj[0] ^ *pk++;
- *pl++ = pj[1] ^ *pk++;
- *pl++ = pj[2] ^ *pk++;
- *pl++ = pj[3] ^ *pk++;
- }
- }
- }
-}
-
-static int IsBitSet128 (unsigned int bit, unsigned __int8 *a)
-{
- return a[(127 - bit) / 8] & (0x80 >> ((127 - bit) % 8));
-}
-
-static int IsBitSet64 (unsigned int bit, unsigned __int8 *a)
-{
- return a[(63 - bit) / 8] & (0x80 >> ((63 - bit) % 8));
-}
-
-static void SetBit128 (unsigned int bit, unsigned __int8 *a)
-{
- a[(127 - bit) / 8] |= 0x80 >> ((127 - bit) % 8);
-}
-
-static void SetBit64 (unsigned int bit, unsigned __int8 *a)
-{
- a[(63 - bit) / 8] |= 0x80 >> ((63 - bit) % 8);
-}
-
-void MirrorBits128 (unsigned __int8 *a)
-{
- unsigned __int8 t[128 / 8];
- int i;
- memset (t,0,16);
- for (i = 0; i < 128; i++)
- {
- if (IsBitSet128(i, a))
- SetBit128 (127 - i, t);
- }
- memcpy (a, t, sizeof (t));
- burn (t,sizeof (t));
-}
-
-void MirrorBits64 (unsigned __int8 *a)
-{
- unsigned __int8 t[64 / 8];
- int i;
- memset (t,0,8);
- for (i = 0; i < 64; i++)
- {
- if (IsBitSet64(i, a))
- SetBit64 (63 - i, t);
- }
- memcpy (a, t, sizeof (t));
- burn (t,sizeof (t));
-}
-
-/* Allocate and initialize speed optimization table
- for multiplication by 64-bit operand in MSB-first mode */
-int Gf128Tab64Init (unsigned __int8 *a, GfCtx *ctx)
-{
- GfCtx8k *ctx8k;
- unsigned __int8 am[16];
- int i, j;
-
- ctx8k = (GfCtx8k *) TCalloc (sizeof (GfCtx8k));
- if (!ctx8k)
- return FALSE;
-
- memcpy (am, a, 16);
- MirrorBits128 (am);
- compile_8k_table (am, ctx8k);
-
- /* Convert 8k LSB-first table to 4k MSB-first */
- for (i = 16; i < 32; i++)
- {
- for (j = 0; j < 16; j++)
- {
- int jm = 0;
- jm |= (j & 0x1) << 3;
- jm |= (j & 0x2) << 1;
- jm |= (j & 0x4) >> 1;
- jm |= (j & 0x8) >> 3;
-
- memcpy (&ctx->gf_t128[i-16][jm], (unsigned char *)&ctx8k->gf_t8k[31-i][j], 16);
- MirrorBits128 ((unsigned char *)&ctx->gf_t128[i-16][jm]);
- }
- }
-
- burn (ctx8k ,sizeof (*ctx8k));
- burn (am, sizeof (am));
- TCfree (ctx8k);
- return TRUE;
-}
-
-
-#define xor_8kt64(i) \
- xor_block_aligned(r, ctx->gf_t128[i + i][a[i] & 15]); \
- xor_block_aligned(r, ctx->gf_t128[i + i + 1][a[i] >> 4])
-
-/* Multiply a 128-bit number by a 64-bit number in the finite field GF(2^128) */
-void Gf128MulBy64Tab (unsigned __int8 a[8], unsigned __int8 p[16], GfCtx *ctx)
-{
- unsigned __int32 r[CBLK_LEN >> 2];
-
- move_block_aligned(r, ctx->gf_t128[7*2][a[7] & 15]);
- xor_block_aligned(r, ctx->gf_t128[7*2+1][a[7] >> 4]);
-
- if (*(unsigned __int16 *)a)
- {
- xor_8kt64(0);
- xor_8kt64(1);
- }
- if (a[2])
- {
- xor_8kt64(2);
- }
- xor_8kt64(3);
- xor_8kt64(4);
- xor_8kt64(5);
- xor_8kt64(6);
-
- move_block_aligned(p, r);
-}
-
-
-
-/* Basic algorithms for testing of optimized algorithms */
-
-static void xor128 (uint64 *a, uint64 *b)
-{
- *a++ ^= *b++;
- *a ^= *b;
-}
-
-static void shl128 (unsigned __int8 *a)
-{
- int i, x = 0, xx;
- for (i = 15; i >= 0; i--)
- {
- xx = (a[i] & 0x80) >> 7;
- a[i] = (char) ((a[i] << 1) | x);
- x = xx;
- }
-}
-
-static void GfMul128Basic (unsigned __int8 *a, unsigned __int8 *b, unsigned __int8 *p)
-{
- int i;
- unsigned __int8 la[16];
- memcpy (la, a, 16);
- memset (p, 0, 16);
-
- for (i = 0; i < 128; i++)
- {
- if (IsBitSet128 (i, b))
- xor128 ((uint64 *)p, (uint64 *)la);
