| /* |
| * CCM: Counter with CBC-MAC |
| * |
| * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| */ |
| |
| #include <crypto/internal/aead.h> |
| #include <crypto/internal/hash.h> |
| #include <crypto/internal/skcipher.h> |
| #include <crypto/scatterwalk.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| |
| #include "internal.h" |
| |
| struct ccm_instance_ctx { |
| struct crypto_skcipher_spawn ctr; |
| struct crypto_ahash_spawn mac; |
| }; |
| |
| struct crypto_ccm_ctx { |
| struct crypto_ahash *mac; |
| struct crypto_skcipher *ctr; |
| }; |
| |
| struct crypto_rfc4309_ctx { |
| struct crypto_aead *child; |
| u8 nonce[3]; |
| }; |
| |
| struct crypto_rfc4309_req_ctx { |
| struct scatterlist src[3]; |
| struct scatterlist dst[3]; |
| struct aead_request subreq; |
| }; |
| |
| struct crypto_ccm_req_priv_ctx { |
| u8 odata[16]; |
| u8 idata[16]; |
| u8 auth_tag[16]; |
| u32 flags; |
| struct scatterlist src[3]; |
| struct scatterlist dst[3]; |
| union { |
| struct ahash_request ahreq; |
| struct skcipher_request skreq; |
| }; |
| }; |
| |
| struct cbcmac_tfm_ctx { |
| struct crypto_cipher *child; |
| }; |
| |
| struct cbcmac_desc_ctx { |
| unsigned int len; |
| }; |
| |
| static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx( |
| struct aead_request *req) |
| { |
| unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); |
| |
| return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); |
| } |
| |
| static int set_msg_len(u8 *block, unsigned int msglen, int csize) |
| { |
| __be32 data; |
| |
| memset(block, 0, csize); |
| block += csize; |
| |
| if (csize >= 4) |
| csize = 4; |
| else if (msglen > (1 << (8 * csize))) |
| return -EOVERFLOW; |
| |
| data = cpu_to_be32(msglen); |
| memcpy(block - csize, (u8 *)&data + 4 - csize, csize); |
| |
| return 0; |
| } |
| |
| static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key, |
| unsigned int keylen) |
| { |
| struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
| struct crypto_skcipher *ctr = ctx->ctr; |
| struct crypto_ahash *mac = ctx->mac; |
| int err = 0; |
| |
| crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); |
| crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & |
| CRYPTO_TFM_REQ_MASK); |
| err = crypto_skcipher_setkey(ctr, key, keylen); |
| crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) & |
| CRYPTO_TFM_RES_MASK); |
| if (err) |
| goto out; |
| |
| crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK); |
| crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) & |
| CRYPTO_TFM_REQ_MASK); |
| err = crypto_ahash_setkey(mac, key, keylen); |
| crypto_aead_set_flags(aead, crypto_ahash_get_flags(mac) & |
| CRYPTO_TFM_RES_MASK); |
| |
| out: |
| return err; |
| } |
| |
| static int crypto_ccm_setauthsize(struct crypto_aead *tfm, |
| unsigned int authsize) |
| { |
| switch (authsize) { |
| case 4: |
| case 6: |
| case 8: |
| case 10: |
| case 12: |
| case 14: |
| case 16: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int format_input(u8 *info, struct aead_request *req, |
| unsigned int cryptlen) |
| { |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| unsigned int lp = req->iv[0]; |
| unsigned int l = lp + 1; |
| unsigned int m; |
| |
| m = crypto_aead_authsize(aead); |
| |
| memcpy(info, req->iv, 16); |
| |
| /* format control info per RFC 3610 and |
| * NIST Special Publication 800-38C |
| */ |
| *info |= (8 * ((m - 2) / 2)); |
| if (req->assoclen) |
| *info |= 64; |
| |
| return set_msg_len(info + 16 - l, cryptlen, l); |
| } |
| |
| static int format_adata(u8 *adata, unsigned int a) |
| { |
| int len = 0; |
| |
| /* add control info for associated data |
| * RFC 3610 and NIST Special Publication 800-38C |
| */ |
| if (a < 65280) { |
| *(__be16 *)adata = cpu_to_be16(a); |
| len = 2; |
| } else { |
| *(__be16 *)adata = cpu_to_be16(0xfffe); |
