626 строки
14 KiB
ArmAsm
626 строки
14 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* AES modes (ECB/CBC/CTR/XTS) for PPC AES implementation
|
|
*
|
|
* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
|
|
*/
|
|
|
|
#include <asm/ppc_asm.h>
|
|
#include "aes-spe-regs.h"
|
|
|
|
#ifdef __BIG_ENDIAN__ /* Macros for big endian builds */
|
|
|
|
#define LOAD_DATA(reg, off) \
|
|
lwz reg,off(rSP); /* load with offset */
|
|
#define SAVE_DATA(reg, off) \
|
|
stw reg,off(rDP); /* save with offset */
|
|
#define NEXT_BLOCK \
|
|
addi rSP,rSP,16; /* increment pointers per bloc */ \
|
|
addi rDP,rDP,16;
|
|
#define LOAD_IV(reg, off) \
|
|
lwz reg,off(rIP); /* IV loading with offset */
|
|
#define SAVE_IV(reg, off) \
|
|
stw reg,off(rIP); /* IV saving with offset */
|
|
#define START_IV /* nothing to reset */
|
|
#define CBC_DEC 16 /* CBC decrement per block */
|
|
#define CTR_DEC 1 /* CTR decrement one byte */
|
|
|
|
#else /* Macros for little endian */
|
|
|
|
#define LOAD_DATA(reg, off) \
|
|
lwbrx reg,0,rSP; /* load reversed */ \
|
|
addi rSP,rSP,4; /* and increment pointer */
|
|
#define SAVE_DATA(reg, off) \
|
|
stwbrx reg,0,rDP; /* save reversed */ \
|
|
addi rDP,rDP,4; /* and increment pointer */
|
|
#define NEXT_BLOCK /* nothing todo */
|
|
#define LOAD_IV(reg, off) \
|
|
lwbrx reg,0,rIP; /* load reversed */ \
|
|
addi rIP,rIP,4; /* and increment pointer */
|
|
#define SAVE_IV(reg, off) \
|
|
stwbrx reg,0,rIP; /* load reversed */ \
|
|
addi rIP,rIP,4; /* and increment pointer */
|
|
#define START_IV \
|
|
subi rIP,rIP,16; /* must reset pointer */
|
|
#define CBC_DEC 32 /* 2 blocks because of incs */
|
|
#define CTR_DEC 17 /* 1 block because of incs */
|
|
|
|
#endif
|
|
|
|
#define SAVE_0_REGS
|
|
#define LOAD_0_REGS
|
|
|
|
#define SAVE_4_REGS \
|
|
stw rI0,96(r1); /* save 32 bit registers */ \
|
|
stw rI1,100(r1); \
|
|
stw rI2,104(r1); \
|
|
stw rI3,108(r1);
|
|
|
|
#define LOAD_4_REGS \
|
|
lwz rI0,96(r1); /* restore 32 bit registers */ \
|
|
lwz rI1,100(r1); \
|
|
lwz rI2,104(r1); \
|
|
lwz rI3,108(r1);
|
|
|
|
#define SAVE_8_REGS \
|
|
SAVE_4_REGS \
|
|
stw rG0,112(r1); /* save 32 bit registers */ \
|
|
stw rG1,116(r1); \
|
|
stw rG2,120(r1); \
|
|
stw rG3,124(r1);
|
|
|
|
#define LOAD_8_REGS \
|
|
LOAD_4_REGS \
|
|
lwz rG0,112(r1); /* restore 32 bit registers */ \
