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author | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-07-21 20:21:51 -0300 |
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committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-07-21 20:21:51 -0300 |
commit | f0ac15bbc96ebfde7dfe128f8260d58fc794fbe3 (patch) | |
tree | 2c8338c93b2e5e1c4fb2c36de1524adf76605f25 /crypto/lz4hc.c | |
parent | ab1aff59fb9770e4a5b931293a695416cf23000c (diff) | |
parent | 60c61f0d0919094cede7f96cf52cc79829b82e02 (diff) | |
download | linux-crypto-f0ac15bbc96ebfde7dfe128f8260d58fc794fbe3.tar.gz linux-crypto-f0ac15bbc96ebfde7dfe128f8260d58fc794fbe3.zip |
Merge tag 'v3.11-rc2' into patchwork
Linux 3.11-rc2
* tag 'v3.11-rc2': (9535 commits)
Linux 3.11-rc2
ext3: fix a BUG when opening a file with O_TMPFILE flag
ext4: fix a BUG when opening a file with O_TMPFILE flag
vfs: constify dentry parameter in d_count()
livelock avoidance in sget()
allow O_TMPFILE to work with O_WRONLY
Btrfs: fix wrong write offset when replacing a device
Btrfs: re-add root to dead root list if we stop dropping it
Btrfs: fix lock leak when resuming snapshot deletion
Btrfs: update drop progress before stopping snapshot dropping
arm64: use common reboot infrastructure
arm64: mm: don't treat user cache maintenance faults as writes
arm64: add '#ifdef CONFIG_COMPAT' for aarch32_break_handler()
arm64: Only enable local interrupts after the CPU is marked online
MIPS: kvm: Kconfig: Drop HAVE_KVM dependency from VIRTUALIZATION
um: remove dead code
um: siginfo cleanup
MIPS: Octeon: Fix DT pruning bug with pip ports
uml: Fix which_tmpdir failure when /dev/shm is a symlink, and in other edge cases
um: Fix wait_stub_done() error handling
...
Diffstat (limited to '')
-rw-r--r-- | crypto/lz4hc.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/crypto/lz4hc.c b/crypto/lz4hc.c new file mode 100644 index 00000000..151ba31d --- /dev/null +++ b/crypto/lz4hc.c @@ -0,0 +1,106 @@ +/* + * Cryptographic API. + * + * Copyright (c) 2013 Chanho Min <chanho.min@lge.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/crypto.h> +#include <linux/vmalloc.h> +#include <linux/lz4.h> + +struct lz4hc_ctx { + void *lz4hc_comp_mem; +}; + +static int lz4hc_init(struct crypto_tfm *tfm) +{ + struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm); + + ctx->lz4hc_comp_mem = vmalloc(LZ4HC_MEM_COMPRESS); + if (!ctx->lz4hc_comp_mem) + return -ENOMEM; + + return 0; +} + +static void lz4hc_exit(struct crypto_tfm *tfm) +{ + struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm); + + vfree(ctx->lz4hc_comp_mem); +} + +static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen) +{ + struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm); + size_t tmp_len = *dlen; + int err; + + err = lz4hc_compress(src, slen, dst, &tmp_len, ctx->lz4hc_comp_mem); + + if (err < 0) + return -EINVAL; + + *dlen = tmp_len; + return 0; +} + +static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen) +{ + int err; + size_t tmp_len = *dlen; + size_t __slen = slen; + + err = lz4_decompress(src, &__slen, dst, tmp_len); + if (err < 0) + return -EINVAL; + + *dlen = tmp_len; + return err; +} + +static struct crypto_alg alg_lz4hc = { + .cra_name = "lz4hc", + .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, + .cra_ctxsize = sizeof(struct lz4hc_ctx), + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list), + .cra_init = lz4hc_init, + .cra_exit = lz4hc_exit, + .cra_u = { .compress = { + .coa_compress = lz4hc_compress_crypto, + .coa_decompress = lz4hc_decompress_crypto } } +}; + +static int __init lz4hc_mod_init(void) +{ + return crypto_register_alg(&alg_lz4hc); +} + +static void __exit lz4hc_mod_fini(void) +{ + crypto_unregister_alg(&alg_lz4hc); +} + +module_init(lz4hc_mod_init); +module_exit(lz4hc_mod_fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("LZ4HC Compression Algorithm"); |