2015-02-22 08:59:49 +00:00
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/*
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* Fast AES implementation for SPE instruction set (PPC)
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*
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* This code makes use of the SPE SIMD instruction set as defined in
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* http://cache.freescale.com/files/32bit/doc/ref_manual/SPEPIM.pdf
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* Implementation is based on optimization guide notes from
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* http://cache.freescale.com/files/32bit/doc/app_note/AN2665.pdf
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*
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* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <asm/ppc_asm.h>
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#include "aes-spe-regs.h"
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#define EAD(in, bpos) \
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rlwimi rT0,in,28-((bpos+3)%4)*8,20,27;
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#define DAD(in, bpos) \
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rlwimi rT1,in,24-((bpos+3)%4)*8,24,31;
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#define LWH(out, off) \
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evlwwsplat out,off(rT0); /* load word high */
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#define LWL(out, off) \
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lwz out,off(rT0); /* load word low */
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#define LBZ(out, tab, off) \
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lbz out,off(tab); /* load byte */
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#define LAH(out, in, bpos, off) \
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EAD(in, bpos) /* calc addr + load word high */ \
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LWH(out, off)
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#define LAL(out, in, bpos, off) \
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EAD(in, bpos) /* calc addr + load word low */ \
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LWL(out, off)
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#define LAE(out, in, bpos) \
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EAD(in, bpos) /* calc addr + load enc byte */ \
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LBZ(out, rT0, 8)
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#define LBE(out) \
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LBZ(out, rT0, 8) /* load enc byte */
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#define LAD(out, in, bpos) \
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DAD(in, bpos) /* calc addr + load dec byte */ \
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LBZ(out, rT1, 0)
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#define LBD(out) \
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LBZ(out, rT1, 0)
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/*
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* ppc_encrypt_block: The central encryption function for a single 16 bytes
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* block. It does no stack handling or register saving to support fast calls
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* via bl/blr. It expects that caller has pre-xored input data with first
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* 4 words of encryption key into rD0-rD3. Pointer/counter registers must
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* have also been set up before (rT0, rKP, CTR). Output is stored in rD0-rD3
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2016-02-24 18:51:11 +00:00
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* and rW0-rW3 and caller must execute a final xor on the output registers.
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2015-02-22 08:59:49 +00:00
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* All working registers rD0-rD3 & rW0-rW7 are overwritten during processing.
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*
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*/
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_GLOBAL(ppc_encrypt_block)
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LAH(rW4, rD1, 2, 4)
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LAH(rW6, rD0, 3, 0)
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LAH(rW3, rD0, 1, 8)
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ppc_encrypt_block_loop:
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LAH(rW0, rD3, 0, 12)
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LAL(rW0, rD0, 0, 12)
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LAH(rW1, rD1, 0, 12)
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LAH(rW2, rD2, 1, 8)
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LAL(rW2, rD3, 1, 8)
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LAL(rW3, rD1, 1, 8)
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LAL(rW4, rD2, 2, 4)
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LAL(rW6, rD1, 3, 0)
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LAH(rW5, rD3, 2, 4)
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LAL(rW5, rD0, 2, 4)
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LAH(rW7, rD2, 3, 0)
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evldw rD1,16(rKP)
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EAD(rD3, 3)
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evxor rW2,rW2,rW4
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LWL(rW7, 0)
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evxor rW2,rW2,rW6
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EAD(rD2, 0)
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evxor rD1,rD1,rW2
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LWL(rW1, 12)
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evxor rD1,rD1,rW0
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evldw rD3,24(rKP)
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evmergehi rD0,rD0,rD1
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EAD(rD1, 2)
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evxor rW3,rW3,rW5
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LWH(rW4, 4)
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evxor rW3,rW3,rW7
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EAD(rD0, 3)
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evxor rD3,rD3,rW3
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LWH(rW6, 0)
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evxor rD3,rD3,rW1
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EAD(rD0, 1)
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evmergehi rD2,rD2,rD3
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LWH(rW3, 8)
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LAH(rW0, rD3, 0, 12)
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LAL(rW0, rD0, 0, 12)
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LAH(rW1, rD1, 0, 12)
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LAH(rW2, rD2, 1, 8)
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LAL(rW2, rD3, 1, 8)
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LAL(rW3, rD1, 1, 8)
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LAL(rW4, rD2, 2, 4)
