| /* |
| * 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, :64]! |
| vld1.8 {q2}, [r1, :64]! |
| bl aes_encrypt_3x |
| vst1.8 {q0-q1}, [r0, :64]! |
| vst1.8 {q2}, [r0, :64]! |
| b .Lecbencloop3x |
| .Lecbenc1x: |
| adds r4, r4, #3 |
| beq .Lecbencout |
| .Lecbencloop: |
| vld1.8 {q0}, [r1, :64]! |
| bl aes_encrypt |
| vst1.8 {q0}, [r0, :64]! |
| 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, :64]! |
| vld1.8 {q2}, [r1, :64]! |
| bl aes_decrypt_3x |
| vst1.8 {q0-q1}, [r0, :64]! |
| vst1.8 {q2}, [r0, :64]! |
| b .Lecbdecloop3x |
| .Lecbdec1x: |
| adds r4, r4, #3 |
| beq .Lecbdecout |
| .Lecbdecloop: |
| vld1.8 {q0}, [r1, :64]! |
| bl aes_decrypt |
| vst1.8 {q0}, [r0, :64]! |
| 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, :64]! @ get next pt block |
| veor q0, q0, q1 @ ..and xor with iv |
| bl aes_encrypt |
| vst1.8 {q0}, [r0, :64]! |
| 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, :64]! |
| vld1.8 {q2}, [r1, :64]! |
| 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, :64]! |
| vst1.8 {q2}, [r0, :64]! |
| b .Lcbcdecloop3x |
| .Lcbcdec1x: |
| adds r4, r4, #3 |
| beq .Lcbcdecout |
| vmov q15, q14 @ preserve last round key |
| .Lcbcdecloop: |
| vld1.8 {q0}, [r1, :64]! @ get next ct block |
| veor q14, q15, q6 @ combine prev ct with last key |
| vmov q6, q0 |
| bl aes_decrypt |
| vst1.8 {q0}, [r0, :64]! |
| 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, :64]! |
| vld1.8 {q5}, [r1, :64]! |
| bl aes_encrypt_3x |
| veor q0, q0, q3 |
| veor q1, q1, q4 |
| veor q2, q2, q5 |
| rev ip, r6 |
| vst1.8 {q0-q1}, [r0, :64]! |
| vst1.8 {q2}, [r0, :64]! |
| vmov s27, ip |
| b .Lctrloop3x |
| .Lctr1x: |
| adds r4, r4, #3 |
| beq .Lctrout |
| .Lctrloop: |
| vmov q0, q6 |
| bl aes_encrypt |
| subs r4, r4, #1 |
| bmi .Lctrhalfblock @ blocks < 0 means 1/2 block |
| vld1.8 {q3}, [r1, :64]! |
| veor q3, q0, q3 |
| vst1.8 {q3}, [r0, :64]! |
| |
| 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} |
| |
| .Lctrhalfblock: |
| vld1.8 {d1}, [r1, :64] |
| veor d0, d0, d1 |
| vst1.8 {d0}, [r0, :64] |
| 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, :64]! @ get 3 pt blocks |
| vld1.8 {q2}, [r1, :64]! |
| 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, :64]! @ write 3 ct blocks |
| vst1.8 {q2}, [r0, :64]! |
| vmov q3, q5 |
| teq r4, #0 |
| beq .Lxtsencout |
| b .Lxtsencloop3x |
| .Lxtsenc1x: |
| adds r4, r4, #3 |
| beq .Lxtsencout |
| .Lxtsencloop: |
| vld1.8 {q0}, [r1, :64]! |
| veor q0, q0, q3 |
| bl aes_encrypt |
| veor q0, q0, q3 |
| vst1.8 {q0}, [r0, :64]! |
| 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, :64]! @ get 3 ct blocks |
| vld1.8 {q2}, [r1, :64]! |
| 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, :64]! @ write 3 pt blocks |
| vst1.8 {q2}, [r0, :64]! |
| vmov q3, q5 |
| teq r4, #0 |
| beq .Lxtsdecout |
| b .Lxtsdecloop3x |
| .Lxtsdec1x: |
| adds r4, r4, #3 |
| beq .Lxtsdecout |
| .Lxtsdecloop: |
| vld1.8 {q0}, [r1, :64]! |
| veor q0, q0, q3 |
| add ip, r2, #32 @ 3rd round key |
| bl aes_decrypt |
| veor q0, q0, q3 |
| vst1.8 {q0}, [r0, :64]! |
| 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) |
