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| /* SPDX-License-Identifier: GPL-2.0-or-later */
| /*
| * Fast AES implementation for SPE instruction set (PPC)
| *
| * This code makes use of the SPE SIMD instruction set as defined in
| * http://cache.freescale.com/files/32bit/doc/ref_manual/SPEPIM.pdf
| * Implementation is based on optimization guide notes from
| * http://cache.freescale.com/files/32bit/doc/app_note/AN2665.pdf
| *
| * Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
| */
|
| #include <asm/ppc_asm.h>
| #include "aes-spe-regs.h"
|
| #define EAD(in, bpos) \
| rlwimi rT0,in,28-((bpos+3)%4)*8,20,27;
|
| #define DAD(in, bpos) \
| rlwimi rT1,in,24-((bpos+3)%4)*8,24,31;
|
| #define LWH(out, off) \
| evlwwsplat out,off(rT0); /* load word high */
|
| #define LWL(out, off) \
| lwz out,off(rT0); /* load word low */
|
| #define LBZ(out, tab, off) \
| lbz out,off(tab); /* load byte */
|
| #define LAH(out, in, bpos, off) \
| EAD(in, bpos) /* calc addr + load word high */ \
| LWH(out, off)
|
| #define LAL(out, in, bpos, off) \
| EAD(in, bpos) /* calc addr + load word low */ \
| LWL(out, off)
|
| #define LAE(out, in, bpos) \
| EAD(in, bpos) /* calc addr + load enc byte */ \
| LBZ(out, rT0, 8)
|
| #define LBE(out) \
| LBZ(out, rT0, 8) /* load enc byte */
|
| #define LAD(out, in, bpos) \
| DAD(in, bpos) /* calc addr + load dec byte */ \
| LBZ(out, rT1, 0)
|
| #define LBD(out) \
| LBZ(out, rT1, 0)
|
| /*
| * ppc_encrypt_block: The central encryption function for a single 16 bytes
| * block. It does no stack handling or register saving to support fast calls
| * via bl/blr. It expects that caller has pre-xored input data with first
| * 4 words of encryption key into rD0-rD3. Pointer/counter registers must
| * have also been set up before (rT0, rKP, CTR). Output is stored in rD0-rD3
| * and rW0-rW3 and caller must execute a final xor on the output registers.
| * All working registers rD0-rD3 & rW0-rW7 are overwritten during processing.
| *
| */
| _GLOBAL(ppc_encrypt_block)
| LAH(rW4, rD1, 2, 4)
| LAH(rW6, rD0, 3, 0)
| LAH(rW3, rD0, 1, 8)
| ppc_encrypt_block_loop:
| LAH(rW0, rD3, 0, 12)
| LAL(rW0, rD0, 0, 12)
| LAH(rW1, rD1, 0, 12)
| LAH(rW2, rD2, 1, 8)
| LAL(rW2, rD3, 1, 8)
| LAL(rW3, rD1, 1, 8)
| LAL(rW4, rD2, 2, 4)
| LAL(rW6, rD1, 3, 0)
| LAH(rW5, rD3, 2, 4)
| LAL(rW5, rD0, 2, 4)
| LAH(rW7, rD2, 3, 0)
| evldw rD1,16(rKP)
| EAD(rD3, 3)
| evxor rW2,rW2,rW4
| LWL(rW7, 0)
| evxor rW2,rW2,rW6
| EAD(rD2, 0)
| evxor rD1,rD1,rW2
| LWL(rW1, 12)
| evxor rD1,rD1,rW0
| evldw rD3,24(rKP)
| evmergehi rD0,rD0,rD1
| EAD(rD1, 2)
| evxor rW3,rW3,rW5
| LWH(rW4, 4)
| evxor rW3,rW3,rW7
