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ClickHouse/contrib/boringssl-cmake/ios-arm/crypto/fipsmodule/vpaes-armv7.S
Alexey Milovidov bbc0c3eb1f Add BoringSSL, generate CMakeFiles
2020-12-16 19:30:23 +03:00

1266 lines
39 KiB
ArmAsm
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// This file is generated from a similarly-named Perl script in the BoringSSL
// source tree. Do not edit by hand.
#if !defined(__has_feature)
#define __has_feature(x) 0
#endif
#if __has_feature(memory_sanitizer) && !defined(OPENSSL_NO_ASM)
#define OPENSSL_NO_ASM
#endif
#if !defined(OPENSSL_NO_ASM)
#if defined(BORINGSSL_PREFIX)
#include <boringssl_prefix_symbols_asm.h>
#endif
.syntax unified
#if defined(__thumb2__)
.thumb
#else
.code 32
#endif
.text
.align 7 @ totally strategic alignment
_vpaes_consts:
Lk_mc_forward:@ mc_forward
.quad 0x0407060500030201, 0x0C0F0E0D080B0A09
.quad 0x080B0A0904070605, 0x000302010C0F0E0D
.quad 0x0C0F0E0D080B0A09, 0x0407060500030201
.quad 0x000302010C0F0E0D, 0x080B0A0904070605
Lk_mc_backward:@ mc_backward
.quad 0x0605040702010003, 0x0E0D0C0F0A09080B
.quad 0x020100030E0D0C0F, 0x0A09080B06050407
.quad 0x0E0D0C0F0A09080B, 0x0605040702010003
.quad 0x0A09080B06050407, 0x020100030E0D0C0F
Lk_sr:@ sr
.quad 0x0706050403020100, 0x0F0E0D0C0B0A0908
.quad 0x030E09040F0A0500, 0x0B06010C07020D08
.quad 0x0F060D040B020900, 0x070E050C030A0108
.quad 0x0B0E0104070A0D00, 0x0306090C0F020508
@
@ "Hot" constants
@
Lk_inv:@ inv, inva
.quad 0x0E05060F0D080180, 0x040703090A0B0C02
.quad 0x01040A060F0B0780, 0x030D0E0C02050809
Lk_ipt:@ input transform (lo, hi)
.quad 0xC2B2E8985A2A7000, 0xCABAE09052227808
.quad 0x4C01307D317C4D00, 0xCD80B1FCB0FDCC81
Lk_sbo:@ sbou, sbot
.quad 0xD0D26D176FBDC700, 0x15AABF7AC502A878
.quad 0xCFE474A55FBB6A00, 0x8E1E90D1412B35FA
Lk_sb1:@ sb1u, sb1t
.quad 0x3618D415FAE22300, 0x3BF7CCC10D2ED9EF
.quad 0xB19BE18FCB503E00, 0xA5DF7A6E142AF544
Lk_sb2:@ sb2u, sb2t
.quad 0x69EB88400AE12900, 0xC2A163C8AB82234A
.quad 0xE27A93C60B712400, 0x5EB7E955BC982FCD
.byte 86,101,99,116,111,114,32,80,101,114,109,117,116,97,116,105,111,110,32,65,69,83,32,102,111,114,32,65,82,77,118,55,32,78,69,79,78,44,32,77,105,107,101,32,72,97,109,98,117,114,103,32,40,83,116,97,110,102,111,114,100,32,85,110,105,118,101,114,115,105,116,121,41,0
.align 2
.align 6
@@
@@ _aes_preheat
@@
@@ Fills q9-q15 as specified below.
@@
#ifdef __thumb2__
.thumb_func _vpaes_preheat
#endif
.align 4
_vpaes_preheat:
adr r10, Lk_inv
vmov.i8 q9, #0x0f @ Lk_s0F
vld1.64 {q10,q11}, [r10]! @ Lk_inv
add r10, r10, #64 @ Skip Lk_ipt, Lk_sbo
vld1.64 {q12,q13}, [r10]! @ Lk_sb1
vld1.64 {q14,q15}, [r10] @ Lk_sb2
bx lr
@@
@@ _aes_encrypt_core
@@
@@ AES-encrypt q0.
@@
@@ Inputs:
@@ q0 = input
@@ q9-q15 as in _vpaes_preheat
@@ [r2] = scheduled keys
@@
@@ Output in q0
@@ Clobbers q1-q5, r8-r11
@@ Preserves q6-q8 so you get some local vectors
@@
@@
#ifdef __thumb2__
.thumb_func _vpaes_encrypt_core
#endif
.align 4
_vpaes_encrypt_core:
mov r9, r2
ldr r8, [r2,#240] @ pull rounds
adr r11, Lk_ipt
@ vmovdqa .Lk_ipt(%rip), %xmm2 # iptlo
@ vmovdqa .Lk_ipt+16(%rip), %xmm3 # ipthi
vld1.64 {q2, q3}, [r11]
adr r11, Lk_mc_forward+16
vld1.64 {q5}, [r9]! @ vmovdqu (%r9), %xmm5 # round0 key
vand q1, q0, q9 @ vpand %xmm9, %xmm0, %xmm1
vshr.u8 q0, q0, #4 @ vpsrlb $4, %xmm0, %xmm0
vtbl.8 d2, {q2}, d2 @ vpshufb %xmm1, %xmm2, %xmm1
vtbl.8 d3, {q2}, d3
vtbl.8 d4, {q3}, d0 @ vpshufb %xmm0, %xmm3, %xmm2
vtbl.8 d5, {q3}, d1
veor q0, q1, q5 @ vpxor %xmm5, %xmm1, %xmm0
veor q0, q0, q2 @ vpxor %xmm2, %xmm0, %xmm0
@ .Lenc_entry ends with a bnz instruction which is normally paired with
@ subs in .Lenc_loop.
tst r8, r8
b Lenc_entry
.align 4
Lenc_loop:
@ middle of middle round
add r10, r11, #0x40
vtbl.8 d8, {q13}, d4 @ vpshufb %xmm2, %xmm13, %xmm4 # 4 = sb1u
vtbl.8 d9, {q13}, d5
vld1.64 {q1}, [r11]! @ vmovdqa -0x40(%r11,%r10), %xmm1 # Lk_mc_forward[]
vtbl.8 d0, {q12}, d6 @ vpshufb %xmm3, %xmm12, %xmm0 # 0 = sb1t
vtbl.8 d1, {q12}, d7
veor q4, q4, q5 @ vpxor %xmm5, %xmm4, %xmm4 # 4 = sb1u + k
vtbl.8 d10, {q15}, d4 @ vpshufb %xmm2, %xmm15, %xmm5 # 4 = sb2u
vtbl.8 d11, {q15}, d5
veor q0, q0, q4 @ vpxor %xmm4, %xmm0, %xmm0 # 0 = A
vtbl.8 d4, {q14}, d6 @ vpshufb %xmm3, %xmm14, %xmm2 # 2 = sb2t
vtbl.8 d5, {q14}, d7
vld1.64 {q4}, [r10] @ vmovdqa (%r11,%r10), %xmm4 # Lk_mc_backward[]
vtbl.8 d6, {q0}, d2 @ vpshufb %xmm1, %xmm0, %xmm3 # 0 = B
vtbl.8 d7, {q0}, d3
veor q2, q2, q5 @ vpxor %xmm5, %xmm2, %xmm2 # 2 = 2A
@ Write to q5 instead of q0, so the table and destination registers do
@ not overlap.
vtbl.8 d10, {q0}, d8 @ vpshufb %xmm4, %xmm0, %xmm0 # 3 = D
vtbl.8 d11, {q0}, d9
veor q3, q3, q2 @ vpxor %xmm2, %xmm3, %xmm3 # 0 = 2A+B
vtbl.8 d8, {q3}, d2 @ vpshufb %xmm1, %xmm3, %xmm4 # 0 = 2B+C
vtbl.8 d9, {q3}, d3
@ Here we restore the original q0/q5 usage.