|
|
lwz rG1,116(r1); \
|
|
lwz rG2,120(r1); \
|
|
lwz rG3,124(r1);
|
|
|
|
#define INITIALIZE_CRYPT(tab,nr32bitregs) \
|
|
mflr r0; \
|
|
stwu r1,-160(r1); /* create stack frame */ \
|
|
lis rT0,tab@h; /* en-/decryption table pointer */ \
|
|
stw r0,8(r1); /* save link register */ \
|
|
ori rT0,rT0,tab@l; \
|
|
evstdw r14,16(r1); \
|
|
mr rKS,rKP; \
|
|
evstdw r15,24(r1); /* We must save non volatile */ \
|
|
evstdw r16,32(r1); /* registers. Take the chance */ \
|
|
evstdw r17,40(r1); /* and save the SPE part too */ \
|
|
evstdw r18,48(r1); \
|
|
evstdw r19,56(r1); \
|
|
evstdw r20,64(r1); \
|
|
evstdw r21,72(r1); \
|
|
evstdw r22,80(r1); \
|
|
evstdw r23,88(r1); \
|
|
SAVE_##nr32bitregs##_REGS
|
|
|
|
#define FINALIZE_CRYPT(nr32bitregs) \
|
|
lwz r0,8(r1); \
|
|
evldw r14,16(r1); /* restore SPE registers */ \
|
|
evldw r15,24(r1); \
|
|
evldw r16,32(r1); \
|
|
evldw r17,40(r1); \
|
|
evldw r18,48(r1); \
|
|
evldw r19,56(r1); \
|
|
evldw r20,64(r1); \
|
|
evldw r21,72(r1); \
|
|
evldw r22,80(r1); \
|
|
evldw r23,88(r1); \
|
|
LOAD_##nr32bitregs##_REGS \
|
|
mtlr r0; /* restore link register */ \
|
|
xor r0,r0,r0; \
|
|
stw r0,16(r1); /* delete sensitive data */ \
|
|
stw r0,24(r1); /* that we might have pushed */ \
|
|
stw r0,32(r1); /* from other context that runs */ \
|
|
stw r0,40(r1); /* the same code */ \
|
|
stw r0,48(r1); \
|
|
stw r0,56(r1); \
|
|
stw r0,64(r1); \
|
|
stw r0,72(r1); \
|
|
stw r0,80(r1); \
|
|
stw r0,88(r1); \
|
|
addi r1,r1,160; /* cleanup stack frame */
|
|
|
|
#define ENDIAN_SWAP(t0, t1, s0, s1) \
|
|
rotrwi t0,s0,8; /* swap endianness for 2 GPRs */ \
|
|
rotrwi t1,s1,8; \
|
|
rlwimi t0,s0,8,8,15; \
|
|
rlwimi t1,s1,8,8,15; \
|
|
rlwimi t0,s0,8,24,31; \
|
|
rlwimi t1,s1,8,24,31;
|
|
|
|
#define GF128_MUL(d0, d1, d2, d3, t0) \
|
|
li t0,0x87; /* multiplication in GF128 */ \
|
|
cmpwi d3,-1; \
|
|
iselgt t0,0,t0; \
|
|
rlwimi d3,d2,0,0,0; /* propagate "carry" bits */ \
|
|
rotlwi d3,d3,1; \
|
|
rlwimi d2,d1,0,0,0; \
|
|
rotlwi d2,d2,1; \
|
|
rlwimi d1,d0,0,0,0; \
|
|
slwi d0,d0,1; /* shift left 128 bit */ \
|
|
rotlwi d1,d1,1; \
|
|
xor d0,d0,t0;
|
|
|
|
#define START_KEY(d0, d1, d2, d3) \
|
|
lwz rW0,0(rKP); \
|
|
mtctr rRR; \
|
|
lwz rW1,4(rKP); \
|
|
lwz rW2,8(rKP); \
|
|
lwz rW3,12(rKP); \
|
|
xor rD0,d0,rW0; \
|
|
xor rD1,d1,rW1; \
|
|
xor rD2,d2,rW2; \
