static
int stack_strcmp(struct estack *stack, int top, const char *cmp_type)
{
size_t offset_bx = 0, offset_ax = 0;
int diff, has_user = 0;
mm_segment_t old_fs;
if (estack_bx(stack, top)->u.s.user
|| estack_ax(stack, top)->u.s.user) {
has_user = 1;
old_fs = get_fs();
set_fs(KERNEL_DS);
pagefault_disable();
}
for (;;) {
int ret;
int escaped_r0 = 0;
char char_bx, char_ax;
char_bx = get_char(estack_bx(stack, top), offset_bx);
char_ax = get_char(estack_ax(stack, top), offset_ax);
if (unlikely(char_bx == '\0')) {
if (char_ax == '\0') {
diff = 0;
break;
} else {
if (estack_ax(stack, top)->u.s.literal) {
ret = parse_char(estack_ax(stack, top),
&char_ax, &offset_ax);
if (ret == -1) {
diff = 0;
break;
}
}
diff = -1;
break;
}
}
if (unlikely(char_ax == '\0')) {
if (char_bx == '\0') {
diff = 0;
break;
} else {
if (estack_bx(stack, top)->u.s.literal) {
ret = parse_char(estack_bx(stack, top),
&char_bx, &offset_bx);
if (ret == -1) {
diff = 0;
break;
}
}
diff = 1;
break;
}
}
if (estack_bx(stack, top)->u.s.literal) {
ret = parse_char(estack_bx(stack, top),
&char_bx, &offset_bx);
if (ret == -1) {
diff = 0;
break;
} else if (ret == -2) {
escaped_r0 = 1;
}
/* else compare both char */
}
if (estack_ax(stack, top)->u.s.literal) {
ret = parse_char(estack_ax(stack, top),
&char_ax, &offset_ax);
if (ret == -1) {
diff = 0;
break;
} else if (ret == -2) {
if (!escaped_r0) {
diff = -1;
break;
}
} else {
if (escaped_r0) {
diff = 1;
break;
}
}
} else {
if (escaped_r0) {
diff = 1;
break;
}
}
diff = char_bx - char_ax;
if (diff != 0)
break;
offset_bx++;
offset_ax++;
}
if (has_user) {
pagefault_enable();
set_fs(old_fs);
}
return diff;
}
static int p8_aes_ctr_crypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
int ret;
u64 inc;
struct blkcipher_walk walk;
struct p8_aes_ctr_ctx *ctx =
crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
struct blkcipher_desc fallback_desc = {
.tfm = ctx->fallback,
.info = desc->info,
.flags = desc->flags
};
if (in_interrupt()) {
ret = crypto_blkcipher_encrypt(&fallback_desc, dst, src,
nbytes);
} else {
blkcipher_walk_init(&walk, dst, src, nbytes);
ret = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
preempt_disable();
pagefault_disable();
enable_kernel_vsx();
aes_p8_ctr32_encrypt_blocks(walk.src.virt.addr,
walk.dst.virt.addr,
(nbytes &
AES_BLOCK_MASK) /
AES_BLOCK_SIZE,
&ctx->enc_key,
walk.iv);
disable_kernel_vsx();
pagefault_enable();
preempt_enable();
/* We need to update IV mostly for last bytes/round */
inc = (nbytes & AES_BLOCK_MASK) / AES_BLOCK_SIZE;
if (inc > 0)
while (inc--)
crypto_inc(walk.iv, AES_BLOCK_SIZE);
nbytes &= AES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, &walk, nbytes);
}
if (walk.nbytes) {
p8_aes_ctr_final(ctx, &walk);
ret = blkcipher_walk_done(desc, &walk, 0);
}
}
return ret;
}
struct crypto_alg p8_aes_ctr_alg = {
.cra_name = "ctr(aes)",
.cra_driver_name = "p8_aes_ctr",
.cra_module = THIS_MODULE,
.cra_priority = 2000,
.cra_type = &crypto_blkcipher_type,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK,
.cra_alignmask = 0,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct p8_aes_ctr_ctx),
.cra_init = p8_aes_ctr_init,
.cra_exit = p8_aes_ctr_exit,
.cra_blkcipher = {
.ivsize = AES_BLOCK_SIZE,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = p8_aes_ctr_setkey,
.encrypt = p8_aes_ctr_crypt,
.decrypt = p8_aes_ctr_crypt,
},
};
static int p8_aes_cbc_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
int ret;
struct blkcipher_walk walk;
struct p8_aes_cbc_ctx *ctx =
crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
struct blkcipher_desc fallback_desc = {
.tfm = ctx->fallback,
.info = desc->info,
.flags = desc->flags
};
if (in_interrupt()) {
ret = crypto_blkcipher_encrypt(&fallback_desc, dst, src,
nbytes);
} else {
preempt_disable();
pagefault_disable();
enable_kernel_altivec();
enable_kernel_vsx();
blkcipher_walk_init(&walk, dst, src, nbytes);
ret = blkcipher_walk_virt(desc, &walk);
while ((nbytes = walk.nbytes)) {
aes_p8_cbc_encrypt(walk.src.virt.addr,
walk.dst.virt.addr,
nbytes & AES_BLOCK_MASK,
&ctx->enc_key, walk.iv, 1);
nbytes &= AES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, &walk, nbytes);
}
pagefault_enable();
preempt_enable();
}
return ret;
}
static int p8_aes_cbc_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
int ret;
struct blkcipher_walk walk;
struct p8_aes_cbc_ctx *ctx =
crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
struct blkcipher_desc fallback_desc = {
.tfm = ctx->fallback,
.info = desc->info,
.flags = desc->flags
};
if (in_interrupt()) {
ret = crypto_blkcipher_decrypt(&fallback_desc, dst, src,
nbytes);
} else {
preempt_disable();
pagefault_disable();
enable_kernel_altivec();
enable_kernel_vsx();
blkcipher_walk_init(&walk, dst, src, nbytes);
ret = blkcipher_walk_virt(desc, &walk);
while ((nbytes = walk.nbytes)) {
aes_p8_cbc_encrypt(walk.src.virt.addr,
walk.dst.virt.addr,
nbytes & AES_BLOCK_MASK,
&ctx->dec_key, walk.iv, 0);
nbytes &= AES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, &walk, nbytes);
}
pagefault_enable();
preempt_enable();
}
return ret;
}
struct crypto_alg p8_aes_cbc_alg = {
.cra_name = "cbc(aes)",
.cra_driver_name = "p8_aes_cbc",
.cra_module = THIS_MODULE,
.cra_priority = 1000,
.cra_type = &crypto_blkcipher_type,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK,
.cra_alignmask = 0,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct p8_aes_cbc_ctx),
.cra_init = p8_aes_cbc_init,
.cra_exit = p8_aes_cbc_exit,
.cra_blkcipher = {
.ivsize = 0,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = p8_aes_cbc_setkey,
.encrypt = p8_aes_cbc_encrypt,
.decrypt = p8_aes_cbc_decrypt,
},
};