veor q0, q5, q3 @ vpxor %xmm3, %xmm0, %xmm0 # 3 = 2A+B+D
and r11, r11, #~(1<<6) @ and $0x30, %r11 # ... mod 4
veor q0, q0, q4 @ vpxor %xmm4, %xmm0, %xmm0 # 0 = 2A+3B+C+D
subs r8, r8, #1 @ nr--
Lenc_entry:
@ top of round
vand q1, q0, q9 @ vpand %xmm0, %xmm9, %xmm1 # 0 = k
vshr.u8 q0, q0, #4 @ vpsrlb $4, %xmm0, %xmm0 # 1 = i
vtbl.8 d10, {q11}, d2 @ vpshufb %xmm1, %xmm11, %xmm5 # 2 = a/k
vtbl.8 d11, {q11}, d3
veor q1, q1, q0 @ vpxor %xmm0, %xmm1, %xmm1 # 0 = j
vtbl.8 d6, {q10}, d0 @ vpshufb %xmm0, %xmm10, %xmm3 # 3 = 1/i
vtbl.8 d7, {q10}, d1
vtbl.8 d8, {q10}, d2 @ vpshufb %xmm1, %xmm10, %xmm4 # 4 = 1/j
vtbl.8 d9, {q10}, d3
veor q3, q3, q5 @ vpxor %xmm5, %xmm3, %xmm3 # 3 = iak = 1/i + a/k
veor q4, q4, q5 @ vpxor %xmm5, %xmm4, %xmm4 # 4 = jak = 1/j + a/k
vtbl.8 d4, {q10}, d6 @ vpshufb %xmm3, %xmm10, %xmm2 # 2 = 1/iak
vtbl.8 d5, {q10}, d7
vtbl.8 d6, {q10}, d8 @ vpshufb %xmm4, %xmm10, %xmm3 # 3 = 1/jak
vtbl.8 d7, {q10}, d9
veor q2, q2, q1 @ vpxor %xmm1, %xmm2, %xmm2 # 2 = io
veor q3, q3, q0 @ vpxor %xmm0, %xmm3, %xmm3 # 3 = jo
vld1.64 {q5}, [r9]! @ vmovdqu (%r9), %xmm5
bne Lenc_loop
@ middle of last round
add r10, r11, #0x80
adr r11, Lk_sbo
@ Read to q1 instead of q4, so the vtbl.8 instruction below does not
@ overlap table and destination registers.
vld1.64 {q1}, [r11]! @ vmovdqa -0x60(%r10), %xmm4 # 3 : sbou
vld1.64 {q0}, [r11] @ vmovdqa -0x50(%r10), %xmm0 # 0 : sbot Lk_sbo+16
vtbl.8 d8, {q1}, d4 @ vpshufb %xmm2, %xmm4, %xmm4 # 4 = sbou
vtbl.8 d9, {q1}, d5
vld1.64 {q1}, [r10] @ vmovdqa 0x40(%r11,%r10), %xmm1 # Lk_sr[]
@ Write to q2 instead of q0 below, to avoid overlapping table and
@ destination registers.
vtbl.8 d4, {q0}, d6 @ vpshufb %xmm3, %xmm0, %xmm0 # 0 = sb1t
vtbl.8 d5, {q0}, d7
veor q4, q4, q5 @ vpxor %xmm5, %xmm4, %xmm4 # 4 = sb1u + k
veor q2, q2, q4 @ vpxor %xmm4, %xmm0, %xmm0 # 0 = A
@ Here we restore the original q0/q2 usage.
vtbl.8 d0, {q2}, d2 @ vpshufb %xmm1, %xmm0, %xmm0
vtbl.8 d1, {q2}, d3
bx lr
.globl _vpaes_encrypt
.private_extern _vpaes_encrypt
#ifdef __thumb2__
.thumb_func _vpaes_encrypt
#endif
.align 4
_vpaes_encrypt:
@ _vpaes_encrypt_core uses r8-r11. Round up to r7-r11 to maintain stack
@ alignment.
stmdb sp!, {r7,r8,r9,r10,r11,lr}
@ _vpaes_encrypt_core uses q4-q5 (d8-d11), which are callee-saved.
vstmdb sp!, {d8,d9,d10,d11}
vld1.64 {q0}, [r0]
bl _vpaes_preheat
bl _vpaes_encrypt_core
vst1.64 {q0}, [r1]
vldmia sp!, {d8,d9,d10,d11}
ldmia sp!, {r7,r8,r9,r10,r11, pc} @ return
@
@ Decryption stuff
@
.align 4
_vpaes_decrypt_consts:
Lk_dipt:@ decryption input transform
.quad 0x0F505B040B545F00, 0x154A411E114E451A
.quad 0x86E383E660056500, 0x12771772F491F194
Lk_dsbo:@ decryption sbox final output
.quad 0x1387EA537EF94000, 0xC7AA6DB9D4943E2D
.quad 0x12D7560F93441D00, 0xCA4B8159D8C58E9C
Lk_dsb9:@ decryption sbox output *9*u, *9*t
.quad 0x851C03539A86D600, 0xCAD51F504F994CC9
.quad 0xC03B1789ECD74900, 0x725E2C9EB2FBA565
Lk_dsbd:@ decryption sbox output *D*u, *D*t
.quad 0x7D57CCDFE6B1A200, 0xF56E9B13882A4439
.quad 0x3CE2FAF724C6CB00, 0x2931180D15DEEFD3
Lk_dsbb:@ decryption sbox output *B*u, *B*t
.quad 0xD022649296B44200, 0x602646F6B0F2D404
.quad 0xC19498A6CD596700, 0xF3FF0C3E3255AA6B
Lk_dsbe:@ decryption sbox output *E*u, *E*t
.quad 0x46F2929626D4D000, 0x2242600464B4F6B0
.quad 0x0C55A6CDFFAAC100, 0x9467F36B98593E32
@@
@@ Decryption core
@@
@@ Same API as encryption core, except it clobbers q12-q15 rather than using
@@ the values from _vpaes_preheat. q9-q11 must still be set from
@@ _vpaes_preheat.
@@
#ifdef __thumb2__
.thumb_func _vpaes_decrypt_core
#endif
.align 4
_vpaes_decrypt_core:
mov r9, r2
ldr r8, [r2,#240] @ pull rounds
@ This function performs shuffles with various constants. The x86_64
@ version loads them on-demand into %xmm0-%xmm5. This does not work well
@ for ARMv7 because those registers are shuffle destinations. The ARMv8
@ version preloads those constants into registers, but ARMv7 has half
@ the registers to work with. Instead, we load them on-demand into
@ q12-q15, registers normally use for preloaded constants. This is fine
@ because decryption doesn't use those constants. The values are
@ constant, so this does not interfere with potential 2x optimizations.
adr r7, Lk_dipt
vld1.64 {q12,q13}, [r7] @ vmovdqa Lk_dipt(%rip), %xmm2 # iptlo
lsl r11, r8, #4 @ mov %rax, %r11; shl $4, %r11
eor r11, r11, #0x30 @ xor $0x30, %r11
adr r10, Lk_sr
and r11, r11, #0x30 @ and $0x30, %r11
add r11, r11, r10
adr r10, Lk_mc_forward+48
vld1.64 {q4}, [r9]! @ vmovdqu (%r9), %xmm4 # round0 key
vand q1, q0, q9 @ vpand %xmm9, %xmm0, %xmm1
vshr.u8 q0, q0, #4 @ vpsrlb $4, %xmm0, %xmm0
vtbl.8 d4, {q12}, d2 @ vpshufb %xmm1, %xmm2, %xmm2
vtbl.8 d5, {q12}, d3
vld1.64 {q5}, [r10] @ vmovdqa Lk_mc_forward+48(%rip), %xmm5
@ vmovdqa .Lk_dipt+16(%rip), %xmm1 # ipthi
vtbl.8 d0, {q13}, d0 @ vpshufb %xmm0, %xmm1, %xmm0
vtbl.8 d1, {q13}, d1
veor q2, q2, q4 @ vpxor %xmm4, %xmm2, %xmm2
veor q0, q0, q2 @ vpxor %xmm2, %xmm0, %xmm0
@ .Ldec_entry ends with a bnz instruction which is normally paired with
@ subs in .Ldec_loop.