|
|
xor rD3,d3,rW3;
|
|
|
|
/*
|
|
* ppc_encrypt_aes(u8 *out, const u8 *in, u32 *key_enc,
|
|
* u32 rounds)
|
|
*
|
|
* called from glue layer to encrypt a single 16 byte block
|
|
* round values are AES128 = 4, AES192 = 5, AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_encrypt_aes)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_ENCTAB, 0)
|
|
LOAD_DATA(rD0, 0)
|
|
LOAD_DATA(rD1, 4)
|
|
LOAD_DATA(rD2, 8)
|
|
LOAD_DATA(rD3, 12)
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_encrypt_block
|
|
xor rD0,rD0,rW0
|
|
SAVE_DATA(rD0, 0)
|
|
xor rD1,rD1,rW1
|
|
SAVE_DATA(rD1, 4)
|
|
xor rD2,rD2,rW2
|
|
SAVE_DATA(rD2, 8)
|
|
xor rD3,rD3,rW3
|
|
SAVE_DATA(rD3, 12)
|
|
FINALIZE_CRYPT(0)
|
|
blr
|
|
|
|
/*
|
|
* ppc_decrypt_aes(u8 *out, const u8 *in, u32 *key_dec,
|
|
* u32 rounds)
|
|
*
|
|
* called from glue layer to decrypt a single 16 byte block
|
|
* round values are AES128 = 4, AES192 = 5, AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_decrypt_aes)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_DECTAB,0)
|
|
LOAD_DATA(rD0, 0)
|
|
addi rT1,rT0,4096
|
|
LOAD_DATA(rD1, 4)
|
|
LOAD_DATA(rD2, 8)
|
|
LOAD_DATA(rD3, 12)
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_decrypt_block
|
|
xor rD0,rD0,rW0
|
|
SAVE_DATA(rD0, 0)
|
|
xor rD1,rD1,rW1
|
|
SAVE_DATA(rD1, 4)
|
|
xor rD2,rD2,rW2
|
|
SAVE_DATA(rD2, 8)
|
|
xor rD3,rD3,rW3
|
|
SAVE_DATA(rD3, 12)
|
|
FINALIZE_CRYPT(0)
|
|
blr
|
|
|
|
/*
|
|
* ppc_encrypt_ecb(u8 *out, const u8 *in, u32 *key_enc,
|
|
* u32 rounds, u32 bytes);
|
|
*
|
|
* called from glue layer to encrypt multiple blocks via ECB
|
|
* Bytes must be larger or equal 16 and only whole blocks are
|
|
* processed. round values are AES128 = 4, AES192 = 5 and
|
|
* AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_encrypt_ecb)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_ENCTAB, 0)
|
|
ppc_encrypt_ecb_loop:
|
|
LOAD_DATA(rD0, 0)
|
|
mr rKP,rKS
|
|
LOAD_DATA(rD1, 4)
|
|
subi rLN,rLN,16
|
|
LOAD_DATA(rD2, 8)
|
|
cmpwi rLN,15
|
|
LOAD_DATA(rD3, 12)
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_encrypt_block
|
|
xor rD0,rD0,rW0
|
|
SAVE_DATA(rD0, 0)
|
|
xor rD1,rD1,rW1
|
|
SAVE_DATA(rD1, 4)
|
|
xor rD2,rD2,rW2
|
|
SAVE_DATA(rD2, 8)
|
|
xor rD3,rD3,rW3
|
|
SAVE_DATA(rD3, 12)
|
|
NEXT_BLOCK
|
|
bt gt,ppc_encrypt_ecb_loop
|
|
FINALIZE_CRYPT(0)
