12b27bdccSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
20ea8530dSChanho Min /*
30ea8530dSChanho Min * Cryptographic API.
40ea8530dSChanho Min *
50ea8530dSChanho Min * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
60ea8530dSChanho Min */
70ea8530dSChanho Min
80ea8530dSChanho Min #include <linux/init.h>
90ea8530dSChanho Min #include <linux/module.h>
100ea8530dSChanho Min #include <linux/crypto.h>
110ea8530dSChanho Min #include <linux/vmalloc.h>
120ea8530dSChanho Min #include <linux/lz4.h>
138cd9330eSGiovanni Cabiddu #include <crypto/internal/scompress.h>
140ea8530dSChanho Min
150ea8530dSChanho Min struct lz4_ctx {
160ea8530dSChanho Min void *lz4_comp_mem;
170ea8530dSChanho Min };
180ea8530dSChanho Min
lz4_alloc_ctx(struct crypto_scomp * tfm)198cd9330eSGiovanni Cabiddu static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
208cd9330eSGiovanni Cabiddu {
218cd9330eSGiovanni Cabiddu void *ctx;
228cd9330eSGiovanni Cabiddu
238cd9330eSGiovanni Cabiddu ctx = vmalloc(LZ4_MEM_COMPRESS);
248cd9330eSGiovanni Cabiddu if (!ctx)
258cd9330eSGiovanni Cabiddu return ERR_PTR(-ENOMEM);
268cd9330eSGiovanni Cabiddu
278cd9330eSGiovanni Cabiddu return ctx;
288cd9330eSGiovanni Cabiddu }
298cd9330eSGiovanni Cabiddu
lz4_init(struct crypto_tfm * tfm)300ea8530dSChanho Min static int lz4_init(struct crypto_tfm *tfm)
310ea8530dSChanho Min {
320ea8530dSChanho Min struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
330ea8530dSChanho Min
348cd9330eSGiovanni Cabiddu ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
358cd9330eSGiovanni Cabiddu if (IS_ERR(ctx->lz4_comp_mem))
360ea8530dSChanho Min return -ENOMEM;
370ea8530dSChanho Min
380ea8530dSChanho Min return 0;
390ea8530dSChanho Min }
400ea8530dSChanho Min
lz4_free_ctx(struct crypto_scomp * tfm,void * ctx)418cd9330eSGiovanni Cabiddu static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
428cd9330eSGiovanni Cabiddu {
438cd9330eSGiovanni Cabiddu vfree(ctx);
448cd9330eSGiovanni Cabiddu }
458cd9330eSGiovanni Cabiddu
lz4_exit(struct crypto_tfm * tfm)460ea8530dSChanho Min static void lz4_exit(struct crypto_tfm *tfm)
470ea8530dSChanho Min {
480ea8530dSChanho Min struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
498cd9330eSGiovanni Cabiddu
508cd9330eSGiovanni Cabiddu lz4_free_ctx(NULL, ctx->lz4_comp_mem);
510ea8530dSChanho Min }
520ea8530dSChanho Min
__lz4_compress_crypto(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)538cd9330eSGiovanni Cabiddu static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
548cd9330eSGiovanni Cabiddu u8 *dst, unsigned int *dlen, void *ctx)
550ea8530dSChanho Min {
5673a15ac6SSven Schmidt int out_len = LZ4_compress_default(src, dst,
5773a15ac6SSven Schmidt slen, *dlen, ctx);
580ea8530dSChanho Min
5973a15ac6SSven Schmidt if (!out_len)
600ea8530dSChanho Min return -EINVAL;
610ea8530dSChanho Min
6273a15ac6SSven Schmidt *dlen = out_len;
630ea8530dSChanho Min return 0;
640ea8530dSChanho Min }
650ea8530dSChanho Min
lz4_scompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)668cd9330eSGiovanni Cabiddu static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
678cd9330eSGiovanni Cabiddu unsigned int slen, u8 *dst, unsigned int *dlen,
688cd9330eSGiovanni Cabiddu void *ctx)
698cd9330eSGiovanni Cabiddu {
708cd9330eSGiovanni Cabiddu return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
718cd9330eSGiovanni Cabiddu }
728cd9330eSGiovanni Cabiddu
lz4_compress_crypto(struct crypto_tfm * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)738cd9330eSGiovanni Cabiddu static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
740ea8530dSChanho Min unsigned int slen, u8 *dst, unsigned int *dlen)
750ea8530dSChanho Min {
768cd9330eSGiovanni Cabiddu struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
778cd9330eSGiovanni Cabiddu
788cd9330eSGiovanni Cabiddu return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
798cd9330eSGiovanni Cabiddu }
808cd9330eSGiovanni Cabiddu
