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| /*
| * linux/arch/arm64/crypto/aes-modes.S - chaining mode wrappers for AES
| *
| * Copyright (C) 2013 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.
| */
|
| /* included by aes-ce.S and aes-neon.S */
|
| .text
| .align 4
|
| /*
| * There are several ways to instantiate this code:
| * - no interleave, all inline
| * - 2-way interleave, 2x calls out of line (-DINTERLEAVE=2)
| * - 2-way interleave, all inline (-DINTERLEAVE=2 -DINTERLEAVE_INLINE)
| * - 4-way interleave, 4x calls out of line (-DINTERLEAVE=4)
| * - 4-way interleave, all inline (-DINTERLEAVE=4 -DINTERLEAVE_INLINE)
| *
| * Macros imported by this code:
| * - enc_prepare - setup NEON registers for encryption
| * - dec_prepare - setup NEON registers for decryption
| * - enc_switch_key - change to new key after having prepared for encryption
| * - encrypt_block - encrypt a single block
| * - decrypt block - decrypt a single block
| * - encrypt_block2x - encrypt 2 blocks in parallel (if INTERLEAVE == 2)
| * - decrypt_block2x - decrypt 2 blocks in parallel (if INTERLEAVE == 2)
| * - encrypt_block4x - encrypt 4 blocks in parallel (if INTERLEAVE == 4)
| * - decrypt_block4x - decrypt 4 blocks in parallel (if INTERLEAVE == 4)
| */
|
| #if defined(INTERLEAVE) && !defined(INTERLEAVE_INLINE)
| #define FRAME_PUSH stp x29, x30, [sp,#-16]! ; mov x29, sp
| #define FRAME_POP ldp x29, x30, [sp],#16
|
| #if INTERLEAVE == 2
|
| aes_encrypt_block2x:
| encrypt_block2x v0, v1, w3, x2, x6, w7
| ret
| ENDPROC(aes_encrypt_block2x)
|
| aes_decrypt_block2x:
| decrypt_block2x v0, v1, w3, x2, x6, w7
| ret
| ENDPROC(aes_decrypt_block2x)
|
| #elif INTERLEAVE == 4
|
| aes_encrypt_block4x:
| encrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
| ret
| ENDPROC(aes_encrypt_block4x)
|
| aes_decrypt_block4x:
| decrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
| ret
| ENDPROC(aes_decrypt_block4x)
|
| #else
| #error INTERLEAVE should equal 2 or 4
| #endif
|
| .macro do_encrypt_block2x
| bl aes_encrypt_block2x
| .endm
|
| .macro do_decrypt_block2x
| bl aes_decrypt_block2x
| .endm
|
| .macro do_encrypt_block4x
| bl aes_encrypt_block4x
| .endm
|
| .macro do_decrypt_block4x
| bl aes_decrypt_block4x
| .endm
|
| #else
| #define FRAME_PUSH
| #define FRAME_POP
|
| .macro do_encrypt_block2x
| encrypt_block2x v0, v1, w3, x2, x6, w7
| .endm
|
| .macro do_decrypt_block2x
| decrypt_block2x v0, v1, w3, x2, x6, w7
| .endm
|
| .macro do_encrypt_block4x
| encrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
| .endm
|
| .macro do_decrypt_block4x
| decrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
| .endm
|
| #endif
|
| /*
| * aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
| * int blocks, int first)
| * aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
| * int blocks, int first)
| */
|
| AES_ENTRY(aes_ecb_encrypt)
| FRAME_PUSH
| cbz w5, .LecbencloopNx
|
| enc_prepare w3, x2, x5
|
| .LecbencloopNx:
| #if INTERLEAVE >= 2
| subs w4, w4, #INTERLEAVE
| bmi .Lecbenc1x
| #if INTERLEAVE == 2
| ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 pt blocks */
| do_encrypt_block2x
