14a49b499SJoy Latten /* 24a49b499SJoy Latten * CCM: Counter with CBC-MAC 34a49b499SJoy Latten * 44a49b499SJoy Latten * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> 54a49b499SJoy Latten * 64a49b499SJoy Latten * This program is free software; you can redistribute it and/or modify it 74a49b499SJoy Latten * under the terms of the GNU General Public License as published by the Free 84a49b499SJoy Latten * Software Foundation; either version 2 of the License, or (at your option) 94a49b499SJoy Latten * any later version. 104a49b499SJoy Latten * 114a49b499SJoy Latten */ 124a49b499SJoy Latten 134a49b499SJoy Latten #include <crypto/internal/aead.h> 14f15f05b0SArd Biesheuvel #include <crypto/internal/hash.h> 154a49b499SJoy Latten #include <crypto/internal/skcipher.h> 164a49b499SJoy Latten #include <crypto/scatterwalk.h> 174a49b499SJoy Latten #include <linux/err.h> 184a49b499SJoy Latten #include <linux/init.h> 194a49b499SJoy Latten #include <linux/kernel.h> 204a49b499SJoy Latten #include <linux/module.h> 214a49b499SJoy Latten #include <linux/slab.h> 224a49b499SJoy Latten 234a49b499SJoy Latten #include "internal.h" 244a49b499SJoy Latten 254a49b499SJoy Latten struct ccm_instance_ctx { 264a49b499SJoy Latten struct crypto_skcipher_spawn ctr; 27f15f05b0SArd Biesheuvel struct crypto_ahash_spawn mac; 284a49b499SJoy Latten }; 294a49b499SJoy Latten 304a49b499SJoy Latten struct crypto_ccm_ctx { 31f15f05b0SArd Biesheuvel struct crypto_ahash *mac; 32464b93a3SHerbert Xu struct crypto_skcipher *ctr; 334a49b499SJoy Latten }; 344a49b499SJoy Latten 354a49b499SJoy Latten struct crypto_rfc4309_ctx { 364a49b499SJoy Latten struct crypto_aead *child; 374a49b499SJoy Latten u8 nonce[3]; 384a49b499SJoy Latten }; 394a49b499SJoy Latten 4081c4c35eSHerbert Xu struct crypto_rfc4309_req_ctx { 4181c4c35eSHerbert Xu struct scatterlist src[3]; 4281c4c35eSHerbert Xu struct scatterlist dst[3]; 4381c4c35eSHerbert Xu struct aead_request subreq; 4481c4c35eSHerbert Xu }; 4581c4c35eSHerbert Xu 464a49b499SJoy Latten struct crypto_ccm_req_priv_ctx { 474a49b499SJoy Latten u8 odata[16]; 484a49b499SJoy Latten u8 auth_tag[16]; 494a49b499SJoy Latten u32 flags; 5081c4c35eSHerbert Xu struct scatterlist src[3]; 5181c4c35eSHerbert Xu struct scatterlist dst[3]; 52464b93a3SHerbert Xu struct skcipher_request skreq; 534a49b499SJoy Latten }; 544a49b499SJoy Latten 55f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx { 56f15f05b0SArd Biesheuvel struct crypto_cipher *child; 57f15f05b0SArd Biesheuvel }; 58f15f05b0SArd Biesheuvel 59f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx { 60f15f05b0SArd Biesheuvel unsigned int len; 61f15f05b0SArd Biesheuvel }; 62f15f05b0SArd Biesheuvel 634a49b499SJoy Latten static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx( 644a49b499SJoy Latten struct aead_request *req) 654a49b499SJoy Latten { 664a49b499SJoy Latten unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); 674a49b499SJoy Latten 684a49b499SJoy Latten return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); 694a49b499SJoy Latten } 704a49b499SJoy Latten 714a49b499SJoy Latten static int set_msg_len(u8 *block, unsigned int msglen, int csize) 724a49b499SJoy Latten { 734a49b499SJoy Latten __be32 data; 744a49b499SJoy Latten 754a49b499SJoy Latten memset(block, 0, csize); 764a49b499SJoy Latten block += csize; 774a49b499SJoy Latten 784a49b499SJoy Latten if (csize >= 4) 794a49b499SJoy Latten csize = 4; 804a49b499SJoy Latten else if (msglen > (1 << (8 * csize))) 814a49b499SJoy Latten return -EOVERFLOW; 824a49b499SJoy Latten 834a49b499SJoy Latten data = cpu_to_be32(msglen); 844a49b499SJoy Latten memcpy(block - csize, (u8 *)&data + 4 - csize, csize); 854a49b499SJoy Latten 864a49b499SJoy Latten return 0; 874a49b499SJoy Latten } 884a49b499SJoy Latten 894a49b499SJoy Latten static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key, 904a49b499SJoy Latten unsigned int keylen) 914a49b499SJoy Latten { 924a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 93464b93a3SHerbert Xu struct crypto_skcipher *ctr = ctx->ctr; 94f15f05b0SArd Biesheuvel struct crypto_ahash *mac = ctx->mac; 954a49b499SJoy Latten int err = 0; 964a49b499SJoy Latten 97464b93a3SHerbert Xu crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); 98464b93a3SHerbert Xu crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & 994a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 100464b93a3SHerbert Xu err = crypto_skcipher_setkey(ctr, key, keylen); 101464b93a3SHerbert Xu crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) & 1024a49b499SJoy Latten CRYPTO_TFM_RES_MASK); 1034a49b499SJoy Latten if (err) 1044a49b499SJoy Latten goto out; 1054a49b499SJoy Latten 106f15f05b0SArd Biesheuvel crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK); 107f15f05b0SArd Biesheuvel crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) & 1084a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 109f15f05b0SArd Biesheuvel err = crypto_ahash_setkey(mac, key, keylen); 110f15f05b0SArd Biesheuvel crypto_aead_set_flags(aead, crypto_ahash_get_flags(mac) & 1114a49b499SJoy Latten CRYPTO_TFM_RES_MASK); 1124a49b499SJoy Latten 1134a49b499SJoy Latten out: 1144a49b499SJoy Latten return err; 1154a49b499SJoy Latten } 1164a49b499SJoy Latten 1174a49b499SJoy Latten static int crypto_ccm_setauthsize(struct crypto_aead *tfm, 1184a49b499SJoy Latten unsigned int authsize) 1194a49b499SJoy Latten { 1204a49b499SJoy Latten switch (authsize) { 1214a49b499SJoy Latten case 4: 1224a49b499SJoy Latten case 6: 1234a49b499SJoy Latten case 8: 1244a49b499SJoy Latten case 10: 1254a49b499SJoy Latten case 12: 1264a49b499SJoy Latten case 14: 1274a49b499SJoy Latten case 16: 1284a49b499SJoy Latten break; 1294a49b499SJoy Latten default: 1304a49b499SJoy Latten return -EINVAL; 1314a49b499SJoy Latten } 1324a49b499SJoy Latten 1334a49b499SJoy Latten return 0; 1344a49b499SJoy Latten } 1354a49b499SJoy Latten 1364a49b499SJoy Latten static int format_input(u8 *info, struct aead_request *req, 1374a49b499SJoy Latten unsigned int cryptlen) 1384a49b499SJoy Latten { 1394a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 1404a49b499SJoy Latten unsigned int lp = req->iv[0]; 1414a49b499SJoy Latten unsigned int l = lp + 1; 1424a49b499SJoy Latten unsigned int m; 1434a49b499SJoy Latten 1444a49b499SJoy Latten m = crypto_aead_authsize(aead); 1454a49b499SJoy Latten 1464a49b499SJoy Latten memcpy(info, req->iv, 16); 1474a49b499SJoy Latten 1484a49b499SJoy Latten /* format control info per RFC 3610 and 1494a49b499SJoy Latten * NIST Special Publication 800-38C 1504a49b499SJoy Latten */ 1514a49b499SJoy Latten *info |= (8 * ((m - 2) / 2)); 1524a49b499SJoy Latten if (req->assoclen) 1534a49b499SJoy Latten *info |= 64; 1544a49b499SJoy Latten 1554a49b499SJoy Latten return set_msg_len(info + 16 - l, cryptlen, l); 1564a49b499SJoy Latten } 1574a49b499SJoy Latten 1584a49b499SJoy Latten static int format_adata(u8 *adata, unsigned int a) 1594a49b499SJoy Latten { 1604a49b499SJoy Latten int len = 0; 1614a49b499SJoy Latten 1624a49b499SJoy Latten /* add control info for associated data 1634a49b499SJoy Latten * RFC 3610 and NIST Special Publication 800-38C 1644a49b499SJoy Latten */ 1654a49b499SJoy Latten if (a < 65280) { 1664a49b499SJoy Latten *(__be16 *)adata = cpu_to_be16(a); 1674a49b499SJoy Latten len = 2; 1684a49b499SJoy Latten } else { 1694a49b499SJoy Latten *(__be16 *)adata = cpu_to_be16(0xfffe); 1704a49b499SJoy Latten *(__be32 *)&adata[2] = cpu_to_be32(a); 1714a49b499SJoy Latten len = 6; 1724a49b499SJoy Latten } 1734a49b499SJoy Latten 1744a49b499SJoy Latten return len; 1754a49b499SJoy Latten } 1764a49b499SJoy Latten 1774a49b499SJoy Latten static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain, 1784a49b499SJoy Latten unsigned int cryptlen) 1794a49b499SJoy Latten { 180f15f05b0SArd Biesheuvel struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 1814a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 1824a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 183f15f05b0SArd Biesheuvel AHASH_REQUEST_ON_STACK(ahreq, ctx->mac); 1844a49b499SJoy Latten unsigned int assoclen = req->assoclen; 185f15f05b0SArd Biesheuvel struct scatterlist sg[3]; 186f15f05b0SArd Biesheuvel u8 odata[16]; 187f15f05b0SArd Biesheuvel u8 idata[16]; 188f15f05b0SArd Biesheuvel int ilen, err; 1894a49b499SJoy Latten 1904a49b499SJoy Latten /* format control data for input */ 1914a49b499SJoy Latten err = format_input(odata, req, cryptlen); 1924a49b499SJoy Latten if (err) 1934a49b499SJoy Latten goto out; 1944a49b499SJoy Latten 195f15f05b0SArd Biesheuvel sg_init_table(sg, 3); 196f15f05b0SArd Biesheuvel sg_set_buf(&sg[0], odata, 16); 1974a49b499SJoy Latten 1984a49b499SJoy Latten /* format associated data and compute into mac */ 1994a49b499SJoy Latten if (assoclen) { 200f15f05b0SArd Biesheuvel ilen = format_adata(idata, assoclen); 201f15f05b0SArd Biesheuvel sg_set_buf(&sg[1], idata, ilen); 202f15f05b0SArd Biesheuvel sg_chain(sg, 3, req->src); 203516280e7SJarod Wilson } else { 204f15f05b0SArd Biesheuvel ilen = 0; 205f15f05b0SArd Biesheuvel sg_chain(sg, 2, req->src); 2064a49b499SJoy Latten } 2074a49b499SJoy Latten 208f15f05b0SArd Biesheuvel ahash_request_set_tfm(ahreq, ctx->mac); 209f15f05b0SArd Biesheuvel ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL); 210f15f05b0SArd Biesheuvel ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16); 211f15f05b0SArd Biesheuvel err = crypto_ahash_init(ahreq); 212f15f05b0SArd Biesheuvel if (err) 213f15f05b0SArd Biesheuvel goto out; 214f15f05b0SArd Biesheuvel err = crypto_ahash_update(ahreq); 215f15f05b0SArd Biesheuvel if (err) 216f15f05b0SArd Biesheuvel goto out; 2174a49b499SJoy Latten 218f15f05b0SArd Biesheuvel /* we need to pad the MAC input to a round multiple of the block size */ 219f15f05b0SArd Biesheuvel ilen = 16 - (assoclen + ilen) % 16; 220f15f05b0SArd Biesheuvel if (ilen < 16) { 221f15f05b0SArd Biesheuvel memset(idata, 0, ilen); 222f15f05b0SArd Biesheuvel sg_init_table(sg, 2); 223f15f05b0SArd Biesheuvel sg_set_buf(&sg[0], idata, ilen); 224f15f05b0SArd Biesheuvel if (plain) 225f15f05b0SArd Biesheuvel sg_chain(sg, 2, plain); 226f15f05b0SArd Biesheuvel plain = sg; 227f15f05b0SArd Biesheuvel cryptlen += ilen; 228f15f05b0SArd Biesheuvel } 229f15f05b0SArd Biesheuvel 230f15f05b0SArd Biesheuvel ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen); 231f15f05b0SArd Biesheuvel err = crypto_ahash_finup(ahreq); 2324a49b499SJoy Latten out: 2334a49b499SJoy Latten return err; 2344a49b499SJoy Latten } 2354a49b499SJoy Latten 2364a49b499SJoy Latten static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err) 2374a49b499SJoy Latten { 2384a49b499SJoy Latten struct aead_request *req = areq->data; 2394a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 2404a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 2414a49b499SJoy Latten u8 *odata = pctx->odata; 2424a49b499SJoy Latten 2434a49b499SJoy Latten if (!err) 24481c4c35eSHerbert Xu scatterwalk_map_and_copy(odata, req->dst, 24581c4c35eSHerbert Xu req->assoclen + req->cryptlen, 2464a49b499SJoy Latten crypto_aead_authsize(aead), 1); 2474a49b499SJoy Latten aead_request_complete(req, err); 2484a49b499SJoy Latten } 2494a49b499SJoy Latten 2504a49b499SJoy Latten static inline int crypto_ccm_check_iv(const u8 *iv) 2514a49b499SJoy Latten { 2524a49b499SJoy Latten /* 2 <= L <= 8, so 1 <= L' <= 7. */ 2534a49b499SJoy Latten if (1 > iv[0] || iv[0] > 7) 2544a49b499SJoy Latten return -EINVAL; 2554a49b499SJoy Latten 2564a49b499SJoy Latten return 0; 2574a49b499SJoy Latten } 2584a49b499SJoy Latten 25981c4c35eSHerbert Xu static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag) 26081c4c35eSHerbert Xu { 26181c4c35eSHerbert Xu struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 26281c4c35eSHerbert Xu struct scatterlist *sg; 26381c4c35eSHerbert Xu u8 *iv = req->iv; 26481c4c35eSHerbert Xu int err; 26581c4c35eSHerbert Xu 26681c4c35eSHerbert Xu err = crypto_ccm_check_iv(iv); 26781c4c35eSHerbert Xu if (err) 26881c4c35eSHerbert Xu return err; 26981c4c35eSHerbert Xu 27081c4c35eSHerbert Xu pctx->flags = aead_request_flags(req); 27181c4c35eSHerbert Xu 27281c4c35eSHerbert Xu /* Note: rfc 3610 and NIST 800-38C require counter of 27381c4c35eSHerbert Xu * zero to encrypt auth tag. 27481c4c35eSHerbert Xu */ 27581c4c35eSHerbert Xu memset(iv + 15 - iv[0], 0, iv[0] + 1); 27681c4c35eSHerbert Xu 27781c4c35eSHerbert Xu sg_init_table(pctx->src, 3); 27881c4c35eSHerbert Xu sg_set_buf(pctx->src, tag, 16); 27981c4c35eSHerbert Xu sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); 28081c4c35eSHerbert Xu if (sg != pctx->src + 1) 28181c4c35eSHerbert Xu sg_chain(pctx->src, 2, sg); 28281c4c35eSHerbert Xu 28381c4c35eSHerbert Xu if (req->src != req->dst) { 28481c4c35eSHerbert Xu sg_init_table(pctx->dst, 3); 28581c4c35eSHerbert Xu sg_set_buf(pctx->dst, tag, 16); 28681c4c35eSHerbert Xu sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); 28781c4c35eSHerbert Xu if (sg != pctx->dst + 1) 28881c4c35eSHerbert Xu sg_chain(pctx->dst, 2, sg); 28981c4c35eSHerbert Xu } 29081c4c35eSHerbert Xu 29181c4c35eSHerbert Xu return 0; 29281c4c35eSHerbert Xu } 29381c4c35eSHerbert Xu 2944a49b499SJoy Latten static int crypto_ccm_encrypt(struct aead_request *req) 2954a49b499SJoy Latten { 2964a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 2974a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 2984a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 299464b93a3SHerbert Xu struct skcipher_request *skreq = &pctx->skreq; 3004a49b499SJoy Latten struct scatterlist *dst; 3014a49b499SJoy Latten unsigned int cryptlen = req->cryptlen; 3024a49b499SJoy Latten u8 *odata = pctx->odata; 3034a49b499SJoy Latten u8 *iv = req->iv; 3044a49b499SJoy Latten int err; 3054a49b499SJoy Latten 30681c4c35eSHerbert Xu err = crypto_ccm_init_crypt(req, odata); 3074a49b499SJoy Latten if (err) 3084a49b499SJoy Latten return err; 3094a49b499SJoy Latten 31081c4c35eSHerbert Xu err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen); 3114a49b499SJoy Latten if (err) 3124a49b499SJoy Latten return err; 3134a49b499SJoy Latten 3144a49b499SJoy Latten dst = pctx->src; 31581c4c35eSHerbert Xu if (req->src != req->dst) 3164a49b499SJoy Latten dst = pctx->dst; 3174a49b499SJoy Latten 318464b93a3SHerbert Xu skcipher_request_set_tfm(skreq, ctx->ctr); 319464b93a3SHerbert Xu skcipher_request_set_callback(skreq, pctx->flags, 3204a49b499SJoy Latten crypto_ccm_encrypt_done, req); 321464b93a3SHerbert Xu skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); 322464b93a3SHerbert Xu err = crypto_skcipher_encrypt(skreq); 3234a49b499SJoy Latten if (err) 3244a49b499SJoy Latten return err; 3254a49b499SJoy Latten 3264a49b499SJoy Latten /* copy authtag to end of dst */ 32781c4c35eSHerbert Xu scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen, 3284a49b499SJoy Latten crypto_aead_authsize(aead), 1); 3294a49b499SJoy Latten return err; 3304a49b499SJoy Latten } 3314a49b499SJoy Latten 3324a49b499SJoy Latten static void crypto_ccm_decrypt_done(struct crypto_async_request *areq, 3334a49b499SJoy Latten int err) 3344a49b499SJoy Latten { 3354a49b499SJoy Latten struct aead_request *req = areq->data; 3364a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 3374a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 3384a49b499SJoy Latten unsigned int authsize = crypto_aead_authsize(aead); 3394a49b499SJoy Latten unsigned int cryptlen = req->cryptlen - authsize; 34081c4c35eSHerbert Xu struct scatterlist *dst; 34181c4c35eSHerbert Xu 34281c4c35eSHerbert Xu pctx->flags = 0; 34381c4c35eSHerbert Xu 34481c4c35eSHerbert Xu dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst); 3454a49b499SJoy Latten 3464a49b499SJoy Latten if (!err) { 34781c4c35eSHerbert Xu err = crypto_ccm_auth(req, dst, cryptlen); 3486bf37e5aSJames Yonan if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize)) 3494a49b499SJoy Latten err = -EBADMSG; 3504a49b499SJoy Latten } 3514a49b499SJoy Latten aead_request_complete(req, err); 3524a49b499SJoy Latten } 3534a49b499SJoy Latten 3544a49b499SJoy Latten static int crypto_ccm_decrypt(struct aead_request *req) 3554a49b499SJoy Latten { 3564a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 3574a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 3584a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 359464b93a3SHerbert Xu struct skcipher_request *skreq = &pctx->skreq; 3604a49b499SJoy Latten struct scatterlist *dst; 3614a49b499SJoy Latten unsigned int authsize = crypto_aead_authsize(aead); 3624a49b499SJoy Latten unsigned int cryptlen = req->cryptlen; 3634a49b499SJoy Latten u8 *authtag = pctx->auth_tag; 3644a49b499SJoy Latten u8 *odata = pctx->odata; 3654a49b499SJoy Latten u8 *iv = req->iv; 3664a49b499SJoy Latten int err; 3674a49b499SJoy Latten 3684a49b499SJoy Latten cryptlen -= authsize; 3694a49b499SJoy Latten 37081c4c35eSHerbert Xu err = crypto_ccm_init_crypt(req, authtag); 3714a49b499SJoy Latten if (err) 3724a49b499SJoy Latten return err; 3734a49b499SJoy Latten 37481c4c35eSHerbert Xu scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen, 37581c4c35eSHerbert Xu authsize, 0); 3764a49b499SJoy Latten 3774a49b499SJoy Latten dst = pctx->src; 37881c4c35eSHerbert Xu if (req->src != req->dst) 3794a49b499SJoy Latten dst = pctx->dst; 3804a49b499SJoy Latten 381464b93a3SHerbert Xu skcipher_request_set_tfm(skreq, ctx->ctr); 382464b93a3SHerbert Xu skcipher_request_set_callback(skreq, pctx->flags, 3834a49b499SJoy Latten crypto_ccm_decrypt_done, req); 384464b93a3SHerbert Xu skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); 385464b93a3SHerbert Xu err = crypto_skcipher_decrypt(skreq); 3864a49b499SJoy Latten if (err) 3874a49b499SJoy Latten return err; 3884a49b499SJoy Latten 38981c4c35eSHerbert Xu err = crypto_ccm_auth(req, sg_next(dst), cryptlen); 3904a49b499SJoy Latten if (err) 3914a49b499SJoy Latten return err; 3924a49b499SJoy Latten 3934a49b499SJoy Latten /* verify */ 3946bf37e5aSJames Yonan if (crypto_memneq(authtag, odata, authsize)) 3954a49b499SJoy Latten return -EBADMSG; 3964a49b499SJoy Latten 3974a49b499SJoy Latten return err; 3984a49b499SJoy Latten } 3994a49b499SJoy Latten 40081c4c35eSHerbert Xu static int crypto_ccm_init_tfm(struct crypto_aead *tfm) 4014a49b499SJoy Latten { 40281c4c35eSHerbert Xu struct aead_instance *inst = aead_alg_instance(tfm); 40381c4c35eSHerbert Xu struct ccm_instance_ctx *ictx = aead_instance_ctx(inst); 40481c4c35eSHerbert Xu struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); 405f15f05b0SArd