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| /*
| * aes-ce-core.S - AES in CBC/CTR/XTS mode using ARMv8 Crypto Extensions
| *
| * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
| *
| * This program is free software; you can redistribute it and/or modify
| * it under the terms of the GNU General Public License version 2 as
| * published by the Free Software Foundation.
| */
|
| #include <linux/linkage.h>
| #include <asm/assembler.h>
|
| .text
| .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_3x, key1, key2
| enc_round q0, \key1
| enc_round q1, \key1
| enc_round q2, \key1
| enc_round q0, \key2
| enc_round q1, \key2
| enc_round q2, \key2
| .endm
|
| .macro dec_dround_3x, key1, key2
| dec_round q0, \key1
| dec_round q1, \key1
| dec_round q2, \key1
| dec_round q0, \key2
| dec_round q1, \key2
| dec_round q2, \key2
| .endm
|
| .macro enc_fround_3x, key1, key2, key3
| enc_round q0, \key1
| enc_round q1, \key1
| enc_round q2, \key1
| aese.8 q0, \key2
| aese.8 q1, \key2
| aese.8 q2, \key2
| veor q0, q0, \key3
| veor q1, q1, \key3
| veor q2, q2, \key3
| .endm
|
| .macro dec_fround_3x, key1, key2, key3
| dec_round q0, \key1
| dec_round q1, \key1
| dec_round q2, \key1
| aesd.8 q0, \key2
| aesd.8 q1, \key2
| aesd.8 q2, \key2
| veor q0, q0, \key3
| veor q1, q1, \key3
| veor q2, q2, \key3
| .endm
|
| .macro do_block, dround, fround
| cmp r3, #12 @ which key size?
| vld1.8 {q10-q11}, [ip]!
| \dround q8, q9
| vld1.8 {q12-q13}, [ip]!
| \dround q10, q11
| vld1.8 {q10-q11}, [ip]!
| \dround q12, q13
| vld1.8 {q12-q13}, [ip]!
| \dround q10, q11
| blo 0f @ AES-128: 10 rounds
| vld1.8 {q10-q11}, [ip]!
| \dround q12, q13
| beq 1f @ AES-192: 12 rounds
| vld1.8 {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 (_3x version only)
| * q2 : third in/output block (_3x 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_3x:
| add ip, r2, #32 @ 3rd round key
| do_block enc_dround_3x, enc_fround_3x
| ENDPROC(aes_encrypt_3x)
|
| .align 6
| aes_decrypt_3x:
| add ip, r2, #32 @ 3rd round key
| do_block dec_dround_3x, dec_fround_3x
| ENDPROC(aes_decrypt_3x)
|
| .macro prepare_key, rk, rounds
| add ip, \rk, \rounds, lsl #4
| vld1.8 {q8-q9}, [\rk] @ load first 2 round keys
| vld1.8 {q14}, [ip] @ load last round key
| .endm
|
| /*
| * aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
| * int blocks)
| * aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
| * int blocks)
| */
| ENTRY(ce_aes_ecb_encrypt)
| push {r4, lr}
| ldr r4, [sp, #8]
| prepare_key r2, r3
| .Lecbencloop3x:
| subs r4, r4, #3
| bmi .Lecbenc1x
| vld1.8 {q0-q1}, [r1]!
| vld1.8 {q2}, [r1]!
| bl aes_encrypt_3x
| vst1.8 {q0-q1}, [r0]!
| vst1.8 {q2}, [r0]!
| b .Lecbencloop3x
| .Lecbenc1x:
| adds r4, r4, #3
| 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
| .Lecbdecloop3x:
| subs r4, r4, #3
| bmi .Lecbdec1x
| vld1.8 {q0-q1}, [r1]!
| vld1.8 {q2}, [r1]!
| bl aes_decrypt_3x
| vst1.8 {q0-q1}, [r0]!
| vst1.8 {q2}, [r0]!
| b .Lecbdecloop3x
| .Lecbdec1x:
| adds r4, r4, #3
| 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[], u8 const rk[], int rounds,
| * int blocks, u8 iv[])
| * aes_cbc_decrypt(u8 out[], u8 const in[], u8 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 {q6}, [r5] @ keep iv in q6
| prepare_key r2, r3
| .Lcbcdecloop3x:
| subs r4, r4, #3
| bmi .Lcbcdec1x
| vld1.8 {q0-q1}, [r1]!
| vld1.8 {q2}, [r1]!
| vmov q3, q0
| vmov q4, q1
| vmov q5, q2
| bl aes_decrypt_3x
| veor q0, q0, q6
| veor q1, q1, q3
| veor q2, q2, q4
| vmov q6, q5
| vst1.8 {q0-q1}, [r0]!
| vst1.8 {q2}, [r0]!
| b .Lcbcdecloop3x
| .Lcbcdec1x:
| adds r4, r4, #3
| beq .Lcbcdecout
| vmov q15, 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 q6, q0
| bl aes_decrypt
| vst1.8 {q0}, [r0]!
| subs r4, r4, #1
| bne .Lcbcdecloop
| .Lcbcdecout:
| vst1.8 {q6}, [r5] @ keep iv in q6
| pop {r4-r6, pc}
| ENDPROC(ce_aes_cbc_decrypt)
|
| /*
| * aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
| * int blocks, u8 ctr[])
| */
| ENTRY(ce_aes_ctr_encrypt)
| push {r4-r6, lr}
| ldrd r4, r5, [sp, #16]
| vld1.8 {q6}, [r5] @ load ctr
| prepare_key r2, r3
| vmov r6, s27 @ keep swabbed ctr in r6
| rev r6, r6
| cmn r6, r4 @ 32 bit overflow?
