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e6a3a925a2
Reduce the number of comparisons by one through the use of jb/je. This patch also corrects the comments regarding the different key lengths. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
375 lines
10 KiB
ArmAsm
375 lines
10 KiB
ArmAsm
// -------------------------------------------------------------------------
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// Copyright (c) 2001, Dr Brian Gladman < >, Worcester, UK.
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// All rights reserved.
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//
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// LICENSE TERMS
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//
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// The free distribution and use of this software in both source and binary
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// form is allowed (with or without changes) provided that:
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//
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// 1. distributions of this source code include the above copyright
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// notice, this list of conditions and the following disclaimer//
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//
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// 2. distributions in binary form include the above copyright
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// notice, this list of conditions and the following disclaimer
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// in the documentation and/or other associated materials//
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//
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// 3. the copyright holder's name is not used to endorse products
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// built using this software without specific written permission.
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//
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//
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// ALTERNATIVELY, provided that this notice is retained in full, this product
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// may be distributed under the terms of the GNU General Public License (GPL),
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// in which case the provisions of the GPL apply INSTEAD OF those given above.
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//
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// Copyright (c) 2004 Linus Torvalds <torvalds@osdl.org>
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// Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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// DISCLAIMER
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//
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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 fitness for purpose.
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// -------------------------------------------------------------------------
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// Issue Date: 29/07/2002
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.file "aes-i586-asm.S"
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.text
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// aes_rval aes_enc_blk(const unsigned char in_blk[], unsigned char out_blk[], const aes_ctx cx[1])//
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// aes_rval aes_dec_blk(const unsigned char in_blk[], unsigned char out_blk[], const aes_ctx cx[1])//
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#define tlen 1024 // length of each of 4 'xor' arrays (256 32-bit words)
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// offsets to parameters with one register pushed onto stack
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#define in_blk 8 // input byte array address parameter
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#define out_blk 12 // output byte array address parameter
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#define ctx 16 // AES context structure
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// offsets in context structure
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#define ekey 0 // encryption key schedule base address
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#define nrnd 256 // number of rounds
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#define dkey 260 // decryption key schedule base address
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// register mapping for encrypt and decrypt subroutines
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#define r0 eax
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#define r1 ebx
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#define r2 ecx
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#define r3 edx
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#define r4 esi
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#define r5 edi
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#define eaxl al
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#define eaxh ah
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#define ebxl bl
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#define ebxh bh
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#define ecxl cl
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#define ecxh ch
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#define edxl dl
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#define edxh dh
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#define _h(reg) reg##h
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#define h(reg) _h(reg)
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#define _l(reg) reg##l
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#define l(reg) _l(reg)
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// This macro takes a 32-bit word representing a column and uses
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// each of its four bytes to index into four tables of 256 32-bit
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// words to obtain values that are then xored into the appropriate
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// output registers r0, r1, r4 or r5.
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// Parameters:
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// table table base address
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// %1 out_state[0]
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// %2 out_state[1]
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// %3 out_state[2]
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// %4 out_state[3]
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// idx input register for the round (destroyed)
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// tmp scratch register for the round
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// sched key schedule
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#define do_col(table, a1,a2,a3,a4, idx, tmp) \
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movzx %l(idx),%tmp; \
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xor table(,%tmp,4),%a1; \
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movzx %h(idx),%tmp; \
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shr $16,%idx; \
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xor table+tlen(,%tmp,4),%a2; \
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movzx %l(idx),%tmp; \
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movzx %h(idx),%idx; \
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xor table+2*tlen(,%tmp,4),%a3; \
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xor table+3*tlen(,%idx,4),%a4;
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// initialise output registers from the key schedule
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// NB1: original value of a3 is in idx on exit
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// NB2: original values of a1,a2,a4 aren't used
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#define do_fcol(table, a1,a2,a3,a4, idx, tmp, sched) \
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mov 0 sched,%a1; \
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movzx %l(idx),%tmp; \
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mov 12 sched,%a2; \
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xor table(,%tmp,4),%a1; \
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mov 4 sched,%a4; \
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movzx %h(idx),%tmp; \
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shr $16,%idx; \
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xor table+tlen(,%tmp,4),%a2; \
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movzx %l(idx),%tmp; \
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movzx %h(idx),%idx; \
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xor table+3*tlen(,%idx,4),%a4; \
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mov %a3,%idx; \
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mov 8 sched,%a3; \
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xor table+2*tlen(,%tmp,4),%a3;
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// initialise output registers from the key schedule
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// NB1: original value of a3 is in idx on exit
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// NB2: original values of a1,a2,a4 aren't used
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#define do_icol(table, a1,a2,a3,a4, idx, tmp, sched) \
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mov 0 sched,%a1; \
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movzx %l(idx),%tmp; \
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mov 4 sched,%a2; \
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xor table(,%tmp,4),%a1; \
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mov 12 sched,%a4; \
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movzx %h(idx),%tmp; \
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shr $16,%idx; \
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xor table+tlen(,%tmp,4),%a2; \
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movzx %l(idx),%tmp; \
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movzx %h(idx),%idx; \
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xor table+3*tlen(,%idx,4),%a4; \
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mov %a3,%idx; \
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mov 8 sched,%a3; \
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xor table+2*tlen(,%tmp,4),%a3;
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// original Gladman had conditional saves to MMX regs.
