498 lines
9.9 KiB
ArmAsm
498 lines
9.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
|
|
/*
|
|
* Copyright (C) 2016-2018 René van Dorst <opensource@vdorst.com>. All Rights Reserved.
|
|
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
|
|
*/
|
|
|
|
#define MASK_U32 0x3c
|
|
#define CHACHA20_BLOCK_SIZE 64
|
|
#define STACK_SIZE 32
|
|
|
|
#define X0 $t0
|
|
#define X1 $t1
|
|
#define X2 $t2
|
|
#define X3 $t3
|
|
#define X4 $t4
|
|
#define X5 $t5
|
|
#define X6 $t6
|
|
#define X7 $t7
|
|
#define X8 $t8
|
|
#define X9 $t9
|
|
#define X10 $v1
|
|
#define X11 $s6
|
|
#define X12 $s5
|
|
#define X13 $s4
|
|
#define X14 $s3
|
|
#define X15 $s2
|
|
/* Use regs which are overwritten on exit for Tx so we don't leak clear data. */
|
|
#define T0 $s1
|
|
#define T1 $s0
|
|
#define T(n) T ## n
|
|
#define X(n) X ## n
|
|
|
|
/* Input arguments */
|
|
#define STATE $a0
|
|
#define OUT $a1
|
|
#define IN $a2
|
|
#define BYTES $a3
|
|
|
|
/* Output argument */
|
|
/* NONCE[0] is kept in a register and not in memory.
|
|
* We don't want to touch original value in memory.
|
|
* Must be incremented every loop iteration.
|
|
*/
|
|
#define NONCE_0 $v0
|
|
|
|
/* SAVED_X and SAVED_CA are set in the jump table.
|
|
* Use regs which are overwritten on exit else we don't leak clear data.
|
|
* They are used to handling the last bytes which are not multiple of 4.
|
|
*/
|
|
#define SAVED_X X15
|
|
#define SAVED_CA $s7
|
|
|
|
#define IS_UNALIGNED $s7
|
|
|
|
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
|
|
#define MSB 0
|
|
#define LSB 3
|
|
#define ROTx rotl
|
|
#define ROTR(n) rotr n, 24
|
|
#define CPU_TO_LE32(n) \
|
|
wsbh n; \
|
|
rotr n, 16;
|
|
#else
|
|
#define MSB 3
|
|
#define LSB 0
|
|
#define ROTx rotr
|
|
#define CPU_TO_LE32(n)
|
|
#define ROTR(n)
|
|
#endif
|
|
|
|
#define FOR_EACH_WORD(x) \
|
|
x( 0); \
|
|
x( 1); \
|
|
x( 2); \
|
|
x( 3); \
|
|
x( 4); \
|
|
x( 5); \
|
|
x( 6); \
|
|
x( 7); \
|
|
x( 8); \
|
|
x( 9); \
|
|
x(10); \
|
|
x(11); \
|
|
x(12); \
|
|
x(13); \
|
|
x(14); \
|
|
x(15);
|
|
|
|
#define FOR_EACH_WORD_REV(x) \
|
|
x(15); \
|
|
x(14); \
|
|
x(13); \
|
|
x(12); \
|
|
x(11); \
|
|
x(10); \
|
|
x( 9); \
|
|
x( 8); \
|
|
x( 7); \
|
|
x( 6); \
|
|
x( 5); \
|
|
x( 4); \
|
|
x( 3); \
|
|
x( 2); \
|
|
x( 1); \
|
|
x( 0);
|
|
|
|
#define PLUS_ONE_0 1
|
|
#define PLUS_ONE_1 2
|
|
#define PLUS_ONE_2 3
|
|
#define PLUS_ONE_3 4
|
|
#define PLUS_ONE_4 5
|
|
#define PLUS_ONE_5 6
|
|
#define PLUS_ONE_6 7
|
|
#define PLUS_ONE_7 8
|
|
#define PLUS_ONE_8 9
|
|
#define PLUS_ONE_9 10
|
|
#define PLUS_ONE_10 11
|
|
#define PLUS_ONE_11 12
|
|
#define PLUS_ONE_12 13
|
|
#define PLUS_ONE_13 14
|
|
#define PLUS_ONE_14 15
|
|
#define PLUS_ONE_15 16
|
|
#define PLUS_ONE(x) PLUS_ONE_ ## x
|
|
#define _CONCAT3(a,b,c) a ## b ## c
|
|
#define CONCAT3(a,b,c) _CONCAT3(a,b,c)
|
|
|
|
#define STORE_UNALIGNED(x) \
|
|
CONCAT3(.Lchacha_mips_xor_unaligned_, PLUS_ONE(x), _b: ;) \
|
|
.if (x != 12); \
|
|
lw T0, (x*4)(STATE); \
|
|
.endif; \
|
|
lwl T1, (x*4)+MSB ## (IN); \
|
|
lwr T1, (x*4)+LSB ## (IN); \
|
|
.if (x == 12); \
|
|
addu X ## x, NONCE_0; \
|
|
.else; \
|
|
addu X ## x, T0; \
|
|
.endif; \
|
|
CPU_TO_LE32(X ## x); \
|
|
xor X ## x, T1; \
|
|
swl X ## x, (x*4)+MSB ## (OUT); \
|
|
swr X ## x, (x*4)+LSB ## (OUT);
|
|
|
|
#define STORE_ALIGNED(x) \
|
|
CONCAT3(.Lchacha_mips_xor_aligned_, PLUS_ONE(x), _b: ;) \
|
|
.if (x != 12); \
|
|
lw T0, (x*4)(STATE); \
|
|
.endif; \
|
|
lw T1, (x*4) ## (IN); \
|
|
.if (x == 12); \
|
|
addu X ## x, NONCE_0; \
|
|
.else; \
|
|
addu X ## x, T0; \
|
|
.endif; \
|
|
CPU_TO_LE32(X ## x); \
|
|
xor X ## x, T1; \
|
|
sw X ## x, (x*4) ## (OUT);
|
|
|
|
/* Jump table macro.
