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]; 483b30460cSArd Biesheuvel u8 idata[16]; 494a49b499SJoy Latten u8 auth_tag[16]; 504a49b499SJoy Latten u32 flags; 5181c4c35eSHerbert Xu struct scatterlist src[3]; 5281c4c35eSHerbert Xu struct scatterlist dst[3]; 53ebf533adSArd Biesheuvel union { 54ebf533adSArd Biesheuvel struct ahash_request ahreq; 55464b93a3SHerbert Xu struct skcipher_request skreq; 564a49b499SJoy Latten }; 57ebf533adSArd Biesheuvel }; 584a49b499SJoy Latten 59f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx { 60f15f05b0SArd Biesheuvel struct crypto_cipher *child; 61f15f05b0SArd Biesheuvel }; 62f15f05b0SArd Biesheuvel 63f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx { 64f15f05b0SArd Biesheuvel unsigned int len; 65f15f05b0SArd Biesheuvel }; 66f15f05b0SArd Biesheuvel 674a49b499SJoy Latten static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx( 684a49b499SJoy Latten struct aead_request *req) 694a49b499SJoy Latten { 704a49b499SJoy Latten unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); 714a49b499SJoy Latten 724a49b499SJoy Latten return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); 734a49b499SJoy Latten } 744a49b499SJoy Latten 754a49b499SJoy Latten static int set_msg_len(u8 *block, unsigned int msglen, int csize) 764a49b499SJoy Latten { 774a49b499SJoy Latten __be32 data; 784a49b499SJoy Latten 794a49b499SJoy Latten memset(block, 0, csize); 804a49b499SJoy Latten block += csize; 814a49b499SJoy Latten 824a49b499SJoy Latten if (csize >= 4) 834a49b499SJoy Latten csize = 4; 844a49b499SJoy Latten else if (msglen > (1 << (8 * csize))) 854a49b499SJoy Latten return -EOVERFLOW; 864a49b499SJoy Latten 874a49b499SJoy Latten data = cpu_to_be32(msglen); 884a49b499SJoy Latten memcpy(block - csize, (u8 *)&data + 4 - csize, csize); 894a49b499SJoy Latten 904a49b499SJoy Latten return 0; 914a49b499SJoy Latten } 924a49b499SJoy Latten 934a49b499SJoy Latten static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key, 944a49b499SJoy Latten unsigned int keylen) 954a49b499SJoy Latten { 964a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 97464b93a3SHerbert Xu struct crypto_skcipher *ctr = ctx->ctr; 98f15f05b0SArd Biesheuvel struct crypto_ahash *mac = ctx->mac; 994a49b499SJoy Latten int err = 0; 1004a49b499SJoy Latten 101464b93a3SHerbert Xu crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); 102464b93a3SHerbert Xu crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & 1034a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 104464b93a3SHerbert Xu err = crypto_skcipher_setkey(ctr, key, keylen); 105464b93a3SHerbert Xu crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) & 1064a49b499SJoy Latten CRYPTO_TFM_RES_MASK); 1074a49b499SJoy Latten if (err) 1084a49b499SJoy Latten goto out; 1094a49b499SJoy Latten 110f15f05b0SArd Biesheuvel crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK); 111f15f05b0SArd Biesheuvel crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) & 1124a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 113f15f05b0SArd Biesheuvel err = crypto_ahash_setkey(mac, key, keylen); 114f15f05b0SArd Biesheuvel crypto_aead_set_flags(aead, crypto_ahash_get_flags(mac) & 1154a49b499SJoy Latten CRYPTO_TFM_RES_MASK); 1164a49b499SJoy Latten 1174a49b499SJoy Latten out: 1184a49b499SJoy Latten return err; 1194a49b499SJoy Latten } 1204a49b499SJoy Latten 1214a49b499SJoy Latten static int crypto_ccm_setauthsize(struct crypto_aead *tfm, 1224a49b499SJoy Latten unsigned int authsize) 1234a49b499SJoy Latten { 1244a49b499SJoy Latten switch (authsize) { 1254a49b499SJoy Latten case 4: 1264a49b499SJoy Latten case 6: 1274a49b499SJoy Latten case 8: 1284a49b499SJoy Latten case 10: 1294a49b499SJoy Latten case 12: 1304a49b499SJoy Latten case 14: 1314a49b499SJoy Latten case 16: 1324a49b499SJoy Latten break; 1334a49b499SJoy Latten default: 1344a49b499SJoy Latten return -EINVAL; 1354a49b499SJoy Latten } 1364a49b499SJoy Latten 1374a49b499SJoy Latten return 0; 1384a49b499SJoy Latten } 1394a49b499SJoy Latten 1404a49b499SJoy Latten static int format_input(u8 *info, struct aead_request *req, 1414a49b499SJoy Latten unsigned int cryptlen) 1424a49b499SJoy Latten { 1434a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 1444a49b499SJoy Latten unsigned int lp = req->iv[0]; 1454a49b499SJoy Latten unsigned int l = lp + 1; 1464a49b499SJoy Latten unsigned int m; 1474a49b499SJoy Latten 1484a49b499SJoy Latten m = crypto_aead_authsize(aead); 1494a49b499SJoy Latten 1504a49b499SJoy Latten memcpy(info, req->iv, 16); 1514a49b499SJoy Latten 1524a49b499SJoy Latten /* format control info per RFC 3610 and 1534a49b499SJoy Latten * NIST Special Publication 800-38C 1544a49b499SJoy Latten */ 1554a49b499SJoy Latten *info |= (8 * ((m - 2) / 2)); 1564a49b499SJoy Latten if (req->assoclen) 1574a49b499SJoy Latten *info |= 64; 1584a49b499SJoy Latten 1594a49b499SJoy Latten return set_msg_len(info + 16 - l, cryptlen, l); 1604a49b499SJoy Latten } 1614a49b499SJoy Latten 1624a49b499SJoy Latten static int format_adata(u8 *adata, unsigned int a) 1634a49b499SJoy Latten { 1644a49b499SJoy Latten int len = 0; 1654a49b499SJoy Latten 1664a49b499SJoy Latten /* add control info for associated data 1674a49b499SJoy Latten * RFC 3610 and NIST Special Publication 800-38C 1684a49b499SJoy Latten */ 1694a49b499SJoy Latten if (a < 65280) { 1704a49b499SJoy Latten *(__be16 *)adata = cpu_to_be16(a); 1714a49b499SJoy Latten len = 2; 1724a49b499SJoy Latten } else { 1734a49b499SJoy Latten *(__be16 *)adata = cpu_to_be16(0xfffe); 1744a49b499SJoy Latten *(__be32 *)&adata[2] = cpu_to_be32(a); 1754a49b499SJoy Latten len = 6; 1764a49b499SJoy