| *(__be32 *)&adata[2] = cpu_to_be32(a); |
| len = 6; |
| } |
| |
| return len; |
| } |
| |
| static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain, |
| unsigned int cryptlen) |
| { |
| struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
| struct ahash_request *ahreq = &pctx->ahreq; |
| unsigned int assoclen = req->assoclen; |
| struct scatterlist sg[3]; |
| u8 *odata = pctx->odata; |
| u8 *idata = pctx->idata; |
| int ilen, err; |
| |
| /* format control data for input */ |
| err = format_input(odata, req, cryptlen); |
| if (err) |
| goto out; |
| |
| sg_init_table(sg, 3); |
| sg_set_buf(&sg[0], odata, 16); |
| |
| /* format associated data and compute into mac */ |
| if (assoclen) { |
| ilen = format_adata(idata, assoclen); |
| sg_set_buf(&sg[1], idata, ilen); |
| sg_chain(sg, 3, req->src); |
| } else { |
| ilen = 0; |
| sg_chain(sg, 2, req->src); |
| } |
| |
| ahash_request_set_tfm(ahreq, ctx->mac); |
| ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL); |
| ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16); |
| err = crypto_ahash_init(ahreq); |
| if (err) |
| goto out; |
| err = crypto_ahash_update(ahreq); |
| if (err) |
| goto out; |
| |
| /* we need to pad the MAC input to a round multiple of the block size */ |
| ilen = 16 - (assoclen + ilen) % 16; |
| if (ilen < 16) { |
| memset(idata, 0, ilen); |
| sg_init_table(sg, 2); |
| sg_set_buf(&sg[0], idata, ilen); |
| if (plain) |
| sg_chain(sg, 2, plain); |
| plain = sg; |
| cryptlen += ilen; |
| } |
| |
| ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen); |
| err = crypto_ahash_finup(ahreq); |
| out: |
| return err; |
| } |
| |
| static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err) |
| { |
| struct aead_request *req = areq->data; |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| u8 *odata = pctx->odata; |
| |
| if (!err) |
| scatterwalk_map_and_copy(odata, req->dst, |
| req->assoclen + req->cryptlen, |
| crypto_aead_authsize(aead), 1); |
| aead_request_complete(req, err); |
| } |
| |
| static inline int crypto_ccm_check_iv(const u8 *iv) |
| { |
| /* 2 <= L <= 8, so 1 <= L' <= 7. */ |
| if (1 > iv[0] || iv[0] > 7) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag) |
| { |
| struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| struct scatterlist *sg; |
| u8 *iv = req->iv; |
| int err; |
| |
| err = crypto_ccm_check_iv(iv); |
| if (err) |
| return err; |
| |
| pctx->flags = aead_request_flags(req); |
| |
| /* Note: rfc 3610 and NIST 800-38C require counter of |
| * zero to encrypt auth tag. |
| */ |
| memset(iv + 15 - iv[0], 0, iv[0] + 1); |
| |
| sg_init_table(pctx->src, 3); |
| sg_set_buf(pctx->src, tag, 16); |
| sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); |
| if (sg != pctx->src + 1) |
| sg_chain(pctx->src, 2, sg); |
| |
| if (req->src != req->dst) { |
| sg_init_table(pctx->dst, 3); |
| sg_set_buf(pctx->dst, tag, 16); |
| sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); |
| if (sg != pctx->dst + 1) |
| sg_chain(pctx->dst, 2, sg); |
| } |
| |
| return 0; |
| } |
| |
| static int crypto_ccm_encrypt(struct aead_request *req) |
| { |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
| struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| struct skcipher_request *skreq = &pctx->skreq; |
| struct scatterlist *dst; |
| unsigned int cryptlen = req->cryptlen; |
| u8 *odata = pctx->odata; |
| u8 *iv = req->iv; |
| int err; |
| |
| err = crypto_ccm_init_crypt(req, odata); |
| if (err) |
| return err; |
| |
| err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen); |
| if (err) |
| return err; |
| |
| dst = pctx->src; |
| if (req->src != req->dst) |
| dst = pctx->dst; |
| |
| skcipher_request_set_tfm(skreq, ctx->ctr); |
| skcipher_request_set_callback(skreq, pctx->flags, |
| crypto_ccm_encrypt_done, req); |
| skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); |
