| /*************************************************************************** |
| * Copyright (C) 2006 by Joachim Fritschi, <jfritschi@freenet.de> * |
| * * |
| * This program is free software; you can redistribute it and/or modify * |
| * it under the terms of the GNU General Public License as published by * |
| * the Free Software Foundation; either version 2 of the License, or * |
| * (at your option) any later version. * |
| * * |
| * This program is distributed in the hope that it will be useful, * |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| * GNU General Public License for more details. * |
| * * |
| * You should have received a copy of the GNU General Public License * |
| * along with this program; if not, write to the * |
| * Free Software Foundation, Inc., * |
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
| ***************************************************************************/ |
| |
| .file "twofish-i586-asm.S" |
| .text |
| |
| #include <linux/linkage.h> |
| #include <asm/asm-offsets.h> |
| |
| /* return address at 0 */ |
| |
| #define in_blk 12 /* input byte array address parameter*/ |
| #define out_blk 8 /* output byte array address parameter*/ |
| #define ctx 4 /* Twofish context structure */ |
| |
| #define a_offset 0 |
| #define b_offset 4 |
| #define c_offset 8 |
| #define d_offset 12 |
| |
| /* Structure of the crypto context struct*/ |
| |
| #define s0 0 /* S0 Array 256 Words each */ |
| #define s1 1024 /* S1 Array */ |
| #define s2 2048 /* S2 Array */ |
| #define s3 3072 /* S3 Array */ |
| #define w 4096 /* 8 whitening keys (word) */ |
| #define k 4128 /* key 1-32 ( word ) */ |
| |
| /* define a few register aliases to allow macro substitution */ |
| |
| #define R0D %eax |
| #define R0B %al |
| #define R0H %ah |
| |
| #define R1D %ebx |
| #define R1B %bl |
| #define R1H %bh |
| |
| #define R2D %ecx |
| #define R2B %cl |
| #define R2H %ch |
| |
| #define R3D %edx |
| #define R3B %dl |
| #define R3H %dh |
| |
| |
| /* performs input whitening */ |
| #define input_whitening(src,context,offset)\ |
| xor w+offset(context), src; |
| |
| /* performs input whitening */ |
| #define output_whitening(src,context,offset)\ |
| xor w+16+offset(context), src; |
| |
| /* |
| * a input register containing a (rotated 16) |
| * b input register containing b |
| * c input register containing c |
| * d input register containing d (already rol $1) |
| * operations on a and b are interleaved to increase performance |
| */ |
| #define encrypt_round(a,b,c,d,round)\ |
| push d ## D;\ |
| movzx b ## B, %edi;\ |
| mov s1(%ebp,%edi,4),d ## D;\ |
| movzx a ## B, %edi;\ |
| mov s2(%ebp,%edi,4),%esi;\ |
| movzx b ## H, %edi;\ |
| ror $16, b ## D;\ |
| xor s2(%ebp,%edi,4),d ## D;\ |
| movzx a ## H, %edi;\ |
| ror $16, a ## D;\ |
| xor s3(%ebp,%edi,4),%esi;\ |
| movzx b ## B, %edi;\ |
| xor s3(%ebp,%edi,4),d ## D;\ |
| movzx a ## B, %edi;\ |
| xor (%ebp,%edi,4), %esi;\ |
| movzx b ## H, %edi;\ |
| ror $15, b ## D;\ |
| xor (%ebp,%edi,4), d ## D;\ |
| movzx a ## H, %edi;\ |
| xor s1(%ebp,%edi,4),%esi;\ |
| pop %edi;\ |
| add d ## D, %esi;\ |
| add %esi, d ## D;\ |
| add k+round(%ebp), %esi;\ |
| xor %esi, c ## D;\ |
| rol $15, c ## D;\ |
| add k+4+round(%ebp),d ## D;\ |
