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110 lines
2.6 KiB
110 lines
2.6 KiB
/* |
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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 | __GFP_REPEAT); |
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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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