Latten } 1774a49b499SJoy Latten 1784a49b499SJoy Latten return len; 1794a49b499SJoy Latten } 1804a49b499SJoy Latten 1814a49b499SJoy Latten static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain, 1824a49b499SJoy Latten unsigned int cryptlen) 1834a49b499SJoy Latten { 184f15f05b0SArd Biesheuvel struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 1854a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 1864a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 187ebf533adSArd Biesheuvel struct ahash_request *ahreq = &pctx->ahreq; 1884a49b499SJoy Latten unsigned int assoclen = req->assoclen; 189f15f05b0SArd Biesheuvel struct scatterlist sg[3]; 1903b30460cSArd Biesheuvel u8 *odata = pctx->odata; 1913b30460cSArd Biesheuvel u8 *idata = pctx->idata; 192f15f05b0SArd Biesheuvel int ilen, err; 1934a49b499SJoy Latten 1944a49b499SJoy Latten /* format control data for input */ 1954a49b499SJoy Latten err = format_input(odata, req, cryptlen); 1964a49b499SJoy Latten if (err) 1974a49b499SJoy Latten goto out; 1984a49b499SJoy Latten 199f15f05b0SArd Biesheuvel sg_init_table(sg, 3); 200f15f05b0SArd Biesheuvel sg_set_buf(&sg[0], odata, 16); 2014a49b499SJoy Latten 2024a49b499SJoy Latten /* format associated data and compute into mac */ 2034a49b499SJoy Latten if (assoclen) { 204f15f05b0SArd Biesheuvel ilen = format_adata(idata, assoclen); 205f15f05b0SArd Biesheuvel sg_set_buf(&sg[1], idata, ilen); 206f15f05b0SArd Biesheuvel sg_chain(sg, 3, req->src); 207516280e7SJarod Wilson } else { 208f15f05b0SArd Biesheuvel ilen = 0; 209f15f05b0SArd Biesheuvel sg_chain(sg, 2, req->src); 2104a49b499SJoy Latten } 2114a49b499SJoy Latten 212f15f05b0SArd Biesheuvel ahash_request_set_tfm(ahreq, ctx->mac); 213f15f05b0SArd Biesheuvel ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL); 214f15f05b0SArd Biesheuvel ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16); 215f15f05b0SArd Biesheuvel err = crypto_ahash_init(ahreq); 216f15f05b0SArd Biesheuvel if (err) 217f15f05b0SArd Biesheuvel goto out; 218f15f05b0SArd Biesheuvel err = crypto_ahash_update(ahreq); 219f15f05b0SArd Biesheuvel if (err) 220f15f05b0SArd Biesheuvel goto out; 2214a49b499SJoy Latten 222f15f05b0SArd Biesheuvel /* we need to pad the MAC input to a round multiple of the block size */ 223f15f05b0SArd Biesheuvel ilen = 16 - (assoclen + ilen) % 16; 224f15f05b0SArd Biesheuvel if (ilen < 16) { 225f15f05b0SArd Biesheuvel memset(idata, 0, ilen); 226f15f05b0SArd Biesheuvel sg_init_table(sg, 2); 227f15f05b0SArd Biesheuvel sg_set_buf(&sg[0], idata, ilen); 228f15f05b0SArd Biesheuvel if (plain) 229f15f05b0SArd Biesheuvel sg_chain(sg, 2, plain); 230f15f05b0SArd Biesheuvel plain = sg; 231f15f05b0SArd Biesheuvel cryptlen += ilen; 232f15f05b0SArd Biesheuvel } 233f15f05b0SArd Biesheuvel 234f15f05b0SArd Biesheuvel ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen); 235f15f05b0SArd Biesheuvel err = crypto_ahash_finup(ahreq); 2364a49b499SJoy Latten out: 2374a49b499SJoy Latten return err; 2384a49b499SJoy Latten } 2394a49b499SJoy Latten 2404a49b499SJoy Latten static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err) 2414a49b499SJoy Latten { 2424a49b499SJoy Latten struct aead_request *req = areq->data; 2434a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 2444a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 2454a49b499SJoy Latten u8 *odata = pctx->odata; 2464a49b499SJoy Latten 2474a49b499SJoy Latten if (!err) 24881c4c35eSHerbert Xu scatterwalk_map_and_copy(odata, req->dst, 24981c4c35eSHerbert Xu req->assoclen + req->cryptlen, 2504a49b499SJoy Latten crypto_aead_authsize(aead), 1); 2514a49b499SJoy Latten aead_request_complete(req, err); 2524a49b499SJoy Latten } 2534a49b499SJoy Latten 2544a49b499SJoy Latten static inline int crypto_ccm_check_iv(const u8 *iv) 2554a49b499SJoy Latten { 2564a49b499SJoy Latten /* 2 <= L <= 8, so 1 <= L' <= 7. */ 2574a49b499SJoy Latten if (1 > iv[0] || iv[0] > 7) 2584a49b499SJoy Latten return -EINVAL; 2594a49b499SJoy Latten 2604a49b499SJoy Latten return 0; 2614a49b499SJoy Latten } 2624a49b499SJoy Latten 26381c4c35eSHerbert Xu static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag) 26481c4c35eSHerbert Xu { 26581c4c35eSHerbert Xu struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 26681c4c35eSHerbert Xu struct scatterlist *sg; 26781c4c35eSHerbert Xu u8 *iv = req->iv; 26881c4c35eSHerbert Xu int err; 26981c4c35eSHerbert Xu 27081c4c35eSHerbert Xu err = crypto_ccm_check_iv(iv); 27181c4c35eSHerbert Xu if (err) 27281c4c35eSHerbert Xu return err; 27381c4c35eSHerbert Xu 27481c4c35eSHerbert Xu pctx->flags = aead_request_flags(req); 27581c4c35eSHerbert Xu 27681c4c35eSHerbert Xu /* Note: rfc 3610 and NIST 800-38C require counter of 27781c4c35eSHerbert Xu * zero to encrypt auth tag. 27881c4c35eSHerbert Xu */ 27981c4c35eSHerbert Xu memset(iv + 15 - iv[0], 0, iv[0] + 1); 28081c4c35eSHerbert Xu 28181c4c35eSHerbert Xu sg_init_table(pctx->src, 3); 28281c4c35eSHerbert Xu sg_set_buf(pctx->src, tag, 16); 28381c4c35eSHerbert Xu sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); 28481c4c35eSHerbert Xu if (sg != pctx->src + 1) 28581c4c35eSHerbert Xu sg_chain(pctx->src, 2, sg); 28681c4c35eSHerbert Xu 28781c4c35eSHerbert Xu if (req->src != req->dst) { 28881c4c35eSHerbert Xu sg_init_table(pctx->dst, 3); 28981c4c35eSHerbert Xu sg_set_buf(pctx->dst, tag, 16); 29081c4c35eSHerbert Xu sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); 29181c4c35eSHerbert Xu if (sg != pctx->dst + 1) 29281c4c35eSHerbert Xu sg_chain(pctx->dst, 2, sg); 29381c4c35eSHerbert Xu } 29481c4c35eSHerbert Xu 29581c4c35eSHerbert Xu return 0; 29681c4c35eSHerbert Xu } 