-
- if (la[0] & 0x80)
- {
- shl128 (la);
- la[15] ^= 0x87;
- }
- else
- {
- shl128 (la);
- }
- }
-}
-
-
-BOOL GfMulSelfTest ()
-{
- BOOL result = TRUE;
- unsigned __int8 a[16];
- unsigned __int8 b[16];
- unsigned __int8 p1[16];
- unsigned __int8 p2[16];
- GfCtx *gfCtx = (GfCtx *) TCalloc (sizeof (GfCtx));
- int i, j;
-
- if (!gfCtx)
- return FALSE;
-
-
- /* GF(2^128) */
- for (i = 0; i < 0x100; i++)
- {
- for (j = 0; j < 16; j++)
- {
- a[j] = (unsigned __int8) i;
- b[j] = j < 8 ? 0 : a[j] ^ 0xff;
- }
-
- GfMul128Basic (a, b, p1);
-
- Gf128Tab64Init (a, gfCtx);
- Gf128MulBy64Tab (b + 8, p2, gfCtx);
-
- if (memcmp (p1, p2, 16) != 0)
- result = FALSE;
- }
-
- TCfree (gfCtx);
- return result;
-}
-
-#if defined(__cplusplus)
-}
-#endif
+/* + --------------------------------------------------------------------------- + Copyright (c) 2003, Dr Brian Gladman, Worcester, UK. All rights reserved. + + LICENSE TERMS + + The free distribution and use of this software is allowed (with or without + changes) provided that: + + 1. source code distributions include the above copyright notice, this + list of conditions and the following disclaimer; + + 2. binary distributions include the above copyright notice, this list + of conditions and the following disclaimer in their documentation; + + 3. the name of the copyright holder is not used to endorse products + built using this software without specific written permission. + + DISCLAIMER + + This software is provided 'as is' with no explicit or implied warranties + in respect of its properties, including, but not limited to, correctness + and/or fitness for purpose. + --------------------------------------------------------------------------- + Issue Date: 31/01/2004 + + My thanks to John Viega and David McGrew for their support in developing + this code and to David for testing it on a big-endain system. +*/ + +/* + --------------------------------------------------------------------------- + Portions Copyright (c) 2005 TrueCrypt Developers Association + + Changes: + + - Added multiplication in the finite field GF(2^128) optimized for + cases involving a 64-bit operand. + + - Added multiplication in the finite field GF(2^64). + + - Added MSB-first mode. + + - Added basic test algorithms. + + - Removed GCM. + --------------------------------------------------------------------------- +*/ + +#include <memory.h> +#include <stdlib.h> +#include "GfMul.h" +#include "Tcdefs.h" +#include "Common/Endian.h" + +/* BUFFER_ALIGN32 or BUFFER_ALIGN64 must be defined at this point to */ +/* enable faster operation by taking advantage of memory aligned values */ +/* NOTE: the BUFFER_ALIGN64 option has not been tested extensively */ + +#define BUFFER_ALIGN32 +#define UNROLL_LOOPS /* define to unroll some loops */ +#define IN_LINES /* define to use inline functions */ + /* in place of macros */ + +#define mode(x) GM_##x + +#if defined(__cplusplus) +extern "C" +{ +#endif + +typedef unsigned __int32 mode(32t); +typedef uint64 mode(64t); + +#define BRG_LITTLE_ENDIAN 1234 /* byte 0 is least significant (i386) */ +#define BRG_BIG_ENDIAN 4321 /* byte 0 is most significant (mc68k) */ + +#if BYTE_ORDER == LITTLE_ENDIAN +# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN +#endif + +#if BYTE_ORDER == BIG_ENDIAN +# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN +#endif + +#ifdef _MSC_VER +#pragma intrinsic(memcpy) +#define in_line __inline +#else +#define in_line +#endif + +#if 0 && defined(_MSC_VER) +#define rotl32 _lrotl +#define rotr32 _lrotr +#else +#define rotl32(x,n) (((x) << n) | ((x) >> (32 - n))) +#define rotr32(x,n) (((x) >> n) | ((x) << (32 - n))) +#endif + +#if !defined(bswap_32) +#define bswap_32(x) ((rotr32((x), 24) & 0x00ff00ff) | (rotr32((x), 8) & 0xff00ff00)) +#endif + +#if (PLATFORM_BYTE_ORDER == BRG_LITTLE_ENDIAN) +#define SWAP_BYTES +#else +#undef SWAP_BYTES +#endif + +#if defined(SWAP_BYTES) + +#if defined ( IN_LINES ) + +in_line void bsw_32(void * p, unsigned int n) +{ unsigned int i = n; + while(i--) + ((mode(32t)*)p)[i] = bswap_32(((mode(32t)*)p)[i]); +} + +#else + +#define bsw_32(p,n) \ + { int _i = (n); while(_i--) ((mode(32t)*)p)[_i] = bswap_32(((mode(32t)*)p)[_i]); } + +#endif + +#else +#define bsw_32(p,n) +#endif + +/* These values are used to detect long word alignment in order */ +/* to speed up some GCM buffer operations. This facility may */ +/* not work on some machines */ + +#define lp08(x) ((unsigned char*)(x)) +#define lp32(x) ((mode(32t)*)(x)) +#define lp64(x) ((mode(64t)*)(x)) + +#define A32_MASK 3 +#define A64_MASK 7 +#define aligned32(x) (!(((mode(32t))(x)) & A32_MASK)) +#define aligned64(x) (!(((mode(32t))(x)) & A64_MASK)) + +#if defined( BUFFER_ALIGN32 ) + +#define ADR_MASK A32_MASK +#define aligned aligned32 +#define lp lp32 +#define lp_inc 4 + +#if defined( IN_LINES ) + +in_line void move_block_aligned( void *p, const void *q) +{ + lp32(p)[0] = lp32(q)[0], lp32(p)[1] = lp32(q)[1], + lp32(p)[2] = lp32(q)[2], lp32(p)[3] = lp32(q)[3]; +} + +in_line void move_block_aligned64( void *p, const void *q) +{ + lp32(p)[0] = lp32(q)[0], lp32(p)[1] = lp32(q)[1]; +} + +in_line void xor_block_aligned( void *p, const void *q) +{ + lp32(p)[0] ^= lp32(q)[0], lp32(p)[1] ^= lp32(q)[1], + lp32(p)[2] ^= lp32(q)[2], lp32(p)[3] ^= lp32(q)[3]; +} + +in_line void xor_block_aligned64( void *p, const void *q) +{ + lp32(p)[0] ^= lp32(q)[0], lp32(p)[1] ^= lp32(q)[1]; +} + +#else + +#define move_block_aligned(p,q) \ + lp32(p)[0] = lp32(q)[0], lp32(p)[1] = lp32(q)[1], \ + lp32(p)[2] = lp32(q)[2], lp32(p)[3] = lp32(q)[3] + +#define xor_block_aligned(p,q) \ + lp32(p)[0] ^= lp32(q)[0], lp32(p)[1] ^= lp32(q)[1], \ + lp32(p)[2] ^= lp32(q)[2], lp32(p)[3] ^= lp32(q)[3] + +#endif + +#elif defined( BUFFER_ALIGN64 ) + +#define ADR_MASK A64_MASK +#define aligned aligned64 +#define lp lp64 +#define lp_inc 8 + +#define move_block_aligned(p,q) \ + lp64(p)[0] = lp64(q)[0], lp64(p)[1] = lp64(q)[1] + +#define xor_block_aligned(p,q) \ + lp64(p)[0] ^= lp64(q)[0], lp64(p)[1] ^= lp64(q)[1] + +#else +#define aligned(x) 0 +#endif + +#define move_block(p,q) memcpy((p), (q), BLOCK_LEN) + +#define xor_block(p,q) \ + lp08(p)[ 0] ^= lp08(q)[ 0], lp08(p)[ 1] ^= lp08(q)[ 1], \ + lp08(p)[ 2] ^= lp08(q)[ 2], lp08(p)[ 3] ^= lp08(q)[ 3], \ + lp08(p)[ 4] ^= lp08(q)[ 4], lp08(p)[ 5] ^= lp08(q)[ 5], \ + lp08(p)[ 6] ^= lp08(q)[ 6], lp08(p)[ 7] ^= lp08(q)[ 7], \ + lp08(p)[ 8] ^= lp08(q)[ 8], lp08(p)[ 9] ^= lp08(q)[ 9], \ + lp08(p)[10] ^= lp08(q)[10], lp08(p)[11] ^= lp08(q)[11], \ + lp08(p)[12] ^= lp08(q)[12], lp08(p)[13] ^= lp08(q)[13], \ + lp08(p)[14] ^= lp08(q)[14], lp08(p)[15] ^= lp08(q)[15] + + +#define gf_dat(q) {\ + q(0x00), q(0x01), q(0x02), q(0x03), q(0x04), q(0x05), q(0x06), q(0x07),\ + q(0x08), q(0x09), q(0x0a), q(0x0b), q(0x0c), q(0x0d), q(0x0e), q(0x0f),\ + q(0x10), q(0x11), q(0x12), q(0x13), q(0x14), q(0x15), q(0x16), q(0x17),\ + q(0x18), q(0x19), q(0x1a), q(0x1b), q(0x1c), q(0x1d), q(0x1e), q(0x1f),\ + q(0x20), q(0x21), q(0x22), q(0x23), q(0x24), q(0x25), q(0x26), q(0x27),\ + q(0x28), q(0x29), q(0x2a), q(0x2b), q(0x2c), q(0x2d), q(0x2e), q(0x2f),\ + q(0x30), q(0x31), q(0x32), q(0x33), q(0x34), q(0x35), q(0x36), q(0x37),\ + q(0x38), q(0x39), q(0x3a), q(0x3b), q(0x3c), q(0x3d), q(0x3e), q(0x3f),\ + q(0x40), q(0x41), q(0x42), q(0x43), q(0x44), q(0x45), q(0x46), q(0x47),\ + q(0x48), q(0x49), q(0x4a), q(0x4b), q(0x4c), q(0x4d), q(0x4e), q(0x4f),\ + q(0x50), q(0x51), q(0x52), q(0x53), q(0x54), q(0x55), q(0x56), q(0x57),\ + q(0x58), q(0x59), q(0x5a), q(0x5b), q(0x5c), q(0x5d), q(0x5e), q(0x5f),\ + q(0x60), q(0x61), q(0x62), q(0x63), q(0x64), q(0x65), q(0x66), q(0x67),\ + q(0x68), q(0x69), q(0x6a), q(0x6b), q(0x6c), q(0x6d), q(0x6e), q(0x6f),\ + q(0x70), q(0x71), q(0x72), q(0x73), q(0x74), q(0x75), q(0x76), q(0x77),\ + q(0x78), q(0x79), q(0x7a), q(0x7b), q(0x7c), q(0x7d), q(0x7e), q(0x7f),\ + q(0x80), q(0x81), q(0x82), q(0x83), q(0x84), q(0x85), q(0x86), q(0x87),\ + q(0x88), q(0x89), q(0x8a), q(0x8b), q(0x8c), q(0x8d), q(0x8e), q(0x8f),\ + q(0x90), q(0x91), q(0x92), q(0x93), q(0x94), q(0x95), q(0x96), q(0x97),\ + q(0x98), q(0x99), q(0x9a), q(0x9b), q(0x9c), q(0x9d), q(0x9e), q(0x9f),\ + q(0xa0), q(0xa1), q(0xa2), q(0xa3), q(0xa4), q(0xa5), q(0xa6), q(0xa7),\ + q(0xa8), q(0xa9), q(0xaa), q(0xab), q(0xac), q(0xad), q(0xae), q(0xaf),\ + q(0xb0), q(0xb1), q(0xb2), q(0xb3), q(0xb4), q(0xb5), q(0xb6), q(0xb7),\ + q(0xb8), q(0xb9), q(0xba), q(0xbb), q(0xbc), q(0xbd), q(0xbe), q(0xbf),\ + q(0xc0), q(0xc1), q(0xc2), q(0xc3), q(0xc4), q(0xc5), q(0xc6), q(0xc7),\ + q(0xc8), q(0xc9), q(0xca), q(0xcb), q(0xcc), q(0xcd), q(0xce), q(0xcf),\ + q(0xd0), q(0xd1), q(0xd2), q(0xd3), q(0xd4), q(0xd5), q(0xd6), q(0xd7),\ + q(0xd8), q(0xd9), q(0xda), q(0xdb), q(0xdc), q(0xdd), q(0xde), q(0xdf),\ + q(0xe0), q(0xe1), q(0xe2), q(0xe3), q(0xe4), q(0xe5), q(0xe6), q(0xe7),\ + q(0xe8), q(0xe9), q(0xea), q(0xeb), q(0xec), q(0xed), q(0xee), q(0xef),\ + q(0xf0), q(0xf1), q(0xf2), q(0xf3), q(0xf4), q(0xf5), q(0xf6), q(0xf7),\ + q(0xf8), q(0xf9), q(0xfa), q(0xfb), q(0xfc), q(0xfd), q(0xfe), q(0xff) } + +/* given the value i in 0..255 as the byte overflow when a a field */ +/* element in GHASH is multipled by x^8, this function will return */ +/* the values that are generated in the lo 16-bit word of the field */ +/* value by applying the modular polynomial. The values lo_byte and */ +/* hi_byte are returned via the macro xp_fun(lo_byte, hi_byte) so */ +/* that the values can be assembled into memory as required by a */ +/* suitable definition of this macro operating on the table above */ + +#define xp(i) xp_fun( \ + (i & 0x80 ? 