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crypto/ccm.c
24.6 KB
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * CCM: Counter with CBC-MAC * * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> |
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*/ #include <crypto/internal/aead.h> |
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#include <crypto/internal/hash.h> |
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#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; |
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struct crypto_ahash_spawn mac; |
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}; struct crypto_ccm_ctx { |
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struct crypto_ahash *mac; |
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struct crypto_skcipher *ctr; |
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}; struct crypto_rfc4309_ctx { struct crypto_aead *child; u8 nonce[3]; }; |
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struct crypto_rfc4309_req_ctx { struct scatterlist src[3]; struct scatterlist dst[3]; struct aead_request subreq; }; |
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struct crypto_ccm_req_priv_ctx { u8 odata[16]; |
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u8 idata[16]; |
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u8 auth_tag[16]; |
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u32 flags; |
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struct scatterlist src[3]; struct scatterlist dst[3]; |
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union { struct ahash_request ahreq; struct skcipher_request skreq; }; |
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}; |
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struct cbcmac_tfm_ctx { struct crypto_cipher *child; }; struct cbcmac_desc_ctx { unsigned int len; |
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}; |
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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); |
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struct crypto_skcipher *ctr = ctx->ctr; |
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struct crypto_ahash *mac = ctx->mac; |
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int err = 0; |
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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) & |
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CRYPTO_TFM_RES_MASK); if (err) goto out; |
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crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK); crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) & |
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CRYPTO_TFM_REQ_MASK); |
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err = crypto_ahash_setkey(mac, key, keylen); crypto_aead_set_flags(aead, crypto_ahash_get_flags(mac) & |
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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; } |
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static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain, unsigned int cryptlen) { |
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struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
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struct crypto_aead *aead = crypto_aead_reqtfm(req); struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
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struct ahash_request *ahreq = &pctx->ahreq; |
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unsigned int assoclen = req->assoclen; |
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struct scatterlist sg[3]; |
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u8 *odata = pctx->odata; u8 *idata = pctx->idata; |
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int ilen, err; |
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/* format control data for input */ err = format_input(odata, req, cryptlen); if (err) goto out; |
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sg_init_table(sg, 3); sg_set_buf(&sg[0], odata, 16); |
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/* format associated data and compute into mac */ if (assoclen) { |
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ilen = format_adata(idata, assoclen); sg_set_buf(&sg[1], idata, ilen); sg_chain(sg, 3, req->src); |
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} else { |
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ilen = 0; sg_chain(sg, 2, req->src); |
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} |
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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; |
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|
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/* 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); |
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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) |
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scatterwalk_map_and_copy(odata, req->dst, req->assoclen + req->cryptlen, |
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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; } |
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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; } |
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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); |
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struct skcipher_request *skreq = &pctx->skreq; |
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struct scatterlist *dst; unsigned int cryptlen = req->cryptlen; u8 *odata = pctx->odata; u8 *iv = req->iv; int err; |
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err = crypto_ccm_init_crypt(req, odata); |
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if (err) return err; |
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err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen); |
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if (err) return err; |
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dst = pctx->src; |
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if (req->src != req->dst) |
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dst = pctx->dst; |
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|
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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); |
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if (err) return err; /* copy authtag to end of dst */ |
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scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen, |
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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; |
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struct scatterlist *dst; pctx->flags = 0; dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
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if (!err) { |
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err = crypto_ccm_auth(req, dst, cryptlen); |
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if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize)) |
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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); |
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struct skcipher_request *skreq = &pctx->skreq; |
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struct scatterlist *dst; unsigned int authsize = crypto_aead_authsize(aead); unsigned int cryptlen = req->cryptlen; u8 *authtag = pctx->auth_tag; u8 *odata = pctx->odata; |
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u8 *iv = pctx->idata; |
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int err; |
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cryptlen -= authsize; |
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err = crypto_ccm_init_crypt(req, authtag); |
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if (err) return err; |
