516 lines
11 KiB
ArmAsm
516 lines
11 KiB
ArmAsm
/*
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* aes-ce-core.S - AES in CBC/CTR/XTS mode using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.text
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.fpu crypto-neon-fp-armv8
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.align 3
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.macro enc_round, state, key
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aese.8 \state, \key
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aesmc.8 \state, \state
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.endm
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.macro dec_round, state, key
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aesd.8 \state, \key
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aesimc.8 \state, \state
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.endm
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.macro enc_dround, key1, key2
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enc_round q0, \key1
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enc_round q0, \key2
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.endm
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.macro dec_dround, key1, key2
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dec_round q0, \key1
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dec_round q0, \key2
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.endm
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.macro enc_fround, key1, key2, key3
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enc_round q0, \key1
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aese.8 q0, \key2
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veor q0, q0, \key3
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.endm
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.macro dec_fround, key1, key2, key3
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dec_round q0, \key1
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aesd.8 q0, \key2
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veor q0, q0, \key3
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.endm
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.macro enc_dround_3x, key1, key2
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enc_round q0, \key1
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enc_round q1, \key1
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enc_round q2, \key1
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enc_round q0, \key2
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enc_round q1, \key2
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enc_round q2, \key2
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.endm
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.macro dec_dround_3x, key1, key2
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dec_round q0, \key1
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dec_round q1, \key1
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dec_round q2, \key1
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dec_round q0, \key2
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dec_round q1, \key2
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dec_round q2, \key2
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.endm
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.macro enc_fround_3x, key1, key2, key3
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enc_round q0, \key1
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enc_round q1, \key1
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enc_round q2, \key1
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aese.8 q0, \key2
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aese.8 q1, \key2
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aese.8 q2, \key2
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veor q0, q0, \key3
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veor q1, q1, \key3
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veor q2, q2, \key3
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.endm
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.macro dec_fround_3x, key1, key2, key3
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dec_round q0, \key1
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dec_round q1, \key1
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dec_round q2, \key1
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aesd.8 q0, \key2
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aesd.8 q1, \key2
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aesd.8 q2, \key2
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veor q0, q0, \key3
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veor q1, q1, \key3
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veor q2, q2, \key3
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.endm
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.macro do_block, dround, fround
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cmp r3, #12 @ which key size?
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vld1.8 {q10-q11}, [ip]!
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\dround q8, q9
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vld1.8 {q12-q13}, [ip]!
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\dround q10, q11
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vld1.8 {q10-q11}, [ip]!
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\dround q12, q13
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vld1.8 {q12-q13}, [ip]!
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\dround q10, q11
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blo 0f @ AES-128: 10 rounds
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vld1.8 {q10-q11}, [ip]!
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\dround q12, q13
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beq 1f @ AES-192: 12 rounds
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vld1.8 {q12-q13}, [ip]
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\dround q10, q11
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0: \fround q12, q13, q14
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bx lr
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1: \fround q10, q11, q14
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bx lr
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.endm
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/*
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* Internal, non-AAPCS compliant functions that implement the core AES
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* transforms. These should preserve all registers except q0 - q2 and ip
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* Arguments:
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* q0 : first in/output block
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* q1 : second in/output block (_3x version only)
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* q2 : third in/output block (_3x version only)
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* q8 : first round key
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* q9 : secound round key
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* q14 : final round key
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* r2 : address of round key array
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* r3 : number of rounds
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*/
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.align 6
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aes_encrypt:
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add ip, r2, #32 @ 3rd round key
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.Laes_encrypt_tweak:
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do_block enc_dround, enc_fround
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ENDPROC(aes_encrypt)
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.align 6
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aes_decrypt:
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add ip, r2, #32 @ 3rd round key
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do_block dec_dround, dec_fround
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ENDPROC(aes_decrypt)
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.align 6
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aes_encrypt_3x:
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add ip, r2, #32 @ 3rd round key
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do_block enc_dround_3x, enc_fround_3x
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ENDPROC(aes_encrypt_3x)
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.align 6
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aes_decrypt_3x:
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add ip, r2, #32 @ 3rd round key
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do_block dec_dround_3x, dec_fround_3x
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ENDPROC(aes_decrypt_3x)
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.macro prepare_key, rk, rounds
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add ip, \rk, \rounds, lsl #4
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vld1.8 {q8-q9}, [\rk] @ load first 2 round keys
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vld1.8 {q14}, [ip] @ load last round key
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.endm
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/*
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* aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks)
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* aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks)
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*/
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ENTRY(ce_aes_ecb_encrypt)
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push {r4, lr}
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ldr r4, [sp, #8]
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prepare_key r2, r3
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.Lecbencloop3x:
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subs r4, r4, #3
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bmi .Lecbenc1x
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vld1.8 {q0-q1}, [r1]!
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vld1.8 {q2}, [r1]!
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bl aes_encrypt_3x
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vst1.8 {q0-q1}, [r0]!
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vst1.8 {q2}, [r0]!