|
|
blr
|
|
|
|
/*
|
|
* ppc_decrypt_ecb(u8 *out, const u8 *in, u32 *key_dec,
|
|
* u32 rounds, u32 bytes);
|
|
*
|
|
* called from glue layer to decrypt multiple blocks via ECB
|
|
* Bytes must be larger or equal 16 and only whole blocks are
|
|
* processed. round values are AES128 = 4, AES192 = 5 and
|
|
* AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_decrypt_ecb)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_DECTAB, 0)
|
|
addi rT1,rT0,4096
|
|
ppc_decrypt_ecb_loop:
|
|
LOAD_DATA(rD0, 0)
|
|
mr rKP,rKS
|
|
LOAD_DATA(rD1, 4)
|
|
subi rLN,rLN,16
|
|
LOAD_DATA(rD2, 8)
|
|
cmpwi rLN,15
|
|
LOAD_DATA(rD3, 12)
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_decrypt_block
|
|
xor rD0,rD0,rW0
|
|
SAVE_DATA(rD0, 0)
|
|
xor rD1,rD1,rW1
|
|
SAVE_DATA(rD1, 4)
|
|
xor rD2,rD2,rW2
|
|
SAVE_DATA(rD2, 8)
|
|
xor rD3,rD3,rW3
|
|
SAVE_DATA(rD3, 12)
|
|
NEXT_BLOCK
|
|
bt gt,ppc_decrypt_ecb_loop
|
|
FINALIZE_CRYPT(0)
|
|
blr
|
|
|
|
/*
|
|
* ppc_encrypt_cbc(u8 *out, const u8 *in, u32 *key_enc,
|
|
* 32 rounds, u32 bytes, u8 *iv);
|
|
*
|
|
* called from glue layer to encrypt multiple blocks via CBC
|
|
* Bytes must be larger or equal 16 and only whole blocks are
|
|
* processed. round values are AES128 = 4, AES192 = 5 and
|
|
* AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_encrypt_cbc)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_ENCTAB, 4)
|
|
LOAD_IV(rI0, 0)
|
|
LOAD_IV(rI1, 4)
|
|
LOAD_IV(rI2, 8)
|
|
LOAD_IV(rI3, 12)
|
|
ppc_encrypt_cbc_loop:
|
|
LOAD_DATA(rD0, 0)
|
|
mr rKP,rKS
|
|
LOAD_DATA(rD1, 4)
|
|
subi rLN,rLN,16
|
|
LOAD_DATA(rD2, 8)
|
|
cmpwi rLN,15
|
|
LOAD_DATA(rD3, 12)
|
|
xor rD0,rD0,rI0
|
|
xor rD1,rD1,rI1
|
|
xor rD2,rD2,rI2
|
|
xor rD3,rD3,rI3
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_encrypt_block
|
|
xor rI0,rD0,rW0
|
|
SAVE_DATA(rI0, 0)
|
|
xor rI1,rD1,rW1
|
|
SAVE_DATA(rI1, 4)
|
|
xor rI2,rD2,rW2
|
|
SAVE_DATA(rI2, 8)
|
|
xor rI3,rD3,rW3
|
|
SAVE_DATA(rI3, 12)
|
|
NEXT_BLOCK
|
|
bt gt,ppc_encrypt_cbc_loop
|
|
START_IV
|
|
SAVE_IV(rI0, 0)
|
|
SAVE_IV(rI1, 4)
|
|
SAVE_IV(rI2, 8)
|
|
SAVE_IV(rI3, 12)
|
|
FINALIZE_CRYPT(4)
|
|
blr
|
|
|
|
/*
|
|
* ppc_decrypt_cbc(u8 *out, const u8 *in, u32 *key_dec,
|
|
* u32 rounds, u32 bytes, u8 *iv);
|
|
*
|
|
* called from glue layer to decrypt multiple blocks via CBC
|
|