0xe1 : 0) ^ (i & 0x40 ? 0x70 : 0) ^ \ + (i & 0x20 ? 0x38 : 0) ^ (i & 0x10 ? 0x1c : 0) ^ \ + (i & 0x08 ? 0x0e : 0) ^ (i & 0x04 ? 0x07 : 0) ^ \ + (i & 0x02 ? 0x03 : 0) ^ (i & 0x01 ? 0x01 : 0), \ + (i & 0x80 ? 0x00 : 0) ^ (i & 0x40 ? 0x80 : 0) ^ \ + (i & 0x20 ? 0x40 : 0) ^ (i & 0x10 ? 0x20 : 0) ^ \ + (i & 0x08 ? 0x10 : 0) ^ (i & 0x04 ? 0x08 : 0) ^ \ + (i & 0x02 ? 0x84 : 0) ^ (i & 0x01 ? 0xc2 : 0) ) + +#define xp64(i) xp_fun( \ + (i & 0x80 ? 0xd8 : 0) ^ (i & 0x40 ? 0x6c : 0) ^ \ + (i & 0x20 ? 0x36 : 0) ^ (i & 0x10 ? 0x1b : 0) ^ \ + (i & 0x08 ? 0x0d : 0) ^ (i & 0x04 ? 0x06 : 0) ^ \ + (i & 0x02 ? 0x03 : 0) ^ (i & 0x01 ? 0x01 : 0), \ + (i & 0x80 ? 0x00 : 0) ^ (i & 0x40 ? 0x00 : 0) ^ \ + (i & 0x20 ? 0x00 : 0) ^ (i & 0x10 ? 0x00 : 0) ^ \ + (i & 0x08 ? 0x80 : 0) ^ (i & 0x04 ? 0xc0 : 0) ^ \ + (i & 0x02 ? 0x60 : 0) ^ (i & 0x01 ? 0xb0 : 0) ) + +static mode(32t) gf_poly[2] = { 0, 0xe1000000 }; +static mode(32t) gf_poly64[2] = { 0, 0xd8000000 }; + +/* Multiply of a GF128 field element by x. The field element */ +/* is held in an array of bytes in which field bits 8n..8n + 7 */ +/* are held in byte[n], with lower indexed bits placed in the */ +/* more numerically significant bit positions in bytes. */ + +/* This function multiples a field element x, in the polynomial */ +/* field representation. It uses 32-bit word operations to gain */ +/* speed but compensates for machine endianess and hence works */ +/* correctly on both styles of machine */ + +in_line void mul_x(mode(32t) x[4]) +{ mode(32t) t; + + bsw_32(x, 4); + + /* at this point the filed element bits 0..127 are set out */ + /* as follows in 32-bit words (where the most significant */ + /* (ms) numeric bits are to the left) */ + /* */ + /* x[0] x[1] x[2] x[3] */ + /* ms ls ms ls ms ls ms ls */ + /* field: 0 ... 31 32 .. 63 64 .. 95 96 .. 127 */ + + t = gf_poly[x[3] & 1]; /* bit 127 of the element */ + x[3] = (x[3] >> 1) | (x[2] << 31); /* shift bits up by one */ + x[2] = (x[2] >> 1) | (x[1] << 31); /* position */ + x[1] = (x[1] >> 1) | (x[0] << 31); /* if bit 7 is 1 xor in */ + x[0] = (x[0] >> 1) ^ t; /* the field polynomial */ + bsw_32(x, 4); +} + +in_line void mul_x64(mode(32t) x[2]) +{ mode(32t) t; + + bsw_32(x, 2); + + /* at this point the filed element bits 0..127 are set out */ + /* as follows in 32-bit words (where the most significant */ + /* (ms) numeric bits are to the left) */ + /* */ + /* x[0] x[1] x[2] x[3] */ + /* ms ls ms ls ms ls ms ls */ + /* field: 0 ... 31 32 .. 63 64 .. 95 96 .. 127 */ + + t = gf_poly64[x[1] & 1]; /* bit 127 of the element */ + /* shift bits up by one */ + /* position */ + x[1] = (x[1] >> 1) | (x[0] << 31); /* if bit 7 is 1 xor in */ + x[0] = (x[0] >> 1) ^ t; /* the field polynomial */ + bsw_32(x, 2); +} + +/* Multiply of a GF128 field element by x^8 using 32-bit words */ +/* for speed - machine endianess matters here */ + +#if (PLATFORM_BYTE_ORDER == BRG_LITTLE_ENDIAN) + +#define xp_fun(x,y) ((mode(32t))(x)) | (((mode(32t))(y)) << 8) +static const unsigned __int16 gft_le[256] = gf_dat(xp); +static const unsigned __int16 gft_le64[256] = gf_dat(xp64); + +in_line void mul_lex8(mode(32t) x[4]) /* mutiply with long words */ +{ mode(32t) t = (x[3] >> 24); /* in