| /* 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 |