| xor %edi, d ## D; |
| |
| /* |
| * a input register containing a (rotated 16) |
| * b input register containing b |
| * c input register containing c |
| * d input register containing d (already rol $1) |
| * operations on a and b are interleaved to increase performance |
| * last round has different rotations for the output preparation |
| */ |
| #define encrypt_last_round(a,b,c,d,round)\ |
| push d ## D;\ |
| movzx b ## B, %edi;\ |
| mov s1(%ebp,%edi,4),d ## D;\ |
| movzx a ## B, %edi;\ |
| mov s2(%ebp,%edi,4),%esi;\ |
| movzx b ## H, %edi;\ |
| ror $16, b ## D;\ |
| xor s2(%ebp,%edi,4),d ## D;\ |
| movzx a ## H, %edi;\ |
| ror $16, a ## D;\ |
| xor s3(%ebp,%edi,4),%esi;\ |
| movzx b ## B, %edi;\ |
| xor s3(%ebp,%edi,4),d ## D;\ |
| movzx a ## B, %edi;\ |
| xor (%ebp,%edi,4), %esi;\ |
| movzx b ## H, %edi;\ |
| ror $16, b ## D;\ |
| xor (%ebp,%edi,4), d ## D;\ |
| movzx a ## H, %edi;\ |
| xor s1(%ebp,%edi,4),%esi;\ |
| pop %edi;\ |
| add d ## D, %esi;\ |
| add %esi, d ## D;\ |
| add k+round(%ebp), %esi;\ |
| xor %esi, c ## D;\ |
| ror $1, c ## D;\ |
| add k+4+round(%ebp),d ## D;\ |
| xor %edi, d ## D; |
| |
| /* |
| * a input register containing a |
| * b input register containing b (rotated 16) |
| * c input register containing c |
| * d input register containing d (already rol $1) |
| * operations on a and b are interleaved to increase performance |
| */ |
| #define decrypt_round(a,b,c,d,round)\ |
| push c ## D;\ |
| movzx a ## B, %edi;\ |
| mov (%ebp,%edi,4), c ## D;\ |
| movzx b ## B, %edi;\ |
| mov s3(%ebp,%edi,4),%esi;\ |
| movzx a ## H, %edi;\ |
| ror $16, a ## D;\ |
| xor s1(%ebp,%edi,4),c ## D;\ |
| movzx b ## H, %edi;\ |
| ror $16, b ## D;\ |
| xor (%ebp,%edi,4), %esi;\ |
| movzx a ## B, %edi;\ |
| xor s2(%ebp,%edi,4),c ## D;\ |
| movzx b ## B, %edi;\ |
| xor s1(%ebp,%edi,4),%esi;\ |
| movzx a ## H, %edi;\ |
| ror $15, a ## D;\ |
| xor s3(%ebp,%edi,4),c ## D;\ |
| movzx b ## H, %edi;\ |
| xor s2(%ebp,%edi,4),%esi;\ |
| pop %edi;\ |
| add %esi, c ## D;\ |
| add c ## D, %esi;\ |
| add k+round(%ebp), c ## D;\ |
| xor %edi, c ## D;\ |
| add k+4+round(%ebp),%esi;\ |
| xor %esi, d ## D;\ |
| rol $15, d ## D; |
| |
| /* |
| * a input register containing a |
| * b input register containing b (rotated 16) |
| * c input register containing c |
| * d input register containing d (already rol $1) |
| * operations on a and b are interleaved to increase performance |
| * last round has different rotations for the output preparation |
| */ |
| #define decrypt_last_round(a,b,c,d,round)\ |
| push c ## D;\ |
| movzx a ## B, %edi;\ |
| mov (%ebp,%edi,4), c ## D;\ |
| movzx b ## B, %edi;\ |
| mov s3(%ebp,%edi,4),%esi;\ |
| movzx a ## H, %edi;\ |
| ror $16, a ## D;\ |
| xor s1(%ebp,%edi,4),c ## D;\ |
| movzx b ## H, %edi;\ |
| ror $16, b ## D;\ |
| xor (%ebp,%edi,4), %esi;\ |
| movzx a ## B, %edi;\ |
| xor s2(%ebp,%edi,4),c ## D;\ |
| movzx b ## B, %edi;\ |
| xor s1(%ebp,%edi,4),%esi;\ |
| movzx a ## H, %edi;\ |
| ror $16, a ## D;\ |
| xor s3(%ebp,%edi,4),c ## D;\ |
| movzx b ## H, %edi;\ |
| xor s2(%ebp,%edi,4),%esi;\ |
| pop %edi;\ |
| add %esi, c ## D;\ |
| add c ## D, %esi;\ |
| add k+round(%ebp), c ## D;\ |
| xor %edi, c ## D;\ |
| add k+4+round(%ebp),%esi;\ |
| xor %esi, d ## D;\ |
| ror $1, d ## D; |
