| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * linux/arch/arm64/crypto/aes-modes.S - chaining mode wrappers for AES |
| * |
| * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> |
| */ |
| |
| /* included by aes-ce.S and aes-neon.S */ |
| |
| .text |
| .align 4 |
| |
| #ifndef MAX_STRIDE |
| #define MAX_STRIDE 4 |
| #endif |
| |
| #if MAX_STRIDE == 4 |
| #define ST4(x...) x |
| #define ST5(x...) |
| #else |
| #define ST4(x...) |
| #define ST5(x...) x |
| #endif |
| |
| SYM_FUNC_START_LOCAL(aes_encrypt_block4x) |
| encrypt_block4x v0, v1, v2, v3, w3, x2, x8, w7 |
| ret |
| SYM_FUNC_END(aes_encrypt_block4x) |
| |
| SYM_FUNC_START_LOCAL(aes_decrypt_block4x) |
| decrypt_block4x v0, v1, v2, v3, w3, x2, x8, w7 |
| ret |
| SYM_FUNC_END(aes_decrypt_block4x) |
| |
| #if MAX_STRIDE == 5 |
| SYM_FUNC_START_LOCAL(aes_encrypt_block5x) |
| encrypt_block5x v0, v1, v2, v3, v4, w3, x2, x8, w7 |
| ret |
| SYM_FUNC_END(aes_encrypt_block5x) |
| |
| SYM_FUNC_START_LOCAL(aes_decrypt_block5x) |
| decrypt_block5x v0, v1, v2, v3, v4, w3, x2, x8, w7 |
| ret |
| SYM_FUNC_END(aes_decrypt_block5x) |
| #endif |
| |
| /* |
| * 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) |
| */ |
| |
| AES_FUNC_START(aes_ecb_encrypt) |
| frame_push 0 |
| |
| enc_prepare w3, x2, x5 |
| |
| .LecbencloopNx: |
| subs w4, w4, #MAX_STRIDE |
| bmi .Lecbenc1x |
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */ |
| ST4( bl aes_encrypt_block4x ) |
| ST5( ld1 {v4.16b}, [x1], #16 ) |
| ST5( bl aes_encrypt_block5x ) |
| st1 {v0.16b-v3.16b}, [x0], #64 |
| ST5( st1 {v4.16b}, [x0], #16 ) |
| b .LecbencloopNx |
| .Lecbenc1x: |
| adds w4, w4, #MAX_STRIDE |
| beq .Lecbencout |
| .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_FUNC_END(aes_ecb_encrypt) |
| |
| |
| AES_FUNC_START(aes_ecb_decrypt) |
| frame_push 0 |
| |
| dec_prepare w3, x2, x5 |
| |
| .LecbdecloopNx: |
| subs w4, w4, #MAX_STRIDE |
| bmi .Lecbdec1x |
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */ |
| ST4( bl aes_decrypt_block4x ) |
| ST5( ld1 {v4.16b}, [x1], #16 ) |
| ST5( bl aes_decrypt_block5x ) |
| st1 {v0.16b-v3.16b}, [x0], #64 |
| ST5( st1 {v4.16b}, [x0], #16 ) |
| b .LecbdecloopNx |
| .Lecbdec1x: |
| adds w4, w4, #MAX_STRIDE |
| beq .Lecbdecout |
| .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_FUNC_END(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[]) |
| * aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[], |
| * int rounds, int blocks, u8 iv[], |
| * u32 const rk2[]); |
| * aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[], |
| * int rounds, int blocks, u8 iv[], |
| * u32 const rk2[]); |
| */ |
| |
| AES_FUNC_START(aes_essiv_cbc_encrypt) |
| ld1 {v4.16b}, [x5] /* get iv */ |
| |
| mov w8, #14 /* AES-256: 14 rounds */ |
| enc_prepare w8, x6, x7 |
| encrypt_block v4, w8, x6, x7, w9 |