|
|
* Used for setup and handling the last bytes, which are not multiple of 4.
|
|
* X15 is free to store Xn
|
|
* Every jumptable entry must be equal in size.
|
|
*/
|
|
#define JMPTBL_ALIGNED(x) \
|
|
.Lchacha_mips_jmptbl_aligned_ ## x: ; \
|
|
.set noreorder; \
|
|
b .Lchacha_mips_xor_aligned_ ## x ## _b; \
|
|
.if (x == 12); \
|
|
addu SAVED_X, X ## x, NONCE_0; \
|
|
.else; \
|
|
addu SAVED_X, X ## x, SAVED_CA; \
|
|
.endif; \
|
|
.set reorder
|
|
|
|
#define JMPTBL_UNALIGNED(x) \
|
|
.Lchacha_mips_jmptbl_unaligned_ ## x: ; \
|
|
.set noreorder; \
|
|
b .Lchacha_mips_xor_unaligned_ ## x ## _b; \
|
|
.if (x == 12); \
|
|
addu SAVED_X, X ## x, NONCE_0; \
|
|
.else; \
|
|
addu SAVED_X, X ## x, SAVED_CA; \
|
|
.endif; \
|
|
.set reorder
|
|
|
|
#define AXR(A, B, C, D, K, L, M, N, V, W, Y, Z, S) \
|
|
addu X(A), X(K); \
|
|
addu X(B), X(L); \
|
|
addu X(C), X(M); \
|
|
addu X(D), X(N); \
|
|
xor X(V), X(A); \
|
|
xor X(W), X(B); \
|
|
xor X(Y), X(C); \
|
|
xor X(Z), X(D); \
|
|
rotl X(V), S; \
|
|
rotl X(W), S; \
|
|
rotl X(Y), S; \
|
|
rotl X(Z), S;
|
|
|
|
.text
|
|
.set reorder
|
|
.set noat
|
|
.globl chacha_crypt_arch
|
|
.ent chacha_crypt_arch
|
|
chacha_crypt_arch:
|
|
.frame $sp, STACK_SIZE, $ra
|
|
|
|
/* Load number of rounds */
|
|
lw $at, 16($sp)
|
|
|
|
addiu $sp, -STACK_SIZE
|
|
|
|
/* Return bytes = 0. */
|
|
beqz BYTES, .Lchacha_mips_end
|
|
|
|
lw NONCE_0, 48(STATE)
|
|
|
|
/* Save s0-s7 */
|
|
sw $s0, 0($sp)
|
|
sw $s1, 4($sp)
|
|
sw $s2, 8($sp)
|
|
sw $s3, 12($sp)
|
|
sw $s4, 16($sp)
|
|
sw $s5, 20($sp)
|
|
sw $s6, 24($sp)
|
|
sw $s7, 28($sp)
|
|
|
|
/* Test IN or OUT is unaligned.
