split up aes asm sbox in two parts

[avr-crypto-lib.git] / aes_dec-asm_faster.S

diff --git a/aes_dec-asm_faster.S b/aes_dec-asm_faster.S
index 08d3b979d8e71aadf9cd829d15fbbe90f8ef6c96..b4006237917df2cd72796a71aa4e8d1ca4383fd0 100644 (file)
--- a/aes_dec-asm_faster.S
+++ b/aes_dec-asm_faster.S
@@ -10,7 +10,7 @@
 
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
     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
+           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
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License


@@ -92,13 +92,11 @@ aes_decrypt_core:
        add r26, r20
        adc r27, r1
        clt
        add r26, r20
        adc r27, r1
        clt

-;      ldi CTR, 2      

        .irp param, ST00, ST01, ST02, ST03, ST10, ST11, ST12, ST13, ST20, ST21, ST22, ST23, ST30, ST31, ST32, ST33
                ld \param, Z+
        .endr
        
        ldi xREDUCER, 0x1b /* load reducer */
        .irp param, ST00, ST01, ST02, ST03, ST10, ST11, ST12, ST13, ST20, ST21, ST22, ST23, ST30, ST31, ST32, ST33
                ld \param, Z+
        .endr
        
        ldi xREDUCER, 0x1b /* load reducer */

-       ldi r31, hi8(aes_invsbox)

        
 
        .irp param, ST33, ST32, ST31, ST30, ST23, ST22, ST21, ST20, ST13, ST12, ST11, ST10, ST03, ST02, ST01, ST00
        
 
        .irp param, ST33, ST32, ST31, ST30, ST23, ST22, ST21, ST20, ST13, ST12, ST11, ST10, ST03, ST02, ST01, ST00


@@ -110,6 +108,7 @@ aes_decrypt_core:
        brne 2f
        set
 2:     
        brne 2f
        set
 2:     

+       ldi r31, hi8(aes_invsbox)

        /* substitute and invShift */
        .irp param, ST00, ST10, ST20, ST30
                mov r30, \param
        /* substitute and invShift */
        .irp param, ST00, ST10, ST20, ST30
                mov r30, \param


@@ -384,7 +383,6 @@ exit:
 3:  eor T1, T3
        eor ST30, T1
        
 3:  eor T1, T3
        eor ST30, T1
        

-       ldi r31, hi8(aes_invsbox)

        rjmp 1b
 
 .balign 256
        rjmp 1b
 
 .balign 256