| enc_switch_key w3, x2, x6 |
| b .Lcbcencloop4x |
| |
| AES_FUNC_START(aes_cbc_encrypt) |
| ld1 {v4.16b}, [x5] /* get iv */ |
| enc_prepare w3, x2, x6 |
| |
| .Lcbcencloop4x: |
| subs w4, w4, #4 |
| bmi .Lcbcenc1x |
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */ |
| eor v0.16b, v0.16b, v4.16b /* ..and xor with iv */ |
| encrypt_block v0, w3, x2, x6, w7 |
| eor v1.16b, v1.16b, v0.16b |
| encrypt_block v1, w3, x2, x6, w7 |
| eor v2.16b, v2.16b, v1.16b |
| encrypt_block v2, w3, x2, x6, w7 |
| eor v3.16b, v3.16b, v2.16b |
| encrypt_block v3, w3, x2, x6, w7 |
| st1 {v0.16b-v3.16b}, [x0], #64 |
| mov v4.16b, v3.16b |
| b .Lcbcencloop4x |
| .Lcbcenc1x: |
| adds w4, w4, #4 |
| beq .Lcbcencout |
| .Lcbcencloop: |
| ld1 {v0.16b}, [x1], #16 /* get next pt block */ |
| eor v4.16b, v4.16b, v0.16b /* ..and xor with iv */ |
| encrypt_block v4, w3, x2, x6, w7 |
| st1 {v4.16b}, [x0], #16 |
| subs w4, w4, #1 |
| bne .Lcbcencloop |
| .Lcbcencout: |
| st1 {v4.16b}, [x5] /* return iv */ |
| ret |
| AES_FUNC_END(aes_cbc_encrypt) |
| AES_FUNC_END(aes_essiv_cbc_encrypt) |
| |
| AES_FUNC_START(aes_essiv_cbc_decrypt) |
| ld1 {cbciv.16b}, [x5] /* get iv */ |
| |
| mov w8, #14 /* AES-256: 14 rounds */ |
| enc_prepare w8, x6, x7 |
| encrypt_block cbciv, w8, x6, x7, w9 |
| b .Lessivcbcdecstart |
| |
| AES_FUNC_START(aes_cbc_decrypt) |
| ld1 {cbciv.16b}, [x5] /* get iv */ |
| .Lessivcbcdecstart: |
| frame_push 0 |
| dec_prepare w3, x2, x6 |
| |
| .LcbcdecloopNx: |
| subs w4, w4, #MAX_STRIDE |
| bmi .Lcbcdec1x |
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */ |
| #if MAX_STRIDE == 5 |
| ld1 {v4.16b}, [x1], #16 /* get 1 ct block */ |
| mov v5.16b, v0.16b |
| mov v6.16b, v1.16b |
| mov v7.16b, v2.16b |
| bl aes_decrypt_block5x |
| sub x1, x1, #32 |
| eor v0.16b, v0.16b, cbciv.16b |
| eor v1.16b, v1.16b, v5.16b |
| ld1 {v5.16b}, [x1], #16 /* reload 1 ct block */ |
| ld1 {cbciv.16b}, [x1], #16 /* reload 1 ct block */ |
| eor v2.16b, v2.16b, v6.16b |
| eor v3.16b, v3.16b, v7.16b |
| eor v4.16b, v4.16b, v5.16b |
| #else |
| mov v4.16b, v0.16b |
| mov v5.16b, v1.16b |
| mov v6.16b, v2.16b |
| bl aes_decrypt_block4x |
| sub x1, x1, #16 |
| eor v0.16b, v0.16b, cbciv.16b |
| eor v1.16b, v1.16b, v4.16b |
| ld1 {cbciv.16b}, [x1], #16 /* reload 1 ct block */ |
| eor v2.16b, v2.16b, v5.16b |
| eor v3.16b, v3.16b, v6.16b |
| #endif |
| st1 {v0.16b-v3.16b}, [x0], #64 |
| ST5( st1 {v4.16b}, [x0], #16 ) |
| b .LcbcdecloopNx |
| .Lcbcdec1x: |
| adds w4, w4, #MAX_STRIDE |
| beq .Lcbcdecout |
| .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, cbciv.16b /* xor with iv => pt */ |
| mov cbciv.16b, v1.16b /* ct is next iv */ |
| st1 {v0.16b}, [x0], #16 |
| subs w4, w4, #1 |
| bne .Lcbcdecloop |
| .Lcbcdecout: |
| st1 {cbciv.16b}, [x5] /* return iv */ |
| frame_pop |
