12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 24a49b499SJoy Latten /* 34a49b499SJoy Latten * CCM: Counter with CBC-MAC 44a49b499SJoy Latten * 54a49b499SJoy Latten * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> 64a49b499SJoy Latten */ 74a49b499SJoy Latten 84a49b499SJoy Latten #include <crypto/internal/aead.h> 9f15f05b0SArd Biesheuvel #include <crypto/internal/hash.h> 104a49b499SJoy Latten #include <crypto/internal/skcipher.h> 114a49b499SJoy Latten #include <crypto/scatterwalk.h> 124a49b499SJoy Latten #include <linux/err.h> 134a49b499SJoy Latten #include <linux/init.h> 144a49b499SJoy Latten #include <linux/kernel.h> 154a49b499SJoy Latten #include <linux/module.h> 164a49b499SJoy Latten #include <linux/slab.h> 174a49b499SJoy Latten 184a49b499SJoy Latten struct ccm_instance_ctx { 194a49b499SJoy Latten struct crypto_skcipher_spawn ctr; 20f15f05b0SArd Biesheuvel struct crypto_ahash_spawn mac; 214a49b499SJoy Latten }; 224a49b499SJoy Latten 234a49b499SJoy Latten struct crypto_ccm_ctx { 24f15f05b0SArd Biesheuvel struct crypto_ahash *mac; 25464b93a3SHerbert Xu struct crypto_skcipher *ctr; 264a49b499SJoy Latten }; 274a49b499SJoy Latten 284a49b499SJoy Latten struct crypto_rfc4309_ctx { 294a49b499SJoy Latten struct crypto_aead *child; 304a49b499SJoy Latten u8 nonce[3]; 314a49b499SJoy Latten }; 324a49b499SJoy Latten 3381c4c35eSHerbert Xu struct crypto_rfc4309_req_ctx { 3481c4c35eSHerbert Xu struct scatterlist src[3]; 3581c4c35eSHerbert Xu struct scatterlist dst[3]; 3681c4c35eSHerbert Xu struct aead_request subreq; 3781c4c35eSHerbert Xu }; 3881c4c35eSHerbert Xu 394a49b499SJoy Latten struct crypto_ccm_req_priv_ctx { 404a49b499SJoy Latten u8 odata[16]; 413b30460cSArd Biesheuvel u8 idata[16]; 424a49b499SJoy Latten u8 auth_tag[16]; 434a49b499SJoy Latten u32 flags; 4481c4c35eSHerbert Xu struct scatterlist src[3]; 4581c4c35eSHerbert Xu struct scatterlist dst[3]; 46ebf533adSArd Biesheuvel union { 47ebf533adSArd Biesheuvel struct ahash_request ahreq; 48464b93a3SHerbert Xu struct skcipher_request skreq; 494a49b499SJoy Latten }; 50ebf533adSArd Biesheuvel }; 514a49b499SJoy Latten 52f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx { 53f15f05b0SArd Biesheuvel struct crypto_cipher *child; 54f15f05b0SArd Biesheuvel }; 55f15f05b0SArd Biesheuvel 56f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx { 57f15f05b0SArd Biesheuvel unsigned int len; 58f15f05b0SArd Biesheuvel }; 59f15f05b0SArd Biesheuvel 604a49b499SJoy Latten static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx( 614a49b499SJoy Latten struct aead_request *req) 624a49b499SJoy Latten { 634a49b499SJoy Latten unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); 644a49b499SJoy Latten 654a49b499SJoy Latten return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); 664a49b499SJoy Latten } 674a49b499SJoy Latten 684a49b499SJoy Latten static int set_msg_len(u8 *block, unsigned int msglen, int csize) 694a49b499SJoy Latten { 704a49b499SJoy Latten __be32 data; 714a49b499SJoy Latten 724a49b499SJoy Latten memset(block, 0, csize); 734a49b499SJoy Latten block += csize; 744a49b499SJoy Latten 754a49b499SJoy Latten if (csize >= 4) 764a49b499SJoy Latten csize = 4; 774a49b499SJoy Latten else if (msglen > (1 << (8 * csize))) 784a49b499SJoy Latten return -EOVERFLOW; 794a49b499SJoy Latten 804a49b499SJoy Latten data = cpu_to_be32(msglen); 814a49b499SJoy Latten memcpy(block - csize, (u8 *)&data + 4 - csize, csize); 824a49b499SJoy Latten 834a49b499SJoy Latten return 0; 844a49b499SJoy Latten } 854a49b499SJoy Latten 864a49b499SJoy Latten static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key, 874a49b499SJoy Latten unsigned int keylen) 884a49b499SJoy Latten { 894a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 90464b93a3SHerbert Xu struct crypto_skcipher *ctr = ctx->ctr; 91f15f05b0SArd Biesheuvel struct crypto_ahash *mac = ctx->mac; 92af5034e8SEric Biggers int err; 934a49b499SJoy Latten 94464b93a3SHerbert Xu crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); 95464b93a3SHerbert Xu crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & 964a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 97464b93a3SHerbert Xu err = crypto_skcipher_setkey(ctr, key, keylen); 984a49b499SJoy Latten if (err) 99af5034e8SEric Biggers return err; 1004a49b499SJoy Latten 101f15f05b0SArd Biesheuvel crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK); 102f15f05b0SArd Biesheuvel crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) & 1034a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 104af5034e8SEric Biggers return crypto_ahash_setkey(mac, key, keylen); 1054a49b499SJoy Latten } 1064a49b499SJoy Latten 1074a49b499SJoy Latten static int crypto_ccm_setauthsize(struct crypto_aead *tfm, 1084a49b499SJoy Latten unsigned int authsize) 1094a49b499SJoy Latten { 1104a49b499SJoy Latten switch (authsize) { 1114a49b499SJoy Latten case 4: 1124a49b499SJoy Latten case 6: 1134a49b499SJoy Latten case 8: 1144a49b499SJoy Latten case 10: 1154a49b499SJoy Latten case 12: 1164a49b499SJoy Latten case 14: 1174a49b499SJoy Latten case 16: 1184a49b499SJoy Latten break; 1194a49b499SJoy Latten default: 1204a49b499SJoy Latten return -EINVAL; 1214a49b499SJoy Latten } 1224a49b499SJoy Latten 1234a49b499SJoy Latten return 0; 1244a49b499SJoy Latten } 1254a49b499SJoy Latten 1264a49b499SJoy Latten static int format_input(u8 *info, struct aead_request *req, 1274a49b499SJoy Latten unsigned int cryptlen) 1284a49b499SJoy Latten { 1294a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 1304a49b499SJoy Latten unsigned int lp = req->iv[0]; 1314a49b499SJoy Latten unsigned int l = lp + 1; 1324a49b499SJoy Latten unsigned int m; 1334a49b499SJoy Latten 1344a49b499SJoy Latten m = crypto_aead_authsize(aead); 1354a49b499SJoy