| st1 {v0.16b-v1.16b}, [x0], #32
| #else
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
| do_encrypt_block4x
| st1 {v0.16b-v3.16b}, [x0], #64
| #endif
| b .LecbencloopNx
| .Lecbenc1x:
| adds w4, w4, #INTERLEAVE
| beq .Lecbencout
| #endif
| .Lecbencloop:
| ld1 {v0.16b}, [x1], #16 /* get next pt block */
| encrypt_block v0, w3, x2, x5, w6
| st1 {v0.16b}, [x0], #16
| subs w4, w4, #1
| bne .Lecbencloop
| .Lecbencout:
| FRAME_POP
| ret
| AES_ENDPROC(aes_ecb_encrypt)
|
|
| AES_ENTRY(aes_ecb_decrypt)
| FRAME_PUSH
| cbz w5, .LecbdecloopNx
|
| dec_prepare w3, x2, x5
|
| .LecbdecloopNx:
| #if INTERLEAVE >= 2
| subs w4, w4, #INTERLEAVE
| bmi .Lecbdec1x
| #if INTERLEAVE == 2
| ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
| do_decrypt_block2x
| st1 {v0.16b-v1.16b}, [x0], #32
| #else
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
| do_decrypt_block4x
| st1 {v0.16b-v3.16b}, [x0], #64
| #endif
| b .LecbdecloopNx
| .Lecbdec1x:
| adds w4, w4, #INTERLEAVE
| beq .Lecbdecout
| #endif
| .Lecbdecloop:
| ld1 {v0.16b}, [x1], #16 /* get next ct block */
| decrypt_block v0, w3, x2, x5, w6
| st1 {v0.16b}, [x0], #16
| subs w4, w4, #1
| bne .Lecbdecloop
| .Lecbdecout:
| FRAME_POP
| ret
| AES_ENDPROC(aes_ecb_decrypt)
|
|
| /*
| * aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
| * int blocks, u8 iv[], int first)
| * aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
| * int blocks, u8 iv[], int first)
| */
|
| AES_ENTRY(aes_cbc_encrypt)
| cbz w6, .Lcbcencloop
|
| ld1 {v0.16b}, [x5] /* get iv */
| enc_prepare w3, x2, x6
|
| .Lcbcencloop:
| ld1 {v1.16b}, [x1], #16 /* get next pt block */
| eor v0.16b, v0.16b, v1.16b /* ..and xor with iv */
| encrypt_block v0, w3, x2, x6, w7
| st1 {v0.16b}, [x0], #16
| subs w4, w4, #1
| bne .Lcbcencloop
| st1 {v0.16b}, [x5] /* return iv */
| ret
| AES_ENDPROC(aes_cbc_encrypt)
|
|
| AES_ENTRY(aes_cbc_decrypt)
| FRAME_PUSH
| cbz w6, .LcbcdecloopNx
|
| ld1 {v7.16b}, [x5] /* get iv */
| dec_prepare w3, x2, x6
|
| .LcbcdecloopNx:
| #if INTERLEAVE >= 2
| subs w4, w4, #INTERLEAVE
| bmi .Lcbcdec1x
| #if INTERLEAVE == 2
| ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
| mov v2.16b, v0.16b
| mov v3.16b, v1.16b
| do_decrypt_block2x
| eor v0.16b, v0.16b, v7.16b
| eor v1.16b, v1.16b, v2.16b
| mov v7.16b, v3.16b
| st1 {v0.16b-v1.16b}, [x0], #32
| #else
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
| mov v4.16b, v0.16b
| mov v5.16b, v1.16b
| mov v6.16b, v2.16b
| do_decrypt_block4x
| sub x1, x1, #16
| eor v0.16b, v0.16b, v7.16b
| eor v1.16b, v1.16b, v4.16b
| ld1 {v7.16b}, [x1], #16 /* reload 1 ct block */
| eor v2.16b, v2.16b, v5.16b
| eor v3.16b, v3.16b, v6.16b
| st1 {v0.16b-v3.16b}, [x0], #64
| #endif
| b .LcbcdecloopNx
| .Lcbcdec1x:
| adds w4, w4, #INTERLEAVE
| beq .Lcbcdecout
| #endif
| .Lcbcdecloop:
| ld1 {v1.16b}, [x1], #16 /* get next ct block */
| mov v0.16b, v1.16b /* ...and copy to v0 */
| decrypt_block v0, w3, x2, x6, w7
| eor v0.16b, v0.16b, v7.16b /* xor with iv => pt */
| mov v7.16b, v1.16b /* ct is next iv */
| st1 {v0.16b}, [x0], #16
| subs w4, w4, #1
| bne .Lcbcdecloop
| .Lcbcdecout:
| FRAME_POP
