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   1 /* AES (Rijndael) implementation (FIPS PUB 197) for x86_64
   2  *
   3  * Copyright (C) 2005 Andreas Steinmetz, <ast@domdv.de>
   4  *
   5  * License:
   6  * This code can be distributed under the terms of the GNU General Public
   7  * License (GPL) Version 2 provided that the above header down to and
   8  * including this sentence is retained in full.
   9  */
  10
  11 .extern aes_ft_tab
  12 .extern aes_it_tab
  13 .extern aes_fl_tab
  14 .extern aes_il_tab
  15
  16 .text
  17
  18 #define R1      %rax
  19 #define R1E     %eax
  20 #define R1X     %ax
  21 #define R1H     %ah
  22 #define R1L     %al
  23 #define R2      %rbx
  24 #define R2E     %ebx
  25 #define R2X     %bx
  26 #define R2H     %bh
  27 #define R2L     %bl
  28 #define R3      %rcx
  29 #define R3E     %ecx
  30 #define R3X     %cx
  31 #define R3H     %ch
  32 #define R3L     %cl
  33 #define R4      %rdx
  34 #define R4E     %edx
  35 #define R4X     %dx
  36 #define R4H     %dh
  37 #define R4L     %dl
  38 #define R5      %rsi
  39 #define R5E     %esi
  40 #define R6      %rdi
  41 #define R6E     %edi
  42 #define R7      %rbp
  43 #define R7E     %ebp
  44 #define R8      %r8
  45 #define R9      %r9
  46 #define R10     %r10
  47 #define R11     %r11
  48
  49 #define prologue(FUNC,BASE,B128,B192,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11) \
  50         .global FUNC;                   \
  51         .type   FUNC,@function;         \
  52         .align  8;                      \
  53 FUNC:   movq    r1,r2;                  \
  54         movq    r3,r4;                  \
  55         leaq    BASE+52(r8),r9;         \
  56         movq    r10,r11;                \
  57         movl    (r7),r5 ## E;           \
  58         movl    4(r7),r1 ## E;          \
  59         movl    8(r7),r6 ## E;          \
  60         movl    12(r7),r7 ## E;         \
  61         movl    (r8),r10 ## E;          \
  62         xorl    -48(r9),r5 ## E;        \
  63         xorl    -44(r9),r1 ## E;        \
  64         xorl    -40(r9),r6 ## E;        \
  65         xorl    -36(r9),r7 ## E;        \
  66         cmpl    $24,r10 ## E;           \
  67         jb      B128;                   \
  68         leaq    32(r9),r9;              \
  69         je      B192;                   \
  70         leaq    32(r9),r9;
  71
  72 #define epilogue(r1,r2,r3,r4,r5,r6,r7,r8,r9) \
  73         movq    r1,r2;                  \
  74         movq    r3,r4;                  \
  75         movl    r5 ## E,(r9);           \
  76         movl    r6 ## E,4(r9);          \
  77         movl    r7 ## E,8(r9);          \
  78         movl    r8 ## E,12(r9);         \
  79         ret;
  80
  81 #define round(TAB,OFFSET,r1,r2,r3,r4,r5,r6,r7,r8,ra,rb,rc,rd) \
  82         movzbl  r2 ## H,r5 ## E;        \
  83         movzbl  r2 ## L,r6 ## E;        \
  84         movl    TAB+1024(,r5,4),r5 ## E;\
  85         movw    r4 ## X,r2 ## X;        \
  86         movl    TAB(,r6,4),r6 ## E;     \
  87         roll    $16,r2 ## E;            \
  88         shrl    $16,r4 ## E;            \
  89         movzbl  r4 ## H,r7 ## E;        \
  90         movzbl  r4 ## L,r4 ## E;        \
  91         xorl    OFFSET(r8),ra ## E;     \
  92         xorl    OFFSET+4(r8),rb ## E;   \
  93         xorl    TAB+3072(,r7,4),r5 ## E;\
  94         xorl    TAB+2048(,r4,4),r6 ## E;\
  95         movzbl  r1 ## L,r7 ## E;        \
  96         movzbl  r1 ## H,r4 ## E;        \
  97         movl    TAB+1024(,r4,4),r4 ## E;\
  98         movw    r3 ## X,r1 ## X;        \