Latten 1364a49b499SJoy Latten memcpy(info, req->iv, 16); 1374a49b499SJoy Latten 1384a49b499SJoy Latten /* format control info per RFC 3610 and 1394a49b499SJoy Latten * NIST Special Publication 800-38C 1404a49b499SJoy Latten */ 1414a49b499SJoy Latten *info |= (8 * ((m - 2) / 2)); 1424a49b499SJoy Latten if (req->assoclen) 1434a49b499SJoy Latten *info |= 64; 1444a49b499SJoy Latten 1454a49b499SJoy Latten return set_msg_len(info + 16 - l, cryptlen, l); 1464a49b499SJoy Latten } 1474a49b499SJoy Latten 1484a49b499SJoy Latten static int format_adata(u8 *adata, unsigned int a) 1494a49b499SJoy Latten { 1504a49b499SJoy Latten int len = 0; 1514a49b499SJoy Latten 1524a49b499SJoy Latten /* add control info for associated data 1534a49b499SJoy Latten * RFC 3610 and NIST Special Publication 800-38C 1544a49b499SJoy Latten */ 1554a49b499SJoy Latten if (a < 65280) { 1564a49b499SJoy Latten *(__be16 *)adata = cpu_to_be16(a); 1574a49b499SJoy Latten len = 2; 1584a49b499SJoy Latten } else { 1594a49b499SJoy Latten *(__be16 *)adata = cpu_to_be16(0xfffe); 1604a49b499SJoy Latten *(__be32 *)&adata[2] = cpu_to_be32(a); 1614a49b499SJoy Latten len = 6; 1624a49b499SJoy Latten } 1634a49b499SJoy Latten 1644a49b499SJoy Latten return len; 1654a49b499SJoy Latten } 1664a49b499SJoy Latten 1674a49b499SJoy Latten static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain, 1684a49b499SJoy Latten unsigned int cryptlen) 1694a49b499SJoy Latten { 170f15f05b0SArd Biesheuvel struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 1714a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 1724a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 173ebf533adSArd Biesheuvel struct ahash_request *ahreq = &pctx->ahreq; 1744a49b499SJoy Latten unsigned int assoclen = req->assoclen; 175f15f05b0SArd Biesheuvel struct scatterlist sg[3]; 1763b30460cSArd Biesheuvel u8 *odata = pctx->odata; 1773b30460cSArd Biesheuvel u8 *idata = pctx->idata; 178f15f05b0SArd Biesheuvel int ilen, err; 1794a49b499SJoy Latten 1804a49b499SJoy Latten /* format control data for input */ 1814a49b499SJoy Latten err = format_input(odata, req, cryptlen); 1824a49b499SJoy Latten if (err) 1834a49b499SJoy Latten goto out; 1844a49b499SJoy Latten 185f15f05b0SArd Biesheuvel sg_init_table(sg, 3); 186f15f05b0SArd Biesheuvel sg_set_buf(&sg[0], odata, 16); 1874a49b499SJoy Latten 1884a49b499SJoy Latten /* format associated data and compute into mac */ 1894a49b499SJoy Latten if (assoclen) { 190f15f05b0SArd Biesheuvel ilen = format_adata(idata, assoclen); 191f15f05b0SArd Biesheuvel sg_set_buf(&sg[1], idata, ilen); 192f15f05b0SArd Biesheuvel sg_chain(sg, 3, req->src); 193516280e7SJarod Wilson } else { 194f15f05b0SArd Biesheuvel ilen = 0; 195f15f05b0SArd Biesheuvel sg_chain(sg, 2, req->src); 1964a49b499SJoy Latten } 1974a49b499SJoy Latten 198f15f05b0SArd Biesheuvel ahash_request_set_tfm(ahreq, ctx->mac); 199f15f05b0SArd Biesheuvel ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL); 200f15f05b0SArd Biesheuvel ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16); 201f15f05b0SArd Biesheuvel err = crypto_ahash_init(ahreq); 202f15f05b0SArd Biesheuvel if (err) 203f15f05b0SArd Biesheuvel goto out; 204f15f05b0SArd Biesheuvel err = crypto_ahash_update(ahreq); 205f15f05b0SArd Biesheuvel if (err) 206f15f05b0SArd Biesheuvel goto out; 2074a49b499SJoy Latten 208f15f05b0SArd Biesheuvel /* we need to pad the MAC input to a round multiple of the block size */ 209f15f05b0SArd Biesheuvel ilen = 16 - (assoclen + ilen) % 16; 210f15f05b0SArd Biesheuvel if (ilen < 16) { 211f15f05b0SArd Biesheuvel memset(idata, 0, ilen); 212f15f05b0SArd Biesheuvel sg_init_table(sg, 2); 213f15f05b0SArd Biesheuvel sg_set_buf(&sg[0], idata, ilen); 214f15f05b0SArd Biesheuvel if (plain) 215f15f05b0SArd Biesheuvel sg_chain(sg, 2, plain); 216f15f05b0SArd Biesheuvel plain = sg; 217f15f05b0SArd Biesheuvel cryptlen += ilen; 218f15f05b0SArd Biesheuvel } 219f15f05b0SArd Biesheuvel 220f15f05b0SArd Biesheuvel ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen); 221f15f05b0SArd Biesheuvel err = crypto_ahash_finup(ahreq); 2224a49b499SJoy Latten out: 2234a49b499SJoy Latten return err; 2244a49b499SJoy Latten } 2254a49b499SJoy Latten 2264a49b499SJoy Latten static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err) 2274a49b499SJoy Latten { 2284a49b499SJoy Latten struct aead_request *req = areq->data; 2294a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 2304a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 2314a49b499SJoy Latten u8 *odata = pctx->odata; 2324a49b499SJoy Latten 2334a49b499SJoy Latten if (!err) 23481c4c35eSHerbert Xu scatterwalk_map_and_copy(odata, req->dst, 23581c4c35eSHerbert Xu req->assoclen + req->cryptlen, 2364a49b499SJoy Latten crypto_aead_authsize(aead), 1); 2374a49b499SJoy Latten aead_request_complete(req, err); 2384a49b499SJoy Latten } 2394a49b499SJoy Latten 2404a49b499SJoy Latten static inline int crypto_ccm_check_iv(const u8 *iv) 2414a49b499SJoy Latten { 2424a49b499SJoy Latten /* 2 <= L <= 8, so 1 <= L' <= 7. */ 2434a49b499SJoy Latten if (1 > iv[0] || iv[0] > 7) 2444a49b499SJoy Latten return -EINVAL; 2454a49b499SJoy Latten 2464a49b499SJoy Latten return 0; 2474a49b499SJoy Latten } 2484a49b499SJoy Latten 24981c4c35eSHerbert Xu static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag) 25081c4c35eSHerbert Xu { 25181c4c35eSHerbert Xu struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 25281c4c35eSHerbert Xu struct scatterlist *sg; 25381c4c35eSHerbert Xu u8 *iv = req->iv; 25481c4c35eSHerbert Xu int err; 25581c4c35eSHerbert Xu 25681c4c35eSHerbert Xu err = crypto_ccm_check_iv(iv); 25781c4c35eSHerbert Xu if (err) 25881c4c35eSHerbert Xu return err; 25981c4c35eSHerbert Xu 26081c4c35eSHerbert Xu pctx->flags = aead_request_flags(req); 