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powerpc: Add a powerpc implementation of SHA-1
This patch adds a crypto driver which provides a powerpc accelerated implementation of SHA-1, accelerated in that it is written in asm. Original patch by Paul, minor fixups for upstream by moi. Lightly tested on 64-bit with the test program here: http://michael.ellerman.id.au/files/junkcode/sha1test.c Seems to work, and is "not slower" than the generic version. Needs testing on 32-bit. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman
Benjamin Herrenschmidt
parent
5c49985c21
commit
323a6bf1d6
@ -143,6 +143,7 @@ core-y += arch/powerpc/kernel/ \
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arch/powerpc/sysdev/ \
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arch/powerpc/platforms/ \
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arch/powerpc/math-emu/ \
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arch/powerpc/crypto/ \
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arch/powerpc/net/
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core-$(CONFIG_XMON) += arch/powerpc/xmon/
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core-$(CONFIG_KVM) += arch/powerpc/kvm/
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9
arch/powerpc/crypto/Makefile
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9
arch/powerpc/crypto/Makefile
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@ -0,0 +1,9 @@
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#
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# powerpc/crypto/Makefile
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#
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# Arch-specific CryptoAPI modules.
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#
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obj-$(CONFIG_CRYPTO_SHA1_PPC) += sha1-powerpc.o
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sha1-powerpc-y := sha1-powerpc-asm.o sha1.o
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179
arch/powerpc/crypto/sha1-powerpc-asm.S
Normal file
179
arch/powerpc/crypto/sha1-powerpc-asm.S
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@ -0,0 +1,179 @@
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/*
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* SHA-1 implementation for PowerPC.
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*
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* Copyright (C) 2005 Paul Mackerras <paulus@samba.org>
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*/
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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/*
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* We roll the registers for T, A, B, C, D, E around on each
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* iteration; T on iteration t is A on iteration t+1, and so on.
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* We use registers 7 - 12 for this.
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*/
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#define RT(t) ((((t)+5)%6)+7)
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#define RA(t) ((((t)+4)%6)+7)
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#define RB(t) ((((t)+3)%6)+7)
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#define RC(t) ((((t)+2)%6)+7)
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#define RD(t) ((((t)+1)%6)+7)
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#define RE(t) ((((t)+0)%6)+7)
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/* We use registers 16 - 31 for the W values */
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#define W(t) (((t)%16)+16)
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#define LOADW(t) \
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lwz W(t),(t)*4(r4)
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#define STEPD0_LOAD(t) \
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andc r0,RD(t),RB(t); \
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and r6,RB(t),RC(t); \
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rotlwi RT(t),RA(t),5; \
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or r6,r6,r0; \
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add r0,RE(t),r15; \
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add RT(t),RT(t),r6; \
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add r14,r0,W(t); \
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lwz W((t)+4),((t)+4)*4(r4); \
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rotlwi RB(t),RB(t),30; \
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add RT(t),RT(t),r14
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#define STEPD0_UPDATE(t) \
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and r6,RB(t),RC(t); \
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andc r0,RD(t),RB(t); \
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rotlwi RT(t),RA(t),5; \
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rotlwi RB(t),RB(t),30; \
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or r6,r6,r0; \
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add r0,RE(t),r15; \
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xor r5,W((t)+4-3),W((t)+4-8); \
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add RT(t),RT(t),r6; \
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xor W((t)+4),W((t)+4-16),W((t)+4-14); \
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add r0,r0,W(t); \
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xor W((t)+4),W((t)+4),r5; \
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add RT(t),RT(t),r0; \
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rotlwi W((t)+4),W((t)+4),1
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#define STEPD1(t) \
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xor r6,RB(t),RC(t); \
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rotlwi RT(t),RA(t),5; \
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rotlwi RB(t),RB(t),30; \
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xor r6,r6,RD(t); \
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add r0,RE(t),r15; \
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add RT(t),RT(t),r6; \
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add r0,r0,W(t); \
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add RT(t),RT(t),r0
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#define STEPD1_UPDATE(t) \
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xor r6,RB(t),RC(t); \
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rotlwi RT(t),RA(t),5; \
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rotlwi RB(t),RB(t),30; \
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xor r6,r6,RD(t); \
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add r0,RE(t),r15; \
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xor r5,W((t)+4-3),W((t)+4-8); \
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add RT(t),RT(t),r6; \
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xor W((t)+4),W((t)+4-16),W((t)+4-14); \
