Text file src/crypto/aes/asm_ppc64le.s

Documentation: crypto/aes

     1// Copyright 2016 The Go Authors. All rights reserved.
     2// Use of this source code is governed by a BSD-style
     3// license that can be found in the LICENSE file.
     4
     5// Based on CRYPTOGAMS code with the following comment:
     6// # ====================================================================
     7// # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
     8// # project. The module is, however, dual licensed under OpenSSL and
     9// # CRYPTOGAMS licenses depending on where you obtain it. For further
    10// # details see http://www.openssl.org/~appro/cryptogams/.
    11// # ====================================================================
    12
    13// Original code can be found at the link below:
    14// https://github.com/dot-asm/cryptogams/blob/master/ppc/aesp8-ppc.pl
    15
    16// I changed some function names in order to be more likely to go standards.
    17// For instance, function aes_p8_set_{en,de}crypt_key become
    18// set{En,De}cryptKeyAsm. I also split setEncryptKeyAsm in two parts
    19// and a new session was created (doEncryptKeyAsm). This was necessary to
    20// avoid arguments overwriting when setDecryptKeyAsm calls setEncryptKeyAsm.
    21// There were other modifications as well but kept the same functionality.
    22
    23#include "textflag.h"
    24
    25// For set{En,De}cryptKeyAsm
    26#define INP     R3
    27#define BITS    R4
    28#define OUT     R5
    29#define PTR     R6
    30#define CNT     R7
    31#define ROUNDS  R8
    32#define TEMP    R19
    33#define ZERO    V0
    34#define IN0     V1
    35#define IN1     V2
    36#define KEY     V3
    37#define RCON    V4
    38#define MASK    V5
    39#define TMP     V6
    40#define STAGE   V7
    41#define OUTPERM V8
    42#define OUTMASK V9
    43#define OUTHEAD V10
    44#define OUTTAIL V11
    45
    46// For {en,de}cryptBlockAsm
    47#define BLK_INP    R3
    48#define BLK_OUT    R4
    49#define BLK_KEY    R5
    50#define BLK_ROUNDS R6
    51#define BLK_IDX    R7
    52
    53DATA  ·rcon+0x00(SB)/8, $0x0100000001000000 // RCON
    54DATA  ·rcon+0x08(SB)/8, $0x0100000001000000 // RCON
    55DATA  ·rcon+0x10(SB)/8, $0x1b0000001b000000
    56DATA  ·rcon+0x18(SB)/8, $0x1b0000001b000000
    57DATA  ·rcon+0x20(SB)/8, $0x0d0e0f0c0d0e0f0c // MASK
    58DATA  ·rcon+0x28(SB)/8, $0x0d0e0f0c0d0e0f0c // MASK
    59DATA  ·rcon+0x30(SB)/8, $0x0000000000000000
    60DATA  ·rcon+0x38(SB)/8, $0x0000000000000000
    61GLOBL ·rcon(SB), RODATA, $64
    62
    63// func setEncryptKeyAsm(key *byte, keylen int, enc *uint32) int
    64TEXT ·setEncryptKeyAsm(SB),NOSPLIT|NOFRAME,$0
    65	// Load the arguments inside the registers
    66	MOVD key+0(FP), INP
    67	MOVD keylen+8(FP), BITS
    68	MOVD enc+16(FP), OUT
    69	JMP ·doEncryptKeyAsm(SB)
    70
    71// This text is used both setEncryptKeyAsm and setDecryptKeyAsm
