2 ---------------------------------------------------------------------------
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3 Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
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7 The redistribution and use of this software (with or without changes)
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8 is allowed without the payment of fees or royalties provided that:
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10 1. source code distributions include the above copyright notice, this
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11 list of conditions and the following disclaimer;
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13 2. binary distributions include the above copyright notice, this list
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14 of conditions and the following disclaimer in their documentation;
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16 3. the name of the copyright holder is not used to endorse products
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17 built using this software without specific written permission.
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21 This software is provided 'as is' with no explicit or implied warranties
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22 in respect of its properties, including, but not limited to, correctness
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23 and/or fitness for purpose.
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24 ---------------------------------------------------------------------------
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25 Issue Date: 20/12/2007
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31 #if defined(__cplusplus)
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36 #define si(y,x,k,c) (s(y,c) = word_in(x, c) ^ (k)[c])
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37 #define so(y,x,c) word_out(y, c, s(x,c))
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40 #define locals(y,x) x[4],y[4]
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42 #define locals(y,x) x##0,x##1,x##2,x##3,y##0,y##1,y##2,y##3
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45 #define l_copy(y, x) s(y,0) = s(x,0); s(y,1) = s(x,1); \
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46 s(y,2) = s(x,2); s(y,3) = s(x,3);
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47 #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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48 #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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49 #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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51 #if ( FUNCS_IN_C & ENCRYPTION_IN_C )
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53 /* Visual C++ .Net v7.1 provides the fastest encryption code when using
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54 Pentium optimiation with small code but this is poor for decryption
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55 so we need to control this with the following VC++ pragmas
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58 #if defined( _MSC_VER ) && !defined( _WIN64 )
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59 #pragma optimize( "s", on )
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62 /* Given the column (c) of the output state variable, the following
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63 macros give the input state variables which are needed in its
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64 computation for each row (r) of the state. All the alternative
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65 macros give the same end values but expand into different ways
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66 of calculating these values. In particular the complex macro
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67 used for dynamically variable block sizes is designed to expand
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68 to a compile time constant whenever possible but will expand to
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69 conditional clauses on some branches (I am grateful to Frank
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70 Yellin for this construction)
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73 #define fwd_var(x,r,c)\
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74 ( r == 0 ? ( c == 0 ? s(x,0) : c == 1 ? s(x,1) : c == 2 ? s(x,2) : s(x,3))\
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75 : r == 1 ? ( c == 0 ? s(x,1) : c == 1 ? s(x,2) : c == 2 ? s(x,3) : s(x,0))\
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76 : r == 2 ? ( c == 0 ? s(x,2) : c == 1 ? s(x,3) : c == 2 ? s(x,0) : s(x,1))\
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77 : ( c == 0 ? s(x,3) : c == 1 ? s(x,0) : c == 2 ? s(x,1) : s(x,2)))
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79 #if defined(FT4_SET)
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81 #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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82 #elif defined(FT1_SET)
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84 #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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86 #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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89 #if defined(FL4_SET)
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90 #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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91 #elif defined(FL1_SET)
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92 #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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94 #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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97 AES_RETURN aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1])
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98 { uint_32t locals(b0, b1);
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100 #if defined( dec_fmvars )
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101 dec_fmvars; /* declare variables for fwd_mcol() if needed */
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104 if( cx->inf.b[0] != 10 * 16 && cx->inf.b[0] != 12 * 16 && cx->inf.b[0] != 14 * 16 )
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105 return EXIT_FAILURE;
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108 state_in(b0, in, kp);
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110 #if (ENC_UNROLL == FULL)
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112 switch(cx->inf.b[0])
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115 round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
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116 round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
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119 round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
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120 round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
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123 round(fwd_rnd, b1, b0, kp + 1 * N_COLS);
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124 round(fwd_rnd, b0, b1, kp + 2 * N_COLS);
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125 round(fwd_rnd, b1, b0, kp + 3 * N_COLS);
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126 round(fwd_rnd, b0, b1, kp + 4 * N_COLS);
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127 round(fwd_rnd, b1, b0, kp + 5 * N_COLS);
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128 round(fwd_rnd, b0, b1, kp + 6 * N_COLS);
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129 round(fwd_rnd, b1, b0, kp + 7 * N_COLS);
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130 round(fwd_rnd, b0, b1, kp + 8 * N_COLS);
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131 round(fwd_rnd, b1, b0, kp + 9 * N_COLS);
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132 round(fwd_lrnd, b0, b1, kp +10 * N_COLS);
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137 #if (ENC_UNROLL == PARTIAL)