29781c4c35eSHerbert Xu 2984a49b499SJoy Latten static int crypto_ccm_encrypt(struct aead_request *req) 2994a49b499SJoy Latten { 3004a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 3014a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 3024a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 303464b93a3SHerbert Xu struct skcipher_request *skreq = &pctx->skreq; 3044a49b499SJoy Latten struct scatterlist *dst; 3054a49b499SJoy Latten unsigned int cryptlen = req->cryptlen; 3064a49b499SJoy Latten u8 *odata = pctx->odata; 3074a49b499SJoy Latten u8 *iv = req->iv; 3084a49b499SJoy Latten int err; 3094a49b499SJoy Latten 31081c4c35eSHerbert Xu err = crypto_ccm_init_crypt(req, odata); 3114a49b499SJoy Latten if (err) 3124a49b499SJoy Latten return err; 3134a49b499SJoy Latten 31481c4c35eSHerbert Xu err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen); 3154a49b499SJoy Latten if (err) 3164a49b499SJoy Latten return err; 3174a49b499SJoy Latten 3184a49b499SJoy Latten dst = pctx->src; 31981c4c35eSHerbert Xu if (req->src != req->dst) 3204a49b499SJoy Latten dst = pctx->dst; 3214a49b499SJoy Latten 322464b93a3SHerbert Xu skcipher_request_set_tfm(skreq, ctx->ctr); 323464b93a3SHerbert Xu skcipher_request_set_callback(skreq, pctx->flags, 3244a49b499SJoy Latten crypto_ccm_encrypt_done, req); 325464b93a3SHerbert Xu skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); 326464b93a3SHerbert Xu err = crypto_skcipher_encrypt(skreq); 3274a49b499SJoy Latten if (err) 3284a49b499SJoy Latten return err; 3294a49b499SJoy Latten 3304a49b499SJoy Latten /* copy authtag to end of dst */ 33181c4c35eSHerbert Xu scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen, 3324a49b499SJoy Latten crypto_aead_authsize(aead), 1); 3334a49b499SJoy Latten return err; 3344a49b499SJoy Latten } 3354a49b499SJoy Latten 3364a49b499SJoy Latten static void crypto_ccm_decrypt_done(struct crypto_async_request *areq, 3374a49b499SJoy Latten int err) 3384a49b499SJoy Latten { 3394a49b499SJoy Latten struct aead_request *req = areq->data; 3404a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 3414a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 3424a49b499SJoy Latten unsigned int authsize = crypto_aead_authsize(aead); 3434a49b499SJoy Latten unsigned int cryptlen = req->cryptlen - authsize; 34481c4c35eSHerbert Xu struct scatterlist *dst; 34581c4c35eSHerbert Xu 34681c4c35eSHerbert Xu pctx->flags = 0; 34781c4c35eSHerbert Xu 34881c4c35eSHerbert Xu dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst); 3494a49b499SJoy Latten 3504a49b499SJoy Latten if (!err) { 35181c4c35eSHerbert Xu err = crypto_ccm_auth(req, dst, cryptlen); 3526bf37e5aSJames Yonan if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize)) 3534a49b499SJoy Latten err = -EBADMSG; 3544a49b499SJoy Latten } 3554a49b499SJoy Latten aead_request_complete(req, err); 3564a49b499SJoy Latten } 3574a49b499SJoy Latten 3584a49b499SJoy Latten static int crypto_ccm_decrypt(struct aead_request *req) 3594a49b499SJoy Latten { 3604a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 3614a49b499SJoy Latten struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 3624a49b499SJoy Latten struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 363464b93a3SHerbert Xu struct skcipher_request *skreq = &pctx->skreq; 3644a49b499SJoy Latten struct scatterlist *dst; 3654a49b499SJoy Latten unsigned int authsize = crypto_aead_authsize(aead); 3664a49b499SJoy Latten unsigned int cryptlen = req->cryptlen; 3674a49b499SJoy Latten u8 *authtag = pctx->auth_tag; 3684a49b499SJoy Latten u8 *odata = pctx->odata; 369441f99c9SRomain Izard u8 *iv = pctx->idata; 3704a49b499SJoy Latten int err; 3714a49b499SJoy Latten 3724a49b499SJoy Latten cryptlen -= authsize; 3734a49b499SJoy Latten 37481c4c35eSHerbert Xu err = crypto_ccm_init_crypt(req, authtag); 3754a49b499SJoy Latten if (err) 3764a49b499SJoy Latten return err; 3774a49b499SJoy Latten 37881c4c35eSHerbert Xu scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen, 37981c4c35eSHerbert Xu authsize, 0); 3804a49b499SJoy Latten 3814a49b499SJoy Latten dst = pctx->src; 38281c4c35eSHerbert Xu if (req->src != req->dst) 3834a49b499SJoy Latten dst = pctx->dst; 3844a49b499SJoy Latten 385441f99c9SRomain Izard memcpy(iv, req->iv, 16); 386441f99c9SRomain Izard 387464b93a3SHerbert Xu skcipher_request_set_tfm(skreq, ctx->ctr); 388464b93a3SHerbert Xu skcipher_request_set_callback(skreq, pctx->flags, 3894a49b499SJoy Latten crypto_ccm_decrypt_done, req); 390464b93a3SHerbert Xu skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); 391464b93a3SHerbert Xu err = crypto_skcipher_decrypt(skreq); 3924a49b499SJoy Latten if (err) 3934a49b499SJoy Latten return err; 3944a49b499SJoy Latten 39581c4c35eSHerbert Xu err = crypto_ccm_auth(req, sg_next(dst), cryptlen); 3964a49b499SJoy Latten if (err) 3974a49b499SJoy Latten return err; 3984a49b499SJoy Latten 3994a49b499SJoy Latten /* verify */ 4006bf37e5aSJames Yonan if (crypto_memneq(authtag, odata, authsize)) 4014a49b499SJoy Latten return -EBADMSG; 4024a49b499SJoy Latten 4034a49b499SJoy Latten return err; 4044a49b499SJoy Latten } 4054a49b499SJoy Latten 40681c4c35eSHerbert Xu static int crypto_ccm_init_tfm(struct crypto_aead *tfm) 4074a49b499SJoy Latten { 40881c4c35eSHerbert Xu struct aead_instance *inst = aead_alg_instance(tfm); 40981c4c35eSHerbert Xu struct ccm_instance_ctx *ictx = aead_instance_ctx(inst); 41081c4c35eSHerbert Xu struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); 411f15f05b0SArd Biesheuvel struct crypto_ahash *mac; 412464b93a3SHerbert Xu struct crypto_skcipher *ctr; 4134a49b499SJoy Latten unsigned long align; 4144a49b499SJoy