crypto: zlib - New zlib crypto module, using pcomp
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
committed by
Herbert Xu
Herbert Xu
parent
8064efb874
commit
bf68e65ec9
378
crypto/zlib.c
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378
crypto/zlib.c
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/*
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* Cryptographic API.
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*
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* Zlib algorithm
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*
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* Copyright 2008 Sony Corporation
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*
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* Based on deflate.c, which is
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* Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
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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 as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* FIXME: deflate transforms will require up to a total of about 436k of kernel
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* memory on i386 (390k for compression, the rest for decompression), as the
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* current zlib kernel code uses a worst case pre-allocation system by default.
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* This needs to be fixed so that the amount of memory required is properly
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* related to the winbits and memlevel parameters.
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/zlib.h>
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#include <linux/vmalloc.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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#include <linux/slab.h>
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#include <crypto/internal/compress.h>
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#include <net/netlink.h>
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struct zlib_ctx {
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struct z_stream_s comp_stream;
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struct z_stream_s decomp_stream;
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int decomp_windowBits;
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};
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static void zlib_comp_exit(struct zlib_ctx *ctx)
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{
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struct z_stream_s *stream = &ctx->comp_stream;
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if (stream->workspace) {
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zlib_deflateEnd(stream);
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vfree(stream->workspace);
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stream->workspace = NULL;
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}
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}
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static void zlib_decomp_exit(struct zlib_ctx *ctx)
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{
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struct z_stream_s *stream = &ctx->decomp_stream;
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if (stream->workspace) {
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zlib_inflateEnd(stream);
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kfree(stream->workspace);
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stream->workspace = NULL;
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}
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}
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static int zlib_init(struct crypto_tfm *tfm)
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{
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return 0;
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}
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static void zlib_exit(struct crypto_tfm *tfm)
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{
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struct zlib_ctx *ctx = crypto_tfm_ctx(tfm);
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zlib_comp_exit(ctx);
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zlib_decomp_exit(ctx);
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}
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static int zlib_compress_setup(struct crypto_pcomp *tfm, void *params,
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unsigned int len)
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{
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struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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struct z_stream_s *stream = &ctx->comp_stream;
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struct nlattr *tb[ZLIB_COMP_MAX + 1];
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size_t workspacesize;
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int ret;
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ret = nla_parse(tb, ZLIB_COMP_MAX, params, len, NULL);
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if (ret)
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return ret;
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zlib_comp_exit(ctx);
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workspacesize = zlib_deflate_workspacesize();
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stream->workspace = vmalloc(workspacesize);
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if (!stream->workspace)
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return -ENOMEM;
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memset(stream->workspace, 0, workspacesize);
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ret = zlib_deflateInit2(stream,
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tb[ZLIB_COMP_LEVEL]
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? nla_get_u32(tb[ZLIB_COMP_LEVEL])
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: Z_DEFAULT_COMPRESSION,
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tb[ZLIB_COMP_METHOD]
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? nla_get_u32(tb[ZLIB_COMP_METHOD])
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: Z_DEFLATED,
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tb[ZLIB_COMP_WINDOWBITS]
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? nla_get_u32(tb[ZLIB_COMP_WINDOWBITS])
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: MAX_WBITS,
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tb[ZLIB_COMP_MEMLEVEL]
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? nla_get_u32(tb[ZLIB_COMP_MEMLEVEL])
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: DEF_MEM_LEVEL,
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tb[ZLIB_COMP_STRATEGY]
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? nla_get_u32(tb[ZLIB_COMP_STRATEGY])
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: Z_DEFAULT_STRATEGY);
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if (ret != Z_OK) {
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vfree(stream->workspace);
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stream->workspace = NULL;
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return -EINVAL;
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}
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return 0;
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}
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static int zlib_compress_init(struct crypto_pcomp *tfm)
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{
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int ret;
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struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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struct z_stream_s *stream = &dctx->comp_stream;
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ret = zlib_deflateReset(stream);
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if (ret != Z_OK)
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return -EINVAL;
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return 0;
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}
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static int zlib_compress_update(struct crypto_pcomp *tfm,
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struct comp_request *req)
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{
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int ret;
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struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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struct z_stream_s *stream = &dctx->comp_stream;
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pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
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stream->next_in = req->next_in;
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stream->avail_in = req->avail_in;
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stream->next_out = req->next_out;
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stream->avail_out = req->avail_out;
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ret = zlib_deflate(stream, Z_NO_FLUSH);
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switch (ret) {
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case Z_OK:
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break;
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case Z_BUF_ERROR:
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pr_debug("zlib_deflate could not make progress\n");
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return -EAGAIN;
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default:
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pr_debug("zlib_deflate failed %d\n", ret);
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return -EINVAL;
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}
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pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
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stream->avail_in, stream->avail_out,
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req->avail_in - stream->avail_in,
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req->avail_out - stream->avail_out);
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req->next_in = stream->next_in;
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req->avail_in = stream->avail_in;
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req->next_out = stream->next_out;
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req->avail_out = stream->avail_out;
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return 0;
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}
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static int zlib_compress_final(struct crypto_pcomp *tfm,
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struct comp_request *req)
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{
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int ret;
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struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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struct z_stream_s *stream = &dctx->comp_stream;
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pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
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stream->next_in = req->next_in;
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stream->avail_in = req->avail_in;
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stream->next_out = req->next_out;
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stream->avail_out = req->avail_out;
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ret = zlib_deflate(stream, Z_FINISH);
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if (ret != Z_STREAM_END) {
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pr_debug("zlib_deflate failed %d\n", ret);
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return -EINVAL;
