[CRYPTO] lzo: Add LZO compression algorithm support

Add LZO compression algorithm support

Signed-off-by: Zoltan Sogor <weth@inf.u-szeged.hu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

5 files changed, 205 insertions, 1 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 40ae92c..4fd14e4 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -536,6 +536,14 @@ 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 957343c..83532ac 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -55,6 +55,7 @@ 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");
diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index c8d3e60..943a514 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -84,7 +84,7 @@ static char *check[] = {
 	"cast6", "arc4", "michael_mic", "deflate", "crc32c", "tea", "xtea",
 	"arc4", "michael_mic", "deflate", "crc32c", "tea", "xtea",
 	"khazad", "wp512", "wp384", "wp256", "tnepres", "xeta",  "fcrypt",
-	"camellia", "seed", "salsa20", NULL
+	"camellia", "seed", "salsa20", "lzo", NULL
 };
 
 static void hexdump(unsigned char *buf, unsigned int len)
@@ -1292,6 +1292,8 @@ static void do_test(void)
 		test_comp("deflate", deflate_comp_tv_template,
 			  deflate_decomp_tv_template, DEFLATE_COMP_TEST_VECTORS,
 			  DEFLATE_DECOMP_TEST_VECTORS);
+		test_comp("lzo", lzo_comp_tv_template, lzo_decomp_tv_template,
+			  LZO_COMP_TEST_VECTORS, LZO_DECOMP_TEST_VECTORS);
 		test_hash("crc32c", crc32c_tv_template, CRC32C_TEST_VECTORS);
 		test_hash("hmac(md5)", hmac_md5_tv_template,
 			  HMAC_MD5_TEST_VECTORS);
@@ -1550,6 +1552,11 @@ static void do_test(void)
 			  AES_GCM_DEC_TEST_VECTORS);
 		break;
 
+	case 36:
+		test_comp("lzo", lzo_comp_tv_template, lzo_decomp_tv_template,
+			  LZO_COMP_TEST_VECTORS, LZO_DECOMP_TEST_VECTORS);
+		break;
+
 	case 100:
 		test_hash("hmac(md5)", hmac_md5_tv_template,
 			  HMAC_MD5_TEST_VECTORS);
diff --git a/crypto/tcrypt.h b/crypto/tcrypt.h
index d3c380f..175f26a 100644
--- a/crypto/tcrypt.h
+++ b/crypto/tcrypt.h
@@ -7461,6 +7461,88 @@ static struct comp_testvec deflate_decomp_tv_template[] = {
 };
 