Latten int err; 4154a49b499SJoy Latten 416f15f05b0SArd Biesheuvel mac = crypto_spawn_ahash(&ictx->mac); 417f15f05b0SArd Biesheuvel if (IS_ERR(mac)) 418f15f05b0SArd Biesheuvel return PTR_ERR(mac); 4194a49b499SJoy Latten 42060425a8bSEric Biggers ctr = crypto_spawn_skcipher(&ictx->ctr); 4214a49b499SJoy Latten err = PTR_ERR(ctr); 4224a49b499SJoy Latten if (IS_ERR(ctr)) 423f15f05b0SArd Biesheuvel goto err_free_mac; 4244a49b499SJoy Latten 425f15f05b0SArd Biesheuvel ctx->mac = mac; 4264a49b499SJoy Latten ctx->ctr = ctr; 4274a49b499SJoy Latten 42881c4c35eSHerbert Xu align = crypto_aead_alignmask(tfm); 4294a49b499SJoy Latten align &= ~(crypto_tfm_ctx_alignment() - 1); 43081c4c35eSHerbert Xu crypto_aead_set_reqsize( 43181c4c35eSHerbert Xu tfm, 4322c221ad3SHerbert Xu align + sizeof(struct crypto_ccm_req_priv_ctx) + 433ebf533adSArd Biesheuvel max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr))); 4344a49b499SJoy Latten 4354a49b499SJoy Latten return 0; 4364a49b499SJoy Latten 437f15f05b0SArd Biesheuvel err_free_mac: 438f15f05b0SArd Biesheuvel crypto_free_ahash(mac); 4394a49b499SJoy Latten return err; 4404a49b499SJoy Latten } 4414a49b499SJoy Latten 44281c4c35eSHerbert Xu static void crypto_ccm_exit_tfm(struct crypto_aead *tfm) 4434a49b499SJoy Latten { 44481c4c35eSHerbert Xu struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); 4454a49b499SJoy Latten 446f15f05b0SArd Biesheuvel crypto_free_ahash(ctx->mac); 447464b93a3SHerbert Xu crypto_free_skcipher(ctx->ctr); 4484a49b499SJoy Latten } 4494a49b499SJoy Latten 45081c4c35eSHerbert Xu static void crypto_ccm_free(struct aead_instance *inst) 45181c4c35eSHerbert Xu { 45281c4c35eSHerbert Xu struct ccm_instance_ctx *ctx = aead_instance_ctx(inst); 45381c4c35eSHerbert Xu 454f15f05b0SArd Biesheuvel crypto_drop_ahash(&ctx->mac); 45581c4c35eSHerbert Xu crypto_drop_skcipher(&ctx->ctr); 45681c4c35eSHerbert Xu kfree(inst); 45781c4c35eSHerbert Xu } 45881c4c35eSHerbert Xu 45981c4c35eSHerbert Xu static int crypto_ccm_create_common(struct crypto_template *tmpl, 46081c4c35eSHerbert Xu struct rtattr **tb, 4614a49b499SJoy Latten const char *full_name, 4624a49b499SJoy Latten const char *ctr_name, 463f15f05b0SArd Biesheuvel const char *mac_name) 4644a49b499SJoy Latten { 4654a49b499SJoy Latten struct crypto_attr_type *algt; 46681c4c35eSHerbert Xu struct aead_instance *inst; 467464b93a3SHerbert Xu struct skcipher_alg *ctr; 468f15f05b0SArd Biesheuvel struct crypto_alg *mac_alg; 469f15f05b0SArd Biesheuvel struct hash_alg_common *mac; 4704a49b499SJoy Latten struct ccm_instance_ctx *ictx; 4714a49b499SJoy Latten int err; 4724a49b499SJoy Latten 4734a49b499SJoy Latten algt = crypto_get_attr_type(tb); 4744a49b499SJoy Latten if (IS_ERR(algt)) 47581c4c35eSHerbert Xu return PTR_ERR(algt); 4764a49b499SJoy Latten 4775e4b8c1fSHerbert Xu if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 47881c4c35eSHerbert Xu return -EINVAL; 4794a49b499SJoy Latten 480f15f05b0SArd Biesheuvel mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type, 481f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_HASH, 482f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_AHASH_MASK | 483f15f05b0SArd Biesheuvel CRYPTO_ALG_ASYNC); 484f15f05b0SArd Biesheuvel if (IS_ERR(mac_alg)) 485f15f05b0SArd Biesheuvel return PTR_ERR(mac_alg); 4864a49b499SJoy Latten 487f15f05b0SArd Biesheuvel mac = __crypto_hash_alg_common(mac_alg); 4884a49b499SJoy Latten err = -EINVAL; 489f15f05b0SArd Biesheuvel if (mac->digestsize != 16) 490f15f05b0SArd Biesheuvel goto out_put_mac; 4914a49b499SJoy Latten 4924a49b499SJoy Latten inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); 4934a49b499SJoy Latten err = -ENOMEM; 4944a49b499SJoy Latten if (!inst) 495f15f05b0SArd Biesheuvel goto out_put_mac; 4964a49b499SJoy Latten 49781c4c35eSHerbert Xu ictx = aead_instance_ctx(inst); 498f15f05b0SArd Biesheuvel err = crypto_init_ahash_spawn(&ictx->mac, mac, 499f15f05b0SArd Biesheuvel aead_crypto_instance(inst)); 5004a49b499SJoy Latten if (err) 5014a49b499SJoy Latten goto err_free_inst; 5024a49b499SJoy Latten 50381c4c35eSHerbert Xu crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst)); 504a35528ecSEric Biggers err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0, 5054a49b499SJoy Latten crypto_requires_sync(algt->type, 5064a49b499SJoy Latten algt->mask)); 5074a49b499SJoy Latten if (err) 508f15f05b0SArd Biesheuvel goto err_drop_mac; 5094a49b499SJoy Latten 510464b93a3SHerbert Xu ctr = crypto_spawn_skcipher_alg(&ictx->ctr); 5114a49b499SJoy Latten 5124a49b499SJoy Latten /* Not a stream cipher? */ 5134a49b499SJoy Latten err = -EINVAL; 514464b93a3SHerbert Xu if (ctr->base.cra_blocksize != 1) 5154a49b499SJoy Latten goto err_drop_ctr; 5164a49b499SJoy Latten 5174a49b499SJoy Latten /* We want the real thing! */ 518464b93a3SHerbert Xu if (crypto_skcipher_alg_ivsize(ctr) != 16) 5194a49b499SJoy Latten goto err_drop_ctr; 5204a49b499SJoy Latten 5214a49b499SJoy Latten err = -ENAMETOOLONG; 52281c4c35eSHerbert Xu if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, 523464b93a3SHerbert Xu "ccm_base(%s,%s)", ctr->base.cra_driver_name, 524f15f05b0SArd Biesheuvel mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 5254a49b499SJoy Latten goto err_drop_ctr; 5264a49b499SJoy Latten 52781c4c35eSHerbert Xu memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME); 5284a49b499SJoy Latten 529464b93a3SHerbert Xu inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC; 530f15f05b0SArd Biesheuvel inst->alg.base.cra_priority = (mac->base.cra_priority + 531464b93a3SHerbert Xu ctr->base.cra_priority) / 2; 53281c4c35eSHerbert Xu inst->alg.base.cra_blocksize = 1; 533f15f05b0SArd