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}
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pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
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stream->avail_in, stream->avail_out,
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req->avail_in - stream->avail_in,
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req->avail_out - stream->avail_out);
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req->next_in = stream->next_in;
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req->avail_in = stream->avail_in;
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req->next_out = stream->next_out;
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req->avail_out = stream->avail_out;
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return 0;
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}
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static int zlib_decompress_setup(struct crypto_pcomp *tfm, void *params,
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unsigned int len)
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{
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struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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struct z_stream_s *stream = &ctx->decomp_stream;
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struct nlattr *tb[ZLIB_DECOMP_MAX + 1];
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int ret = 0;
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ret = nla_parse(tb, ZLIB_DECOMP_MAX, params, len, NULL);
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if (ret)
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return ret;
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zlib_decomp_exit(ctx);
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ctx->decomp_windowBits = tb[ZLIB_DECOMP_WINDOWBITS]
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? nla_get_u32(tb[ZLIB_DECOMP_WINDOWBITS])
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: DEF_WBITS;
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stream->workspace = kzalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
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if (!stream->workspace)
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return -ENOMEM;
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ret = zlib_inflateInit2(stream, ctx->decomp_windowBits);
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if (ret != Z_OK) {
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kfree(stream->workspace);
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stream->workspace = NULL;
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return -EINVAL;
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}
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return 0;
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}
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static int zlib_decompress_init(struct crypto_pcomp *tfm)
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{
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int ret;
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struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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struct z_stream_s *stream = &dctx->decomp_stream;
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ret = zlib_inflateReset(stream);
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if (ret != Z_OK)
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return -EINVAL;
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return 0;
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}
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static int zlib_decompress_update(struct crypto_pcomp *tfm,
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struct comp_request *req)
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{
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int ret;
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struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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struct z_stream_s *stream = &dctx->decomp_stream;
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pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
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stream->next_in = req->next_in;
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stream->avail_in = req->avail_in;
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stream->next_out = req->next_out;
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stream->avail_out = req->avail_out;
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ret = zlib_inflate(stream, Z_SYNC_FLUSH);
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switch (ret) {
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case Z_OK:
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case Z_STREAM_END:
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break;
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case Z_BUF_ERROR:
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pr_debug("zlib_inflate could not make progress\n");
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return -EAGAIN;
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default:
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pr_debug("zlib_inflate failed %d\n", ret);
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return -EINVAL;
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}
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pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
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stream->avail_in, stream->avail_out,
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req->avail_in - stream->avail_in,
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req->avail_out - stream->avail_out);
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req->next_in = stream->next_in;
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req->avail_in = stream->avail_in;
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req->next_out = stream->next_out;
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req->avail_out = stream->avail_out;
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return 0;
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}
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static int zlib_decompress_final(struct crypto_pcomp *tfm,
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struct comp_request *req)
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{
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int ret;
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struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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struct z_stream_s *stream = &dctx->decomp_stream;
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pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
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stream->next_in = req->next_in;
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stream->avail_in = req->avail_in;
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stream->next_out = req->next_out;
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stream->avail_out = req->avail_out;
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if (dctx->decomp_windowBits < 0) {
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ret = zlib_inflate(stream, Z_SYNC_FLUSH);
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/*
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* Work around a bug in zlib, which sometimes wants to taste an
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* extra byte when being used in the (undocumented) raw deflate
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* mode. (From USAGI).
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*/
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if (ret == Z_OK && !stream->avail_in && stream->avail_out) {
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const void *saved_next_in = stream->next_in;
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u8 zerostuff = 0;
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stream->next_in = &zerostuff;
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stream->avail_in = 1;
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ret = zlib_inflate(stream, Z_FINISH);
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stream->next_in = saved_next_in;
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stream->avail_in = 0;
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}
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} else
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ret = zlib_inflate(stream, Z_FINISH);
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if (ret != Z_STREAM_END) {
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pr_debug("zlib_inflate failed %d\n", ret);
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return -EINVAL;
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}
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pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
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stream->avail_in, stream->avail_out,
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req->avail_in - stream->avail_in,
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req->avail_out - stream->avail_out);
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req->next_in = stream->next_in;
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req->avail_in = stream->avail_in;
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req->next_out = stream->next_out;
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req->avail_out = stream->avail_out;
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return 0;
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}
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static struct pcomp_alg zlib_alg = {
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.compress_setup = zlib_compress_setup,
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.compress_init = zlib_compress_init,
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.compress_update = zlib_compress_update,
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.compress_final = zlib_compress_final,
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.decompress_setup = zlib_decompress_setup,
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.decompress_init = zlib_decompress_init,
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.decompress_update = zlib_decompress_update,
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.decompress_final = zlib_decompress_final,
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.base = {
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.cra_name = "zlib",
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.cra_flags = CRYPTO_ALG_TYPE_PCOMPRESS,
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.cra_ctxsize = sizeof(struct zlib_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = zlib_init,
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.cra_exit = zlib_exit,
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}
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};
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static int __init zlib_mod_init(void)
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{
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return crypto_register_pcomp(&zlib_alg);
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}
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static void __exit zlib_mod_fini(void)
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{
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crypto_unregister_pcomp(&zlib_alg);
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}
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module_init(zlib_mod_init);
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module_exit(zlib_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Zlib Compression Algorithm");
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MODULE_AUTHOR("Sony Corporation");
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