tst r8, r8
b Ldec_entry
.align 4
Ldec_loop:
@
@ Inverse mix columns
@
@ We load .Lk_dsb* into q12-q15 on-demand. See the comment at the top of
@ the function.
adr r10, Lk_dsb9
vld1.64 {q12,q13}, [r10]! @ vmovdqa -0x20(%r10),%xmm4 # 4 : sb9u
@ vmovdqa -0x10(%r10),%xmm1 # 0 : sb9t
@ Load sbd* ahead of time.
vld1.64 {q14,q15}, [r10]! @ vmovdqa 0x00(%r10),%xmm4 # 4 : sbdu
@ vmovdqa 0x10(%r10),%xmm1 # 0 : sbdt
vtbl.8 d8, {q12}, d4 @ vpshufb %xmm2, %xmm4, %xmm4 # 4 = sb9u
vtbl.8 d9, {q12}, d5
vtbl.8 d2, {q13}, d6 @ vpshufb %xmm3, %xmm1, %xmm1 # 0 = sb9t
vtbl.8 d3, {q13}, d7
veor q0, q4, q0 @ vpxor %xmm4, %xmm0, %xmm0
veor q0, q0, q1 @ vpxor %xmm1, %xmm0, %xmm0 # 0 = ch
@ Load sbb* ahead of time.
vld1.64 {q12,q13}, [r10]! @ vmovdqa 0x20(%r10),%xmm4 # 4 : sbbu
@ vmovdqa 0x30(%r10),%xmm1 # 0 : sbbt
vtbl.8 d8, {q14}, d4 @ vpshufb %xmm2, %xmm4, %xmm4 # 4 = sbdu
vtbl.8 d9, {q14}, d5
@ Write to q1 instead of q0, so the table and destination registers do
@ not overlap.
vtbl.8 d2, {q0}, d10 @ vpshufb %xmm5, %xmm0, %xmm0 # MC ch
vtbl.8 d3, {q0}, d11
@ Here we restore the original q0/q1 usage. This instruction is
@ reordered from the ARMv8 version so we do not clobber the vtbl.8
@ below.
veor q0, q1, q4 @ vpxor %xmm4, %xmm0, %xmm0 # 4 = ch
vtbl.8 d2, {q15}, d6 @ vpshufb %xmm3, %xmm1, %xmm1 # 0 = sbdt
vtbl.8 d3, {q15}, d7
@ vmovdqa 0x20(%r10), %xmm4 # 4 : sbbu
veor q0, q0, q1 @ vpxor %xmm1, %xmm0, %xmm0 # 0 = ch
@ vmovdqa 0x30(%r10), %xmm1 # 0 : sbbt
@ Load sbd* ahead of time.
vld1.64 {q14,q15}, [r10]! @ vmovdqa 0x40(%r10),%xmm4 # 4 : sbeu
@ vmovdqa 0x50(%r10),%xmm1 # 0 : sbet
vtbl.8 d8, {q12}, d4 @ vpshufb %xmm2, %xmm4, %xmm4 # 4 = sbbu
vtbl.8 d9, {q12}, d5
@ Write to q1 instead of q0, so the table and destination registers do
@ not overlap.
vtbl.8 d2, {q0}, d10 @ vpshufb %xmm5, %xmm0, %xmm0 # MC ch
vtbl.8 d3, {q0}, d11
@ Here we restore the original q0/q1 usage. This instruction is
@ reordered from the ARMv8 version so we do not clobber the vtbl.8
@ below.
veor q0, q1, q4 @ vpxor %xmm4, %xmm0, %xmm0 # 4 = ch
vtbl.8 d2, {q13}, d6 @ vpshufb %xmm3, %xmm1, %xmm1 # 0 = sbbt
vtbl.8 d3, {q13}, d7
veor q0, q0, q1 @ vpxor %xmm1, %xmm0, %xmm0 # 0 = ch
vtbl.8 d8, {q14}, d4 @ vpshufb %xmm2, %xmm4, %xmm4 # 4 = sbeu
vtbl.8 d9, {q14}, d5
@ Write to q1 instead of q0, so the table and destination registers do
@ not overlap.
vtbl.8 d2, {q0}, d10 @ vpshufb %xmm5, %xmm0, %xmm0 # MC ch
vtbl.8 d3, {q0}, d11
@ Here we restore the original q0/q1 usage. This instruction is
@ reordered from the ARMv8 version so we do not clobber the vtbl.8
@ below.
veor q0, q1, q4 @ vpxor %xmm4, %xmm0, %xmm0 # 4 = ch
vtbl.8 d2, {q15}, d6 @ vpshufb %xmm3, %xmm1, %xmm1 # 0 = sbet
vtbl.8 d3, {q15}, d7
vext.8 q5, q5, q5, #12 @ vpalignr $12, %xmm5, %xmm5, %xmm5
veor q0, q0, q1 @ vpxor %xmm1, %xmm0, %xmm0 # 0 = ch
subs r8, r8, #1 @ sub $1,%rax # nr--
Ldec_entry:
@ top of round
vand q1, q0, q9 @ vpand %xmm9, %xmm0, %xmm1 # 0 = k
vshr.u8 q0, q0, #4 @ vpsrlb $4, %xmm0, %xmm0 # 1 = i
vtbl.8 d4, {q11}, d2 @ vpshufb %xmm1, %xmm11, %xmm2 # 2 = a/k
vtbl.8 d5, {q11}, d3
veor q1, q1, q0 @ vpxor %xmm0, %xmm1, %xmm1 # 0 = j
vtbl.8 d6, {q10}, d0 @ vpshufb %xmm0, %xmm10, %xmm3 # 3 = 1/i
vtbl.8 d7, {q10}, d1
vtbl.8 d8, {q10}, d2 @ vpshufb %xmm1, %xmm10, %xmm4 # 4 = 1/j
vtbl.8 d9, {q10}, d3
veor q3, q3, q2 @ vpxor %xmm2, %xmm3, %xmm3 # 3 = iak = 1/i + a/k
veor q4, q4, q2 @ vpxor %xmm2, %xmm4, %xmm4 # 4 = jak = 1/j + a/k
vtbl.8 d4, {q10}, d6 @ vpshufb %xmm3, %xmm10, %xmm2 # 2 = 1/iak
vtbl.8 d5, {q10}, d7
vtbl.8 d6, {q10}, d8 @ vpshufb %xmm4, %xmm10, %xmm3 # 3 = 1/jak
vtbl.8 d7, {q10}, d9
veor q2, q2, q1 @ vpxor %xmm1, %xmm2, %xmm2 # 2 = io
veor q3, q3, q0 @ vpxor %xmm0, %xmm3, %xmm3 # 3 = jo
vld1.64 {q0}, [r9]! @ vmovdqu (%r9), %xmm0
bne Ldec_loop
@ middle of last round
adr r10, Lk_dsbo
@ Write to q1 rather than q4 to avoid overlapping table and destination.
vld1.64 {q1}, [r10]! @ vmovdqa 0x60(%r10), %xmm4 # 3 : sbou
vtbl.8 d8, {q1}, d4 @ vpshufb %xmm2, %xmm4, %xmm4 # 4 = sbou
vtbl.8 d9, {q1}, d5
@ Write to q2 rather than q1 to avoid overlapping table and destination.
