Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 2 | /* |
| 3 | * CTR: Counter mode |
| 4 | * |
| 5 | * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <crypto/algapi.h> |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 9 | #include <crypto/ctr.h> |
Ard Biesheuvel | 0eb76ba | 2020-12-11 13:27:15 +0100 | [diff] [blame] | 10 | #include <crypto/internal/cipher.h> |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 11 | #include <crypto/internal/skcipher.h> |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 12 | #include <linux/err.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 16 | #include <linux/slab.h> |
| 17 | |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 18 | struct crypto_rfc3686_ctx { |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 19 | struct crypto_skcipher *child; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 20 | u8 nonce[CTR_RFC3686_NONCE_SIZE]; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 21 | }; |
| 22 | |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 23 | struct crypto_rfc3686_req_ctx { |
| 24 | u8 iv[CTR_RFC3686_BLOCK_SIZE]; |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 25 | struct skcipher_request subreq CRYPTO_MINALIGN_ATTR; |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 26 | }; |
| 27 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 28 | static void crypto_ctr_crypt_final(struct skcipher_walk *walk, |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 29 | struct crypto_cipher *tfm) |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 30 | { |
| 31 | unsigned int bsize = crypto_cipher_blocksize(tfm); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 32 | unsigned long alignmask = crypto_cipher_alignmask(tfm); |
| 33 | u8 *ctrblk = walk->iv; |
Salvatore Mesoraca | 6650c4d | 2018-04-09 15:54:47 +0200 | [diff] [blame] | 34 | u8 tmp[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK]; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 35 | u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1); |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 36 | u8 *src = walk->src.virt.addr; |
| 37 | u8 *dst = walk->dst.virt.addr; |
| 38 | unsigned int nbytes = walk->nbytes; |
| 39 | |
| 40 | crypto_cipher_encrypt_one(tfm, keystream, ctrblk); |
Ard Biesheuvel | 45fe93d | 2017-07-24 11:28:04 +0100 | [diff] [blame] | 41 | crypto_xor_cpy(dst, keystream, src, nbytes); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 42 | |
| 43 | crypto_inc(ctrblk, bsize); |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 44 | } |
| 45 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 46 | static int crypto_ctr_crypt_segment(struct skcipher_walk *walk, |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 47 | struct crypto_cipher *tfm) |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 48 | { |
| 49 | void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = |
| 50 | crypto_cipher_alg(tfm)->cia_encrypt; |
| 51 | unsigned int bsize = crypto_cipher_blocksize(tfm); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 52 | u8 *ctrblk = walk->iv; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 53 | u8 *src = walk->src.virt.addr; |
| 54 | u8 *dst = walk->dst.virt.addr; |
| 55 | unsigned int nbytes = walk->nbytes; |
| 56 | |
| 57 | do { |
| 58 | /* create keystream */ |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 59 | fn(crypto_cipher_tfm(tfm), dst, ctrblk); |
| 60 | crypto_xor(dst, src, bsize); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 61 | |
| 62 | /* increment counter in counterblock */ |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 63 | crypto_inc(ctrblk, bsize); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 64 | |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 65 | src += bsize; |
| 66 | dst += bsize; |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 67 | } while ((nbytes -= bsize) >= bsize); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 68 | |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 69 | return nbytes; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 70 | } |
| 71 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 72 | static int crypto_ctr_crypt_inplace(struct skcipher_walk *walk, |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 73 | struct crypto_cipher *tfm) |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 74 | { |
| 75 | void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = |
| 76 | crypto_cipher_alg(tfm)->cia_encrypt; |
| 77 | unsigned int bsize = crypto_cipher_blocksize(tfm); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 78 | unsigned long alignmask = crypto_cipher_alignmask(tfm); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 79 | unsigned int nbytes = walk->nbytes; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 80 | u8 *ctrblk = walk->iv; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 81 | u8 *src = walk->src.virt.addr; |
Salvatore Mesoraca | 6650c4d | 2018-04-09 15:54:47 +0200 | [diff] [blame] | 82 | u8 tmp[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK]; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 83 | u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 84 | |
| 85 | do { |
| 86 | /* create keystream */ |
| 87 | fn(crypto_cipher_tfm(tfm), keystream, ctrblk); |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 88 | crypto_xor(src, keystream, bsize); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 89 | |
| 90 | /* increment counter in counterblock */ |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 91 | crypto_inc(ctrblk, bsize); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 92 | |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 93 | src += bsize; |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 94 | } while ((nbytes -= bsize) >= bsize); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 95 | |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 96 | return nbytes; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 97 | } |
