1
0
mirror of git://git.gnupg.org/gnupg.git synced 2024-12-23 10:29:58 +01:00

317 lines
10 KiB
C
Raw Normal View History

/*
---------------------------------------------------------------------------
2004-07-20 11:48:09 +00:00
Copyright (c) 2003, Dr Brian Gladman, Worcester, UK. All rights reserved.
LICENSE TERMS
The free distribution and use of this software in both source and binary
form is allowed (with or without changes) provided that:
1. distributions of this source code include the above copyright
notice, this list of conditions and the following disclaimer;
2. distributions in binary form include the above copyright
notice, this list of conditions and the following disclaimer
in the documentation and/or other associated materials;
3. the copyright holder's name is not used to endorse products
built using this software without specific written permission.
ALTERNATIVELY, provided that this notice is retained in full, this product
may be distributed under the terms of the GNU General Public License (GPL),
in which case the provisions of the GPL apply INSTEAD OF those given above.
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.
---------------------------------------------------------------------------
2004-07-20 11:48:09 +00:00
Issue 30/06/2004
*/
#include "aesopt.h"
2004-07-20 11:48:09 +00:00
#include "aestab.h"
#if defined(__cplusplus)
extern "C"
{
#endif
#define si(y,x,k,c) (s(y,c) = word_in(x, c) ^ (k)[c])
#define so(y,x,c) word_out(y, c, s(x,c))
#if defined(ARRAYS)
#define locals(y,x) x[4],y[4]
#else
#define locals(y,x) x##0,x##1,x##2,x##3,y##0,y##1,y##2,y##3
#endif
#define l_copy(y, x) s(y,0) = s(x,0); s(y,1) = s(x,1); \
s(y,2) = s(x,2); s(y,3) = s(x,3);
#define state_in(y,x,k) si(y,x,k,0); si(y,x,k,1); si(y,x,k,2); si(y,x,k,3)
#define state_out(y,x) so(y,x,0); so(y,x,1); so(y,x,2); so(y,x,3)
#define round(rm,y,x,k) rm(y,x,k,0); rm(y,x,k,1); rm(y,x,k,2); rm(y,x,k,3)
#if defined(ENCRYPTION) && !defined(AES_ASM)
/* Visual C++ .Net v7.1 provides the fastest encryption code when using
Pentium optimiation with small code but this is poor for decryption
so we need to control this with the following VC++ pragmas
*/
#if defined(_MSC_VER)
#pragma optimize( "s", on )
#endif
/* Given the column (c) of the output state variable, the following
macros give the input state variables which are needed in its
computation for each row (r) of the state. All the alternative
macros give the same end values but expand into different ways
of calculating these values. In particular the complex macro
used for dynamically variable block sizes is designed to expand
to a compile time constant whenever possible but will expand to
conditional clauses on some branches (I am grateful to Frank
Yellin for this construction)
*/
#define fwd_var(x,r,c)\
( r == 0 ? ( c == 0 ? s(x,0) : c == 1 ? s(x,1) : c == 2 ? s(x,2) : s(x,3))\
: r == 1 ? ( c == 0 ? s(x,1) : c == 1 ? s(x,2) : c == 2 ? s(x,3) : s(x,0))\
: r == 2 ? ( c == 0 ? s(x,2) : c == 1 ? s(x,3) : c == 2 ? s(x,0) : s(x,1))\
: ( c == 0 ? s(x,3) : c == 1 ? s(x,0) : c == 2 ? s(x,1) : s(x,2)))
#if defined(FT4_SET)
#undef dec_fmvars
#define fwd_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ four_tables(x,t_use(f,n),fwd_var,rf1,c))
#elif defined(FT1_SET)
#undef dec_fmvars
#define fwd_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ one_table(x,upr,t_use(f,n),fwd_var,rf1,c))
#else
