| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * aes-ce-core.S - AES in CBC/CTR/XTS mode using ARMv8 Crypto Extensions |
| * |
| * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| |
| .text |
| .arch armv8-a |
| .fpu crypto-neon-fp-armv8 |
| .align 3 |
| |
| .macro enc_round, state, key |
| aese.8 \state, \key |
| aesmc.8 \state, \state |
| .endm |
| |
| .macro dec_round, state, key |
| aesd.8 \state, \key |
| aesimc.8 \state, \state |
| .endm |
| |
| .macro enc_dround, key1, key2 |
| enc_round q0, \key1 |
| enc_round q0, \key2 |
| .endm |
| |
| .macro dec_dround, key1, key2 |
| dec_round q0, \key1 |
| dec_round q0, \key2 |
| .endm |
| |
| .macro enc_fround, key1, key2, key3 |
| enc_round q0, \key1 |
| aese.8 q0, \key2 |
| veor q0, q0, \key3 |
| .endm |
| |
| .macro dec_fround, key1, key2, key3 |
| dec_round q0, \key1 |
| aesd.8 q0, \key2 |
| veor q0, q0, \key3 |
| .endm |
| |
| .macro enc_dround_4x, key1, key2 |
| enc_round q0, \key1 |
| enc_round q1, \key1 |
| enc_round q2, \key1 |
| enc_round q3, \key1 |
| enc_round q0, \key2 |
| enc_round q1, \key2 |
| enc_round q2, \key2 |
| enc_round q3, \key2 |
| .endm |
| |
| .macro dec_dround_4x, key1, key2 |
| dec_round q0, \key1 |
| dec_round q1, \key1 |
| dec_round q2, \key1 |
| dec_round q3, \key1 |
| dec_round q0, \key2 |
| dec_round q1, \key2 |
| dec_round q2, \key2 |
| dec_round q3, \key2 |
| .endm |
| |
| .macro enc_fround_4x, key1, key2, key3 |
| enc_round q0, \key1 |
| enc_round q1, \key1 |
| enc_round q2, \key1 |
| enc_round q3, \key1 |
| aese.8 q0, \key2 |
| aese.8 q1, \key2 |
| aese.8 q2, \key2 |
| aese.8 q3, \key2 |
| veor q0, q0, \key3 |
| veor q1, q1, \key3 |
| veor q2, q2, \key3 |
| veor q3, q3, \key3 |
| .endm |
| |
| .macro dec_fround_4x, key1, key2, key3 |
| dec_round q0, \key1 |
| dec_round q1, \key1 |
| dec_round q2, \key1 |
| dec_round q3, \key1 |
| aesd.8 q0, \key2 |
| aesd.8 q1, \key2 |
| aesd.8 q2, \key2 |
| aesd.8 q3, \key2 |
| veor q0, q0, \key3 |
| veor q1, q1, \key3 |
| veor q2, q2, \key3 |
| veor q3, q3, \key3 |
| .endm |
| |
| .macro do_block, dround, fround |
| cmp r3, #12 @ which key size? |
| vld1.32 {q10-q11}, [ip]! |
| \dround q8, q9 |
| vld1.32 {q12-q13}, [ip]! |
| \dround q10, q11 |
| vld1.32 {q10-q11}, [ip]! |
| \dround q12, q13 |
| vld1.32 {q12-q13}, [ip]! |
| \dround q10, q11 |
| blo 0f @ AES-128: 10 rounds |
| vld1.32 {q10-q11}, [ip]! |
| \dround q12, q13 |
| beq 1f @ AES-192: 12 rounds |
| vld1.32 {q12-q13}, [ip] |
| \dround q10, q11 |
| 0: \fround q12, q13, q14 |
| bx lr |
| |
| 1: \fround q10, q11, q14 |
| bx lr |
| .endm |
| |
| /* |
| * Internal, non-AAPCS compliant functions that implement the core AES |
| * transforms. These should preserve all registers except q0 - q2 and ip |
| * Arguments: |
| * q0 : first in/output block |
| * q1 : second in/output block (_4x version only) |