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LAL(rW6, rD1, 3, 0)
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LAH(rW5, rD3, 2, 4)
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LAL(rW5, rD0, 2, 4)
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LAH(rW7, rD2, 3, 0)
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evldw rD1,32(rKP)
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EAD(rD3, 3)
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evxor rW2,rW2,rW4
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LWL(rW7, 0)
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evxor rW2,rW2,rW6
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EAD(rD2, 0)
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evxor rD1,rD1,rW2
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LWL(rW1, 12)
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evxor rD1,rD1,rW0
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evldw rD3,40(rKP)
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evmergehi rD0,rD0,rD1
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EAD(rD1, 2)
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evxor rW3,rW3,rW5
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LWH(rW4, 4)
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evxor rW3,rW3,rW7
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EAD(rD0, 3)
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evxor rD3,rD3,rW3
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LWH(rW6, 0)
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evxor rD3,rD3,rW1
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EAD(rD0, 1)
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evmergehi rD2,rD2,rD3
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LWH(rW3, 8)
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addi rKP,rKP,32
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bdnz ppc_encrypt_block_loop
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LAH(rW0, rD3, 0, 12)
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LAL(rW0, rD0, 0, 12)
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LAH(rW1, rD1, 0, 12)
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LAH(rW2, rD2, 1, 8)
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LAL(rW2, rD3, 1, 8)
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LAL(rW3, rD1, 1, 8)
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LAL(rW4, rD2, 2, 4)
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LAH(rW5, rD3, 2, 4)
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LAL(rW6, rD1, 3, 0)
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LAL(rW5, rD0, 2, 4)
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LAH(rW7, rD2, 3, 0)
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evldw rD1,16(rKP)
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EAD(rD3, 3)
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evxor rW2,rW2,rW4
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LWL(rW7, 0)
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evxor rW2,rW2,rW6
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EAD(rD2, 0)
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evxor rD1,rD1,rW2
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LWL(rW1, 12)
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evxor rD1,rD1,rW0
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evldw rD3,24(rKP)
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evmergehi rD0,rD0,rD1
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EAD(rD1, 0)
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evxor rW3,rW3,rW5
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LBE(rW2)
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evxor rW3,rW3,rW7
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EAD(rD0, 1)
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evxor rD3,rD3,rW3
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LBE(rW6)
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evxor rD3,rD3,rW1
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EAD(rD0, 0)
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evmergehi rD2,rD2,rD3
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LBE(rW1)
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LAE(rW0, rD3, 0)
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LAE(rW1, rD0, 0)
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LAE(rW4, rD2, 1)
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LAE(rW5, rD3, 1)
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LAE(rW3, rD2, 0)
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LAE(rW7, rD1, 1)
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rlwimi rW0,rW4,8,16,23
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rlwimi rW1,rW5,8,16,23
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LAE(rW4, rD1, 2)
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LAE(rW5, rD2, 2)
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rlwimi rW2,rW6,8,16,23
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rlwimi rW3,rW7,8,16,23
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LAE(rW6, rD3, 2)
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LAE(rW7, rD0, 2)
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rlwimi rW0,rW4,16,8,15
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rlwimi rW1,rW5,16,8,15
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LAE(rW4, rD0, 3)
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LAE(rW5, rD1, 3)
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rlwimi rW2,rW6,16,8,15
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lwz rD0,32(rKP)
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rlwimi rW3,rW7,16,8,15
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lwz rD1,36(rKP)
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LAE(rW6, rD2, 3)
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LAE(rW7, rD3, 3)
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rlwimi rW0,rW4,24,0,7
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lwz rD2,40(rKP)
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rlwimi rW1,rW5,24,0,7
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lwz rD3,44(rKP)
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rlwimi rW2,rW6,24,0,7
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rlwimi rW3,rW7,24,0,7
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blr
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/*
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* ppc_decrypt_block: The central decryption function for a single 16 bytes
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* block. It does no stack handling or register saving to support fast calls
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* via bl/blr. It expects that caller has pre-xored input data with first
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* 4 words of encryption key into rD0-rD3. Pointer/counter registers must
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* have also been set up before (rT0, rKP, CTR). Output is stored in rD0-rD3
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2016-02-24 18:51:11 +00:00
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* and rW0-rW3 and caller must execute a final xor on the output registers.
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2015-02-22 08:59:49 +00:00
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* All working registers rD0-rD3 & rW0-rW7 are overwritten during processing.
