/* 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 */ #include #include .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 add r6, r6, #1 vmov q0, q7 vmov q1, q7 rev ip, r6 add r6, r6, #1 vmov q2, q7 vmov s7, ip rev ip, r6 add r6, r6, #1 vmov q3, q7 vmov s11, ip rev ip, r6 add r6, r6, #1 vmov s15, ip 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