| 98 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 99 | static int crypto_ctr_crypt(struct skcipher_request *req) |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 100 | { |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 101 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| 102 | struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); |
| 103 | const unsigned int bsize = crypto_cipher_blocksize(cipher); |
| 104 | struct skcipher_walk walk; |
| 105 | unsigned int nbytes; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 106 | int err; |
| 107 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 108 | err = skcipher_walk_virt(&walk, req, false); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 109 | |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 110 | while (walk.nbytes >= bsize) { |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 111 | if (walk.src.virt.addr == walk.dst.virt.addr) |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 112 | nbytes = crypto_ctr_crypt_inplace(&walk, cipher); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 113 | else |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 114 | nbytes = crypto_ctr_crypt_segment(&walk, cipher); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 115 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 116 | err = skcipher_walk_done(&walk, nbytes); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 117 | } |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 118 | |
| 119 | if (walk.nbytes) { |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 120 | crypto_ctr_crypt_final(&walk, cipher); |
| 121 | err = skcipher_walk_done(&walk, 0); |
Herbert Xu | 0971eb0 | 2007-11-30 00:23:53 +1100 | [diff] [blame] | 122 | } |
| 123 | |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 124 | return err; |
| 125 | } |
| 126 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 127 | static int crypto_ctr_create(struct crypto_template *tmpl, struct rtattr **tb) |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 128 | { |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 129 | struct skcipher_instance *inst; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 130 | struct crypto_alg *alg; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 131 | int err; |
| 132 | |
Herbert Xu | b3c16bf | 2019-12-20 13:29:40 +0800 | [diff] [blame] | 133 | inst = skcipher_alloc_instance_simple(tmpl, tb); |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 134 | if (IS_ERR(inst)) |
| 135 | return PTR_ERR(inst); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 136 | |
Herbert Xu | b3c16bf | 2019-12-20 13:29:40 +0800 | [diff] [blame] | 137 | alg = skcipher_ialg_simple(inst); |
| 138 | |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 139 | /* Block size must be >= 4 bytes. */ |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 140 | err = -EINVAL; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 141 | if (alg->cra_blocksize < 4) |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 142 | goto out_free_inst; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 143 | |
Herbert Xu | 3f8214e | 2007-11-20 20:32:56 +0800 | [diff] [blame] | 144 | /* If this is false we'd fail the alignment of crypto_inc. */ |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 145 | if (alg->cra_blocksize % 4) |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 146 | goto out_free_inst; |
Herbert Xu | 3f8214e | 2007-11-20 20:32:56 +0800 | [diff] [blame] | 147 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 148 | /* CTR mode is a stream cipher. */ |
| 149 | inst->alg.base.cra_blocksize = 1; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 150 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 151 | /* |
| 152 | * To simplify the implementation, configure the skcipher walk to only |
| 153 | * give a partial block at the very end, never earlier. |
| 154 | */ |
| 155 | inst->alg.chunksize = alg->cra_blocksize; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 156 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 157 | inst->alg.encrypt = crypto_ctr_crypt; |
| 158 | inst->alg.decrypt = crypto_ctr_crypt; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 159 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 160 | err = skcipher_register_instance(tmpl, inst); |
Herbert Xu | b3c16bf | 2019-12-20 13:29:40 +0800 | [diff] [blame] | 161 | if (err) { |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 162 | out_free_inst: |
Herbert Xu | b3c16bf | 2019-12-20 13:29:40 +0800 | [diff] [blame] | 163 | inst->free(inst); |
| 164 | } |
| 165 | |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 166 | return err; |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 167 | } |
| 168 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 169 | static int crypto_rfc3686_setkey(struct crypto_skcipher *parent, |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 170 | const u8 *key, unsigned int keylen) |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 171 | { |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 172 | struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(parent); |
| 173 | struct crypto_skcipher *child = ctx->child; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 174 | |
| 175 | /* the nonce is stored in bytes at end of key */ |
| 176 | if (keylen < CTR_RFC3686_NONCE_SIZE) |
| 177 | return -EINVAL; |
| 178 | |
| 179 | memcpy(ctx->nonce, key + (keylen - CTR_RFC3686_NONCE_SIZE), |
| 180 | CTR_RFC3686_NONCE_SIZE); |
| 181 | |
| 182 | keylen -= CTR_RFC3686_NONCE_SIZE; |