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add r0,r0,W(t); \
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xor W((t)+4),W((t)+4),r5; \
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add RT(t),RT(t),r0; \
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rotlwi W((t)+4),W((t)+4),1
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#define STEPD2_UPDATE(t) \
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and r6,RB(t),RC(t); \
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and r0,RB(t),RD(t); \
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rotlwi RT(t),RA(t),5; \
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or r6,r6,r0; \
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rotlwi RB(t),RB(t),30; \
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and r0,RC(t),RD(t); \
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xor r5,W((t)+4-3),W((t)+4-8); \
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or r6,r6,r0; \
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xor W((t)+4),W((t)+4-16),W((t)+4-14); \
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add r0,RE(t),r15; \
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add RT(t),RT(t),r6; \
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add r0,r0,W(t); \
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xor W((t)+4),W((t)+4),r5; \
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add RT(t),RT(t),r0; \
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rotlwi W((t)+4),W((t)+4),1
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#define STEP0LD4(t) \
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STEPD0_LOAD(t); \
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STEPD0_LOAD((t)+1); \
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STEPD0_LOAD((t)+2); \
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STEPD0_LOAD((t)+3)
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#define STEPUP4(t, fn) \
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STEP##fn##_UPDATE(t); \
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STEP##fn##_UPDATE((t)+1); \
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STEP##fn##_UPDATE((t)+2); \
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STEP##fn##_UPDATE((t)+3)
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#define STEPUP20(t, fn) \
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STEPUP4(t, fn); \
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STEPUP4((t)+4, fn); \
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STEPUP4((t)+8, fn); \
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STEPUP4((t)+12, fn); \
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STEPUP4((t)+16, fn)
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_GLOBAL(powerpc_sha_transform)
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PPC_STLU r1,-STACKFRAMESIZE(r1)
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SAVE_8GPRS(14, r1)
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SAVE_10GPRS(22, r1)
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/* Load up A - E */
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lwz RA(0),0(r3) /* A */
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lwz RB(0),4(r3) /* B */
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lwz RC(0),8(r3) /* C */
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lwz RD(0),12(r3) /* D */
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lwz RE(0),16(r3) /* E */
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LOADW(0)
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LOADW(1)
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LOADW(2)
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LOADW(3)
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lis r15,0x5a82 /* K0-19 */
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ori r15,r15,0x7999
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STEP0LD4(0)
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STEP0LD4(4)
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STEP0LD4(8)
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STEPUP4(12, D0)
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STEPUP4(16, D0)
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lis r15,0x6ed9 /* K20-39 */
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ori r15,r15,0xeba1
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STEPUP20(20, D1)
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lis r15,0x8f1b /* K40-59 */
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ori r15,r15,0xbcdc
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STEPUP20(40, D2)
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lis r15,0xca62 /* K60-79 */
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ori r15,r15,0xc1d6
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STEPUP4(60, D1)
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STEPUP4(64, D1)
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STEPUP4(68, D1)
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STEPUP4(72, D1)
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lwz r20,16(r3)
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STEPD1(76)
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lwz r19,12(r3)
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STEPD1(77)
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lwz r18,8(r3)
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STEPD1(78)
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lwz r17,4(r3)
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STEPD1(79)
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lwz r16,0(r3)
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add r20,RE(80),r20
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add RD(0),RD(80),r19
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add RC(0),RC(80),r18
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add RB(0),RB(80),r17
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add RA(0),RA(80),r16
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mr RE(0),r20
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stw RA(0),0(r3)
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stw RB(0),4(r3)
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stw RC(0),8(r3)
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stw RD(0),12(r3)
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stw RE(0),16(r3)
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REST_8GPRS(14, r1)
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REST_10GPRS(22, r1)
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addi r1,r1,STACKFRAMESIZE
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blr
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157
arch/powerpc/crypto/sha1.c
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157
arch/powerpc/crypto/sha1.c
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@ -0,0 +1,157 @@
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/*
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* Cryptographic API.