    72TEXT ·doEncryptKeyAsm(SB),NOSPLIT|NOFRAME,$0
    73	// Do not change R10 since it's storing the LR value in setDecryptKeyAsm
    74
    75	// Check arguments
    76	MOVD $-1, PTR                  // li    6,-1       exit code to -1 (255)
    77	CMPU INP, $0                   // cmpldi r3,0      input key pointer set?
    78	BC 0x0E, 2, enc_key_abort      // beq-  .Lenc_key_abort
    79	CMPU OUT, $0                   // cmpldi r5,0      output key pointer set?
    80	BC 0x0E, 2, enc_key_abort      // beq-  .Lenc_key_abort
    81	MOVD $-2, PTR                  // li    6,-2       exit code to -2 (254)
    82	CMPW BITS, $128                // cmpwi 4,128      greater or equal to 128
    83	BC 0x0E, 0, enc_key_abort      // blt-  .Lenc_key_abort
    84	CMPW BITS, $256                // cmpwi 4,256      lesser or equal to 256
    85	BC 0x0E, 1, enc_key_abort      // bgt-  .Lenc_key_abort
    86	ANDCC $0x3f, BITS, TEMP        // andi. 0,4,0x3f   multiple of 64
    87	BC 0x06, 2, enc_key_abort      // bne-  .Lenc_key_abort
    88
    89	MOVD $·rcon(SB), PTR           // PTR point to rcon addr
    90
    91	// Get key from memory and write aligned into VR
    92	NEG INP, R9                    // neg   9,3        R9 is ~INP + 1
    93	LVX (INP)(R0), IN0             // lvx   1,0,3      Load key inside IN0
    94	ADD $15, INP, INP              // addi  3,3,15     Add 15B to INP addr
    95	LVSR (R9)(R0), KEY             // lvsr  3,0,9
    96	MOVD $0x20, R8                 // li    8,0x20     R8 = 32
    97	CMPW BITS, $192                // cmpwi 4,192      Key size == 192?
    98	LVX (INP)(R0), IN1             // lvx   2,0,3
    99	VSPLTISB $0x0f, MASK           // vspltisb 5,0x0f  0x0f0f0f0f... mask
   100	LVX (PTR)(R0), RCON            // lvx   4,0,6      Load first 16 bytes into RCON
   101	VXOR KEY, MASK, KEY            // vxor  3,3,5      Adjust for byte swap
   102	LVX (PTR)(R8), MASK            // lvx   5,8,6
   103	ADD $0x10, PTR, PTR            // addi  6,6,0x10   PTR to next 16 bytes of RCON
   104	VPERM IN0, IN1, KEY, IN0       // vperm 1,1,2,3    Align
   105	MOVD $8, CNT                   // li    7,8        CNT = 8
   106	VXOR ZERO, ZERO, ZERO          // vxor  0,0,0      Zero to be zero :)
   107	MOVD CNT, CTR                  // mtctr 7          Set the counter to 8 (rounds)
   108
   109	LVSL (OUT)(R0), OUTPERM        // lvsl  8,0,5
   110	VSPLTISB $-1, OUTMASK          // vspltisb      9,-1
   111	LVX (OUT)(R0), OUTHEAD         // lvx   10,0,5
   112	VPERM OUTMASK, ZERO, OUTPERM, OUTMASK  // vperm 9,9,0,8
   113
   114	BLT loop128                    // blt   .Loop128
   115	ADD $8, INP, INP               // addi  3,3,8
   116	BEQ l192                       // beq   .L192
   117	ADD $8, INP, INP               // addi  3,3,8
   118	JMP l256                       // b     .L256
   119
   120loop128:
   121	// Key schedule (Round 1 to 8)
   122	VPERM IN0, IN0, MASK, KEY      // vperm 3,1,1,5         Rotate-n-splat