| 183 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 184 | crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
| 185 | crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) & |
| 186 | CRYPTO_TFM_REQ_MASK); |
Eric Biggers | af5034e | 2019-12-30 21:19:38 -0600 | [diff] [blame] | 187 | return crypto_skcipher_setkey(child, key, keylen); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 188 | } |
| 189 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 190 | static int crypto_rfc3686_crypt(struct skcipher_request *req) |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 191 | { |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 192 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| 193 | struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm); |
| 194 | struct crypto_skcipher *child = ctx->child; |
| 195 | unsigned long align = crypto_skcipher_alignmask(tfm); |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 196 | struct crypto_rfc3686_req_ctx *rctx = |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 197 | (void *)PTR_ALIGN((u8 *)skcipher_request_ctx(req), align + 1); |
| 198 | struct skcipher_request *subreq = &rctx->subreq; |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 199 | u8 *iv = rctx->iv; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 200 | |
| 201 | /* set up counter block */ |
| 202 | memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE); |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 203 | memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->iv, CTR_RFC3686_IV_SIZE); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 204 | |
| 205 | /* initialize counter portion of counter block */ |
| 206 | *(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) = |
| 207 | cpu_to_be32(1); |
| 208 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 209 | skcipher_request_set_tfm(subreq, child); |
| 210 | skcipher_request_set_callback(subreq, req->base.flags, |
| 211 | req->base.complete, req->base.data); |
| 212 | skcipher_request_set_crypt(subreq, req->src, req->dst, |
| 213 | req->cryptlen, iv); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 214 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 215 | return crypto_skcipher_encrypt(subreq); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 216 | } |
| 217 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 218 | static int crypto_rfc3686_init_tfm(struct crypto_skcipher *tfm) |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 219 | { |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 220 | struct skcipher_instance *inst = skcipher_alg_instance(tfm); |
| 221 | struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst); |
| 222 | struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm); |
| 223 | struct crypto_skcipher *cipher; |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 224 | unsigned long align; |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 225 | unsigned int reqsize; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 226 | |
Eric Biggers | 60425a8 | 2016-10-28 09:52:19 -0700 | [diff] [blame] | 227 | cipher = crypto_spawn_skcipher(spawn); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 228 | if (IS_ERR(cipher)) |
| 229 | return PTR_ERR(cipher); |
| 230 | |
| 231 | ctx->child = cipher; |
| 232 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 233 | align = crypto_skcipher_alignmask(tfm); |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 234 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 235 | reqsize = align + sizeof(struct crypto_rfc3686_req_ctx) + |
| 236 | crypto_skcipher_reqsize(cipher); |
| 237 | crypto_skcipher_set_reqsize(tfm, reqsize); |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 238 | |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 239 | return 0; |
| 240 | } |
| 241 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 242 | static void crypto_rfc3686_exit_tfm(struct crypto_skcipher *tfm) |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 243 | { |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 244 | struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 245 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 246 | crypto_free_skcipher(ctx->child); |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 247 | } |
| 248 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 249 | static void crypto_rfc3686_free(struct skcipher_instance *inst) |
| 250 | { |
| 251 | struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst); |
| 252 | |
| 253 | crypto_drop_skcipher(spawn); |
| 254 | kfree(inst); |
| 255 | } |
| 256 | |
| 257 | static int crypto_rfc3686_create(struct crypto_template *tmpl, |
| 258 | struct rtattr **tb) |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 259 | { |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 260 | struct skcipher_instance *inst; |
| 261 | struct skcipher_alg *alg; |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 262 | struct crypto_skcipher_spawn *spawn; |
Marcelo Cerri | d2c2a85 | 2017-02-27 09:38:26 -0300 | [diff] [blame] | 263 | u32 mask; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 264 | int err; |
| 265 | |
Eric Biggers | 7bcb2c9 | 2020-07-09 23:20:38 -0700 | [diff] [blame] | 266 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); |
| 267 | if (err) |
| 268 | return err; |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 269 | |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 270 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
| 271 | if (!inst) |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 272 | return -ENOMEM; |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 273 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 274 | spawn = skcipher_instance_ctx(inst); |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 275 | |