Biesheuvel struct crypto_ahash *mac; 406464b93a3SHerbert Xu struct crypto_skcipher *ctr; 4074a49b499SJoy Latten unsigned long align; 4084a49b499SJoy Latten int err; 4094a49b499SJoy Latten 410f15f05b0SArd Biesheuvel mac = crypto_spawn_ahash(&ictx->mac); 411f15f05b0SArd Biesheuvel if (IS_ERR(mac)) 412f15f05b0SArd Biesheuvel return PTR_ERR(mac); 4134a49b499SJoy Latten 41460425a8bSEric Biggers ctr = crypto_spawn_skcipher(&ictx->ctr); 4154a49b499SJoy Latten err = PTR_ERR(ctr); 4164a49b499SJoy Latten if (IS_ERR(ctr)) 417f15f05b0SArd Biesheuvel goto err_free_mac; 4184a49b499SJoy Latten 419f15f05b0SArd Biesheuvel ctx->mac = mac; 4204a49b499SJoy Latten ctx->ctr = ctr; 4214a49b499SJoy Latten 42281c4c35eSHerbert Xu align = crypto_aead_alignmask(tfm); 4234a49b499SJoy Latten align &= ~(crypto_tfm_ctx_alignment() - 1); 42481c4c35eSHerbert Xu crypto_aead_set_reqsize( 42581c4c35eSHerbert Xu tfm, 4262c221ad3SHerbert Xu align + sizeof(struct crypto_ccm_req_priv_ctx) + 427464b93a3SHerbert Xu crypto_skcipher_reqsize(ctr)); 4284a49b499SJoy Latten 4294a49b499SJoy Latten return 0; 4304a49b499SJoy Latten 431f15f05b0SArd Biesheuvel err_free_mac: 432f15f05b0SArd Biesheuvel crypto_free_ahash(mac); 4334a49b499SJoy Latten return err; 4344a49b499SJoy Latten } 4354a49b499SJoy Latten 43681c4c35eSHerbert Xu static void crypto_ccm_exit_tfm(struct crypto_aead *tfm) 4374a49b499SJoy Latten { 43881c4c35eSHerbert Xu struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); 4394a49b499SJoy Latten 440f15f05b0SArd Biesheuvel crypto_free_ahash(ctx->mac); 441464b93a3SHerbert Xu crypto_free_skcipher(ctx->ctr); 4424a49b499SJoy Latten } 4434a49b499SJoy Latten 44481c4c35eSHerbert Xu static void crypto_ccm_free(struct aead_instance *inst) 44581c4c35eSHerbert Xu { 44681c4c35eSHerbert Xu struct ccm_instance_ctx *ctx = aead_instance_ctx(inst); 44781c4c35eSHerbert Xu 448f15f05b0SArd Biesheuvel crypto_drop_ahash(&ctx->mac); 44981c4c35eSHerbert Xu crypto_drop_skcipher(&ctx->ctr); 45081c4c35eSHerbert Xu kfree(inst); 45181c4c35eSHerbert Xu } 45281c4c35eSHerbert Xu 45381c4c35eSHerbert Xu static int crypto_ccm_create_common(struct crypto_template *tmpl, 45481c4c35eSHerbert Xu struct rtattr **tb, 4554a49b499SJoy Latten const char *full_name, 4564a49b499SJoy Latten const char *ctr_name, 457f15f05b0SArd Biesheuvel const char *mac_name) 4584a49b499SJoy Latten { 4594a49b499SJoy Latten struct crypto_attr_type *algt; 46081c4c35eSHerbert Xu struct aead_instance *inst; 461464b93a3SHerbert Xu struct skcipher_alg *ctr; 462f15f05b0SArd Biesheuvel struct crypto_alg *mac_alg; 463f15f05b0SArd Biesheuvel struct hash_alg_common *mac; 4644a49b499SJoy Latten struct ccm_instance_ctx *ictx; 4654a49b499SJoy Latten int err; 4664a49b499SJoy Latten 4674a49b499SJoy Latten algt = crypto_get_attr_type(tb); 4684a49b499SJoy Latten if (IS_ERR(algt)) 46981c4c35eSHerbert Xu return PTR_ERR(algt); 4704a49b499SJoy Latten 4715e4b8c1fSHerbert Xu if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 47281c4c35eSHerbert Xu return -EINVAL; 4734a49b499SJoy Latten 474f15f05b0SArd Biesheuvel mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type, 475f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_HASH, 476f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_AHASH_MASK | 477f15f05b0SArd Biesheuvel CRYPTO_ALG_ASYNC); 478f15f05b0SArd Biesheuvel if (IS_ERR(mac_alg)) 479f15f05b0SArd Biesheuvel return PTR_ERR(mac_alg); 4804a49b499SJoy Latten 481f15f05b0SArd Biesheuvel mac = __crypto_hash_alg_common(mac_alg); 4824a49b499SJoy Latten err = -EINVAL; 483f15f05b0SArd Biesheuvel if (mac->digestsize != 16) 484f15f05b0SArd Biesheuvel goto out_put_mac; 4854a49b499SJoy Latten 4864a49b499SJoy Latten inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); 4874a49b499SJoy Latten err = -ENOMEM; 4884a49b499SJoy Latten if (!inst) 489f15f05b0SArd Biesheuvel goto out_put_mac; 4904a49b499SJoy Latten 49181c4c35eSHerbert Xu ictx = aead_instance_ctx(inst); 492f15f05b0SArd Biesheuvel err = crypto_init_ahash_spawn(&ictx->mac, mac, 493f15f05b0SArd Biesheuvel aead_crypto_instance(inst)); 4944a49b499SJoy Latten if (err) 4954a49b499SJoy Latten goto err_free_inst; 4964a49b499SJoy Latten 49781c4c35eSHerbert Xu crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst)); 498a35528ecSEric Biggers err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0, 4994a49b499SJoy Latten crypto_requires_sync(algt->type, 5004a49b499SJoy Latten algt->mask)); 5014a49b499SJoy Latten if (err) 502f15f05b0SArd Biesheuvel goto err_drop_mac; 5034a49b499SJoy Latten 504464b93a3SHerbert Xu ctr = crypto_spawn_skcipher_alg(&ictx->ctr); 5054a49b499SJoy Latten 5064a49b499SJoy Latten /* Not a stream cipher? */ 5074a49b499SJoy Latten err = -EINVAL; 508464b93a3SHerbert Xu if (ctr->base.cra_blocksize != 1) 5094a49b499SJoy Latten goto err_drop_ctr; 5104a49b499SJoy Latten 5114a49b499SJoy Latten /* We want the real thing! */ 512464b93a3SHerbert Xu if (crypto_skcipher_alg_ivsize(ctr) != 16) 5134a49b499SJoy Latten goto err_drop_ctr; 5144a49b499SJoy Latten 5154a49b499SJoy Latten err = -ENAMETOOLONG; 51681c4c35eSHerbert Xu if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, 517464b93a3SHerbert Xu "ccm_base(%s,%s)", ctr->base.cra_driver_name, 518f15f05b0SArd Biesheuvel mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 5194a49b499SJoy Latten goto err_drop_ctr; 5204a49b499SJoy Latten 52181c4c35eSHerbert Xu memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME); 5224a49b499SJoy Latten 523464b93a3SHerbert Xu inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC; 524f15f05b0SArd Biesheuvel inst->alg.base.cra_priority = (mac->base.cra_priority + 525464b93a3SHerbert Xu ctr->base.cra_priority) / 2; 52681c4c35eSHerbert Xu inst->alg.base.cra_blocksize = 1; 527f15f05b0SArd Biesheuvel inst->alg.base.cra_alignmask = mac->base.cra_alignmask | 5285ba8e2a0SArd Biesheuvel ctr->base.cra_alignmask; 52981c4c35eSHerbert Xu inst->alg.ivsize = 16; 530464b93a3SHerbert Xu inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); 53181c4c35eSHerbert Xu inst->alg.maxauthsize = 16; 53281c4c35eSHerbert Xu inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx); 