| * q2 : third in/output block (_4x version only) |
| * q3 : fourth in/output block (_4x version only) |
| * q8 : first round key |
| * q9 : secound round key |
| * q14 : final round key |
| * r2 : address of round key array |
| * r3 : number of rounds |
| */ |
| .align 6 |
| aes_encrypt: |
| add ip, r2, #32 @ 3rd round key |
| .Laes_encrypt_tweak: |
| do_block enc_dround, enc_fround |
| ENDPROC(aes_encrypt) |
| |
| .align 6 |
| aes_decrypt: |
| add ip, r2, #32 @ 3rd round key |
| do_block dec_dround, dec_fround |
| ENDPROC(aes_decrypt) |
| |
| .align 6 |
| aes_encrypt_4x: |
| add ip, r2, #32 @ 3rd round key |
| do_block enc_dround_4x, enc_fround_4x |
| ENDPROC(aes_encrypt_4x) |
| |
| .align 6 |
| aes_decrypt_4x: |
| add ip, r2, #32 @ 3rd round key |
| do_block dec_dround_4x, dec_fround_4x |
| ENDPROC(aes_decrypt_4x) |
| |
| .macro prepare_key, rk, rounds |
| add ip, \rk, \rounds, lsl #4 |
| vld1.32 {q8-q9}, [\rk] @ load first 2 round keys |
| vld1.32 {q14}, [ip] @ load last round key |
| .endm |
| |
| /* |
| * aes_ecb_encrypt(u8 out[], u8 const in[], u32 const rk[], int rounds, |
| * int blocks) |
| * aes_ecb_decrypt(u8 out[], u8 const in[], u32 const rk[], int rounds, |
| * int blocks) |
| */ |
| ENTRY(ce_aes_ecb_encrypt) |
| push {r4, lr} |
| ldr r4, [sp, #8] |
| prepare_key r2, r3 |
| .Lecbencloop4x: |
| subs r4, r4, #4 |
| bmi .Lecbenc1x |
| vld1.8 {q0-q1}, [r1]! |
| vld1.8 {q2-q3}, [r1]! |
| bl aes_encrypt_4x |
| vst1.8 {q0-q1}, [r0]! |
| vst1.8 {q2-q3}, [r0]! |
| b .Lecbencloop4x |
| .Lecbenc1x: |
| adds r4, r4, #4 |
| beq .Lecbencout |
| .Lecbencloop: |
| vld1.8 {q0}, [r1]! |
| bl aes_encrypt |
| vst1.8 {q0}, [r0]! |
| subs r4, r4, #1 |
| bne .Lecbencloop |
| .Lecbencout: |
| pop {r4, pc} |
| ENDPROC(ce_aes_ecb_encrypt) |
| |
| ENTRY(ce_aes_ecb_decrypt) |
| push {r4, lr} |
| ldr r4, [sp, #8] |
| prepare_key r2, r3 |
| .Lecbdecloop4x: |
| subs r4, r4, #4 |
| bmi .Lecbdec1x |
| vld1.8 {q0-q1}, [r1]! |
| vld1.8 {q2-q3}, [r1]! |
| bl aes_decrypt_4x |
| vst1.8 {q0-q1}, [r0]! |
| vst1.8 {q2-q3}, [r0]! |
| b .Lecbdecloop4x |
| .Lecbdec1x: |
| adds r4, r4, #4 |
| beq .Lecbdecout |
| .Lecbdecloop: |
| vld1.8 {q0}, [r1]! |
| bl aes_decrypt |
| vst1.8 {q0}, [r0]! |
| subs r4, r4, #1 |
| bne .Lecbdecloop |
| .Lecbdecout: |
| pop {r4, pc} |
| ENDPROC(ce_aes_ecb_decrypt) |
| |
| /* |
| * aes_cbc_encrypt(u8 out[], u8 const in[], u32 const rk[], int rounds, |
| * int blocks, u8 iv[]) |
| * aes_cbc_decrypt(u8 out[], u8 const in[], u32 const rk[], int rounds, |
| * int blocks, u8 iv[]) |
| */ |
| ENTRY(ce_aes_cbc_encrypt) |
| push {r4-r6, lr} |
| ldrd r4, r5, [sp, #16] |
| vld1.8 {q0}, [r5] |
| prepare_key r2, r3 |
| .Lcbcencloop: |
| vld1.8 {q1}, [r1]! @ get next pt block |
| veor q0, q0, q1 @ ..and xor with iv |
| bl aes_encrypt |
| vst1.8 {q0}, [r0]! |
| subs r4, r4, #1 |