Biesheuvel inst->alg.base.cra_alignmask = mac->base.cra_alignmask | 5345ba8e2a0SArd Biesheuvel ctr->base.cra_alignmask; 53581c4c35eSHerbert Xu inst->alg.ivsize = 16; 536464b93a3SHerbert Xu inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); 53781c4c35eSHerbert Xu inst->alg.maxauthsize = 16; 53881c4c35eSHerbert Xu inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx); 53981c4c35eSHerbert Xu inst->alg.init = crypto_ccm_init_tfm; 54081c4c35eSHerbert Xu inst->alg.exit = crypto_ccm_exit_tfm; 54181c4c35eSHerbert Xu inst->alg.setkey = crypto_ccm_setkey; 54281c4c35eSHerbert Xu inst->alg.setauthsize = crypto_ccm_setauthsize; 54381c4c35eSHerbert Xu inst->alg.encrypt = crypto_ccm_encrypt; 54481c4c35eSHerbert Xu inst->alg.decrypt = crypto_ccm_decrypt; 5454a49b499SJoy Latten 54681c4c35eSHerbert Xu inst->free = crypto_ccm_free; 54781c4c35eSHerbert Xu 54881c4c35eSHerbert Xu err = aead_register_instance(tmpl, inst); 54981c4c35eSHerbert Xu if (err) 55081c4c35eSHerbert Xu goto err_drop_ctr; 55181c4c35eSHerbert Xu 552f15f05b0SArd Biesheuvel out_put_mac: 553f15f05b0SArd Biesheuvel crypto_mod_put(mac_alg); 55481c4c35eSHerbert Xu return err; 5554a49b499SJoy Latten 5564a49b499SJoy Latten err_drop_ctr: 5574a49b499SJoy Latten crypto_drop_skcipher(&ictx->ctr); 558f15f05b0SArd Biesheuvel err_drop_mac: 559f15f05b0SArd Biesheuvel crypto_drop_ahash(&ictx->mac); 5604a49b499SJoy Latten err_free_inst: 5614a49b499SJoy Latten kfree(inst); 562f15f05b0SArd Biesheuvel goto out_put_mac; 5634a49b499SJoy Latten } 5644a49b499SJoy Latten 56581c4c35eSHerbert Xu static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb) 5664a49b499SJoy Latten { 5674a49b499SJoy Latten const char *cipher_name; 5684a49b499SJoy Latten char ctr_name[CRYPTO_MAX_ALG_NAME]; 569f15f05b0SArd Biesheuvel char mac_name[CRYPTO_MAX_ALG_NAME]; 5704a49b499SJoy Latten char full_name[CRYPTO_MAX_ALG_NAME]; 5714a49b499SJoy Latten 5724a49b499SJoy Latten cipher_name = crypto_attr_alg_name(tb[1]); 5734a49b499SJoy Latten if (IS_ERR(cipher_name)) 57481c4c35eSHerbert Xu return PTR_ERR(cipher_name); 5754a49b499SJoy Latten 5764a49b499SJoy Latten if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", 5774a49b499SJoy Latten cipher_name) >= CRYPTO_MAX_ALG_NAME) 57881c4c35eSHerbert Xu return -ENAMETOOLONG; 5794a49b499SJoy Latten 580f15f05b0SArd Biesheuvel if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)", 581f15f05b0SArd Biesheuvel cipher_name) >= CRYPTO_MAX_ALG_NAME) 582f15f05b0SArd Biesheuvel return -ENAMETOOLONG; 583f15f05b0SArd Biesheuvel 5844a49b499SJoy Latten if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >= 5854a49b499SJoy Latten CRYPTO_MAX_ALG_NAME) 58681c4c35eSHerbert Xu return -ENAMETOOLONG; 5874a49b499SJoy Latten 58881c4c35eSHerbert Xu return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name, 589f15f05b0SArd Biesheuvel mac_name); 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 int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key, 6164a49b499SJoy Latten unsigned int keylen) 6174a49b499SJoy Latten { 6184a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); 6194a49b499SJoy Latten struct crypto_aead *child = ctx->child; 6204a49b499SJoy Latten int err; 6214a49b499SJoy Latten 6224a49b499SJoy Latten if (keylen < 3) 6234a49b499SJoy Latten return -EINVAL; 6244a49b499SJoy Latten 6254a49b499SJoy Latten keylen -= 3; 6264a49b499SJoy Latten memcpy(ctx->nonce, key + keylen, 3); 6274a49b499SJoy Latten 6284a49b499SJoy Latten crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); 6294a49b499SJoy Latten crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & 6304a49b499SJoy Latten CRYPTO_TFM_REQ_MASK); 6314a49b499SJoy Latten err = crypto_aead_setkey(child, key, keylen); 6324a49b499SJoy Latten crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & 6334a49b499SJoy Latten CRYPTO_TFM_RES_MASK); 6344a49b499SJoy Latten 6354a49b499SJoy Latten return err; 6364a49b499SJoy Latten } 6374a49b499SJoy Latten 6384a49b499SJoy Latten static int crypto_rfc4309_setauthsize(struct crypto_aead *parent, 6394a49b499SJoy Latten unsigned int authsize) 6404a49b499SJoy Latten { 6414a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); 6424a49b499SJoy Latten 6434a49b499SJoy Latten switch (authsize) { 6444a49b499SJoy Latten case 8: 6454a49b499SJoy Latten case 12: 6464a49b499SJoy Latten case 16: 6474a49b499SJoy Latten break; 6484a49b499SJoy Latten default: 6494a49b499SJoy Latten return -EINVAL; 6504a49b499SJoy Latten } 6514a49b499SJoy Latten 6524a49b499SJoy Latten return crypto_aead_setauthsize(ctx->child, authsize); 6534a49b499SJoy Latten } 6544a49b499SJoy Latten 6554a49b499SJoy Latten static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req) 6564a49b499SJoy Latten { 65781c4c35eSHerbert Xu struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req); 65881c4c35eSHerbert Xu struct aead_request *subreq = &rctx->subreq; 6594a49b499SJoy Latten struct crypto_aead *aead = crypto_aead_reqtfm(req); 6604a49b499SJoy Latten struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead); 6614a49b499SJoy Latten struct crypto_aead *child = ctx->child; 66281c4c35eSHerbert Xu struct scatterlist *sg; 6634a49b499SJoy Latten u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), 6644a49b499SJoy Latten crypto_aead_alignmask(child) + 1); 6654a49b499SJoy Latten 6664a49b499SJoy Latten /* L' */ 6674a49b499SJoy Latten iv[0] = 3; 6684a49b499SJoy Latten 6694a49b499SJoy Latten memcpy(iv + 1, ctx->nonce, 3); 6704a49b499SJoy Latten memcpy(iv + 4, req->iv, 8); 6714a49b499SJoy Latten 67281c4c35eSHerbert Xu scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0); 67381c4c35eSHerbert