   123	VSLDOI $12, ZERO, IN0, TMP     // vsldoi 6,0,1,12
   124	VPERM IN0, IN0, OUTPERM, OUTTAIL // vperm 11,1,1,8    Rotate
   125	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   126	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   127	VCIPHERLAST KEY, RCON, KEY     // vcipherlast 3,3,4
   128	STVX STAGE, (OUT+R0)           // stvx 7,0,5        Write to output
   129	ADD $16, OUT, OUT              // addi 5,5,16       Point to the next round
   130
   131	VXOR IN0, TMP, IN0             // vxor 1,1,6
   132	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   133	VXOR IN0, TMP, IN0             // vxor 1,1,6
   134	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   135	VXOR IN0, TMP, IN0             // vxor 1,1,6
   136	VADDUWM RCON, RCON, RCON       // vadduwm 4,4,4
   137	VXOR IN0, KEY, IN0             // vxor 1,1,3
   138	BC 0x10, 0, loop128            // bdnz .Loop128
   139
   140	LVX (PTR)(R0), RCON            // lvx 4,0,6     Last two round keys
   141
   142	// Key schedule (Round 9)
   143	VPERM IN0, IN0, MASK, KEY      // vperm 3,1,1,5   Rotate-n-spat
   144	VSLDOI $12, ZERO, IN0, TMP     // vsldoi 6,0,1,12
   145	VPERM IN0, IN0, OUTPERM, OUTTAIL // vperm 11,1,1,8  Rotate
   146	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   147	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   148	VCIPHERLAST KEY, RCON, KEY     // vcipherlast 3,3,4
   149	STVX STAGE, (OUT+R0)           // stvx 7,0,5   Round 9
   150	ADD $16, OUT, OUT              // addi 5,5,16
   151
   152	// Key schedule (Round 10)
   153	VXOR IN0, TMP, IN0             // vxor 1,1,6
   154	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   155	VXOR IN0, TMP, IN0             // vxor 1,1,6
   156	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   157	VXOR IN0, TMP, IN0             // vxor 1,1,6
   158	VADDUWM RCON, RCON, RCON       // vadduwm 4,4,4
   159	VXOR IN0, KEY, IN0             // vxor 1,1,3
   160
   161	VPERM IN0, IN0, MASK, KEY      // vperm 3,1,1,5   Rotate-n-splat
   162	VSLDOI $12, ZERO, IN0, TMP     // vsldoi 6,0,1,12
   163	VPERM IN0, IN0, OUTPERM, OUTTAIL // vperm 11,1,1,8  Rotate
   164	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   165	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   166	VCIPHERLAST KEY, RCON, KEY     // vcipherlast 3,3,4
   167	STVX STAGE, (OUT+R0)           // stvx 7,0,5    Round 10
   168	ADD $16, OUT, OUT              // addi 5,5,16
   169
   170	// Key schedule (Round 11)
   171	VXOR IN0, TMP, IN0             // vxor 1,1,6
   172	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   173	VXOR IN0, TMP, IN0             // vxor 1,1,6
   174	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   175	VXOR IN0, TMP, IN0             // vxor 1,1,6
   176	VXOR IN0, KEY, IN0             // vxor 1,1,3
   177	VPERM IN0, IN0, OUTPERM, OUTTAIL // vperm 11,1,1,8
   178	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   179	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   180	STVX STAGE, (OUT+R0)           // stvx 7,0,5  Round 11