| err = crypto_skcipher_encrypt(skreq); |
| if (err) |
| return err; |
| |
| /* copy authtag to end of dst */ |
| scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen, |
| crypto_aead_authsize(aead), 1); |
| return err; |
| } |
| |
| static void crypto_ccm_decrypt_done(struct crypto_async_request *areq, |
| int err) |
| { |
| struct aead_request *req = areq->data; |
| struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| unsigned int authsize = crypto_aead_authsize(aead); |
| unsigned int cryptlen = req->cryptlen - authsize; |
| struct scatterlist *dst; |
| |
| pctx->flags = 0; |
| |
| dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
| |
| if (!err) { |
| err = crypto_ccm_auth(req, dst, cryptlen); |
| if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize)) |
| err = -EBADMSG; |
| } |
| aead_request_complete(req, err); |
| } |
| |
| static int crypto_ccm_decrypt(struct aead_request *req) |
| { |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
| struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| struct skcipher_request *skreq = &pctx->skreq; |
| struct scatterlist *dst; |
| unsigned int authsize = crypto_aead_authsize(aead); |
| unsigned int cryptlen = req->cryptlen; |
| u8 *authtag = pctx->auth_tag; |
| u8 *odata = pctx->odata; |
| u8 *iv = pctx->idata; |
| int err; |
| |
| cryptlen -= authsize; |
| |
| err = crypto_ccm_init_crypt(req, authtag); |
| if (err) |
| return err; |
| |
| scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen, |
| authsize, 0); |
| |
| dst = pctx->src; |
| if (req->src != req->dst) |
| dst = pctx->dst; |
| |
| memcpy(iv, req->iv, 16); |
| |
| skcipher_request_set_tfm(skreq, ctx->ctr); |
| skcipher_request_set_callback(skreq, pctx->flags, |
| crypto_ccm_decrypt_done, req); |
| skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); |
| err = crypto_skcipher_decrypt(skreq); |
| if (err) |
| return err; |
| |
| err = crypto_ccm_auth(req, sg_next(dst), cryptlen); |
| if (err) |
| return err; |
| |
| /* verify */ |
| if (crypto_memneq(authtag, odata, authsize)) |
| return -EBADMSG; |
| |
| return err; |
| } |
| |
| static int crypto_ccm_init_tfm(struct crypto_aead *tfm) |
| { |
| struct aead_instance *inst = aead_alg_instance(tfm); |
| struct ccm_instance_ctx *ictx = aead_instance_ctx(inst); |
| struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); |
| struct crypto_ahash *mac; |
| struct crypto_skcipher *ctr; |
| unsigned long align; |
| int err; |
| |
| mac = crypto_spawn_ahash(&ictx->mac); |
| if (IS_ERR(mac)) |
| return PTR_ERR(mac); |
| |
| ctr = crypto_spawn_skcipher(&ictx->ctr); |
| err = PTR_ERR(ctr); |
| if (IS_ERR(ctr)) |
| goto err_free_mac; |
| |
| ctx->mac = mac; |
| ctx->ctr = ctr; |
| |
| align = crypto_aead_alignmask(tfm); |
| align &= ~(crypto_tfm_ctx_alignment() - 1); |
| crypto_aead_set_reqsize( |
| tfm, |
| align + sizeof(struct crypto_ccm_req_priv_ctx) + |
| max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr))); |
| |
| return 0; |
| |
| err_free_mac: |
| crypto_free_ahash(mac); |
| return err; |
| } |
| |
| static void crypto_ccm_exit_tfm(struct crypto_aead *tfm) |
| { |
| struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); |
| |
| crypto_free_ahash(ctx->mac); |
| crypto_free_skcipher(ctx->ctr); |
| } |
| |
| static void crypto_ccm_free(struct aead_instance *inst) |
| { |
| struct ccm_instance_ctx *ctx = aead_instance_ctx(inst); |
| |
| crypto_drop_ahash(&ctx->mac); |
| crypto_drop_skcipher(&ctx->ctr); |
| kfree(inst); |
| } |
| |
| static int crypto_ccm_create_common(struct crypto_template *tmpl, |
| struct rtattr **tb, |
| const char *full_name, |
| const char *ctr_name, |
| const char *mac_name) |
| { |
| struct crypto_attr_type *algt; |
| struct aead_instance *inst; |
| struct skcipher_alg *ctr; |
| struct crypto_alg *mac_alg; |
| struct hash_alg_common *mac; |