Eric Biggers | b9f76dd | 2020-01-02 19:58:45 -0800 | [diff] [blame] | 276 | err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst), |
Eric Biggers | a108dfc | 2020-02-25 20:59:16 -0800 | [diff] [blame] | 277 | crypto_attr_alg_name(tb[1]), 0, mask); |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 278 | if (err) |
| 279 | goto err_free_inst; |
| 280 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 281 | alg = crypto_spawn_skcipher_alg(spawn); |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 282 | |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 283 | /* We only support 16-byte blocks. */ |
| 284 | err = -EINVAL; |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 285 | if (crypto_skcipher_alg_ivsize(alg) != CTR_RFC3686_BLOCK_SIZE) |
Eric Biggers | a108dfc | 2020-02-25 20:59:16 -0800 | [diff] [blame] | 286 | goto err_free_inst; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 287 | |
| 288 | /* Not a stream cipher? */ |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 289 | if (alg->base.cra_blocksize != 1) |
Eric Biggers | a108dfc | 2020-02-25 20:59:16 -0800 | [diff] [blame] | 290 | goto err_free_inst; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 291 | |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 292 | err = -ENAMETOOLONG; |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 293 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| 294 | "rfc3686(%s)", alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) |
Eric Biggers | a108dfc | 2020-02-25 20:59:16 -0800 | [diff] [blame] | 295 | goto err_free_inst; |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 296 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 297 | "rfc3686(%s)", alg->base.cra_driver_name) >= |
| 298 | CRYPTO_MAX_ALG_NAME) |
Eric Biggers | a108dfc | 2020-02-25 20:59:16 -0800 | [diff] [blame] | 299 | goto err_free_inst; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 300 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 301 | inst->alg.base.cra_priority = alg->base.cra_priority; |
| 302 | inst->alg.base.cra_blocksize = 1; |
| 303 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 304 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 305 | inst->alg.ivsize = CTR_RFC3686_IV_SIZE; |
| 306 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg); |
| 307 | inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) + |
| 308 | CTR_RFC3686_NONCE_SIZE; |
| 309 | inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) + |
| 310 | CTR_RFC3686_NONCE_SIZE; |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 311 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 312 | inst->alg.setkey = crypto_rfc3686_setkey; |
| 313 | inst->alg.encrypt = crypto_rfc3686_crypt; |
| 314 | inst->alg.decrypt = crypto_rfc3686_crypt; |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 315 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 316 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx); |
Herbert Xu | 0a27032 | 2007-11-30 21:38:37 +1100 | [diff] [blame] | 317 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 318 | inst->alg.init = crypto_rfc3686_init_tfm; |
| 319 | inst->alg.exit = crypto_rfc3686_exit_tfm; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 320 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 321 | inst->free = crypto_rfc3686_free; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 322 | |
Herbert Xu | b2b39c2 | 2016-07-12 13:17:37 +0800 | [diff] [blame] | 323 | err = skcipher_register_instance(tmpl, inst); |
Eric Biggers | a108dfc | 2020-02-25 20:59:16 -0800 | [diff] [blame] | 324 | if (err) { |
Jussi Kivilinna | 69d3150c | 2012-12-28 12:04:58 +0200 | [diff] [blame] | 325 | err_free_inst: |
Eric Biggers | a108dfc | 2020-02-25 20:59:16 -0800 | [diff] [blame] | 326 | crypto_rfc3686_free(inst); |
| 327 | } |
| 328 | return err; |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 329 | } |
| 330 | |
Xiongfeng Wang | 9f8ef36 | 2019-01-18 13:58:14 +0800 | [diff] [blame] | 331 | static struct crypto_template crypto_ctr_tmpls[] = { |
| 332 | { |
| 333 | .name = "ctr", |
| 334 | .create = crypto_ctr_create, |
| 335 | .module = THIS_MODULE, |
| 336 | }, { |
| 337 | .name = "rfc3686", |
| 338 | .create = crypto_rfc3686_create, |
| 339 | .module = THIS_MODULE, |
| 340 | }, |
Herbert Xu | 5311f24 | 2007-12-17 21:34:32 +0800 | [diff] [blame] | 341 | }; |
| 342 | |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 343 | static int __init crypto_ctr_module_init(void) |
| 344 | { |
Xiongfeng Wang | 9f8ef36 | 2019-01-18 13:58:14 +0800 | [diff] [blame] | 345 | return crypto_register_templates(crypto_ctr_tmpls, |
| 346 | ARRAY_SIZE(crypto_ctr_tmpls)); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | static void __exit crypto_ctr_module_exit(void) |
| 350 | { |
Xiongfeng Wang | 9f8ef36 | 2019-01-18 13:58:14 +0800 | [diff] [blame] | 351 | crypto_unregister_templates(crypto_ctr_tmpls, |
| 352 | ARRAY_SIZE(crypto_ctr_tmpls)); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 353 | } |
| 354 | |
Eric Biggers | c4741b2 | 2019-04-11 21:57:42 -0700 | [diff] [blame] | 355 | subsys_initcall(crypto_ctr_module_init); |
Joy Latten | 23e353c | 2007-10-23 08:50:32 +0800 | [diff] [blame] | 356 | module_exit(crypto_ctr_module_exit); |
| 357 | |
| 358 | MODULE_LICENSE("GPL"); |
Eric Biggers | 11f1463 | 2019-01-03 20:16:17 -0800 | [diff] [blame] | 359 | MODULE_DESCRIPTION("CTR block cipher mode of operation"); |
Kees Cook | 5d26a10 | 2014-11-20 17:05:53 -0800 | [diff] [blame] | 360 | MODULE_ALIAS_CRYPTO("rfc3686"); |
Kees Cook | 4943ba1 | 2014-11-24 16:32:38 -0800 | [diff] [blame] | 361 | MODULE_ALIAS_CRYPTO("ctr"); |
Ard Biesheuvel | 0eb76ba | 2020-12-11 13:27:15 +0100 | [diff] [blame] | 362 | MODULE_IMPORT_NS(CRYPTO_INTERNAL); |