linux/3.2: add XZ decompressor support to crypto

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30792 3c298f89-4303-0410-b956-a3cf2f4a3e73

3 files changed, 149 insertions, 2 deletions

diff --git a/target/linux/generic/config-3.2 b/target/linux/generic/config-3.2
index a44ebe7d4..c4be769cd 100644
--- a/target/linux/generic/config-3.2
+++ b/target/linux/generic/config-3.2
@@ -487,6 +487,7 @@ CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=y
 # CONFIG_CRYPTO_WP512 is not set
 # CONFIG_CRYPTO_XCBC is not set
 # CONFIG_CRYPTO_XTS is not set
+# CONFIG_CRYPTO_XZ is not set
 # CONFIG_CRYPTO_ZLIB is not set
 # CONFIG_CRYSTALHD is not set
 # CONFIG_CS5535_MFGPT is not set
diff --git a/target/linux/generic/patches-3.2/540-crypto-xz-decompression-support.patch b/target/linux/generic/patches-3.2/540-crypto-xz-decompression-support.patch
new file mode 100644
index 000000000..e6e0a730a
--- /dev/null
+++ b/target/linux/generic/patches-3.2/540-crypto-xz-decompression-support.patch
@@ -0,0 +1,146 @@
+--- a/crypto/Kconfig
++++ b/crypto/Kconfig
+@@ -886,6 +886,13 @@ config CRYPTO_LZO
+ 	help
+ 	  This is the LZO algorithm.
+ 
++config CRYPTO_XZ
++	tristate "XZ compression algorithm"
++	select CRYPTO_ALGAPI
++	select XZ_DEC
++	help
++	  This is the XZ algorithm. Only decompression is supported for now.
++
+ comment "Random Number Generation"
+ 
+ config CRYPTO_ANSI_CPRNG
+--- a/crypto/Makefile
++++ b/crypto/Makefile
+@@ -82,6 +82,7 @@ obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += mich
+ obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
+ obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o
+ obj-$(CONFIG_CRYPTO_LZO) += lzo.o
++obj-$(CONFIG_CRYPTO_XZ) += xz.o
+ obj-$(CONFIG_CRYPTO_RNG2) += rng.o
+ obj-$(CONFIG_CRYPTO_RNG2) += krng.o
+ obj-$(CONFIG_CRYPTO_ANSI_CPRNG) += ansi_cprng.o
+--- /dev/null
++++ b/crypto/xz.c
+@@ -0,0 +1,117 @@
++/*
++ * Cryptographic API.
++ *
++ * XZ decompression support.
++ *
++ * Copyright (c) 2012 Gabor Juhos <juhosg@openwrt.org>
++ *
++ * 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.
++ *
++ */
++#include <linux/init.h>
++#include <linux/module.h>
++#include <linux/crypto.h>
++#include <linux/xz.h>
++#include <linux/interrupt.h>
++#include <linux/mm.h>
++#include <linux/net.h>
++
++struct xz_comp_ctx {
++	struct xz_dec	*decomp_state;
++	struct xz_buf	decomp_buf;
++};
++
++static int crypto_xz_decomp_init(struct xz_comp_ctx *ctx)
++{
++	ctx->decomp_state = xz_dec_init(XZ_SINGLE, 0);
++	if (!ctx->decomp_state)
++		return -ENOMEM;
++
++	return 0;
++}
++
++static void crypto_xz_decomp_exit(struct xz_comp_ctx *ctx)
++{
++	xz_dec_end(ctx->decomp_state);
++}
++
++static int crypto_xz_init(struct crypto_tfm *tfm)
++{
++	struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
++
++	return crypto_xz_decomp_init(ctx);
++}
++
++static void crypto_xz_exit(struct crypto_tfm *tfm)
++{
++	struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
++
++	crypto_xz_decomp_exit(ctx);
++}
++
++static int crypto_xz_compress(struct crypto_tfm *tfm, const u8 *src,
++			      unsigned int slen, u8 *dst, unsigned int *dlen)
++{
++	return -EOPNOTSUPP;
++}
++
++static int crypto_xz_decompress(struct crypto_tfm *tfm, const u8 *src,
++				unsigned int slen, u8 *dst, unsigned int *dlen)
++{
++	struct xz_comp_ctx *dctx = crypto_tfm_ctx(tfm);
++	struct xz_buf *xz_buf = &dctx->decomp_buf;
++	int ret;
++
++	memset(xz_buf, '\0', sizeof(struct xz_buf));
++
++	xz_buf->in = (u8 *) src;
++	xz_buf->in_pos = 0;
++	xz_buf->in_size = slen;
++	xz_buf->out = (u8 *) dst;
++	xz_buf->out_pos = 0;
++	xz_buf->out_size = *dlen;
++
++	ret = xz_dec_run(dctx->decomp_state, xz_buf);
++	if (ret != XZ_STREAM_END) {
++		ret = -EINVAL;
++		goto out;
++	}
++
++	*dlen = xz_buf->out_pos;
++	ret = 0;
++
++out:
++	return ret;
++}
++
++static struct crypto_alg crypto_xz_alg = {
++	.cra_name		= "xz",
++	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
++	.cra_ctxsize		= sizeof(struct xz_comp_ctx),
++	.cra_module		= THIS_MODULE,
++	.cra_list		= LIST_HEAD_INIT(crypto_xz_alg.cra_list),
++	.cra_init		= crypto_xz_init,
++	.cra_exit		= crypto_xz_exit,
++	.cra_u			= { .compress = {
++	.coa_compress 		= crypto_xz_compress,
++	.coa_decompress  	= crypto_xz_decompress } }
++};
++
++static int __init crypto_xz_mod_init(void)
++{
++	return crypto_register_alg(&crypto_xz_alg);
++}
++
++static void __exit crypto_xz_mod_exit(void)
++{
++	crypto_unregister_alg(&crypto_xz_alg);
++}
++
++module_init(crypto_xz_mod_init);
++module_exit(crypto_xz_mod_exit);
++
++MODULE_LICENSE("GPL v2");
++MODULE_DESCRIPTION("Crypto XZ decompression support");
++MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
diff --git a/target/linux/generic/patches-3.2/940-ocf_kbuild_integration.patch b/target/linux/generic/patches-3.2/940-ocf_kbuild_integration.patch
index f22bd4ccd..8108e3e48 100644
--- a/target/linux/generic/patches-3.2/940-ocf_kbuild_integration.patch
+++ b/target/linux/generic/patches-3.2/940-ocf_kbuild_integration.patch
@@ -1,6 +1,6 @@
 --- a/crypto/Kconfig
 +++ b/crypto/Kconfig
-@@ -923,3 +923,6 @@ config CRYPTO_USER_API_SKCIPHER
+@@ -930,3 +930,6 @@ config CRYPTO_USER_API_SKCIPHER
  source "drivers/crypto/Kconfig"
  
  endif	# if CRYPTO
@@ -9,7 +9,7 @@
 +
 --- a/crypto/Makefile
 +++ b/crypto/Makefile
-@@ -91,6 +91,8 @@ obj-$(CONFIG_CRYPTO_USER_API) += af_alg.
+@@ -92,6 +92,8 @@ obj-$(CONFIG_CRYPTO_USER_API) += af_alg.
  obj-$(CONFIG_CRYPTO_USER_API_HASH) += algif_hash.o
  obj-$(CONFIG_CRYPTO_USER_API_SKCIPHER) += algif_skcipher.o