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528 529 530 531 532 533 | /* * 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, x5 .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, x5, w6 st1 {v0.16b}, [x0], #16 subs w4, w4, #1 bne .Lcbcencloop 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, x5 .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, x5, w6 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 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 cbnz w6, .Lctrfirst /* 1st time around? */ umov x5, v4.d[1] /* keep swabbed ctr in reg */ rev x5, x5 #if INTERLEAVE >= 2 cmn w5, w4 /* 32 bit overflow? */ bcs .Lctrinc add x5, x5, #1 /* increment BE ctr */ b .LctrincNx #else b .Lctrinc #endif .Lctrfirst: enc_prepare w3, x2, x6 ld1 {v4.16b}, [x5] umov x5, v4.d[1] /* keep swabbed ctr in reg */ rev x5, x5 #if INTERLEAVE >= 2 cmn w5, 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, x5 add x5, x5, #1 ins v0.d[1], x7 rev x7, x5 add x5, x5, #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, w5 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 x5, x5, #INTERLEAVE #endif cbz w4, .LctroutNx .LctrincNx: rev x7, x5 ins v4.d[1], x7 b .LctrloopNx .LctroutNx: sub x5, x5, #1 rev x7, x5 ins v4.d[1], x7 b .Lctrout .Lctr1x: adds w4, w4, #INTERLEAVE beq .Lctrout #endif .Lctrloop: mov v0.16b, v4.16b encrypt_block v0, w3, x2, x6, w7 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 beq .Lctrout .Lctrinc: adds x5, x5, #1 /* increment BE ctr */ rev x7, x5 ins v4.d[1], x7 bcc .Lctrloop /* no overflow? */ 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 .Lctrloop .Lctrhalfblock: ld1 {v3.8b}, [x1] eor v3.8b, v0.8b, v3.8b st1 {v3.8b}, [x0] .Lctrout: FRAME_POP ret 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) |