   181
   182	ADD $15, OUT, INP              // addi  3,5,15
   183	ADD $0x50, OUT, OUT            // addi  5,5,0x50
   184
   185	MOVD $10, ROUNDS               // li    8,10
   186	JMP done                       // b     .Ldone
   187
   188l192:
   189	LVX (INP)(R0), TMP             // lvx 6,0,3
   190	MOVD $4, CNT                   // li 7,4
   191	VPERM IN0, IN0, OUTPERM, OUTTAIL // vperm 11,1,1,8
   192	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   193	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   194	STVX STAGE, (OUT+R0)           // stvx 7,0,5
   195	ADD $16, OUT, OUT              // addi 5,5,16
   196	VPERM IN1, TMP, KEY, IN1       // vperm 2,2,6,3
   197	VSPLTISB $8, KEY               // vspltisb 3,8
   198	MOVD CNT, CTR                  // mtctr 7
   199	VSUBUBM MASK, KEY, MASK        // vsububm 5,5,3
   200
   201loop192:
   202	VPERM IN1, IN1, MASK, KEY      // vperm 3,2,2,5
   203	VSLDOI $12, ZERO, IN0, TMP     // vsldoi 6,0,1,12
   204	VCIPHERLAST KEY, RCON, KEY     // vcipherlast 3,3,4
   205
   206	VXOR IN0, TMP, IN0             // vxor 1,1,6
   207	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   208	VXOR IN0, TMP, IN0             // vxor 1,1,6
   209	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   210	VXOR IN0, TMP, IN0             // vxor 1,1,6
   211
   212	VSLDOI $8, ZERO, IN1, STAGE    // vsldoi 7,0,2,8
   213	VSPLTW $3, IN0, TMP            // vspltw 6,1,3
   214	VXOR TMP, IN1, TMP             // vxor 6,6,2
   215	VSLDOI $12, ZERO, IN1, IN1     // vsldoi 2,0,2,12
   216	VADDUWM RCON, RCON, RCON       // vadduwm 4,4,4
   217	VXOR IN1, TMP, IN1             // vxor 2,2,6
   218	VXOR IN0, KEY, IN0             // vxor 1,1,3
   219	VXOR IN1, KEY, IN1             // vxor 2,2,3
   220	VSLDOI $8, STAGE, IN0, STAGE   // vsldoi 7,7,1,8
   221
   222	VPERM IN1, IN1, MASK, KEY      // vperm 3,2,2,5
   223	VSLDOI $12, ZERO, IN0, TMP     // vsldoi 6,0,1,12
   224	VPERM STAGE, STAGE, OUTPERM, OUTTAIL // vperm 11,7,7,8
   225	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   226	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   227	VCIPHERLAST KEY, RCON, KEY     // vcipherlast 3,3,4
   228	STVX STAGE, (OUT+R0)           // stvx 7,0,5
   229	ADD $16, OUT, OUT              // addi 5,5,16
   230
   231	VSLDOI $8, IN0, IN1, STAGE     // vsldoi 7,1,2,8
   232	VXOR IN0, TMP, IN0             // vxor 1,1,6
   233	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   234	VPERM STAGE, STAGE, OUTPERM, OUTTAIL // vperm 11,7,7,8
   235	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   236	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   237	VXOR IN0, TMP, IN0             // vxor 1,1,6
   238	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   239	VXOR IN0, TMP, IN0             // vxor 1,1,6
   240	STVX STAGE, (OUT+R0)           // stvx 7,0,5
   241	ADD $16, OUT, OUT              // addi 5,5,16
   242
