mirror of
https://github.com/signalwire/freeswitch.git
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d2edcad66e
Thanks to Phil Zimmermann for the code and for the license exception we needed to include it. There remains some build system integration work to be done before this code will build properly in the FreeSWITCH tree.
317 lines
10 KiB
C
317 lines
10 KiB
C
/*
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---------------------------------------------------------------------------
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Copyright (c) 1998-2006, Brian Gladman, Worcester, UK. All rights reserved.
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LICENSE TERMS
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The free distribution and use of this software in both source and binary
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form is allowed (with or without changes) provided that:
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1. distributions of this source code include the above copyright
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notice, this list of conditions and the following disclaimer;
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2. distributions in binary form include the above copyright
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notice, this list of conditions and the following disclaimer
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in the documentation and/or other associated materials;
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3. the copyright holder's name is not used to endorse products
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built using this software without specific written permission.
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ALTERNATIVELY, provided that this notice is retained in full, this product
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may be distributed under the terms of the GNU General Public License (GPL),
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in which case the provisions of the GPL apply INSTEAD OF those given above.
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DISCLAIMER
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This software is provided 'as is' with no explicit or implied warranties
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in respect of its properties, including, but not limited to, correctness
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and/or fitness for purpose.
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---------------------------------------------------------------------------
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Issue 09/09/2006
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*/
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#include "aesopt.h"
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#include "aestab.h"
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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#define si(y,x,k,c) (s(y,c) = word_in(x, c) ^ (k)[c])
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#define so(y,x,c) word_out(y, c, s(x,c))
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#if defined(ARRAYS)
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#define locals(y,x) x[4],y[4]
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#else
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#define locals(y,x) x##0,x##1,x##2,x##3,y##0,y##1,y##2,y##3
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#endif
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#define l_copy(y, x) s(y,0) = s(x,0); s(y,1) = s(x,1); \
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s(y,2) = s(x,2); s(y,3) = s(x,3);
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#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)
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#define state_out(y,x) so(y,x,0); so(y,x,1); so(y,x,2); so(y,x,3)
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#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)
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#if ( FUNCS_IN_C & ENCRYPTION_IN_C )
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/* Visual C++ .Net v7.1 provides the fastest encryption code when using
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Pentium optimiation with small code but this is poor for decryption
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so we need to control this with the following VC++ pragmas
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*/
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#if defined( _MSC_VER ) && !defined( _WIN64 )
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#pragma optimize( "s", on )
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#endif
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/* Given the column (c) of the output state variable, the following
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macros give the input state variables which are needed in its
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computation for each row (r) of the state. All the alternative
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macros give the same end values but expand into different ways
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of calculating these values. In particular the complex macro
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used for dynamically variable block sizes is designed to expand
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to a compile time constant whenever possible but will expand to
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conditional clauses on some branches (I am grateful to Frank
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Yellin for this construction)
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*/
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#define fwd_var(x,r,c)\
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( r == 0 ? ( c == 0 ? s(x,0) : c == 1 ? s(x,1) : c == 2 ? s(x,2) : s(x,3))\
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: r == 1 ? ( c == 0 ? s(x,1) : c == 1 ? s(x,2) : c == 2 ? s(x,3) : s(x,0))\
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: r == 2 ? ( c == 0 ? s(x,2) : c == 1 ? s(x,3) : c == 2 ? s(x,0) : s(x,1))\
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: ( c == 0 ? s(x,3) : c == 1 ? s(x,0) : c == 2 ? s(x,1) : s(x,2)))
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#if defined(FT4_SET)
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#undef dec_fmvars
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#define fwd_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ four_tables(x,t_use(f,n),fwd_var,rf1,c))
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#elif defined(FT1_SET)
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#undef dec_fmvars
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#define fwd_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ one_table(x,upr,t_use(f,n),fwd_var,rf1,c))
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#else
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#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)))
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#endif
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#if defined(FL4_SET)
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#define fwd_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ four_tables(x,t_use(f,l),fwd_var,rf1,c))
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#elif defined(FL1_SET)
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#define fwd_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ one_table(x,ups,t_use(f,l),fwd_var,rf1,c))
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#else
