/* * Cryptographic API. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #include <linux/init.h> #include <linux/module.h> #include <linux/crypto.h> #include <linux/vmalloc.h> #include <linux/mm.h> #include <linux/lzo.h> #include <crypto/internal/scompress.h> struct lzo_ctx { void *lzo_comp_mem; }; static void *lzo_alloc_ctx(struct crypto_scomp *tfm) { void *ctx; ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL); if (!ctx) return ERR_PTR(-ENOMEM); return ctx; } static int lzo_init(struct crypto_tfm *tfm) { struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); ctx->lzo_comp_mem = lzo_alloc_ctx(NULL); if (IS_ERR(ctx->lzo_comp_mem)) return -ENOMEM; return 0; } static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx) { kvfree(ctx); } static void lzo_exit(struct crypto_tfm *tfm) { struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); lzo_free_ctx(NULL, ctx->lzo_comp_mem); } static int __lzo_compress(const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx) { size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ int err; err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx); if (err != LZO_E_OK) return -EINVAL; *dlen = tmp_len; return 0; } static int lzo_compress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) { struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem); } static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx) { return __lzo_compress(src, slen, dst, dlen, ctx); } static int __lzo_decompress(const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) { int err; size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ err = lzo1x_decompress_safe(src, slen, dst, &tmp_len); if (err != LZO_E_OK) return -EINVAL; *dlen = tmp_len; return 0; } static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) { return __lzo_decompress(src, slen, dst, dlen); } static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx) { return __lzo_decompress(src, slen, dst, dlen); } static struct crypto_alg alg = { .cra_name = "lzo", .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, .cra_ctxsize = sizeof(struct lzo_ctx), .cra_module = THIS_MODULE, .cra_init = lzo_init, .cra_exit = lzo_exit, .cra_u = { .compress = { .coa_compress = lzo_compress, .coa_decompress = lzo_decompress } } }; static struct scomp_alg scomp = { .alloc_ctx = lzo_alloc_ctx, .free_ctx = lzo_free_ctx, .compress = lzo_scompress, .decompress = lzo_sdecompress, .base = { .cra_name = "lzo", .cra_driver_name = "lzo-scomp", .cra_module = THIS_MODULE, } }; static int __init lzo_mod_init(void) { int ret; ret = crypto_register_alg(&alg); if (ret) return ret; ret = crypto_register_scomp(&scomp); if (ret) { crypto_unregister_alg(&alg); return ret; } return ret; } static void __exit lzo_mod_fini(void) { crypto_unregister_alg(&alg); crypto_unregister_scomp(&scomp); } module_init(lzo_mod_init); module_exit(lzo_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("LZO Compression Algorithm"); MODULE_ALIAS_CRYPTO("lzo");