| st1 {v7.16b}, [x5] /* return iv */
| ret
| AES_ENDPROC(aes_cbc_decrypt)
|
|
| /*
| * aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
| * int blocks, u8 ctr[], int first)
| */
|
| AES_ENTRY(aes_ctr_encrypt)
| FRAME_PUSH
| cbz w6, .Lctrnotfirst /* 1st time around? */
| enc_prepare w3, x2, x6
| ld1 {v4.16b}, [x5]
|
| .Lctrnotfirst:
| umov x8, v4.d[1] /* keep swabbed ctr in reg */
| rev x8, x8
| #if INTERLEAVE >= 2
| cmn w8, w4 /* 32 bit overflow? */
| bcs .Lctrloop
| .LctrloopNx:
| subs w4, w4, #INTERLEAVE
| bmi .Lctr1x
| #if INTERLEAVE == 2
| mov v0.8b, v4.8b
| mov v1.8b, v4.8b
| rev x7, x8
| add x8, x8, #1
| ins v0.d[1], x7
| rev x7, x8
| add x8, x8, #1
| ins v1.d[1], x7
| ld1 {v2.16b-v3.16b}, [x1], #32 /* get 2 input blocks */
| do_encrypt_block2x
| eor v0.16b, v0.16b, v2.16b
| eor v1.16b, v1.16b, v3.16b
| st1 {v0.16b-v1.16b}, [x0], #32
| #else
| ldr q8, =0x30000000200000001 /* addends 1,2,3[,0] */
| dup v7.4s, w8
| mov v0.16b, v4.16b
| add v7.4s, v7.4s, v8.4s
| mov v1.16b, v4.16b
| rev32 v8.16b, v7.16b
| mov v2.16b, v4.16b
| mov v3.16b, v4.16b
| mov v1.s[3], v8.s[0]
| mov v2.s[3], v8.s[1]
| mov v3.s[3], v8.s[2]
| ld1 {v5.16b-v7.16b}, [x1], #48 /* get 3 input blocks */
| do_encrypt_block4x
| eor v0.16b, v5.16b, v0.16b
| ld1 {v5.16b}, [x1], #16 /* get 1 input block */
| eor v1.16b, v6.16b, v1.16b
| eor v2.16b, v7.16b, v2.16b
| eor v3.16b, v5.16b, v3.16b
| st1 {v0.16b-v3.16b}, [x0], #64
| add x8, x8, #INTERLEAVE
| #endif
| rev x7, x8
| ins v4.d[1], x7
| cbz w4, .Lctrout
| b .LctrloopNx
| .Lctr1x:
| adds w4, w4, #INTERLEAVE
| beq .Lctrout
| #endif
| .Lctrloop:
| mov v0.16b, v4.16b
| encrypt_block v0, w3, x2, x6, w7
|
| adds x8, x8, #1 /* increment BE ctr */
| rev x7, x8
| ins v4.d[1], x7
| bcs .Lctrcarry /* overflow? */
|
| .Lctrcarrydone:
| subs w4, w4, #1
| bmi .Lctrhalfblock /* blocks < 0 means 1/2 block */
| ld1 {v3.16b}, [x1], #16
| eor v3.16b, v0.16b, v3.16b
| st1 {v3.16b}, [x0], #16
| bne .Lctrloop
|
| .Lctrout:
| st1 {v4.16b}, [x5] /* return next CTR value */
| FRAME_POP
| ret
|
| .Lctrhalfblock:
| ld1 {v3.8b}, [x1]
| eor v3.8b, v0.8b, v3.8b
| st1 {v3.8b}, [x0]
| FRAME_POP
| ret
|
| .Lctrcarry:
| umov x7, v4.d[0] /* load upper word of ctr */
| rev x7, x7 /* ... to handle the carry */
| add x7, x7, #1
| rev x7, x7
| ins v4.d[0], x7
| b .Lctrcarrydone
| AES_ENDPROC(aes_ctr_encrypt)
| .ltorg
|
|
| /*
| * aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
| * int blocks, u8 const rk2[], u8 iv[], int first)
| * aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
| * int blocks, u8 const rk2[], u8 iv[], int first)
| */
|
| .macro next_tweak, out, in, const, tmp
| sshr \tmp\().2d, \in\().2d, #63
| and \tmp\().16b, \tmp\().16b, \const\().16b
| add \out\().2d, \in\().2d, \in\().2d
| ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8
| eor \out\().16b, \out\().16b, \tmp\().16b
| .endm
|
| .Lxts_mul_x:
| CPU_LE( .quad 1, 0x87 )
| CPU_BE( .quad 0x87, 1 )
|
| AES_ENTRY(aes_xts_encrypt)
| FRAME_PUSH
| cbz w7, .LxtsencloopNx
|
| ld1 {v4.16b}, [x6]
| enc_prepare w3, x5, x6
| encrypt_block v4, w3, x5, x6, w7 /* first tweak */
| enc_switch_key w3, x2, x6
| ldr q7, .Lxts_mul_x