   243	VSPLTW $3, IN0, TMP            // vspltw 6,1,3
   244	VXOR TMP, IN1, TMP             // vxor 6,6,2
   245	VSLDOI $12, ZERO, IN1, IN1     // vsldoi 2,0,2,12
   246	VADDUWM RCON, RCON, RCON       // vadduwm 4,4,4
   247	VXOR IN1, TMP, IN1             // vxor 2,2,6
   248	VXOR IN0, KEY, IN0             // vxor 1,1,3
   249	VXOR IN1, KEY, IN1             // vxor 2,2,3
   250	VPERM IN0, IN0, OUTPERM, OUTTAIL // vperm 11,1,1,8
   251	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   252	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   253	STVX STAGE, (OUT+R0)           // stvx 7,0,5
   254	ADD $15, OUT, INP              // addi 3,5,15
   255	ADD $16, OUT, OUT              // addi 5,5,16
   256	BC 0x10, 0, loop192           // bdnz .Loop192
   257
   258	MOVD $12, ROUNDS               // li 8,12
   259	ADD $0x20, OUT, OUT            // addi 5,5,0x20
   260	JMP done                       // b .Ldone
   261
   262l256:
   263	LVX (INP)(R0), TMP             // lvx 6,0,3
   264	MOVD $7, CNT                   // li 7,7
   265	MOVD $14, ROUNDS               // li 8,14
   266	VPERM IN0, IN0, OUTPERM, OUTTAIL // vperm 11,1,1,8
   267	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   268	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   269	STVX STAGE, (OUT+R0)           // stvx 7,0,5
   270	ADD $16, OUT, OUT              // addi 5,5,16
   271	VPERM IN1, TMP, KEY, IN1       // vperm 2,2,6,3
   272	MOVD CNT, CTR                  // mtctr 7
   273
   274loop256:
   275	VPERM IN1, IN1, MASK, KEY      // vperm 3,2,2,5
   276	VSLDOI $12, ZERO, IN0, TMP     // vsldoi 6,0,1,12
   277	VPERM IN1, IN1, OUTPERM, OUTTAIL // vperm 11,2,2,8
   278	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   279	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   280	VCIPHERLAST KEY, RCON, KEY     // vcipherlast 3,3,4
   281	STVX STAGE, (OUT+R0)           // stvx 7,0,5
   282	ADD $16, OUT, OUT              // addi 5,5,16
   283
   284	VXOR IN0, TMP, IN0             // vxor 1,1,6
   285	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   286	VXOR IN0, TMP, IN0             // vxor 1,1,6
   287	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   288	VXOR IN0, TMP, IN0             // vxor 1,1,6
   289	VADDUWM RCON, RCON, RCON       // vadduwm 4,4,4
   290	VXOR IN0, KEY, IN0             // vxor 1,1,3
   291	VPERM IN0, IN0, OUTPERM, OUTTAIL // vperm 11,1,1,8
   292	VSEL OUTHEAD, OUTTAIL, OUTMASK, STAGE // vsel 7,10,11,9
   293	VOR OUTTAIL, OUTTAIL, OUTHEAD  // vor 10,11,11
   294	STVX STAGE, (OUT+R0)           // stvx 7,0,5
   295	ADD $15, OUT, INP              // addi 3,5,15
   296	ADD $16, OUT, OUT              // addi 5,5,16
   297	BC 0x12, 0, done               // bdz .Ldone
   298
   299	VSPLTW $3, IN0, KEY            // vspltw 3,1,3
   300	VSLDOI $12, ZERO, IN1, TMP     // vsldoi 6,0,2,12
   301	VSBOX KEY, KEY                 // vsbox 3,3
   302
   303	VXOR IN1, TMP, IN1             // vxor 2,2,6