26181c4c35eSHerbert Xu 26281c4c35eSHerbert Xu /* Note: rfc 3610 and NIST 800-38C require counter of 26381c4c35eSHerbert Xu * zero to encrypt auth tag. 26481c4c35eSHerbert Xu */ 26581c4c35eSHerbert Xu memset(iv + 15 - iv[0], 0, iv[0] + 1); 26681c4c35eSHerbert Xu 26781c4c35eSHerbert Xu sg_init_table(pctx->src, 3); 26881c4c35eSHerbert Xu sg_set_buf(pctx->src, tag, 16); 26981c4c35eSHerbert Xu sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); 27081c4c35eSHerbert Xu if (sg != pctx->src + 1) 27181c4c35eSHerbert Xu sg_chain(pctx->src, 2, sg); 27281c4c35eSHerbert Xu 27381c4c35eSHerbert Xu if (req->src != req->dst) { 27481c4c35eSHerbert Xu sg_init_table(pctx->dst, 3); 27581c4c35eSHerbert Xu sg_set_buf(pctx->dst, tag, 16); 27681c4c35eSHerbert Xu sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); 27781c4c35eSHerbert Xu if (sg != pctx->dst + 1) 27881c4c35eSHerbert Xu sg_chain(pctx->dst, 2, sg); 27981c4c35eSHerbert Xu } 28081c4c35eSHerbert Xu 28181c4c35eSHerbert Xu return 0; 28281c4c35eSHerbert Xu } 28381c4c35eSHerbert Xu 2844a49b499SJoy Latten static int crypto_ccm_encrypt(struct aead_request *req) 2854a49b499SJoy Latten { 2864a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 2874a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 2884a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 289464b93a3SHerbert Xu struct skcipher_request *skreq = &pctx->skreq; 2904a49b499SJoy Latten struct scatterlist *dst; 2914a49b499SJoy Latten unsigned int cryptlen = req->cryptlen; 2924a49b499SJoy Latten u8 *odata = pctx->odata; 2934a49b499SJoy Latten u8 *iv = req->iv; 2944a49b499SJoy Latten int err; 2954a49b499SJoy Latten 29681c4c35eSHerbert Xu err = crypto_ccm_init_crypt(req, odata); 2974a49b499SJoy Latten if (err) 2984a49b499SJoy Latten return err; 2994a49b499SJoy Latten 30081c4c35eSHerbert Xu err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen); 3014a49b499SJoy Latten if (err) 3024a49b499SJoy Latten return err; 3034a49b499SJoy Latten 3044a49b499SJoy Latten dst = pctx->src; 30581c4c35eSHerbert Xu if (req->src != req->dst) 3064a49b499SJoy Latten dst = pctx->dst; 3074a49b499SJoy Latten 308464b93a3SHerbert Xu skcipher_request_set_tfm(skreq, ctx->ctr); 309464b93a3SHerbert Xu skcipher_request_set_callback(skreq, pctx->flags, 3104a49b499SJoy Latten crypto_ccm_encrypt_done, req); 311464b93a3SHerbert Xu skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); 312464b93a3SHerbert Xu err = crypto_skcipher_encrypt(skreq); 3134a49b499SJoy Latten if (err) 3144a49b499SJoy Latten return err; 3154a49b499SJoy Latten 3164a49b499SJoy Latten /* copy authtag to end of dst */ 31781c4c35eSHerbert Xu scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen, 3184a49b499SJoy Latten crypto_aead_authsize(aead), 1); 3194a49b499SJoy Latten return err; 3204a49b499SJoy Latten } 3214a49b499SJoy Latten 3224a49b499SJoy Latten static void crypto_ccm_decrypt_done(struct crypto_async_request *areq, 3234a49b499SJoy Latten int err) 3244a49b499SJoy Latten { 3254a49b499SJoy Latten struct aead_request *req = areq->data; 3264a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 3274a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 3284a49b499SJoy Latten unsigned int authsize = crypto_aead_authsize(aead); 3294a49b499SJoy Latten unsigned int cryptlen = req->cryptlen - authsize; 33081c4c35eSHerbert Xu struct scatterlist *dst; 33181c4c35eSHerbert Xu 33281c4c35eSHerbert Xu pctx->flags = 0; 33381c4c35eSHerbert Xu 33481c4c35eSHerbert Xu dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst); 3354a49b499SJoy Latten 3364a49b499SJoy Latten if (!err) { 33781c4c35eSHerbert Xu err = crypto_ccm_auth(req, dst, cryptlen); 3386bf37e5aSJames Yonan if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize)) 3394a49b499SJoy Latten err = -EBADMSG; 3404a49b499SJoy Latten } 3414a49b499SJoy Latten aead_request_complete(req, err); 3424a49b499SJoy Latten } 3434a49b499SJoy Latten 3444a49b499SJoy Latten static int crypto_ccm_decrypt(struct aead_request *req) 3454a49b499SJoy Latten { 3464a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 3474a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 3484a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 349464b93a3SHerbert Xu struct skcipher_request *skreq = &pctx->skreq; 3504a49b499SJoy Latten struct scatterlist *dst; 3514a49b499SJoy Latten unsigned int authsize = crypto_aead_authsize(aead); 3524a49b499SJoy Latten unsigned int cryptlen = req->cryptlen; 3534a49b499SJoy Latten u8 *authtag = pctx->auth_tag; 3544a49b499SJoy Latten u8 *odata = pctx->odata; 355441f99c9SRomain Izard u8 *iv = pctx->idata; 3564a49b499SJoy Latten int err; 3574a49b499SJoy Latten 3584a49b499SJoy Latten cryptlen -= authsize; 3594a49b499SJoy Latten 36081c4c35eSHerbert Xu err = crypto_ccm_init_crypt(req, authtag); 3614a49b499SJoy Latten if (err) 3624a49b499SJoy Latten return err; 3634a49b499SJoy Latten 36481c4c35eSHerbert Xu scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen, 36581c4c35eSHerbert Xu authsize, 0); 3664a49b499SJoy Latten 3674a49b499SJoy Latten dst = pctx->src; 36881c4c35eSHerbert Xu if (req->src != req->dst) 3694a49b499SJoy Latten dst = pctx->dst; 3704a49b499SJoy Latten 371441f99c9SRomain Izard memcpy(iv, req->iv, 16); 372441f99c9SRomain Izard 373464b93a3SHerbert Xu skcipher_request_set_tfm(skreq, ctx->ctr); 374464b93a3SHerbert Xu skcipher_request_set_callback(skreq, pctx->flags, 3754a49b499SJoy Latten crypto_ccm_decrypt_done, req); 376464b93a3SHerbert Xu skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); 377464b93a3SHerbert Xu err = crypto_skcipher_decrypt(skreq); 3784a49b499SJoy Latten if (err) 3794a49b499SJoy Latten return err; 3804a49b499SJoy Latten 38181c4c35eSHerbert Xu err = crypto_ccm_auth(req, sg_next(dst), cryptlen); 