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#define save(a1, a2) \
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mov %a2,4*a1(%esp)
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#define restore(a1, a2) \
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mov 4*a2(%esp),%a1
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// These macros perform a forward encryption cycle. They are entered with
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// the first previous round column values in r0,r1,r4,r5 and
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// exit with the final values in the same registers, using stack
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// for temporary storage.
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// round column values
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// on entry: r0,r1,r4,r5
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// on exit: r2,r1,r4,r5
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#define fwd_rnd1(arg, table) \
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save (0,r1); \
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save (1,r5); \
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\
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/* compute new column values */ \
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do_fcol(table, r2,r5,r4,r1, r0,r3, arg); /* idx=r0 */ \
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do_col (table, r4,r1,r2,r5, r0,r3); /* idx=r4 */ \
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restore(r0,0); \
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do_col (table, r1,r2,r5,r4, r0,r3); /* idx=r1 */ \
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restore(r0,1); \
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do_col (table, r5,r4,r1,r2, r0,r3); /* idx=r5 */
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// round column values
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// on entry: r2,r1,r4,r5
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// on exit: r0,r1,r4,r5
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#define fwd_rnd2(arg, table) \
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save (0,r1); \
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save (1,r5); \
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\
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/* compute new column values */ \
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do_fcol(table, r0,r5,r4,r1, r2,r3, arg); /* idx=r2 */ \
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do_col (table, r4,r1,r0,r5, r2,r3); /* idx=r4 */ \
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restore(r2,0); \
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do_col (table, r1,r0,r5,r4, r2,r3); /* idx=r1 */ \
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restore(r2,1); \
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do_col (table, r5,r4,r1,r0, r2,r3); /* idx=r5 */
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// These macros performs an inverse encryption cycle. They are entered with
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// the first previous round column values in r0,r1,r4,r5 and
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// exit with the final values in the same registers, using stack
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// for temporary storage
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// round column values
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// on entry: r0,r1,r4,r5
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// on exit: r2,r1,r4,r5
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#define inv_rnd1(arg, table) \
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save (0,r1); \
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save (1,r5); \
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\
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/* compute new column values */ \
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do_icol(table, r2,r1,r4,r5, r0,r3, arg); /* idx=r0 */ \
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do_col (table, r4,r5,r2,r1, r0,r3); /* idx=r4 */ \
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restore(r0,0); \
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do_col (table, r1,r4,r5,r2, r0,r3); /* idx=r1 */ \
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restore(r0,1); \
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do_col (table, r5,r2,r1,r4, r0,r3); /* idx=r5 */
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// round column values
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// on entry: r2,r1,r4,r5
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// on exit: r0,r1,r4,r5
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#define inv_rnd2(arg, table) \
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save (0,r1); \
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save (1,r5); \
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\
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/* compute new column values */ \
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do_icol(table, r0,r1,r4,r5, r2,r3, arg); /* idx=r2 */ \
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do_col (table, r4,r5,r0,r1, r2,r3); /* idx=r4 */ \
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restore(r2,0); \
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do_col (table, r1,r4,r5,r0, r2,r3); /* idx=r1 */ \
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restore(r2,1); \
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do_col (table, r5,r0,r1,r4, r2,r3); /* idx=r5 */
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// AES (Rijndael) Encryption Subroutine
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.global aes_enc_blk
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.extern ft_tab
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.extern fl_tab
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.align 4
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aes_enc_blk:
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push %ebp
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mov ctx(%esp),%ebp // pointer to context
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// CAUTION: the order and the values used in these assigns
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// rely on the register mappings
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1: push %ebx
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mov in_blk+4(%esp),%r2
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push %esi
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mov nrnd(%ebp),%r3 // number of rounds
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push %edi
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#if ekey != 0
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lea ekey(%ebp),%ebp // key pointer
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#endif
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// input four columns and xor in first round key
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mov (%r2),%r0
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mov 4(%r2),%r1
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mov 8(%r2),%r4
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mov 12(%r2),%r5
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xor (%ebp),%r0
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xor 4(%ebp),%r1
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xor 8(%ebp),%r4
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xor 12(%ebp),%r5
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sub $8,%esp // space for register saves on stack