| |
| ENTRY(twofish_enc_blk) |
| push %ebp /* save registers according to calling convention*/ |
| push %ebx |
| push %esi |
| push %edi |
| |
| mov ctx + 16(%esp), %ebp /* abuse the base pointer: set new base |
| * pointer to the ctx address */ |
| mov in_blk+16(%esp),%edi /* input address in edi */ |
| |
| mov (%edi), %eax |
| mov b_offset(%edi), %ebx |
| mov c_offset(%edi), %ecx |
| mov d_offset(%edi), %edx |
| input_whitening(%eax,%ebp,a_offset) |
| ror $16, %eax |
| input_whitening(%ebx,%ebp,b_offset) |
| input_whitening(%ecx,%ebp,c_offset) |
| input_whitening(%edx,%ebp,d_offset) |
| rol $1, %edx |
| |
| encrypt_round(R0,R1,R2,R3,0); |
| encrypt_round(R2,R3,R0,R1,8); |
| encrypt_round(R0,R1,R2,R3,2*8); |
| encrypt_round(R2,R3,R0,R1,3*8); |
| encrypt_round(R0,R1,R2,R3,4*8); |
| encrypt_round(R2,R3,R0,R1,5*8); |
| encrypt_round(R0,R1,R2,R3,6*8); |
| encrypt_round(R2,R3,R0,R1,7*8); |
| encrypt_round(R0,R1,R2,R3,8*8); |
| encrypt_round(R2,R3,R0,R1,9*8); |
| encrypt_round(R0,R1,R2,R3,10*8); |
| encrypt_round(R2,R3,R0,R1,11*8); |
| encrypt_round(R0,R1,R2,R3,12*8); |
| encrypt_round(R2,R3,R0,R1,13*8); |
| encrypt_round(R0,R1,R2,R3,14*8); |
| encrypt_last_round(R2,R3,R0,R1,15*8); |
| |
| output_whitening(%eax,%ebp,c_offset) |
| output_whitening(%ebx,%ebp,d_offset) |
| output_whitening(%ecx,%ebp,a_offset) |
| output_whitening(%edx,%ebp,b_offset) |
| mov out_blk+16(%esp),%edi; |
| mov %eax, c_offset(%edi) |
| mov %ebx, d_offset(%edi) |
| mov %ecx, (%edi) |
| mov %edx, b_offset(%edi) |
| |
| pop %edi |
| pop %esi |
| pop %ebx |
| pop %ebp |
| mov $1, %eax |
| ret |
| ENDPROC(twofish_enc_blk) |
| |
| ENTRY(twofish_dec_blk) |
| push %ebp /* save registers according to calling convention*/ |
| push %ebx |
| push %esi |
| push %edi |
| |
| |
| mov ctx + 16(%esp), %ebp /* abuse the base pointer: set new base |
| * pointer to the ctx address */ |
| mov in_blk+16(%esp),%edi /* input address in edi */ |
| |
| mov (%edi), %eax |
| mov b_offset(%edi), %ebx |
| mov c_offset(%edi), %ecx |
| mov d_offset(%edi), %edx |
| output_whitening(%eax,%ebp,a_offset) |
| output_whitening(%ebx,%ebp,b_offset) |
| ror $16, %ebx |
| output_whitening(%ecx,%ebp,c_offset) |
| output_whitening(%edx,%ebp,d_offset) |
| rol $1, %ecx |
| |
| decrypt_round(R0,R1,R2,R3,15*8); |
| decrypt_round(R2,R3,R0,R1,14*8); |
| decrypt_round(R0,R1,R2,R3,13*8); |
| decrypt_round(R2,R3,R0,R1,12*8); |
| decrypt_round(R0,R1,R2,R3,11*8); |
| decrypt_round(R2,R3,R0,R1,10*8); |
| decrypt_round(R0,R1,R2,R3,9*8); |
| decrypt_round(R2,R3,R0,R1,8*8); |
| decrypt_round(R0,R1,R2,R3,7*8); |
| decrypt_round(R2,R3,R0,R1,6*8); |
| decrypt_round(R0,R1,R2,R3,5*8); |
| decrypt_round(R2,R3,R0,R1,4*8); |
| decrypt_round(R0,R1,R2,R3,3*8); |
| decrypt_round(R2,R3,R0,R1,2*8); |
| decrypt_round(R0,R1,R2,R3,1*8); |
| decrypt_last_round(R2,R3,R0,R1,0); |
| |
| input_whitening(%eax,%ebp,c_offset) |
| input_whitening(%ebx,%ebp,d_offset) |
| input_whitening(%ecx,%ebp,a_offset) |
| input_whitening(%edx,%ebp,b_offset) |
| mov out_blk+16(%esp),%edi; |
| mov %eax, c_offset(%edi) |
| mov %ebx, d_offset(%edi) |
| mov %ecx, (%edi) |
| mov %edx, b_offset(%edi) |
| |
| pop %edi |
| pop %esi |
| pop %ebx |
| pop %ebp |
| mov $1, %eax |
| ret |
| ENDPROC(twofish_dec_blk) |