| bne .Lcbcencloop |
| vst1.8 {q0}, [r5] |
| pop {r4-r6, pc} |
| ENDPROC(ce_aes_cbc_encrypt) |
| |
| ENTRY(ce_aes_cbc_decrypt) |
| push {r4-r6, lr} |
| ldrd r4, r5, [sp, #16] |
| vld1.8 {q15}, [r5] @ keep iv in q15 |
| prepare_key r2, r3 |
| .Lcbcdecloop4x: |
| subs r4, r4, #4 |
| bmi .Lcbcdec1x |
| vld1.8 {q0-q1}, [r1]! |
| vld1.8 {q2-q3}, [r1]! |
| vmov q4, q0 |
| vmov q5, q1 |
| vmov q6, q2 |
| vmov q7, q3 |
| bl aes_decrypt_4x |
| veor q0, q0, q15 |
| veor q1, q1, q4 |
| veor q2, q2, q5 |
| veor q3, q3, q6 |
| vmov q15, q7 |
| vst1.8 {q0-q1}, [r0]! |
| vst1.8 {q2-q3}, [r0]! |
| b .Lcbcdecloop4x |
| .Lcbcdec1x: |
| adds r4, r4, #4 |
| beq .Lcbcdecout |
| vmov q6, q14 @ preserve last round key |
| .Lcbcdecloop: |
| vld1.8 {q0}, [r1]! @ get next ct block |
| veor q14, q15, q6 @ combine prev ct with last key |
| vmov q15, q0 |
| bl aes_decrypt |
| vst1.8 {q0}, [r0]! |
| subs r4, r4, #1 |
| bne .Lcbcdecloop |
| .Lcbcdecout: |
| vst1.8 {q15}, [r5] @ keep iv in q15 |
| pop {r4-r6, pc} |
| ENDPROC(ce_aes_cbc_decrypt) |
| |
| |
| /* |
| * ce_aes_cbc_cts_encrypt(u8 out[], u8 const in[], u32 const rk[], |
| * int rounds, int bytes, u8 const iv[]) |
| * ce_aes_cbc_cts_decrypt(u8 out[], u8 const in[], u32 const rk[], |
| * int rounds, int bytes, u8 const iv[]) |
| */ |
| |
| ENTRY(ce_aes_cbc_cts_encrypt) |
| push {r4-r6, lr} |
| ldrd r4, r5, [sp, #16] |
| |
| movw ip, :lower16:.Lcts_permute_table |
| movt ip, :upper16:.Lcts_permute_table |
| sub r4, r4, #16 |
| add lr, ip, #32 |
| add ip, ip, r4 |
| sub lr, lr, r4 |
| vld1.8 {q5}, [ip] |
| vld1.8 {q6}, [lr] |
| |
| add ip, r1, r4 |
| vld1.8 {q0}, [r1] @ overlapping loads |
| vld1.8 {q3}, [ip] |
| |
| vld1.8 {q1}, [r5] @ get iv |
| prepare_key r2, r3 |
| |
| veor q0, q0, q1 @ xor with iv |
| bl aes_encrypt |
| |
| vtbl.8 d4, {d0-d1}, d10 |
| vtbl.8 d5, {d0-d1}, d11 |
| vtbl.8 d2, {d6-d7}, d12 |
| vtbl.8 d3, {d6-d7}, d13 |
| |
| veor q0, q0, q1 |
| bl aes_encrypt |
| |
| add r4, r0, r4 |
| vst1.8 {q2}, [r4] @ overlapping stores |
| vst1.8 {q0}, [r0] |
| |
| pop {r4-r6, pc} |
| ENDPROC(ce_aes_cbc_cts_encrypt) |
| |
| ENTRY(ce_aes_cbc_cts_decrypt) |
| push {r4-r6, lr} |
| ldrd r4, r5, [sp, #16] |
| |
| movw ip, :lower16:.Lcts_permute_table |
| movt ip, :upper16:.Lcts_permute_table |
| sub r4, r4, #16 |
| add lr, ip, #32 |
| add ip, ip, r4 |
| sub lr, lr, r4 |
| vld1.8 {q5}, [ip] |
| vld1.8 {q6}, [lr] |
| |
| add ip, r1, r4 |
| vld1.8 {q0}, [r1] @ overlapping loads |
| vld1.8 {q1}, [ip] |
| |
| vld1.8 {q3}, [r5] @ get iv |
| prepare_key r2, r3 |
| |
| bl aes_decrypt |
| |
| vtbl.8 d4, {d0-d1}, d10 |
| vtbl.8 d5, {d0-d1}, d11 |
| vtbx.8 d0, {d2-d3}, d12 |
| vtbx.8 d1, {d2-d3}, d13 |
| |
| veor q1, q1, q2 |
| bl aes_decrypt |
| veor q0, q0, q3 @ xor with iv |
| |
| add r4, r0, r4 |
| vst1.8 {q1}, [r4] @ overlapping stores |
