11ccea77eSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2333b0d7eSKazunori MIYAZAWA /* 3333b0d7eSKazunori MIYAZAWA * Copyright (C)2006 USAGI/WIDE Project 4333b0d7eSKazunori MIYAZAWA * 5333b0d7eSKazunori MIYAZAWA * Author: 6333b0d7eSKazunori MIYAZAWA * Kazunori Miyazawa <miyazawa@linux-ipv6.org> 7333b0d7eSKazunori MIYAZAWA */ 8333b0d7eSKazunori MIYAZAWA 93106caabSHerbert Xu #include <crypto/internal/hash.h> 10333b0d7eSKazunori MIYAZAWA #include <linux/err.h> 11333b0d7eSKazunori MIYAZAWA #include <linux/kernel.h> 124bb33cc8SPaul Gortmaker #include <linux/module.h> 13333b0d7eSKazunori MIYAZAWA 145b37538aSAdrian Bunk static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101, 15333b0d7eSKazunori MIYAZAWA 0x02020202, 0x02020202, 0x02020202, 0x02020202, 16333b0d7eSKazunori MIYAZAWA 0x03030303, 0x03030303, 0x03030303, 0x03030303}; 17ac95301fSHerbert Xu 18333b0d7eSKazunori MIYAZAWA /* 19333b0d7eSKazunori MIYAZAWA * +------------------------ 20333b0d7eSKazunori MIYAZAWA * | <parent tfm> 21333b0d7eSKazunori MIYAZAWA * +------------------------ 22ac95301fSHerbert Xu * | xcbc_tfm_ctx 23ac95301fSHerbert Xu * +------------------------ 24ac95301fSHerbert Xu * | consts (block size * 2) 25ac95301fSHerbert Xu * +------------------------ 26ac95301fSHerbert Xu */ 27ac95301fSHerbert Xu struct xcbc_tfm_ctx { 28ac95301fSHerbert Xu struct crypto_cipher *child; 29ac95301fSHerbert Xu u8 ctx[]; 30ac95301fSHerbert Xu }; 31ac95301fSHerbert Xu 32ac95301fSHerbert Xu /* 33ac95301fSHerbert Xu * +------------------------ 34ac95301fSHerbert Xu * | <shash desc> 35ac95301fSHerbert Xu * +------------------------ 36ac95301fSHerbert Xu * | xcbc_desc_ctx 37333b0d7eSKazunori MIYAZAWA * +------------------------ 38333b0d7eSKazunori MIYAZAWA * | odds (block size) 39333b0d7eSKazunori MIYAZAWA * +------------------------ 40333b0d7eSKazunori MIYAZAWA * | prev (block size) 41333b0d7eSKazunori MIYAZAWA * +------------------------ 42333b0d7eSKazunori MIYAZAWA */ 43ac95301fSHerbert Xu struct xcbc_desc_ctx { 44333b0d7eSKazunori MIYAZAWA unsigned int len; 45ac95301fSHerbert Xu u8 ctx[]; 46333b0d7eSKazunori MIYAZAWA }; 47333b0d7eSKazunori MIYAZAWA 483bdd23f8SKees Cook #define XCBC_BLOCKSIZE 16 493bdd23f8SKees Cook 503106caabSHerbert Xu static int crypto_xcbc_digest_setkey(struct crypto_shash *parent, 51333b0d7eSKazunori MIYAZAWA const u8 *inkey, unsigned int keylen) 52333b0d7eSKazunori MIYAZAWA { 53ac95301fSHerbert Xu unsigned long alignmask = crypto_shash_alignmask(parent); 54ac95301fSHerbert Xu struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent); 55ac95301fSHerbert Xu u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); 56ac95301fSHerbert Xu int err = 0; 573bdd23f8SKees Cook u8 key1[XCBC_BLOCKSIZE]; 583bdd23f8SKees Cook int bs = sizeof(key1); 59333b0d7eSKazunori MIYAZAWA 60ac95301fSHerbert Xu if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen))) 61ac95301fSHerbert Xu return err; 62333b0d7eSKazunori MIYAZAWA 63ac95301fSHerbert Xu crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs); 64ac95301fSHerbert Xu crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2); 65ac95301fSHerbert Xu crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks); 66333b0d7eSKazunori MIYAZAWA 67ac95301fSHerbert Xu return crypto_cipher_setkey(ctx->child, key1, bs); 68ac95301fSHerbert Xu 69333b0d7eSKazunori MIYAZAWA } 70333b0d7eSKazunori MIYAZAWA 713106caabSHerbert Xu static int