| ret |
| AES_FUNC_END(aes_cbc_decrypt) |
| AES_FUNC_END(aes_essiv_cbc_decrypt) |
| |
| |
| /* |
| * aes_cbc_cts_encrypt(u8 out[], u8 const in[], u32 const rk[], |
| * int rounds, int bytes, u8 const iv[]) |
| * aes_cbc_cts_decrypt(u8 out[], u8 const in[], u32 const rk[], |
| * int rounds, int bytes, u8 const iv[]) |
| */ |
| |
| AES_FUNC_START(aes_cbc_cts_encrypt) |
| adr_l x8, .Lcts_permute_table |
| sub x4, x4, #16 |
| add x9, x8, #32 |
| add x8, x8, x4 |
| sub x9, x9, x4 |
| ld1 {v3.16b}, [x8] |
| ld1 {v4.16b}, [x9] |
| |
| ld1 {v0.16b}, [x1], x4 /* overlapping loads */ |
| ld1 {v1.16b}, [x1] |
| |
| ld1 {v5.16b}, [x5] /* get iv */ |
| enc_prepare w3, x2, x6 |
| |
| eor v0.16b, v0.16b, v5.16b /* xor with iv */ |
| tbl v1.16b, {v1.16b}, v4.16b |
| encrypt_block v0, w3, x2, x6, w7 |
| |
| eor v1.16b, v1.16b, v0.16b |
| tbl v0.16b, {v0.16b}, v3.16b |
| encrypt_block v1, w3, x2, x6, w7 |
| |
| add x4, x0, x4 |
| st1 {v0.16b}, [x4] /* overlapping stores */ |
| st1 {v1.16b}, [x0] |
| ret |
| AES_FUNC_END(aes_cbc_cts_encrypt) |
| |
| AES_FUNC_START(aes_cbc_cts_decrypt) |
| adr_l x8, .Lcts_permute_table |
| sub x4, x4, #16 |
| add x9, x8, #32 |
| add x8, x8, x4 |
| sub x9, x9, x4 |
| ld1 {v3.16b}, [x8] |
| ld1 {v4.16b}, [x9] |
| |
| ld1 {v0.16b}, [x1], x4 /* overlapping loads */ |
| ld1 {v1.16b}, [x1] |
| |
| ld1 {v5.16b}, [x5] /* get iv */ |
| dec_prepare w3, x2, x6 |
| |
| decrypt_block v0, w3, x2, x6, w7 |
| tbl v2.16b, {v0.16b}, v3.16b |
| eor v2.16b, v2.16b, v1.16b |
| |
| tbx v0.16b, {v1.16b}, v4.16b |
| decrypt_block v0, w3, x2, x6, w7 |
| eor v0.16b, v0.16b, v5.16b /* xor with iv */ |
| |
| add x4, x0, x4 |
| st1 {v2.16b}, [x4] /* overlapping stores */ |
| st1 {v0.16b}, [x0] |
| ret |
| AES_FUNC_END(aes_cbc_cts_decrypt) |
| |
| .section ".rodata", "a" |
| .align 6 |
| .Lcts_permute_table: |
| .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
| .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
| .byte 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 |
| .byte 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf |
| .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
| .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
| .previous |
| |
| /* |
| * This macro generates the code for CTR and XCTR mode. |
| */ |
| .macro ctr_encrypt xctr |
| // Arguments |
| OUT .req x0 |
| IN .req x1 |
| KEY .req x2 |
| ROUNDS_W .req w3 |
| BYTES_W .req w4 |
| IV .req x5 |
| BYTE_CTR_W .req w6 // XCTR only |
| // Intermediate values |
| CTR_W .req w11 // XCTR only |
| CTR .req x11 // XCTR only |
| IV_PART .req x12 |
| BLOCKS .req x13 |
| BLOCKS_W .req w13 |
| |
| frame_push 0 |
| |
| enc_prepare ROUNDS_W, KEY, IV_PART |
| ld1 {vctr.16b}, [IV] |
| |
| /* |
| * Keep 64 bits of the IV in a register. For CTR mode this lets us |
