#include "arm_arch.h"
.text
.code 32
.type rem_4bit,%object
.align 5
rem_4bit:
.short 0x0000,0x1C20,0x3840,0x2460
.short 0x7080,0x6CA0,0x48C0,0x54E0
.short 0xE100,0xFD20,0xD940,0xC560
.short 0x9180,0x8DA0,0xA9C0,0xB5E0
.size rem_4bit,.-rem_4bit
.type rem_4bit_get,%function
rem_4bit_get:
sub r2,pc,#8
sub r2,r2,#32 @ &rem_4bit
b .Lrem_4bit_got
nop
.size rem_4bit_get,.-rem_4bit_get
.global gcm_ghash_4bit
.type gcm_ghash_4bit,%function
gcm_ghash_4bit:
sub r12,pc,#8
add r3,r2,r3 @ r3 to point at the end
stmdb sp!,{r3-r11,lr} @ save r3/end too
sub r12,r12,#48 @ &rem_4bit
ldmia r12,{r4-r11} @ copy rem_4bit ...
stmdb sp!,{r4-r11} @ ... to stack
ldrb r12,[r2,#15]
ldrb r14,[r0,#15]
.Louter:
eor r12,r12,r14
and r14,r12,#0xf0
and r12,r12,#0x0f
mov r3,#14
add r7,r1,r12,lsl#4
ldmia r7,{r4-r7} @ load Htbl[nlo]
add r11,r1,r14
ldrb r12,[r2,#14]
and r14,r4,#0xf @ rem
ldmia r11,{r8-r11} @ load Htbl[nhi]
add r14,r14,r14
eor r4,r8,r4,lsr#4
ldrh r8,[sp,r14] @ rem_4bit[rem]
eor r4,r4,r5,lsl#28
ldrb r14,[r0,#14]
eor r5,r9,r5,lsr#4
eor r5,r5,r6,lsl#28
eor r6,r10,r6,lsr#4
eor r6,r6,r7,lsl#28
eor r7,r11,r7,lsr#4
eor r12,r12,r14
and r14,r12,#0xf0
and r12,r12,#0x0f
eor r7,r7,r8,lsl#16
.Linner:
add r11,r1,r12,lsl#4
and r12,r4,#0xf @ rem
subs r3,r3,#1
add r12,r12,r12
ldmia r11,{r8-r11} @ load Htbl[nlo]
eor r4,r8,r4,lsr#4
eor r4,r4,r5,lsl#28
eor r5,r9,r5,lsr#4
eor r5,r5,r6,lsl#28
ldrh r8,[sp,r12] @ rem_4bit[rem]
eor r6,r10,r6,lsr#4
ldrplb r12,[r2,r3]
eor r6,r6,r7,lsl#28
eor r7,r11,r7,lsr#4
add r11,r1,r14
and r14,r4,#0xf @ rem
eor r7,r7,r8,lsl#16 @ ^= rem_4bit[rem]
add r14,r14,r14
ldmia r11,{r8-r11} @ load Htbl[nhi]
eor r4,r8,r4,lsr#4
ldrplb r8,[r0,r3]
eor r4,r4,r5,lsl#28
eor r5,r9,r5,lsr#4
ldrh r9,[sp,r14]
eor r5,r5,r6,lsl#28
eor r6,r10,r6,lsr#4
eor r6,r6,r7,lsl#28
eorpl r12,r12,r8
eor r7,r11,r7,lsr#4
andpl r14,r12,#0xf0
andpl r12,r12,#0x0f
eor r7,r7,r9,lsl#16 @ ^= rem_4bit[rem]
bpl .Linner
ldr r3,[sp,#32] @ re-load r3/end
add r2,r2,#16
mov r14,r4
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev r4,r4
str r4,[r0,#12]
#elif defined(__ARMEB__)
str r4,[r0,#12]
#else
mov r9,r4,lsr#8
strb r4,[r0,#12+3]
mov r10,r4,lsr#16
strb r9,[r0,#12+2]
mov r11,r4,lsr#24
strb r10,[r0,#12+1]
strb r11,[r0,#12]
#endif
cmp r2,r3
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev r5,r5
str r5,[r0,#8]
#elif defined(__ARMEB__)
str r5,[r0,#8]
#else
mov r9,r5,lsr#8
strb r5,[r0,#8+3]
mov r10,r5,lsr#16
strb r9,[r0,#8+2]
mov r11,r5,lsr#24
strb r10,[r0,#8+1]
strb r11,[r0,#8]
#endif
ldrneb r12,[r2,#15]
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev r6,r6
str r6,[r0,#4]