Xu 67481c4c35eSHerbert Xu sg_init_table(rctx->src, 3); 67581c4c35eSHerbert Xu sg_set_buf(rctx->src, iv + 16, req->assoclen - 8); 67681c4c35eSHerbert Xu sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); 67781c4c35eSHerbert Xu if (sg != rctx->src + 1) 67881c4c35eSHerbert Xu sg_chain(rctx->src, 2, sg); 67981c4c35eSHerbert Xu 68081c4c35eSHerbert Xu if (req->src != req->dst) { 68181c4c35eSHerbert Xu sg_init_table(rctx->dst, 3); 68281c4c35eSHerbert Xu sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8); 68381c4c35eSHerbert Xu sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); 68481c4c35eSHerbert Xu if (sg != rctx->dst + 1) 68581c4c35eSHerbert Xu sg_chain(rctx->dst, 2, sg); 68681c4c35eSHerbert Xu } 68781c4c35eSHerbert Xu 6884a49b499SJoy Latten aead_request_set_tfm(subreq, child); 6894a49b499SJoy Latten aead_request_set_callback(subreq, req->base.flags, req->base.complete, 6904a49b499SJoy Latten req->base.data); 69181c4c35eSHerbert Xu aead_request_set_crypt(subreq, rctx->src, 69281c4c35eSHerbert Xu req->src == req->dst ? rctx->src : rctx->dst, 69381c4c35eSHerbert Xu req->cryptlen, iv); 69481c4c35eSHerbert Xu aead_request_set_ad(subreq, req->assoclen - 8); 6954a49b499SJoy Latten 6964a49b499SJoy Latten return subreq; 6974a49b499SJoy Latten } 6984a49b499SJoy Latten 6994a49b499SJoy Latten static int crypto_rfc4309_encrypt(struct aead_request *req) 7004a49b499SJoy Latten { 70181c4c35eSHerbert Xu if (req->assoclen != 16 && req->assoclen != 20) 70281c4c35eSHerbert Xu return -EINVAL; 70381c4c35eSHerbert Xu 7044a49b499SJoy Latten req = crypto_rfc4309_crypt(req); 7054a49b499SJoy Latten 7064a49b499SJoy Latten return crypto_aead_encrypt(req); 7074a49b499SJoy Latten } 7084a49b499SJoy Latten 7094a49b499SJoy Latten static int crypto_rfc4309_decrypt(struct aead_request *req) 7104a49b499SJoy Latten { 71181c4c35eSHerbert Xu if (req->assoclen != 16 && req->assoclen != 20) 71281c4c35eSHerbert Xu return -EINVAL; 71381c4c35eSHerbert Xu 7144a49b499SJoy Latten req = crypto_rfc4309_crypt(req); 7154a49b499SJoy Latten 7164a49b499SJoy Latten return crypto_aead_decrypt(req); 7174a49b499SJoy Latten } 7184a49b499SJoy Latten 71981c4c35eSHerbert Xu static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm) 7204a49b499SJoy Latten { 72181c4c35eSHerbert Xu struct aead_instance *inst = aead_alg_instance(tfm); 72281c4c35eSHerbert Xu struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); 72381c4c35eSHerbert Xu struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); 7244a49b499SJoy Latten struct crypto_aead *aead; 7254a49b499SJoy Latten unsigned long align; 7264a49b499SJoy Latten 7274a49b499SJoy Latten aead = crypto_spawn_aead(spawn); 7284a49b499SJoy Latten if (IS_ERR(aead)) 7294a49b499SJoy Latten return PTR_ERR(aead); 7304a49b499SJoy Latten 7314a49b499SJoy Latten ctx->child = aead; 7324a49b499SJoy Latten 7334a49b499SJoy Latten align = crypto_aead_alignmask(aead); 7344a49b499SJoy Latten align &= ~(crypto_tfm_ctx_alignment() - 1); 73581c4c35eSHerbert Xu crypto_aead_set_reqsize( 73681c4c35eSHerbert Xu tfm, 73781c4c35eSHerbert Xu sizeof(struct crypto_rfc4309_req_ctx) + 7382c221ad3SHerbert Xu ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + 73981c4c35eSHerbert Xu align + 32); 7404a49b499SJoy Latten 7414a49b499SJoy Latten return 0; 7424a49b499SJoy Latten } 7434a49b499SJoy Latten 74481c4c35eSHerbert Xu static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm) 7454a49b499SJoy Latten { 74681c4c35eSHerbert Xu struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); 7474a49b499SJoy Latten 7484a49b499SJoy Latten crypto_free_aead(ctx->child); 7494a49b499SJoy Latten } 7504a49b499SJoy Latten 75181c4c35eSHerbert Xu static void crypto_rfc4309_free(struct aead_instance *inst) 75281c4c35eSHerbert Xu { 75381c4c35eSHerbert Xu crypto_drop_aead(aead_instance_ctx(inst)); 75481c4c35eSHerbert Xu kfree(inst); 75581c4c35eSHerbert Xu } 75681c4c35eSHerbert Xu 75781c4c35eSHerbert Xu static int crypto_rfc4309_create(struct crypto_template *tmpl, 75881c4c35eSHerbert Xu struct rtattr **tb) 7594a49b499SJoy Latten { 7604a49b499SJoy Latten struct crypto_attr_type *algt; 76181c4c35eSHerbert Xu struct aead_instance *inst; 7624a49b499SJoy Latten struct crypto_aead_spawn *spawn; 76381c4c35eSHerbert Xu struct aead_alg *alg; 7644a49b499SJoy Latten const char *ccm_name; 7654a49b499SJoy Latten int err; 7664a49b499SJoy Latten 7674a49b499SJoy Latten algt = crypto_get_attr_type(tb); 7684a49b499SJoy Latten if (IS_ERR(algt)) 76981c4c35eSHerbert Xu return PTR_ERR(algt); 7704a49b499SJoy Latten 7715e4b8c1fSHerbert Xu if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 77281c4c35eSHerbert Xu return -EINVAL; 7734a49b499SJoy Latten 7744a49b499SJoy Latten ccm_name = crypto_attr_alg_name(tb[1]); 7754a49b499SJoy Latten if (IS_ERR(ccm_name)) 77681c4c35eSHerbert Xu return PTR_ERR(ccm_name); 7774a49b499SJoy Latten 7784a49b499SJoy Latten inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 7794a49b499SJoy Latten if (!inst) 78081c4c35eSHerbert Xu return -ENOMEM; 7814a49b499SJoy Latten 78281c4c35eSHerbert Xu spawn = aead_instance_ctx(inst); 78381c4c35eSHerbert Xu crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); 7844a49b499SJoy Latten err = crypto_grab_aead(spawn, ccm_name, 0, 7854a49b499SJoy Latten crypto_requires_sync(algt->type, algt->mask)); 7864a49b499SJoy Latten if (err) 7874a49b499SJoy Latten goto out_free_inst; 7884a49b499SJoy Latten 78981c4c35eSHerbert Xu alg = crypto_spawn_aead_alg(spawn); 7904a49b499SJoy Latten 7914a49b499SJoy Latten err = -EINVAL; 7924a49b499SJoy Latten 7934a49b499SJoy Latten /* We only support 16-byte blocks. */ 79481c4c35eSHerbert