__lz4_decompress_crypto(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)818cd9330eSGiovanni Cabiddu static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
828cd9330eSGiovanni Cabiddu u8 *dst, unsigned int *dlen, void *ctx)
838cd9330eSGiovanni Cabiddu {
8473a15ac6SSven Schmidt int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
850ea8530dSChanho Min
8673a15ac6SSven Schmidt if (out_len < 0)
87cd15f102SMyungho Jung return -EINVAL;
880ea8530dSChanho Min
8973a15ac6SSven Schmidt *dlen = out_len;
9073a15ac6SSven Schmidt return 0;
910ea8530dSChanho Min }
920ea8530dSChanho Min
lz4_sdecompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)938cd9330eSGiovanni Cabiddu static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
948cd9330eSGiovanni Cabiddu unsigned int slen, u8 *dst, unsigned int *dlen,
958cd9330eSGiovanni Cabiddu void *ctx)
968cd9330eSGiovanni Cabiddu {
978cd9330eSGiovanni Cabiddu return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
988cd9330eSGiovanni Cabiddu }
998cd9330eSGiovanni Cabiddu
lz4_decompress_crypto(struct crypto_tfm * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)1008cd9330eSGiovanni Cabiddu static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
1018cd9330eSGiovanni Cabiddu unsigned int slen, u8 *dst,
1028cd9330eSGiovanni Cabiddu unsigned int *dlen)
1038cd9330eSGiovanni Cabiddu {
1048cd9330eSGiovanni Cabiddu return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
1058cd9330eSGiovanni Cabiddu }
1068cd9330eSGiovanni Cabiddu
1070ea8530dSChanho Min static struct crypto_alg alg_lz4 = {
1080ea8530dSChanho Min .cra_name = "lz4",
109*d6ebf528SEric Biggers .cra_driver_name = "lz4-generic",
1100ea8530dSChanho Min .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
1110ea8530dSChanho Min .cra_ctxsize = sizeof(struct lz4_ctx),
1120ea8530dSChanho Min .cra_module = THIS_MODULE,
1130ea8530dSChanho Min .cra_init = lz4_init,
1140ea8530dSChanho Min .cra_exit = lz4_exit,
1150ea8530dSChanho Min .cra_u = { .compress = {
1160ea8530dSChanho Min .coa_compress = lz4_compress_crypto,
1170ea8530dSChanho Min .coa_decompress = lz4_decompress_crypto } }
1180ea8530dSChanho Min };
1190ea8530dSChanho Min
1208cd9330eSGiovanni Cabiddu static struct scomp_alg scomp = {
1218cd9330eSGiovanni Cabiddu .alloc_ctx = lz4_alloc_ctx,
1228cd9330eSGiovanni Cabiddu .free_ctx = lz4_free_ctx,
1238cd9330eSGiovanni Cabiddu .compress = lz4_scompress,
1248cd9330eSGiovanni Cabiddu .decompress = lz4_sdecompress,
1258cd9330eSGiovanni Cabiddu .base = {
1268cd9330eSGiovanni Cabiddu .cra_name = "lz4",
1278cd9330eSGiovanni Cabiddu .cra_driver_name = "lz4-scomp",
1288cd9330eSGiovanni Cabiddu .cra_module = THIS_MODULE,
1298cd9330eSGiovanni Cabiddu }
1308cd9330eSGiovanni Cabiddu };
1318cd9330eSGiovanni Cabiddu
lz4_mod_init(void)1320ea8530dSChanho Min static int __init lz4_mod_init(void)
1330ea8530dSChanho Min {
1348cd9330eSGiovanni Cabiddu int ret;
1358cd9330eSGiovanni Cabiddu
1368cd9330eSGiovanni Cabiddu ret = crypto_register_alg(&alg_lz4);
1378cd9330eSGiovanni Cabiddu if (ret)
1388cd9330eSGiovanni Cabiddu return ret;
1398cd9330eSGiovanni Cabiddu
1408cd9330eSGiovanni Cabiddu ret = crypto_register_scomp(&scomp);
1418cd9330eSGiovanni Cabiddu if (ret) {
1428cd9330eSGiovanni Cabiddu crypto_unregister_alg(&alg_lz4);
1438cd9330eSGiovanni Cabiddu return ret;
1448cd9330eSGiovanni Cabiddu }
1458cd9330eSGiovanni Cabiddu
1468cd9330eSGiovanni Cabiddu return ret;
1470ea8530dSChanho Min }
1480ea8530dSChanho Min
lz4_mod_fini(void)1490ea8530dSChanho Min static void __exit lz4_mod_fini(void)
1500ea8530dSChanho Min {
1510ea8530dSChanho Min crypto_unregister_alg(&alg_lz4);
1528cd9330eSGiovanni Cabiddu crypto_unregister_scomp(&scomp);
1530ea8530dSChanho Min }
1540ea8530dSChanho Min
155c4741b23SEric Biggers subsys_initcall(lz4_mod_init);
1560ea8530dSChanho Min module_exit(lz4_mod_fini);
1570ea8530dSChanho Min
1580ea8530dSChanho Min MODULE_LICENSE("GPL");
1590ea8530dSChanho Min MODULE_DESCRIPTION("LZ4 Compression Algorithm");
1605d26a105SKees Cook MODULE_ALIAS_CRYPTO("lz4");
161