Hello Herbert!
I'm Zoltan Sogor at University of Szeged, Hungary, and we are working on
new flash file system (UBIFS) cooperating with Nokia Corp. We would like
to use cryptoapi in UBIFS compression/encrypt mechanism.
I've ported LZO compressor into cryptoapi. If you think the patch is
good, please apply it.
If you have any problem with the patch, your feedbacks are welcome.
Thanks,
Zoltan
>From 57c2ed2d2bf37607ce5e9abcc878b6b4f35d7cd0 Mon Sep 17 00:00:00 2001
From: Zoltan Sogor <[email protected]>
Date: Tue, 27 Nov 2007 10:11:50 +0100
Subject: [PATCH] Cryptoapi: add LZO compression algorithm support
Add LZO compression algorithm support
Signed-off-by: Zoltan Sogor <[email protected]>
---
crypto/Kconfig | 8 ++++
crypto/Makefile | 1 +
crypto/lzo.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 115 insertions(+), 0 deletions(-)
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 083d2e1..d23ea63 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -502,6 +502,14 @@ config CRYPTO_AUTHENC
Authenc: Combined mode wrapper for IPsec.
This is required for IPSec.
+config CRYPTO_LZO
+ tristate "LZO compression algorithm"
+ select CRYPTO_ALGAPI
+ select LZO_COMPRESS
+ select LZO_DECOMPRESS
+ help
+ This is the LZO algorithm.
+
source "drivers/crypto/Kconfig"
endif # if CRYPTO
diff --git a/crypto/Makefile b/crypto/Makefile
index 43c2a0d..355cf92 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o
+obj-$(CONFIG_CRYPTO_LZO) += lzo.o
obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o
diff --git a/crypto/lzo.c b/crypto/lzo.c
new file mode 100644
index 0000000..48c3288
--- /dev/null
+++ b/crypto/lzo.c
@@ -0,0 +1,106 @@
+/*
+ * Cryptographic API.
+ *
+ * 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/lzo.h>
+
+struct lzo_ctx {
+ void *lzo_comp_mem;
+};
+
+static int lzo_init(struct crypto_tfm *tfm)
+{
+ struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
+ if (!ctx->lzo_comp_mem)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void lzo_exit(struct crypto_tfm *tfm)
+{
+ struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ vfree(ctx->lzo_comp_mem);
+}
+
+static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+ struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
+ size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
+ int err;
+
+ err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);
+
+ if (err != LZO_E_OK)
+ return -EINVAL;
+
+ *dlen = tmp_len;
+ return 0;
+}
+
+static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+ int err;
+ size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
+
+ err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
+
+ if (err != LZO_E_OK)
+ return -EINVAL;
+
+ *dlen = tmp_len;
+ return 0;
+
+}
+
+static struct crypto_alg alg = {
+ .cra_name = "lzo",
+ .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
+ .cra_ctxsize = sizeof(struct lzo_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(alg.cra_list),
+ .cra_init = lzo_init,
+ .cra_exit = lzo_exit,
+ .cra_u = { .compress = {
+ .coa_compress = lzo_compress,
+ .coa_decompress = lzo_decompress } }
+};
+
+static int __init init(void)
+{
+ return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+ crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LZO Compression Algorithm");
--
1.4.4.4
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