vld1.64 {q2}, [r10] @ vmovdqa 0x70(%r10), %xmm1 # 0 : sbot
vtbl.8 d2, {q2}, d6 @ vpshufb %xmm3, %xmm1, %xmm1 # 0 = sb1t
vtbl.8 d3, {q2}, d7
vld1.64 {q2}, [r11] @ vmovdqa -0x160(%r11), %xmm2 # Lk_sr-Lk_dsbd=-0x160
veor q4, q4, q0 @ vpxor %xmm0, %xmm4, %xmm4 # 4 = sb1u + k
@ Write to q1 rather than q0 so the table and destination registers
@ below do not overlap.
veor q1, q1, q4 @ vpxor %xmm4, %xmm1, %xmm0 # 0 = A
vtbl.8 d0, {q1}, d4 @ vpshufb %xmm2, %xmm0, %xmm0
vtbl.8 d1, {q1}, d5
bx lr
.globl _vpaes_decrypt
.private_extern _vpaes_decrypt
#ifdef __thumb2__
.thumb_func _vpaes_decrypt
#endif
.align 4
_vpaes_decrypt:
@ _vpaes_decrypt_core uses r7-r11.
stmdb sp!, {r7,r8,r9,r10,r11,lr}
@ _vpaes_decrypt_core uses q4-q5 (d8-d11), which are callee-saved.
vstmdb sp!, {d8,d9,d10,d11}
vld1.64 {q0}, [r0]
bl _vpaes_preheat
bl _vpaes_decrypt_core
vst1.64 {q0}, [r1]
vldmia sp!, {d8,d9,d10,d11}
ldmia sp!, {r7,r8,r9,r10,r11, pc} @ return
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@ @@
@@ AES key schedule @@
@@ @@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ This function diverges from both x86_64 and armv7 in which constants are
@ pinned. x86_64 has a common preheat function for all operations. aarch64
@ separates them because it has enough registers to pin nearly all constants.
@ armv7 does not have enough registers, but needing explicit loads and stores
@ also complicates using x86_64's register allocation directly.
@
@ We pin some constants for convenience and leave q14 and q15 free to load
@ others on demand.
@
@ Key schedule constants
@
.align 4
_vpaes_key_consts:
Lk_dksd:@ decryption key schedule: invskew x*D
.quad 0xFEB91A5DA3E44700, 0x0740E3A45A1DBEF9
.quad 0x41C277F4B5368300, 0x5FDC69EAAB289D1E
Lk_dksb:@ decryption key schedule: invskew x*B
.quad 0x9A4FCA1F8550D500, 0x03D653861CC94C99
.quad 0x115BEDA7B6FC4A00, 0xD993256F7E3482C8
Lk_dkse:@ decryption key schedule: invskew x*E + 0x63
.quad 0xD5031CCA1FC9D600, 0x53859A4C994F5086
.quad 0xA23196054FDC7BE8, 0xCD5EF96A20B31487
Lk_dks9:@ decryption key schedule: invskew x*9
.quad 0xB6116FC87ED9A700, 0x4AED933482255BFC
.quad 0x4576516227143300, 0x8BB89FACE9DAFDCE
Lk_rcon:@ rcon
.quad 0x1F8391B9AF9DEEB6, 0x702A98084D7C7D81
Lk_opt:@ output transform
.quad 0xFF9F4929D6B66000, 0xF7974121DEBE6808
.quad 0x01EDBD5150BCEC00, 0xE10D5DB1B05C0CE0
Lk_deskew:@ deskew tables: inverts the sbox's "skew"
.quad 0x07E4A34047A4E300, 0x1DFEB95A5DBEF91A
.quad 0x5F36B5DC83EA6900, 0x2841C2ABF49D1E77
#ifdef __thumb2__
.thumb_func _vpaes_key_preheat
#endif
.align 4
_vpaes_key_preheat:
adr r11, Lk_rcon
vmov.i8 q12, #0x5b @ Lk_s63
adr r10, Lk_inv @ Must be aligned to 8 mod 16.
vmov.i8 q9, #0x0f @ Lk_s0F
vld1.64 {q10,q11}, [r10] @ Lk_inv
vld1.64 {q8}, [r11] @ Lk_rcon
bx lr
#ifdef __thumb2__
.thumb_func _vpaes_schedule_core
#endif
.align 4
_vpaes_schedule_core:
@ We only need to save lr, but ARM requires an 8-byte stack alignment,
@ so save an extra register.
stmdb sp!, {r3,lr}
bl _vpaes_key_preheat @ load the tables
adr r11, Lk_ipt @ Must be aligned to 8 mod 16.
vld1.64 {q0}, [r0]! @ vmovdqu (%rdi), %xmm0 # load key (unaligned)
@ input transform
@ Use q4 here rather than q3 so .Lschedule_am_decrypting does not
@ overlap table and destination.
vmov q4, q0 @ vmovdqa %xmm0, %xmm3
bl _vpaes_schedule_transform
adr r10, Lk_sr @ Must be aligned to 8 mod 16.
vmov q7, q0 @ vmovdqa %xmm0, %xmm7
add r8, r8, r10
tst r3, r3
bne Lschedule_am_decrypting
@ encrypting, output zeroth round key after transform
vst1.64 {q0}, [r2] @ vmovdqu %xmm0, (%rdx)
b Lschedule_go
Lschedule_am_decrypting:
@ decrypting, output zeroth round key after shiftrows
vld1.64 {q1}, [r8] @ vmovdqa (%r8,%r10), %xmm1
vtbl.8 d6, {q4}, d2 @ vpshufb %xmm1, %xmm3, %xmm3
vtbl.8 d7, {q4}, d3
vst1.64 {q3}, [r2] @ vmovdqu %xmm3, (%rdx)
eor r8, r8, #0x30 @ xor $0x30, %r8
Lschedule_go:
cmp r1, #192 @ cmp $192, %esi
bhi Lschedule_256
beq Lschedule_192
@ 128: fall though
@@
@@ .schedule_128
@@
@@ 128-bit specific part of key schedule.
@@
@@ This schedule is really simple, because all its parts
@@ are accomplished by the subroutines.
@@
Lschedule_128:
mov r0, #10 @ mov $10, %esi
Loop_schedule_128:
bl _vpaes_schedule_round
subs r0, r0, #1 @ dec %esi
beq Lschedule_mangle_last
bl _vpaes_schedule_mangle @ write output
b Loop_schedule_128
@@
@@ .aes_schedule_192
@@
@@ 192-bit specific part of key schedule.
@@
@@ The main body of this schedule is the same as the 128-bit
@@ schedule, but with more smearing. The long, high side is
@@ stored in q7 as before, and the short, low side is in
@@ the high bits of q6.
@@
@@ This schedule is somewhat nastier, however, because each
@@ round produces 192 bits of key material, or 1.5 round keys.
@@ Therefore, on each cycle we do 2 rounds and produce 3 round
@@ keys.
@@
.align 4
Lschedule_192:
sub r0, r0, #8
vld1.64 {q0}, [r0] @ vmovdqu 8(%rdi),%xmm0 # load key part 2 (very unaligned)
bl _vpaes_schedule_transform @ input transform
vmov q6, q0 @ vmovdqa %xmm0, %xmm6 # save short part
vmov.i8 d12, #0 @ vpxor %xmm4, %xmm4, %xmm4 # clear 4
@ vmovhlps %xmm4, %xmm6, %xmm6 # clobber low side with zeros
mov r0, #4 @ mov $4, %esi
Loop_schedule_192:
bl _vpaes_schedule_round
vext.8 q0, q6, q0, #8 @ vpalignr $8,%xmm6,%xmm0,%xmm0
bl _vpaes_schedule_mangle @ save key n
bl _vpaes_schedule_192_smear
bl _vpaes_schedule_mangle @ save key n+1
bl _vpaes_schedule_round
subs r0, r0, #1 @ dec %esi
beq Lschedule_mangle_last
bl _vpaes_schedule_mangle @ save key n+2
bl _vpaes_schedule_192_smear
b Loop_schedule_192
@@
@@ .aes_schedule_256
@@
@@ 256-bit specific part of key schedule.