   304	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   305	VXOR IN1, TMP, IN1             // vxor 2,2,6
   306	VSLDOI $12, ZERO, TMP, TMP     // vsldoi 6,0,6,12
   307	VXOR IN1, TMP, IN1             // vxor 2,2,6
   308
   309	VXOR IN1, KEY, IN1             // vxor 2,2,3
   310	JMP loop256                    // b .Loop256
   311
   312done:
   313	LVX (INP)(R0), IN1             // lvx   2,0,3
   314	VSEL OUTHEAD, IN1, OUTMASK, IN1 // vsel 2,10,2,9
   315	STVX IN1, (INP+R0)             // stvx  2,0,3
   316	MOVD $0, PTR                   // li    6,0    set PTR to 0 (exit code 0)
   317	MOVW ROUNDS, 0(OUT)            // stw   8,0(5)
   318
   319enc_key_abort:
   320	MOVD PTR, INP                  // mr    3,6    set exit code with PTR value
   321	MOVD INP, ret+24(FP)           // Put return value into the FP
   322	RET                            // blr
   323
   324// func setDecryptKeyAsm(key *byte, keylen int, dec *uint32) int
   325TEXT ·setDecryptKeyAsm(SB),NOSPLIT|NOFRAME,$0
   326	// Load the arguments inside the registers
   327	MOVD key+0(FP), INP
   328	MOVD keylen+8(FP), BITS
   329	MOVD dec+16(FP), OUT
   330
   331	MOVD LR, R10                   // mflr 10
   332	CALL ·doEncryptKeyAsm(SB)
   333	MOVD R10, LR                   // mtlr 10
   334
   335	CMPW INP, $0                   // cmpwi 3,0  exit 0 = ok
   336	BC 0x06, 2, dec_key_abort      // bne- .Ldec_key_abort
   337
   338	// doEncryptKeyAsm set ROUNDS (R8) with the proper value for each mode
   339	SLW $4, ROUNDS, CNT            // slwi 7,8,4
   340	SUB $240, OUT, INP             // subi 3,5,240
   341	SRW $1, ROUNDS, ROUNDS         // srwi 8,8,1
   342	ADD R7, INP, OUT               // add 5,3,7
   343	MOVD ROUNDS, CTR               // mtctr 8
   344
   345// dec_key will invert the key sequence in order to be used for decrypt
   346dec_key:
   347	MOVWZ 0(INP), TEMP             // lwz 0, 0(3)
   348	MOVWZ 4(INP), R6               // lwz 6, 4(3)
   349	MOVWZ 8(INP), R7               // lwz 7, 8(3)
   350	MOVWZ 12(INP), R8              // lwz 8, 12(3)
   351	ADD $16, INP, INP              // addi 3,3,16
   352	MOVWZ 0(OUT), R9               // lwz 9, 0(5)
   353	MOVWZ 4(OUT), R10              // lwz 10,4(5)
   354	MOVWZ 8(OUT), R11              // lwz 11,8(5)
   355	MOVWZ 12(OUT), R12             // lwz 12,12(5)
   356	MOVW TEMP, 0(OUT)              // stw 0, 0(5)
   357	MOVW R6, 4(OUT)                // stw 6, 4(5)
   358	MOVW R7, 8(OUT)                // stw 7, 8(5)
   359	MOVW R8, 12(OUT)               // stw 8, 12(5)
   360	SUB $16, OUT, OUT              // subi 5,5,16
   361	MOVW R9, -16(INP)              // stw 9, -16(3)
   362	MOVW R10, -12(INP)             // stw 10,-12(3)
   363	MOVW R11, -8(INP)              // stw 11,-8(3)
   364	MOVW R12, -4(INP)              // stw 12,-4(3)
   365	BC 0x10, 0, dec_key            // bdnz .Ldeckey
   366
   367	XOR R3, R3, R3                 // xor 3,3,3      Clean R3
   368
   369dec_key_abort:
   370	MOVD R3, ret+24(FP)            // Put return value into the FP