#define fwd_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ fwd_mcol(no_table(x,t_use(s,box),fwd_var,rf1,c)))
#endif
#if defined(FL4_SET)
#define fwd_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ four_tables(x,t_use(f,l),fwd_var,rf1,c))
#elif defined(FL1_SET)
#define fwd_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ one_table(x,ups,t_use(f,l),fwd_var,rf1,c))
#else
#define fwd_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ no_table(x,t_use(s,box),fwd_var,rf1,c))
#endif
2004-07-20 11:48:09 +00:00
aes_rval aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1])
{ aes_32t locals(b0, b1);
const aes_32t *kp;
#if defined( dec_fmvars )
dec_fmvars; /* declare variables for fwd_mcol() if needed */
#endif
2004-07-20 11:48:09 +00:00
#if defined( AES_ERR_CHK )
if( cx->inf.b[0] != 10 * 16 && cx->inf.b[0] != 12 * 16 && cx->inf.b[0] != 14 * 16 )
return aes_error;
#endif
2004-07-20 11:48:09 +00:00
kp = cx->ks;
state_in(b0, in, kp);
#if (ENC_UNROLL == FULL)
2004-07-20 11:48:09 +00:00
switch(cx->inf.b[0])
{
2004-07-20 11:48:09 +00:00
case 14 * 16:
round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
kp += 2 * N_COLS;
2004-07-20 11:48:09 +00:00
case 12 * 16:
round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
kp += 2 * N_COLS;
2004-07-20 11:48:09 +00:00
case 10 * 16:
round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
round(fwd_rnd, b1, b0, kp + 3 * N_COLS);
round(fwd_rnd, b0, b1, kp + 4 * N_COLS);
round(fwd_rnd, b1, b0, kp + 5 * N_COLS);
round(fwd_rnd, b0, b1, kp + 6 * N_COLS);
round(fwd_rnd, b1, b0, kp + 7 * N_COLS);
round(fwd_rnd, b0, b1, kp + 8 * N_COLS);
round(fwd_rnd, b1, b0, kp + 9 * N_COLS);
round(fwd_lrnd, b0, b1, kp +10 * N_COLS);
}
#else
#if (ENC_UNROLL == PARTIAL)
{ aes_32t rnd;
2004-07-20 11:48:09 +00:00
for(rnd = 0; rnd < (cx->inf.b[0] >> 5) - 1; ++rnd)
{
kp += N_COLS;
round(fwd_rnd, b1, b0, kp);
kp += N_COLS;
round(fwd_rnd, b0, b1, kp);
}
kp += N_COLS;
round(fwd_rnd, b1, b0, kp);
#else
{ aes_32t rnd;
2004-07-20 11:48:09 +00:00
for(rnd = 0; rnd < (cx->inf.b[0] >> 4) - 1; ++rnd)
{
kp += N_COLS;
round(fwd_rnd, b1, b0, kp);
2004-07-20 11:48:09 +00:00
l_copy(b0, b1);
}
#endif
kp += N_COLS;
round(fwd_lrnd, b0, b1, kp);
}
#endif
2004-07-20 11:48:09 +00:00
state_out(out, b0);
#if defined( AES_ERR_CHK )
return aes_good;
#endif
}
#endif
#if defined(DECRYPTION) && !defined(AES_ASM)
/* Visual C++ .Net v7.1 provides the fastest encryption code when using
Pentium optimiation with small code but this is poor for decryption
so we need to control this with the following VC++ pragmas
*/
#if defined(_MSC_VER)
#pragma optimize( "t", on )
#endif
/* Given the column (c) of the output state variable, the following
macros give the input state variables which are needed in its
computation for each row (r) of the state. All the alternative
macros give the same end values but expand into different ways
of calculating these values. In particular the complex macro
used for dynamically variable block sizes is designed to expand
to a compile time constant whenever possible but will expand to
conditional clauses on some branches (I am grateful to Frank
Yellin for this construction)
*/
#define inv_var(x,r,c)\
( r == 0 ? ( c == 0 ? s(x,0) : c == 1 ? s(x,1) : c == 2 ? s(x,2) : s(x,3))\
: r == 1 ? ( c == 0 ? s(x,3) : c == 1 ? s(x,0) : c == 2 ? s(x,1) : s(x,2))\
: r == 2 ? ( c == 0 ? s(x,2) : c == 1 ? s(x,3) : c == 2 ? s(x,0) : s(x,1))\