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*
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* powerpc implementation of the SHA1 Secure Hash Algorithm.
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*
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* Derived from cryptoapi implementation, adapted for in-place
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* scatterlist interface.
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*
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* Derived from "crypto/sha1.c"
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* Copyright (c) Alan Smithee.
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
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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 <crypto/internal/hash.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/cryptohash.h>
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#include <linux/types.h>
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#include <crypto/sha.h>
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#include <asm/byteorder.h>
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extern void powerpc_sha_transform(u32 *state, const u8 *src, u32 *temp);
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static int sha1_init(struct shash_desc *desc)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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*sctx = (struct sha1_state){
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.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
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};
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return 0;
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}
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static int sha1_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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unsigned int partial, done;
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const u8 *src;
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partial = sctx->count & 0x3f;
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sctx->count += len;
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done = 0;
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src = data;
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if ((partial + len) > 63) {
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u32 temp[SHA_WORKSPACE_WORDS];
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if (partial) {
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done = -partial;
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memcpy(sctx->buffer + partial, data, done + 64);
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src = sctx->buffer;
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}
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do {
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powerpc_sha_transform(sctx->state, src, temp);
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done += 64;
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src = data + done;
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} while (done + 63 < len);
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memset(temp, 0, sizeof(temp));
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partial = 0;
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}
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memcpy(sctx->buffer + partial, src, len - done);
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return 0;
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}
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/* Add padding and return the message digest. */
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static int sha1_final(struct shash_desc *desc, u8 *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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u32 i, index, padlen;
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__be64 bits;
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static const u8 padding[64] = { 0x80, };
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bits = cpu_to_be64(sctx->count << 3);
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/* Pad out to 56 mod 64 */
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index = sctx->count & 0x3f;
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padlen = (index < 56) ? (56 - index) : ((64+56) - index);
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sha1_update(desc, padding, padlen);
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/* Append length */
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sha1_update(desc, (const u8 *)&bits, sizeof(bits));
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/* Store state in digest */
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for (i = 0; i < 5; i++)
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dst[i] = cpu_to_be32(sctx->state[i]);
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/* Wipe context */
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memset(sctx, 0, sizeof *sctx);
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return 0;
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}
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static int sha1_export(struct shash_desc *desc, void *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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memcpy(out, sctx, sizeof(*sctx));
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return 0;
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}
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static int sha1_import(struct shash_desc *desc, const void *in)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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memcpy(sctx, in, sizeof(*sctx));
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return 0;
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}
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static struct shash_alg alg = {
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.digestsize = SHA1_DIGEST_SIZE,
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.init = sha1_init,
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.update = sha1_update,
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.final = sha1_final,
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.export = sha1_export,
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.import = sha1_import,
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.descsize = sizeof(struct sha1_state),
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.statesize = sizeof(struct sha1_state),
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.base = {
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.cra_name = "sha1",
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.cra_driver_name= "sha1-powerpc",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init sha1_powerpc_mod_init(void)
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{
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return crypto_register_shash(&alg);
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}
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static void __exit sha1_powerpc_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(sha1_powerpc_mod_init);
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module_exit(sha1_powerpc_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
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MODULE_ALIAS("sha1-powerpc");
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@ -479,6 +479,13 @@ config CRYPTO_SHA1_ARM
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SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2) implemented
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using optimized ARM assembler.
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config CRYPTO_SHA1_PPC
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tristate "SHA1 digest algorithm (powerpc)"
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depends on PPC
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help
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This is the powerpc hardware accelerated implementation of the
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SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
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config CRYPTO_SHA256
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tristate "SHA224 and SHA256 digest algorithm"
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select CRYPTO_HASH
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