/*
* Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define BR_POWER_ASM_MACROS 1
#include "inner.h"
#if BR_POWER8
/* see bearssl_block.h */
const br_block_ctrcbc_class *
br_aes_pwr8_ctrcbc_get_vtable(void)
{
return br_aes_pwr8_supported() ? &br_aes_pwr8_ctrcbc_vtable : NULL;
}
/* see bearssl_block.h */
void
br_aes_pwr8_ctrcbc_init(br_aes_pwr8_ctrcbc_keys *ctx,
const void *key, size_t len)
{
ctx->vtable = &br_aes_pwr8_ctrcbc_vtable;
ctx->num_rounds = br_aes_pwr8_keysched(ctx->skey.skni, key, len);
}
/*
* Register conventions for CTR + CBC-MAC:
*
* AES subkeys are in registers 0 to 10/12/14 (depending on keys size)
* Register v15 contains the byteswap index register (little-endian only)
* Register v16 contains the CTR counter value
* Register v17 contains the CBC-MAC current value
* Registers v18 to v27 are scratch
* Counter increment uses v28, v29 and v30
*
* For CTR alone:
*
* AES subkeys are in registers 0 to 10/12/14 (depending on keys size)
* Register v15 contains the byteswap index register (little-endian only)
* Registers v16 to v19 contain the CTR counter values (four blocks)
* Registers v20 to v27 are scratch
* Counter increment uses v28, v29 and v30
*/
#define LOAD_SUBKEYS_128 \
lxvw4x(32, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(33, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(34, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(35, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(36, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(37, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(38, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(39, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(40, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(41, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(42, %[cc], %[sk])
#define LOAD_SUBKEYS_192 \
LOAD_SUBKEYS_128 \
addi(%[cc], %[cc], 16) \
lxvw4x(43, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(44, %[cc], %[sk])
#define LOAD_SUBKEYS_256 \
LOAD_SUBKEYS_192 \
addi(%[cc], %[cc], 16) \
lxvw4x(45, %[cc], %[sk]) \
addi(%[cc], %[cc], 16) \
lxvw4x(46, %[cc], %[sk])
#define BLOCK_ENCRYPT_128(x) \
vxor(x, x, 0) \
vcipher(x, x, 1) \
vcipher(x, x, 2) \
vcipher(x, x, 3) \
vcipher(x, x, 4) \
vcipher(x, x, 5) \
vcipher(x, x, 6) \
vcipher(x, x, 7) \
vcipher(x, x, 8) \
vcipher(x, x, 9) \
vcipherlast(x, x, 10)
#define BLOCK_ENCRYPT_192(x) \
vxor(x, x, 0) \
vcipher(x, x, 1) \
vcipher(x, x, 2) \
vcipher(x, x, 3) \
vcipher(x, x, 4) \
vcipher(x, x, 5) \
vcipher(x, x, 6) \
vcipher(x, x, 7) \
vcipher(x, x, 8) \
vcipher(x, x, 9) \
vcipher(x, x, 10) \
vcipher(x, x, 11) \
vcipherlast(x, x, 12)
#define BLOCK_ENCRYPT_256(x) \
vxor(x, x, 0) \
vcipher(x, x, 1) \
vcipher(x, x, 2) \
vcipher(x, x, 3) \
vcipher(x, x, 4) \
vcipher(x, x, 5) \
vcipher(x, x, 6) \
vcipher(x, x, 7) \