| b .LxtsencNx
|
| .LxtsencloopNx:
| ldr q7, .Lxts_mul_x
| next_tweak v4, v4, v7, v8
| .LxtsencNx:
| #if INTERLEAVE >= 2
| subs w4, w4, #INTERLEAVE
| bmi .Lxtsenc1x
| #if INTERLEAVE == 2
| ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 pt blocks */
| next_tweak v5, v4, v7, v8
| eor v0.16b, v0.16b, v4.16b
| eor v1.16b, v1.16b, v5.16b
| do_encrypt_block2x
| eor v0.16b, v0.16b, v4.16b
| eor v1.16b, v1.16b, v5.16b
| st1 {v0.16b-v1.16b}, [x0], #32
| cbz w4, .LxtsencoutNx
| next_tweak v4, v5, v7, v8
| b .LxtsencNx
| .LxtsencoutNx:
| mov v4.16b, v5.16b
| b .Lxtsencout
| #else
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
| next_tweak v5, v4, v7, v8
| eor v0.16b, v0.16b, v4.16b
| next_tweak v6, v5, v7, v8
| eor v1.16b, v1.16b, v5.16b
| eor v2.16b, v2.16b, v6.16b
| next_tweak v7, v6, v7, v8
| eor v3.16b, v3.16b, v7.16b
| do_encrypt_block4x
| eor v3.16b, v3.16b, v7.16b
| eor v0.16b, v0.16b, v4.16b
| eor v1.16b, v1.16b, v5.16b
| eor v2.16b, v2.16b, v6.16b
| st1 {v0.16b-v3.16b}, [x0], #64
| mov v4.16b, v7.16b
| cbz w4, .Lxtsencout
| b .LxtsencloopNx
| #endif
| .Lxtsenc1x:
| adds w4, w4, #INTERLEAVE
| beq .Lxtsencout
| #endif
| .Lxtsencloop:
| ld1 {v1.16b}, [x1], #16
| eor v0.16b, v1.16b, v4.16b
| encrypt_block v0, w3, x2, x6, w7
| eor v0.16b, v0.16b, v4.16b
| st1 {v0.16b}, [x0], #16
| subs w4, w4, #1
| beq .Lxtsencout
| next_tweak v4, v4, v7, v8
| b .Lxtsencloop
| .Lxtsencout:
| FRAME_POP
| ret
| AES_ENDPROC(aes_xts_encrypt)
|
|
| AES_ENTRY(aes_xts_decrypt)
| FRAME_PUSH
| cbz w7, .LxtsdecloopNx
|
| ld1 {v4.16b}, [x6]
| enc_prepare w3, x5, x6
| encrypt_block v4, w3, x5, x6, w7 /* first tweak */
| dec_prepare w3, x2, x6
| ldr q7, .Lxts_mul_x
| b .LxtsdecNx
|
| .LxtsdecloopNx:
| ldr q7, .Lxts_mul_x
| next_tweak v4, v4, v7, v8
| .LxtsdecNx:
| #if INTERLEAVE >= 2
| subs w4, w4, #INTERLEAVE
| bmi .Lxtsdec1x
| #if INTERLEAVE == 2
| ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
| next_tweak v5, v4, v7, v8
| eor v0.16b, v0.16b, v4.16b
| eor v1.16b, v1.16b, v5.16b
| do_decrypt_block2x
| eor v0.16b, v0.16b, v4.16b
| eor v1.16b, v1.16b, v5.16b
| st1 {v0.16b-v1.16b}, [x0], #32
| cbz w4, .LxtsdecoutNx
| next_tweak v4, v5, v7, v8
| b .LxtsdecNx
| .LxtsdecoutNx:
| mov v4.16b, v5.16b
| b .Lxtsdecout
| #else
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
| next_tweak v5, v4, v7, v8
| eor v0.16b, v0.16b, v4.16b
| next_tweak v6, v5, v7, v8
| eor v1.16b, v1.16b, v5.16b
| eor v2.16b, v2.16b, v6.16b
| next_tweak v7, v6, v7, v8
| eor v3.16b, v3.16b, v7.16b
| do_decrypt_block4x
| eor v3.16b, v3.16b, v7.16b
| eor v0.16b, v0.16b, v4.16b
| eor v1.16b, v1.16b, v5.16b
| eor v2.16b, v2.16b, v6.16b
| st1 {v0.16b-v3.16b}, [x0], #64
| mov v4.16b, v7.16b
| cbz w4, .Lxtsdecout
| b .LxtsdecloopNx
| #endif
| .Lxtsdec1x:
| adds w4, w4, #INTERLEAVE
| beq .Lxtsdecout
| #endif
| .Lxtsdecloop:
| ld1 {v1.16b}, [x1], #16
| eor v0.16b, v1.16b, v4.16b
| decrypt_block v0, w3, x2, x6, w7
| eor v0.16b, v0.16b, v4.16b
| st1 {v0.16b}, [x0], #16
| subs w4, w4, #1
| beq .Lxtsdecout
| next_tweak v4, v4, v7, v8
| b .Lxtsdecloop
| .Lxtsdecout:
| FRAME_POP
| ret
| AES_ENDPROC(aes_xts_decrypt)
|
|