 /*
+ * LZO test vectors (null-terminated strings).
+ */
+#define LZO_COMP_TEST_VECTORS 2
+#define LZO_DECOMP_TEST_VECTORS 2
+
+static struct comp_testvec lzo_comp_tv_template[] = {
+	{
+		.inlen	= 70,
+		.outlen	= 46,
+		.input	= "Join us now and share the software "
+			  "Join us now and share the software ",
+		.output	= {  0x00, 0x0d, 0x4a, 0x6f, 0x69, 0x6e, 0x20, 0x75,
+			     0x73, 0x20, 0x6e, 0x6f, 0x77, 0x20, 0x61, 0x6e,
+			     0x64, 0x20, 0x73, 0x68, 0x61, 0x72, 0x65, 0x20,
+			     0x74, 0x68, 0x65, 0x20, 0x73, 0x6f, 0x66, 0x74,
+			     0x77, 0x70, 0x01, 0x01, 0x4a, 0x6f, 0x69, 0x6e,
+			     0x3d, 0x88, 0x00, 0x11, 0x00, 0x00 },
+	}, {
+		.inlen	= 159,
+		.outlen	= 133,
+		.input	= "This document describes a compression method based on the LZO "
+			  "compression algorithm.  This document defines the application of "
+			  "the LZO algorithm used in UBIFS.",
+		.output	= { 0x00, 0x2b, 0x54, 0x68, 0x69, 0x73, 0x20, 0x64,
+			    0x6f, 0x63, 0x75, 0x6d, 0x65, 0x6e, 0x74, 0x20,
+			    0x64, 0x65, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65,
+			    0x73, 0x20, 0x61, 0x20, 0x63, 0x6f, 0x6d, 0x70,
+			    0x72, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x20,
+			    0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x20, 0x62,
+			    0x61, 0x73, 0x65, 0x64, 0x20, 0x6f, 0x6e, 0x20,
+			    0x74, 0x68, 0x65, 0x20, 0x4c, 0x5a, 0x4f, 0x2b,
+			    0x8c, 0x00, 0x0d, 0x61, 0x6c, 0x67, 0x6f, 0x72,
+			    0x69, 0x74, 0x68, 0x6d, 0x2e, 0x20, 0x20, 0x54,
+			    0x68, 0x69, 0x73, 0x2a, 0x54, 0x01, 0x02, 0x66,
+			    0x69, 0x6e, 0x65, 0x73, 0x94, 0x06, 0x05, 0x61,
+			    0x70, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x76,
+			    0x0a, 0x6f, 0x66, 0x88, 0x02, 0x60, 0x09, 0x27,
+			    0xf0, 0x00, 0x0c, 0x20, 0x75, 0x73, 0x65, 0x64,
+			    0x20, 0x69, 0x6e, 0x20, 0x55, 0x42, 0x49, 0x46,
+			    0x53, 0x2e, 0x11, 0x00, 0x00 },
+	},
+};
+
+static struct comp_testvec lzo_decomp_tv_template[] = {
+	{
+		.inlen	= 133,
+		.outlen	= 159,
+		.input	= { 0x00, 0x2b, 0x54, 0x68, 0x69, 0x73, 0x20, 0x64,
+			    0x6f, 0x63, 0x75, 0x6d, 0x65, 0x6e, 0x74, 0x20,
+			    0x64, 0x65, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65,
+			    0x73, 0x20, 0x61, 0x20, 0x63, 0x6f, 0x6d, 0x70,
+			    0x72, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x20,
+			    0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x20, 0x62,
+			    0x61, 0x73, 0x65, 0x64, 0x20, 0x6f, 0x6e, 0x20,
+			    0x74, 0x68, 0x65, 0x20, 0x4c, 0x5a, 0x4f, 0x2b,
+			    0x8c, 0x00, 0x0d, 0x61, 0x6c, 0x67, 0x6f, 0x72,
+			    0x69, 0x74, 0x68, 0x6d, 0x2e, 0x20, 0x20, 0x54,
+			    0x68, 0x69, 0x73, 0x2a, 0x54, 0x01, 0x02, 0x66,
+			    0x69, 0x6e, 0x65, 0x73, 0x94, 0x06, 0x05, 0x61,
+			    0x70, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x76,
+			    0x0a, 0x6f, 0x66, 0x88, 0x02, 0x60, 0x09, 0x27,
+			    0xf0, 0x00, 0x0c, 0x20, 0x75, 0x73, 0x65, 0x64,
+			    0x20, 0x69, 0x6e, 0x20, 0x55, 0x42, 0x49, 0x46,
+			    0x53, 0x2e, 0x11, 0x00, 0x00 },
+		.output	= "This document describes a compression method based on the LZO "
+			  "compression algorithm.  This document defines the application of "
+			  "the LZO algorithm used in UBIFS.",
+	}, {
+		.inlen	= 46,
+		.outlen	= 70,
+		.input	= { 0x00, 0x0d, 0x4a, 0x6f, 0x69, 0x6e, 0x20, 0x75,
+			    0x73, 0x20, 0x6e, 0x6f, 0x77, 0x20, 0x61, 0x6e,
+			    0x64, 0x20, 0x73, 0x68, 0x61, 0x72, 0x65, 0x20,
+			    0x74, 0x68, 0x65, 0x20, 0x73, 0x6f, 0x66, 0x74,
+			    0x77, 0x70, 0x01, 0x01, 0x4a, 0x6f, 0x69, 0x6e,
+			    0x3d, 0x88, 0x00, 0x11, 0x00, 0x00 },
+		.output	= "Join us now and share the software "
+			  "Join us now and share the software ",
+	},
+};
+
+/*
  * Michael MIC test vectors from IEEE 802.11i
  */
 #define MICHAEL_MIC_TEST_VECTORS 6