| * easily increment the IV. For XCTR mode this lets us efficiently XOR |
| * the 64-bit counter with the IV. |
| */ |
| .if \xctr |
| umov IV_PART, vctr.d[0] |
| lsr CTR_W, BYTE_CTR_W, #4 |
| .else |
| umov IV_PART, vctr.d[1] |
| rev IV_PART, IV_PART |
| .endif |
| |
| .LctrloopNx\xctr: |
| add BLOCKS_W, BYTES_W, #15 |
| sub BYTES_W, BYTES_W, #MAX_STRIDE << 4 |
| lsr BLOCKS_W, BLOCKS_W, #4 |
| mov w8, #MAX_STRIDE |
| cmp BLOCKS_W, w8 |
| csel BLOCKS_W, BLOCKS_W, w8, lt |
| |
| /* |
| * Set up the counter values in v0-v{MAX_STRIDE-1}. |
| * |
| * If we are encrypting less than MAX_STRIDE blocks, the tail block |
| * handling code expects the last keystream block to be in |
| * v{MAX_STRIDE-1}. For example: if encrypting two blocks with |
| * MAX_STRIDE=5, then v3 and v4 should have the next two counter blocks. |
| */ |
| .if \xctr |
| add CTR, CTR, BLOCKS |
| .else |
| adds IV_PART, IV_PART, BLOCKS |
| .endif |
| mov v0.16b, vctr.16b |
| mov v1.16b, vctr.16b |
| mov v2.16b, vctr.16b |
| mov v3.16b, vctr.16b |
| ST5( mov v4.16b, vctr.16b ) |
| .if \xctr |
| sub x6, CTR, #MAX_STRIDE - 1 |
| sub x7, CTR, #MAX_STRIDE - 2 |
| sub x8, CTR, #MAX_STRIDE - 3 |
| sub x9, CTR, #MAX_STRIDE - 4 |
| ST5( sub x10, CTR, #MAX_STRIDE - 5 ) |
| eor x6, x6, IV_PART |
| eor x7, x7, IV_PART |
| eor x8, x8, IV_PART |
| eor x9, x9, IV_PART |
| ST5( eor x10, x10, IV_PART ) |
| mov v0.d[0], x6 |
| mov v1.d[0], x7 |
| mov v2.d[0], x8 |
| mov v3.d[0], x9 |
| ST5( mov v4.d[0], x10 ) |
| .else |
| bcs 0f |
| .subsection 1 |
| /* |
| * This subsection handles carries. |
| * |
| * Conditional branching here is allowed with respect to time |
| * invariance since the branches are dependent on the IV instead |
| * of the plaintext or key. This code is rarely executed in |
| * practice anyway. |
| */ |
| |
| /* Apply carry to outgoing counter. */ |
| 0: umov x8, vctr.d[0] |
| rev x8, x8 |
| add x8, x8, #1 |
| rev x8, x8 |
| ins vctr.d[0], x8 |
| |
| /* |
| * Apply carry to counter blocks if needed. |
| * |
| * Since the carry flag was set, we know 0 <= IV_PART < |
| * MAX_STRIDE. Using the value of IV_PART we can determine how |
| * many counter blocks need to be updated. |
| */ |
| cbz IV_PART, 2f |
| adr x16, 1f |
| sub x16, x16, IV_PART, lsl #3 |
| br x16 |
| bti c |
| mov v0.d[0], vctr.d[0] |
| bti c |
| mov v1.d[0], vctr.d[0] |
| bti c |
| mov v2.d[0], vctr.d[0] |
| bti c |
| mov v3.d[0], vctr.d[0] |
| ST5( bti c ) |
| ST5( mov v4.d[0], vctr.d[0] ) |
| 1: b 2f |
| .previous |
| |
| 2: rev x7, IV_PART |
| ins vctr.d[1], x7 |
| sub x7, IV_PART, #MAX_STRIDE - 1 |
| sub x8, IV_PART, #MAX_STRIDE - 2 |
| sub x9, IV_PART, #MAX_STRIDE - 3 |
| rev x7, x7 |
| rev x8, x8 |
| mov v1.d[1], x7 |
| rev x9, x9 |
| ST5( sub x10, IV_PART, #MAX_STRIDE - 4 ) |
| mov v2.d[1], x8 |
| ST5( rev x10, x10 ) |