vcipher(x, x, 8) \
vcipher(x, x, 9) \
vcipher(x, x, 10) \
vcipher(x, x, 11) \
vcipher(x, x, 12) \
vcipher(x, x, 13) \
vcipherlast(x, x, 14)
#define BLOCK_ENCRYPT_X2_128(x, y) \
vxor(x, x, 0) \
vxor(y, y, 0) \
vcipher(x, x, 1) \
vcipher(y, y, 1) \
vcipher(x, x, 2) \
vcipher(y, y, 2) \
vcipher(x, x, 3) \
vcipher(y, y, 3) \
vcipher(x, x, 4) \
vcipher(y, y, 4) \
vcipher(x, x, 5) \
vcipher(y, y, 5) \
vcipher(x, x, 6) \
vcipher(y, y, 6) \
vcipher(x, x, 7) \
vcipher(y, y, 7) \
vcipher(x, x, 8) \
vcipher(y, y, 8) \
vcipher(x, x, 9) \
vcipher(y, y, 9) \
vcipherlast(x, x, 10) \
vcipherlast(y, y, 10)
#define BLOCK_ENCRYPT_X2_192(x, y) \
vxor(x, x, 0) \
vxor(y, y, 0) \
vcipher(x, x, 1) \
vcipher(y, y, 1) \
vcipher(x, x, 2) \
vcipher(y, y, 2) \
vcipher(x, x, 3) \
vcipher(y, y, 3) \
vcipher(x, x, 4) \
vcipher(y, y, 4) \
vcipher(x, x, 5) \
vcipher(y, y, 5) \
vcipher(x, x, 6) \
vcipher(y, y, 6) \
vcipher(x, x, 7) \
vcipher(y, y, 7) \
vcipher(x, x, 8) \
vcipher(y, y, 8) \
vcipher(x, x, 9) \
vcipher(y, y, 9) \
vcipher(x, x, 10) \
vcipher(y, y, 10) \
vcipher(x, x, 11) \
vcipher(y, y, 11) \
vcipherlast(x, x, 12) \
vcipherlast(y, y, 12)
#define BLOCK_ENCRYPT_X2_256(x, y) \
vxor(x, x, 0) \
vxor(y, y, 0) \
vcipher(x, x, 1) \
vcipher(y, y, 1) \
vcipher(x, x, 2) \
vcipher(y, y, 2) \
vcipher(x, x, 3) \
vcipher(y, y, 3) \
vcipher(x, x, 4) \
vcipher(y, y, 4) \
vcipher(x, x, 5) \
vcipher(y, y, 5) \
vcipher(x, x, 6) \
vcipher(y, y, 6) \
vcipher(x, x, 7) \
vcipher(y, y, 7) \
vcipher(x, x, 8) \
vcipher(y, y, 8) \
vcipher(x, x, 9) \
vcipher(y, y, 9) \
vcipher(x, x, 10) \
vcipher(y, y, 10) \
vcipher(x, x, 11) \
vcipher(y, y, 11) \
vcipher(x, x, 12) \
vcipher(y, y, 12) \
vcipher(x, x, 13) \
vcipher(y, y, 13) \
vcipherlast(x, x, 14) \
vcipherlast(y, y, 14)
#define BLOCK_ENCRYPT_X4_128(x0, x1, x2, x3) \
vxor(x0, x0, 0) \
vxor(x1, x1, 0) \
vxor(x2, x2, 0) \
vxor(x3, x3, 0) \
vcipher(x0, x0, 1) \
vcipher(x1, x1, 1) \
vcipher(x2, x2, 1) \
vcipher(x3, x3, 1) \
vcipher(x0, x0, 2) \
vcipher(x1, x1, 2) \
vcipher(x2, x2, 2) \
vcipher(x3, x3, 2) \
vcipher(x0, x0, 3) \
vcipher(x1, x1, 3) \
vcipher(x2, x2, 3) \
vcipher(x3, x3, 3) \
vcipher(x0, x0, 4) \
vcipher(x1, x1, 4) \
vcipher(x2, x2, 4) \
vcipher(x3, x3, 4) \
vcipher(x0, x0, 5) \
vcipher(x1, x1, 5) \
vcipher(x2, x2, 5) \
vcipher(x3, x3, 5) \
vcipher(x0, x0, 6) \
vcipher(x1, x1, 6) \
vcipher(x2, x2, 6) \
vcipher(x3, x3, 6) \
vcipher(x0, x0, 7) \
vcipher(x1, x1, 7) \
vcipher(x2, x2, 7) \
vcipher(x3, x3, 7) \
vcipher(x0, x0, 8) \
vcipher(x1, x1, 8) \
vcipher(x2, x2, 8) \
vcipher(x3, x3, 8) \
vcipher(x0, x0, 9) \
vcipher(x1, x1, 9) \
vcipher(x2, x2, 9) \
vcipher(x3, x3, 9) \
vcipherlast(x0, x0, 10) \
vcipherlast(x1, x1, 10) \
vcipherlast(x2, x2, 10) \
vcipherlast(x3, x3, 10)
#define BLOCK_ENCRYPT_X4_192(x0, x1, x2, x3) \
vxor(x0, x0, 0) \
vxor(x1, x1, 0) \
vxor(x2, x2, 0) \