: ( c == 0 ? s(x,1) : c == 1 ? s(x,2) : c == 2 ? s(x,3) : s(x,0)))
#if defined(IT4_SET)
#undef dec_imvars
#define inv_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ four_tables(x,t_use(i,n),inv_var,rf1,c))
#elif defined(IT1_SET)
#undef dec_imvars
#define inv_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ one_table(x,upr,t_use(i,n),inv_var,rf1,c))
#else
#define inv_rnd(y,x,k,c) (s(y,c) = inv_mcol((k)[c] ^ no_table(x,t_use(i,box),inv_var,rf1,c)))
#endif
#if defined(IL4_SET)
#define inv_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ four_tables(x,t_use(i,l),inv_var,rf1,c))
#elif defined(IL1_SET)
#define inv_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ one_table(x,ups,t_use(i,l),inv_var,rf1,c))
#else
#define inv_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ no_table(x,t_use(i,box),inv_var,rf1,c))
#endif
2004-07-20 11:48:09 +00:00
/* This code can work with the decryption key schedule in the */
/* order as that used for encrytpion (where the 1st decryption */
/* round key is at the high end ot the schedule) or with a key */
/* schedule that has been reversed to put the 1st decryption */
/* round key at the low end of the schedule in memory (when */
/* AES_REV_DKS is defined) */
#ifdef AES_REV_DKS
#define key_ofs 0
#define rnd_key(n) (kp + n * N_COLS)
#else
#define key_ofs 1
#define rnd_key(n) (kp - n * N_COLS)
#endif
aes_rval aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1])
{ aes_32t locals(b0, b1);
2004-07-20 11:48:09 +00:00
#if defined( dec_imvars )
dec_imvars; /* declare variables for inv_mcol() if needed */
#endif
2004-07-20 11:48:09 +00:00
const aes_32t *kp;
2004-07-20 11:48:09 +00:00
#if defined( AES_ERR_CHK )
if( cx->inf.b[0] != 10 * 16 && cx->inf.b[0] != 12 * 16 && cx->inf.b[0] != 14 * 16 )
return aes_error;
#endif
2004-07-20 11:48:09 +00:00
kp = cx->ks + (key_ofs ? (cx->inf.b[0] >> 2) : 0);
state_in(b0, in, kp);
#if (DEC_UNROLL == FULL)
2004-07-20 11:48:09 +00:00
kp = cx->ks + (key_ofs ? 0 : (cx->inf.b[0] >> 2));
switch(cx->inf.b[0])
{
2004-07-20 11:48:09 +00:00
case 14 * 16:
round(inv_rnd, b1, b0, rnd_key(-13));
round(inv_rnd, b0, b1, rnd_key(-12));
case 12 * 16:
round(inv_rnd, b1, b0, rnd_key(-11));
round(inv_rnd, b0, b1, rnd_key(-10));
case 10 * 16:
round(inv_rnd, b1, b0, rnd_key(-9));
round(inv_rnd, b0, b1, rnd_key(-8));
round(inv_rnd, b1, b0, rnd_key(-7));
round(inv_rnd, b0, b1, rnd_key(-6));
round(inv_rnd, b1, b0, rnd_key(-5));
round(inv_rnd, b0, b1, rnd_key(-4));
round(inv_rnd, b1, b0, rnd_key(-3));
round(inv_rnd, b0, b1, rnd_key(-2));
round(inv_rnd, b1, b0, rnd_key(-1));
round(inv_lrnd, b0, b1, rnd_key( 0));
}
#else
#if (DEC_UNROLL == PARTIAL)
{ aes_32t rnd;
2004-07-20 11:48:09 +00:00
for(rnd = 0; rnd < (cx->inf.b[0] >> 5) - 1; ++rnd)
{
2004-07-20 11:48:09 +00:00
kp = rnd_key(1);
round(inv_rnd, b1, b0, kp);
2004-07-20 11:48:09 +00:00
kp = rnd_key(1);
round(inv_rnd, b0, b1, kp);
}
2004-07-20 11:48:09 +00:00
kp = rnd_key(1);
round(inv_rnd, b1, b0, kp);
#else
{ aes_32t rnd;
2004-07-20 11:48:09 +00:00
for(rnd = 0; rnd < (cx->inf.b[0] >> 4) - 1; ++rnd)
{
2004-07-20 11:48:09 +00:00
kp = rnd_key(1);
round(inv_rnd, b1, b0, kp);
2004-07-20 11:48:09 +00:00
l_copy(b0, b1);
}
#endif
2004-07-20 11:48:09 +00:00
kp = rnd_key(1);
round(inv_lrnd, b0, b1, kp);
2004-07-20 11:48:09 +00:00
}
#endif
2004-07-20 11:48:09 +00:00
state_out(out, b0);
#if defined( AES_ERR_CHK )
return aes_good;
#endif
}
#endif
#if defined(__cplusplus)
}
#endif