@@
@@ The structure here is very similar to the 128-bit
@@ schedule, but with an additional "low side" in
@@ q6. The low side's rounds are the same as the
@@ high side's, except no rcon and no rotation.
@@
.align 4
Lschedule_256:
vld1.64 {q0}, [r0] @ vmovdqu 16(%rdi),%xmm0 # load key part 2 (unaligned)
bl _vpaes_schedule_transform @ input transform
mov r0, #7 @ mov $7, %esi
Loop_schedule_256:
bl _vpaes_schedule_mangle @ output low result
vmov q6, q0 @ vmovdqa %xmm0, %xmm6 # save cur_lo in xmm6
@ high round
bl _vpaes_schedule_round
subs r0, r0, #1 @ dec %esi
beq Lschedule_mangle_last
bl _vpaes_schedule_mangle
@ low round. swap xmm7 and xmm6
vdup.32 q0, d1[1] @ vpshufd $0xFF, %xmm0, %xmm0
vmov.i8 q4, #0
vmov q5, q7 @ vmovdqa %xmm7, %xmm5
vmov q7, q6 @ vmovdqa %xmm6, %xmm7
bl _vpaes_schedule_low_round
vmov q7, q5 @ vmovdqa %xmm5, %xmm7
b Loop_schedule_256
@@
@@ .aes_schedule_mangle_last
@@
@@ Mangler for last round of key schedule
@@ Mangles q0
@@ when encrypting, outputs out(q0) ^ 63
@@ when decrypting, outputs unskew(q0)
@@
@@ Always called right before return... jumps to cleanup and exits
@@
.align 4
Lschedule_mangle_last:
@ schedule last round key from xmm0
adr r11, Lk_deskew @ lea Lk_deskew(%rip),%r11 # prepare to deskew
tst r3, r3
bne Lschedule_mangle_last_dec
@ encrypting
vld1.64 {q1}, [r8] @ vmovdqa (%r8,%r10),%xmm1
adr r11, Lk_opt @ lea Lk_opt(%rip), %r11 # prepare to output transform
add r2, r2, #32 @ add $32, %rdx
vmov q2, q0
vtbl.8 d0, {q2}, d2 @ vpshufb %xmm1, %xmm0, %xmm0 # output permute
vtbl.8 d1, {q2}, d3
Lschedule_mangle_last_dec:
sub r2, r2, #16 @ add $-16, %rdx
veor q0, q0, q12 @ vpxor Lk_s63(%rip), %xmm0, %xmm0
bl _vpaes_schedule_transform @ output transform
vst1.64 {q0}, [r2] @ vmovdqu %xmm0, (%rdx) # save last key
@ cleanup
veor q0, q0, q0 @ vpxor %xmm0, %xmm0, %xmm0
veor q1, q1, q1 @ vpxor %xmm1, %xmm1, %xmm1
veor q2, q2, q2 @ vpxor %xmm2, %xmm2, %xmm2
veor q3, q3, q3 @ vpxor %xmm3, %xmm3, %xmm3
veor q4, q4, q4 @ vpxor %xmm4, %xmm4, %xmm4
veor q5, q5, q5 @ vpxor %xmm5, %xmm5, %xmm5
veor q6, q6, q6 @ vpxor %xmm6, %xmm6, %xmm6
veor q7, q7, q7 @ vpxor %xmm7, %xmm7, %xmm7
ldmia sp!, {r3,pc} @ return
@@
@@ .aes_schedule_192_smear
@@
@@ Smear the short, low side in the 192-bit key schedule.
@@
@@ Inputs:
@@ q7: high side, b a x y
@@ q6: low side, d c 0 0
@@
@@ Outputs:
@@ q6: b+c+d b+c 0 0
@@ q0: b+c+d b+c b a
@@
#ifdef __thumb2__
.thumb_func _vpaes_schedule_192_smear
#endif
.align 4
_vpaes_schedule_192_smear:
vmov.i8 q1, #0
vdup.32 q0, d15[1]
vshl.i64 q1, q6, #32 @ vpshufd $0x80, %xmm6, %xmm1 # d c 0 0 -> c 0 0 0
vmov d0, d15 @ vpshufd $0xFE, %xmm7, %xmm0 # b a _ _ -> b b b a
veor q6, q6, q1 @ vpxor %xmm1, %xmm6, %xmm6 # -> c+d c 0 0
veor q1, q1, q1 @ vpxor %xmm1, %xmm1, %xmm1
veor q6, q6, q0 @ vpxor %xmm0, %xmm6, %xmm6 # -> b+c+d b+c b a
vmov q0, q6 @ vmovdqa %xmm6, %xmm0
vmov d12, d2 @ vmovhlps %xmm1, %xmm6, %xmm6 # clobber low side with zeros
bx lr
@@
@@ .aes_schedule_round
@@
@@ Runs one main round of the key schedule on q0, q7
@@
@@ Specifically, runs subbytes on the high dword of q0
@@ then rotates it by one byte and xors into the low dword of
@@ q7.
@@
@@ Adds rcon from low byte of q8, then rotates q8 for
@@ next rcon.
@@
@@ Smears the dwords of q7 by xoring the low into the
@@ second low, result into third, result into highest.
@@
@@ Returns results in q7 = q0.
@@ Clobbers q1-q4, r11.
@@
#ifdef __thumb2__
.thumb_func _vpaes_schedule_round
#endif
.align 4
_vpaes_schedule_round:
@ extract rcon from xmm8
vmov.i8 q4, #0 @ vpxor %xmm4, %xmm4, %xmm4
vext.8 q1, q8, q4, #15 @ vpalignr $15, %xmm8, %xmm4, %xmm1
vext.8 q8, q8, q8, #15 @ vpalignr $15, %xmm8, %xmm8, %xmm8
veor q7, q7, q1 @ vpxor %xmm1, %xmm7, %xmm7
@ rotate
vdup.32 q0, d1[1] @ vpshufd $0xFF, %xmm0, %xmm0
vext.8 q0, q0, q0, #1 @ vpalignr $1, %xmm0, %xmm0, %xmm0
@ fall through...
@ low round: same as high round, but no rotation and no rcon.
_vpaes_schedule_low_round:
@ The x86_64 version pins .Lk_sb1 in %xmm13 and .Lk_sb1+16 in %xmm12.