| vst1.8 {q0}, [r0] |
| |
| pop {r4-r6, pc} |
| ENDPROC(ce_aes_cbc_cts_decrypt) |
| |
| |
| /* |
| * aes_ctr_encrypt(u8 out[], u8 const in[], u32 const rk[], int rounds, |
| * int blocks, u8 ctr[]) |
| */ |
| ENTRY(ce_aes_ctr_encrypt) |
| push {r4-r6, lr} |
| ldrd r4, r5, [sp, #16] |
| vld1.8 {q7}, [r5] @ load ctr |
| prepare_key r2, r3 |
| vmov r6, s31 @ keep swabbed ctr in r6 |
| rev r6, r6 |
| cmn r6, r4 @ 32 bit overflow? |
| bcs .Lctrloop |
| .Lctrloop4x: |
| subs r4, r4, #4 |
| bmi .Lctr1x |
| |
| /* |
| * NOTE: the sequence below has been carefully tweaked to avoid |
| * a silicon erratum that exists in Cortex-A57 (#1742098) and |
| * Cortex-A72 (#1655431) cores, where AESE/AESMC instruction pairs |
| * may produce an incorrect result if they take their input from a |
| * register of which a single 32-bit lane has been updated the last |
| * time it was modified. To work around this, the lanes of registers |
| * q0-q3 below are not manipulated individually, and the different |
| * counter values are prepared by successive manipulations of q7. |
| */ |
| add ip, r6, #1 |
| vmov q0, q7 |
| rev ip, ip |
| add lr, r6, #2 |
| vmov s31, ip @ set lane 3 of q1 via q7 |
| add ip, r6, #3 |
| rev lr, lr |
| vmov q1, q7 |
| vmov s31, lr @ set lane 3 of q2 via q7 |
| rev ip, ip |
| vmov q2, q7 |
| vmov s31, ip @ set lane 3 of q3 via q7 |
| add r6, r6, #4 |
| vmov q3, q7 |
| |
| vld1.8 {q4-q5}, [r1]! |
| vld1.8 {q6}, [r1]! |
| vld1.8 {q15}, [r1]! |
| bl aes_encrypt_4x |
| veor q0, q0, q4 |
| veor q1, q1, q5 |
| veor q2, q2, q6 |
| veor q3, q3, q15 |
| rev ip, r6 |
| vst1.8 {q0-q1}, [r0]! |
| vst1.8 {q2-q3}, [r0]! |
| vmov s31, ip |
| b .Lctrloop4x |
| .Lctr1x: |
| adds r4, r4, #4 |
| beq .Lctrout |
| .Lctrloop: |
| vmov q0, q7 |
| bl aes_encrypt |
| |
| adds r6, r6, #1 @ increment BE ctr |
| rev ip, r6 |
| vmov s31, ip |
| bcs .Lctrcarry |
| |
| .Lctrcarrydone: |
| subs r4, r4, #1 |
| bmi .Lctrtailblock @ blocks < 0 means tail block |
| vld1.8 {q3}, [r1]! |
| veor q3, q0, q3 |
| vst1.8 {q3}, [r0]! |
| bne .Lctrloop |
| |
| .Lctrout: |
| vst1.8 {q7}, [r5] @ return next CTR value |
| pop {r4-r6, pc} |
| |
| .Lctrtailblock: |
| vst1.8 {q0}, [r0, :64] @ return the key stream |
| b .Lctrout |
| |
| .Lctrcarry: |
| .irp sreg, s30, s29, s28 |
| vmov ip, \sreg @ load next word of ctr |
| rev ip, ip @ ... to handle the carry |
| adds ip, ip, #1 |
| rev ip, ip |
| vmov \sreg, ip |
| bcc .Lctrcarrydone |
| .endr |
| b .Lctrcarrydone |
| ENDPROC(ce_aes_ctr_encrypt) |
| |
| /* |
| * aes_xts_encrypt(u8 out[], u8 const in[], u32 const rk1[], int rounds, |
| * int bytes, u8 iv[], u32 const rk2[], int first) |
| * aes_xts_decrypt(u8 out[], u8 const in[], u32 const rk1[], int rounds, |
| * int bytes, u8 iv[], u32 const rk2[], int first) |
| */ |
| |
| .macro next_tweak, out, in, const, tmp |
| vshr.s64 \tmp, \in, #63 |