vxor(x3, x3, 0) \
vcipher(x0, x0, 1) \
vcipher(x1, x1, 1) \
vcipher(x2, x2, 1) \
vcipher(x3, x3, 1) \
vcipher(x0, x0, 2) \
vcipher(x1, x1, 2) \
vcipher(x2, x2, 2) \
vcipher(x3, x3, 2) \
vcipher(x0, x0, 3) \
vcipher(x1, x1, 3) \
vcipher(x2, x2, 3) \
vcipher(x3, x3, 3) \
vcipher(x0, x0, 4) \
vcipher(x1, x1, 4) \
vcipher(x2, x2, 4) \
vcipher(x3, x3, 4) \
vcipher(x0, x0, 5) \
vcipher(x1, x1, 5) \
vcipher(x2, x2, 5) \
vcipher(x3, x3, 5) \
vcipher(x0, x0, 6) \
vcipher(x1, x1, 6) \
vcipher(x2, x2, 6) \
vcipher(x3, x3, 6) \
vcipher(x0, x0, 7) \
vcipher(x1, x1, 7) \
vcipher(x2, x2, 7) \
vcipher(x3, x3, 7) \
vcipher(x0, x0, 8) \
vcipher(x1, x1, 8) \
vcipher(x2, x2, 8) \
vcipher(x3, x3, 8) \
vcipher(x0, x0, 9) \
vcipher(x1, x1, 9) \
vcipher(x2, x2, 9) \
vcipher(x3, x3, 9) \
vcipher(x0, x0, 10) \
vcipher(x1, x1, 10) \
vcipher(x2, x2, 10) \
vcipher(x3, x3, 10) \
vcipher(x0, x0, 11) \
vcipher(x1, x1, 11) \
vcipher(x2, x2, 11) \
vcipher(x3, x3, 11) \
vcipherlast(x0, x0, 12) \
vcipherlast(x1, x1, 12) \
vcipherlast(x2, x2, 12) \
vcipherlast(x3, x3, 12)
#define BLOCK_ENCRYPT_X4_256(x0, x1, x2, x3) \
vxor(x0, x0, 0) \
vxor(x1, x1, 0) \
vxor(x2, x2, 0) \
vxor(x3, x3, 0) \
vcipher(x0, x0, 1) \
vcipher(x1, x1, 1) \
vcipher(x2, x2, 1) \
vcipher(x3, x3, 1) \
vcipher(x0, x0, 2) \
vcipher(x1, x1, 2) \
vcipher(x2, x2, 2) \
vcipher(x3, x3, 2) \
vcipher(x0, x0, 3) \
vcipher(x1, x1, 3) \
vcipher(x2, x2, 3) \
vcipher(x3, x3, 3) \
vcipher(x0, x0, 4) \
vcipher(x1, x1, 4) \
vcipher(x2, x2, 4) \
vcipher(x3, x3, 4) \
vcipher(x0, x0, 5) \
vcipher(x1, x1, 5) \
vcipher(x2, x2, 5) \
vcipher(x3, x3, 5) \
vcipher(x0, x0, 6) \
vcipher(x1, x1, 6) \
vcipher(x2, x2, 6) \
vcipher(x3, x3, 6) \
vcipher(x0, x0, 7) \
vcipher(x1, x1, 7) \
vcipher(x2, x2, 7) \
vcipher(x3, x3, 7) \
vcipher(x0, x0, 8) \
vcipher(x1, x1, 8) \
vcipher(x2, x2, 8) \
vcipher(x3, x3, 8) \
vcipher(x0, x0, 9) \
vcipher(x1, x1, 9) \
vcipher(x2, x2, 9) \
vcipher(x3, x3, 9) \
vcipher(x0, x0, 10) \
vcipher(x1, x1, 10) \
vcipher(x2, x2, 10) \
vcipher(x3, x3, 10) \
vcipher(x0, x0, 11) \
vcipher(x1, x1, 11) \
vcipher(x2, x2, 11) \
vcipher(x3, x3, 11) \
vcipher(x0, x0, 12) \
vcipher(x1, x1, 12) \
vcipher(x2, x2, 12) \
vcipher(x3, x3, 12) \
vcipher(x0, x0, 13) \
vcipher(x1, x1, 13) \
vcipher(x2, x2, 13) \
vcipher(x3, x3, 13) \
vcipherlast(x0, x0, 14) \
vcipherlast(x1, x1, 14) \
vcipherlast(x2, x2, 14) \
vcipherlast(x3, x3, 14)
#if BR_POWER8_LE
static const uint32_t idx2be[] = {
0x03020100, 0x07060504, 0x0B0A0908, 0x0F0E0D0C
};
#define BYTESWAP_INIT lxvw4x(47, 0, %[idx2be])
#define BYTESWAP(x) vperm(x, x, x, 15)
#define BYTESWAPX(d, s) vperm(d, s, s, 15)
#define BYTESWAP_REG , [idx2be] "b" (idx2be)
#else
#define BYTESWAP_INIT
#define BYTESWAP(x)
#define BYTESWAPX(d, s) vand(d, s, s)
#define BYTESWAP_REG
#endif
static const uint32_t ctrinc[] = {
0, 0, 0, 1
