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- --- a/crypto/Kconfig
- +++ b/crypto/Kconfig
- @@ -1437,6 +1437,13 @@ config CRYPTO_LZ4HC
- help
- This is the LZ4 high compression mode 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
- @@ -91,6 +91,7 @@ obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.
- obj-$(CONFIG_CRYPTO_LZO) += lzo.o
- obj-$(CONFIG_CRYPTO_LZ4) += lz4.o
- obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o
- +obj-$(CONFIG_CRYPTO_XZ) += xz.o
- obj-$(CONFIG_CRYPTO_842) += 842.o
- obj-$(CONFIG_CRYPTO_RNG2) += rng.o
- obj-$(CONFIG_CRYPTO_RNG2) += krng.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>");
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