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@@ -0,0 +1,146 @@
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+--- a/crypto/Kconfig
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++++ b/crypto/Kconfig
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+@@ -886,6 +886,13 @@ config CRYPTO_LZO
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+ help
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+ This is the LZO algorithm.
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+
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++config CRYPTO_XZ
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++ tristate "XZ compression algorithm"
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++ select CRYPTO_ALGAPI
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++ select XZ_DEC
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++ help
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++ This is the XZ algorithm. Only decompression is supported for now.
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++
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+ comment "Random Number Generation"
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+
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+ config CRYPTO_ANSI_CPRNG
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+--- a/crypto/Makefile
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++++ b/crypto/Makefile
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+@@ -82,6 +82,7 @@ obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += mich
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+ obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
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+ obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o
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+ obj-$(CONFIG_CRYPTO_LZO) += lzo.o
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++obj-$(CONFIG_CRYPTO_XZ) += xz.o
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+ obj-$(CONFIG_CRYPTO_RNG2) += rng.o
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+ obj-$(CONFIG_CRYPTO_RNG2) += krng.o
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+ obj-$(CONFIG_CRYPTO_ANSI_CPRNG) += ansi_cprng.o
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+--- /dev/null
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++++ b/crypto/xz.c
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+@@ -0,0 +1,117 @@
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++/*
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++ * Cryptographic API.
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++ *
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++ * XZ decompression support.
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++ *
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++ * Copyright (c) 2012 Gabor Juhos <[email protected]>
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++ *
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++ * This program is free software; you can redistribute it and/or modify it
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++ * under the terms of the GNU General Public License version 2 as published by
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++ * the Free Software Foundation.
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++ *
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++ */
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++#include <linux/init.h>
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++#include <linux/module.h>
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++#include <linux/crypto.h>
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++#include <linux/xz.h>
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++#include <linux/interrupt.h>
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++#include <linux/mm.h>
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++#include <linux/net.h>
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++
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++struct xz_comp_ctx {
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++ struct xz_dec *decomp_state;
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++ struct xz_buf decomp_buf;
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++};
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++
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++static int crypto_xz_decomp_init(struct xz_comp_ctx *ctx)
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++{
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++ ctx->decomp_state = xz_dec_init(XZ_SINGLE, 0);
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++ if (!ctx->decomp_state)
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++ return -ENOMEM;
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++
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++ return 0;
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++}
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++
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++static void crypto_xz_decomp_exit(struct xz_comp_ctx *ctx)
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++{
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++ xz_dec_end(ctx->decomp_state);
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++}
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++
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++static int crypto_xz_init(struct crypto_tfm *tfm)
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++{
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++ struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
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++
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++ return crypto_xz_decomp_init(ctx);
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++}
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++
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++static void crypto_xz_exit(struct crypto_tfm *tfm)
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++{
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++ struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
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++
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++ crypto_xz_decomp_exit(ctx);
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++}
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++
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++static int crypto_xz_compress(struct crypto_tfm *tfm, const u8 *src,
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++ unsigned int slen, u8 *dst, unsigned int *dlen)
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++{
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++ return -EOPNOTSUPP;
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++}
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++
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++static int crypto_xz_decompress(struct crypto_tfm *tfm, const u8 *src,
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++ unsigned int slen, u8 *dst, unsigned int *dlen)
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++{
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++ struct xz_comp_ctx *dctx = crypto_tfm_ctx(tfm);
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++ struct xz_buf *xz_buf = &dctx->decomp_buf;
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++ int ret;
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++
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++ memset(xz_buf, '\0', sizeof(struct xz_buf));
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++
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++ xz_buf->in = (u8 *) src;
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++ xz_buf->in_pos = 0;
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++ xz_buf->in_size = slen;
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++ xz_buf->out = (u8 *) dst;
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++ xz_buf->out_pos = 0;
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++ xz_buf->out_size = *dlen;
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++
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++ ret = xz_dec_run(dctx->decomp_state, xz_buf);
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++ if (ret != XZ_STREAM_END) {
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++ ret = -EINVAL;
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++ goto out;
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++ }
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++
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++ *dlen = xz_buf->out_pos;
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++ ret = 0;
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++
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++out:
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++ return ret;
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++}
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++
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++static struct crypto_alg crypto_xz_alg = {
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++ .cra_name = "xz",
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++ .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
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++ .cra_ctxsize = sizeof(struct xz_comp_ctx),
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++ .cra_module = THIS_MODULE,
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++ .cra_list = LIST_HEAD_INIT(crypto_xz_alg.cra_list),
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++ .cra_init = crypto_xz_init,
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++ .cra_exit = crypto_xz_exit,
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++ .cra_u = { .compress = {
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++ .coa_compress = crypto_xz_compress,
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++ .coa_decompress = crypto_xz_decompress } }
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++};
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++
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++static int __init crypto_xz_mod_init(void)
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++{
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++ return crypto_register_alg(&crypto_xz_alg);
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++}
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++
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++static void __exit crypto_xz_mod_exit(void)
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++{
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++ crypto_unregister_alg(&crypto_xz_alg);
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++}
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++
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++module_init(crypto_xz_mod_init);
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++module_exit(crypto_xz_mod_exit);
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++
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++MODULE_LICENSE("GPL v2");
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++MODULE_DESCRIPTION("Crypto XZ decompression support");
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++MODULE_AUTHOR("Gabor Juhos <[email protected]>");
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Gabor Juhos