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crypto: zlib - New zlib crypto module, using pcomp

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Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Geert Uytterhoeven 2009-03-04 15:15:49 +08:00 committed by Herbert Xu
parent 8064efb874
commit bf68e65ec9
4 changed files with 408 additions and 0 deletions
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9
crypto/Kconfig
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@ -748,6 +748,15 @@ config CRYPTO_DEFLATE
You will most probably want this if using IPSec.
config CRYPTO_ZLIB
tristate "Zlib compression algorithm"
select CRYPTO_PCOMP
select ZLIB_INFLATE
select ZLIB_DEFLATE
select NLATTR
help
This is the zlib algorithm.
config CRYPTO_LZO
tristate "LZO compression algorithm"
select CRYPTO_ALGAPI

1
crypto/Makefile
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@ -74,6 +74,7 @@ obj-$(CONFIG_CRYPTO_ANUBIS) += anubis.o
obj-$(CONFIG_CRYPTO_SEED) += seed.o
obj-$(CONFIG_CRYPTO_SALSA20) += salsa20_generic.o
obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
obj-$(CONFIG_CRYPTO_ZLIB) += zlib.o
obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o

378
crypto/zlib.c Normal file
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@ -0,0 +1,378 @@
/*
* Cryptographic API.
*
* Zlib algorithm
*
* Copyright 2008 Sony Corporation
*
* Based on deflate.c, which is
* Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* FIXME: deflate transforms will require up to a total of about 436k of kernel
* memory on i386 (390k for compression, the rest for decompression), as the
* current zlib kernel code uses a worst case pre-allocation system by default.
* This needs to be fixed so that the amount of memory required is properly
* related to the winbits and memlevel parameters.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/init.h>
#include <linux/module.h>
#include <linux/zlib.h>
#include <linux/vmalloc.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <crypto/internal/compress.h>
#include <net/netlink.h>
struct zlib_ctx {
struct z_stream_s comp_stream;
struct z_stream_s decomp_stream;
int decomp_windowBits;
};
static void zlib_comp_exit(struct zlib_ctx *ctx)
{
struct z_stream_s *stream = &ctx->comp_stream;
if (stream->workspace) {
zlib_deflateEnd(stream);
vfree(stream->workspace);
stream->workspace = NULL;
}
}
static void zlib_decomp_exit(struct zlib_ctx *ctx)
{
struct z_stream_s *stream = &ctx->decomp_stream;
if (stream->workspace) {
zlib_inflateEnd(stream);
kfree(stream->workspace);
stream->workspace = NULL;
}
}
static int zlib_init(struct crypto_tfm *tfm)
{
return 0;
}
static void zlib_exit(struct crypto_tfm *tfm)
{
struct zlib_ctx *ctx = crypto_tfm_ctx(tfm);
zlib_comp_exit(ctx);
zlib_decomp_exit(ctx);
}
static int zlib_compress_setup(struct crypto_pcomp *tfm, void *params,
unsigned int len)
{
struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &ctx->comp_stream;
struct nlattr *tb[ZLIB_COMP_MAX + 1];
size_t workspacesize;
int ret;
ret = nla_parse(tb, ZLIB_COMP_MAX, params, len, NULL);
if (ret)
return ret;
zlib_comp_exit(ctx);
workspacesize = zlib_deflate_workspacesize();
stream->workspace = vmalloc(workspacesize);
if (!stream->workspace)
return -ENOMEM;
memset(stream->workspace, 0, workspacesize);
ret = zlib_deflateInit2(stream,
tb[ZLIB_COMP_LEVEL]
? nla_get_u32(tb[ZLIB_COMP_LEVEL])
: Z_DEFAULT_COMPRESSION,
tb[ZLIB_COMP_METHOD]
? nla_get_u32(tb[ZLIB_COMP_METHOD])
: Z_DEFLATED,
tb[ZLIB_COMP_WINDOWBITS]