| EAD(rD0, 3)
| evxor rD3,rD3,rW3
| LWH(rW6, 0)
| evxor rD3,rD3,rW1
| EAD(rD0, 1)
| evmergehi rD2,rD2,rD3
| LWH(rW3, 8)
| LAH(rW0, rD3, 0, 12)
| LAL(rW0, rD0, 0, 12)
| LAH(rW1, rD1, 0, 12)
| LAH(rW2, rD2, 1, 8)
| LAL(rW2, rD3, 1, 8)
| LAL(rW3, rD1, 1, 8)
| LAL(rW4, rD2, 2, 4)
| LAL(rW6, rD1, 3, 0)
| LAH(rW5, rD3, 2, 4)
| LAL(rW5, rD0, 2, 4)
| LAH(rW7, rD2, 3, 0)
| evldw rD1,32(rKP)
| EAD(rD3, 3)
| evxor rW2,rW2,rW4
| LWL(rW7, 0)
| evxor rW2,rW2,rW6
| EAD(rD2, 0)
| evxor rD1,rD1,rW2
| LWL(rW1, 12)
| evxor rD1,rD1,rW0
| evldw rD3,40(rKP)
| evmergehi rD0,rD0,rD1
| EAD(rD1, 2)
| evxor rW3,rW3,rW5
| LWH(rW4, 4)
| evxor rW3,rW3,rW7
| EAD(rD0, 3)
| evxor rD3,rD3,rW3
| LWH(rW6, 0)
| evxor rD3,rD3,rW1
| EAD(rD0, 1)
| evmergehi rD2,rD2,rD3
| LWH(rW3, 8)
| addi rKP,rKP,32
| bdnz ppc_encrypt_block_loop
| LAH(rW0, rD3, 0, 12)
| LAL(rW0, rD0, 0, 12)
| LAH(rW1, rD1, 0, 12)
| LAH(rW2, rD2, 1, 8)
| LAL(rW2, rD3, 1, 8)
| LAL(rW3, rD1, 1, 8)
| LAL(rW4, rD2, 2, 4)
| LAH(rW5, rD3, 2, 4)
| LAL(rW6, rD1, 3, 0)
| LAL(rW5, rD0, 2, 4)
| LAH(rW7, rD2, 3, 0)
| evldw rD1,16(rKP)
| EAD(rD3, 3)
| evxor rW2,rW2,rW4
| LWL(rW7, 0)
| evxor rW2,rW2,rW6
| EAD(rD2, 0)
| evxor rD1,rD1,rW2
| LWL(rW1, 12)
| evxor rD1,rD1,rW0
| evldw rD3,24(rKP)
| evmergehi rD0,rD0,rD1
| EAD(rD1, 0)
| evxor rW3,rW3,rW5
| LBE(rW2)
| evxor rW3,rW3,rW7
| EAD(rD0, 1)
| evxor rD3,rD3,rW3
| LBE(rW6)
| evxor rD3,rD3,rW1
| EAD(rD0, 0)
| evmergehi rD2,rD2,rD3
| LBE(rW1)
| LAE(rW0, rD3, 0)
| LAE(rW1, rD0, 0)
| LAE(rW4, rD2, 1)
| LAE(rW5, rD3, 1)
| LAE(rW3, rD2, 0)
| LAE(rW7, rD1, 1)
| rlwimi rW0,rW4,8,16,23
| rlwimi rW1,rW5,8,16,23
| LAE(rW4, rD1, 2)
| LAE(rW5, rD2, 2)
| rlwimi rW2,rW6,8,16,23
| rlwimi rW3,rW7,8,16,23
| LAE(rW6, rD3, 2)
| LAE(rW7, rD0, 2)
| rlwimi rW0,rW4,16,8,15
| rlwimi rW1,rW5,16,8,15
| LAE(rW4, rD0, 3)
| LAE(rW5, rD1, 3)
| rlwimi rW2,rW6,16,8,15
| lwz rD0,32(rKP)
| rlwimi rW3,rW7,16,8,15
| lwz rD1,36(rKP)
| LAE(rW6, rD2, 3)
| LAE(rW7, rD3, 3)
| rlwimi rW0,rW4,24,0,7
| lwz rD2,40(rKP)
| rlwimi rW1,rW5,24,0,7
| lwz rD3,44(rKP)
| rlwimi rW2,rW6,24,0,7
| rlwimi rW3,rW7,24,0,7
| blr
|
| /*
| * ppc_decrypt_block: The central decryption function for a single 16 bytes
| * block. It does no stack handling or register saving to support fast calls
| * via bl/blr. It expects that caller has pre-xored input data with first
| * 4 words of encryption key into rD0-rD3. Pointer/counter registers must
| * have also been set up before (rT0, rKP, CTR). Output is stored in rD0-rD3
| * and rW0-rW3 and caller must execute a final xor on the output registers.
| * All working registers rD0-rD3 & rW0-rW7 are overwritten during processing.