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*
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*/
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_GLOBAL(ppc_decrypt_block)
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LAH(rW0, rD1, 0, 12)
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LAH(rW6, rD0, 3, 0)
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LAH(rW3, rD0, 1, 8)
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ppc_decrypt_block_loop:
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LAH(rW1, rD3, 0, 12)
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LAL(rW0, rD2, 0, 12)
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LAH(rW2, rD2, 1, 8)
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LAL(rW2, rD3, 1, 8)
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LAH(rW4, rD3, 2, 4)
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LAL(rW4, rD0, 2, 4)
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LAL(rW6, rD1, 3, 0)
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LAH(rW5, rD1, 2, 4)
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LAH(rW7, rD2, 3, 0)
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LAL(rW7, rD3, 3, 0)
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LAL(rW3, rD1, 1, 8)
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evldw rD1,16(rKP)
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EAD(rD0, 0)
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evxor rW4,rW4,rW6
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LWL(rW1, 12)
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evxor rW0,rW0,rW4
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EAD(rD2, 2)
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evxor rW0,rW0,rW2
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LWL(rW5, 4)
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evxor rD1,rD1,rW0
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evldw rD3,24(rKP)
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evmergehi rD0,rD0,rD1
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EAD(rD1, 0)
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evxor rW3,rW3,rW7
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LWH(rW0, 12)
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evxor rW3,rW3,rW1
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EAD(rD0, 3)
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evxor rD3,rD3,rW3
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LWH(rW6, 0)
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evxor rD3,rD3,rW5
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EAD(rD0, 1)
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evmergehi rD2,rD2,rD3
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LWH(rW3, 8)
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LAH(rW1, rD3, 0, 12)
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LAL(rW0, rD2, 0, 12)
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LAH(rW2, rD2, 1, 8)
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LAL(rW2, rD3, 1, 8)
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LAH(rW4, rD3, 2, 4)
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LAL(rW4, rD0, 2, 4)
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LAL(rW6, rD1, 3, 0)
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LAH(rW5, rD1, 2, 4)
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LAH(rW7, rD2, 3, 0)
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LAL(rW7, rD3, 3, 0)
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LAL(rW3, rD1, 1, 8)
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evldw rD1,32(rKP)
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EAD(rD0, 0)
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evxor rW4,rW4,rW6
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LWL(rW1, 12)
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evxor rW0,rW0,rW4
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EAD(rD2, 2)
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evxor rW0,rW0,rW2
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LWL(rW5, 4)
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evxor rD1,rD1,rW0
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evldw rD3,40(rKP)
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evmergehi rD0,rD0,rD1
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EAD(rD1, 0)
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evxor rW3,rW3,rW7
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LWH(rW0, 12)
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evxor rW3,rW3,rW1
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EAD(rD0, 3)
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evxor rD3,rD3,rW3
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LWH(rW6, 0)
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evxor rD3,rD3,rW5
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EAD(rD0, 1)
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evmergehi rD2,rD2,rD3
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LWH(rW3, 8)
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addi rKP,rKP,32
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bdnz ppc_decrypt_block_loop
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LAH(rW1, rD3, 0, 12)
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LAL(rW0, rD2, 0, 12)
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LAH(rW2, rD2, 1, 8)
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LAL(rW2, rD3, 1, 8)
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LAH(rW4, rD3, 2, 4)
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LAL(rW4, rD0, 2, 4)
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LAL(rW6, rD1, 3, 0)
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LAH(rW5, rD1, 2, 4)
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LAH(rW7, rD2, 3, 0)
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LAL(rW7, rD3, 3, 0)
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LAL(rW3, rD1, 1, 8)
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evldw rD1,16(rKP)
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EAD(rD0, 0)
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evxor rW4,rW4,rW6
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LWL(rW1, 12)
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evxor rW0,rW0,rW4
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EAD(rD2, 2)
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evxor rW0,rW0,rW2
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LWL(rW5, 4)
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evxor rD1,rD1,rW0
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evldw rD3,24(rKP)
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evmergehi rD0,rD0,rD1
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DAD(rD1, 0)
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evxor rW3,rW3,rW7
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LBD(rW0)
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evxor rW3,rW3,rW1
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DAD(rD0, 1)
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evxor rD3,rD3,rW3
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LBD(rW6)
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evxor rD3,rD3,rW5
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DAD(rD0, 0)
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evmergehi rD2,rD2,rD3
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LBD(rW3)
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LAD(rW2, rD3, 0)
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LAD(rW1, rD2, 0)
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LAD(rW4, rD2, 1)
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LAD(rW5, rD3, 1)
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LAD(rW7, rD1, 1)
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rlwimi rW0,rW4,8,16,23
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rlwimi rW1,rW5,8,16,23
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LAD(rW4, rD3, 2)
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LAD(rW5, rD0, 2)
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rlwimi rW2,rW6,8,16,23
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rlwimi rW3,rW7,8,16,23
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LAD(rW6, rD1, 2)
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LAD(rW7, rD2, 2)
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rlwimi rW0,rW4,16,8,15
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rlwimi rW1,rW5,16,8,15
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LAD(rW4, rD0, 3)
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LAD(rW5, rD1, 3)
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rlwimi rW2,rW6,16,8,15
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lwz rD0,32(rKP)
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rlwimi rW3,rW7,16,8,15
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lwz rD1,36(rKP)
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LAD(rW6, rD2, 3)
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LAD(rW7, rD3, 3)
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rlwimi rW0,rW4,24,0,7
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lwz rD2,40(rKP)
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rlwimi rW1,rW5,24,0,7
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lwz rD3,44(rKP)
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rlwimi rW2,rW6,24,0,7
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rlwimi rW3,rW7,24,0,7
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blr
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