| struct ccm_instance_ctx *ictx; |
| int err; |
| |
| algt = crypto_get_attr_type(tb); |
| if (IS_ERR(algt)) |
| return PTR_ERR(algt); |
| |
| if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| return -EINVAL; |
| |
| mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type, |
| CRYPTO_ALG_TYPE_HASH, |
| CRYPTO_ALG_TYPE_AHASH_MASK | |
| CRYPTO_ALG_ASYNC); |
| if (IS_ERR(mac_alg)) |
| return PTR_ERR(mac_alg); |
| |
| mac = __crypto_hash_alg_common(mac_alg); |
| err = -EINVAL; |
| if (mac->digestsize != 16) |
| goto out_put_mac; |
| |
| inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); |
| err = -ENOMEM; |
| if (!inst) |
| goto out_put_mac; |
| |
| ictx = aead_instance_ctx(inst); |
| err = crypto_init_ahash_spawn(&ictx->mac, mac, |
| aead_crypto_instance(inst)); |
| if (err) |
| goto err_free_inst; |
| |
| crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst)); |
| err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0, |
| crypto_requires_sync(algt->type, |
| algt->mask)); |
| if (err) |
| goto err_drop_mac; |
| |
| ctr = crypto_spawn_skcipher_alg(&ictx->ctr); |
| |
| /* Not a stream cipher? */ |
| err = -EINVAL; |
| if (ctr->base.cra_blocksize != 1) |
| goto err_drop_ctr; |
| |
| /* We want the real thing! */ |
| if (crypto_skcipher_alg_ivsize(ctr) != 16) |
| goto err_drop_ctr; |
| |
| err = -ENAMETOOLONG; |
| if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| "ccm_base(%s,%s)", ctr->base.cra_driver_name, |
| mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| goto err_drop_ctr; |
| |
| memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
| |
| inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC; |
| inst->alg.base.cra_priority = (mac->base.cra_priority + |
| ctr->base.cra_priority) / 2; |
| inst->alg.base.cra_blocksize = 1; |
| inst->alg.base.cra_alignmask = mac->base.cra_alignmask | |
| ctr->base.cra_alignmask; |
| inst->alg.ivsize = 16; |
| inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); |
| inst->alg.maxauthsize = 16; |
| inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx); |
| inst->alg.init = crypto_ccm_init_tfm; |
| inst->alg.exit = crypto_ccm_exit_tfm; |
| inst->alg.setkey = crypto_ccm_setkey; |
| inst->alg.setauthsize = crypto_ccm_setauthsize; |
| inst->alg.encrypt = crypto_ccm_encrypt; |
| inst->alg.decrypt = crypto_ccm_decrypt; |
| |
| inst->free = crypto_ccm_free; |
| |
| err = aead_register_instance(tmpl, inst); |
| if (err) |
| goto err_drop_ctr; |
| |
| out_put_mac: |
| crypto_mod_put(mac_alg); |
| return err; |
| |
| err_drop_ctr: |
| crypto_drop_skcipher(&ictx->ctr); |
| err_drop_mac: |
| crypto_drop_ahash(&ictx->mac); |
| err_free_inst: |
| kfree(inst); |
| goto out_put_mac; |
| } |
| |
| static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb) |
| { |
| const char *cipher_name; |
| char ctr_name[CRYPTO_MAX_ALG_NAME]; |
| char mac_name[CRYPTO_MAX_ALG_NAME]; |
| char full_name[CRYPTO_MAX_ALG_NAME]; |
| |
| cipher_name = crypto_attr_alg_name(tb[1]); |
| if (IS_ERR(cipher_name)) |
| return PTR_ERR(cipher_name); |
| |
| if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", |
| cipher_name) >= CRYPTO_MAX_ALG_NAME) |
| return -ENAMETOOLONG; |
| |
| if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)", |
| cipher_name) >= CRYPTO_MAX_ALG_NAME) |
| return -ENAMETOOLONG; |
| |
| if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >= |
| CRYPTO_MAX_ALG_NAME) |
| return -ENAMETOOLONG; |
| |
| return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name, |
| mac_name); |
| } |
| |
| static int crypto_ccm_base_create(struct crypto_template *tmpl, |
| struct rtattr **tb) |
| { |
| const char *ctr_name; |
| const char *cipher_name; |
| char full_name[CRYPTO_MAX_ALG_NAME]; |
| |
| ctr_name = crypto_attr_alg_name(tb[1]); |
| if (IS_ERR(ctr_name)) |
| return PTR_ERR(ctr_name); |
| |
| cipher_name = crypto_attr_alg_name(tb[2]); |