   371	RET                            // blr
   372
   373
   374// func encryptBlockAsm(dst, src *byte, enc *uint32)
   375TEXT ·encryptBlockAsm(SB),NOSPLIT|NOFRAME,$0
   376	// Load the arguments inside the registers
   377	MOVD dst+0(FP), BLK_OUT
   378	MOVD src+8(FP), BLK_INP
   379	MOVD enc+16(FP), BLK_KEY
   380
   381	MOVWZ 240(BLK_KEY), BLK_ROUNDS // lwz 6,240(5)
   382	MOVD $15, BLK_IDX              // li 7,15
   383
   384	LVX (BLK_INP)(R0), ZERO        // lvx 0,0,3
   385	NEG BLK_OUT, R11               // neg 11,4
   386	LVX (BLK_INP)(BLK_IDX), IN0    // lvx 1,7,3
   387	LVSL (BLK_INP)(R0), IN1        // lvsl 2,0,3
   388	VSPLTISB $0x0f, RCON           // vspltisb 4,0x0f
   389	LVSR (R11)(R0), KEY            // lvsr 3,0,11
   390	VXOR IN1, RCON, IN1            // vxor 2,2,4
   391	MOVD $16, BLK_IDX              // li 7,16
   392	VPERM ZERO, IN0, IN1, ZERO     // vperm 0,0,1,2
   393	LVX (BLK_KEY)(R0), IN0         // lvx 1,0,5
   394	LVSR (BLK_KEY)(R0), MASK       // lvsr 5,0,5
   395	SRW $1, BLK_ROUNDS, BLK_ROUNDS // srwi 6,6,1
   396	LVX (BLK_KEY)(BLK_IDX), IN1    // lvx 2,7,5
   397	ADD $16, BLK_IDX, BLK_IDX      // addi 7,7,16
   398	SUB $1, BLK_ROUNDS, BLK_ROUNDS // subi 6,6,1
   399	VPERM IN1, IN0, MASK, IN0      // vperm 1,2,1,5
   400
   401	VXOR ZERO, IN0, ZERO           // vxor 0,0,1
   402	LVX (BLK_KEY)(BLK_IDX), IN0    // lvx 1,7,5
   403	ADD $16, BLK_IDX, BLK_IDX      // addi 7,7,16
   404	MOVD BLK_ROUNDS, CTR           // mtctr 6
   405
   406loop_enc:
   407	VPERM IN0, IN1, MASK, IN1      // vperm 2,1,2,5
   408	VCIPHER ZERO, IN1, ZERO        // vcipher 0,0,2
   409	LVX (BLK_KEY)(BLK_IDX), IN1    // lvx 2,7,5
   410	ADD $16, BLK_IDX, BLK_IDX      // addi 7,7,16
   411	VPERM IN1, IN0, MASK, IN0      // vperm 1,2,1,5
   412	VCIPHER ZERO, IN0, ZERO        // vcipher 0,0,1
   413	LVX (BLK_KEY)(BLK_IDX), IN0    // lvx 1,7,5
   414	ADD $16, BLK_IDX, BLK_IDX      // addi 7,7,16
   415	BC 0x10, 0, loop_enc           // bdnz .Loop_enc
   416
   417	VPERM IN0, IN1, MASK, IN1      // vperm 2,1,2,5
   418	VCIPHER ZERO, IN1, ZERO        // vcipher 0,0,2
   419	LVX (BLK_KEY)(BLK_IDX), IN1    // lvx 2,7,5
   420	VPERM IN1, IN0, MASK, IN0      // vperm 1,2,1,5
   421	VCIPHERLAST ZERO, IN0, ZERO    // vcipherlast 0,0,1
   422
   423	VSPLTISB $-1, IN1              // vspltisb 2,-1
   424	VXOR IN0, IN0, IN0             // vxor 1,1,1
   425	MOVD $15, BLK_IDX              // li 7,15
   426	VPERM IN1, IN0, KEY, IN1       // vperm 2,2,1,3
   427	VXOR KEY, RCON, KEY            // vxor 3,3,4
   428	LVX (BLK_OUT)(R0), IN0         // lvx 1,0,4
   429	VPERM ZERO, ZERO, KEY, ZERO    // vperm 0,0,0,3
   430	VSEL IN0, ZERO, IN1, IN0       // vsel 1,1,0,2
   431	LVX (BLK_OUT)(BLK_IDX), RCON   // lvx 4,7,4
   432	STVX IN0, (BLK_OUT+R0)         // stvx 1,0,4
   433	VSEL ZERO, RCON, IN1, ZERO     // vsel 0,0,4,2
   434	STVX ZERO, (BLK_OUT+BLK_IDX)   // stvx 0,7,4
   435
   436	RET                            // blr