3824a49b499SJoy Latten if (err) 3834a49b499SJoy Latten return err; 3844a49b499SJoy Latten 3854a49b499SJoy Latten /* verify */ 3866bf37e5aSJames Yonan if (crypto_memneq(authtag, odata, authsize)) 3874a49b499SJoy Latten return -EBADMSG; 3884a49b499SJoy Latten 3894a49b499SJoy Latten return err; 3904a49b499SJoy Latten } 3914a49b499SJoy Latten 39281c4c35eSHerbert Xu static int crypto_ccm_init_tfm(struct crypto_aead *tfm) 3934a49b499SJoy Latten { 39481c4c35eSHerbert Xu struct aead_instance *inst = aead_alg_instance(tfm); 39581c4c35eSHerbert Xu struct ccm_instance_ctx *ictx = aead_instance_ctx(inst); 39681c4c35eSHerbert Xu struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); 397f15f05b0SArd Biesheuvel struct crypto_ahash *mac; 398464b93a3SHerbert Xu struct crypto_skcipher *ctr; 3994a49b499SJoy Latten unsigned long align; 4004a49b499SJoy Latten int err; 4014a49b499SJoy Latten 402f15f05b0SArd Biesheuvel mac = crypto_spawn_ahash(&ictx->mac); 403f15f05b0SArd Biesheuvel if (IS_ERR(mac)) 404f15f05b0SArd Biesheuvel return PTR_ERR(mac); 4054a49b499SJoy Latten 40660425a8bSEric Biggers ctr = crypto_spawn_skcipher(&ictx->ctr); 4074a49b499SJoy Latten err = PTR_ERR(ctr); 4084a49b499SJoy Latten if (IS_ERR(ctr)) 409f15f05b0SArd Biesheuvel goto err_free_mac; 4104a49b499SJoy Latten 411f15f05b0SArd Biesheuvel ctx->mac = mac; 4124a49b499SJoy Latten ctx->ctr = ctr; 4134a49b499SJoy Latten 41481c4c35eSHerbert Xu align = crypto_aead_alignmask(tfm); 4154a49b499SJoy Latten align &= ~(crypto_tfm_ctx_alignment() - 1); 41681c4c35eSHerbert Xu crypto_aead_set_reqsize( 41781c4c35eSHerbert Xu tfm, 4182c221ad3SHerbert Xu align + sizeof(struct crypto_ccm_req_priv_ctx) + 419ebf533adSArd Biesheuvel max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr))); 4204a49b499SJoy Latten 4214a49b499SJoy Latten return 0; 4224a49b499SJoy Latten 423f15f05b0SArd Biesheuvel err_free_mac: 424f15f05b0SArd Biesheuvel crypto_free_ahash(mac); 4254a49b499SJoy Latten return err; 4264a49b499SJoy Latten } 4274a49b499SJoy Latten 42881c4c35eSHerbert Xu static void crypto_ccm_exit_tfm(struct crypto_aead *tfm) 4294a49b499SJoy Latten { 43081c4c35eSHerbert Xu struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); 4314a49b499SJoy Latten 432f15f05b0SArd Biesheuvel crypto_free_ahash(ctx->mac); 433464b93a3SHerbert Xu crypto_free_skcipher(ctx->ctr); 4344a49b499SJoy Latten } 4354a49b499SJoy Latten 43681c4c35eSHerbert Xu static void crypto_ccm_free(struct aead_instance *inst) 43781c4c35eSHerbert Xu { 43881c4c35eSHerbert Xu struct ccm_instance_ctx *ctx = aead_instance_ctx(inst); 43981c4c35eSHerbert Xu 440f15f05b0SArd Biesheuvel crypto_drop_ahash(&ctx->mac); 44181c4c35eSHerbert Xu crypto_drop_skcipher(&ctx->ctr); 44281c4c35eSHerbert Xu kfree(inst); 44381c4c35eSHerbert Xu } 44481c4c35eSHerbert Xu 44581c4c35eSHerbert Xu static int crypto_ccm_create_common(struct crypto_template *tmpl, 44681c4c35eSHerbert Xu struct rtattr **tb, 4474a49b499SJoy Latten const char *ctr_name, 448f15f05b0SArd Biesheuvel const char *mac_name) 4494a49b499SJoy Latten { 4504a49b499SJoy Latten struct crypto_attr_type *algt; 451b9f76dddSEric Biggers u32 mask; 45281c4c35eSHerbert Xu struct aead_instance *inst; 4534a49b499SJoy Latten struct ccm_instance_ctx *ictx; 45405b3bbb5SEric Biggers struct skcipher_alg *ctr; 45505b3bbb5SEric Biggers struct hash_alg_common *mac; 4564a49b499SJoy Latten int err; 4574a49b499SJoy Latten 4584a49b499SJoy Latten algt = crypto_get_attr_type(tb); 4594a49b499SJoy Latten if (IS_ERR(algt)) 46081c4c35eSHerbert Xu return PTR_ERR(algt); 4614a49b499SJoy Latten 4625e4b8c1fSHerbert Xu if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 46381c4c35eSHerbert Xu return -EINVAL; 4644a49b499SJoy Latten 465b9f76dddSEric Biggers mask = crypto_requires_sync(algt->type, algt->mask); 466b9f76dddSEric Biggers 46705b3bbb5SEric Biggers inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); 46805b3bbb5SEric Biggers if (!inst) 46905b3bbb5SEric Biggers return -ENOMEM; 47005b3bbb5SEric Biggers ictx = aead_instance_ctx(inst); 4714a49b499SJoy Latten 47205b3bbb5SEric Biggers err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst), 47305b3bbb5SEric Biggers mac_name, 0, CRYPTO_ALG_ASYNC); 47405b3bbb5SEric Biggers if (err) 47505b3bbb5SEric Biggers goto err_free_inst; 47605b3bbb5SEric Biggers mac = crypto_spawn_ahash_alg(&ictx->mac); 47705b3bbb5SEric Biggers 4784a49b499SJoy Latten err = -EINVAL; 4796a1faa4aSEric Biggers if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 || 4806a1faa4aSEric Biggers mac->digestsize != 16) 4814a49b499SJoy Latten goto err_free_inst; 4824a49b499SJoy Latten 483b9f76dddSEric Biggers err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst), 484b9f76dddSEric Biggers ctr_name, 0, mask); 4854a49b499SJoy Latten if (err) 48605b3bbb5SEric Biggers goto err_free_inst; 487464b93a3SHerbert Xu ctr = crypto_spawn_skcipher_alg(&ictx->ctr); 4884a49b499SJoy Latten 4896a1faa4aSEric Biggers /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ 4904a49b499SJoy Latten err = -EINVAL; 4916a1faa4aSEric Biggers if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || 4926a1faa4aSEric Biggers crypto_skcipher_alg_ivsize(ctr) != 16 || 4936a1faa4aSEric Biggers ctr->base.cra_blocksize != 1) 49405b3bbb5SEric Biggers goto err_free_inst; 4954a49b499SJoy Latten 4966a1faa4aSEric Biggers /* ctr and cbcmac must use the same underlying block cipher. */ 4976a1faa4aSEric Biggers if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0) 49805b3bbb5SEric Biggers goto err_free_inst; 4994a49b499SJoy Latten 5004a49b499SJoy Latten err = -ENAMETOOLONG; 5016a1faa4aSEric Biggers if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 5026a1faa4aSEric Biggers "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) 50305b3bbb5SEric Biggers