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#define fwd_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ no_table(x,t_use(s,box),fwd_var,rf1,c))
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#endif
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AES_RETURN zrtp_bg_aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1])
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{ uint_32t locals(b0, b1);
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const uint_32t *kp;
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#if defined( dec_fmvars )
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dec_fmvars; /* declare variables for fwd_mcol() if needed */
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#endif
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#if defined( AES_ERR_CHK )
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if( cx->inf.b[0] != 10 * 16 && cx->inf.b[0] != 12 * 16 && cx->inf.b[0] != 14 * 16 )
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return EXIT_FAILURE;
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#endif
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kp = cx->ks;
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state_in(b0, in, kp);
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#if (ENC_UNROLL == FULL)
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switch(cx->inf.b[0])
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{
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case 14 * 16:
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round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
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round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
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kp += 2 * N_COLS;
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case 12 * 16:
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round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
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round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
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kp += 2 * N_COLS;
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case 10 * 16:
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round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
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round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
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round(fwd_rnd, b1, b0, kp + 3 * N_COLS);
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round(fwd_rnd, b0, b1, kp + 4 * N_COLS);
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round(fwd_rnd, b1, b0, kp + 5 * N_COLS);
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round(fwd_rnd, b0, b1, kp + 6 * N_COLS);
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round(fwd_rnd, b1, b0, kp + 7 * N_COLS);
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round(fwd_rnd, b0, b1, kp + 8 * N_COLS);
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round(fwd_rnd, b1, b0, kp + 9 * N_COLS);
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round(fwd_lrnd, b0, b1, kp +10 * N_COLS);
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}
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#else
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#if (ENC_UNROLL == PARTIAL)
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{ uint_32t rnd;
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for(rnd = 0; rnd < (cx->inf.b[0] >> 5) - 1; ++rnd)
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{
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kp += N_COLS;
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round(fwd_rnd, b1, b0, kp);
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kp += N_COLS;
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round(fwd_rnd, b0, b1, kp);
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}
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kp += N_COLS;
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round(fwd_rnd, b1, b0, kp);
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#else
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{ uint_32t rnd;
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for(rnd = 0; rnd < (cx->inf.b[0] >> 4) - 1; ++rnd)
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{
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kp += N_COLS;
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round(fwd_rnd, b1, b0, kp);
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l_copy(b0, b1);
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}
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#endif
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kp += N_COLS;
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round(fwd_lrnd, b0, b1, kp);
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}
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#endif
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state_out(out, b0);
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#if defined( AES_ERR_CHK )
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return EXIT_SUCCESS;
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#endif
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}
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#endif
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#if ( FUNCS_IN_C & DECRYPTION_IN_C)
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/* Visual C++ .Net v7.1 provides the fastest encryption code when using
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Pentium optimiation with small code but this is poor for decryption
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so we need to control this with the following VC++ pragmas
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*/
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#if defined( _MSC_VER ) && !defined( _WIN64 )
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#pragma optimize( "t", on )
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#endif
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/* Given the column (c) of the output state variable, the following
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macros give the input state variables which are needed in its
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computation for each row (r) of the state. All the alternative
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macros give the same end values but expand into different ways
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of calculating these values. In particular the complex macro
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used for dynamically variable block sizes is designed to expand
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to a compile time constant whenever possible but will expand to
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conditional clauses on some branches (I am grateful to Frank
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Yellin for this construction)
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*/
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#define inv_var(x,r,c)\
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( r == 0 ? ( c == 0 ? s(x,0) : c == 1 ? s(x,1) : c == 2 ? s(x,2) : s(x,3))\
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: r == 1 ? ( c == 0 ? s(x,3) : c == 1 ? s(x,0) : c == 2 ? s(x,1) : s(x,2))\
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: r == 2 ? ( c == 0 ? s(x,2) : c == 1 ? s(x,3) : c == 2 ? s(x,0) : s(x,1))\
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: ( c == 0 ? s(x,1) : c == 1 ? s(x,2) : c == 2 ? s(x,3) : s(x,0)))
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#if defined(IT4_SET)
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#undef dec_imvars