| mov v3.d[1], x9 |
| ST5( mov v4.d[1], x10 ) |
| .endif |
| |
| /* |
| * If there are at least MAX_STRIDE blocks left, XOR the data with |
| * keystream and store. Otherwise jump to tail handling. |
| */ |
| tbnz BYTES_W, #31, .Lctrtail\xctr |
| ld1 {v5.16b-v7.16b}, [IN], #48 |
| ST4( bl aes_encrypt_block4x ) |
| ST5( bl aes_encrypt_block5x ) |
| eor v0.16b, v5.16b, v0.16b |
| ST4( ld1 {v5.16b}, [IN], #16 ) |
| eor v1.16b, v6.16b, v1.16b |
| ST5( ld1 {v5.16b-v6.16b}, [IN], #32 ) |
| eor v2.16b, v7.16b, v2.16b |
| eor v3.16b, v5.16b, v3.16b |
| ST5( eor v4.16b, v6.16b, v4.16b ) |
| st1 {v0.16b-v3.16b}, [OUT], #64 |
| ST5( st1 {v4.16b}, [OUT], #16 ) |
| cbz BYTES_W, .Lctrout\xctr |
| b .LctrloopNx\xctr |
| |
| .Lctrout\xctr: |
| .if !\xctr |
| st1 {vctr.16b}, [IV] /* return next CTR value */ |
| .endif |
| frame_pop |
| ret |
| |
| .Lctrtail\xctr: |
| /* |
| * Handle up to MAX_STRIDE * 16 - 1 bytes of plaintext |
| * |
| * This code expects the last keystream block to be in v{MAX_STRIDE-1}. |
| * For example: if encrypting two blocks with MAX_STRIDE=5, then v3 and |
| * v4 should have the next two counter blocks. |
| * |
| * This allows us to store the ciphertext by writing to overlapping |
| * regions of memory. Any invalid ciphertext blocks get overwritten by |
| * correctly computed blocks. This approach greatly simplifies the |
| * logic for storing the ciphertext. |
| */ |
| mov x16, #16 |
| ands w7, BYTES_W, #0xf |
| csel x13, x7, x16, ne |
| |
| ST5( cmp BYTES_W, #64 - (MAX_STRIDE << 4)) |
| ST5( csel x14, x16, xzr, gt ) |
| cmp BYTES_W, #48 - (MAX_STRIDE << 4) |
| csel x15, x16, xzr, gt |
| cmp BYTES_W, #32 - (MAX_STRIDE << 4) |
| csel x16, x16, xzr, gt |
| cmp BYTES_W, #16 - (MAX_STRIDE << 4) |
| |
| adr_l x9, .Lcts_permute_table |
| add x9, x9, x13 |
| ble .Lctrtail1x\xctr |
| |
| ST5( ld1 {v5.16b}, [IN], x14 ) |
| ld1 {v6.16b}, [IN], x15 |
| ld1 {v7.16b}, [IN], x16 |
| |
| ST4( bl aes_encrypt_block4x ) |
| ST5( bl aes_encrypt_block5x ) |
| |
| ld1 {v8.16b}, [IN], x13 |
| ld1 {v9.16b}, [IN] |
| ld1 {v10.16b}, [x9] |
| |
| ST4( eor v6.16b, v6.16b, v0.16b ) |
| ST4( eor v7.16b, v7.16b, v1.16b ) |
| ST4( tbl v3.16b, {v3.16b}, v10.16b ) |
| ST4( eor v8.16b, v8.16b, v2.16b ) |
| ST4( eor v9.16b, v9.16b, v3.16b ) |
| |
| ST5( eor v5.16b, v5.16b, v0.16b ) |
| ST5( eor v6.16b, v6.16b, v1.16b ) |
| ST5( tbl v4.16b, {v4.16b}, v10.16b ) |
| ST5( eor v7.16b, v7.16b, v2.16b ) |
| ST5( eor v8.16b, v8.16b, v3.16b ) |
| ST5( eor v9.16b, v9.16b, v4.16b ) |
| |
| ST5( st1 {v5.16b}, [OUT], x14 ) |
| st1 {v6.16b}, [OUT], x15 |
| st1 {v7.16b}, [OUT], x16 |
| add x13, x13, OUT |
| st1 {v9.16b}, [x13] // overlapping stores |
| st1 {v8.16b}, [OUT] |
| b .Lctrout\xctr |
| |
| .Lctrtail1x\xctr: |
| /* |
| * Handle <= 16 bytes of plaintext |
| * |
