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>
diff --git a/crypto/zlib.c b/crypto/zlib.c
new file mode 100644
index 0000000..33609ba
--- /dev/null
+++ b/crypto/zlib.c
@@ -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");