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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Cryptographic API.
- */
- #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 lzorle_ctx {
- void *lzorle_comp_mem;
- };
- static void *lzorle_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 lzorle_init(struct crypto_tfm *tfm)
- {
- struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
- ctx->lzorle_comp_mem = lzorle_alloc_ctx(NULL);
- if (IS_ERR(ctx->lzorle_comp_mem))
- return -ENOMEM;
- return 0;
- }
- static void lzorle_free_ctx(struct crypto_scomp *tfm, void *ctx)
- {
- kvfree(ctx);
- }
- static void lzorle_exit(struct crypto_tfm *tfm)
- {
- struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
- lzorle_free_ctx(NULL, ctx->lzorle_comp_mem);
- }
- static int __lzorle_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 = lzorle1x_1_compress(src, slen, dst, &tmp_len, ctx);
- if (err != LZO_E_OK)
- return -EINVAL;
- *dlen = tmp_len;
- return 0;
- }
- static int lzorle_compress(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
- {
- struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
- return __lzorle_compress(src, slen, dst, dlen, ctx->lzorle_comp_mem);
- }
- static int lzorle_scompress(struct crypto_scomp *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen,
- void *ctx)
- {
- return __lzorle_compress(src, slen, dst, dlen, ctx);
- }
- static int __lzorle_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 lzorle_decompress(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
- {
- return __lzorle_decompress(src, slen, dst, dlen);
- }
- static int lzorle_sdecompress(struct crypto_scomp *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen,
- void *ctx)
- {
- return __lzorle_decompress(src, slen, dst, dlen);
- }
- static struct crypto_alg alg = {
- .cra_name = "lzo-rle",
- .cra_driver_name = "lzo-rle-generic",
- .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
- .cra_ctxsize = sizeof(struct lzorle_ctx),
- .cra_module = THIS_MODULE,
- .cra_init = lzorle_init,
- .cra_exit = lzorle_exit,
- .cra_u = { .compress = {
- .coa_compress = lzorle_compress,
- .coa_decompress = lzorle_decompress } }
- };
- static struct scomp_alg scomp = {
- .alloc_ctx = lzorle_alloc_ctx,
- .free_ctx = lzorle_free_ctx,
- .compress = lzorle_scompress,
- .decompress = lzorle_sdecompress,
- .base = {
- .cra_name = "lzo-rle",
- .cra_driver_name = "lzo-rle-scomp",
- .cra_module = THIS_MODULE,
- }
- };
- static int __init lzorle_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 lzorle_mod_fini(void)
- {
- crypto_unregister_alg(&alg);
- crypto_unregister_scomp(&scomp);
- }
- subsys_initcall(lzorle_mod_init);
- module_exit(lzorle_mod_fini);
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
- MODULE_ALIAS_CRYPTO("lzo-rle");
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