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#define inv_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ four_tables(x,t_use(i,n),inv_var,rf1,c))
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#elif defined(IT1_SET)
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#undef dec_imvars
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#define inv_rnd(y,x,k,c) (s(y,c) = (k)[c] ^ one_table(x,upr,t_use(i,n),inv_var,rf1,c))
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#else
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#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)))
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#endif
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#if defined(IL4_SET)
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#define inv_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ four_tables(x,t_use(i,l),inv_var,rf1,c))
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#elif defined(IL1_SET)
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#define inv_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ one_table(x,ups,t_use(i,l),inv_var,rf1,c))
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#else
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#define inv_lrnd(y,x,k,c) (s(y,c) = (k)[c] ^ no_table(x,t_use(i,box),inv_var,rf1,c))
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#endif
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/* This code can work with the decryption key schedule in the */
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/* order that is used for encrytpion (where the 1st decryption */
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/* round key is at the high end ot the schedule) or with a key */
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/* schedule that has been reversed to put the 1st decryption */
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/* round key at the low end of the schedule in memory (when */
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/* AES_REV_DKS is defined) */
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#ifdef AES_REV_DKS
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#define key_ofs 0
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#define rnd_key(n) (kp + n * N_COLS)
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#else
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#define key_ofs 1
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#define rnd_key(n) (kp - n * N_COLS)
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#endif
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AES_RETURN zrtp_bg_aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1])
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{ uint_32t locals(b0, b1);
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#if defined( dec_imvars )
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dec_imvars; /* declare variables for inv_mcol() if needed */
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#endif
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const uint_32t *kp;
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#if defined( AES_ERR_CHK )
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if( cx->inf.b[0] != 10 * 16 && cx->inf.b[0] != 12 * 16 && cx->inf.b[0] != 14 * 16 )
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return EXIT_FAILURE;
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#endif
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kp = cx->ks + (key_ofs ? (cx->inf.b[0] >> 2) : 0);
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state_in(b0, in, kp);
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#if (DEC_UNROLL == FULL)
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kp = cx->ks + (key_ofs ? 0 : (cx->inf.b[0] >> 2));
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switch(cx->inf.b[0])
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{
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case 14 * 16:
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round(inv_rnd, b1, b0, rnd_key(-13));
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round(inv_rnd, b0, b1, rnd_key(-12));
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case 12 * 16:
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round(inv_rnd, b1, b0, rnd_key(-11));
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round(inv_rnd, b0, b1, rnd_key(-10));
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case 10 * 16:
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round(inv_rnd, b1, b0, rnd_key(-9));
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round(inv_rnd, b0, b1, rnd_key(-8));
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round(inv_rnd, b1, b0, rnd_key(-7));
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round(inv_rnd, b0, b1, rnd_key(-6));
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round(inv_rnd, b1, b0, rnd_key(-5));
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round(inv_rnd, b0, b1, rnd_key(-4));
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round(inv_rnd, b1, b0, rnd_key(-3));
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round(inv_rnd, b0, b1, rnd_key(-2));
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round(inv_rnd, b1, b0, rnd_key(-1));
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round(inv_lrnd, b0, b1, rnd_key( 0));
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}
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#else
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#if (DEC_UNROLL == PARTIAL)
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{ uint_32t rnd;
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for(rnd = 0; rnd < (cx->inf.b[0] >> 5) - 1; ++rnd)
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{
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kp = rnd_key(1);
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round(inv_rnd, b1, b0, kp);
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kp = rnd_key(1);
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round(inv_rnd, b0, b1, kp);
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}
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kp = rnd_key(1);
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round(inv_rnd, b1, b0, kp);
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#else
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{ uint_32t rnd;
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for(rnd = 0; rnd < (cx->inf.b[0] >> 4) - 1; ++rnd)
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{
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kp = rnd_key(1);
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round(inv_rnd, b1, b0, kp);
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l_copy(b0, b1);
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}
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#endif
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kp = rnd_key(1);
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round(inv_lrnd, b0, b1, kp);
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}
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#endif
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state_out(out, b0);
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#if defined( AES_ERR_CHK )
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return EXIT_SUCCESS;
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#endif
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}
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#endif
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#if defined(__cplusplus)
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}
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#endif
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