| * This code always reads and writes 16 bytes. To avoid out of bounds |
| * accesses, XCTR and CTR modes must use a temporary buffer when |
| * encrypting/decrypting less than 16 bytes. |
| * |
| * This code is unusual in that it loads the input and stores the output |
| * relative to the end of the buffers rather than relative to the start. |
| * This causes unusual behaviour when encrypting/decrypting less than 16 |
| * bytes; the end of the data is expected to be at the end of the |
| * temporary buffer rather than the start of the data being at the start |
| * of the temporary buffer. |
| */ |
| sub x8, x7, #16 |
| csel x7, x7, x8, eq |
| add IN, IN, x7 |
| add OUT, OUT, x7 |
| ld1 {v5.16b}, [IN] |
| ld1 {v6.16b}, [OUT] |
| ST5( mov v3.16b, v4.16b ) |
| encrypt_block v3, ROUNDS_W, KEY, x8, w7 |
| ld1 {v10.16b-v11.16b}, [x9] |
| tbl v3.16b, {v3.16b}, v10.16b |
| sshr v11.16b, v11.16b, #7 |
| eor v5.16b, v5.16b, v3.16b |
| bif v5.16b, v6.16b, v11.16b |
| st1 {v5.16b}, [OUT] |
| b .Lctrout\xctr |
| |
| // Arguments |
| .unreq OUT |
| .unreq IN |
| .unreq KEY |
| .unreq ROUNDS_W |
| .unreq BYTES_W |
| .unreq IV |
| .unreq BYTE_CTR_W // XCTR only |
| // Intermediate values |
| .unreq CTR_W // XCTR only |
| .unreq CTR // XCTR only |
| .unreq IV_PART |
| .unreq BLOCKS |
| .unreq BLOCKS_W |
| .endm |
| |
| /* |
| * aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, |
| * int bytes, u8 ctr[]) |
| * |
| * The input and output buffers must always be at least 16 bytes even if |
| * encrypting/decrypting less than 16 bytes. Otherwise out of bounds |
| * accesses will occur. The data to be encrypted/decrypted is expected |
| * to be at the end of this 16-byte temporary buffer rather than the |
| * start. |
| */ |
| |
| AES_FUNC_START(aes_ctr_encrypt) |
| ctr_encrypt 0 |
| AES_FUNC_END(aes_ctr_encrypt) |
| |
| /* |
| * aes_xctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, |
| * int bytes, u8 const iv[], int byte_ctr) |
| * |
| * The input and output buffers must always be at least 16 bytes even if |
| * encrypting/decrypting less than 16 bytes. Otherwise out of bounds |
| * accesses will occur. The data to be encrypted/decrypted is expected |
| * to be at the end of this 16-byte temporary buffer rather than the |
| * start. |
| */ |
| |
| AES_FUNC_START(aes_xctr_encrypt) |
| ctr_encrypt 1 |
| AES_FUNC_END(aes_xctr_encrypt) |
| |
| |
| /* |
| * aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds, |
| * int bytes, u8 const rk2[], u8 iv[], int first) |
| * aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds, |
| * int bytes, u8 const rk2[], u8 iv[], int first) |
| */ |
| |
| .macro next_tweak, out, in, tmp |
| sshr \tmp\().2d, \in\().2d, #63 |
| and \tmp\().16b, \tmp\().16b, xtsmask.16b |
| add \out\().2d, \in\().2d, \in\().2d |
| ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8 |