crypto_xcbc_digest_init(struct shash_desc *pdesc) 72333b0d7eSKazunori MIYAZAWA { 73ac95301fSHerbert Xu unsigned long alignmask = crypto_shash_alignmask(pdesc->tfm); 74ac95301fSHerbert Xu struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); 753106caabSHerbert Xu int bs = crypto_shash_blocksize(pdesc->tfm); 76ac95301fSHerbert Xu u8 *prev = PTR_ALIGN(&ctx->ctx[0], alignmask + 1) + bs; 77333b0d7eSKazunori MIYAZAWA 78333b0d7eSKazunori MIYAZAWA ctx->len = 0; 79ac95301fSHerbert Xu memset(prev, 0, bs); 80333b0d7eSKazunori MIYAZAWA 81333b0d7eSKazunori MIYAZAWA return 0; 82333b0d7eSKazunori MIYAZAWA } 83333b0d7eSKazunori MIYAZAWA 843106caabSHerbert Xu static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p, 853106caabSHerbert Xu unsigned int len) 86333b0d7eSKazunori MIYAZAWA { 873106caabSHerbert Xu struct crypto_shash *parent = pdesc->tfm; 88ac95301fSHerbert Xu unsigned long alignmask = crypto_shash_alignmask(parent); 89ac95301fSHerbert Xu struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent); 90ac95301fSHerbert Xu struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); 91ac95301fSHerbert Xu struct crypto_cipher *tfm = tctx->child; 923106caabSHerbert Xu int bs = crypto_shash_blocksize(parent); 93ac95301fSHerbert Xu u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); 94ac95301fSHerbert Xu u8 *prev = odds + bs; 95333b0d7eSKazunori MIYAZAWA 96333b0d7eSKazunori MIYAZAWA /* checking the data can fill the block */ 97333b0d7eSKazunori MIYAZAWA if ((ctx->len + len) <= bs) { 98ac95301fSHerbert Xu memcpy(odds + ctx->len, p, len); 99333b0d7eSKazunori MIYAZAWA ctx->len += len; 1003106caabSHerbert Xu return 0; 101333b0d7eSKazunori MIYAZAWA } 102333b0d7eSKazunori MIYAZAWA 103333b0d7eSKazunori MIYAZAWA /* filling odds with new data and encrypting it */ 104ac95301fSHerbert Xu memcpy(odds + ctx->len, p, bs - ctx->len); 105333b0d7eSKazunori MIYAZAWA len -= bs - ctx->len; 106333b0d7eSKazunori MIYAZAWA p += bs - ctx->len; 107333b0d7eSKazunori MIYAZAWA 108ac95301fSHerbert Xu crypto_xor(prev, odds, bs); 109ac95301fSHerbert Xu crypto_cipher_encrypt_one(tfm, prev, prev); 110333b0d7eSKazunori MIYAZAWA 111333b0d7eSKazunori MIYAZAWA /* clearing the length */ 112333b0d7eSKazunori MIYAZAWA ctx->len = 0; 113333b0d7eSKazunori MIYAZAWA 114333b0d7eSKazunori MIYAZAWA /* encrypting the rest of data */ 115333b0d7eSKazunori MIYAZAWA while (len > bs) { 116ac95301fSHerbert Xu crypto_xor(prev, p, bs); 117ac95301fSHerbert Xu crypto_cipher_encrypt_one(tfm, prev, prev); 118333b0d7eSKazunori MIYAZAWA p += bs; 119333b0d7eSKazunori MIYAZAWA len -= bs; 120333b0d7eSKazunori MIYAZAWA } 121333b0d7eSKazunori MIYAZAWA 122333b0d7eSKazunori MIYAZAWA /* keeping the surplus of blocksize */ 123333b0d7eSKazunori MIYAZAWA if (len) { 124ac95301fSHerbert Xu memcpy(odds, p, len); 125333b0d7eSKazunori MIYAZAWA ctx->len = len; 126333b0d7eSKazunori MIYAZAWA } 127333b0d7eSKazunori MIYAZAWA 128333b0d7eSKazunori MIYAZAWA return 0; 129333b0d7eSKazunori MIYAZAWA } 130333b0d7eSKazunori MIYAZAWA 1313106caabSHerbert Xu static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out) 132fb469840SHerbert Xu { 1333106caabSHerbert Xu struct crypto_shash *parent = pdesc->tfm; 134ac95301fSHerbert Xu unsigned long alignmask = crypto_shash_alignmask(parent); 135ac95301fSHerbert Xu struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent); 136ac95301fSHerbert Xu struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); 