arch/x86/crypto/twofish-x86_64-asm

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   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /***************************************************************************
   3 *   Copyright (C) 2006 by Joachim Fritschi, <jfritschi@freenet.de>        *
   4 *                                                                         *
   5 ***************************************************************************/
   6 
   7 .file "twofish-x86_64-asm.S"
   8 .text
   9 
  10 #include <linux/linkage.h>
  11 #include <asm/asm-offsets.h>
  12 
  13 #define a_offset        0
  14 #define b_offset        4
  15 #define c_offset        8
  16 #define d_offset        12
  17 
  18 /* Structure of the crypto context struct*/
  19 
  20 #define s0      0       /* S0 Array 256 Words each */
  21 #define s1      1024    /* S1 Array */
  22 #define s2      2048    /* S2 Array */
  23 #define s3      3072    /* S3 Array */
  24 #define w       4096    /* 8 whitening keys (word) */
  25 #define k       4128    /* key 1-32 ( word ) */
  26 
  27 /* define a few register aliases to allow macro substitution */
  28 
  29 #define R0     %rax
  30 #define R0D    %eax
  31 #define R0B    %al
  32 #define R0H    %ah
  33 
  34 #define R1     %rbx
  35 #define R1D    %ebx
  36 #define R1B    %bl
  37 #define R1H    %bh
  38 
  39 #define R2     %rcx
  40 #define R2D    %ecx
  41 #define R2B    %cl
  42 #define R2H    %ch
  43 
  44 #define R3     %rdx
  45 #define R3D    %edx
  46 #define R3B    %dl
  47 #define R3H    %dh
  48 
  49 
  50 /* performs input whitening */
  51 #define input_whitening(src,context,offset)\
  52         xor     w+offset(context),      src;
  53 
  54 /* performs input whitening */
  55 #define output_whitening(src,context,offset)\
  56         xor     w+16+offset(context),   src;
  57 
  58 
  59 /*
  60  * a input register containing a (rotated 16)
  61  * b input register containing b
  62  * c input register containing c
  63  * d input register containing d (already rol $1)
  64  * operations on a and b are interleaved to increase performance
  65  */
  66 #define encrypt_round(a,b,c,d,round)\
  67         movzx   b ## B,         %edi;\
  68         mov     s1(%r11,%rdi,4),%r8d;\
  69         movzx   a ## B,         %edi;\
  70         mov     s2(%r11,%rdi,4),%r9d;\
  71         movzx   b ## H,         %edi;\
  72         ror     $16,            b ## D;\
  73         xor     s2(%r11,%rdi,4),%r8d;\
  74         movzx   a ## H,         %edi;\
  75         ror     $16,            a ## D;\
  76         xor     s3(%r11,%rdi,4),%r9d;\
  77         movzx   b ## B,         %edi;\
  78         xor     s3(%r11,%rdi,4),%r8d;\
  79         movzx   a ## B,         %edi;\
  80         xor     (%r11,%rdi,4),  %r9d;\
  81         movzx   b ## H,         %edi;\
  82         ror     $15,            b ## D;\
  83         xor     (%r11,%rdi,4),  %r8d;\
  84         movzx   a ## H,         %edi;\
  85         xor     s1(%r11,%rdi,4),%r9d;\
  86         add     %r8d,           %r9d;\
  87         add     %r9d,           %r8d;\
  88         add     k+round(%r11),  %r9d;\
  89         xor     %r9d,           c ## D;\
  90         rol     $15,            c ## D;\
  91         add     k+4+round(%r11),%r8d;\
  92         xor     %r8d,           d ## D;
  93 
  94 /*
  95  * a input register containing a(rotated 16)
  96  * b input register containing b
  97  * c input register containing c
  98  * d input register containing d (already rol $1)
  99  * operations on a and b are interleaved to increase performance
 100  * during the round a and b are prepared for the output whitening
 101  */
 102 #define encrypt_last_round(a,b,c,d,round)\
 103         mov     b ## D,         %r10d;\
 104         shl     $32,            %r10;\
 105         movzx   b ## B,         %edi;\
 106         mov     s1(%r11,%rdi,4),%r8d;\
 107         movzx   a ## B,         %edi;\