53381c4c35eSHerbert Xu inst->alg.init = crypto_ccm_init_tfm; 53481c4c35eSHerbert Xu inst->alg.exit = crypto_ccm_exit_tfm; 53581c4c35eSHerbert Xu inst->alg.setkey = crypto_ccm_setkey; 53681c4c35eSHerbert Xu inst->alg.setauthsize = crypto_ccm_setauthsize; 53781c4c35eSHerbert Xu inst->alg.encrypt = crypto_ccm_encrypt; 53881c4c35eSHerbert Xu inst->alg.decrypt = crypto_ccm_decrypt; 5394a49b499SJoy Latten 54081c4c35eSHerbert Xu inst->free = crypto_ccm_free; 54181c4c35eSHerbert Xu 54281c4c35eSHerbert Xu err = aead_register_instance(tmpl, inst); 54381c4c35eSHerbert Xu if (err) 54481c4c35eSHerbert Xu goto err_drop_ctr; 54581c4c35eSHerbert Xu 546f15f05b0SArd Biesheuvel out_put_mac: 547f15f05b0SArd Biesheuvel crypto_mod_put(mac_alg); 54881c4c35eSHerbert Xu return err; 5494a49b499SJoy Latten 5504a49b499SJoy Latten err_drop_ctr: 5514a49b499SJoy Latten crypto_drop_skcipher(&ictx->ctr); 552f15f05b0SArd Biesheuvel err_drop_mac: 553f15f05b0SArd Biesheuvel crypto_drop_ahash(&ictx->mac); 5544a49b499SJoy Latten err_free_inst: 5554a49b499SJoy Latten kfree(inst); 556f15f05b0SArd Biesheuvel goto out_put_mac; 5574a49b499SJoy Latten } 5584a49b499SJoy Latten 55981c4c35eSHerbert Xu static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb) 5604a49b499SJoy Latten { 5614a49b499SJoy Latten const char *cipher_name; 5624a49b499SJoy Latten char ctr_name[CRYPTO_MAX_ALG_NAME]; 563f15f05b0SArd Biesheuvel char mac_name[CRYPTO_MAX_ALG_NAME]; 5644a49b499SJoy Latten char full_name[CRYPTO_MAX_ALG_NAME]; 5654a49b499SJoy Latten 5664a49b499SJoy Latten cipher_name = crypto_attr_alg_name(tb[1]); 5674a49b499SJoy Latten if (IS_ERR(cipher_name)) 56881c4c35eSHerbert Xu return PTR_ERR(cipher_name); 5694a49b499SJoy Latten 5704a49b499SJoy Latten if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", 5714a49b499SJoy Latten cipher_name) >= CRYPTO_MAX_ALG_NAME) 57281c4c35eSHerbert Xu return -ENAMETOOLONG; 5734a49b499SJoy Latten 574f15f05b0SArd Biesheuvel if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)", 575f15f05b0SArd Biesheuvel cipher_name) >= CRYPTO_MAX_ALG_NAME) 576f15f05b0SArd Biesheuvel return -ENAMETOOLONG; 577f15f05b0SArd Biesheuvel 5784a49b499SJoy Latten if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >= 5794a49b499SJoy Latten CRYPTO_MAX_ALG_NAME) 58081c4c35eSHerbert Xu return -ENAMETOOLONG; 5814a49b499SJoy Latten 58281c4c35eSHerbert Xu return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name, 583f15f05b0SArd Biesheuvel mac_name); 5844a49b499SJoy Latten } 5854a49b499SJoy Latten 5864a49b499SJoy Latten static struct crypto_template crypto_ccm_tmpl = { 5874a49b499SJoy Latten .name = "ccm", 58881c4c35eSHerbert Xu .create = crypto_ccm_create, 5894a49b499SJoy Latten .module = THIS_MODULE, 5904a49b499SJoy Latten }; 5914a49b499SJoy Latten 59281c4c35eSHerbert Xu static int crypto_ccm_base_create(struct crypto_template *tmpl, 59381c4c35eSHerbert Xu struct rtattr **tb) 5944a49b499SJoy Latten { 5954a49b499SJoy Latten const char *ctr_name; 5964a49b499SJoy Latten const char *cipher_name; 5974a49b499SJoy Latten char full_name[CRYPTO_MAX_ALG_NAME]; 5984a49b499SJoy Latten 5994a49b499SJoy Latten ctr_name = crypto_attr_alg_name(tb[1]); 6004a49b499SJoy Latten if (IS_ERR(ctr_name)) 60181c4c35eSHerbert Xu return PTR_ERR(ctr_name); 6024a49b499SJoy Latten 6034a49b499SJoy Latten cipher_name = crypto_attr_alg_name(tb[2]); 6044a49b499SJoy Latten if (IS_ERR(cipher_name)) 60581c4c35eSHerbert Xu return PTR_ERR(cipher_name); 6064a49b499SJoy Latten 6074a49b499SJoy Latten if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)", 6084a49b499SJoy Latten ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME) 60981c4c35eSHerbert Xu return -ENAMETOOLONG; 6104a49b499SJoy Latten 61181c4c35eSHerbert Xu return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name, 61281c4c35eSHerbert Xu cipher_name); 6134a49b499SJoy Latten } 6144a49b499SJoy Latten 6154a49b499SJoy Latten static struct crypto_template crypto_ccm_base_tmpl = { 6164a49b499SJoy Latten .name = "ccm_base", 61781c4c35eSHerbert Xu .create = crypto_ccm_base_create, 6184a49b499SJoy Latten .module = THIS_MODULE, 6194a49b499SJoy Latten }; 6204a49b499SJoy Latten 6214a49b499SJoy Latten static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key, 6224a49b499SJoy Latten unsigned int keylen) 6234a49b499SJoy Latten { 6244a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); 6254a49b499SJoy Latten struct crypto_aead *child = ctx->child; 6264a49b499SJoy Latten int err; 6274a49b499SJoy Latten 6284a49b499SJoy Latten if (keylen < 3) 6294a49b499SJoy Latten return -EINVAL; 6304a49b499SJoy Latten 6314a49b499SJoy Latten keylen -= 3; 6324a49b499SJoy Latten memcpy(ctx->nonce, key + keylen, 3); 6334a49b499SJoy Latten 6344a49b499SJoy Latten crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); 6354a49b499SJoy Latten crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & 6364a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 6374a49b499SJoy Latten err = crypto_aead_setkey(child, key, keylen); 6384a49b499SJoy Latten crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & 6394a49b499SJoy Latten CRYPTO_TFM_RES_MASK); 6404a49b499SJoy Latten 6414a49b499SJoy Latten return err; 6424a49b499SJoy Latten } 6434a49b499SJoy Latten 6444a49b499SJoy Latten static int crypto_rfc4309_setauthsize(struct crypto_aead *parent, 6454a49b499SJoy Latten unsigned int authsize) 6464a49b499SJoy Latten { 6474a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); 6484a49b499SJoy Latten 6494a49b499SJoy Latten switch (authsize) { 6504a49b499SJoy Latten case 8: 6514a49b499SJoy Latten case 12: 6524a49b499SJoy Latten case 16: 6534a49b499SJoy Latten break; 6544a49b499SJoy Latten default: 6554a49b499SJoy Latten return -EINVAL; 6564a49b499SJoy Latten } 6574a49b499SJoy Latten 6584a49b499SJoy Latten return crypto_aead_setauthsize(ctx->child, authsize); 6594a49b499SJoy Latten } 6604a49b499SJoy Latten 6614a49b499SJoy Latten static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req) 6624a49b499SJoy Latten { 66381c4c35eSHerbert Xu struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req); 66481c4c35eSHerbert Xu struct aead_request *subreq = &rctx->subreq; 