137ac95301fSHerbert Xu struct crypto_cipher *tfm = tctx->child; 1383106caabSHerbert Xu int bs = crypto_shash_blocksize(parent); 139ac95301fSHerbert Xu u8 *consts = PTR_ALIGN(&tctx->ctx[0], alignmask + 1); 140ac95301fSHerbert Xu u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); 141ac95301fSHerbert Xu u8 *prev = odds + bs; 142ac95301fSHerbert Xu unsigned int offset = 0; 143333b0d7eSKazunori MIYAZAWA 144ac95301fSHerbert Xu if (ctx->len != bs) { 145333b0d7eSKazunori MIYAZAWA unsigned int rlen; 146ac95301fSHerbert Xu u8 *p = odds + ctx->len; 147ac95301fSHerbert Xu 148333b0d7eSKazunori MIYAZAWA *p = 0x80; 149333b0d7eSKazunori MIYAZAWA p++; 150333b0d7eSKazunori MIYAZAWA 151333b0d7eSKazunori MIYAZAWA rlen = bs - ctx->len -1; 152333b0d7eSKazunori MIYAZAWA if (rlen) 153333b0d7eSKazunori MIYAZAWA memset(p, 0, rlen); 154333b0d7eSKazunori MIYAZAWA 155ac95301fSHerbert Xu offset += bs; 156333b0d7eSKazunori MIYAZAWA } 157333b0d7eSKazunori MIYAZAWA 158ac95301fSHerbert Xu crypto_xor(prev, odds, bs); 159ac95301fSHerbert Xu crypto_xor(prev, consts + offset, bs); 160ac95301fSHerbert Xu 161ac95301fSHerbert Xu crypto_cipher_encrypt_one(tfm, out, prev); 162ac95301fSHerbert Xu 163333b0d7eSKazunori MIYAZAWA return 0; 164333b0d7eSKazunori MIYAZAWA } 165333b0d7eSKazunori MIYAZAWA 166333b0d7eSKazunori MIYAZAWA static int xcbc_init_tfm(struct crypto_tfm *tfm) 167333b0d7eSKazunori MIYAZAWA { 1682e306ee0SHerbert Xu struct crypto_cipher *cipher; 169333b0d7eSKazunori MIYAZAWA struct crypto_instance *inst = (void *)tfm->__crt_alg; 170d5ed3b65SEric Biggers struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst); 171ac95301fSHerbert Xu struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 172333b0d7eSKazunori MIYAZAWA 1732e306ee0SHerbert Xu cipher = crypto_spawn_cipher(spawn); 1742e306ee0SHerbert Xu if (IS_ERR(cipher)) 1752e306ee0SHerbert Xu return PTR_ERR(cipher); 176333b0d7eSKazunori MIYAZAWA 1772e306ee0SHerbert Xu ctx->child = cipher; 178333b0d7eSKazunori MIYAZAWA 179333b0d7eSKazunori MIYAZAWA return 0; 180333b0d7eSKazunori MIYAZAWA }; 181333b0d7eSKazunori MIYAZAWA 182333b0d7eSKazunori MIYAZAWA static void xcbc_exit_tfm(struct crypto_tfm *tfm) 183333b0d7eSKazunori MIYAZAWA { 184ac95301fSHerbert Xu struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 185333b0d7eSKazunori MIYAZAWA crypto_free_cipher(ctx->child); 186333b0d7eSKazunori MIYAZAWA } 187333b0d7eSKazunori MIYAZAWA 1883106caabSHerbert Xu static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb) 189333b0d7eSKazunori MIYAZAWA { 1903106caabSHerbert Xu struct shash_instance *inst; 1911e212a6aSEric Biggers struct crypto_cipher_spawn *spawn; 192333b0d7eSKazunori MIYAZAWA struct crypto_alg *alg; 19336f87a4aSSteffen Klassert unsigned long alignmask; 1947bcb2c99SEric Biggers u32 mask; 195ebc610e5SHerbert Xu int err; 196ebc610e5SHerbert Xu 1977bcb2c99SEric Biggers err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask); 198ebc610e5SHerbert Xu if (err) 1993106caabSHerbert Xu return err; 200ebc610e5SHerbert Xu 2011e212a6aSEric Biggers inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 2021e212a6aSEric Biggers if (!inst) 2031e212a6aSEric Biggers return -ENOMEM; 2041e212a6aSEric Biggers spawn = shash_instance_ctx(inst); 205333b0d7eSKazunori MIYAZAWA 2061e212a6aSEric Biggers err = crypto_grab_cipher(spawn, shash_crypto_instance(inst), 2077bcb2c99SEric Biggers crypto_attr_alg_name(tb[1]), 0, mask); 