1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Cryptographic API. 4 * 5 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com> 6 */ 7 #include <crypto/internal/scompress.h> 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/vmalloc.h> 11 #include <linux/lz4.h> 12 13 struct lz4hc_ctx { 14 void *lz4hc_comp_mem; 15 }; 16 17 static void *lz4hc_alloc_ctx(void) 18 { 19 void *ctx; 20 21 ctx = vmalloc(LZ4HC_MEM_COMPRESS); 22 if (!ctx) 23 return ERR_PTR(-ENOMEM); 24 25 return ctx; 26 } 27 28 static void lz4hc_free_ctx(void *ctx) 29 { 30 vfree(ctx); 31 } 32 33 static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen, 34 u8 *dst, unsigned int *dlen, void *ctx) 35 { 36 int out_len = LZ4_compress_HC(src, dst, slen, 37 *dlen, LZ4HC_DEFAULT_CLEVEL, ctx); 38 39 if (!out_len) 40 return -EINVAL; 41 42 *dlen = out_len; 43 return 0; 44 } 45 46 static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src, 47 unsigned int slen, u8 *dst, unsigned int *dlen, 48 void *ctx) 49 { 50 return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx); 51 } 52 53 static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen, 54 u8 *dst, unsigned int *dlen, void *ctx) 55 { 56 int out_len = LZ4_decompress_safe(src, dst, slen, *dlen); 57 58 if (out_len < 0) 59 return -EINVAL; 60 61 *dlen = out_len; 62 return 0; 63 } 64 65 static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src, 66 unsigned int slen, u8 *dst, unsigned int *dlen, 67 void *ctx) 68 { 69 return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL); 70 } 71 72 static struct scomp_alg scomp = { 73 .alloc_ctx = lz4hc_alloc_ctx, 74 .free_ctx = lz4hc_free_ctx, 75 .compress = lz4hc_scompress, 76 .decompress = lz4hc_sdecompress, 77 .base = { 78 .cra_name = "lz4hc", 79 .cra_driver_name = "lz4hc-scomp", 80 .cra_module = THIS_MODULE, 81 } 82 }; 83 84 static int __init lz4hc_mod_init(void) 85 { 86 return crypto_register_scomp(&scomp); 87 } 88 89 static void __exit lz4hc_mod_fini(void) 90 { 91 crypto_unregister_scomp(&scomp); 92 } 93 94 subsys_initcall(lz4hc_mod_init); 95 module_exit(lz4hc_mod_fini); 96 97 MODULE_LICENSE("GPL"); 98 MODULE_DESCRIPTION("LZ4HC Compression Algorithm"); 99 MODULE_ALIAS_CRYPTO("lz4hc"); 100