little endian format */ + x[3] = (x[3] << 8) | (x[2] >> 24); + x[2] = (x[2] << 8) | (x[1] >> 24); + x[1] = (x[1] << 8) | (x[0] >> 24); + x[0] = (x[0] << 8) ^ gft_le[t]; +} + +in_line void mul_lex8_64(mode(32t) x[2]) /* mutiply with long words */ +{ mode(32t) t = (x[1] >> 24); /* in little endian format */ + x[1] = (x[1] << 8) | (x[0] >> 24); + x[0] = (x[0] << 8) ^ gft_le64[t]; +} + +#endif + +#if 1 || (PLATFORM_BYTE_ORDER == BRG_LITTLE_ENDIAN) + +#undef xp_fun +#define xp_fun(x,y) ((mode(32t))(y)) | (((mode(32t))(x)) << 8) +static const unsigned __int16 gft_be[256] = gf_dat(xp); +static const unsigned __int16 gft_be64[256] = gf_dat(xp64); + +in_line void mul_bex8(mode(32t) x[4]) /* mutiply with long words */ +{ mode(32t) t = (x[3] & 0xff); /* in big endian format */ + x[3] = (x[3] >> 8) | (x[2] << 24); + x[2] = (x[2] >> 8) | (x[1] << 24); + x[1] = (x[1] >> 8) | (x[0] << 24); + x[0] = (x[0] >> 8) ^ (((mode(32t))gft_be[t]) << 16); +} + +in_line void mul_bex8_64(mode(32t) x[2]) /* mutiply with long words */ +{ mode(32t) t = (x[1] & 0xff); /* in big endian format */ + x[1] = (x[1] >> 8) | (x[0] << 24); + x[0] = (x[0] >> 8) ^ (((mode(32t))gft_be64[t]) << 16); +} + +#endif + +/* hence choose the correct version for the machine endianess */ + +#if PLATFORM_BYTE_ORDER == BRG_BIG_ENDIAN +#define mul_x8 mul_bex8 +#define mul_x8_64 mul_bex8_64 +#else +#define mul_x8 mul_lex8 +#define mul_x8_64 mul_lex8_64 +#endif + +/* different versions of the general gf_mul function are provided */ +/* here. Sadly none are very fast :-( */ + +void GfMul128 (void *a, const void* b) +{ mode(32t) r[CBLK_LEN >> 2], p[8][CBLK_LEN >> 2]; + int i; + + move_block_aligned(p[0], b); + bsw_32(p[0], 4); + for(i = 0; i < 7; ++i) + { + p[i + 1][3] = (p[i][3] >> 1) | (p[i][2] << 31); + p[i + 1][2] = (p[i][2] >> 1) | (p[i][1] << 31); + p[i + 1][1] = (p[i][1] >> 1) | (p[i][0] << 31); + p[i + 1][0] = (p[i][0] >> 1) ^ gf_poly[p[i][3] & 1]; + } + + memset(r, 0, CBLK_LEN); + for(i = 0; i < 16; ++i) + { + if(i) mul_bex8(r); /* order is always big endian here */ + + if(((unsigned char*)a)[15 - i] & 0x80) + xor_block_aligned(r, p[0]); + if(((unsigned char*)a)[15 - i] & 0x40) + xor_block_aligned(r, p[1]); + if(((unsigned char*)a)[15 - i] & 0x20) + xor_block_aligned(r, p[2]); + if(((unsigned char*)a)[15 - i] & 0x10) + xor_block_aligned(r, p[3]); + if(((unsigned char*)a)[15 - i] & 0x08) + xor_block_aligned(r, p[4]); + if(((unsigned char*)a)[15 - i] & 0x04) + xor_block_aligned(r, p[5]); + if(((unsigned char*)a)[15 - i] & 0x02) + xor_block_aligned(r, p[6]); + if(((unsigned char*)a)[15 - i] & 0x01) + xor_block_aligned(r, p[7]); + } + bsw_32(r, 4); + move_block_aligned(a, r); +} + +#if defined( UNROLL_LOOPS ) + +#define xor_8k(i) \ + xor_block_aligned(r, ctx->gf_t8k[i + i][a[i] & 15]); \ + xor_block_aligned(r, ctx->gf_t8k[i + i + 1][a[i] >> 4]) + + +void GfMul128Tab (unsigned char a[CBLK_LEN], GfCtx8k *ctx) +{ unsigned __int32 r[CBLK_LEN >> 2]; + + move_block_aligned(r, ctx->gf_t8k[0][a[0] & 15]); + xor_block_aligned(r, ctx->gf_t8k[1][a[0] >> 4]); + xor_8k( 1); xor_8k( 2); xor_8k( 3); + xor_8k( 4); xor_8k( 5); xor_8k( 6); xor_8k( 7); + xor_8k( 8); xor_8k( 