mirror of
https://github.com/asterisk/asterisk.git
synced 2025-11-03 20:38:59 +00:00
4573b36af1
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@66071 65c4cc65-6c06-0410-ace0-fbb531ad65f3
322 lines
10 KiB
C
322 lines
10 KiB
C
/*
|
|
---------------------------------------------------------------------------
|
|
Copyright (c) 2003, Dr Brian Gladman <brg@gladman.me.uk>, 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.
|
|
---------------------------------------------------------------------------
|
|
Issue Date: 26/08/2003
|
|
|
|
*/
|
|
|
|
/*! \file
|
|
*
|
|
* \brief This file contains the code for implementing encryption and decryption
|
|
* for AES (Rijndael) for block and key sizes of 16, 24 and 32 bytes. It
|
|
* can optionally be replaced by code written in assembler using NASM. For
|
|
* further details see the file aesopt.h
|
|
*
|
|
* \author Dr Brian Gladman <brg@gladman.me.uk>
|
|
*/
|
|
|
|
#if defined(__cplusplus)
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
#ifndef HAVE_CRYPTO
|
|
|
|
#include "aesopt.h"
|
|
|
|
#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
|
|
|
|
aes_rval aes_encrypt(const void *in_blk, void *out_blk, const aes_encrypt_ctx cx[1])
|
|
{ aes_32t locals(b0, b1);
|
|
const aes_32t *kp = cx->ks;
|
|
#ifdef dec_fmvars
|
|
dec_fmvars; /* declare variables for fwd_mcol() if needed */
|
|
#endif
|
|
|
|
aes_32t nr = (kp[45] ^ kp[52] ^ kp[53] ? kp[52] : 14);
|
|
|
|
#ifdef AES_ERR_CHK
|
|
if( (nr != 10 || !(kp[0] | kp[3] | kp[4]))
|
|
&& (nr != 12 || !(kp[0] | kp[5] | kp[6]))
|
|
&& (nr != 14 || !(kp[0] | kp[7] | kp[8])) )
|
|
return aes_error;
|
|
#endif
|
|
|
|
state_in(b0, in_blk, kp);
|
|
|
|
#if (ENC_UNROLL == FULL)
|
|
|
|
switch(nr)
|
|
{
|
|
case 14:
|
|
round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
|
|
round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
|
|
kp += 2 * N_COLS;
|
|
case 12:
|
|
round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
|
|
round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
|
|
kp += 2 * N_COLS;
|
|
case 10:
|
|
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;
|
|
for(rnd = 0; rnd < (nr >> 1) - 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;
|
|
for(rnd = 0; rnd < nr - 1; ++rnd)
|
|
{
|
|
kp += N_COLS;
|
|
round(fwd_rnd, b1, b0, kp);
|
|
l_copy(b0, b1);
|
|
}
|
|
#endif
|
|
kp += N_COLS;
|
|
round(fwd_lrnd, b0, b1, kp);
|
|
}
|
|
#endif
|
|
|
|
state_out(out_blk, b0);
|
|
#ifdef 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
|
|
|
|
aes_rval aes_decrypt(const void *in_blk, void *out_blk, const aes_decrypt_ctx cx[1])
|
|
{ aes_32t locals(b0, b1);
|
|
#ifdef dec_imvars
|
|
dec_imvars; /* declare variables for inv_mcol() if needed */
|
|
#endif
|
|
|
|
aes_32t nr = (cx->ks[45] ^ cx->ks[52] ^ cx->ks[53] ? cx->ks[52] : 14);
|
|
const aes_32t *kp = cx->ks + nr * N_COLS;
|
|
|
|
#ifdef AES_ERR_CHK
|
|
if( (nr != 10 || !(cx->ks[0] | cx->ks[3] | cx->ks[4]))
|
|
&& (nr != 12 || !(cx->ks[0] | cx->ks[5] | cx->ks[6]))
|
|
&& (nr != 14 || !(cx->ks[0] | cx->ks[7] | cx->ks[8])) )
|
|
return aes_error;
|
|
#endif
|
|
|
|
state_in(b0, in_blk, kp);
|
|
|
|
#if (DEC_UNROLL == FULL)
|
|
|
|
switch(nr)
|
|
{
|
|
case 14:
|
|
round(inv_rnd, b1, b0, kp - 1 * N_COLS);
|
|
round(inv_rnd, b0, b1, kp - 2 * N_COLS);
|
|
kp -= 2 * N_COLS;
|
|
case 12:
|
|
round(inv_rnd, b1, b0, kp - 1 * N_COLS);
|
|
round(inv_rnd, b0, b1, kp - 2 * N_COLS);
|
|
kp -= 2 * N_COLS;
|
|
case 10:
|
|
round(inv_rnd, b1, b0, kp - 1 * N_COLS);
|
|
round(inv_rnd, b0, b1, kp - 2 * N_COLS);
|
|
round(inv_rnd, b1, b0, kp - 3 * N_COLS);
|
|
round(inv_rnd, b0, b1, kp - 4 * N_COLS);
|
|
round(inv_rnd, b1, b0, kp - 5 * N_COLS);
|
|
round(inv_rnd, b0, b1, kp - 6 * N_COLS);
|
|
round(inv_rnd, b1, b0, kp - 7 * N_COLS);
|
|
round(inv_rnd, b0, b1, kp - 8 * N_COLS);
|
|
round(inv_rnd, b1, b0, kp - 9 * N_COLS);
|
|
round(inv_lrnd, b0, b1, kp - 10 * N_COLS);
|
|
}
|
|
|
|
#else
|
|
|
|
#if (DEC_UNROLL == PARTIAL)
|
|
{ aes_32t rnd;
|
|
for(rnd = 0; rnd < (nr >> 1) - 1; ++rnd)
|
|
{
|
|
kp -= N_COLS;
|
|
round(inv_rnd, b1, b0, kp);
|
|
kp -= N_COLS;
|
|
round(inv_rnd, b0, b1, kp);
|
|
}
|
|
kp -= N_COLS;
|
|
round(inv_rnd, b1, b0, kp);
|
|
#else
|
|
{ aes_32t rnd;
|
|
for(rnd = 0; rnd < nr - 1; ++rnd)
|
|
{
|
|
kp -= N_COLS;
|
|
round(inv_rnd, b1, b0, kp);
|
|
l_copy(b0, b1);
|
|
}
|
|
#endif
|
|
kp -= N_COLS;
|
|
round(inv_lrnd, b0, b1, kp);
|
|
}
|
|
#endif
|
|
|
|
state_out(out_blk, b0);
|
|
#ifdef AES_ERR_CHK
|
|
return aes_good;
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* !HAVE_CRYPTO */
|
|
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|