6654a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 6664a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead); 6674a49b499SJoy Latten struct crypto_aead *child = ctx->child; 66881c4c35eSHerbert Xu struct scatterlist *sg; 6694a49b499SJoy Latten u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), 6704a49b499SJoy Latten crypto_aead_alignmask(child) + 1); 6714a49b499SJoy Latten 6724a49b499SJoy Latten /* L' */ 6734a49b499SJoy Latten iv[0] = 3; 6744a49b499SJoy Latten 6754a49b499SJoy Latten memcpy(iv + 1, ctx->nonce, 3); 6764a49b499SJoy Latten memcpy(iv + 4, req->iv, 8); 6774a49b499SJoy Latten 67881c4c35eSHerbert Xu scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0); 67981c4c35eSHerbert Xu 68081c4c35eSHerbert Xu sg_init_table(rctx->src, 3); 68181c4c35eSHerbert Xu sg_set_buf(rctx->src, iv + 16, req->assoclen - 8); 68281c4c35eSHerbert Xu sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); 68381c4c35eSHerbert Xu if (sg != rctx->src + 1) 68481c4c35eSHerbert Xu sg_chain(rctx->src, 2, sg); 68581c4c35eSHerbert Xu 68681c4c35eSHerbert Xu if (req->src != req->dst) { 68781c4c35eSHerbert Xu sg_init_table(rctx->dst, 3); 68881c4c35eSHerbert Xu sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8); 68981c4c35eSHerbert Xu sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); 69081c4c35eSHerbert Xu if (sg != rctx->dst + 1) 69181c4c35eSHerbert Xu sg_chain(rctx->dst, 2, sg); 69281c4c35eSHerbert Xu } 69381c4c35eSHerbert Xu 6944a49b499SJoy Latten aead_request_set_tfm(subreq, child); 6954a49b499SJoy Latten aead_request_set_callback(subreq, req->base.flags, req->base.complete, 6964a49b499SJoy Latten req->base.data); 69781c4c35eSHerbert Xu aead_request_set_crypt(subreq, rctx->src, 69881c4c35eSHerbert Xu req->src == req->dst ? rctx->src : rctx->dst, 69981c4c35eSHerbert Xu req->cryptlen, iv); 70081c4c35eSHerbert Xu aead_request_set_ad(subreq, req->assoclen - 8); 7014a49b499SJoy Latten 7024a49b499SJoy Latten return subreq; 7034a49b499SJoy Latten } 7044a49b499SJoy Latten 7054a49b499SJoy Latten static int crypto_rfc4309_encrypt(struct aead_request *req) 7064a49b499SJoy Latten { 70781c4c35eSHerbert Xu if (req->assoclen != 16 && req->assoclen != 20) 70881c4c35eSHerbert Xu return -EINVAL; 70981c4c35eSHerbert Xu 7104a49b499SJoy Latten req = crypto_rfc4309_crypt(req); 7114a49b499SJoy Latten 7124a49b499SJoy Latten return crypto_aead_encrypt(req); 7134a49b499SJoy Latten } 7144a49b499SJoy Latten 7154a49b499SJoy Latten static int crypto_rfc4309_decrypt(struct aead_request *req) 7164a49b499SJoy Latten { 71781c4c35eSHerbert Xu if (req->assoclen != 16 && req->assoclen != 20) 71881c4c35eSHerbert Xu return -EINVAL; 71981c4c35eSHerbert Xu 7204a49b499SJoy Latten req = crypto_rfc4309_crypt(req); 7214a49b499SJoy Latten 7224a49b499SJoy Latten return crypto_aead_decrypt(req); 7234a49b499SJoy Latten } 7244a49b499SJoy Latten 72581c4c35eSHerbert Xu static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm) 7264a49b499SJoy Latten { 72781c4c35eSHerbert Xu struct aead_instance *inst = aead_alg_instance(tfm); 72881c4c35eSHerbert Xu struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); 72981c4c35eSHerbert Xu struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); 7304a49b499SJoy Latten struct crypto_aead *aead; 7314a49b499SJoy Latten unsigned long align; 7324a49b499SJoy Latten 7334a49b499SJoy Latten aead = crypto_spawn_aead(spawn); 7344a49b499SJoy Latten if (IS_ERR(aead)) 7354a49b499SJoy Latten return PTR_ERR(aead); 7364a49b499SJoy Latten 7374a49b499SJoy Latten ctx->child = aead; 7384a49b499SJoy Latten 7394a49b499SJoy Latten align = crypto_aead_alignmask(aead); 7404a49b499SJoy Latten align &= ~(crypto_tfm_ctx_alignment() - 1); 74181c4c35eSHerbert Xu crypto_aead_set_reqsize( 74281c4c35eSHerbert Xu tfm, 74381c4c35eSHerbert Xu sizeof(struct crypto_rfc4309_req_ctx) + 7442c221ad3SHerbert Xu ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + 74581c4c35eSHerbert Xu align + 32); 7464a49b499SJoy Latten 7474a49b499SJoy Latten return 0; 7484a49b499SJoy Latten } 7494a49b499SJoy Latten 75081c4c35eSHerbert Xu static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm) 7514a49b499SJoy Latten { 75281c4c35eSHerbert Xu struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); 7534a49b499SJoy Latten 7544a49b499SJoy Latten crypto_free_aead(ctx->child); 7554a49b499SJoy Latten } 7564a49b499SJoy Latten 75781c4c35eSHerbert Xu static void crypto_rfc4309_free(struct aead_instance *inst) 75881c4c35eSHerbert Xu { 75981c4c35eSHerbert Xu crypto_drop_aead(aead_instance_ctx(inst)); 76081c4c35eSHerbert Xu kfree(inst); 76181c4c35eSHerbert Xu } 76281c4c35eSHerbert Xu 76381c4c35eSHerbert Xu static int crypto_rfc4309_create(struct crypto_template *tmpl, 76481c4c35eSHerbert Xu struct rtattr **tb) 7654a49b499SJoy Latten { 7664a49b499SJoy Latten struct crypto_attr_type *algt; 76781c4c35eSHerbert Xu struct aead_instance *inst; 7684a49b499SJoy Latten struct crypto_aead_spawn *spawn; 76981c4c35eSHerbert Xu struct aead_alg *alg; 7704a49b499SJoy Latten const char *ccm_name; 7714a49b499SJoy Latten int err; 7724a49b499SJoy Latten 7734a49b499SJoy Latten algt = crypto_get_attr_type(tb); 7744a49b499SJoy Latten if (IS_ERR(algt)) 77581c4c35eSHerbert Xu return PTR_ERR(algt); 7764a49b499SJoy Latten 7775e4b8c1fSHerbert Xu if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 77881c4c35eSHerbert Xu return -EINVAL; 7794a49b499SJoy Latten 7804a49b499SJoy Latten ccm_name = crypto_attr_alg_name(tb[1]); 7814a49b499SJoy Latten if (IS_ERR(ccm_name)) 78281c4c35eSHerbert Xu return PTR_ERR(ccm_name); 7834a49b499SJoy Latten 7844a49b499SJoy Latten inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 7854a49b499SJoy Latten if (!inst) 78681c4c35eSHerbert Xu return -ENOMEM; 7874a49b499SJoy Latten 78881c4c35eSHerbert Xu spawn = aead_instance_ctx(inst); 78981c4c35eSHerbert Xu crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); 7904a49b499SJoy Latten err = crypto_grab_aead(spawn, ccm_name, 0, 7914a49b499SJoy Latten crypto_requires_sync(algt->type, algt->mask)); 7924a49b499SJoy Latten if (err) 7934a49b499SJoy Latten goto out_free_inst; 7944a49b499SJoy Latten 79581c4c35eSHerbert