| bcs .Lctrloop
| .Lctrloop3x:
| subs r4, r4, #3
| bmi .Lctr1x
| add r6, r6, #1
| vmov q0, q6
| vmov q1, q6
| rev ip, r6
| add r6, r6, #1
| vmov q2, q6
| vmov s7, ip
| rev ip, r6
| add r6, r6, #1
| vmov s11, ip
| vld1.8 {q3-q4}, [r1]!
| vld1.8 {q5}, [r1]!
| bl aes_encrypt_3x
| veor q0, q0, q3
| veor q1, q1, q4
| veor q2, q2, q5
| rev ip, r6
| vst1.8 {q0-q1}, [r0]!
| vst1.8 {q2}, [r0]!
| vmov s27, ip
| b .Lctrloop3x
| .Lctr1x:
| adds r4, r4, #3
| beq .Lctrout
| .Lctrloop:
| vmov q0, q6
| bl aes_encrypt
| subs r4, r4, #1
| bmi .Lctrtailblock @ blocks < 0 means tail block
| vld1.8 {q3}, [r1]!
| veor q3, q0, q3
| vst1.8 {q3}, [r0]!
|
| adds r6, r6, #1 @ increment BE ctr
| rev ip, r6
| vmov s27, ip
| bcs .Lctrcarry
| teq r4, #0
| bne .Lctrloop
| .Lctrout:
| vst1.8 {q6}, [r5]
| pop {r4-r6, pc}
|
| .Lctrtailblock:
| vst1.8 {q0}, [r0, :64] @ return just the key stream
| pop {r4-r6, pc}
|
| .Lctrcarry:
| .irp sreg, s26, s25, s24
| 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 0f
| .endr
| 0: teq r4, #0
| beq .Lctrout
| b .Lctrloop
| ENDPROC(ce_aes_ctr_encrypt)
|
| /*
| * aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
| * int blocks, u8 iv[], u8 const rk2[], int first)
| * aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
| * int blocks, u8 iv[], u8 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
|
| .align 3
| .Lxts_mul_x:
| .quad 1, 0x87
|
| ce_aes_xts_init:
| vldr d14, .Lxts_mul_x
| vldr d15, .Lxts_mul_x + 8
|
| 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 q3, q0
|
| teq r6, #0 @ start of a block?
| bne .Lxtsenc3x
|
| .Lxtsencloop3x:
| next_tweak q3, q3, q7, q6
| .Lxtsenc3x:
| subs r4, r4, #3
| bmi .Lxtsenc1x
| vld1.8 {q0-q1}, [r1]! @ get 3 pt blocks
| vld1.8 {q2}, [r1]!
| next_tweak q4, q3, q7, q6
| veor q0, q0, q3
| next_tweak q5, q4, q7, q6
| veor q1, q1, q4
| veor q2, q2, q5
| bl aes_encrypt_3x
| veor q0, q0, q3
| veor q1, q1, q4
| veor q2, q2, q5
| vst1.8 {q0-q1}, [r0]! @ write 3 ct blocks
| vst1.8 {q2}, [r0]!
| vmov q3, q5
| teq r4, #0
| beq .Lxtsencout
| b .Lxtsencloop3x
| .Lxtsenc1x:
| adds r4, r4, #3
| beq .Lxtsencout
| .Lxtsencloop:
| vld1.8 {q0}, [r1]!
| veor q0, q0, q3
| bl aes_encrypt
| veor q0, q0, q3
| vst1.8 {q0}, [r0]!
| subs r4, r4, #1
| beq .Lxtsencout
| next_tweak q3, q3, q7, q6
| b .Lxtsencloop
| .Lxtsencout:
| vst1.8 {q3}, [r5]
| pop {r4-r6, pc}
| 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 q3, q0
|
| teq r6, #0 @ start of a block?
| bne .Lxtsdec3x
|
| .Lxtsdecloop3x:
| next_tweak q3, q3, q7, q6
| .Lxtsdec3x:
| subs r4, r4, #3
| bmi .Lxtsdec1x
| vld1.8 {q0-q1}, [r1]! @ get 3 ct blocks
| vld1.8 {q2}, [r1]!
| next_tweak q4, q3, q7, q6
| veor q0, q0, q3
| next_tweak q5, q4, q7, q6
| veor q1, q1, q4
| veor q2, q2, q5
| bl aes_decrypt_3x
| veor q0, q0, q3
| veor q1, q1, q4
| veor q2, q2, q5
| vst1.8 {q0-q1}, [r0]! @ write 3 pt blocks
| vst1.8 {q2}, [r0]!
| vmov q3, q5
| teq r4, #0
| beq .Lxtsdecout
| b .Lxtsdecloop3x
| .Lxtsdec1x:
| adds r4, r4, #3
| beq .Lxtsdecout
| .Lxtsdecloop:
| vld1.8 {q0}, [r1]!
| veor q0, q0, q3
| add ip, r2, #32 @ 3rd round key
| bl aes_decrypt
| veor q0, q0, q3
| vst1.8 {q0}, [r0]!
| subs r4, r4, #1
| beq .Lxtsdecout
| next_tweak q3, q3, q7, q6
| b .Lxtsdecloop
| .Lxtsdecout:
| vst1.8 {q3}, [r5]
| pop {r4-r6, pc}
| 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)
| vld1.8 {q0}, [r1]
| aesimc.8 q0, q0
| vst1.8 {q0}, [r0]
| bx lr
| ENDPROC(ce_aes_invert)
|
|