| *
| */
| _GLOBAL(ppc_decrypt_block)
| LAH(rW0, rD1, 0, 12)
| LAH(rW6, rD0, 3, 0)
| LAH(rW3, rD0, 1, 8)
| ppc_decrypt_block_loop:
| LAH(rW1, rD3, 0, 12)
| LAL(rW0, rD2, 0, 12)
| LAH(rW2, rD2, 1, 8)
| LAL(rW2, rD3, 1, 8)
| LAH(rW4, rD3, 2, 4)
| LAL(rW4, rD0, 2, 4)
| LAL(rW6, rD1, 3, 0)
| LAH(rW5, rD1, 2, 4)
| LAH(rW7, rD2, 3, 0)
| LAL(rW7, rD3, 3, 0)
| LAL(rW3, rD1, 1, 8)
| evldw rD1,16(rKP)
| EAD(rD0, 0)
| evxor rW4,rW4,rW6
| LWL(rW1, 12)
| evxor rW0,rW0,rW4
| EAD(rD2, 2)
| evxor rW0,rW0,rW2
| LWL(rW5, 4)
| evxor rD1,rD1,rW0
| evldw rD3,24(rKP)
| evmergehi rD0,rD0,rD1
| EAD(rD1, 0)
| evxor rW3,rW3,rW7
| LWH(rW0, 12)
| evxor rW3,rW3,rW1
| EAD(rD0, 3)
| evxor rD3,rD3,rW3
| LWH(rW6, 0)
| evxor rD3,rD3,rW5
| EAD(rD0, 1)
| evmergehi rD2,rD2,rD3
| LWH(rW3, 8)
| LAH(rW1, rD3, 0, 12)
| LAL(rW0, rD2, 0, 12)
| LAH(rW2, rD2, 1, 8)
| LAL(rW2, rD3, 1, 8)
| LAH(rW4, rD3, 2, 4)
| LAL(rW4, rD0, 2, 4)
| LAL(rW6, rD1, 3, 0)
| LAH(rW5, rD1, 2, 4)
| LAH(rW7, rD2, 3, 0)
| LAL(rW7, rD3, 3, 0)
| LAL(rW3, rD1, 1, 8)
| evldw rD1,32(rKP)
| EAD(rD0, 0)
| evxor rW4,rW4,rW6
| LWL(rW1, 12)
| evxor rW0,rW0,rW4
| EAD(rD2, 2)
| evxor rW0,rW0,rW2
| LWL(rW5, 4)
| evxor rD1,rD1,rW0
| evldw rD3,40(rKP)
| evmergehi rD0,rD0,rD1
| EAD(rD1, 0)
| evxor rW3,rW3,rW7
| LWH(rW0, 12)
| evxor rW3,rW3,rW1
| EAD(rD0, 3)
| evxor rD3,rD3,rW3
| LWH(rW6, 0)
| evxor rD3,rD3,rW5
| EAD(rD0, 1)
| evmergehi rD2,rD2,rD3
| LWH(rW3, 8)
| addi rKP,rKP,32
| bdnz ppc_decrypt_block_loop
| LAH(rW1, rD3, 0, 12)
| LAL(rW0, rD2, 0, 12)
| LAH(rW2, rD2, 1, 8)
| LAL(rW2, rD3, 1, 8)
| LAH(rW4, rD3, 2, 4)
| LAL(rW4, rD0, 2, 4)
| LAL(rW6, rD1, 3, 0)
| LAH(rW5, rD1, 2, 4)
| LAH(rW7, rD2, 3, 0)
| LAL(rW7, rD3, 3, 0)
| LAL(rW3, rD1, 1, 8)
| evldw rD1,16(rKP)
| EAD(rD0, 0)
| evxor rW4,rW4,rW6
| LWL(rW1, 12)
| evxor rW0,rW0,rW4
| EAD(rD2, 2)
| evxor rW0,rW0,rW2
| LWL(rW5, 4)
| evxor rD1,rD1,rW0
| evldw rD3,24(rKP)
| evmergehi rD0,rD0,rD1
| DAD(rD1, 0)
| evxor rW3,rW3,rW7
| LBD(rW0)
| evxor rW3,rW3,rW1
| DAD(rD0, 1)
| evxor rD3,rD3,rW3
| LBD(rW6)
| evxor rD3,rD3,rW5
| DAD(rD0, 0)
| evmergehi rD2,rD2,rD3
| LBD(rW3)
| LAD(rW2, rD3, 0)
| LAD(rW1, rD2, 0)
| LAD(rW4, rD2, 1)
| LAD(rW5, rD3, 1)
| LAD(rW7, rD1, 1)
| rlwimi rW0,rW4,8,16,23
| rlwimi rW1,rW5,8,16,23
| LAD(rW4, rD3, 2)
| LAD(rW5, rD0, 2)
| rlwimi rW2,rW6,8,16,23
| rlwimi rW3,rW7,8,16,23
| LAD(rW6, rD1, 2)
| LAD(rW7, rD2, 2)
| rlwimi rW0,rW4,16,8,15
| rlwimi rW1,rW5,16,8,15
| LAD(rW4, rD0, 3)
| LAD(rW5, rD1, 3)
| rlwimi rW2,rW6,16,8,15
| lwz rD0,32(rKP)
| rlwimi rW3,rW7,16,8,15
| lwz rD1,36(rKP)
| LAD(rW6, rD2, 3)
| LAD(rW7, rD3, 3)
| rlwimi rW0,rW4,24,0,7
| lwz rD2,40(rKP)
| rlwimi rW1,rW5,24,0,7
| lwz rD3,44(rKP)
| rlwimi rW2,rW6,24,0,7
| rlwimi rW3,rW7,24,0,7
| blr
|
|