| eor \out\().16b, \out\().16b, \tmp\().16b |
| .endm |
| |
| .macro xts_load_mask, tmp |
| movi xtsmask.2s, #0x1 |
| movi \tmp\().2s, #0x87 |
| uzp1 xtsmask.4s, xtsmask.4s, \tmp\().4s |
| .endm |
| |
| AES_FUNC_START(aes_xts_encrypt) |
| frame_push 0 |
| |
| ld1 {v4.16b}, [x6] |
| xts_load_mask v8 |
| cbz w7, .Lxtsencnotfirst |
| |
| enc_prepare w3, x5, x8 |
| xts_cts_skip_tw w7, .LxtsencNx |
| encrypt_block v4, w3, x5, x8, w7 /* first tweak */ |
| enc_switch_key w3, x2, x8 |
| b .LxtsencNx |
| |
| .Lxtsencnotfirst: |
| enc_prepare w3, x2, x8 |
| .LxtsencloopNx: |
| next_tweak v4, v4, v8 |
| .LxtsencNx: |
| subs w4, w4, #64 |
| bmi .Lxtsenc1x |
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */ |
| next_tweak v5, v4, v8 |
| eor v0.16b, v0.16b, v4.16b |
| next_tweak v6, v5, v8 |
| eor v1.16b, v1.16b, v5.16b |
| eor v2.16b, v2.16b, v6.16b |
| next_tweak v7, v6, v8 |
| eor v3.16b, v3.16b, v7.16b |
| bl aes_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, .Lxtsencret |
| xts_reload_mask v8 |
| b .LxtsencloopNx |
| .Lxtsenc1x: |
| adds w4, w4, #64 |
| beq .Lxtsencout |
| subs w4, w4, #16 |
| bmi .LxtsencctsNx |
| .Lxtsencloop: |
| ld1 {v0.16b}, [x1], #16 |
| .Lxtsencctsout: |
| eor v0.16b, v0.16b, v4.16b |
| encrypt_block v0, w3, x2, x8, w7 |
| eor v0.16b, v0.16b, v4.16b |
| cbz w4, .Lxtsencout |
| subs w4, w4, #16 |
| next_tweak v4, v4, v8 |
| bmi .Lxtsenccts |
| st1 {v0.16b}, [x0], #16 |
| b .Lxtsencloop |
| .Lxtsencout: |
| st1 {v0.16b}, [x0] |
| .Lxtsencret: |
| st1 {v4.16b}, [x6] |
| frame_pop |
| ret |
| |
| .LxtsencctsNx: |
| mov v0.16b, v3.16b |
| sub x0, x0, #16 |
| .Lxtsenccts: |
| adr_l x8, .Lcts_permute_table |
| |
| add x1, x1, w4, sxtw /* rewind input pointer */ |
| add w4, w4, #16 /* # bytes in final block */ |
| add x9, x8, #32 |
| add x8, x8, x4 |
| sub x9, x9, x4 |
| add x4, x0, x4 /* output address of final block */ |
| |
| ld1 {v1.16b}, [x1] /* load final block */ |
| ld1 {v2.16b}, [x8] |
| ld1 {v3.16b}, [x9] |
| |
| tbl v2.16b, {v0.16b}, v2.16b |
| tbx v0.16b, {v1.16b}, v3.16b |
| st1 {v2.16b}, [x4] /* overlapping stores */ |
| mov w4, wzr |
| b .Lxtsencctsout |
| AES_FUNC_END(aes_xts_encrypt) |
| |
| AES_FUNC_START(aes_xts_decrypt) |
| frame_push 0 |
| |
| /* subtract 16 bytes if we are doing CTS */ |
| sub w8, w4, #0x10 |
| tst w4, #0xf |
| csel w4, w4, w8, eq |
| |
| ld1 {v4.16b}, [x6] |
| xts_load_mask v8 |
| xts_cts_skip_tw w7, .Lxtsdecskiptw |
| cbz w7, .Lxtsdecnotfirst |
| |
| enc_prepare w3, x5, x8 |
| encrypt_block v4, w3, x5, x8, w7 /* first tweak */ |
| .Lxtsdecskiptw: |
| dec_prepare w3, x2, x8 |
| b .LxtsdecNx |
| |
| .Lxtsdecnotfirst: |
| dec_prepare w3, x2, x8 |
| .LxtsdecloopNx: |
| next_tweak v4, v4, v8 |
| .LxtsdecNx: |
| subs w4, w4, #64 |
| bmi .Lxtsdec1x |
| ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */ |
| next_tweak v5, v4, v8 |
| eor v0.16b, v0.16b, v4.16b |
| next_tweak v6, v5, v8 |
| eor v1.16b, v1.16b, v5.16b |
| eor v2.16b, v2.16b, v6.16b |
| next_tweak v7, v6, v8 |
| eor v3.16b, v3.16b, v7.16b |
| bl aes_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 |
| xts_reload_mask v8 |
| b .LxtsdecloopNx |
| .Lxtsdec1x: |
| adds w4, w4, #64 |
| beq .Lxtsdecout |
| subs w4, w4, #16 |
| .Lxtsdecloop: |
| ld1 {v0.16b}, [x1], #16 |
| bmi .Lxtsdeccts |
| .Lxtsdecctsout: |
| eor v0.16b, v0.16b, v4.16b |
| decrypt_block v0, w3, x2, x8, w7 |
| eor v0.16b, v0.16b, v4.16b |
| st1 {v0.16b}, [x0], #16 |
| cbz w4, .Lxtsdecout |
| subs w4, w4, #16 |
| next_tweak v4, v4, v8 |
| b .Lxtsdecloop |
| .Lxtsdecout: |
| st1 {v4.16b}, [x6] |
| frame_pop |
| ret |
| |
| .Lxtsdeccts: |
| adr_l x8, .Lcts_permute_table |
| |
| add x1, x1, w4, sxtw /* rewind input pointer */ |
| add w4, w4, #16 /* # bytes in final block */ |
| add x9, x8, #32 |
| add x8, x8, x4 |
| sub x9, x9, x4 |
| add x4, x0, x4 /* output address of final block */ |
| |
| next_tweak v5, v4, v8 |
| |
| ld1 {v1.16b}, [x1] /* load final block */ |
| ld1 {v2.16b}, [x8] |
| ld1 {v3.16b}, [x9] |
| |
| eor v0.16b, v0.16b, v5.16b |
| decrypt_block v0, w3, x2, x8, w7 |
| eor v0.16b, v0.16b, v5.16b |
| |
| tbl v2.16b, {v0.16b}, v2.16b |
| tbx v0.16b, {v1.16b}, v3.16b |
| |
| st1 {v2.16b}, [x4] /* overlapping stores */ |
| mov w4, wzr |
| b .Lxtsdecctsout |
| AES_FUNC_END(aes_xts_decrypt) |
| |
| /* |
| * aes_mac_update(u8 const in[], u32 const rk[], int rounds, |
| * int blocks, u8 dg[], int enc_before, int enc_after) |
| */ |
| AES_FUNC_START(aes_mac_update) |
| ld1 {v0.16b}, [x4] /* get dg */ |
| enc_prepare w2, x1, x7 |
| cbz w5, .Lmacloop4x |
| |
| encrypt_block v0, w2, x1, x7, w8 |
| |
| .Lmacloop4x: |
| subs w3, w3, #4 |
| bmi .Lmac1x |
| ld1 {v1.16b-v4.16b}, [x0], #64 /* get next pt block */ |
| eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */ |
| encrypt_block v0, w2, x1, x7, w8 |
| eor v0.16b, v0.16b, v2.16b |
| encrypt_block v0, w2, x1, x7, w8 |
| eor v0.16b, v0.16b, v3.16b |
| encrypt_block v0, w2, x1, x7, w8 |
| eor v0.16b, v0.16b, v4.16b |
| cmp w3, wzr |
| csinv x5, x6, xzr, eq |
| cbz w5, .Lmacout |
| encrypt_block v0, w2, x1, x7, w8 |
| st1 {v0.16b}, [x4] /* return dg */ |
| cond_yield .Lmacout, x7, x8 |
| b .Lmacloop4x |
| .Lmac1x: |
| add w3, w3, #4 |
| .Lmacloop: |
| cbz w3, .Lmacout |
| ld1 {v1.16b}, [x0], #16 /* get next pt block */ |
| eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */ |
| |
| subs w3, w3, #1 |
| csinv x5, x6, xzr, eq |
| cbz w5, .Lmacout |
| |
| .Lmacenc: |
| encrypt_block v0, w2, x1, x7, w8 |
| b .Lmacloop |
| |
| .Lmacout: |
| st1 {v0.16b}, [x4] /* return dg */ |
| mov w0, w3 |
| ret |
| AES_FUNC_END(aes_mac_update) |