? nla_get_u32(tb[ZLIB_COMP_WINDOWBITS])
: MAX_WBITS,
tb[ZLIB_COMP_MEMLEVEL]
? nla_get_u32(tb[ZLIB_COMP_MEMLEVEL])
: DEF_MEM_LEVEL,
tb[ZLIB_COMP_STRATEGY]
? nla_get_u32(tb[ZLIB_COMP_STRATEGY])
: Z_DEFAULT_STRATEGY);
if (ret != Z_OK) {
vfree(stream->workspace);
stream->workspace = NULL;
return -EINVAL;
}
return 0;
}
static int zlib_compress_init(struct crypto_pcomp *tfm)
{
int ret;
struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &dctx->comp_stream;
ret = zlib_deflateReset(stream);
if (ret != Z_OK)
return -EINVAL;
return 0;
}
static int zlib_compress_update(struct crypto_pcomp *tfm,
struct comp_request *req)
{
int ret;
struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &dctx->comp_stream;
pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
stream->next_in = req->next_in;
stream->avail_in = req->avail_in;
stream->next_out = req->next_out;
stream->avail_out = req->avail_out;
ret = zlib_deflate(stream, Z_NO_FLUSH);
switch (ret) {
case Z_OK:
break;
case Z_BUF_ERROR:
pr_debug("zlib_deflate could not make progress\n");
return -EAGAIN;
default:
pr_debug("zlib_deflate failed %d\n", ret);
return -EINVAL;
}
pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
stream->avail_in, stream->avail_out,
req->avail_in - stream->avail_in,
req->avail_out - stream->avail_out);
req->next_in = stream->next_in;
req->avail_in = stream->avail_in;
req->next_out = stream->next_out;
req->avail_out = stream->avail_out;
return 0;
}
static int zlib_compress_final(struct crypto_pcomp *tfm,
struct comp_request *req)
{
int ret;
struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &dctx->comp_stream;
pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
stream->next_in = req->next_in;
stream->avail_in = req->avail_in;
stream->next_out = req->next_out;
stream->avail_out = req->avail_out;
ret = zlib_deflate(stream, Z_FINISH);
if (ret != Z_STREAM_END) {
pr_debug("zlib_deflate failed %d\n", ret);
return -EINVAL;
}
pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
stream->avail_in, stream->avail_out,
req->avail_in - stream->avail_in,
req->avail_out - stream->avail_out);
req->next_in = stream->next_in;
req->avail_in = stream->avail_in;
req->next_out = stream->next_out;
req->avail_out = stream->avail_out;
return 0;
}
static int zlib_decompress_setup(struct crypto_pcomp *tfm, void *params,
unsigned int len)
{
struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &ctx->decomp_stream;
struct nlattr *tb[ZLIB_DECOMP_MAX + 1];
int ret = 0;
ret = nla_parse(tb, ZLIB_DECOMP_MAX, params, len, NULL);
if (ret)
return ret;
zlib_decomp_exit(ctx);
ctx->decomp_windowBits = tb[ZLIB_DECOMP_WINDOWBITS]
? nla_get_u32(tb[ZLIB_DECOMP_WINDOWBITS])
: DEF_WBITS;
stream->workspace = kzalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
if (!stream->workspace)
return -ENOMEM;
ret = zlib_inflateInit2(stream, ctx->decomp_windowBits);
if (ret != Z_OK) {
kfree(stream->workspace);
stream->workspace = NULL;
return -EINVAL;
}
return 0;
}
static int zlib_decompress_init(struct crypto_pcomp *tfm)
{
int ret;
struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &dctx->decomp_stream;
ret = zlib_inflateReset(stream);
if (ret != Z_OK)
return -EINVAL;
return 0;
}
static int zlib_decompress_update(struct crypto_pcomp *tfm,
struct comp_request *req)
{
int ret;
struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &dctx->decomp_stream;
pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
stream->next_in = req->next_in;
stream->avail_in = req->avail_in;