| if (IS_ERR(cipher_name)) |
| return PTR_ERR(cipher_name); |
| |
| if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)", |
| ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME) |
| return -ENAMETOOLONG; |
| |
| return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name, |
| cipher_name); |
| } |
| |
| static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key, |
| unsigned int keylen) |
| { |
| struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); |
| struct crypto_aead *child = ctx->child; |
| int err; |
| |
| if (keylen < 3) |
| return -EINVAL; |
| |
| keylen -= 3; |
| memcpy(ctx->nonce, key + keylen, 3); |
| |
| crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
| crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & |
| CRYPTO_TFM_REQ_MASK); |
| err = crypto_aead_setkey(child, key, keylen); |
| crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & |
| CRYPTO_TFM_RES_MASK); |
| |
| return err; |
| } |
| |
| static int crypto_rfc4309_setauthsize(struct crypto_aead *parent, |
| unsigned int authsize) |
| { |
| struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); |
| |
| switch (authsize) { |
| case 8: |
| case 12: |
| case 16: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return crypto_aead_setauthsize(ctx->child, authsize); |
| } |
| |
| static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req) |
| { |
| struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req); |
| struct aead_request *subreq = &rctx->subreq; |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead); |
| struct crypto_aead *child = ctx->child; |
| struct scatterlist *sg; |
| u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), |
| crypto_aead_alignmask(child) + 1); |
| |
| /* L' */ |
| iv[0] = 3; |
| |
| memcpy(iv + 1, ctx->nonce, 3); |
| memcpy(iv + 4, req->iv, 8); |
| |
| scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0); |
| |
| sg_init_table(rctx->src, 3); |
| sg_set_buf(rctx->src, iv + 16, req->assoclen - 8); |
| sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); |
| if (sg != rctx->src + 1) |
| sg_chain(rctx->src, 2, sg); |
| |
| if (req->src != req->dst) { |
| sg_init_table(rctx->dst, 3); |
| sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8); |
| sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); |
| if (sg != rctx->dst + 1) |
| sg_chain(rctx->dst, 2, sg); |
| } |
| |
| aead_request_set_tfm(subreq, child); |
| aead_request_set_callback(subreq, req->base.flags, req->base.complete, |
| req->base.data); |
| aead_request_set_crypt(subreq, rctx->src, |
| req->src == req->dst ? rctx->src : rctx->dst, |
| req->cryptlen, iv); |
| aead_request_set_ad(subreq, req->assoclen - 8); |
| |
| return subreq; |
| } |
| |
| static int crypto_rfc4309_encrypt(struct aead_request *req) |
| { |
| if (req->assoclen != 16 && req->assoclen != 20) |
| return -EINVAL; |
| |
| req = crypto_rfc4309_crypt(req); |
| |
| return crypto_aead_encrypt(req); |
| } |
| |
| static int crypto_rfc4309_decrypt(struct aead_request *req) |
| { |
| if (req->assoclen != 16 && req->assoclen != 20) |
| return -EINVAL; |
| |
| req = crypto_rfc4309_crypt(req); |
| |
| return crypto_aead_decrypt(req); |
| } |
| |
| static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm) |
| { |
| struct aead_instance *inst = aead_alg_instance(tfm); |
| struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); |
| struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); |
| struct crypto_aead *aead; |
| unsigned long align; |
| |
| aead = crypto_spawn_aead(spawn); |
| if (IS_ERR(aead)) |
| return PTR_ERR(aead); |
| |
| ctx->child = aead; |
| |
| align = crypto_aead_alignmask(aead); |
| align &= ~(crypto_tfm_ctx_alignment() - 1); |
| crypto_aead_set_reqsize( |
| tfm, |
| sizeof(struct crypto_rfc4309_req_ctx) + |
| ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