Xu alg = crypto_spawn_aead_alg(spawn); 7964a49b499SJoy Latten 7974a49b499SJoy Latten err = -EINVAL; 7984a49b499SJoy Latten 7994a49b499SJoy Latten /* We only support 16-byte blocks. */ 80081c4c35eSHerbert Xu if (crypto_aead_alg_ivsize(alg) != 16) 8014a49b499SJoy Latten goto out_drop_alg; 8024a49b499SJoy Latten 8034a49b499SJoy Latten /* Not a stream cipher? */ 80481c4c35eSHerbert Xu if (alg->base.cra_blocksize != 1) 8054a49b499SJoy Latten goto out_drop_alg; 8064a49b499SJoy Latten 8074a49b499SJoy Latten err = -ENAMETOOLONG; 80881c4c35eSHerbert Xu if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 80981c4c35eSHerbert Xu "rfc4309(%s)", alg->base.cra_name) >= 81081c4c35eSHerbert Xu CRYPTO_MAX_ALG_NAME || 81181c4c35eSHerbert Xu snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, 81281c4c35eSHerbert Xu "rfc4309(%s)", alg->base.cra_driver_name) >= 8134a49b499SJoy Latten CRYPTO_MAX_ALG_NAME) 8144a49b499SJoy Latten goto out_drop_alg; 8154a49b499SJoy Latten 81681c4c35eSHerbert Xu inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; 81781c4c35eSHerbert Xu inst->alg.base.cra_priority = alg->base.cra_priority; 81881c4c35eSHerbert Xu inst->alg.base.cra_blocksize = 1; 81981c4c35eSHerbert Xu inst->alg.base.cra_alignmask = alg->base.cra_alignmask; 8204a49b499SJoy Latten 82181c4c35eSHerbert Xu inst->alg.ivsize = 8; 822464b93a3SHerbert Xu inst->alg.chunksize = crypto_aead_alg_chunksize(alg); 82381c4c35eSHerbert Xu inst->alg.maxauthsize = 16; 8244a49b499SJoy Latten 82581c4c35eSHerbert Xu inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); 8264a49b499SJoy Latten 82781c4c35eSHerbert Xu inst->alg.init = crypto_rfc4309_init_tfm; 82881c4c35eSHerbert Xu inst->alg.exit = crypto_rfc4309_exit_tfm; 8294a49b499SJoy Latten 83081c4c35eSHerbert Xu inst->alg.setkey = crypto_rfc4309_setkey; 83181c4c35eSHerbert Xu inst->alg.setauthsize = crypto_rfc4309_setauthsize; 83281c4c35eSHerbert Xu inst->alg.encrypt = crypto_rfc4309_encrypt; 83381c4c35eSHerbert Xu inst->alg.decrypt = crypto_rfc4309_decrypt; 8344a49b499SJoy Latten 83581c4c35eSHerbert Xu inst->free = crypto_rfc4309_free; 83681c4c35eSHerbert Xu 83781c4c35eSHerbert Xu err = aead_register_instance(tmpl, inst); 83881c4c35eSHerbert Xu if (err) 83981c4c35eSHerbert Xu goto out_drop_alg; 8404a49b499SJoy Latten 8414a49b499SJoy Latten out: 84281c4c35eSHerbert Xu return err; 8434a49b499SJoy Latten 8444a49b499SJoy Latten out_drop_alg: 8454a49b499SJoy Latten crypto_drop_aead(spawn); 8464a49b499SJoy Latten out_free_inst: 8474a49b499SJoy Latten kfree(inst); 8484a49b499SJoy Latten goto out; 8494a49b499SJoy Latten } 8504a49b499SJoy Latten 8514a49b499SJoy Latten static struct crypto_template crypto_rfc4309_tmpl = { 8524a49b499SJoy Latten .name = "rfc4309", 85381c4c35eSHerbert Xu .create = crypto_rfc4309_create, 8544a49b499SJoy Latten .module = THIS_MODULE, 8554a49b499SJoy Latten }; 8564a49b499SJoy Latten 857f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent, 858f15f05b0SArd Biesheuvel const u8 *inkey, unsigned int keylen) 859f15f05b0SArd Biesheuvel { 860f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent); 861f15f05b0SArd Biesheuvel 862f15f05b0SArd Biesheuvel return crypto_cipher_setkey(ctx->child, inkey, keylen); 863f15f05b0SArd Biesheuvel } 864f15f05b0SArd Biesheuvel 865f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_init(struct shash_desc *pdesc) 866f15f05b0SArd Biesheuvel { 867f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 868f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(pdesc->tfm); 8695338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs; 870f15f05b0SArd Biesheuvel 871f15f05b0SArd Biesheuvel ctx->len = 0; 8725338ad70SArd Biesheuvel memset(dg, 0, bs); 873f15f05b0SArd Biesheuvel 874f15f05b0SArd Biesheuvel return 0; 875f15f05b0SArd Biesheuvel } 876f15f05b0SArd Biesheuvel 877f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p, 878f15f05b0SArd Biesheuvel unsigned int len) 879f15f05b0SArd Biesheuvel { 880f15f05b0SArd Biesheuvel struct crypto_shash *parent = pdesc->tfm; 881f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); 882f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 883f15f05b0SArd Biesheuvel struct crypto_cipher *tfm = tctx->child; 884f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(parent); 8855338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; 886f15f05b0SArd Biesheuvel 887f15f05b0SArd Biesheuvel while (len > 0) { 888f15f05b0SArd Biesheuvel unsigned int l = min(len, bs - ctx->len); 889f15f05b0SArd Biesheuvel 8905338ad70SArd Biesheuvel crypto_xor(dg + ctx->len, p, l); 891f15f05b0SArd Biesheuvel ctx->len +=l; 892f15f05b0SArd Biesheuvel len -= l; 893f15f05b0SArd Biesheuvel p += l; 894f15f05b0SArd Biesheuvel 895f15f05b0SArd Biesheuvel if (ctx->len == bs) { 8965338ad70SArd Biesheuvel crypto_cipher_encrypt_one(tfm, dg, dg); 897f15f05b0SArd Biesheuvel ctx->len = 0; 898f15f05b0SArd Biesheuvel } 899f15f05b0SArd Biesheuvel } 900f15f05b0SArd Biesheuvel 901f15f05b0SArd Biesheuvel return 0; 902f15f05b0SArd Biesheuvel } 903f15f05b0SArd Biesheuvel 904f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out) 905f15f05b0SArd Biesheuvel { 906f15f05b0SArd Biesheuvel struct crypto_shash *parent = pdesc->tfm; 907f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); 908f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 909f15f05b0SArd Biesheuvel struct crypto_cipher *tfm = tctx->child; 910f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(parent); 9115338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; 912f15f05b0SArd Biesheuvel 913f15f05b0SArd Biesheuvel if (ctx->len) 9145338ad70SArd Biesheuvel crypto_cipher_encrypt_one(tfm, dg, dg); 915f15f05b0SArd Biesheuvel 9165338ad70SArd Biesheuvel memcpy(out, dg, bs); 917f15f05b0SArd Biesheuvel return 0; 918f15f05b0SArd Biesheuvel } 919f15f05b0SArd Biesheuvel 920f15f05b0SArd Biesheuvel static int cbcmac_init_tfm(struct crypto_tfm *tfm) 921f15f05b0SArd Biesheuvel { 922f15f05b0SArd Biesheuvel struct crypto_cipher *cipher; 923f15f05b0SArd Biesheuvel struct crypto_instance *inst = (void *)tfm->__crt_alg; 924f15f05b0SArd Biesheuvel struct crypto_spawn *spawn = crypto_instance_ctx(inst); 925f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 926f15f05b0SArd Biesheuvel 927f15f05b0SArd Biesheuvel cipher = crypto_spawn_cipher(spawn); 928f15f05b0SArd Biesheuvel if (IS_ERR(cipher)) 929f15f05b0SArd Biesheuvel return PTR_ERR(cipher); 930f15f05b0SArd Biesheuvel 931f15f05b0SArd Biesheuvel ctx->child = cipher; 932f15f05b0SArd Biesheuvel 933f15f05b0SArd Biesheuvel return 0; 934f15f05b0SArd Biesheuvel }; 935f15f05b0SArd Biesheuvel 936f15f05b0SArd Biesheuvel static void cbcmac_exit_tfm(struct crypto_tfm *tfm) 937f15f05b0SArd Biesheuvel { 938f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 939f15f05b0SArd Biesheuvel crypto_free_cipher(ctx->child); 940f15f05b0SArd Biesheuvel } 941f15f05b0SArd Biesheuvel 942f15f05b0SArd Biesheuvel static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb) 943f15f05b0SArd Biesheuvel { 944f15f05b0SArd Biesheuvel struct shash_instance *inst; 945f15f05b0SArd Biesheuvel struct crypto_alg *alg; 946f15f05b0SArd Biesheuvel int err; 947f15f05b0SArd Biesheuvel 948f15f05b0SArd Biesheuvel err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); 949f15f05b0SArd Biesheuvel if (err) 950f15f05b0SArd Biesheuvel return err; 951f15f05b0SArd Biesheuvel 952f15f05b0SArd Biesheuvel alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, 953f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_MASK); 954f15f05b0SArd Biesheuvel if (IS_ERR(alg)) 955f15f05b0SArd Biesheuvel return PTR_ERR(alg); 956f15f05b0SArd Biesheuvel 957f15f05b0SArd Biesheuvel inst = shash_alloc_instance("cbcmac", alg); 958f15f05b0SArd Biesheuvel err = PTR_ERR(inst); 959f15f05b0SArd Biesheuvel if (IS_ERR(inst)) 960f15f05b0SArd Biesheuvel goto out_put_alg; 961f15f05b0SArd Biesheuvel 962f15f05b0SArd Biesheuvel err = crypto_init_spawn(shash_instance_ctx(inst), alg, 963f15f05b0SArd Biesheuvel shash_crypto_instance(inst), 964f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_MASK); 965f15f05b0SArd Biesheuvel if (err) 966f15f05b0SArd Biesheuvel goto out_free_inst; 967f15f05b0SArd Biesheuvel 968f15f05b0SArd Biesheuvel inst->alg.base.cra_priority = alg->cra_priority; 969f15f05b0SArd Biesheuvel inst->alg.base.cra_blocksize = 1; 970f15f05b0SArd Biesheuvel 971f15f05b0SArd Biesheuvel inst->alg.digestsize = alg->cra_blocksize; 9725338ad70SArd Biesheuvel inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx), 9735338ad70SArd Biesheuvel alg->cra_alignmask + 1) + 974f15f05b0SArd Biesheuvel alg->cra_blocksize; 975f15f05b0SArd Biesheuvel 976f15f05b0SArd Biesheuvel inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx); 977f15f05b0SArd Biesheuvel inst->alg.base.cra_init = cbcmac_init_tfm; 978f15f05b0SArd Biesheuvel inst->alg.base.cra_exit = cbcmac_exit_tfm; 979f15f05b0SArd Biesheuvel 980f15f05b0SArd Biesheuvel inst->alg.init = crypto_cbcmac_digest_init; 981f15f05b0SArd Biesheuvel inst->alg.update = crypto_cbcmac_digest_update; 982f15f05b0SArd Biesheuvel inst->alg.final = crypto_cbcmac_digest_final; 983f15f05b0SArd Biesheuvel inst->alg.setkey = crypto_cbcmac_digest_setkey; 984f15f05b0SArd Biesheuvel 985f15f05b0SArd Biesheuvel err = shash_register_instance(tmpl, inst); 986f15f05b0SArd Biesheuvel 987f15f05b0SArd Biesheuvel out_free_inst: 988f15f05b0SArd Biesheuvel if (err) 989f15f05b0SArd Biesheuvel shash_free_instance(shash_crypto_instance(inst)); 990f15f05b0SArd Biesheuvel 991f15f05b0SArd Biesheuvel out_put_alg: 992f15f05b0SArd Biesheuvel crypto_mod_put(alg); 993f15f05b0SArd Biesheuvel return err; 994f15f05b0SArd Biesheuvel } 995f15f05b0SArd Biesheuvel 996f15f05b0SArd Biesheuvel static struct crypto_template crypto_cbcmac_tmpl = { 997f15f05b0SArd Biesheuvel .name = "cbcmac", 998f15f05b0SArd Biesheuvel .create = cbcmac_create, 999f15f05b0SArd Biesheuvel .free = shash_free_instance, 1000f15f05b0SArd Biesheuvel .module = THIS_MODULE, 1001f15f05b0SArd Biesheuvel }; 1002f15f05b0SArd Biesheuvel 10034a49b499SJoy Latten static int __init crypto_ccm_module_init(void) 10044a49b499SJoy Latten { 10054a49b499SJoy Latten int err; 10064a49b499SJoy Latten 1007f15f05b0SArd Biesheuvel err = crypto_register_template(&crypto_cbcmac_tmpl); 10084a49b499SJoy Latten if (err) 10094a49b499SJoy Latten goto out; 10104a49b499SJoy Latten 1011f15f05b0SArd Biesheuvel err = crypto_register_template(&crypto_ccm_base_tmpl); 1012f15f05b0SArd Biesheuvel if (err) 1013f15f05b0SArd Biesheuvel goto out_undo_cbcmac; 1014f15f05b0SArd Biesheuvel 10154a49b499SJoy Latten err = crypto_register_template(&crypto_ccm_tmpl); 10164a49b499SJoy Latten if (err) 10174a49b499SJoy Latten goto out_undo_base; 10184a49b499SJoy Latten 10194a49b499SJoy Latten err = crypto_register_template(&crypto_rfc4309_tmpl); 10204a49b499SJoy Latten if (err) 10214a49b499SJoy Latten goto out_undo_ccm; 10224a49b499SJoy Latten 10234a49b499SJoy Latten out: 10244a49b499SJoy Latten return err; 10254a49b499SJoy Latten 10264a49b499SJoy Latten out_undo_ccm: 10274a49b499SJoy Latten crypto_unregister_template(&crypto_ccm_tmpl); 10284a49b499SJoy Latten out_undo_base: 10294a49b499SJoy Latten crypto_unregister_template(&crypto_ccm_base_tmpl); 1030f15f05b0SArd Biesheuvel out_undo_cbcmac: 1031f15f05b0SArd Biesheuvel crypto_register_template(&crypto_cbcmac_tmpl); 10324a49b499SJoy Latten goto out; 10334a49b499SJoy Latten } 10344a49b499SJoy Latten 10354a49b499SJoy Latten static void __exit crypto_ccm_module_exit(void) 10364a49b499SJoy Latten { 10374a49b499SJoy Latten crypto_unregister_template(&crypto_rfc4309_tmpl); 10384a49b499SJoy Latten crypto_unregister_template(&crypto_ccm_tmpl); 10394a49b499SJoy Latten crypto_unregister_template(&crypto_ccm_base_tmpl); 1040f15f05b0SArd Biesheuvel crypto_unregister_template(&crypto_cbcmac_tmpl); 10414a49b499SJoy Latten } 10424a49b499SJoy Latten 10434a49b499SJoy Latten module_init(crypto_ccm_module_init); 10444a49b499SJoy Latten module_exit(crypto_ccm_module_exit); 10454a49b499SJoy Latten 10464a49b499SJoy Latten MODULE_LICENSE("GPL"); 10474a49b499SJoy Latten MODULE_DESCRIPTION("Counter with CBC MAC"); 10485d26a105SKees Cook MODULE_ALIAS_CRYPTO("ccm_base"); 10495d26a105SKees Cook MODULE_ALIAS_CRYPTO("rfc4309"); 10504943ba16SKees Cook MODULE_ALIAS_CRYPTO("ccm"); 1051