goto err_free_inst; 5046a1faa4aSEric Biggers 50581c4c35eSHerbert Xu if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, 506464b93a3SHerbert Xu "ccm_base(%s,%s)", ctr->base.cra_driver_name, 507f15f05b0SArd Biesheuvel mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 50805b3bbb5SEric Biggers goto err_free_inst; 5094a49b499SJoy Latten 510464b93a3SHerbert Xu inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC; 511f15f05b0SArd Biesheuvel inst->alg.base.cra_priority = (mac->base.cra_priority + 512464b93a3SHerbert Xu ctr->base.cra_priority) / 2; 51381c4c35eSHerbert Xu inst->alg.base.cra_blocksize = 1; 514f15f05b0SArd Biesheuvel inst->alg.base.cra_alignmask = mac->base.cra_alignmask | 5155ba8e2a0SArd Biesheuvel ctr->base.cra_alignmask; 51681c4c35eSHerbert Xu inst->alg.ivsize = 16; 517464b93a3SHerbert Xu inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); 51881c4c35eSHerbert Xu inst->alg.maxauthsize = 16; 51981c4c35eSHerbert Xu inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx); 52081c4c35eSHerbert Xu inst->alg.init = crypto_ccm_init_tfm; 52181c4c35eSHerbert Xu inst->alg.exit = crypto_ccm_exit_tfm; 52281c4c35eSHerbert Xu inst->alg.setkey = crypto_ccm_setkey; 52381c4c35eSHerbert Xu inst->alg.setauthsize = crypto_ccm_setauthsize; 52481c4c35eSHerbert Xu inst->alg.encrypt = crypto_ccm_encrypt; 52581c4c35eSHerbert Xu inst->alg.decrypt = crypto_ccm_decrypt; 5264a49b499SJoy Latten 52781c4c35eSHerbert Xu inst->free = crypto_ccm_free; 52881c4c35eSHerbert Xu 52981c4c35eSHerbert Xu err = aead_register_instance(tmpl, inst); 53005b3bbb5SEric Biggers if (err) { 5314a49b499SJoy Latten err_free_inst: 53205b3bbb5SEric Biggers crypto_ccm_free(inst); 53305b3bbb5SEric Biggers } 53405b3bbb5SEric Biggers return err; 5354a49b499SJoy Latten } 5364a49b499SJoy Latten 53781c4c35eSHerbert Xu static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb) 5384a49b499SJoy Latten { 5394a49b499SJoy Latten const char *cipher_name; 5404a49b499SJoy Latten char ctr_name[CRYPTO_MAX_ALG_NAME]; 541f15f05b0SArd Biesheuvel char mac_name[CRYPTO_MAX_ALG_NAME]; 5424a49b499SJoy Latten 5434a49b499SJoy Latten cipher_name = crypto_attr_alg_name(tb[1]); 5444a49b499SJoy Latten if (IS_ERR(cipher_name)) 54581c4c35eSHerbert Xu return PTR_ERR(cipher_name); 5464a49b499SJoy Latten 5474a49b499SJoy Latten if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", 5484a49b499SJoy Latten cipher_name) >= CRYPTO_MAX_ALG_NAME) 54981c4c35eSHerbert Xu return -ENAMETOOLONG; 5504a49b499SJoy Latten 551f15f05b0SArd Biesheuvel if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)", 552f15f05b0SArd Biesheuvel cipher_name) >= CRYPTO_MAX_ALG_NAME) 553f15f05b0SArd Biesheuvel return -ENAMETOOLONG; 554f15f05b0SArd Biesheuvel 5556a1faa4aSEric Biggers return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); 5564a49b499SJoy Latten } 5574a49b499SJoy Latten 55881c4c35eSHerbert Xu static int crypto_ccm_base_create(struct crypto_template *tmpl, 55981c4c35eSHerbert Xu struct rtattr **tb) 5604a49b499SJoy Latten { 5614a49b499SJoy Latten const char *ctr_name; 5626a1faa4aSEric Biggers const char *mac_name; 5634a49b499SJoy Latten 5644a49b499SJoy Latten ctr_name = crypto_attr_alg_name(tb[1]); 5654a49b499SJoy Latten if (IS_ERR(ctr_name)) 56681c4c35eSHerbert Xu return PTR_ERR(ctr_name); 5674a49b499SJoy Latten 5686a1faa4aSEric Biggers mac_name = crypto_attr_alg_name(tb[2]); 5696a1faa4aSEric Biggers if (IS_ERR(mac_name)) 5706a1faa4aSEric Biggers return PTR_ERR(mac_name); 5714a49b499SJoy Latten 5726a1faa4aSEric Biggers return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); 5734a49b499SJoy Latten } 5744a49b499SJoy Latten 5754a49b499SJoy Latten static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key, 5764a49b499SJoy Latten unsigned int keylen) 5774a49b499SJoy Latten { 5784a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); 5794a49b499SJoy Latten struct crypto_aead *child = ctx->child; 5804a49b499SJoy Latten 5814a49b499SJoy Latten if (keylen < 3) 5824a49b499SJoy Latten return -EINVAL; 5834a49b499SJoy Latten 5844a49b499SJoy Latten keylen -= 3; 5854a49b499SJoy Latten memcpy(ctx->nonce, key + keylen, 3); 5864a49b499SJoy Latten 5874a49b499SJoy Latten crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); 5884a49b499SJoy Latten crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & 5894a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 590af5034e8SEric Biggers return crypto_aead_setkey(child, key, keylen); 5914a49b499SJoy Latten } 5924a49b499SJoy Latten 5934a49b499SJoy Latten static int crypto_rfc4309_setauthsize(struct crypto_aead *parent, 5944a49b499SJoy Latten unsigned int authsize) 5954a49b499SJoy Latten { 5964a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); 5974a49b499SJoy Latten 5984a49b499SJoy Latten switch (authsize) { 5994a49b499SJoy Latten case 8: 6004a49b499SJoy Latten case 12: 6014a49b499SJoy Latten case 16: 6024a49b499SJoy Latten break; 6034a49b499SJoy Latten default: 6044a49b499SJoy Latten return -EINVAL; 6054a49b499SJoy Latten } 6064a49b499SJoy Latten 6074a49b499SJoy Latten return crypto_aead_setauthsize(ctx->child, authsize); 6084a49b499SJoy Latten } 6094a49b499SJoy Latten 6104a49b499SJoy Latten static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req) 6114a49b499SJoy Latten { 61281c4c35eSHerbert Xu struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req); 61381c4c35eSHerbert Xu struct aead_request *subreq = &rctx->subreq; 6144a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 6154a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead); 6164a49b499SJoy Latten struct crypto_aead *child = ctx->child; 61781c4c35eSHerbert Xu struct scatterlist *sg; 6184a49b499SJoy Latten u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), 6194a49b499SJoy