| align + 32); |
| |
| return 0; |
| } |
| |
| static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm) |
| { |
| struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); |
| |
| crypto_free_aead(ctx->child); |
| } |
| |
| static void crypto_rfc4309_free(struct aead_instance *inst) |
| { |
| crypto_drop_aead(aead_instance_ctx(inst)); |
| kfree(inst); |
| } |
| |
| static int crypto_rfc4309_create(struct crypto_template *tmpl, |
| struct rtattr **tb) |
| { |
| struct crypto_attr_type *algt; |
| struct aead_instance *inst; |
| struct crypto_aead_spawn *spawn; |
| struct aead_alg *alg; |
| const char *ccm_name; |
| int err; |
| |
| algt = crypto_get_attr_type(tb); |
| if (IS_ERR(algt)) |
| return PTR_ERR(algt); |
| |
| if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| return -EINVAL; |
| |
| ccm_name = crypto_attr_alg_name(tb[1]); |
| if (IS_ERR(ccm_name)) |
| return PTR_ERR(ccm_name); |
| |
| inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
| if (!inst) |
| return -ENOMEM; |
| |
| spawn = aead_instance_ctx(inst); |
| crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
| err = crypto_grab_aead(spawn, ccm_name, 0, |
| crypto_requires_sync(algt->type, algt->mask)); |
| if (err) |
| goto out_free_inst; |
| |
| alg = crypto_spawn_aead_alg(spawn); |
| |
| err = -EINVAL; |
| |
| /* We only support 16-byte blocks. */ |
| if (crypto_aead_alg_ivsize(alg) != 16) |
| goto out_drop_alg; |
| |
| /* Not a stream cipher? */ |
| if (alg->base.cra_blocksize != 1) |
| goto out_drop_alg; |
| |
| err = -ENAMETOOLONG; |
| if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| "rfc4309(%s)", alg->base.cra_name) >= |
| CRYPTO_MAX_ALG_NAME || |
| snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| "rfc4309(%s)", alg->base.cra_driver_name) >= |
| CRYPTO_MAX_ALG_NAME) |
| goto out_drop_alg; |
| |
| inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
| inst->alg.base.cra_priority = alg->base.cra_priority; |
| inst->alg.base.cra_blocksize = 1; |
| inst->alg.base.cra_alignmask = alg->base.cra_alignmask; |
| |
| inst->alg.ivsize = 8; |
| inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
| inst->alg.maxauthsize = 16; |
| |
| inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); |
| |
| inst->alg.init = crypto_rfc4309_init_tfm; |
| inst->alg.exit = crypto_rfc4309_exit_tfm; |
| |
| inst->alg.setkey = crypto_rfc4309_setkey; |
| inst->alg.setauthsize = crypto_rfc4309_setauthsize; |
| inst->alg.encrypt = crypto_rfc4309_encrypt; |
| inst->alg.decrypt = crypto_rfc4309_decrypt; |
| |
| inst->free = crypto_rfc4309_free; |
| |
| err = aead_register_instance(tmpl, inst); |
| if (err) |
| goto out_drop_alg; |
| |
| out: |
| return err; |
| |
| out_drop_alg: |
| crypto_drop_aead(spawn); |
| out_free_inst: |
| kfree(inst); |
| goto out; |
| } |
| |
| static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent, |
| const u8 *inkey, unsigned int keylen) |
| { |
| struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent); |
| |
| return crypto_cipher_setkey(ctx->child, inkey, keylen); |
| } |
| |
| static int crypto_cbcmac_digest_init(struct shash_desc *pdesc) |
| { |
| struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); |
| int bs = crypto_shash_digestsize(pdesc->tfm); |
| u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs; |
| |
| ctx->len = 0; |
| memset(dg, 0, bs); |
| |
| return 0; |
| } |
| |
| static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p, |
| unsigned int len) |
| { |
| struct crypto_shash *parent = pdesc->tfm; |
| struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); |
| struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); |
| struct crypto_cipher *tfm = tctx->child; |
| int bs = crypto_shash_digestsize(parent); |
| u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; |
| |
| while (len > 0) { |