Xu if (crypto_aead_alg_ivsize(alg) != 16) 7954a49b499SJoy Latten goto out_drop_alg; 7964a49b499SJoy Latten 7974a49b499SJoy Latten /* Not a stream cipher? */ 79881c4c35eSHerbert Xu if (alg->base.cra_blocksize != 1) 7994a49b499SJoy Latten goto out_drop_alg; 8004a49b499SJoy Latten 8014a49b499SJoy Latten err = -ENAMETOOLONG; 80281c4c35eSHerbert Xu if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 80381c4c35eSHerbert Xu "rfc4309(%s)", alg->base.cra_name) >= 80481c4c35eSHerbert Xu CRYPTO_MAX_ALG_NAME || 80581c4c35eSHerbert Xu snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, 80681c4c35eSHerbert Xu "rfc4309(%s)", alg->base.cra_driver_name) >= 8074a49b499SJoy Latten CRYPTO_MAX_ALG_NAME) 8084a49b499SJoy Latten goto out_drop_alg; 8094a49b499SJoy Latten 81081c4c35eSHerbert Xu inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; 81181c4c35eSHerbert Xu inst->alg.base.cra_priority = alg->base.cra_priority; 81281c4c35eSHerbert Xu inst->alg.base.cra_blocksize = 1; 81381c4c35eSHerbert Xu inst->alg.base.cra_alignmask = alg->base.cra_alignmask; 8144a49b499SJoy Latten 81581c4c35eSHerbert Xu inst->alg.ivsize = 8; 816464b93a3SHerbert Xu inst->alg.chunksize = crypto_aead_alg_chunksize(alg); 81781c4c35eSHerbert Xu inst->alg.maxauthsize = 16; 8184a49b499SJoy Latten 81981c4c35eSHerbert Xu inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); 8204a49b499SJoy Latten 82181c4c35eSHerbert Xu inst->alg.init = crypto_rfc4309_init_tfm; 82281c4c35eSHerbert Xu inst->alg.exit = crypto_rfc4309_exit_tfm; 8234a49b499SJoy Latten 82481c4c35eSHerbert Xu inst->alg.setkey = crypto_rfc4309_setkey; 82581c4c35eSHerbert Xu inst->alg.setauthsize = crypto_rfc4309_setauthsize; 82681c4c35eSHerbert Xu inst->alg.encrypt = crypto_rfc4309_encrypt; 82781c4c35eSHerbert Xu inst->alg.decrypt = crypto_rfc4309_decrypt; 8284a49b499SJoy Latten 82981c4c35eSHerbert Xu inst->free = crypto_rfc4309_free; 83081c4c35eSHerbert Xu 83181c4c35eSHerbert Xu err = aead_register_instance(tmpl, inst); 83281c4c35eSHerbert Xu if (err) 83381c4c35eSHerbert Xu goto out_drop_alg; 8344a49b499SJoy Latten 8354a49b499SJoy Latten out: 83681c4c35eSHerbert Xu return err; 8374a49b499SJoy Latten 8384a49b499SJoy Latten out_drop_alg: 8394a49b499SJoy Latten crypto_drop_aead(spawn); 8404a49b499SJoy Latten out_free_inst: 8414a49b499SJoy Latten kfree(inst); 8424a49b499SJoy Latten goto out; 8434a49b499SJoy Latten } 8444a49b499SJoy Latten 845f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent, 846f15f05b0SArd Biesheuvel const u8 *inkey, unsigned int keylen) 847f15f05b0SArd Biesheuvel { 848f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent); 849f15f05b0SArd Biesheuvel 850f15f05b0SArd Biesheuvel return crypto_cipher_setkey(ctx->child, inkey, keylen); 851f15f05b0SArd Biesheuvel } 852f15f05b0SArd Biesheuvel 853f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_init(struct shash_desc *pdesc) 854f15f05b0SArd Biesheuvel { 855f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 856f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(pdesc->tfm); 8575338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs; 858f15f05b0SArd Biesheuvel 859f15f05b0SArd Biesheuvel ctx->len = 0; 8605338ad70SArd Biesheuvel memset(dg, 0, bs); 861f15f05b0SArd Biesheuvel 862f15f05b0SArd Biesheuvel return 0; 863f15f05b0SArd Biesheuvel } 864f15f05b0SArd Biesheuvel 865f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p, 866f15f05b0SArd Biesheuvel unsigned int len) 867f15f05b0SArd Biesheuvel { 868f15f05b0SArd Biesheuvel struct crypto_shash *parent = pdesc->tfm; 869f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); 870f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 871f15f05b0SArd Biesheuvel struct crypto_cipher *tfm = tctx->child; 872f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(parent); 8735338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; 874f15f05b0SArd Biesheuvel 875f15f05b0SArd Biesheuvel while (len > 0) { 876f15f05b0SArd Biesheuvel unsigned int l = min(len, bs - ctx->len); 877f15f05b0SArd Biesheuvel 8785338ad70SArd Biesheuvel crypto_xor(dg + ctx->len, p, l); 879f15f05b0SArd Biesheuvel ctx->len +=l; 880f15f05b0SArd Biesheuvel len -= l; 881f15f05b0SArd Biesheuvel p += l; 882f15f05b0SArd Biesheuvel 883f15f05b0SArd Biesheuvel if (ctx->len == bs) { 8845338ad70SArd Biesheuvel crypto_cipher_encrypt_one(tfm, dg, dg); 885f15f05b0SArd Biesheuvel ctx->len = 0; 886f15f05b0SArd Biesheuvel } 887f15f05b0SArd Biesheuvel } 888f15f05b0SArd Biesheuvel 889f15f05b0SArd Biesheuvel return 0; 890f15f05b0SArd Biesheuvel } 891f15f05b0SArd Biesheuvel 892f15f05b0SArd Biesheuvel static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out) 893f15f05b0SArd Biesheuvel { 894f15f05b0SArd Biesheuvel struct crypto_shash *parent = pdesc->tfm; 895f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); 896f15f05b0SArd Biesheuvel struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 897f15f05b0SArd Biesheuvel struct crypto_cipher *tfm = tctx->child; 898f15f05b0SArd Biesheuvel int bs = crypto_shash_digestsize(parent); 8995338ad70SArd Biesheuvel u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; 900f15f05b0SArd Biesheuvel 901f15f05b0SArd Biesheuvel if (ctx->len) 9025338ad70SArd Biesheuvel crypto_cipher_encrypt_one(tfm, dg, dg); 903f15f05b0SArd Biesheuvel 9045338ad70SArd Biesheuvel memcpy(out, dg, bs); 905f15f05b0SArd Biesheuvel return 0; 906f15f05b0SArd Biesheuvel } 907f15f05b0SArd Biesheuvel 908f15f05b0SArd Biesheuvel static int cbcmac_init_tfm(struct crypto_tfm *tfm) 909f15f05b0SArd Biesheuvel { 910f15f05b0SArd Biesheuvel struct crypto_cipher *cipher; 911f15f05b0SArd Biesheuvel