147 lines
3.5 KiB
Diff
147 lines
3.5 KiB
Diff
--- a/crypto/Kconfig
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+++ b/crypto/Kconfig
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@@ -924,6 +924,13 @@ config CRYPTO_LZO
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help
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This is the LZO algorithm.
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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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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 <juhosg@openwrt.org>
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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 <juhosg@openwrt.org>");
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