| unsigned int l = min(len, bs - ctx->len); |
| |
| crypto_xor(dg + ctx->len, p, l); |
| ctx->len +=l; |
| len -= l; |
| p += l; |
| |
| if (ctx->len == bs) { |
| crypto_cipher_encrypt_one(tfm, dg, dg); |
| ctx->len = 0; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out) |
| { |
| struct crypto_shash *parent = pdesc->tfm; |
| struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); |
| struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); |
| struct crypto_cipher *tfm = tctx->child; |
| int bs = crypto_shash_digestsize(parent); |
| u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; |
| |
| if (ctx->len) |
| crypto_cipher_encrypt_one(tfm, dg, dg); |
| |
| memcpy(out, dg, bs); |
| return 0; |
| } |
| |
| static int cbcmac_init_tfm(struct crypto_tfm *tfm) |
| { |
| struct crypto_cipher *cipher; |
| struct crypto_instance *inst = (void *)tfm->__crt_alg; |
| struct crypto_spawn *spawn = crypto_instance_ctx(inst); |
| struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
| |
| cipher = crypto_spawn_cipher(spawn); |
| if (IS_ERR(cipher)) |
| return PTR_ERR(cipher); |
| |
| ctx->child = cipher; |
| |
| return 0; |
| }; |
| |
| static void cbcmac_exit_tfm(struct crypto_tfm *tfm) |
| { |
| struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
| crypto_free_cipher(ctx->child); |
| } |
| |
| static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb) |
| { |
| struct shash_instance *inst; |
| struct crypto_alg *alg; |
| int err; |
| |
| err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); |
| if (err) |
| return err; |
| |
| alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, |
| CRYPTO_ALG_TYPE_MASK); |
| if (IS_ERR(alg)) |
| return PTR_ERR(alg); |
| |
| inst = shash_alloc_instance("cbcmac", alg); |
| err = PTR_ERR(inst); |
| if (IS_ERR(inst)) |
| goto out_put_alg; |
| |
| err = crypto_init_spawn(shash_instance_ctx(inst), alg, |
| shash_crypto_instance(inst), |
| CRYPTO_ALG_TYPE_MASK); |
| if (err) |
| goto out_free_inst; |
| |
| inst->alg.base.cra_priority = alg->cra_priority; |
| inst->alg.base.cra_blocksize = 1; |
| |
| inst->alg.digestsize = alg->cra_blocksize; |
| inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx), |
| alg->cra_alignmask + 1) + |
| alg->cra_blocksize; |
| |
| inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx); |
| inst->alg.base.cra_init = cbcmac_init_tfm; |
| inst->alg.base.cra_exit = cbcmac_exit_tfm; |
| |
| inst->alg.init = crypto_cbcmac_digest_init; |
| inst->alg.update = crypto_cbcmac_digest_update; |
| inst->alg.final = crypto_cbcmac_digest_final; |
| inst->alg.setkey = crypto_cbcmac_digest_setkey; |
| |
| err = shash_register_instance(tmpl, inst); |
| |
| out_free_inst: |
| if (err) |
| shash_free_instance(shash_crypto_instance(inst)); |
| |
| out_put_alg: |
| crypto_mod_put(alg); |
| return err; |
| } |
| |
| static struct crypto_template crypto_ccm_tmpls[] = { |
| { |
| .name = "cbcmac", |
| .create = cbcmac_create, |
| .free = shash_free_instance, |
| .module = THIS_MODULE, |
| }, { |
| .name = "ccm_base", |
| .create = crypto_ccm_base_create, |
| .module = THIS_MODULE, |
| }, { |
| .name = "ccm", |
| .create = crypto_ccm_create, |
| .module = THIS_MODULE, |
| }, { |
| .name = "rfc4309", |
| .create = crypto_rfc4309_create, |
| .module = THIS_MODULE, |
| }, |
| }; |
| |
| static int __init crypto_ccm_module_init(void) |
| { |
| return crypto_register_templates(crypto_ccm_tmpls, |
| ARRAY_SIZE(crypto_ccm_tmpls)); |
| } |
| |
| static void __exit crypto_ccm_module_exit(void) |
| { |
| crypto_unregister_templates(crypto_ccm_tmpls, |
| ARRAY_SIZE(crypto_ccm_tmpls)); |
| } |
| |
| module_init(crypto_ccm_module_init); |
| module_exit(crypto_ccm_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Counter with CBC MAC"); |
| MODULE_ALIAS_CRYPTO("ccm_base"); |
| MODULE_ALIAS_CRYPTO("rfc4309"); |
| MODULE_ALIAS_CRYPTO("ccm"); |