| vand \tmp, \tmp, \const |
| vadd.u64 \out, \in, \in |
| vext.8 \tmp, \tmp, \tmp, #8 |
| veor \out, \out, \tmp |
| .endm |
| |
| ce_aes_xts_init: |
| vmov.i32 d30, #0x87 @ compose tweak mask vector |
| vmovl.u32 q15, d30 |
| vshr.u64 d30, d31, #7 |
| |
| ldrd r4, r5, [sp, #16] @ load args |
| ldr r6, [sp, #28] |
| vld1.8 {q0}, [r5] @ load iv |
| teq r6, #1 @ start of a block? |
| bxne lr |
| |
| @ Encrypt the IV in q0 with the second AES key. This should only |
| @ be done at the start of a block. |
| ldr r6, [sp, #24] @ load AES key 2 |
| prepare_key r6, r3 |
| add ip, r6, #32 @ 3rd round key of key 2 |
| b .Laes_encrypt_tweak @ tail call |
| ENDPROC(ce_aes_xts_init) |
| |
| ENTRY(ce_aes_xts_encrypt) |
| push {r4-r6, lr} |
| |
| bl ce_aes_xts_init @ run shared prologue |
| prepare_key r2, r3 |
| vmov q4, q0 |
| |
| teq r6, #0 @ start of a block? |
| bne .Lxtsenc4x |
| |
| .Lxtsencloop4x: |
| next_tweak q4, q4, q15, q10 |
| .Lxtsenc4x: |
| subs r4, r4, #64 |
| bmi .Lxtsenc1x |
| vld1.8 {q0-q1}, [r1]! @ get 4 pt blocks |
| vld1.8 {q2-q3}, [r1]! |
| next_tweak q5, q4, q15, q10 |
| veor q0, q0, q4 |
| next_tweak q6, q5, q15, q10 |
| veor q1, q1, q5 |
| next_tweak q7, q6, q15, q10 |
| veor q2, q2, q6 |
| veor q3, q3, q7 |
| bl aes_encrypt_4x |
| veor q0, q0, q4 |
| veor q1, q1, q5 |
| veor q2, q2, q6 |
| veor q3, q3, q7 |
| vst1.8 {q0-q1}, [r0]! @ write 4 ct blocks |
| vst1.8 {q2-q3}, [r0]! |
| vmov q4, q7 |
| teq r4, #0 |
| beq .Lxtsencret |
| b .Lxtsencloop4x |
| .Lxtsenc1x: |
| adds r4, r4, #64 |
| beq .Lxtsencout |
| subs r4, r4, #16 |
| bmi .LxtsencctsNx |
| .Lxtsencloop: |
| vld1.8 {q0}, [r1]! |
| .Lxtsencctsout: |
| veor q0, q0, q4 |
| bl aes_encrypt |
| veor q0, q0, q4 |
| teq r4, #0 |
| beq .Lxtsencout |
| subs r4, r4, #16 |
| next_tweak q4, q4, q15, q6 |
| bmi .Lxtsenccts |
| vst1.8 {q0}, [r0]! |
| b .Lxtsencloop |
| .Lxtsencout: |
| vst1.8 {q0}, [r0] |
| .Lxtsencret: |
| vst1.8 {q4}, [r5] |
| pop {r4-r6, pc} |
| |
| .LxtsencctsNx: |
| vmov q0, q3 |
| sub r0, r0, #16 |
| .Lxtsenccts: |
| movw ip, :lower16:.Lcts_permute_table |
| movt ip, :upper16:.Lcts_permute_table |
| |
| add r1, r1, r4 @ rewind input pointer |
| add r4, r4, #16 @ # bytes in final block |
| add lr, ip, #32 |
| add ip, ip, r4 |
| sub lr, lr, r4 |
| add r4, r0, r4 @ output address of final block |
| |
| vld1.8 {q1}, [r1] @ load final partial block |
| vld1.8 {q2}, [ip] |
| vld1.8 {q3}, [lr] |
| |
| vtbl.8 d4, {d0-d1}, d4 |
| vtbl.8 d5, {d0-d1}, d5 |
| vtbx.8 d0, {d2-d3}, d6 |
| vtbx.8 d1, {d2-d3}, d7 |
| |
| vst1.8 {q2}, [r4] @ overlapping stores |
| mov r4, #0 |
| b .Lxtsencctsout |
| ENDPROC(ce_aes_xts_encrypt) |
| |
| |
| ENTRY(ce_aes_xts_decrypt) |
| push {r4-r6, lr} |
| |
| bl ce_aes_xts_init @ run shared prologue |
| prepare_key r2, r3 |
| vmov q4, q0 |
| |
