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>

1 files changed, 378 insertions, 0 deletions

diff --git a/crypto/zlib.c b/crypto/zlib.c
new file mode 100644
index 000000000000..33609bab614e
--- /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");