1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Cryptographic API. 4 */ 5 6 #include <linux/init.h> 7 #include <linux/module.h> 8 #include <linux/crypto.h> 9 #include <linux/vmalloc.h> 10 #include <linux/mm.h> 11 #include <linux/lzo.h> 12 #include <crypto/internal/scompress.h> 13 14 struct lzo_ctx { 15 void *lzo_comp_mem; 16 }; 17 18 static void *lzo_alloc_ctx(struct crypto_scomp *tfm) 19 { 20 void *ctx; 21 22 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL); 23 if (!ctx) 24 return ERR_PTR(-ENOMEM); 25 26 return ctx; 27 } 28 29 static int lzo_init(struct crypto_tfm *tfm) 30 { 31 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); 32 33 ctx->lzo_comp_mem = lzo_alloc_ctx(NULL); 34 if (IS_ERR(ctx->lzo_comp_mem)) 35 return -ENOMEM; 36 37 return 0; 38 } 39 40 static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx) 41 { 42 kvfree(ctx); 43 } 44 45 static void lzo_exit(struct crypto_tfm *tfm) 46 { 47 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); 48 49 lzo_free_ctx(NULL, ctx->lzo_comp_mem); 50 } 51 52 static int __lzo_compress(const u8 *src, unsigned int slen, 53 u8 *dst, unsigned int *dlen, void *ctx) 54 { 55 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ 56 int err; 57 58 err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx); 59 60 if (err != LZO_E_OK) 61 return -EINVAL; 62 63 *dlen = tmp_len; 64 return 0; 65 } 66 67 static int lzo_compress(struct crypto_tfm *tfm, const u8 *src, 68 unsigned int slen, u8 *dst, unsigned int *dlen) 69 { 70 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); 71 72 return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem); 73 } 74 75 static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src, 76 unsigned int slen, u8 *dst, unsigned int *dlen, 77 void *ctx) 78 { 79 return __lzo_compress(src, slen, dst, dlen, ctx); 80 } 81 82 static int __lzo_decompress(const u8 *src, unsigned int slen, 83 u8 *dst, unsigned int *dlen) 84 { 85 int err; 86 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ 87 88 err = lzo1x_decompress_safe(src, slen, dst, &tmp_len); 89 90 if (err != LZO_E_OK) 91 return -EINVAL; 92 93 *dlen = tmp_len; 94 return 0; 95 } 96 97 static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src, 98 unsigned int slen, u8 *dst, unsigned int *dlen) 99 { 100 return __lzo_decompress(src, slen, dst, dlen); 101 } 102 103 static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src, 104 unsigned int slen, u8 *dst, unsigned int *dlen, 105 void *ctx) 106 { 107 return __lzo_decompress(src, slen, dst, dlen); 108 } 109 110 static struct crypto_alg alg = { 111 .cra_name = "lzo", 112 .cra_driver_name = "lzo-generic", 113 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, 114 .cra_ctxsize = sizeof(struct lzo_ctx), 115 .cra_module = THIS_MODULE, 116 .cra_init = lzo_init, 117 .cra_exit = lzo_exit, 118 .cra_u = { .compress = { 119 .coa_compress = lzo_compress, 120 .coa_decompress = lzo_decompress } } 121 }; 122 123 static struct scomp_alg scomp = { 124 .alloc_ctx = lzo_alloc_ctx, 125 .free_ctx = lzo_free_ctx, 126 .compress = lzo_scompress, 127 .decompress = lzo_sdecompress, 128 .base = { 129 .cra_name = "lzo", 130 .cra_driver_name = "lzo-scomp", 131 .cra_module = THIS_MODULE, 132 } 133 }; 134 135 static int __init lzo_mod_init(void) 136 { 137 int ret; 138 139 ret = crypto_register_alg(&alg); 140 if (ret) 141 return ret; 142 143 ret = crypto_register_scomp(&scomp); 144 if (ret) { 145 crypto_unregister_alg(&alg); 146 return ret; 147 } 148 149 return ret; 150 } 151 152 static void __exit lzo_mod_fini(void) 153 { 154 crypto_unregister_alg(&alg); 155 crypto_unregister_scomp(&scomp); 156 } 157 158 subsys_initcall(lzo_mod_init); 159 module_exit(lzo_mod_fini); 160 161 MODULE_LICENSE("GPL"); 162 MODULE_DESCRIPTION("LZO Compression Algorithm"); 163 MODULE_ALIAS_CRYPTO("lzo"); 164