| /* subtract 16 bytes if we are doing CTS */ |
| tst r4, #0xf |
| subne r4, r4, #0x10 |
| |
| teq r6, #0 @ start of a block? |
| bne .Lxtsdec4x |
| |
| .Lxtsdecloop4x: |
| next_tweak q4, q4, q15, q10 |
| .Lxtsdec4x: |
| subs r4, r4, #64 |
| bmi .Lxtsdec1x |
| vld1.8 {q0-q1}, [r1]! @ get 4 ct blocks |
| vld1.8 {q2-q3}, [r1]! |
| next_tweak q5, q4, q15, q10 |
| veor q0, q0, q4 |
| next_tweak q6, q5, q15, q10 |
| veor q1, q1, q5 |
| next_tweak q7, q6, q15, q10 |
| veor q2, q2, q6 |
| veor q3, q3, q7 |
| bl aes_decrypt_4x |
| veor q0, q0, q4 |
| veor q1, q1, q5 |
| veor q2, q2, q6 |
| veor q3, q3, q7 |
| vst1.8 {q0-q1}, [r0]! @ write 4 pt blocks |
| vst1.8 {q2-q3}, [r0]! |
| vmov q4, q7 |
| teq r4, #0 |
| beq .Lxtsdecout |
| b .Lxtsdecloop4x |
| .Lxtsdec1x: |
| adds r4, r4, #64 |
| beq .Lxtsdecout |
| subs r4, r4, #16 |
| .Lxtsdecloop: |
| vld1.8 {q0}, [r1]! |
| bmi .Lxtsdeccts |
| .Lxtsdecctsout: |
| veor q0, q0, q4 |
| bl aes_decrypt |
| veor q0, q0, q4 |
| vst1.8 {q0}, [r0]! |
| teq r4, #0 |
| beq .Lxtsdecout |
| subs r4, r4, #16 |
| next_tweak q4, q4, q15, q6 |
| b .Lxtsdecloop |
| .Lxtsdecout: |
| vst1.8 {q4}, [r5] |
| pop {r4-r6, pc} |
| |
| .Lxtsdeccts: |
| movw ip, :lower16:.Lcts_permute_table |
| movt ip, :upper16:.Lcts_permute_table |
| |
| add r1, r1, r4 @ rewind input pointer |
| add r4, r4, #16 @ # bytes in final block |
| add lr, ip, #32 |
| add ip, ip, r4 |
| sub lr, lr, r4 |
| add r4, r0, r4 @ output address of final block |
| |
| next_tweak q5, q4, q15, q6 |
| |
| vld1.8 {q1}, [r1] @ load final partial block |
| vld1.8 {q2}, [ip] |
| vld1.8 {q3}, [lr] |
| |
| veor q0, q0, q5 |
| bl aes_decrypt |
| veor q0, q0, q5 |
| |
| vtbl.8 d4, {d0-d1}, d4 |
| vtbl.8 d5, {d0-d1}, d5 |
| vtbx.8 d0, {d2-d3}, d6 |
| vtbx.8 d1, {d2-d3}, d7 |
| |
| vst1.8 {q2}, [r4] @ overlapping stores |
| mov r4, #0 |
| b .Lxtsdecctsout |
| ENDPROC(ce_aes_xts_decrypt) |
| |
| /* |
| * u32 ce_aes_sub(u32 input) - use the aese instruction to perform the |
| * AES sbox substitution on each byte in |
| * 'input' |
| */ |
| ENTRY(ce_aes_sub) |
| vdup.32 q1, r0 |
| veor q0, q0, q0 |
| aese.8 q0, q1 |
| vmov r0, s0 |
| bx lr |
| ENDPROC(ce_aes_sub) |
| |
| /* |
| * void ce_aes_invert(u8 *dst, u8 *src) - perform the Inverse MixColumns |
| * operation on round key *src |
| */ |
| ENTRY(ce_aes_invert) |
| vld1.32 {q0}, [r1] |
| aesimc.8 q0, q0 |
| vst1.32 {q0}, [r0] |
| bx lr |
| ENDPROC(ce_aes_invert) |
| |
| .section ".rodata", "a" |
| .align 6 |
| .Lcts_permute_table: |
| .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
| .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
| .byte 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 |
| .byte 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf |
| .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
| .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