Latten crypto_aead_alignmask(child) + 1); 6204a49b499SJoy Latten 6214a49b499SJoy Latten /* L' */ 6224a49b499SJoy Latten iv[0] = 3; 6234a49b499SJoy Latten 6244a49b499SJoy Latten memcpy(iv + 1, ctx->nonce, 3); 6254a49b499SJoy Latten memcpy(iv + 4, req->iv, 8); 6264a49b499SJoy Latten 62781c4c35eSHerbert Xu scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0); 62881c4c35eSHerbert Xu 62981c4c35eSHerbert Xu sg_init_table(rctx->src, 3); 63081c4c35eSHerbert Xu sg_set_buf(rctx->src, iv + 16, req->assoclen - 8); 63181c4c35eSHerbert Xu sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); 63281c4c35eSHerbert Xu if (sg != rctx->src + 1) 63381c4c35eSHerbert Xu sg_chain(rctx->src, 2, sg); 63481c4c35eSHerbert Xu 63581c4c35eSHerbert Xu if (req->src != req->dst) { 63681c4c35eSHerbert Xu sg_init_table(rctx->dst, 3); 63781c4c35eSHerbert Xu sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8); 63881c4c35eSHerbert Xu sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); 63981c4c35eSHerbert Xu if (sg != rctx->dst + 1) 64081c4c35eSHerbert Xu sg_chain(rctx->dst, 2, sg); 64181c4c35eSHerbert Xu } 64281c4c35eSHerbert Xu 6434a49b499SJoy Latten aead_request_set_tfm(subreq, child); 6444a49b499SJoy Latten aead_request_set_callback(subreq, req->base.flags, req->base.complete, 6454a49b499SJoy Latten req->base.data); 64681c4c35eSHerbert Xu aead_request_set_crypt(subreq, rctx->src, 64781c4c35eSHerbert Xu req->src == req->dst ? rctx->src : rctx->dst, 64881c4c35eSHerbert Xu req->cryptlen, iv); 64981c4c35eSHerbert Xu aead_request_set_ad(subreq, req->assoclen - 8); 6504a49b499SJoy Latten 6514a49b499SJoy Latten return subreq; 6524a49b499SJoy Latten } 6534a49b499SJoy Latten 6544a49b499SJoy Latten static int crypto_rfc4309_encrypt(struct aead_request *req) 6554a49b499SJoy Latten { 65681c4c35eSHerbert Xu if (req->assoclen != 16 && req->assoclen != 20) 65781c4c35eSHerbert Xu return -EINVAL; 65881c4c35eSHerbert Xu 6594a49b499SJoy Latten req = crypto_rfc4309_crypt(req); 6604a49b499SJoy Latten 6614a49b499SJoy Latten return crypto_aead_encrypt(req); 6624a49b499SJoy Latten } 6634a49b499SJoy Latten 6644a49b499SJoy Latten static int crypto_rfc4309_decrypt(struct aead_request *req) 6654a49b499SJoy Latten { 66681c4c35eSHerbert Xu if (req->assoclen != 16 && req->assoclen != 20) 66781c4c35eSHerbert Xu return -EINVAL; 66881c4c35eSHerbert Xu 6694a49b499SJoy Latten req = crypto_rfc4309_crypt(req); 6704a49b499SJoy Latten 6714a49b499SJoy Latten return crypto_aead_decrypt(req); 6724a49b499SJoy Latten } 6734a49b499SJoy Latten 67481c4c35eSHerbert Xu static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm) 6754a49b499SJoy Latten { 67681c4c35eSHerbert Xu struct aead_instance *inst = aead_alg_instance(tfm); 67781c4c35eSHerbert Xu struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); 67881c4c35eSHerbert Xu struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); 6794a49b499SJoy Latten struct crypto_aead *aead; 6804a49b499SJoy Latten unsigned long align; 6814a49b499SJoy Latten 6824a49b499SJoy Latten aead = crypto_spawn_aead(spawn); 6834a49b499SJoy Latten if (IS_ERR(aead)) 6844a49b499SJoy Latten return PTR_ERR(aead); 6854a49b499SJoy Latten 6864a49b499SJoy Latten ctx->child = aead; 6874a49b499SJoy Latten 6884a49b499SJoy Latten align = crypto_aead_alignmask(aead); 6894a49b499SJoy Latten align &= ~(crypto_tfm_ctx_alignment() - 1); 69081c4c35eSHerbert Xu crypto_aead_set_reqsize( 69181c4c35eSHerbert Xu tfm, 69281c4c35eSHerbert Xu sizeof(struct crypto_rfc4309_req_ctx) + 6932c221ad3SHerbert Xu ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + 69481c4c35eSHerbert Xu align + 32); 6954a49b499SJoy Latten 6964a49b499SJoy Latten return 0; 6974a49b499SJoy Latten } 6984a49b499SJoy Latten 69981c4c35eSHerbert Xu static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm) 7004a49b499SJoy Latten { 70181c4c35eSHerbert Xu struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); 7024a49b499SJoy Latten 7034a49b499SJoy Latten crypto_free_aead(ctx->child); 7044a49b499SJoy Latten } 7054a49b499SJoy Latten 70681c4c35eSHerbert Xu static void crypto_rfc4309_free(struct aead_instance *inst) 70781c4c35eSHerbert Xu { 70881c4c35eSHerbert Xu crypto_drop_aead(aead_instance_ctx(inst)); 70981c4c35eSHerbert Xu kfree(inst); 71081c4c35eSHerbert Xu } 71181c4c35eSHerbert Xu 71281c4c35eSHerbert Xu static int crypto_rfc4309_create(struct crypto_template *tmpl, 71381c4c35eSHerbert Xu struct rtattr **tb) 7144a49b499SJoy Latten { 7154a49b499SJoy Latten struct crypto_attr_type *algt; 716cd900f0cSEric Biggers u32 mask; 71781c4c35eSHerbert Xu struct aead_instance *inst; 7184a49b499SJoy Latten struct crypto_aead_spawn *spawn; 71981c4c35eSHerbert Xu struct aead_alg *alg; 7204a49b499SJoy Latten const char *ccm_name; 7214a49b499SJoy Latten int err; 7224a49b499SJoy Latten 7234a49b499SJoy Latten algt = crypto_get_attr_type(tb); 7244a49b499SJoy Latten if (IS_ERR(algt)) 72581c4c35eSHerbert Xu return PTR_ERR(algt); 7264a49b499SJoy Latten 7275e4b8c1fSHerbert Xu if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 72881c4c35eSHerbert Xu return -EINVAL; 7294a49b499SJoy Latten 730cd900f0cSEric Biggers mask = crypto_requires_sync(algt->type, algt->mask); 731cd900f0cSEric Biggers 7324a49b499SJoy Latten ccm_name = crypto_attr_alg_name(tb[1]); 7334a49b499SJoy Latten if (IS_ERR(ccm_name)) 73481c4c35eSHerbert Xu return PTR_ERR(ccm_name); 7354a49b499SJoy Latten 7364a49b499SJoy Latten inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 7374a49b499SJoy Latten if (!inst) 73881c4c35eSHerbert Xu return -ENOMEM; 7394a49b499SJoy Latten 74081c4c35eSHerbert Xu spawn = aead_instance_ctx(inst); 741cd900f0cSEric Biggers err = crypto_grab_aead(spawn, aead_crypto_instance(inst), 742cd900f0cSEric Biggers ccm_name, 0, mask); 