struct crypto_instance *inst = (void *)tfm->__crt_alg; 912f15f05b0SArd Biesheuvel struct crypto_spawn *spawn = crypto_instance_ctx(inst); 913f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 914f15f05b0SArd Biesheuvel 915f15f05b0SArd Biesheuvel cipher = crypto_spawn_cipher(spawn); 916f15f05b0SArd Biesheuvel if (IS_ERR(cipher)) 917f15f05b0SArd Biesheuvel return PTR_ERR(cipher); 918f15f05b0SArd Biesheuvel 919f15f05b0SArd Biesheuvel ctx->child = cipher; 920f15f05b0SArd Biesheuvel 921f15f05b0SArd Biesheuvel return 0; 922f15f05b0SArd Biesheuvel }; 923f15f05b0SArd Biesheuvel 924f15f05b0SArd Biesheuvel static void cbcmac_exit_tfm(struct crypto_tfm *tfm) 925f15f05b0SArd Biesheuvel { 926f15f05b0SArd Biesheuvel struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 927f15f05b0SArd Biesheuvel crypto_free_cipher(ctx->child); 928f15f05b0SArd Biesheuvel } 929f15f05b0SArd Biesheuvel 930f15f05b0SArd Biesheuvel static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb) 931f15f05b0SArd Biesheuvel { 932f15f05b0SArd Biesheuvel struct shash_instance *inst; 933f15f05b0SArd Biesheuvel struct crypto_alg *alg; 934f15f05b0SArd Biesheuvel int err; 935f15f05b0SArd Biesheuvel 936f15f05b0SArd Biesheuvel err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); 937f15f05b0SArd Biesheuvel if (err) 938f15f05b0SArd Biesheuvel return err; 939f15f05b0SArd Biesheuvel 940f15f05b0SArd Biesheuvel alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, 941f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_MASK); 942f15f05b0SArd Biesheuvel if (IS_ERR(alg)) 943f15f05b0SArd Biesheuvel return PTR_ERR(alg); 944f15f05b0SArd Biesheuvel 945f15f05b0SArd Biesheuvel inst = shash_alloc_instance("cbcmac", alg); 946f15f05b0SArd Biesheuvel err = PTR_ERR(inst); 947f15f05b0SArd Biesheuvel if (IS_ERR(inst)) 948f15f05b0SArd Biesheuvel goto out_put_alg; 949f15f05b0SArd Biesheuvel 950f15f05b0SArd Biesheuvel err = crypto_init_spawn(shash_instance_ctx(inst), alg, 951f15f05b0SArd Biesheuvel shash_crypto_instance(inst), 952f15f05b0SArd Biesheuvel CRYPTO_ALG_TYPE_MASK); 953f15f05b0SArd Biesheuvel if (err) 954f15f05b0SArd Biesheuvel goto out_free_inst; 955f15f05b0SArd Biesheuvel 956f15f05b0SArd Biesheuvel inst->alg.base.cra_priority = alg->cra_priority; 957f15f05b0SArd Biesheuvel inst->alg.base.cra_blocksize = 1; 958f15f05b0SArd Biesheuvel 959f15f05b0SArd Biesheuvel inst->alg.digestsize = alg->cra_blocksize; 9605338ad70SArd Biesheuvel inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx), 9615338ad70SArd Biesheuvel alg->cra_alignmask + 1) + 962f15f05b0SArd Biesheuvel alg->cra_blocksize; 963f15f05b0SArd Biesheuvel 964f15f05b0SArd Biesheuvel inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx); 965f15f05b0SArd Biesheuvel inst->alg.base.cra_init = cbcmac_init_tfm; 966f15f05b0SArd Biesheuvel inst->alg.base.cra_exit = cbcmac_exit_tfm; 967f15f05b0SArd Biesheuvel 968f15f05b0SArd Biesheuvel inst->alg.init = crypto_cbcmac_digest_init; 969f15f05b0SArd Biesheuvel inst->alg.update = crypto_cbcmac_digest_update; 970f15f05b0SArd Biesheuvel inst->alg.final = crypto_cbcmac_digest_final; 971f15f05b0SArd Biesheuvel inst->alg.setkey = crypto_cbcmac_digest_setkey; 972f15f05b0SArd Biesheuvel 973f15f05b0SArd Biesheuvel err = shash_register_instance(tmpl, inst); 974f15f05b0SArd Biesheuvel 975f15f05b0SArd Biesheuvel out_free_inst: 976f15f05b0SArd Biesheuvel if (err) 977f15f05b0SArd Biesheuvel shash_free_instance(shash_crypto_instance(inst)); 978f15f05b0SArd Biesheuvel 979f15f05b0SArd Biesheuvel out_put_alg: 980f15f05b0SArd Biesheuvel crypto_mod_put(alg); 981f15f05b0SArd Biesheuvel return err; 982f15f05b0SArd Biesheuvel } 983f15f05b0SArd Biesheuvel 9840db19035SXiongfeng Wang static struct crypto_template crypto_ccm_tmpls[] = { 9850db19035SXiongfeng Wang { 986f15f05b0SArd Biesheuvel .name = "cbcmac", 987f15f05b0SArd Biesheuvel .create = cbcmac_create, 988f15f05b0SArd Biesheuvel .free = shash_free_instance, 989f15f05b0SArd Biesheuvel .module = THIS_MODULE, 9900db19035SXiongfeng Wang }, { 9910db19035SXiongfeng Wang .name = "ccm_base", 9920db19035SXiongfeng Wang .create = crypto_ccm_base_create, 9930db19035SXiongfeng Wang .module = THIS_MODULE, 9940db19035SXiongfeng Wang }, { 9950db19035SXiongfeng Wang .name = "ccm", 9960db19035SXiongfeng Wang .create = crypto_ccm_create, 9970db19035SXiongfeng Wang .module = THIS_MODULE, 9980db19035SXiongfeng Wang }, { 9990db19035SXiongfeng Wang .name = "rfc4309", 10000db19035SXiongfeng Wang .create = crypto_rfc4309_create, 10010db19035SXiongfeng Wang .module = THIS_MODULE, 10020db19035SXiongfeng Wang }, 1003f15f05b0SArd Biesheuvel }; 1004f15f05b0SArd Biesheuvel 10054a49b499SJoy Latten static int __init crypto_ccm_module_init(void) 10064a49b499SJoy Latten { 10070db19035SXiongfeng Wang return crypto_register_templates(crypto_ccm_tmpls, 10080db19035SXiongfeng Wang ARRAY_SIZE(crypto_ccm_tmpls)); 10094a49b499SJoy Latten } 10104a49b499SJoy Latten 10114a49b499SJoy Latten static void __exit crypto_ccm_module_exit(void) 10124a49b499SJoy Latten { 10130db19035SXiongfeng Wang crypto_unregister_templates(crypto_ccm_tmpls, 10140db19035SXiongfeng Wang ARRAY_SIZE(crypto_ccm_tmpls)); 10154a49b499SJoy Latten } 10164a49b499SJoy Latten 10174a49b499SJoy Latten module_init(crypto_ccm_module_init); 10184a49b499SJoy Latten module_exit(crypto_ccm_module_exit); 10194a49b499SJoy Latten 10204a49b499SJoy Latten MODULE_LICENSE("GPL"); 10214a49b499SJoy Latten MODULE_DESCRIPTION("Counter with CBC MAC"); 10225d26a105SKees Cook MODULE_ALIAS_CRYPTO("ccm_base"); 10235d26a105SKees Cook MODULE_ALIAS_CRYPTO("rfc4309"); 10244943ba16SKees Cook MODULE_ALIAS_CRYPTO("ccm"); 1025