* round values are AES128 = 4, AES192 = 5, AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_decrypt_cbc)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_DECTAB, 4)
|
|
li rT1,15
|
|
LOAD_IV(rI0, 0)
|
|
andc rLN,rLN,rT1
|
|
LOAD_IV(rI1, 4)
|
|
subi rLN,rLN,16
|
|
LOAD_IV(rI2, 8)
|
|
add rSP,rSP,rLN /* reverse processing */
|
|
LOAD_IV(rI3, 12)
|
|
add rDP,rDP,rLN
|
|
LOAD_DATA(rD0, 0)
|
|
addi rT1,rT0,4096
|
|
LOAD_DATA(rD1, 4)
|
|
LOAD_DATA(rD2, 8)
|
|
LOAD_DATA(rD3, 12)
|
|
START_IV
|
|
SAVE_IV(rD0, 0)
|
|
SAVE_IV(rD1, 4)
|
|
SAVE_IV(rD2, 8)
|
|
cmpwi rLN,16
|
|
SAVE_IV(rD3, 12)
|
|
bt lt,ppc_decrypt_cbc_end
|
|
ppc_decrypt_cbc_loop:
|
|
mr rKP,rKS
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_decrypt_block
|
|
subi rLN,rLN,16
|
|
subi rSP,rSP,CBC_DEC
|
|
xor rW0,rD0,rW0
|
|
LOAD_DATA(rD0, 0)
|
|
xor rW1,rD1,rW1
|
|
LOAD_DATA(rD1, 4)
|
|
xor rW2,rD2,rW2
|
|
LOAD_DATA(rD2, 8)
|
|
xor rW3,rD3,rW3
|
|
LOAD_DATA(rD3, 12)
|
|
xor rW0,rW0,rD0
|
|
SAVE_DATA(rW0, 0)
|
|
xor rW1,rW1,rD1
|
|
SAVE_DATA(rW1, 4)
|
|
xor rW2,rW2,rD2
|
|
SAVE_DATA(rW2, 8)
|
|
xor rW3,rW3,rD3
|
|
SAVE_DATA(rW3, 12)
|
|
cmpwi rLN,15
|
|
subi rDP,rDP,CBC_DEC
|
|
bt gt,ppc_decrypt_cbc_loop
|
|
ppc_decrypt_cbc_end:
|
|
mr rKP,rKS
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_decrypt_block
|
|
xor rW0,rW0,rD0
|
|
xor rW1,rW1,rD1
|
|
xor rW2,rW2,rD2
|
|
xor rW3,rW3,rD3
|
|
xor rW0,rW0,rI0 /* decrypt with initial IV */
|
|
SAVE_DATA(rW0, 0)
|
|
xor rW1,rW1,rI1
|
|
SAVE_DATA(rW1, 4)
|
|
xor rW2,rW2,rI2
|
|
SAVE_DATA(rW2, 8)
|
|
xor rW3,rW3,rI3
|
|
SAVE_DATA(rW3, 12)
|
|
FINALIZE_CRYPT(4)
|
|
blr
|
|
|
|
/*
|
|
* ppc_crypt_ctr(u8 *out, const u8 *in, u32 *key_enc,
|
|
* u32 rounds, u32 bytes, u8 *iv);
|
|
*
|
|
* called from glue layer to encrypt/decrypt multiple blocks
|
|
* via CTR. Number of bytes does not need to be a multiple of
|
|
* 16. Round values are AES128 = 4, AES192 = 5, AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_crypt_ctr)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_ENCTAB, 4)
|
|
LOAD_IV(rI0, 0)
|
|
LOAD_IV(rI1, 4)
|
|
LOAD_IV(rI2, 8)
|
|
cmpwi rLN,16
|
|
LOAD_IV(rI3, 12)
|
|
START_IV
|
|
bt lt,ppc_crypt_ctr_partial
|
|
ppc_crypt_ctr_loop:
|
|
mr rKP,rKS
|
|
START_KEY(rI0, rI1, rI2, rI3)
|
|
bl ppc_encrypt_block
|
|
xor rW0,rD0,rW0
|
|
xor rW1,rD1,rW1
|
|
xor rW2,rD2,rW2
|
|