};
static const uint32_t ctrinc_x4[] = {
0, 0, 0, 4
};
#define INCR_128_INIT lxvw4x(60, 0, %[ctrinc])
#define INCR_128_X4_INIT lxvw4x(60, 0, %[ctrinc_x4])
#define INCR_128(d, s) \
vaddcuw(29, s, 28) \
vadduwm(d, s, 28) \
vsldoi(30, 29, 29, 4) \
vaddcuw(29, d, 30) \
vadduwm(d, d, 30) \
vsldoi(30, 29, 29, 4) \
vaddcuw(29, d, 30) \
vadduwm(d, d, 30) \
vsldoi(30, 29, 29, 4) \
vadduwm(d, d, 30)
#define MKCTR(size) \
static void \
ctr_ ## size(const unsigned char *sk, \
unsigned char *ctrbuf, unsigned char *buf, size_t num_blocks_x4) \
{ \
long cc, cc0, cc1, cc2, cc3; \
\
cc = 0; \
cc0 = 0; \
cc1 = 16; \
cc2 = 32; \
cc3 = 48; \
asm volatile ( \
\
/* \
* Load subkeys into v0..v10 \
*/ \
LOAD_SUBKEYS_ ## size \
li(%[cc], 0) \
\
BYTESWAP_INIT \
INCR_128_X4_INIT \
\
/* \
* Load current CTR counters into v16 to v19. \
*/ \
lxvw4x(48, %[cc0], %[ctrbuf]) \
lxvw4x(49, %[cc1], %[ctrbuf]) \
lxvw4x(50, %[cc2], %[ctrbuf]) \
lxvw4x(51, %[cc3], %[ctrbuf]) \
BYTESWAP(16) \
BYTESWAP(17) \
BYTESWAP(18) \
BYTESWAP(19) \
\
mtctr(%[num_blocks_x4]) \
\
label(loop) \
/* \
* Compute next counter values into v20..v23. \
*/ \
INCR_128(20, 16) \
INCR_128(21, 17) \
INCR_128(22, 18) \
INCR_128(23, 19) \
\
/* \
* Encrypt counter values and XOR into next data blocks. \
*/ \
lxvw4x(56, %[cc0], %[buf]) \
lxvw4x(57, %[cc1], %[buf]) \
lxvw4x(58, %[cc2], %[buf]) \
lxvw4x(59, %[cc3], %[buf]) \
BYTESWAP(24) \
BYTESWAP(25) \
BYTESWAP(26) \
BYTESWAP(27) \
BLOCK_ENCRYPT_X4_ ## size(16, 17, 18, 19) \
vxor(16, 16, 24) \
vxor(17, 17, 25) \
vxor(18, 18, 26) \
vxor(19, 19, 27) \
BYTESWAP(16) \
BYTESWAP(17) \
BYTESWAP(18) \
BYTESWAP(19) \
stxvw4x(48, %[cc0], %[buf]) \
stxvw4x(49, %[cc1], %[buf]) \
stxvw4x(50, %[cc2], %[buf]) \
stxvw4x(51, %[cc3], %[buf]) \
\
/* \
* Update counters and data pointer. \
*/ \
vand(16, 20, 20) \
vand(17, 21, 21) \
vand(18, 22, 22) \
vand(19, 23, 23) \
addi(%[buf], %[buf], 64) \
\
bdnz(loop) \
\
/* \
* Write back new counter values. \
*/ \
BYTESWAP(16) \
BYTESWAP(17) \
BYTESWAP(18) \
BYTESWAP(19) \
stxvw4x(48, %[cc0], %[ctrbuf]) \
stxvw4x(49, %[cc1], %[ctrbuf]) \
stxvw4x(50, %[cc2], %[ctrbuf]) \
stxvw4x(51, %[cc3], %[ctrbuf]) \
\
: [cc] "+b" (cc), [buf] "+b" (buf), \
[cc0] "+b" (cc0), [cc1] "+b" (cc1), [cc2] "+b" (cc2), [cc3] "+b" (cc3) \
: [sk] "b" (sk), [ctrbuf] "b" (ctrbuf), \
[num_blocks_x4] "b" (num_blocks_x4), [ctrinc_x4] "b" (ctrinc_x4) \
BYTESWAP_REG \
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", \
"v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", \
"v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", \
"v30", "ctr", "memory" \
); \
}
MKCTR(128)
MKCTR(192)
MKCTR(256)
#define MKCBCMAC(size) \
static void \
cbcmac_ ## size(const unsigned char *sk, \
unsigned char *cbcmac, const unsigned char *buf, size_t num_blocks) \
{ \
long cc; \
\
cc = 0; \
asm volatile ( \