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b .Lecbencloop3x
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.Lecbenc1x:
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adds r4, r4, #3
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beq .Lecbencout
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.Lecbencloop:
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vld1.8 {q0}, [r1]!
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bl aes_encrypt
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vst1.8 {q0}, [r0]!
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subs r4, r4, #1
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bne .Lecbencloop
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.Lecbencout:
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pop {r4, pc}
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ENDPROC(ce_aes_ecb_encrypt)
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ENTRY(ce_aes_ecb_decrypt)
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push {r4, lr}
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ldr r4, [sp, #8]
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prepare_key r2, r3
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.Lecbdecloop3x:
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subs r4, r4, #3
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bmi .Lecbdec1x
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vld1.8 {q0-q1}, [r1]!
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vld1.8 {q2}, [r1]!
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bl aes_decrypt_3x
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vst1.8 {q0-q1}, [r0]!
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vst1.8 {q2}, [r0]!
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b .Lecbdecloop3x
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.Lecbdec1x:
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adds r4, r4, #3
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beq .Lecbdecout
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.Lecbdecloop:
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vld1.8 {q0}, [r1]!
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bl aes_decrypt
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vst1.8 {q0}, [r0]!
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subs r4, r4, #1
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bne .Lecbdecloop
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.Lecbdecout:
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pop {r4, pc}
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ENDPROC(ce_aes_ecb_decrypt)
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/*
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* aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks, u8 iv[])
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* aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks, u8 iv[])
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*/
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ENTRY(ce_aes_cbc_encrypt)
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push {r4-r6, lr}
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ldrd r4, r5, [sp, #16]
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vld1.8 {q0}, [r5]
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prepare_key r2, r3
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.Lcbcencloop:
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vld1.8 {q1}, [r1]! @ get next pt block
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veor q0, q0, q1 @ ..and xor with iv
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bl aes_encrypt
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vst1.8 {q0}, [r0]!
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subs r4, r4, #1
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bne .Lcbcencloop
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vst1.8 {q0}, [r5]
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pop {r4-r6, pc}
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ENDPROC(ce_aes_cbc_encrypt)
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ENTRY(ce_aes_cbc_decrypt)
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push {r4-r6, lr}
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ldrd r4, r5, [sp, #16]
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vld1.8 {q6}, [r5] @ keep iv in q6
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prepare_key r2, r3
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.Lcbcdecloop3x:
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subs r4, r4, #3
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bmi .Lcbcdec1x
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vld1.8 {q0-q1}, [r1]!
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vld1.8 {q2}, [r1]!
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vmov q3, q0
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vmov q4, q1
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vmov q5, q2
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bl aes_decrypt_3x
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veor q0, q0, q6
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veor q1, q1, q3
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veor q2, q2, q4
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vmov q6, q5
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vst1.8 {q0-q1}, [r0]!
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vst1.8 {q2}, [r0]!
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b .Lcbcdecloop3x
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.Lcbcdec1x:
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adds r4, r4, #3
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beq .Lcbcdecout
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vmov q15, q14 @ preserve last round key
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.Lcbcdecloop:
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vld1.8 {q0}, [r1]! @ get next ct block
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veor q14, q15, q6 @ combine prev ct with last key
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vmov q6, q0
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bl aes_decrypt
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vst1.8 {q0}, [r0]!
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subs r4, r4, #1
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bne .Lcbcdecloop
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.Lcbcdecout:
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vst1.8 {q6}, [r5] @ keep iv in q6
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pop {r4-r6, pc}
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ENDPROC(ce_aes_cbc_decrypt)
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/*
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* aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks, u8 ctr[])
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*/
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ENTRY(ce_aes_ctr_encrypt)
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push {r4-r6, lr}
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ldrd r4, r5, [sp, #16]
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vld1.8 {q6}, [r5] @ load ctr
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prepare_key r2, r3
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vmov r6, s27 @ keep swabbed ctr in r6
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rev r6, r6
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cmn r6, r4 @ 32 bit overflow?
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bcs .Lctrloop
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.Lctrloop3x:
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subs r4, r4, #3
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bmi .Lctr1x
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add r6, r6, #1
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vmov q0, q6
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vmov q1, q6
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rev ip, r6
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add r6, r6, #1
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vmov q2, q6
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vmov s7, ip
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rev ip, r6
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add r6, r6, #1
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vmov s11, ip
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vld1.8 {q3-q4}, [r1]!
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vld1.8 {q5}, [r1]!
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bl aes_encrypt_3x
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veor q0, q0, q3
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veor q1, q1, q4
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veor q2, q2, q5
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rev ip, r6
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vst1.8 {q0-q1}, [r0]!
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vst1.8 {q2}, [r0]!
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vmov s27, ip
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b .Lctrloop3x
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.Lctr1x:
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adds r4, r4, #3
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beq .Lctrout
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.Lctrloop:
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vmov q0, q6
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bl aes_encrypt
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subs r4, r4, #1
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bmi .Lctrtailblock @ blocks < 0 means tail block
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vld1.8 {q3}, [r1]!