xor rW3,rD3,rW3
|
|
LOAD_DATA(rD0, 0)
|
|
subi rLN,rLN,16
|
|
LOAD_DATA(rD1, 4)
|
|
LOAD_DATA(rD2, 8)
|
|
LOAD_DATA(rD3, 12)
|
|
xor rD0,rD0,rW0
|
|
SAVE_DATA(rD0, 0)
|
|
xor rD1,rD1,rW1
|
|
SAVE_DATA(rD1, 4)
|
|
xor rD2,rD2,rW2
|
|
SAVE_DATA(rD2, 8)
|
|
xor rD3,rD3,rW3
|
|
SAVE_DATA(rD3, 12)
|
|
addic rI3,rI3,1 /* increase counter */
|
|
addze rI2,rI2
|
|
addze rI1,rI1
|
|
addze rI0,rI0
|
|
NEXT_BLOCK
|
|
cmpwi rLN,15
|
|
bt gt,ppc_crypt_ctr_loop
|
|
ppc_crypt_ctr_partial:
|
|
cmpwi rLN,0
|
|
bt eq,ppc_crypt_ctr_end
|
|
mr rKP,rKS
|
|
START_KEY(rI0, rI1, rI2, rI3)
|
|
bl ppc_encrypt_block
|
|
xor rW0,rD0,rW0
|
|
SAVE_IV(rW0, 0)
|
|
xor rW1,rD1,rW1
|
|
SAVE_IV(rW1, 4)
|
|
xor rW2,rD2,rW2
|
|
SAVE_IV(rW2, 8)
|
|
xor rW3,rD3,rW3
|
|
SAVE_IV(rW3, 12)
|
|
mtctr rLN
|
|
subi rIP,rIP,CTR_DEC
|
|
subi rSP,rSP,1
|
|
subi rDP,rDP,1
|
|
ppc_crypt_ctr_xorbyte:
|
|
lbzu rW4,1(rIP) /* bytewise xor for partial block */
|
|
lbzu rW5,1(rSP)
|
|
xor rW4,rW4,rW5
|
|
stbu rW4,1(rDP)
|
|
bdnz ppc_crypt_ctr_xorbyte
|
|
subf rIP,rLN,rIP
|
|
addi rIP,rIP,1
|
|
addic rI3,rI3,1
|
|
addze rI2,rI2
|
|
addze rI1,rI1
|
|
addze rI0,rI0
|
|
ppc_crypt_ctr_end:
|
|
SAVE_IV(rI0, 0)
|
|
SAVE_IV(rI1, 4)
|
|
SAVE_IV(rI2, 8)
|
|
SAVE_IV(rI3, 12)
|
|
FINALIZE_CRYPT(4)
|
|
blr
|
|
|
|
/*
|
|
* ppc_encrypt_xts(u8 *out, const u8 *in, u32 *key_enc,
|
|
* u32 rounds, u32 bytes, u8 *iv, u32 *key_twk);
|
|
*
|
|
* called from glue layer to encrypt multiple blocks via XTS
|
|
* If key_twk is given, the initial IV encryption will be
|
|
* processed too. Round values are AES128 = 4, AES192 = 5,
|
|
* AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_encrypt_xts)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_ENCTAB, 8)
|
|
LOAD_IV(rI0, 0)
|
|
LOAD_IV(rI1, 4)
|
|
LOAD_IV(rI2, 8)
|
|
cmpwi rKT,0
|
|
LOAD_IV(rI3, 12)
|
|
bt eq,ppc_encrypt_xts_notweak
|
|
mr rKP,rKT
|
|
START_KEY(rI0, rI1, rI2, rI3)
|
|
bl ppc_encrypt_block
|
|
xor rI0,rD0,rW0
|
|
xor rI1,rD1,rW1
|
|
xor rI2,rD2,rW2
|
|
xor rI3,rD3,rW3
|
|
ppc_encrypt_xts_notweak:
|
|
ENDIAN_SWAP(rG0, rG1, rI0, rI1)
|
|
ENDIAN_SWAP(rG2, rG3, rI2, rI3)
|
|
ppc_encrypt_xts_loop:
|
|
LOAD_DATA(rD0, 0)
|
|
mr rKP,rKS
|
|
LOAD_DATA(rD1, 4)
|
|
subi rLN,rLN,16
|
|
LOAD_DATA(rD2, 8)
|
|
LOAD_DATA(rD3, 12)
|
|
xor rD0,rD0,rI0
|
|
xor rD1,rD1,rI1
|
|
xor rD2,rD2,rI2
|
|
xor rD3,rD3,rI3