\
/* \
* Load subkeys into v0..v10 \
*/ \
LOAD_SUBKEYS_ ## size \
li(%[cc], 0) \
\
BYTESWAP_INIT \
\
/* \
* Load current CBC-MAC value into v16. \
*/ \
lxvw4x(48, %[cc], %[cbcmac]) \
BYTESWAP(16) \
\
mtctr(%[num_blocks]) \
\
label(loop) \
/* \
* Load next block, XOR into current CBC-MAC value, \
* and then encrypt it. \
*/ \
lxvw4x(49, %[cc], %[buf]) \
BYTESWAP(17) \
vxor(16, 16, 17) \
BLOCK_ENCRYPT_ ## size(16) \
addi(%[buf], %[buf], 16) \
\
bdnz(loop) \
\
/* \
* Write back new CBC-MAC value. \
*/ \
BYTESWAP(16) \
stxvw4x(48, %[cc], %[cbcmac]) \
\
: [cc] "+b" (cc), [buf] "+b" (buf) \
: [sk] "b" (sk), [cbcmac] "b" (cbcmac), [num_blocks] "b" (num_blocks) \
BYTESWAP_REG \
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", \
"v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", \
"v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", \
"v30", "ctr", "memory" \
); \
}
MKCBCMAC(128)
MKCBCMAC(192)
MKCBCMAC(256)
#define MKENCRYPT(size) \
static void \
ctrcbc_ ## size ## _encrypt(const unsigned char *sk, \
unsigned char *ctr, unsigned char *cbcmac, unsigned char *buf, \
size_t num_blocks) \
{ \
long cc; \
\
cc = 0; \
asm volatile ( \
\
/* \
* Load subkeys into v0..v10 \
*/ \
LOAD_SUBKEYS_ ## size \
li(%[cc], 0) \
\
BYTESWAP_INIT \
INCR_128_INIT \
\
/* \
* Load current CTR counter into v16, and current \
* CBC-MAC IV into v17. \
*/ \
lxvw4x(48, %[cc], %[ctr]) \
lxvw4x(49, %[cc], %[cbcmac]) \
BYTESWAP(16) \
BYTESWAP(17) \
\
/* \
* At each iteration, we do two parallel encryption: \
* - new counter value for encryption of the next block; \
* - CBC-MAC over the previous encrypted block. \
* Thus, each plaintext block implies two AES instances, \
* over two successive iterations. This requires a single \
* counter encryption before the loop, and a single \
* CBC-MAC encryption after the loop. \
*/ \
\
/* \
* Encrypt first block (into v20). \
*/ \
lxvw4x(52, %[cc], %[buf]) \
BYTESWAP(20) \
INCR_128(22, 16) \
BLOCK_ENCRYPT_ ## size(16) \
vxor(20, 20, 16) \
BYTESWAPX(21, 20) \
stxvw4x(53, %[cc], %[buf]) \
vand(16, 22, 22) \
addi(%[buf], %[buf], 16) \
\
/* \
* Load loop counter; skip the loop if there is only \
* one block in total (already handled by the boundary \
* conditions). \
*/ \
mtctr(%[num_blocks]) \
bdz(fastexit) \
\
label(loop) \
/* \
* Upon loop entry: \
* v16 counter value for next block \
* v17 current CBC-MAC value \
* v20 encrypted previous block \
*/ \
vxor(17, 17, 20) \
INCR_128(22, 16) \
lxvw4x(52, %[cc], %[buf]) \
BYTESWAP(20) \
BLOCK_ENCRYPT_X2_ ## size(16, 17) \
vxor(20, 20, 16) \
BYTESWAPX(21, 20) \
stxvw4x(53, %[cc], %[buf]) \
addi(%[buf], %[buf], 16) \
vand(16, 22, 22) \
\
bdnz(loop) \
\
label(fastexit) \
vxor(17, 17, 20) \
BLOCK_ENCRYPT_ ## size(17) \
BYTESWAP(16) \
BYTESWAP(17) \
stxvw4x(48, %[cc], %[ctr]) \
stxvw4x(49, %[cc], %[cbcmac]) \