|
|
* IS_UNALIGNED = ( IN | OUT ) & 0x00000003
|
|
*/
|
|
or IS_UNALIGNED, IN, OUT
|
|
andi IS_UNALIGNED, 0x3
|
|
|
|
b .Lchacha_rounds_start
|
|
|
|
.align 4
|
|
.Loop_chacha_rounds:
|
|
addiu IN, CHACHA20_BLOCK_SIZE
|
|
addiu OUT, CHACHA20_BLOCK_SIZE
|
|
addiu NONCE_0, 1
|
|
|
|
.Lchacha_rounds_start:
|
|
lw X0, 0(STATE)
|
|
lw X1, 4(STATE)
|
|
lw X2, 8(STATE)
|
|
lw X3, 12(STATE)
|
|
|
|
lw X4, 16(STATE)
|
|
lw X5, 20(STATE)
|
|
lw X6, 24(STATE)
|
|
lw X7, 28(STATE)
|
|
lw X8, 32(STATE)
|
|
lw X9, 36(STATE)
|
|
lw X10, 40(STATE)
|
|
lw X11, 44(STATE)
|
|
|
|
move X12, NONCE_0
|
|
lw X13, 52(STATE)
|
|
lw X14, 56(STATE)
|
|
lw X15, 60(STATE)
|
|
|
|
.Loop_chacha_xor_rounds:
|
|
addiu $at, -2
|
|
AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 16);
|
|
AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 12);
|
|
AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 8);
|
|
AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 7);
|
|
AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 16);
|
|
AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 12);
|
|
AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 8);
|
|
AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 7);
|
|
bnez $at, .Loop_chacha_xor_rounds
|
|
|
|
addiu BYTES, -(CHACHA20_BLOCK_SIZE)
|
|
|
|
/* Is data src/dst unaligned? Jump */
|
|
bnez IS_UNALIGNED, .Loop_chacha_unaligned
|
|
|
|
/* Set number rounds here to fill delayslot. */
|
|
lw $at, (STACK_SIZE+16)($sp)
|
|
|
|
/* BYTES < 0, it has no full block. */
|
|
bltz BYTES, .Lchacha_mips_no_full_block_aligned
|
|
|
|
FOR_EACH_WORD_REV(STORE_ALIGNED)
|
|
|
|
/* BYTES > 0? Loop again. */
|
|
bgtz BYTES, .Loop_chacha_rounds
|
|
|
|
/* Place this here to fill delay slot */
|
|
addiu NONCE_0, 1
|
|
|
|
/* BYTES < 0? Handle last bytes */
|
|
bltz BYTES, .Lchacha_mips_xor_bytes
|
|
|
|
.Lchacha_mips_xor_done:
|
|
/* Restore used registers */
|
|
lw $s0, 0($sp)
|
|
lw $s1, 4($sp)
|
|
lw $s2, 8($sp)
|
|
lw $s3, 12($sp)
|
|
lw $s4, 16($sp)
|
|
lw $s5, 20($sp)
|
|
lw $s6, 24($sp)
|
|
lw $s7, 28($sp)
|
|
|
|
/* Write NONCE_0 back to right location in state */
|
|
sw NONCE_0, 48(STATE)
|
|
|
|
.Lchacha_mips_end:
|
|
addiu $sp, STACK_SIZE
|
|
jr $ra
|
|
|
|
.Lchacha_mips_no_full_block_aligned:
|
|
/* Restore the offset on BYTES */
|
|
addiu BYTES, CHACHA20_BLOCK_SIZE
|
|
|
|
/* Get number of full WORDS */
|
|
andi $at, BYTES, MASK_U32
|
|
|
|
/* Load upper half of jump table addr */
|
|
lui T0, %hi(.Lchacha_mips_jmptbl_aligned_0)
|
|
|
|
/* Calculate lower half jump table offset */
|
|
ins T0, $at, 1, 6
|
|
|
|
/* Add offset to STATE */
|
|
addu T1, STATE, $at
|
|
|
|
/* Add lower half jump table addr */
|
|
addiu T0, %lo(.Lchacha_mips_jmptbl_aligned_0)
|
|
|
|
/* Read value from STATE */
|
|
lw SAVED_CA, 0(T1)
|
|
|
|
/* Store remaining bytecounter as negative value */
|
|
subu BYTES, $at, BYTES
|
|
|
|
jr T0
|
|
|
|
/* Jump table */
|
|
FOR_EACH_WORD(JMPTBL_ALIGNED)
|
|
|
|
|
|
.Loop_chacha_unaligned:
|
|
/* Set number rounds here to fill delayslot. */
|
|
lw $at, (STACK_SIZE+16)($sp)
|
|
|
|
/* BYTES > 0, it has no full block. */
|
|
bltz BYTES, .Lchacha_mips_no_full_block_unaligned
|
|
|
|
FOR_EACH_WORD_REV(STORE_UNALIGNED)
|
|
|
|
/* BYTES > 0? Loop again. */
|
|
bgtz BYTES, .Loop_chacha_rounds
|
|
|
|