   437
   438
   439// func decryptBlockAsm(dst, src *byte, dec *uint32)
   440TEXT ·decryptBlockAsm(SB),NOSPLIT|NOFRAME,$0
   441	// Load the arguments inside the registers
   442	MOVD dst+0(FP), BLK_OUT
   443	MOVD src+8(FP), BLK_INP
   444	MOVD dec+16(FP), BLK_KEY
   445
   446	MOVWZ 240(BLK_KEY), BLK_ROUNDS // lwz 6,240(5)
   447	MOVD $15, BLK_IDX              // li 7,15
   448
   449	LVX (BLK_INP)(R0), ZERO        // lvx 0,0,3
   450	NEG BLK_OUT, R11               // neg 11,4
   451	LVX (BLK_INP)(BLK_IDX), IN0    // lvx 1,7,3
   452	LVSL (BLK_INP)(R0), IN1        // lvsl 2,0,3
   453	VSPLTISB $0x0f, RCON           // vspltisb 4,0x0f
   454	LVSR (R11)(R0), KEY            // lvsr 3,0,11
   455	VXOR IN1, RCON, IN1            // vxor 2,2,4
   456	MOVD $16, BLK_IDX              // li 7,16
   457	VPERM ZERO, IN0, IN1, ZERO     // vperm 0,0,1,2
   458	LVX (BLK_KEY)(R0), IN0         // lvx 1,0,5
   459	LVSR (BLK_KEY)(R0), MASK       // lvsr 5,0,5
   460	SRW $1, BLK_ROUNDS, BLK_ROUNDS // srwi 6,6,1
   461	LVX (BLK_KEY)(BLK_IDX), IN1    // lvx 2,7,5
   462	ADD $16, BLK_IDX, BLK_IDX      // addi 7,7,16
   463	SUB $1, BLK_ROUNDS, BLK_ROUNDS // subi 6,6,1
   464	VPERM IN1, IN0, MASK, IN0      // vperm 1,2,1,5
   465
   466	VXOR ZERO, IN0, ZERO           // vxor 0,0,1
   467	LVX (BLK_KEY)(BLK_IDX), IN0    // lvx 1,7,5
   468	ADD $16, BLK_IDX, BLK_IDX      // addi 7,7,16
   469	MOVD BLK_ROUNDS, CTR           // mtctr 6
   470
   471loop_dec:
   472	VPERM IN0, IN1, MASK, IN1      // vperm 2,1,2,5
   473	VNCIPHER ZERO, IN1, ZERO       // vncipher 0,0,2
   474	LVX (BLK_KEY)(BLK_IDX), IN1    // lvx 2,7,5
   475	ADD $16, BLK_IDX, BLK_IDX      // addi 7,7,16
   476	VPERM IN1, IN0, MASK, IN0      // vperm 1,2,1,5
   477	VNCIPHER ZERO, IN0, ZERO       // vncipher 0,0,1
   478	LVX (BLK_KEY)(BLK_IDX), IN0    // lvx 1,7,5
   479	ADD $16, BLK_IDX, BLK_IDX      // addi 7,7,16
   480	BC 0x10, 0, loop_dec           // bdnz .Loop_dec
   481
   482	VPERM IN0, IN1, MASK, IN1      // vperm 2,1,2,5
   483	VNCIPHER ZERO, IN1, ZERO       // vncipher 0,0,2
   484	LVX (BLK_KEY)(BLK_IDX), IN1    // lvx 2,7,5
   485	VPERM IN1, IN0, MASK, IN0      // vperm 1,2,1,5
   486	VNCIPHERLAST ZERO, IN0, ZERO   // vncipherlast 0,0,1
   487
   488	VSPLTISB $-1, IN1              // vspltisb 2,-1
   489	VXOR IN0, IN0, IN0             // vxor 1,1,1
   490	MOVD $15, BLK_IDX              // li 7,15
   491	VPERM IN1, IN0, KEY, IN1       // vperm 2,2,1,3
   492	VXOR KEY, RCON, KEY            // vxor 3,3,4
   493	LVX (BLK_OUT)(R0), IN0         // lvx 1,0,4
   494	VPERM ZERO, ZERO, KEY, ZERO    // vperm 0,0,0,3
   495	VSEL IN0, ZERO, IN1, IN0       // vsel 1,1,0,2
   496	LVX (BLK_OUT)(BLK_IDX), RCON   // lvx 4,7,4
   497	STVX IN0, (BLK_OUT+R0)         // stvx 1,0,4
   498	VSEL ZERO, RCON, IN1, ZERO     // vsel 0,0,4,2
   499	STVX ZERO, (BLK_OUT+BLK_IDX)   // stvx 0,7,4
   500
   501	RET                            // blr

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