\
: [cc] "+b" (cc), [buf] "+b" (buf) \
: [sk] "b" (sk), [ctr] "b" (ctr), [cbcmac] "b" (cbcmac), \
[num_blocks] "b" (num_blocks), [ctrinc] "b" (ctrinc) \
BYTESWAP_REG \
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", \
"v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", \
"v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", \
"v30", "ctr", "memory" \
); \
}
MKENCRYPT(128)
MKENCRYPT(192)
MKENCRYPT(256)
#define MKDECRYPT(size) \
static void \
ctrcbc_ ## size ## _decrypt(const unsigned char *sk, \
unsigned char *ctr, unsigned char *cbcmac, unsigned char *buf, \
size_t num_blocks) \
{ \
long cc; \
\
cc = 0; \
asm volatile ( \
\
/* \
* Load subkeys into v0..v10 \
*/ \
LOAD_SUBKEYS_ ## size \
li(%[cc], 0) \
\
BYTESWAP_INIT \
INCR_128_INIT \
\
/* \
* Load current CTR counter into v16, and current \
* CBC-MAC IV into v17. \
*/ \
lxvw4x(48, %[cc], %[ctr]) \
lxvw4x(49, %[cc], %[cbcmac]) \
BYTESWAP(16) \
BYTESWAP(17) \
\
/* \
* At each iteration, we do two parallel encryption: \
* - new counter value for decryption of the next block; \
* - CBC-MAC over the next encrypted block. \
* Each iteration performs the two AES instances related \
* to the current block; there is thus no need for some \
* extra pre-loop and post-loop work as in encryption. \
*/ \
\
mtctr(%[num_blocks]) \
\
label(loop) \
/* \
* Upon loop entry: \
* v16 counter value for next block \
* v17 current CBC-MAC value \
*/ \
lxvw4x(52, %[cc], %[buf]) \
BYTESWAP(20) \
vxor(17, 17, 20) \
INCR_128(22, 16) \
BLOCK_ENCRYPT_X2_ ## size(16, 17) \
vxor(20, 20, 16) \
BYTESWAPX(21, 20) \
stxvw4x(53, %[cc], %[buf]) \
addi(%[buf], %[buf], 16) \
vand(16, 22, 22) \
\
bdnz(loop) \
\
/* \
* Store back counter and CBC-MAC value. \
*/ \
BYTESWAP(16) \
BYTESWAP(17) \
stxvw4x(48, %[cc], %[ctr]) \
stxvw4x(49, %[cc], %[cbcmac]) \
\
: [cc] "+b" (cc), [buf] "+b" (buf) \
: [sk] "b" (sk), [ctr] "b" (ctr), [cbcmac] "b" (cbcmac), \
[num_blocks] "b" (num_blocks), [ctrinc] "b" (ctrinc) \
BYTESWAP_REG \
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", \
"v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", \
"v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", \
"v30", "ctr", "memory" \
); \
}
MKDECRYPT(128)
MKDECRYPT(192)
MKDECRYPT(256)
/* see bearssl_block.h */
void
br_aes_pwr8_ctrcbc_encrypt(const br_aes_pwr8_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len)
{
if (len == 0) {
return;
}
switch (ctx->num_rounds) {
case 10:
ctrcbc_128_encrypt(ctx->skey.skni, ctr, cbcmac, data, len >> 4);
break;
case 12:
ctrcbc_192_encrypt(ctx->skey.skni, ctr, cbcmac, data, len >> 4);
break;
default:
ctrcbc_256_encrypt(ctx->skey.skni, ctr, cbcmac, data, len >> 4);
break;
}
}
/* see bearssl_block.h */
void
br_aes_pwr8_ctrcbc_decrypt(const br_aes_pwr8_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len)
{