7434a49b499SJoy Latten if (err) 7444a49b499SJoy Latten goto out_free_inst; 7454a49b499SJoy Latten 74681c4c35eSHerbert Xu alg = crypto_spawn_aead_alg(spawn); 7474a49b499SJoy Latten 7484a49b499SJoy Latten err = -EINVAL; 7494a49b499SJoy Latten 7504a49b499SJoy Latten /* We only support 16-byte blocks. */ 75181c4c35eSHerbert Xu if (crypto_aead_alg_ivsize(alg) != 16) 7524a49b499SJoy Latten goto out_drop_alg; 7534a49b499SJoy Latten 7544a49b499SJoy Latten /* Not a stream cipher? */ 75581c4c35eSHerbert Xu if (alg->base.cra_blocksize != 1) 7564a49b499SJoy Latten goto out_drop_alg; 7574a49b499SJoy Latten 7584a49b499SJoy Latten err = -ENAMETOOLONG; 75981c4c35eSHerbert Xu if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 76081c4c35eSHerbert Xu "rfc4309(%s)", alg->base.cra_name) >= 76181c4c35eSHerbert Xu CRYPTO_MAX_ALG_NAME || 76281c4c35eSHerbert Xu snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, 76381c4c35eSHerbert Xu "rfc4309(%s)", alg->base.cra_driver_name) >= 7644a49b499SJoy Latten CRYPTO_MAX_ALG_NAME) 7654a49b499SJoy Latten goto out_drop_alg; 7664a49b499SJoy Latten 76781c4c35eSHerbert Xu inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; 76881c4c35eSHerbert Xu inst->alg.base.cra_priority = alg->base.cra_priority; 76981c4c35eSHerbert Xu inst->alg.base.cra_blocksize = 1; 77081c4c35eSHerbert Xu inst->alg.base.cra_alignmask = alg->base.cra_alignmask; 7714a49b499SJoy Latten 77281c4c35eSHerbert Xu inst->alg.ivsize = 8; 773464b93a3SHerbert Xu inst->alg.chunksize = crypto_aead_alg_chunksize(alg); 77481c4c35eSHerbert Xu inst->alg.maxauthsize = 16; 7754a49b499SJoy Latten 77681c4c35eSHerbert Xu inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); 7774a49b499SJoy Latten 77881c4c35eSHerbert Xu inst->alg.init = crypto_rfc4309_init_tfm; 77981c4c35eSHerbert Xu inst->alg.exit = crypto_rfc4309_exit_tfm; 7804a49b499SJoy Latten 78181c4c35eSHerbert Xu inst->alg.setkey = crypto_rfc4309_setkey; 78281c4c35eSHerbert Xu inst->alg.setauthsize = crypto_rfc4309_setauthsize; 78381c4c35eSHerbert Xu inst->alg.encrypt = crypto_rfc4309_encrypt; 78481c4c35eSHerbert Xu inst->alg.decrypt = crypto_rfc4309_decrypt; 7854a49b499SJoy Latten 78681c4c35eSHerbert Xu inst->free = crypto_rfc4309_free; 78781c4c35eSHerbert Xu 78881c4c35eSHerbert Xu err = aead_register_instance(tmpl, inst); 78981c4c35eSHerbert Xu if (err) 79081c4c35eSHerbert Xu goto out_drop_alg; 7914a49b499SJoy Latten 7924a49b499SJoy Latten out: 79381c4c35eSHerbert Xu return err; 7944a49b499SJoy Latten 7954a49b499SJoy Latten out_drop_alg: 7964a49b499SJoy Latten crypto_drop_aead(spawn); 7974a49b499SJoy Latten out_free_inst: 7984a49b499SJoy Latten kfree(inst); 7994a49b499SJoy Latten goto out; 8004a49b499SJoy Latten } 8014a49b499SJoy Latten 802f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent, 803f15f05b0SArd Biesheuvel const u8 *inkey, unsigned int keylen) 804f15f05b0SArd Biesheuvel { 805f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent); 806f15f05b0SArd Biesheuvel 807f15f05b0SArd Biesheuvel return crypto_cipher_setkey(ctx->child, inkey, keylen); 808f15f05b0SArd Biesheuvel } 809f15f05b0SArd Biesheuvel 810f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_init(struct shash_desc *pdesc) 811f15f05b0SArd Biesheuvel { 812f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 813f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(pdesc->tfm); 8145338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs; 815f15f05b0SArd Biesheuvel 816f15f05b0SArd Biesheuvel ctx->len = 0; 8175338ad70SArd Biesheuvel memset(dg, 0, bs); 818f15f05b0SArd Biesheuvel 819f15f05b0SArd Biesheuvel return 0; 820f15f05b0SArd Biesheuvel } 821f15f05b0SArd Biesheuvel 822f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p, 823f15f05b0SArd Biesheuvel unsigned int len) 824f15f05b0SArd Biesheuvel { 825f15f05b0SArd Biesheuvel struct crypto_shash *parent = pdesc->tfm; 826f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); 827f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 828f15f05b0SArd Biesheuvel struct crypto_cipher *tfm = tctx->child; 829f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(parent); 8305338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; 831f15f05b0SArd Biesheuvel 832f15f05b0SArd Biesheuvel while (len > 0) { 833f15f05b0SArd Biesheuvel unsigned int l = min(len, bs - ctx->len); 834f15f05b0SArd Biesheuvel 8355338ad70SArd Biesheuvel crypto_xor(dg + ctx->len, p, l); 836f15f05b0SArd Biesheuvel ctx->len +=l; 837f15f05b0SArd Biesheuvel len -= l; 838f15f05b0SArd Biesheuvel p += l; 839f15f05b0SArd Biesheuvel 840f15f05b0SArd Biesheuvel if (ctx->len == bs) { 8415338ad70SArd Biesheuvel crypto_cipher_encrypt_one(tfm, dg, dg); 842f15f05b0SArd Biesheuvel ctx->len = 0; 843f15f05b0SArd Biesheuvel } 844f15f05b0SArd Biesheuvel } 845f15f05b0SArd Biesheuvel 846f15f05b0SArd Biesheuvel return 0; 847f15f05b0SArd Biesheuvel } 848f15f05b0SArd Biesheuvel 849f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out) 850f15f05b0SArd Biesheuvel { 851f15f05b0SArd Biesheuvel struct crypto_shash *parent = pdesc->tfm; 852f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); 853f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 854f15f05b0SArd Biesheuvel struct crypto_cipher *tfm = tctx->child; 855f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(parent); 8565338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; 857f15f05b0SArd Biesheuvel 858f15f05b0SArd Biesheuvel if (ctx->len) 8595338ad70SArd Biesheuvel crypto_cipher_encrypt_one(tfm, dg, dg); 860f15f05b0SArd Biesheuvel 8615338ad70SArd Biesheuvel memcpy(out, dg, bs); 862f15f05b0SArd Biesheuvel return 0; 863f15f05b0SArd Biesheuvel } 864f15f05b0SArd Biesheuvel 865f15f05b0SArd Biesheuvel static int cbcmac_init_tfm(struct crypto_tfm *tfm) 866f15f05b0SArd