@ We pin other values in _vpaes_key_preheat, so load them now.
adr r11, Lk_sb1
vld1.64 {q14,q15}, [r11]
@ smear xmm7
vext.8 q1, q4, q7, #12 @ vpslldq $4, %xmm7, %xmm1
veor q7, q7, q1 @ vpxor %xmm1, %xmm7, %xmm7
vext.8 q4, q4, q7, #8 @ vpslldq $8, %xmm7, %xmm4
@ subbytes
vand q1, q0, q9 @ vpand %xmm9, %xmm0, %xmm1 # 0 = k
vshr.u8 q0, q0, #4 @ vpsrlb $4, %xmm0, %xmm0 # 1 = i
veor q7, q7, q4 @ vpxor %xmm4, %xmm7, %xmm7
vtbl.8 d4, {q11}, d2 @ vpshufb %xmm1, %xmm11, %xmm2 # 2 = a/k
vtbl.8 d5, {q11}, d3
veor q1, q1, q0 @ vpxor %xmm0, %xmm1, %xmm1 # 0 = j
vtbl.8 d6, {q10}, d0 @ vpshufb %xmm0, %xmm10, %xmm3 # 3 = 1/i
vtbl.8 d7, {q10}, d1
veor q3, q3, q2 @ vpxor %xmm2, %xmm3, %xmm3 # 3 = iak = 1/i + a/k
vtbl.8 d8, {q10}, d2 @ vpshufb %xmm1, %xmm10, %xmm4 # 4 = 1/j
vtbl.8 d9, {q10}, d3
veor q7, q7, q12 @ vpxor Lk_s63(%rip), %xmm7, %xmm7
vtbl.8 d6, {q10}, d6 @ vpshufb %xmm3, %xmm10, %xmm3 # 2 = 1/iak
vtbl.8 d7, {q10}, d7
veor q4, q4, q2 @ vpxor %xmm2, %xmm4, %xmm4 # 4 = jak = 1/j + a/k
vtbl.8 d4, {q10}, d8 @ vpshufb %xmm4, %xmm10, %xmm2 # 3 = 1/jak
vtbl.8 d5, {q10}, d9
veor q3, q3, q1 @ vpxor %xmm1, %xmm3, %xmm3 # 2 = io
veor q2, q2, q0 @ vpxor %xmm0, %xmm2, %xmm2 # 3 = jo
vtbl.8 d8, {q15}, d6 @ vpshufb %xmm3, %xmm13, %xmm4 # 4 = sbou
vtbl.8 d9, {q15}, d7
vtbl.8 d2, {q14}, d4 @ vpshufb %xmm2, %xmm12, %xmm1 # 0 = sb1t
vtbl.8 d3, {q14}, d5
veor q1, q1, q4 @ vpxor %xmm4, %xmm1, %xmm1 # 0 = sbox output
@ add in smeared stuff
veor q0, q1, q7 @ vpxor %xmm7, %xmm1, %xmm0
veor q7, q1, q7 @ vmovdqa %xmm0, %xmm7
bx lr
@@
@@ .aes_schedule_transform
@@
@@ Linear-transform q0 according to tables at [r11]
@@
@@ Requires that q9 = 0x0F0F... as in preheat
@@ Output in q0
@@ Clobbers q1, q2, q14, q15
@@
#ifdef __thumb2__
.thumb_func _vpaes_schedule_transform
#endif
.align 4
_vpaes_schedule_transform:
vld1.64 {q14,q15}, [r11] @ vmovdqa (%r11), %xmm2 # lo
@ vmovdqa 16(%r11), %xmm1 # hi
vand q1, q0, q9 @ vpand %xmm9, %xmm0, %xmm1
vshr.u8 q0, q0, #4 @ vpsrlb $4, %xmm0, %xmm0
vtbl.8 d4, {q14}, d2 @ vpshufb %xmm1, %xmm2, %xmm2
vtbl.8 d5, {q14}, d3
vtbl.8 d0, {q15}, d0 @ vpshufb %xmm0, %xmm1, %xmm0
vtbl.8 d1, {q15}, d1
veor q0, q0, q2 @ vpxor %xmm2, %xmm0, %xmm0
bx lr
@@
@@ .aes_schedule_mangle
@@
@@ Mangles q0 from (basis-transformed) standard version
@@ to our version.
@@
@@ On encrypt,
@@ xor with 0x63
@@ multiply by circulant 0,1,1,1
@@ apply shiftrows transform
@@
@@ On decrypt,
@@ xor with 0x63
@@ multiply by "inverse mixcolumns" circulant E,B,D,9
@@ deskew
@@ apply shiftrows transform
@@
@@
@@ Writes out to [r2], and increments or decrements it
@@ Keeps track of round number mod 4 in r8
@@ Preserves q0
@@ Clobbers q1-q5
@@
#ifdef __thumb2__
.thumb_func _vpaes_schedule_mangle
#endif
.align 4
_vpaes_schedule_mangle:
tst r3, r3
vmov q4, q0 @ vmovdqa %xmm0, %xmm4 # save xmm0 for later
adr r11, Lk_mc_forward @ Must be aligned to 8 mod 16.
vld1.64 {q5}, [r11] @ vmovdqa Lk_mc_forward(%rip),%xmm5
bne Lschedule_mangle_dec
@ encrypting
@ Write to q2 so we do not overlap table and destination below.
veor q2, q0, q12 @ vpxor Lk_s63(%rip), %xmm0, %xmm4
add r2, r2, #16 @ add $16, %rdx
vtbl.8 d8, {q2}, d10 @ vpshufb %xmm5, %xmm4, %xmm4
vtbl.8 d9, {q2}, d11
vtbl.8 d2, {q4}, d10 @ vpshufb %xmm5, %xmm4, %xmm1
vtbl.8 d3, {q4}, d11
vtbl.8 d6, {q1}, d10 @ vpshufb %xmm5, %xmm1, %xmm3
vtbl.8 d7, {q1}, d11
veor q4, q4, q1 @ vpxor %xmm1, %xmm4, %xmm4
vld1.64 {q1}, [r8] @ vmovdqa (%r8,%r10), %xmm1
veor q3, q3, q4 @ vpxor %xmm4, %xmm3, %xmm3
b Lschedule_mangle_both
.align 4
Lschedule_mangle_dec:
@ inverse mix columns
adr r11, Lk_dksd @ lea Lk_dksd(%rip),%r11
vshr.u8 q1, q4, #4 @ vpsrlb $4, %xmm4, %xmm1 # 1 = hi
vand q4, q4, q9 @ vpand %xmm9, %xmm4, %xmm4 # 4 = lo
vld1.64 {q14,q15}, [r11]! @ vmovdqa 0x00(%r11), %xmm2
@ vmovdqa 0x10(%r11), %xmm3
vtbl.8 d4, {q14}, d8 @ vpshufb %xmm4, %xmm2, %xmm2
vtbl.8 d5, {q14}, d9
vtbl.8 d6, {q15}, d2 @ vpshufb %xmm1, %xmm3, %xmm3
vtbl.8 d7, {q15}, d3
@ Load .Lk_dksb ahead of time.
vld1.64 {q14,q15}, [r11]! @ vmovdqa 0x20(%r11), %xmm2
@ vmovdqa 0x30(%r11), %xmm3
@ Write to q13 so we do not overlap table and destination.
veor q13, q3, q2 @ vpxor %xmm2, %xmm3, %xmm3
vtbl.8 d6, {q13}, d10 @ vpshufb %xmm5, %xmm3, %xmm3
vtbl.8 d7, {q13}, d11
vtbl.8 d4, {q14}, d8 @ vpshufb %xmm4, %xmm2, %xmm2
vtbl.8 d5, {q14}, d9
veor q2, q2, q3 @ vpxor %xmm3, %xmm2, %xmm2
vtbl.8 d6, {q15}, d2 @ vpshufb %xmm1, %xmm3, %xmm3
vtbl.8 d7, {q15}, d3
@ Load .Lk_dkse ahead of time.
vld1.64 {q14,q15}, [r11]! @ vmovdqa 0x40(%r11), %xmm2
@ vmovdqa 0x50(%r11), %xmm3
@ Write to q13 so we do not overlap table and destination.
veor q13, q3, q2 @ vpxor %xmm2, %xmm3, %xmm3
vtbl.8 d6, {q13}, d10 @ vpshufb %xmm5, %xmm3, %xmm3
vtbl.8 d7, {q13}, d11
vtbl.8 d4, {q14}, d8 @ vpshufb %xmm4, %xmm2, %xmm2
vtbl.8 d5, {q14}, d9
veor q2, q2, q3 @ vpxor %xmm3, %xmm2, %xmm2
vtbl.8 d6, {q15}, d2 @ vpshufb %xmm1, %xmm3, %xmm3
vtbl.8 d7, {q15}, d3
@ Load .Lk_dkse ahead of time.