stream->next_out = req->next_out;
stream->avail_out = req->avail_out;
ret = zlib_inflate(stream, Z_SYNC_FLUSH);
switch (ret) {
case Z_OK:
case Z_STREAM_END:
break;
case Z_BUF_ERROR:
pr_debug("zlib_inflate could not make progress\n");
return -EAGAIN;
default:
pr_debug("zlib_inflate failed %d\n", ret);
return -EINVAL;
}
pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
stream->avail_in, stream->avail_out,
req->avail_in - stream->avail_in,
req->avail_out - stream->avail_out);
req->next_in = stream->next_in;
req->avail_in = stream->avail_in;
req->next_out = stream->next_out;
req->avail_out = stream->avail_out;
return 0;
}
static int zlib_decompress_final(struct crypto_pcomp *tfm,
struct comp_request *req)
{
int ret;
struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &dctx->decomp_stream;
pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
stream->next_in = req->next_in;
stream->avail_in = req->avail_in;
stream->next_out = req->next_out;
stream->avail_out = req->avail_out;
if (dctx->decomp_windowBits < 0) {
ret = zlib_inflate(stream, Z_SYNC_FLUSH);
/*
* Work around a bug in zlib, which sometimes wants to taste an
* extra byte when being used in the (undocumented) raw deflate
* mode. (From USAGI).
*/
if (ret == Z_OK && !stream->avail_in && stream->avail_out) {
const void *saved_next_in = stream->next_in;
u8 zerostuff = 0;
stream->next_in = &zerostuff;
stream->avail_in = 1;
ret = zlib_inflate(stream, Z_FINISH);
stream->next_in = saved_next_in;
stream->avail_in = 0;
}
} else
ret = zlib_inflate(stream, Z_FINISH);
if (ret != Z_STREAM_END) {
pr_debug("zlib_inflate failed %d\n", ret);
return -EINVAL;
}
pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
stream->avail_in, stream->avail_out,
req->avail_in - stream->avail_in,
req->avail_out - stream->avail_out);
req->next_in = stream->next_in;
req->avail_in = stream->avail_in;
req->next_out = stream->next_out;
req->avail_out = stream->avail_out;
return 0;
}
static struct pcomp_alg zlib_alg = {
.compress_setup = zlib_compress_setup,
.compress_init = zlib_compress_init,
.compress_update = zlib_compress_update,
.compress_final = zlib_compress_final,
.decompress_setup = zlib_decompress_setup,
.decompress_init = zlib_decompress_init,
.decompress_update = zlib_decompress_update,
.decompress_final = zlib_decompress_final,
.base = {
.cra_name = "zlib",
.cra_flags = CRYPTO_ALG_TYPE_PCOMPRESS,
.cra_ctxsize = sizeof(struct zlib_ctx),
.cra_module = THIS_MODULE,
.cra_init = zlib_init,
.cra_exit = zlib_exit,
}
};
static int __init zlib_mod_init(void)
{
return crypto_register_pcomp(&zlib_alg);
}
static void __exit zlib_mod_fini(void)
{
crypto_unregister_pcomp(&zlib_alg);
}
module_init(zlib_mod_init);
module_exit(zlib_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Zlib Compression Algorithm");
MODULE_AUTHOR("Sony Corporation");

20
include/crypto/compress.h
View File

@ -30,6 +30,26 @@ struct comp_request {
unsigned int avail_out; /* bytes available at next_out */
};
enum zlib_comp_params {
ZLIB_COMP_LEVEL = 1, /* e.g. Z_DEFAULT_COMPRESSION */
ZLIB_COMP_METHOD, /* e.g. Z_DEFLATED */
ZLIB_COMP_WINDOWBITS, /* e.g. MAX_WBITS */
ZLIB_COMP_MEMLEVEL, /* e.g. DEF_MEM_LEVEL */
ZLIB_COMP_STRATEGY, /* e.g. Z_DEFAULT_STRATEGY */
__ZLIB_COMP_MAX,
};
#define ZLIB_COMP_MAX (__ZLIB_COMP_MAX - 1)
enum zlib_decomp_params {
ZLIB_DECOMP_WINDOWBITS = 1, /* e.g. DEF_WBITS */
__ZLIB_DECOMP_MAX,
};
#define ZLIB_DECOMP_MAX (__ZLIB_DECOMP_MAX - 1)
struct crypto_pcomp {
struct crypto_tfm base;
};