Biesheuvel { 867f15f05b0SArd Biesheuvel struct crypto_cipher *cipher; 868f15f05b0SArd Biesheuvel struct crypto_instance *inst = (void *)tfm->__crt_alg; 869f15f05b0SArd Biesheuvel struct crypto_spawn *spawn = crypto_instance_ctx(inst); 870f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 871f15f05b0SArd Biesheuvel 872f15f05b0SArd Biesheuvel cipher = crypto_spawn_cipher(spawn); 873f15f05b0SArd Biesheuvel if (IS_ERR(cipher)) 874f15f05b0SArd Biesheuvel return PTR_ERR(cipher); 875f15f05b0SArd Biesheuvel 876f15f05b0SArd Biesheuvel ctx->child = cipher; 877f15f05b0SArd Biesheuvel 878f15f05b0SArd Biesheuvel return 0; 879f15f05b0SArd Biesheuvel }; 880f15f05b0SArd Biesheuvel 881f15f05b0SArd Biesheuvel static void cbcmac_exit_tfm(struct crypto_tfm *tfm) 882f15f05b0SArd Biesheuvel { 883f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 884f15f05b0SArd Biesheuvel crypto_free_cipher(ctx->child); 885f15f05b0SArd Biesheuvel } 886f15f05b0SArd Biesheuvel 887f15f05b0SArd Biesheuvel static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb) 888f15f05b0SArd Biesheuvel { 889f15f05b0SArd Biesheuvel struct shash_instance *inst; 890f15f05b0SArd Biesheuvel struct crypto_alg *alg; 891f15f05b0SArd Biesheuvel int err; 892f15f05b0SArd Biesheuvel 893f15f05b0SArd Biesheuvel err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); 894f15f05b0SArd Biesheuvel if (err) 895f15f05b0SArd Biesheuvel return err; 896f15f05b0SArd Biesheuvel 897f15f05b0SArd Biesheuvel alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, 898f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_MASK); 899f15f05b0SArd Biesheuvel if (IS_ERR(alg)) 900f15f05b0SArd Biesheuvel return PTR_ERR(alg); 901f15f05b0SArd Biesheuvel 902f15f05b0SArd Biesheuvel inst = shash_alloc_instance("cbcmac", alg); 903f15f05b0SArd Biesheuvel err = PTR_ERR(inst); 904f15f05b0SArd Biesheuvel if (IS_ERR(inst)) 905f15f05b0SArd Biesheuvel goto out_put_alg; 906f15f05b0SArd Biesheuvel 907f15f05b0SArd Biesheuvel err = crypto_init_spawn(shash_instance_ctx(inst), alg, 908f15f05b0SArd Biesheuvel shash_crypto_instance(inst), 909f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_MASK); 910f15f05b0SArd Biesheuvel if (err) 911f15f05b0SArd Biesheuvel goto out_free_inst; 912f15f05b0SArd Biesheuvel 913f15f05b0SArd Biesheuvel inst->alg.base.cra_priority = alg->cra_priority; 914f15f05b0SArd Biesheuvel inst->alg.base.cra_blocksize = 1; 915f15f05b0SArd Biesheuvel 916f15f05b0SArd Biesheuvel inst->alg.digestsize = alg->cra_blocksize; 9175338ad70SArd Biesheuvel inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx), 9185338ad70SArd Biesheuvel alg->cra_alignmask + 1) + 919f15f05b0SArd Biesheuvel alg->cra_blocksize; 920f15f05b0SArd Biesheuvel 921f15f05b0SArd Biesheuvel inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx); 922f15f05b0SArd Biesheuvel inst->alg.base.cra_init = cbcmac_init_tfm; 923f15f05b0SArd Biesheuvel inst->alg.base.cra_exit = cbcmac_exit_tfm; 924f15f05b0SArd Biesheuvel 925f15f05b0SArd Biesheuvel inst->alg.init = crypto_cbcmac_digest_init; 926f15f05b0SArd Biesheuvel inst->alg.update = crypto_cbcmac_digest_update; 927f15f05b0SArd Biesheuvel inst->alg.final = crypto_cbcmac_digest_final; 928f15f05b0SArd Biesheuvel inst->alg.setkey = crypto_cbcmac_digest_setkey; 929f15f05b0SArd Biesheuvel 930f15f05b0SArd Biesheuvel err = shash_register_instance(tmpl, inst); 931f15f05b0SArd Biesheuvel 932f15f05b0SArd Biesheuvel out_free_inst: 933f15f05b0SArd Biesheuvel if (err) 934f15f05b0SArd Biesheuvel shash_free_instance(shash_crypto_instance(inst)); 935f15f05b0SArd Biesheuvel 936f15f05b0SArd Biesheuvel out_put_alg: 937f15f05b0SArd Biesheuvel crypto_mod_put(alg); 938f15f05b0SArd Biesheuvel return err; 939f15f05b0SArd Biesheuvel } 940f15f05b0SArd Biesheuvel 9410db19035SXiongfeng Wang static struct crypto_template crypto_ccm_tmpls[] = { 9420db19035SXiongfeng Wang { 943f15f05b0SArd Biesheuvel .name = "cbcmac", 944f15f05b0SArd Biesheuvel .create = cbcmac_create, 945f15f05b0SArd Biesheuvel .free = shash_free_instance, 946f15f05b0SArd Biesheuvel .module = THIS_MODULE, 9470db19035SXiongfeng Wang }, { 9480db19035SXiongfeng Wang .name = "ccm_base", 9490db19035SXiongfeng Wang .create = crypto_ccm_base_create, 9500db19035SXiongfeng Wang .module = THIS_MODULE, 9510db19035SXiongfeng Wang }, { 9520db19035SXiongfeng Wang .name = "ccm", 9530db19035SXiongfeng Wang .create = crypto_ccm_create, 9540db19035SXiongfeng Wang .module = THIS_MODULE, 9550db19035SXiongfeng Wang }, { 9560db19035SXiongfeng Wang .name = "rfc4309", 9570db19035SXiongfeng Wang .create = crypto_rfc4309_create, 9580db19035SXiongfeng Wang .module = THIS_MODULE, 9590db19035SXiongfeng Wang }, 960f15f05b0SArd Biesheuvel }; 961f15f05b0SArd Biesheuvel 9624a49b499SJoy Latten static int __init crypto_ccm_module_init(void) 9634a49b499SJoy Latten { 9640db19035SXiongfeng Wang return crypto_register_templates(crypto_ccm_tmpls, 9650db19035SXiongfeng Wang ARRAY_SIZE(crypto_ccm_tmpls)); 9664a49b499SJoy Latten } 9674a49b499SJoy Latten 9684a49b499SJoy Latten static void __exit crypto_ccm_module_exit(void) 9694a49b499SJoy Latten { 9700db19035SXiongfeng Wang crypto_unregister_templates(crypto_ccm_tmpls, 9710db19035SXiongfeng Wang ARRAY_SIZE(crypto_ccm_tmpls)); 9724a49b499SJoy Latten } 9734a49b499SJoy Latten 974c4741b23SEric Biggers subsys_initcall(crypto_ccm_module_init); 9754a49b499SJoy Latten module_exit(crypto_ccm_module_exit); 9764a49b499SJoy Latten 9774a49b499SJoy Latten MODULE_LICENSE("GPL"); 9784a49b499SJoy Latten MODULE_DESCRIPTION("Counter with CBC MAC"); 9795d26a105SKees Cook MODULE_ALIAS_CRYPTO("ccm_base"); 9805d26a105SKees Cook MODULE_ALIAS_CRYPTO("rfc4309"); 9814943ba16SKees Cook MODULE_ALIAS_CRYPTO("ccm"); 982ae748b9cSArd Biesheuvel MODULE_ALIAS_CRYPTO("cbcmac"); 983