#elif defined(__ARMEB__)
str r6,[r0,#4]
#else
mov r9,r6,lsr#8
strb r6,[r0,#4+3]
mov r10,r6,lsr#16
strb r9,[r0,#4+2]
mov r11,r6,lsr#24
strb r10,[r0,#4+1]
strb r11,[r0,#4]
#endif
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev r7,r7
str r7,[r0,#0]
#elif defined(__ARMEB__)
str r7,[r0,#0]
#else
mov r9,r7,lsr#8
strb r7,[r0,#0+3]
mov r10,r7,lsr#16
strb r9,[r0,#0+2]
mov r11,r7,lsr#24
strb r10,[r0,#0+1]
strb r11,[r0,#0]
#endif
bne .Louter
add sp,sp,#36
#if __ARM_ARCH__>=5
ldmia sp!,{r4-r11,pc}
#else
ldmia sp!,{r4-r11,lr}
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
.word 0xe12fff1e @ interoperable with Thumb ISA:-)
#endif
.size gcm_ghash_4bit,.-gcm_ghash_4bit
.global gcm_gmult_4bit
.type gcm_gmult_4bit,%function
gcm_gmult_4bit:
stmdb sp!,{r4-r11,lr}
ldrb r12,[r0,#15]
b rem_4bit_get
.Lrem_4bit_got:
and r14,r12,#0xf0
and r12,r12,#0x0f
mov r3,#14
add r7,r1,r12,lsl#4
ldmia r7,{r4-r7} @ load Htbl[nlo]
ldrb r12,[r0,#14]
add r11,r1,r14
and r14,r4,#0xf @ rem
ldmia r11,{r8-r11} @ load Htbl[nhi]
add r14,r14,r14
eor r4,r8,r4,lsr#4
ldrh r8,[r2,r14] @ rem_4bit[rem]
eor r4,r4,r5,lsl#28
eor r5,r9,r5,lsr#4
eor r5,r5,r6,lsl#28
eor r6,r10,r6,lsr#4
eor r6,r6,r7,lsl#28
eor r7,r11,r7,lsr#4
and r14,r12,#0xf0
eor r7,r7,r8,lsl#16
and r12,r12,#0x0f
.Loop:
add r11,r1,r12,lsl#4
and r12,r4,#0xf @ rem
subs r3,r3,#1
add r12,r12,r12
ldmia r11,{r8-r11} @ load Htbl[nlo]
eor r4,r8,r4,lsr#4
eor r4,r4,r5,lsl#28
eor r5,r9,r5,lsr#4
eor r5,r5,r6,lsl#28
ldrh r8,[r2,r12] @ rem_4bit[rem]
eor r6,r10,r6,lsr#4
ldrplb r12,[r0,r3]
eor r6,r6,r7,lsl#28
eor r7,r11,r7,lsr#4
add r11,r1,r14
and r14,r4,#0xf @ rem
eor r7,r7,r8,lsl#16 @ ^= rem_4bit[rem]
add r14,r14,r14
ldmia r11,{r8-r11} @ load Htbl[nhi]
eor r4,r8,r4,lsr#4
eor r4,r4,r5,lsl#28
eor r5,r9,r5,lsr#4
ldrh r8,[r2,r14] @ rem_4bit[rem]
eor r5,r5,r6,lsl#28
eor r6,r10,r6,lsr#4
eor r6,r6,r7,lsl#28
eor r7,r11,r7,lsr#4
andpl r14,r12,#0xf0
andpl r12,r12,#0x0f
eor r7,r7,r8,lsl#16 @ ^= rem_4bit[rem]
bpl .Loop
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev r4,r4
str r4,[r0,#12]
#elif defined(__ARMEB__)
str r4,[r0,#12]
#else
mov r9,r4,lsr#8
strb r4,[r0,#12+3]
mov r10,r4,lsr#16
strb r9,[r0,#12+2]
mov r11,r4,lsr#24
strb r10,[r0,#12+1]
strb r11,[r0,#12]
#endif
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev r5,r5
str r5,[r0,#8]
#elif defined(__ARMEB__)
str r5,[r0,#8]
#else
mov r9,r5,lsr#8
strb r5,[r0,#8+3]
mov r10,r5,lsr#16
strb r9,[r0,#8+2]
mov r11,r5,lsr#24
strb r10,[r0,#8+1]
strb r11,[r0,#8]
#endif
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev r6,r6
str r6,[r0,#4]
#elif defined(__ARMEB__)
