diff options
Diffstat (limited to 'target/linux/generic/patches-4.3/540-crypto-xz-decompression-support.patch')
| -rw-r--r-- | target/linux/generic/patches-4.3/540-crypto-xz-decompression-support.patch | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.3/540-crypto-xz-decompression-support.patch b/target/linux/generic/patches-4.3/540-crypto-xz-decompression-support.patch new file mode 100644 index 0000000000..4e385b6389 --- /dev/null +++ b/target/linux/generic/patches-4.3/540-crypto-xz-decompression-support.patch @@ -0,0 +1,146 @@ +--- a/crypto/Kconfig ++++ b/crypto/Kconfig +@@ -1536,6 +1536,13 @@ 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 +@@ -103,6 +103,7 @@ 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_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>"); |