// SPDX-License-Identifier: GPL-2.0-or-later/* * CCM: Counter with CBC-MAC * * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> */ #include <crypto/internal/aead.h>#include <crypto/internal/cipher.h>#include <crypto/internal/hash.h>#include <crypto/internal/skcipher.h>#include <crypto/scatterwalk.h>#include <crypto/utils.h>#include <linux/err.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/string.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;}; 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; 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); if (err) return err; crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK); crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) & CRYPTO_TFM_REQ_MASK); return crypto_ahash_setkey(mac, key, keylen);} 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, odata, cryptlen); err = crypto_ahash_finup(ahreq);out: return err;} static void crypto_ccm_encrypt_done(void *data, int err){ struct aead_request *req = 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(void *data, int err){ struct aead_request *req = 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 *ctr_name, const char *mac_name){ struct skcipher_alg_common *ctr; u32 mask; struct aead_instance *inst; struct ccm_instance_ctx *ictx; struct hash_alg_common *mac; int err; err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); if (err) return err; inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); if (!inst) return -ENOMEM; ictx = aead_instance_ctx(inst); err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst), mac_name, 0, mask | CRYPTO_ALG_ASYNC); if (err) goto err_free_inst; mac = crypto_spawn_ahash_alg(&ictx->mac); err = -EINVAL; if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 || mac->digestsize != 16) goto err_free_inst; err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst), ctr_name, 0, mask); if (err) goto err_free_inst; ctr = crypto_spawn_skcipher_alg_common(&ictx->ctr); /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ err = -EINVAL; if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || ctr->ivsize != 16 || ctr->base.cra_blocksize != 1) goto err_free_inst; /* ctr and cbcmac must use the same underlying block cipher. */ if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0) goto err_free_inst; err = -ENAMETOOLONG; if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) goto err_free_inst; 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_free_inst; inst->alg.base.cra_priority = (mac->base.cra_priority +Lines 1–500 of 941. 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// SPDX-License-Identifier: GPL-2.0-or-later /* * CCM: Counter with CBC-MAC * * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> */ #include <crypto/internal/aead.h> #include <crypto/internal/cipher.h> #include <crypto/internal/hash.h> #include <crypto/internal/skcipher.h> #include <crypto/scatterwalk.h> #include <crypto/utils.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/string.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; }; 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; 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); if (err) return err; crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK); crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) & CRYPTO_TFM_REQ_MASK); return crypto_ahash_setkey(mac, key, keylen); } 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, odata, cryptlen); err = crypto_ahash_finup(ahreq); out: return err; } static void crypto_ccm_encrypt_done(void *data, int err) { struct aead_request *req = 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(void *data, int err) { struct aead_request *req = 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 *ctr_name, const char *mac_name) { struct skcipher_alg_common *ctr; u32 mask; struct aead_instance *inst; struct ccm_instance_ctx *ictx; struct hash_alg_common *mac; int err; err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); if (err) return err; inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); if (!inst) return -ENOMEM; ictx = aead_instance_ctx(inst); err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst), mac_name, 0, mask | CRYPTO_ALG_ASYNC); if (err) goto err_free_inst; mac = crypto_spawn_ahash_alg(&ictx->mac); err = -EINVAL; if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 || mac->digestsize != 16) goto err_free_inst; err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst), ctr_name, 0, mask); if (err) goto err_free_inst; ctr = crypto_spawn_skcipher_alg_common(&ictx->ctr); /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ err = -EINVAL; if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || ctr->ivsize != 16 || ctr->base.cra_blocksize != 1) goto err_free_inst; /* ctr and cbcmac must use the same underlying block cipher. */ if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0) goto err_free_inst; err = -ENAMETOOLONG; if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) goto err_free_inst; 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_free_inst; inst->alg.base.cra_priority = (mac->base.cra_priority +