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_encrypt_block
|
|
xor rD0,rD0,rW0
|
|
xor rD1,rD1,rW1
|
|
xor rD2,rD2,rW2
|
|
xor rD3,rD3,rW3
|
|
xor rD0,rD0,rI0
|
|
SAVE_DATA(rD0, 0)
|
|
xor rD1,rD1,rI1
|
|
SAVE_DATA(rD1, 4)
|
|
xor rD2,rD2,rI2
|
|
SAVE_DATA(rD2, 8)
|
|
xor rD3,rD3,rI3
|
|
SAVE_DATA(rD3, 12)
|
|
GF128_MUL(rG0, rG1, rG2, rG3, rW0)
|
|
ENDIAN_SWAP(rI0, rI1, rG0, rG1)
|
|
ENDIAN_SWAP(rI2, rI3, rG2, rG3)
|
|
cmpwi rLN,0
|
|
NEXT_BLOCK
|
|
bt gt,ppc_encrypt_xts_loop
|
|
START_IV
|
|
SAVE_IV(rI0, 0)
|
|
SAVE_IV(rI1, 4)
|
|
SAVE_IV(rI2, 8)
|
|
SAVE_IV(rI3, 12)
|
|
FINALIZE_CRYPT(8)
|
|
blr
|
|
|
|
/*
|
|
* ppc_decrypt_xts(u8 *out, const u8 *in, u32 *key_dec,
|
|
* u32 rounds, u32 blocks, u8 *iv, u32 *key_twk);
|
|
*
|
|
* called from glue layer to decrypt multiple blocks via XTS
|
|
* If key_twk is given, the initial IV encryption will be
|
|
* processed too. Round values are AES128 = 4, AES192 = 5,
|
|
* AES256 = 6
|
|
*
|
|
*/
|
|
_GLOBAL(ppc_decrypt_xts)
|
|
INITIALIZE_CRYPT(PPC_AES_4K_DECTAB, 8)
|
|
LOAD_IV(rI0, 0)
|
|
addi rT1,rT0,4096
|
|
LOAD_IV(rI1, 4)
|
|
LOAD_IV(rI2, 8)
|
|
cmpwi rKT,0
|
|
LOAD_IV(rI3, 12)
|
|
bt eq,ppc_decrypt_xts_notweak
|
|
subi rT0,rT0,4096
|
|
mr rKP,rKT
|
|
START_KEY(rI0, rI1, rI2, rI3)
|
|
bl ppc_encrypt_block
|
|
xor rI0,rD0,rW0
|
|
xor rI1,rD1,rW1
|
|
xor rI2,rD2,rW2
|
|
xor rI3,rD3,rW3
|
|
addi rT0,rT0,4096
|
|
ppc_decrypt_xts_notweak:
|
|
ENDIAN_SWAP(rG0, rG1, rI0, rI1)
|
|
ENDIAN_SWAP(rG2, rG3, rI2, rI3)
|
|
ppc_decrypt_xts_loop:
|
|
LOAD_DATA(rD0, 0)
|
|
mr rKP,rKS
|
|
LOAD_DATA(rD1, 4)
|
|
subi rLN,rLN,16
|
|
LOAD_DATA(rD2, 8)
|
|
LOAD_DATA(rD3, 12)
|
|
xor rD0,rD0,rI0
|
|
xor rD1,rD1,rI1
|
|
xor rD2,rD2,rI2
|
|
xor rD3,rD3,rI3
|
|
START_KEY(rD0, rD1, rD2, rD3)
|
|
bl ppc_decrypt_block
|
|
xor rD0,rD0,rW0
|
|
xor rD1,rD1,rW1
|
|
xor rD2,rD2,rW2
|
|
xor rD3,rD3,rW3
|
|
xor rD0,rD0,rI0
|
|
SAVE_DATA(rD0, 0)
|
|
xor rD1,rD1,rI1
|
|
SAVE_DATA(rD1, 4)
|
|
xor rD2,rD2,rI2
|
|
SAVE_DATA(rD2, 8)
|
|
xor rD3,rD3,rI3
|
|
SAVE_DATA(rD3, 12)
|
|
GF128_MUL(rG0, rG1, rG2, rG3, rW0)
|
|
ENDIAN_SWAP(rI0, rI1, rG0, rG1)
|
|
ENDIAN_SWAP(rI2, rI3, rG2, rG3)
|
|
cmpwi rLN,0
|
|
NEXT_BLOCK
|
|
bt gt,ppc_decrypt_xts_loop
|
|
START_IV
|
|
SAVE_IV(rI0, 0)
|
|
SAVE_IV(rI1, 4)
|
|
SAVE_IV(rI2, 8)
|
|
SAVE_IV(rI3, 12)
|
|
FINALIZE_CRYPT(8)
|
|
blr
|