if (len == 0) {
return;
}
switch (ctx->num_rounds) {
case 10:
ctrcbc_128_decrypt(ctx->skey.skni, ctr, cbcmac, data, len >> 4);
break;
case 12:
ctrcbc_192_decrypt(ctx->skey.skni, ctr, cbcmac, data, len >> 4);
break;
default:
ctrcbc_256_decrypt(ctx->skey.skni, ctr, cbcmac, data, len >> 4);
break;
}
}
static inline void
incr_ctr(void *dst, const void *src)
{
uint64_t hi, lo;
hi = br_dec64be(src);
lo = br_dec64be((const unsigned char *)src + 8);
lo ++;
hi += ((lo | -lo) >> 63) ^ (uint64_t)1;
br_enc64be(dst, hi);
br_enc64be((unsigned char *)dst + 8, lo);
}
/* see bearssl_block.h */
void
br_aes_pwr8_ctrcbc_ctr(const br_aes_pwr8_ctrcbc_keys *ctx,
void *ctr, void *data, size_t len)
{
unsigned char ctrbuf[64];
memcpy(ctrbuf, ctr, 16);
incr_ctr(ctrbuf + 16, ctrbuf);
incr_ctr(ctrbuf + 32, ctrbuf + 16);
incr_ctr(ctrbuf + 48, ctrbuf + 32);
if (len >= 64) {
switch (ctx->num_rounds) {
case 10:
ctr_128(ctx->skey.skni, ctrbuf, data, len >> 6);
break;
case 12:
ctr_192(ctx->skey.skni, ctrbuf, data, len >> 6);
break;
default:
ctr_256(ctx->skey.skni, ctrbuf, data, len >> 6);
break;
}
data = (unsigned char *)data + (len & ~(size_t)63);
len &= 63;
}
if (len > 0) {
unsigned char tmp[64];
if (len >= 32) {
if (len >= 48) {
memcpy(ctr, ctrbuf + 48, 16);
} else {
memcpy(ctr, ctrbuf + 32, 16);
}
} else {
if (len >= 16) {
memcpy(ctr, ctrbuf + 16, 16);
}
}
memcpy(tmp, data, len);
memset(tmp + len, 0, (sizeof tmp) - len);
switch (ctx->num_rounds) {
case 10:
ctr_128(ctx->skey.skni, ctrbuf, tmp, 1);
break;
case 12:
ctr_192(ctx->skey.skni, ctrbuf, tmp, 1);
break;
default:
ctr_256(ctx->skey.skni, ctrbuf, tmp, 1);
break;
}
memcpy(data, tmp, len);
} else {
memcpy(ctr, ctrbuf, 16);
}
}
/* see bearssl_block.h */
void
br_aes_pwr8_ctrcbc_mac(const br_aes_pwr8_ctrcbc_keys *ctx,
void *cbcmac, const void *data, size_t len)
{
if (len > 0) {
switch (ctx->num_rounds) {
case 10:
cbcmac_128(ctx->skey.skni, cbcmac, data, len >> 4);
break;
case 12:
cbcmac_192(ctx->skey.skni, cbcmac, data, len >> 4);
break;
default:
cbcmac_256(ctx->skey.skni, cbcmac, data, len >> 4);
break;
}
}
}
/* see bearssl_block.h */
const br_block_ctrcbc_class br_aes_pwr8_ctrcbc_vtable = {
sizeof(br_aes_pwr8_ctrcbc_keys),
16,
4,
(void (*)(const br_block_ctrcbc_class **, const void *, size_t))
&br_aes_pwr8_ctrcbc_init,
(void (*)(const br_block_ctrcbc_class *const *,
void *, void *, void *, size_t))
&br_aes_pwr8_ctrcbc_encrypt,
(void (*)(const br_block_ctrcbc_class *const *,
void *, void *, void *, size_t))
&br_aes_pwr8_ctrcbc_decrypt,
(void (*)(const br_block_ctrcbc_class *const *,
void *, void *, size_t))
&br_aes_pwr8_ctrcbc_ctr,
(void (*)(const br_block_ctrcbc_class *const *,
void *, const void *, size_t))
&br_aes_pwr8_ctrcbc_mac
};
#else
/* see bearssl_block.h */
const br_block_ctrcbc_class *
br_aes_pwr8_ctrcbc_get_vtable(void)
{
return NULL;
}
#endif