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add $16,%ebp // increment to next round key
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cmp $12,%r3
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jb 4f // 10 rounds for 128-bit key
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lea 32(%ebp),%ebp
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je 3f // 12 rounds for 192-bit key
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lea 32(%ebp),%ebp
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2: fwd_rnd1( -64(%ebp) ,ft_tab) // 14 rounds for 256-bit key
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fwd_rnd2( -48(%ebp) ,ft_tab)
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3: fwd_rnd1( -32(%ebp) ,ft_tab) // 12 rounds for 192-bit key
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fwd_rnd2( -16(%ebp) ,ft_tab)
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4: fwd_rnd1( (%ebp) ,ft_tab) // 10 rounds for 128-bit key
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fwd_rnd2( +16(%ebp) ,ft_tab)
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fwd_rnd1( +32(%ebp) ,ft_tab)
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fwd_rnd2( +48(%ebp) ,ft_tab)
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fwd_rnd1( +64(%ebp) ,ft_tab)
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fwd_rnd2( +80(%ebp) ,ft_tab)
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fwd_rnd1( +96(%ebp) ,ft_tab)
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fwd_rnd2(+112(%ebp) ,ft_tab)
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fwd_rnd1(+128(%ebp) ,ft_tab)
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fwd_rnd2(+144(%ebp) ,fl_tab) // last round uses a different table
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// move final values to the output array. CAUTION: the
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// order of these assigns rely on the register mappings
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add $8,%esp
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mov out_blk+12(%esp),%ebp
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mov %r5,12(%ebp)
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pop %edi
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mov %r4,8(%ebp)
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pop %esi
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mov %r1,4(%ebp)
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pop %ebx
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mov %r0,(%ebp)
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pop %ebp
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mov $1,%eax
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ret
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// AES (Rijndael) Decryption Subroutine
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.global aes_dec_blk
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.extern it_tab
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.extern il_tab
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.align 4
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aes_dec_blk:
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push %ebp
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mov ctx(%esp),%ebp // pointer to context
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// CAUTION: the order and the values used in these assigns
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// rely on the register mappings
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1: push %ebx
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mov in_blk+4(%esp),%r2
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push %esi
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mov nrnd(%ebp),%r3 // number of rounds
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push %edi
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#if dkey != 0
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lea dkey(%ebp),%ebp // key pointer
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#endif
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mov %r3,%r0
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shl $4,%r0
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add %r0,%ebp
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// input four columns and xor in first round key
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mov (%r2),%r0
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mov 4(%r2),%r1
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mov 8(%r2),%r4
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mov 12(%r2),%r5
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xor (%ebp),%r0
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xor 4(%ebp),%r1
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xor 8(%ebp),%r4
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xor 12(%ebp),%r5
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sub $8,%esp // space for register saves on stack
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sub $16,%ebp // increment to next round key
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cmp $12,%r3
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jb 4f // 10 rounds for 128-bit key
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lea -32(%ebp),%ebp
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je 3f // 12 rounds for 192-bit key
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lea -32(%ebp),%ebp
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2: inv_rnd1( +64(%ebp), it_tab) // 14 rounds for 256-bit key
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inv_rnd2( +48(%ebp), it_tab)
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3: inv_rnd1( +32(%ebp), it_tab) // 12 rounds for 192-bit key
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inv_rnd2( +16(%ebp), it_tab)
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4: inv_rnd1( (%ebp), it_tab) // 10 rounds for 128-bit key
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inv_rnd2( -16(%ebp), it_tab)
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inv_rnd1( -32(%ebp), it_tab)
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inv_rnd2( -48(%ebp), it_tab)
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inv_rnd1( -64(%ebp), it_tab)
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inv_rnd2( -80(%ebp), it_tab)
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inv_rnd1( -96(%ebp), it_tab)
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inv_rnd2(-112(%ebp), it_tab)
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inv_rnd1(-128(%ebp), it_tab)
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inv_rnd2(-144(%ebp), il_tab) // last round uses a different table
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// move final values to the output array. CAUTION: the
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// order of these assigns rely on the register mappings
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add $8,%esp
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mov out_blk+12(%esp),%ebp
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mov %r5,12(%ebp)
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pop %edi
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mov %r4,8(%ebp)
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pop %esi
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mov %r1,4(%ebp)
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pop %ebx
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mov %r0,(%ebp)
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pop %ebp
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mov $1,%eax
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ret
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