 108         mov     s2(%r11,%rdi,4),%r9d;\
 109         movzx   b ## H,         %edi;\
 110         ror     $16,            b ## D;\
 111         xor     s2(%r11,%rdi,4),%r8d;\
 112         movzx   a ## H,         %edi;\
 113         ror     $16,            a ## D;\
 114         xor     s3(%r11,%rdi,4),%r9d;\
 115         movzx   b ## B,         %edi;\
 116         xor     s3(%r11,%rdi,4),%r8d;\
 117         movzx   a ## B,         %edi;\
 118         xor     (%r11,%rdi,4),  %r9d;\
 119         xor     a,              %r10;\
 120         movzx   b ## H,         %edi;\
 121         xor     (%r11,%rdi,4),  %r8d;\
 122         movzx   a ## H,         %edi;\
 123         xor     s1(%r11,%rdi,4),%r9d;\
 124         add     %r8d,           %r9d;\
 125         add     %r9d,           %r8d;\
 126         add     k+round(%r11),  %r9d;\
 127         xor     %r9d,           c ## D;\
 128         ror     $1,             c ## D;\
 129         add     k+4+round(%r11),%r8d;\
 130         xor     %r8d,           d ## D
 131 
 132 /*
 133  * a input register containing a
 134  * b input register containing b (rotated 16)
 135  * c input register containing c (already rol $1)
 136  * d input register containing d
 137  * operations on a and b are interleaved to increase performance
 138  */
 139 #define decrypt_round(a,b,c,d,round)\
 140         movzx   a ## B,         %edi;\
 141         mov     (%r11,%rdi,4),  %r9d;\
 142         movzx   b ## B,         %edi;\
 143         mov     s3(%r11,%rdi,4),%r8d;\
 144         movzx   a ## H,         %edi;\
 145         ror     $16,            a ## D;\
 146         xor     s1(%r11,%rdi,4),%r9d;\
 147         movzx   b ## H,         %edi;\
 148         ror     $16,            b ## D;\
 149         xor     (%r11,%rdi,4),  %r8d;\
 150         movzx   a ## B,         %edi;\
 151         xor     s2(%r11,%rdi,4),%r9d;\
 152         movzx   b ## B,         %edi;\
 153         xor     s1(%r11,%rdi,4),%r8d;\
 154         movzx   a ## H,         %edi;\
 155         ror     $15,            a ## D;\
 156         xor     s3(%r11,%rdi,4),%r9d;\
 157         movzx   b ## H,         %edi;\
 158         xor     s2(%r11,%rdi,4),%r8d;\
 159         add     %r8d,           %r9d;\
 160         add     %r9d,           %r8d;\
 161         add     k+round(%r11),  %r9d;\
 162         xor     %r9d,           c ## D;\
 163         add     k+4+round(%r11),%r8d;\
 164         xor     %r8d,           d ## D;\
 165         rol     $15,            d ## D;
 166 
 167 /*
 168  * a input register containing a
 169  * b input register containing b
 170  * c input register containing c (already rol $1)
 171  * d input register containing d
 172  * operations on a and b are interleaved to increase performance
 173  * during the round a and b are prepared for the output whitening
 174  */
 175 #define decrypt_last_round(a,b,c,d,round)\
 176         movzx   a ## B,         %edi;\
 177         mov     (%r11,%rdi,4),  %r9d;\
 178         movzx   b ## B,         %edi;\
 179         mov     s3(%r11,%rdi,4),%r8d;\
 180         movzx   b ## H,         %edi;\
 181         ror     $16,            b ## D;\
 182         xor     (%r11,%rdi,4),  %r8d;\
 183         movzx   a ## H,         %edi;\
 184         mov     b ## D,         %r10d;\
 185         shl     $32,            %r10;\
 186         xor     a,              %r10;\
 187         ror     $16,            a ## D;\
 188         xor     s1(%r11,%rdi,4),%r9d;\
 189         movzx   b ## B,         %edi;\
 190         xor     s1(%r11,%rdi,4),%r8d;\
 191         movzx   a ## B,         %edi;\
 192         xor     s2(%r11,%rdi,4),%r9d;\
 193         movzx   b ## H,         %edi;\
 194         xor     s2(%r11,%rdi,4),%r8d;\
 195         movzx   a ## H,         %edi;\
 196         xor     s3(%r11,%rdi,4),%r9d;\
 197         add     %r8d,           %r9d;\
 198         add     %r9d,           %r8d;\
 199         add     k+round(%r11),  %r9d;\