  99         roll    $16,r1 ## E;            \
 100         shrl    $16,r3 ## E;            \
 101         xorl    TAB(,r7,4),r5 ## E;     \
 102         movzbl  r3 ## H,r7 ## E;        \
 103         movzbl  r3 ## L,r3 ## E;        \
 104         xorl    TAB+3072(,r7,4),r4 ## E;\
 105         xorl    TAB+2048(,r3,4),r5 ## E;\
 106         movzbl  r1 ## H,r7 ## E;        \
 107         movzbl  r1 ## L,r3 ## E;        \
 108         shrl    $16,r1 ## E;            \
 109         xorl    TAB+3072(,r7,4),r6 ## E;\
 110         movl    TAB+2048(,r3,4),r3 ## E;\
 111         movzbl  r1 ## H,r7 ## E;        \
 112         movzbl  r1 ## L,r1 ## E;        \
 113         xorl    TAB+1024(,r7,4),r6 ## E;\
 114         xorl    TAB(,r1,4),r3 ## E;     \
 115         movzbl  r2 ## H,r1 ## E;        \
 116         movzbl  r2 ## L,r7 ## E;        \
 117         shrl    $16,r2 ## E;            \
 118         xorl    TAB+3072(,r1,4),r3 ## E;\
 119         xorl    TAB+2048(,r7,4),r4 ## E;\
 120         movzbl  r2 ## H,r1 ## E;        \
 121         movzbl  r2 ## L,r2 ## E;        \
 122         xorl    OFFSET+8(r8),rc ## E;   \
 123         xorl    OFFSET+12(r8),rd ## E;  \
 124         xorl    TAB+1024(,r1,4),r3 ## E;\
 125         xorl    TAB(,r2,4),r4 ## E;
 126
 127 #define move_regs(r1,r2,r3,r4) \
 128         movl    r3 ## E,r1 ## E;        \
 129         movl    r4 ## E,r2 ## E;
 130
 131 #define entry(FUNC,BASE,B128,B192) \
 132         prologue(FUNC,BASE,B128,B192,R2,R8,R7,R9,R1,R3,R4,R6,R10,R5,R11)
 133
 134 #define return epilogue(R8,R2,R9,R7,R5,R6,R3,R4,R11)
 135
 136 #define encrypt_round(TAB,OFFSET) \
 137         round(TAB,OFFSET,R1,R2,R3,R4,R5,R6,R7,R10,R5,R6,R3,R4) \
 138         move_regs(R1,R2,R5,R6)
 139
 140 #define encrypt_final(TAB,OFFSET) \
 141         round(TAB,OFFSET,R1,R2,R3,R4,R5,R6,R7,R10,R5,R6,R3,R4)
 142
 143 #define decrypt_round(TAB,OFFSET) \
 144         round(TAB,OFFSET,R2,R1,R4,R3,R6,R5,R7,R10,R5,R6,R3,R4) \
 145         move_regs(R1,R2,R5,R6)
 146
 147 #define decrypt_final(TAB,OFFSET) \
 148         round(TAB,OFFSET,R2,R1,R4,R3,R6,R5,R7,R10,R5,R6,R3,R4)
 149
 150 /* void aes_encrypt(void *ctx, u8 *out, const u8 *in) */
 151
 152         entry(aes_encrypt,0,enc128,enc192)
 153         encrypt_round(aes_ft_tab,-96)
 154         encrypt_round(aes_ft_tab,-80)
 155 enc192: encrypt_round(aes_ft_tab,-64)
 156         encrypt_round(aes_ft_tab,-48)
 157 enc128: encrypt_round(aes_ft_tab,-32)
 158         encrypt_round(aes_ft_tab,-16)
 159         encrypt_round(aes_ft_tab,  0)
 160         encrypt_round(aes_ft_tab, 16)
 161         encrypt_round(aes_ft_tab, 32)
 162         encrypt_round(aes_ft_tab, 48)
 163         encrypt_round(aes_ft_tab, 64)
 164         encrypt_round(aes_ft_tab, 80)
 165         encrypt_round(aes_ft_tab, 96)
 166         encrypt_final(aes_fl_tab,112)
 167         return
 168
 169 /* void aes_decrypt(void *ctx, u8 *out, const u8 *in) */
 170
 171         entry(aes_decrypt,240,dec128,dec192)
 172         decrypt_round(aes_it_tab,-96)
 173         decrypt_round(aes_it_tab,-80)
 174 dec192: decrypt_round(aes_it_tab,-64)
 175         decrypt_round(aes_it_tab,-48)
 176 dec128: decrypt_round(aes_it_tab,-32)
 177         decrypt_round(aes_it_tab,-16)
 178         decrypt_round(aes_it_tab,  0)
 179         decrypt_round(aes_it_tab, 16)
 180         decrypt_round(aes_it_tab, 32)
 181         decrypt_round(aes_it_tab, 48)
 182         decrypt_round(aes_it_tab, 64)
 183         decrypt_round(aes_it_tab, 80)
 184         decrypt_round(aes_it_tab, 96)
 185         decrypt_final(aes_il_tab,112)
 186         return