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139 for(rnd = 0; rnd < (cx->inf.b[0] >> 5) - 1; ++rnd)
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142 round(fwd_rnd, b1, b0, kp);
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144 round(fwd_rnd, b0, b1, kp);
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147 round(fwd_rnd, b1, b0, kp);
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150 for(rnd = 0; rnd < (cx->inf.b[0] >> 4) - 1; ++rnd)
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153 round(fwd_rnd, b1, b0, kp);
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158 round(fwd_lrnd, b0, b1, kp);
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162 state_out(out, b0);
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163 return EXIT_SUCCESS;
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168 #if ( FUNCS_IN_C & DECRYPTION_IN_C)
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170 /* Visual C++ .Net v7.1 provides the fastest encryption code when using
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171 Pentium optimiation with small code but this is poor for decryption
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172 so we need to control this with the following VC++ pragmas
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175 #if defined( _MSC_VER ) && !defined( _WIN64 )
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176 #pragma optimize( "t", on )
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179 /* Given the column (c) of the output state variable, the following
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180 macros give the input state variables which are needed in its
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181 computation for each row (r) of the state. All the alternative
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182 macros give the same end values but expand into different ways
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183 of calculating these values. In particular the complex macro
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184 used for dynamically variable block sizes is designed to expand
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185 to a compile time constant whenever possible but will expand to
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186 conditional clauses on some branches (I am grateful to Frank
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187 Yellin for this construction)
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190 #define inv_var(x,r,c)\
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191 ( r == 0 ? ( c == 0 ? s(x,0) : c == 1 ? s(x,1) : c == 2 ? s(x,2) : s(x,3))\
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192 : r == 1 ? ( c == 0 ? s(x,3) : c == 1 ? s(x,0) : c == 2 ? s(x,1) : s(x,2))\
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193 : r == 2 ? ( c == 0 ? s(x,2) : c == 1 ? s(x,3) : c == 2 ? s(x,0) : s(x,1))\
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194 : ( c == 0 ? s(x,1) : c == 1 ? s(x,2) : c == 2 ? s(x,3) : s(x,0)))
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196 #if defined(IT4_SET)
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198 #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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199 #elif defined(IT1_SET)
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201 #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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203 #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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206 #if defined(IL4_SET)
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207 #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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208 #elif defined(IL1_SET)
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209 #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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211 #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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214 /* This code can work with the decryption key schedule in the */
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215 /* order that is used for encrytpion (where the 1st decryption */
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216 /* round key is at the high end ot the schedule) or with a key */
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217 /* schedule that has been reversed to put the 1st decryption */
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218 /* round key at the low end of the schedule in memory (when */
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219 /* AES_REV_DKS is defined) */
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223 #define rnd_key(n) (kp + n * N_COLS)
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226 #define rnd_key(n) (kp - n * N_COLS)
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229 AES_RETURN aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1])
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230 { uint_32t locals(b0, b1);
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231 #if defined( dec_imvars )
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232 dec_imvars; /* declare variables for inv_mcol() if needed */
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234 const uint_32t *kp;
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236 if( cx->inf.b[0] != 10 * 16 && cx->inf.b[0] != 12 * 16 && cx->inf.b[0] != 14 * 16 )
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237 return EXIT_FAILURE;
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239 kp = cx->ks + (key_ofs ? (cx->inf.b[0] >> 2) : 0);
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240 state_in(b0, in, kp);
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242 #if (DEC_UNROLL == FULL)
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244 kp = cx->ks + (key_ofs ? 0 : (cx->inf.b[0] >> 2));
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245 switch(cx->inf.b[0])
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248 round(inv_rnd, b1, b0, rnd_key(-13));
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249 round(inv_rnd, b0, b1, rnd_key(-12));
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251 round(inv_rnd, b1, b0, rnd_key(-11));
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252 round(inv_rnd, b0, b1, rnd_key(-10));
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254 round(inv_rnd, b1, b0, rnd_key(-9));
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255 round(inv_rnd, b0, b1, rnd_key(-8));
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256 round(inv_rnd, b1, b0, rnd_key(-7));
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257 round(inv_rnd, b0, b1, rnd_key(-6));
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258 round(inv_rnd, b1, b0, rnd_key(-5));
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259 round(inv_rnd, b0, b1, rnd_key(-4));
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260 round(inv_rnd, b1, b0, rnd_key(-3));
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261 round(inv_rnd, b0, b1, rnd_key(-2));
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262 round(inv_rnd, b1, b0, rnd_key(-1));
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263 round(inv_lrnd, b0, b1, rnd_key( 0));
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268 #if (DEC_UNROLL == PARTIAL)
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270 for(rnd = 0; rnd < (cx->inf.b[0] >> 5) - 1; ++rnd)
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273 round(inv_rnd, b1, b0, kp);
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275 round(inv_rnd, b0, b1, kp);
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278 round(inv_rnd, b1, b0, kp);
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281 for(rnd = 0; rnd < (cx->inf.b[0] >> 4) - 1; ++rnd)
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284 round(inv_rnd, b1, b0, kp);
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289 round(inv_lrnd, b0, b1, kp);
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293 state_out(out, b0);
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294 return EXIT_SUCCESS;
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299 #if defined(__cplusplus)
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