/* Write NONCE_0 back to right location in state */
|
|
sw NONCE_0, 48(STATE)
|
|
|
|
.set noreorder
|
|
/* Fall through to byte handling */
|
|
bgez BYTES, .Lchacha_mips_xor_done
|
|
.Lchacha_mips_xor_unaligned_0_b:
|
|
.Lchacha_mips_xor_aligned_0_b:
|
|
/* Place this here to fill delay slot */
|
|
addiu NONCE_0, 1
|
|
.set reorder
|
|
|
|
.Lchacha_mips_xor_bytes:
|
|
addu IN, $at
|
|
addu OUT, $at
|
|
/* First byte */
|
|
lbu T1, 0(IN)
|
|
addiu $at, BYTES, 1
|
|
CPU_TO_LE32(SAVED_X)
|
|
ROTR(SAVED_X)
|
|
xor T1, SAVED_X
|
|
sb T1, 0(OUT)
|
|
beqz $at, .Lchacha_mips_xor_done
|
|
/* Second byte */
|
|
lbu T1, 1(IN)
|
|
addiu $at, BYTES, 2
|
|
ROTx SAVED_X, 8
|
|
xor T1, SAVED_X
|
|
sb T1, 1(OUT)
|
|
beqz $at, .Lchacha_mips_xor_done
|
|
/* Third byte */
|
|
lbu T1, 2(IN)
|
|
ROTx SAVED_X, 8
|
|
xor T1, SAVED_X
|
|
sb T1, 2(OUT)
|
|
b .Lchacha_mips_xor_done
|
|
|
|
.Lchacha_mips_no_full_block_unaligned:
|
|
/* Restore the offset on BYTES */
|
|
addiu BYTES, CHACHA20_BLOCK_SIZE
|
|
|
|
/* Get number of full WORDS */
|
|
andi $at, BYTES, MASK_U32
|
|
|
|
/* Load upper half of jump table addr */
|
|
lui T0, %hi(.Lchacha_mips_jmptbl_unaligned_0)
|
|
|
|
/* Calculate lower half jump table offset */
|
|
ins T0, $at, 1, 6
|
|
|
|
/* Add offset to STATE */
|
|
addu T1, STATE, $at
|
|
|
|
/* Add lower half jump table addr */
|
|
addiu T0, %lo(.Lchacha_mips_jmptbl_unaligned_0)
|
|
|
|
/* Read value from STATE */
|
|
lw SAVED_CA, 0(T1)
|
|
|
|
/* Store remaining bytecounter as negative value */
|
|
subu BYTES, $at, BYTES
|
|
|
|
jr T0
|
|
|
|
/* Jump table */
|
|
FOR_EACH_WORD(JMPTBL_UNALIGNED)
|
|
.end chacha_crypt_arch
|
|
.set at
|
|
|
|
/* Input arguments
|
|
* STATE $a0
|
|
* OUT $a1
|
|
* NROUND $a2
|
|
*/
|
|
|
|
#undef X12
|
|
#undef X13
|
|
#undef X14
|
|
#undef X15
|
|
|
|
#define X12 $a3
|
|
#define X13 $at
|
|
#define X14 $v0
|
|
#define X15 STATE
|
|
|
|
.set noat
|
|
.globl hchacha_block_arch
|
|
.ent hchacha_block_arch
|
|
hchacha_block_arch:
|
|
.frame $sp, STACK_SIZE, $ra
|
|
|
|
addiu $sp, -STACK_SIZE
|
|
|
|
/* Save X11(s6) */
|
|
sw X11, 0($sp)
|
|
|
|
lw X0, 0(STATE)
|
|
lw X1, 4(STATE)
|
|
lw X2, 8(STATE)
|
|
lw X3, 12(STATE)
|
|
lw X4, 16(STATE)
|
|
lw X5, 20(STATE)
|
|
lw X6, 24(STATE)
|
|
lw X7, 28(STATE)
|
|
lw X8, 32(STATE)
|
|
lw X9, 36(STATE)
|
|
lw X10, 40(STATE)
|
|
lw X11, 44(STATE)
|
|
lw X12, 48(STATE)
|
|
lw X13, 52(STATE)
|
|
lw X14, 56(STATE)
|
|
lw X15, 60(STATE)
|
|
|
|
.Loop_hchacha_xor_rounds:
|
|
addiu $a2, -2
|
|
AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 16);
|
|
AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 12);
|
|
AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 8);
|
|
AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 7);
|
|
AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 16);
|
|
AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 12);
|
|
AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 8);
|
|
AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 7);
|
|
bnez $a2, .Loop_hchacha_xor_rounds
|
|
|
|
/* Restore used register */
|
|
lw X11, 0($sp)
|
|
|
|
sw X0, 0(OUT)
|
|
sw X1, 4(OUT)
|
|
sw X2, 8(OUT)
|
|
sw X3, 12(OUT)
|
|
sw X12, 16(OUT)
|
|
sw X13, 20(OUT)
|
|
sw X14, 24(OUT)
|
|
sw X15, 28(OUT)
|
|
|
|
addiu $sp, STACK_SIZE
|
|
jr $ra
|
|
.end hchacha_block_arch
|
|
.set at
|