9); xor_8k(10); xor_8k(11); + xor_8k(12); xor_8k(13); xor_8k(14); xor_8k(15); + move_block_aligned(a, r); +} + +#else + +void GfMul128Tab (unsigned char a[CBLK_LEN], GfCtx8k *ctx) +{ unsigned __int32 r[CBLK_LEN >> 2], *p; + int i; + + p = ctx->gf_t8k[0][a[0] & 15]; + memcpy(r, p, CBLK_LEN); + p = ctx->gf_t8k[1][a[0] >> 4]; + xor_block_aligned(r, p); + for(i = 1; i < CBLK_LEN; ++i) + { + xor_block_aligned(r, ctx->gf_t8k[i + i][a[i] & 15]); + xor_block_aligned(r, ctx->gf_t8k[i + i + 1][a[i] >> 4]); + } + memcpy(a, r, CBLK_LEN); +} + +#endif + +void compile_8k_table(unsigned __int8 *a, GfCtx8k *ctx) +{ int i, j, k; + + memset(ctx->gf_t8k, 0, 32 * 16 * 16); + for(i = 0; i < 2 * CBLK_LEN; ++i) + { + if(i == 0) + { + memcpy(ctx->gf_t8k[1][8], a, CBLK_LEN); + for(j = 4; j > 0; j >>= 1) + { + memcpy(ctx->gf_t8k[1][j], ctx->gf_t8k[1][j + j], CBLK_LEN); + mul_x(ctx->gf_t8k[1][j]); + } + memcpy(ctx->gf_t8k[0][8], ctx->gf_t8k[1][1], CBLK_LEN); + mul_x(ctx->gf_t8k[0][8]); + for(j = 4; j > 0; j >>= 1) + { + memcpy(ctx->gf_t8k[0][j], ctx->gf_t8k[0][j + j], CBLK_LEN); + mul_x(ctx->gf_t8k[0][j]); + } + } + else if(i > 1) + for(j = 8; j > 0; j >>= 1) + { + memcpy(ctx->gf_t8k[i][j], ctx->gf_t8k[i - 2][j], CBLK_LEN); + mul_x8(ctx->gf_t8k[i][j]); + } + + for(j = 2; j < 16; j += j) + { + mode(32t) *pj = ctx->gf_t8k[i][j]; + mode(32t) *pk = ctx->gf_t8k[i][1]; + mode(32t) *pl = ctx->gf_t8k[i][j + 1]; + + for(k = 1; k < j; ++k) + { + *pl++ = pj[0] ^ *pk++; + *pl++ = pj[1] ^ *pk++; + *pl++ = pj[2] ^ *pk++; + *pl++ = pj[3] ^ *pk++; + } + } + } +} + + +void compile_4k_table64(unsigned __int8 *a, GfCtx4k64 *ctx) +{ int i, j, k; + + memset(ctx->gf_t4k, 0, sizeof(ctx->gf_t4k)); + for(i = 0; i < 2 * CBLK_LEN8; ++i) + { + if(i == 0) + { + memcpy(ctx->gf_t4k[1][8], a, CBLK_LEN8); + for(j = 4; j > 0; j >>= 1) + { + memcpy(ctx->gf_t4k[1][j], ctx->gf_t4k[1][j + j], CBLK_LEN8); + mul_x64(ctx->gf_t4k[1][j]); + } + memcpy(ctx->gf_t4k[0][8], ctx->gf_t4k[1][1], CBLK_LEN8); + mul_x64(ctx->gf_t4k[0][8]); + for(j = 4; j > 0; j >>= 1) + { + memcpy(ctx->gf_t4k[0][j], ctx->gf_t4k[0][j + j], CBLK_LEN8); + mul_x64(ctx->gf_t4k[0][j]); + } + } + else if(i > 1) + for(j = 8; j > 0; j >>= 1) + { + memcpy(ctx->gf_t4k[i][j], ctx->gf_t4k[i - 2][j], CBLK_LEN8); + mul_x8_64(ctx->gf_t4k[i][j]); + } + + for(j = 2; j < 16; j += j) + { + mode(32t) *pj = ctx->gf_t4k[i][j]; + mode(32t) *pk = ctx->gf_t4k[i][1]; + mode(32t) *pl = ctx->gf_t4k[i][j + 1]; + + for(k = 1; k < j; ++k) + { + *pl++ = pj[0] ^ *pk++; + *pl++ = pj[1] ^ *pk++; + *pl++ = pj[2] ^ *pk++; + *pl++ = pj[3] ^ *pk++; + } + } + } +} + +static int IsBitSet128 (unsigned int bit, unsigned __int8 *a) +{ + return a[(127 - bit) / 8] & (0x80 >> ((127 - bit) % 8)); +} + +static int IsBitSet64 (unsigned int bit, unsigned __int8 *a) +{ + return a[(63 - bit) / 8] & (0x80 >> ((63 - bit) % 8)); +} + +static void SetBit128 (unsigned int bit, unsigned __int8 *a) +{ + a[(127 - bit) / 8] |= 0x80 >> ((127 - bit) % 8); +} + +static void SetBit64 (unsigned int bit, unsigned __int8 *a) +{ + a[(63 - bit) / 8] |= 0x80 >> ((63 - bit) % 8); +} + +void MirrorBits128 (unsigned __int8 *a) +{ + unsigned __int8 t[128 / 8]; + int i; + memset (t,0,16); + for (i = 0; i < 128; i++) + { + if (IsBitSet128(i, a)) + SetBit128 (127 - i, t); + } + memcpy (a, t, sizeof (t)); + burn (t,sizeof (t)); +} + +void MirrorBits64 (unsigned __int8 *a) +{ + unsigned __int8 t[64 / 8]; + int i; + memset (t,0,8); + for (i = 0; i < 64; i++) + { + if (IsBitSet64(i, a)) + SetBit64 (63 - i, t); + } + memcpy (a, t, sizeof (t)); + burn (t,sizeof (t)); +} + +/* Allocate and initialize speed optimization table + for multiplication by 64-bit operand in MSB-first mode */ +int Gf128Tab64Init (unsigned __int8 *a, GfCtx *ctx) +{ + GfCtx8k *ctx8k; + unsigned __int8 am[16]; + int i, j; + + ctx8k = (GfCtx8k *) TCalloc (sizeof (GfCtx8k)); + if (!ctx8k) + return FALSE; + + memcpy (am, a, 16); + MirrorBits128 (am); + compile_8k_table (am, ctx8k); + + /* Convert 8k LSB-first table to 4k MSB-first */ + for (i = 16; i < 32; i++) + { + for (j = 0; j < 16; j++) + { + int jm = 0; + jm |= (j & 0x1) << 3; + jm |= (j & 0x2) << 1; + jm |= (j & 0x4) >> 1; + jm |= (j & 0x8) >> 3; + + memcpy (&ctx->gf_t128[i-16][jm], (unsigned char *)&ctx8k->gf_t8k[31-i][j], 16); + MirrorBits128 ((unsigned char *)&ctx->gf_t128[i-16][jm]); + } + } + + burn (ctx8k ,sizeof (*ctx8k)); + burn (am, sizeof (am)); + TCfree (ctx8k); + return TRUE; +} + + +#define xor_8kt64(i) \ + xor_block_aligned(r, ctx->gf_t128[i + i][a[i] & 15]); \ + xor_block_aligned(r, ctx->gf_t128[i + i + 1][a[i] >> 4]) + +/* Multiply a 128-bit number by a 64-bit number in the finite field GF(2^128) */ +void Gf128MulBy64Tab (unsigned __int8 a[8], unsigned __int8 p[16], GfCtx *ctx) +{ + unsigned __int32 r[CBLK_LEN >> 2]; + + move_block_aligned(r, ctx->gf_t128[7*2][a[7] & 15]); + xor_block_aligned(r, ctx->gf_t128[7*2+1][a[7] >> 4]); + + if (*(unsigned __int16 *)a) + { + xor_8kt64(0); + xor_8kt64(1); + } + if (a[2]) + { + xor_8kt64(2); + } + xor_8kt64(3); + xor_8kt64(4); + xor_8kt64(5); + xor_8kt64(6); + + move_block_aligned(p, r); +} + + + +/* Basic algorithms for testing of optimized algorithms */ + +static void xor128 (uint64 *a, uint64 *b) +{ + *a++ ^= *b++; + *a ^= *b; +} + +static void shl128 (unsigned __int8 *a) +{ + int i, x = 0, xx; + for (i = 15; i >= 0; i--) + { + xx = (a[i] & 0x80) >> 7; + a[i] = (char) ((a[i] << 1) | x); + x = xx; + } +} + +static void GfMul128Basic (unsigned __int8 *a, unsigned __int8 *b, unsigned __int8 *p) +{ + int i; + unsigned __int8 la[16]; + memcpy (la, a, 16); + memset (p, 0, 16); + + for (i = 0; i < 128; i++) + { + if (IsBitSet128 (i, b)) + xor128 ((uint64 *)p, (uint64 *)la); + + if (la[0] & 0x80) + { + shl128 (la); + la[15] ^= 0x87; + } + else + { + shl128 (la); + } + } +} + + +BOOL GfMulSelfTest () +{ + BOOL result = TRUE; + unsigned __int8 a[16]; + unsigned __int8 b[16]; + unsigned __int8 p1[16]; + unsigned __int8 p2[16]; + GfCtx *gfCtx = (GfCtx *) TCalloc (sizeof (GfCtx)); + int i, j; + + if (!gfCtx) + return FALSE; + + + /* GF(2^128) */ + for (i = 0; i < 0x100; i++) + { + for (j = 0; j < 16; j++) + { + a[j] = (unsigned __int8) i; + b[j] = j < 8 ? 0 : a[j] ^ 0xff; + } + + GfMul128Basic (a, b, p1); + + Gf128Tab64Init (a, gfCtx); + Gf128MulBy64Tab (b + 8, p2, gfCtx); + + if (memcmp (p1, p2, 16) != 0) + result = FALSE; + } + + TCfree (gfCtx); + return result; +} + +#if defined(__cplusplus) +} +#endif |