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301 lines
10 KiB
301 lines
10 KiB
/*
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---------------------------------------------------------------------------
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Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
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LICENSE TERMS
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The redistribution and use of this software (with or without changes)
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is allowed without the payment of fees or royalties provided that:
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1. source code distributions include the above copyright notice, this
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list of conditions and the following disclaimer;
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2. binary distributions include the above copyright notice, this list
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of conditions and the following disclaimer in their documentation;
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3. the name of the copyright holder is not used to endorse products
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built using this software without specific written permission.
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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 Date: 20/12/2007
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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 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( 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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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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return EXIT_SUCCESS;
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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 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( 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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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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return EXIT_SUCCESS;
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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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