vld1.64 {q14,q15}, [r11]! @ vmovdqa 0x60(%r11), %xmm2
@ vmovdqa 0x70(%r11), %xmm4
@ Write to q13 so we do not overlap table and destination.
veor q13, q3, q2 @ vpxor %xmm2, %xmm3, %xmm3
vtbl.8 d4, {q14}, d8 @ vpshufb %xmm4, %xmm2, %xmm2
vtbl.8 d5, {q14}, d9
vtbl.8 d6, {q13}, d10 @ vpshufb %xmm5, %xmm3, %xmm3
vtbl.8 d7, {q13}, d11
vtbl.8 d8, {q15}, d2 @ vpshufb %xmm1, %xmm4, %xmm4
vtbl.8 d9, {q15}, d3
vld1.64 {q1}, [r8] @ vmovdqa (%r8,%r10), %xmm1
veor q2, q2, q3 @ vpxor %xmm3, %xmm2, %xmm2
veor q3, q4, q2 @ vpxor %xmm2, %xmm4, %xmm3
sub r2, r2, #16 @ add $-16, %rdx
Lschedule_mangle_both:
@ Write to q2 so table and destination do not overlap.
vtbl.8 d4, {q3}, d2 @ vpshufb %xmm1, %xmm3, %xmm3
vtbl.8 d5, {q3}, d3
add r8, r8, #64-16 @ add $-16, %r8
and r8, r8, #~(1<<6) @ and $0x30, %r8
vst1.64 {q2}, [r2] @ vmovdqu %xmm3, (%rdx)
bx lr
.globl _vpaes_set_encrypt_key
.private_extern _vpaes_set_encrypt_key
#ifdef __thumb2__
.thumb_func _vpaes_set_encrypt_key
#endif
.align 4
_vpaes_set_encrypt_key:
stmdb sp!, {r7,r8,r9,r10,r11, lr}
vstmdb sp!, {d8,d9,d10,d11,d12,d13,d14,d15}
lsr r9, r1, #5 @ shr $5,%eax
add r9, r9, #5 @ $5,%eax
str r9, [r2,#240] @ mov %eax,240(%rdx) # AES_KEY->rounds = nbits/32+5;
mov r3, #0 @ mov $0,%ecx
mov r8, #0x30 @ mov $0x30,%r8d
bl _vpaes_schedule_core
eor r0, r0, r0
vldmia sp!, {d8,d9,d10,d11,d12,d13,d14,d15}
ldmia sp!, {r7,r8,r9,r10,r11, pc} @ return
.globl _vpaes_set_decrypt_key
.private_extern _vpaes_set_decrypt_key
#ifdef __thumb2__
.thumb_func _vpaes_set_decrypt_key
#endif
.align 4
_vpaes_set_decrypt_key:
stmdb sp!, {r7,r8,r9,r10,r11, lr}
vstmdb sp!, {d8,d9,d10,d11,d12,d13,d14,d15}
lsr r9, r1, #5 @ shr $5,%eax
add r9, r9, #5 @ $5,%eax
str r9, [r2,#240] @ mov %eax,240(%rdx) # AES_KEY->rounds = nbits/32+5;
lsl r9, r9, #4 @ shl $4,%eax
add r2, r2, #16 @ lea 16(%rdx,%rax),%rdx
add r2, r2, r9
mov r3, #1 @ mov $1,%ecx
lsr r8, r1, #1 @ shr $1,%r8d
and r8, r8, #32 @ and $32,%r8d
eor r8, r8, #32 @ xor $32,%r8d # nbits==192?0:32
bl _vpaes_schedule_core
vldmia sp!, {d8,d9,d10,d11,d12,d13,d14,d15}
ldmia sp!, {r7,r8,r9,r10,r11, pc} @ return
@ Additional constants for converting to bsaes.
.align 4
_vpaes_convert_consts:
@ .Lk_opt_then_skew applies skew(opt(x)) XOR 0x63, where skew is the linear
@ transform in the AES S-box. 0x63 is incorporated into the low half of the
@ table. This was computed with the following script:
@
@ def u64s_to_u128(x, y):
@ return x | (y << 64)
@ def u128_to_u64s(w):
@ return w & ((1<<64)-1), w >> 64
@ def get_byte(w, i):
@ return (w >> (i*8)) & 0xff
@ def apply_table(table, b):
@ lo = b & 0xf
@ hi = b >> 4
@ return get_byte(table[0], lo) ^ get_byte(table[1], hi)
@ def opt(b):
@ table = [
@ u64s_to_u128(0xFF9F4929D6B66000, 0xF7974121DEBE6808),
@ u64s_to_u128(0x01EDBD5150BCEC00, 0xE10D5DB1B05C0CE0),
@ ]
@ return apply_table(table, b)
@ def rot_byte(b, n):
@ return 0xff & ((b << n) | (b >> (8-n)))
@ def skew(x):
@ return (x ^ rot_byte(x, 1) ^ rot_byte(x, 2) ^ rot_byte(x, 3) ^
@ rot_byte(x, 4))
@ table = [0, 0]
@ for i in range(16):
@ table[0] |= (skew(opt(i)) ^ 0x63) << (i*8)
@ table[1] |= skew(opt(i<<4)) << (i*8)
@ print(" .quad 0x%016x, 0x%016x" % u128_to_u64s(table[0]))
@ print(" .quad 0x%016x, 0x%016x" % u128_to_u64s(table[1]))
Lk_opt_then_skew:
.quad 0x9cb8436798bc4763, 0x6440bb9f6044bf9b
.quad 0x1f30062936192f00, 0xb49bad829db284ab
@ .Lk_decrypt_transform is a permutation which performs an 8-bit left-rotation
@ followed by a byte-swap on each 32-bit word of a vector. E.g., 0x11223344
@ becomes 0x22334411 and then 0x11443322.
Lk_decrypt_transform:
.quad 0x0704050603000102, 0x0f0c0d0e0b08090a
@ void vpaes_encrypt_key_to_bsaes(AES_KEY *bsaes, const AES_KEY *vpaes);
.globl _vpaes_encrypt_key_to_bsaes
.private_extern _vpaes_encrypt_key_to_bsaes
#ifdef __thumb2__
.thumb_func _vpaes_encrypt_key_to_bsaes
#endif
.align 4
_vpaes_encrypt_key_to_bsaes:
stmdb sp!, {r11, lr}
@ See _vpaes_schedule_core for the key schedule logic. In particular,
@ _vpaes_schedule_transform(.Lk_ipt) (section 2.2 of the paper),
@ _vpaes_schedule_mangle (section 4.3), and .Lschedule_mangle_last
@ contain the transformations not in the bsaes representation. This
@ function inverts those transforms.
@
@ Note also that bsaes-armv7.pl expects aes-armv4.pl's key
@ representation, which does not match the other aes_nohw_*
@ implementations. The ARM aes_nohw_* stores each 32-bit word
@ byteswapped, as a convenience for (unsupported) big-endian ARM, at the
@ cost of extra REV and VREV32 operations in little-endian ARM.
vmov.i8 q9, #0x0f @ Required by _vpaes_schedule_transform
adr r2, Lk_mc_forward @ Must be aligned to 8 mod 16.
add r3, r2, 0x90 @ Lk_sr+0x10-Lk_mc_forward = 0x90 (Apple's toolchain doesn't support the expression)
vld1.64 {q12}, [r2]
vmov.i8 q10, #0x5b @ Lk_s63 from vpaes-x86_64
adr r11, Lk_opt @ Must be aligned to 8 mod 16.
vmov.i8 q11, #0x63 @ LK_s63 without Lk_ipt applied
@ vpaes stores one fewer round count than bsaes, but the number of keys
@ is the same.
ldr r2, [r1,#240]
add r2, r2, #1
str r2, [r0,#240]
@ The first key is transformed with _vpaes_schedule_transform(.Lk_ipt).