2083106caabSHerbert Xu if (err) 2091e212a6aSEric Biggers goto err_free_inst; 2101e212a6aSEric Biggers alg = crypto_spawn_cipher_alg(spawn); 2111e212a6aSEric Biggers 2121e212a6aSEric Biggers err = -EINVAL; 2131e212a6aSEric Biggers if (alg->cra_blocksize != XCBC_BLOCKSIZE) 2141e212a6aSEric Biggers goto err_free_inst; 2151e212a6aSEric Biggers 2161e212a6aSEric Biggers err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg); 2171e212a6aSEric Biggers if (err) 2181e212a6aSEric Biggers goto err_free_inst; 219333b0d7eSKazunori MIYAZAWA 22036f87a4aSSteffen Klassert alignmask = alg->cra_alignmask | 3; 22136f87a4aSSteffen Klassert inst->alg.base.cra_alignmask = alignmask; 2223106caabSHerbert Xu inst->alg.base.cra_priority = alg->cra_priority; 2233106caabSHerbert Xu inst->alg.base.cra_blocksize = alg->cra_blocksize; 224333b0d7eSKazunori MIYAZAWA 2253106caabSHerbert Xu inst->alg.digestsize = alg->cra_blocksize; 226ac95301fSHerbert Xu inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx), 227ac95301fSHerbert Xu crypto_tfm_ctx_alignment()) + 22836f87a4aSSteffen Klassert (alignmask & 229ac95301fSHerbert Xu ~(crypto_tfm_ctx_alignment() - 1)) + 230ac95301fSHerbert Xu alg->cra_blocksize * 2; 231ac95301fSHerbert Xu 232ac95301fSHerbert Xu inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx), 23336f87a4aSSteffen Klassert alignmask + 1) + 234ac95301fSHerbert Xu alg->cra_blocksize * 2; 2353106caabSHerbert Xu inst->alg.base.cra_init = xcbc_init_tfm; 2363106caabSHerbert Xu inst->alg.base.cra_exit = xcbc_exit_tfm; 2373106caabSHerbert Xu 2383106caabSHerbert Xu inst->alg.init = crypto_xcbc_digest_init; 2393106caabSHerbert Xu inst->alg.update = crypto_xcbc_digest_update; 2403106caabSHerbert Xu inst->alg.final = crypto_xcbc_digest_final; 2413106caabSHerbert Xu inst->alg.setkey = crypto_xcbc_digest_setkey; 2423106caabSHerbert Xu 243a39c66ccSEric Biggers inst->free = shash_free_singlespawn_instance; 244a39c66ccSEric Biggers 2453106caabSHerbert Xu err = shash_register_instance(tmpl, inst); 2463106caabSHerbert Xu if (err) { 2471e212a6aSEric Biggers err_free_inst: 248a39c66ccSEric Biggers shash_free_singlespawn_instance(inst); 2493106caabSHerbert Xu } 2503106caabSHerbert Xu return err; 251333b0d7eSKazunori MIYAZAWA } 252333b0d7eSKazunori MIYAZAWA 253333b0d7eSKazunori MIYAZAWA static struct crypto_template crypto_xcbc_tmpl = { 254333b0d7eSKazunori MIYAZAWA .name = "xcbc", 2553106caabSHerbert Xu .create = xcbc_create, 256333b0d7eSKazunori MIYAZAWA .module = THIS_MODULE, 257333b0d7eSKazunori MIYAZAWA }; 258333b0d7eSKazunori MIYAZAWA 259333b0d7eSKazunori MIYAZAWA static int __init crypto_xcbc_module_init(void) 260333b0d7eSKazunori MIYAZAWA { 261333b0d7eSKazunori MIYAZAWA return crypto_register_template(&crypto_xcbc_tmpl); 262333b0d7eSKazunori MIYAZAWA } 263333b0d7eSKazunori MIYAZAWA 264333b0d7eSKazunori MIYAZAWA static void __exit crypto_xcbc_module_exit(void) 265333b0d7eSKazunori MIYAZAWA { 266333b0d7eSKazunori MIYAZAWA crypto_unregister_template(&crypto_xcbc_tmpl); 267333b0d7eSKazunori MIYAZAWA } 268333b0d7eSKazunori MIYAZAWA 269c4741b23SEric Biggers subsys_initcall(crypto_xcbc_module_init); 270333b0d7eSKazunori MIYAZAWA module_exit(crypto_xcbc_module_exit); 271333b0d7eSKazunori MIYAZAWA 272333b0d7eSKazunori MIYAZAWA MODULE_LICENSE("GPL"); 273333b0d7eSKazunori MIYAZAWA MODULE_DESCRIPTION("XCBC keyed hash algorithm"); 2744943ba16SKees Cook MODULE_ALIAS_CRYPTO("xcbc"); 275