 200         xor     %r9d,           c ## D;\
 201         add     k+4+round(%r11),%r8d;\
 202         xor     %r8d,           d ## D;\
 203         ror     $1,             d ## D;
 204 
 205 ENTRY(twofish_enc_blk)
 206         pushq    R1
 207 
 208         /* %rdi contains the ctx address */
 209         /* %rsi contains the output address */
 210         /* %rdx contains the input address */
 211         /* ctx address is moved to free one non-rex register
 212         as target for the 8bit high operations */
 213         mov     %rdi,           %r11
 214 
 215         movq    (R3),   R1
 216         movq    8(R3),  R3
 217         input_whitening(R1,%r11,a_offset)
 218         input_whitening(R3,%r11,c_offset)
 219         mov     R1D,    R0D
 220         rol     $16,    R0D
 221         shr     $32,    R1
 222         mov     R3D,    R2D
 223         shr     $32,    R3
 224         rol     $1,     R3D
 225 
 226         encrypt_round(R0,R1,R2,R3,0);
 227         encrypt_round(R2,R3,R0,R1,8);
 228         encrypt_round(R0,R1,R2,R3,2*8);
 229         encrypt_round(R2,R3,R0,R1,3*8);
 230         encrypt_round(R0,R1,R2,R3,4*8);
 231         encrypt_round(R2,R3,R0,R1,5*8);
 232         encrypt_round(R0,R1,R2,R3,6*8);
 233         encrypt_round(R2,R3,R0,R1,7*8);
 234         encrypt_round(R0,R1,R2,R3,8*8);
 235         encrypt_round(R2,R3,R0,R1,9*8);
 236         encrypt_round(R0,R1,R2,R3,10*8);
 237         encrypt_round(R2,R3,R0,R1,11*8);
 238         encrypt_round(R0,R1,R2,R3,12*8);
 239         encrypt_round(R2,R3,R0,R1,13*8);
 240         encrypt_round(R0,R1,R2,R3,14*8);
 241         encrypt_last_round(R2,R3,R0,R1,15*8);
 242 
 243 
 244         output_whitening(%r10,%r11,a_offset)
 245         movq    %r10,   (%rsi)
 246 
 247         shl     $32,    R1
 248         xor     R0,     R1
 249 
 250         output_whitening(R1,%r11,c_offset)
 251         movq    R1,     8(%rsi)
 252 
 253         popq    R1
 254         movl    $1,%eax
 255         ret
 256 ENDPROC(twofish_enc_blk)
 257 
 258 ENTRY(twofish_dec_blk)
 259         pushq    R1
 260 
 261         /* %rdi contains the ctx address */
 262         /* %rsi contains the output address */
 263         /* %rdx contains the input address */
 264         /* ctx address is moved to free one non-rex register
 265         as target for the 8bit high operations */
 266         mov     %rdi,           %r11
 267 
 268         movq    (R3),   R1
 269         movq    8(R3),  R3
 270         output_whitening(R1,%r11,a_offset)
 271         output_whitening(R3,%r11,c_offset)
 272         mov     R1D,    R0D
 273         shr     $32,    R1
 274         rol     $16,    R1D
 275         mov     R3D,    R2D
 276         shr     $32,    R3
 277         rol     $1,     R2D
 278 
 279         decrypt_round(R0,R1,R2,R3,15*8);
 280         decrypt_round(R2,R3,R0,R1,14*8);
 281         decrypt_round(R0,R1,R2,R3,13*8);
 282         decrypt_round(R2,R3,R0,R1,12*8);
 283         decrypt_round(R0,R1,R2,R3,11*8);
 284         decrypt_round(R2,R3,R0,R1,10*8);
 285         decrypt_round(R0,R1,R2,R3,9*8);
 286         decrypt_round(R2,R3,R0,R1,8*8);
 287         decrypt_round(R0,R1,R2,R3,7*8);
 288         decrypt_round(R2,R3,R0,R1,6*8);
 289         decrypt_round(R0,R1,R2,R3,5*8);
 290         decrypt_round(R2,R3,R0,R1,4*8);
 291         decrypt_round(R0,R1,R2,R3,3*8);
 292         decrypt_round(R2,R3,R0,R1,2*8);
 293         decrypt_round(R0,R1,R2,R3,1*8);
 294         decrypt_last_round(R2,R3,R0,R1,0);
 295 
 296         input_whitening(%r10,%r11,a_offset)
 297         movq    %r10,   (%rsi)
 298 
 299         shl     $32,    R1
 300         xor     R0,     R1
 301 
 302         input_whitening(R1,%r11,c_offset)
 303         movq    R1,     8(%rsi)
 304 
 305         popq    R1
 306         movl    $1,%eax
 307         ret
 308 ENDPROC(twofish_dec_blk)
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root/arch/x86/crypto/twofish-x86_64-asm_64.S