@ Invert this with .Lk_opt.
vld1.64 {q0}, [r1]!
bl _vpaes_schedule_transform
vrev32.8 q0, q0
vst1.64 {q0}, [r0]!
@ The middle keys have _vpaes_schedule_transform(.Lk_ipt) applied,
@ followed by _vpaes_schedule_mangle. _vpaes_schedule_mangle XORs 0x63,
@ multiplies by the circulant 0,1,1,1, then applies ShiftRows.
Loop_enc_key_to_bsaes:
vld1.64 {q0}, [r1]!
@ Invert the ShiftRows step (see .Lschedule_mangle_both). Note we cycle
@ r3 in the opposite direction and start at .Lk_sr+0x10 instead of 0x30.
@ We use r3 rather than r8 to avoid a callee-saved register.
vld1.64 {q1}, [r3]
vtbl.8 d4, {q0}, d2
vtbl.8 d5, {q0}, d3
add r3, r3, #16
and r3, r3, #~(1<<6)
vmov q0, q2
@ Handle the last key differently.
subs r2, r2, #1
beq Loop_enc_key_to_bsaes_last
@ Multiply by the circulant. This is its own inverse.
vtbl.8 d2, {q0}, d24
vtbl.8 d3, {q0}, d25
vmov q0, q1
vtbl.8 d4, {q1}, d24
vtbl.8 d5, {q1}, d25
veor q0, q0, q2
vtbl.8 d2, {q2}, d24
vtbl.8 d3, {q2}, d25
veor q0, q0, q1
@ XOR and finish.
veor q0, q0, q10
bl _vpaes_schedule_transform
vrev32.8 q0, q0
vst1.64 {q0}, [r0]!
b Loop_enc_key_to_bsaes
Loop_enc_key_to_bsaes_last:
@ The final key does not have a basis transform (note
@ .Lschedule_mangle_last inverts the original transform). It only XORs
@ 0x63 and applies ShiftRows. The latter was already inverted in the
@ loop. Note that, because we act on the original representation, we use
@ q11, not q10.
veor q0, q0, q11
vrev32.8 q0, q0
vst1.64 {q0}, [r0]
@ Wipe registers which contained key material.
veor q0, q0, q0
veor q1, q1, q1
veor q2, q2, q2
ldmia sp!, {r11, pc} @ return
@ void vpaes_decrypt_key_to_bsaes(AES_KEY *vpaes, const AES_KEY *bsaes);
.globl _vpaes_decrypt_key_to_bsaes
.private_extern _vpaes_decrypt_key_to_bsaes
#ifdef __thumb2__
.thumb_func _vpaes_decrypt_key_to_bsaes
#endif
.align 4
_vpaes_decrypt_key_to_bsaes:
stmdb sp!, {r11, lr}
@ See _vpaes_schedule_core for the key schedule logic. Note vpaes
@ computes the decryption key schedule in reverse. Additionally,
@ aes-x86_64.pl shares some transformations, so we must only partially
@ invert vpaes's transformations. In general, vpaes computes in a
@ different basis (.Lk_ipt and .Lk_opt) and applies the inverses of
@ MixColumns, ShiftRows, and the affine part of the AES S-box (which is
@ split into a linear skew and XOR of 0x63). We undo all but MixColumns.
@
@ Note also that bsaes-armv7.pl expects aes-armv4.pl's key
@ representation, which does not match the other aes_nohw_*
@ implementations. The ARM aes_nohw_* stores each 32-bit word
@ byteswapped, as a convenience for (unsupported) big-endian ARM, at the
@ cost of extra REV and VREV32 operations in little-endian ARM.
adr r2, Lk_decrypt_transform
adr r3, Lk_sr+0x30
adr r11, Lk_opt_then_skew @ Input to _vpaes_schedule_transform.
vld1.64 {q12}, [r2] @ Reuse q12 from encryption.
vmov.i8 q9, #0x0f @ Required by _vpaes_schedule_transform
@ vpaes stores one fewer round count than bsaes, but the number of keys
@ is the same.
ldr r2, [r1,#240]
add r2, r2, #1
str r2, [r0,#240]
@ Undo the basis change and reapply the S-box affine transform. See
@ .Lschedule_mangle_last.
vld1.64 {q0}, [r1]!
bl _vpaes_schedule_transform
vrev32.8 q0, q0
vst1.64 {q0}, [r0]!
@ See _vpaes_schedule_mangle for the transform on the middle keys. Note
@ it simultaneously inverts MixColumns and the S-box affine transform.
@ See .Lk_dksd through .Lk_dks9.
Loop_dec_key_to_bsaes:
vld1.64 {q0}, [r1]!
@ Invert the ShiftRows step (see .Lschedule_mangle_both). Note going
@ forwards cancels inverting for which direction we cycle r3. We use r3
@ rather than r8 to avoid a callee-saved register.
vld1.64 {q1}, [r3]
vtbl.8 d4, {q0}, d2
vtbl.8 d5, {q0}, d3
add r3, r3, #64-16
and r3, r3, #~(1<<6)
vmov q0, q2
@ Handle the last key differently.
subs r2, r2, #1
beq Loop_dec_key_to_bsaes_last
@ Undo the basis change and reapply the S-box affine transform.
bl _vpaes_schedule_transform
@ Rotate each word by 8 bytes (cycle the rows) and then byte-swap. We
@ combine the two operations in .Lk_decrypt_transform.
@
@ TODO(davidben): Where does the rotation come from?
vtbl.8 d2, {q0}, d24
vtbl.8 d3, {q0}, d25
vst1.64 {q1}, [r0]!
b Loop_dec_key_to_bsaes
Loop_dec_key_to_bsaes_last:
@ The final key only inverts ShiftRows (already done in the loop). See
@ .Lschedule_am_decrypting. Its basis is not transformed.
vrev32.8 q0, q0
vst1.64 {q0}, [r0]!
@ Wipe registers which contained key material.
veor q0, q0, q0
veor q1, q1, q1
veor q2, q2, q2
ldmia sp!, {r11, pc} @ return
.globl _vpaes_ctr32_encrypt_blocks
.private_extern _vpaes_ctr32_encrypt_blocks
#ifdef __thumb2__
.thumb_func _vpaes_ctr32_encrypt_blocks
#endif
.align 4
_vpaes_ctr32_encrypt_blocks:
mov ip, sp
stmdb sp!, {r7,r8,r9,r10,r11, lr}
@ This function uses q4-q7 (d8-d15), which are callee-saved.
vstmdb sp!, {d8,d9,d10,d11,d12,d13,d14,d15}
cmp r2, #0
@ r8 is passed on the stack.
ldr r8, [ip]
beq Lctr32_done
@ _vpaes_encrypt_core expects the key in r2, so swap r2 and r3.
mov r9, r3
mov r3, r2
mov r2, r9
@ Load the IV and counter portion.
ldr r7, [r8, #12]
vld1.8 {q7}, [r8]
bl _vpaes_preheat
rev r7, r7 @ The counter is big-endian.
Lctr32_loop:
vmov q0, q7
vld1.8 {q6}, [r0]! @ Load input ahead of time
bl _vpaes_encrypt_core
veor q0, q0, q6 @ XOR input and result
vst1.8 {q0}, [r1]!
subs r3, r3, #1
@ Update the counter.
add r7, r7, #1
rev r9, r7
vmov.32 d15[1], r9
bne Lctr32_loop
Lctr32_done:
vldmia sp!, {d8,d9,d10,d11,d12,d13,d14,d15}
ldmia sp!, {r7,r8,r9,r10,r11, pc} @ return
#endif // !OPENSSL_NO_ASM
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