str r6,[r0,#4]
#else
mov r9,r6,lsr#8
strb r6,[r0,#4+3]
mov r10,r6,lsr#16
strb r9,[r0,#4+2]
mov r11,r6,lsr#24
strb r10,[r0,#4+1]
strb r11,[r0,#4]
#endif
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev r7,r7
str r7,[r0,#0]
#elif defined(__ARMEB__)
str r7,[r0,#0]
#else
mov r9,r7,lsr#8
strb r7,[r0,#0+3]
mov r10,r7,lsr#16
strb r9,[r0,#0+2]
mov r11,r7,lsr#24
strb r10,[r0,#0+1]
strb r11,[r0,#0]
#endif
#if __ARM_ARCH__>=5
ldmia sp!,{r4-r11,pc}
#else
ldmia sp!,{r4-r11,lr}
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
.word 0xe12fff1e @ interoperable with Thumb ISA:-)
#endif
.size gcm_gmult_4bit,.-gcm_gmult_4bit
#if __ARM_ARCH__>=7
.fpu neon
.global gcm_gmult_neon
.type gcm_gmult_neon,%function
.align 4
gcm_gmult_neon:
sub r1,#16 @ point at H in GCM128_CTX
vld1.64 d29,[r0,:64]!@ load Xi
vmov.i32 d5,#0xe1 @ our irreducible polynomial
vld1.64 d28,[r0,:64]!
vshr.u64 d5,#32
vldmia r1,{d0-d1} @ load H
veor q12,q12
#ifdef __ARMEL__
vrev64.8 q14,q14
#endif
veor q13,q13
veor q11,q11
mov r1,#16
veor q10,q10
mov r3,#16
veor d2,d2
vdup.8 d4,d28[0] @ broadcast lowest byte
b .Linner_neon
.size gcm_gmult_neon,.-gcm_gmult_neon
.global gcm_ghash_neon
.type gcm_ghash_neon,%function
.align 4
gcm_ghash_neon:
vld1.64 d21,[r0,:64]! @ load Xi
vmov.i32 d5,#0xe1 @ our irreducible polynomial
vld1.64 d20,[r0,:64]!
vshr.u64 d5,#32
vldmia r0,{d0-d1} @ load H
veor q12,q12
nop
#ifdef __ARMEL__
vrev64.8 q10,q10
#endif
.Louter_neon:
vld1.64 d29,[r2]! @ load inp
veor q13,q13
vld1.64 d28,[r2]!
veor q11,q11
mov r1,#16
#ifdef __ARMEL__
vrev64.8 q14,q14
#endif
veor d2,d2
veor q14,q10 @ inp^=Xi
veor q10,q10
vdup.8 d4,d28[0] @ broadcast lowest byte
.Linner_neon:
subs r1,r1,#1
vmull.p8 q9,d1,d4 @ H.lo·Xi[i]
vmull.p8 q8,d0,d4 @ H.hi·Xi[i]
vext.8 q14,q12,#1 @ IN>>=8
veor q10,q13 @ modulo-scheduled part
vshl.i64 d22,#48
vdup.8 d4,d28[0] @ broadcast lowest byte
veor d3,d18,d20
veor d21,d22
vuzp.8 q9,q8
vsli.8 d2,d3,#1 @ compose the "carry" byte
vext.8 q10,q12,#1 @ Z>>=8
vmull.p8 q11,d2,d5 @ "carry"·0xe1
vshr.u8 d2,d3,#7 @ save Z's bottom bit
vext.8 q13,q9,q12,#1 @ Qlo>>=8
veor q10,q8
bne .Linner_neon
veor q10,q13 @ modulo-scheduled artefact
vshl.i64 d22,#48
veor d21,d22
@ finalization, normalize Z:Zo
vand d2,d5 @ suffices to mask the bit
vshr.u64 d3,d20,#63
vshl.i64 q10,#1
subs r3,#16
vorr q10,q1 @ Z=Z:Zo<<1
bne .Louter_neon
#ifdef __ARMEL__
vrev64.8 q10,q10
#endif
sub r0,#16
vst1.64 d21,[r0,:64]! @ write out Xi
vst1.64 d20,[r0,:64]
.word 0xe12fff1e
.size gcm_ghash_neon,.-gcm_ghash_neon
#endif
.asciz "GHASH for ARMv4/NEON, CRYPTOGAMS by <appro@openssl.org>"
.align 2