/*
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* Cryptographic API.
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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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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/lzo.h>
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struct lzo_ctx {
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void *lzo_comp_mem;
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};
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static int lzo_init(struct crypto_tfm *tfm)
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{
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struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
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ctx->lzo_comp_mem = kmalloc(LZO1X_MEM_COMPRESS,
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GFP_KERNEL | __GFP_NOWARN);
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if (!ctx->lzo_comp_mem)
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ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
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if (!ctx->lzo_comp_mem)
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return -ENOMEM;
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return 0;
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}
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static void lzo_exit(struct crypto_tfm *tfm)
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{
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struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
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kvfree(ctx->lzo_comp_mem);
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}
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static int lzo_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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struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
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size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
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int err;
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err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);
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if (err != LZO_E_OK)
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return -EINVAL;
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*dlen = tmp_len;
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return 0;
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}
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static int lzo_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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int err;
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size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
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err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
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if (err != LZO_E_OK)
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return -EINVAL;
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*dlen = tmp_len;
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return 0;
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}
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static struct crypto_alg alg = {
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.cra_name = "lzo",
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
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.cra_ctxsize = sizeof(struct lzo_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = lzo_init,
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.cra_exit = lzo_exit,
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.cra_u = { .compress = {
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.coa_compress = lzo_compress,
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.coa_decompress = lzo_decompress } }
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};
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static int __init lzo_mod_init(void)
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{
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return crypto_register_alg(&alg);
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}
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static void __exit lzo_mod_fini(void)
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{
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crypto_unregister_alg(&alg);
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}
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module_init(lzo_mod_init);
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module_exit(lzo_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("LZO Compression Algorithm");
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MODULE_ALIAS_CRYPTO("lzo");
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