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veor q3, q0, q3
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vst1.8 {q3}, [r0]!
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adds r6, r6, #1 @ increment BE ctr
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rev ip, r6
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vmov s27, ip
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bcs .Lctrcarry
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teq r4, #0
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bne .Lctrloop
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.Lctrout:
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vst1.8 {q6}, [r5]
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pop {r4-r6, pc}
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.Lctrtailblock:
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vst1.8 {q0}, [r0, :64] @ return just the key stream
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pop {r4-r6, pc}
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.Lctrcarry:
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.irp sreg, s26, s25, s24
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vmov ip, \sreg @ load next word of ctr
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rev ip, ip @ ... to handle the carry
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adds ip, ip, #1
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rev ip, ip
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vmov \sreg, ip
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bcc 0f
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.endr
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0: teq r4, #0
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beq .Lctrout
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b .Lctrloop
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ENDPROC(ce_aes_ctr_encrypt)
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/*
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* aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
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* int blocks, u8 iv[], u8 const rk2[], int first)
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* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
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* int blocks, u8 iv[], u8 const rk2[], int first)
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*/
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.macro next_tweak, out, in, const, tmp
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vshr.s64 \tmp, \in, #63
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vand \tmp, \tmp, \const
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vadd.u64 \out, \in, \in
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vext.8 \tmp, \tmp, \tmp, #8
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veor \out, \out, \tmp
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.endm
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.align 3
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.Lxts_mul_x:
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.quad 1, 0x87
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ce_aes_xts_init:
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vldr d14, .Lxts_mul_x
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vldr d15, .Lxts_mul_x + 8
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ldrd r4, r5, [sp, #16] @ load args
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ldr r6, [sp, #28]
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vld1.8 {q0}, [r5] @ load iv
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teq r6, #1 @ start of a block?
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bxne lr
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@ Encrypt the IV in q0 with the second AES key. This should only
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@ be done at the start of a block.
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ldr r6, [sp, #24] @ load AES key 2
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prepare_key r6, r3
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add ip, r6, #32 @ 3rd round key of key 2
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b .Laes_encrypt_tweak @ tail call
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ENDPROC(ce_aes_xts_init)
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ENTRY(ce_aes_xts_encrypt)
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push {r4-r6, lr}
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bl ce_aes_xts_init @ run shared prologue
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prepare_key r2, r3
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vmov q3, q0
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teq r6, #0 @ start of a block?
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bne .Lxtsenc3x
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.Lxtsencloop3x:
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next_tweak q3, q3, q7, q6
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.Lxtsenc3x:
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subs r4, r4, #3
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bmi .Lxtsenc1x
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vld1.8 {q0-q1}, [r1]! @ get 3 pt blocks
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vld1.8 {q2}, [r1]!
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next_tweak q4, q3, q7, q6
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veor q0, q0, q3
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next_tweak q5, q4, q7, q6
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veor q1, q1, q4
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veor q2, q2, q5
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bl aes_encrypt_3x
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veor q0, q0, q3
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veor q1, q1, q4
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veor q2, q2, q5
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vst1.8 {q0-q1}, [r0]! @ write 3 ct blocks
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vst1.8 {q2}, [r0]!
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vmov q3, q5
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teq r4, #0
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beq .Lxtsencout
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b .Lxtsencloop3x
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.Lxtsenc1x:
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adds r4, r4, #3
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beq .Lxtsencout
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.Lxtsencloop:
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vld1.8 {q0}, [r1]!
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veor q0, q0, q3
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bl aes_encrypt
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veor q0, q0, q3
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vst1.8 {q0}, [r0]!
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subs r4, r4, #1
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beq .Lxtsencout
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next_tweak q3, q3, q7, q6
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b .Lxtsencloop
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.Lxtsencout:
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vst1.8 {q3}, [r5]
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pop {r4-r6, pc}
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ENDPROC(ce_aes_xts_encrypt)
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ENTRY(ce_aes_xts_decrypt)
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push {r4-r6, lr}
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bl ce_aes_xts_init @ run shared prologue
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prepare_key r2, r3
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vmov q3, q0
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teq r6, #0 @ start of a block?
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bne .Lxtsdec3x
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.Lxtsdecloop3x:
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next_tweak q3, q3, q7, q6
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.Lxtsdec3x:
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subs r4, r4, #3
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bmi .Lxtsdec1x
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vld1.8 {q0-q1}, [r1]! @ get 3 ct blocks
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vld1.8 {q2}, [r1]!
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next_tweak q4, q3, q7, q6
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veor q0, q0, q3
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next_tweak q5, q4, q7, q6
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veor q1, q1, q4
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veor q2, q2, q5
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bl aes_decrypt_3x
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veor q0, q0, q3
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veor q1, q1, q4
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veor q2, q2, q5
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vst1.8 {q0-q1}, [r0]! @ write 3 pt blocks
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vst1.8 {q2}, [r0]!
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vmov q3, q5
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teq r4, #0
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beq .Lxtsdecout
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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)
|