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scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen, authsize, 0); |
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dst = pctx->src; |
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if (req->src != req->dst) |
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dst = pctx->dst; |
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|
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memcpy(iv, req->iv, 16); |
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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); |
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if (err) return err; |
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err = crypto_ccm_auth(req, sg_next(dst), cryptlen); |
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if (err) return err; /* verify */ |
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if (crypto_memneq(authtag, odata, authsize)) |
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return -EBADMSG; return err; } |
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static int crypto_ccm_init_tfm(struct crypto_aead *tfm) |
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{ |
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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); |
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struct crypto_ahash *mac; |
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struct crypto_skcipher *ctr; |
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unsigned long align; int err; |
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mac = crypto_spawn_ahash(&ictx->mac); if (IS_ERR(mac)) return PTR_ERR(mac); |
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ctr = crypto_spawn_skcipher(&ictx->ctr); |
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err = PTR_ERR(ctr); if (IS_ERR(ctr)) |
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goto err_free_mac; |
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ctx->mac = mac; |
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ctx->ctr = ctr; |
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align = crypto_aead_alignmask(tfm); |
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align &= ~(crypto_tfm_ctx_alignment() - 1); |
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crypto_aead_set_reqsize( tfm, |
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align + sizeof(struct crypto_ccm_req_priv_ctx) + |
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max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr))); |
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return 0; |
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err_free_mac: crypto_free_ahash(mac); |
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return err; } |
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static void crypto_ccm_exit_tfm(struct crypto_aead *tfm) |
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{ |
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struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); |
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|
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crypto_free_ahash(ctx->mac); |
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crypto_free_skcipher(ctx->ctr); |
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} |
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static void crypto_ccm_free(struct aead_instance *inst) { struct ccm_instance_ctx *ctx = aead_instance_ctx(inst); |
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crypto_drop_ahash(&ctx->mac); |
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crypto_drop_skcipher(&ctx->ctr); kfree(inst); } static int crypto_ccm_create_common(struct crypto_template *tmpl, struct rtattr **tb, |
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const char *ctr_name, |
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const char *mac_name) |
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{ struct crypto_attr_type *algt; |
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struct aead_instance *inst; |
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struct skcipher_alg *ctr; |
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struct crypto_alg *mac_alg; struct hash_alg_common *mac; |
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struct ccm_instance_ctx *ictx; int err; algt = crypto_get_attr_type(tb); |
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if (IS_ERR(algt)) |
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return PTR_ERR(algt); |
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|
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if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
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return -EINVAL; |
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|
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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); |
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|
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mac = __crypto_hash_alg_common(mac_alg); |
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err = -EINVAL; |
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if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 || mac->digestsize != 16) |
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goto out_put_mac; |
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inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); err = -ENOMEM; if (!inst) |
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goto out_put_mac; |
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|
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ictx = aead_instance_ctx(inst); |
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err = crypto_init_ahash_spawn(&ictx->mac, mac, aead_crypto_instance(inst)); |
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if (err) goto err_free_inst; |
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crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst)); |
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err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0, crypto_requires_sync(algt->type, algt->mask)); |
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if (err) |
f15f05b0a crypto: ccm - swi... |
476 |
goto err_drop_mac; |
4a49b499d [CRYPTO] ccm: Add... |
477 |
|
464b93a3c crypto: ccm - Use... |
478 |
ctr = crypto_spawn_skcipher_alg(&ictx->ctr); |
4a49b499d [CRYPTO] ccm: Add... |
479 |
|
6a1faa4a4 crypto: ccm - fix... |
480 |
/* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ |
4a49b499d [CRYPTO] ccm: Add... |
481 |
err = -EINVAL; |
6a1faa4a4 crypto: ccm - fix... |
482 483 484 |
if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || crypto_skcipher_alg_ivsize(ctr) != 16 || ctr->base.cra_blocksize != 1) |
4a49b499d [CRYPTO] ccm: Add... |
485 |
goto err_drop_ctr; |
6a1faa4a4 crypto: ccm - fix... |
486 487 |
/* ctr and cbcmac must use the same underlying block cipher. */ if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0) |
4a49b499d [CRYPTO] ccm: Add... |
488 489 490 |
goto err_drop_ctr; err = -ENAMETOOLONG; |
6a1faa4a4 crypto: ccm - fix... |
491 492 493 |
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) goto err_drop_ctr; |
81c4c35eb crypto: ccm - Con... |
494 |
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
464b93a3c crypto: ccm - Use... |
495 |
"ccm_base(%s,%s)", ctr->base.cra_driver_name, |
f15f05b0a crypto: ccm - swi... |
496 |
mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
4a49b499d [CRYPTO] ccm: Add... |
497 |
goto err_drop_ctr; |
464b93a3c crypto: ccm - Use... |
498 |
inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC; |
f15f05b0a crypto: ccm - swi... |
499 |
inst->alg.base.cra_priority = (mac->base.cra_priority + |
464b93a3c crypto: ccm - Use... |
500 |
ctr->base.cra_priority) / 2; |
81c4c35eb crypto: ccm - Con... |
501 |
inst->alg.base.cra_blocksize = 1; |
f15f05b0a crypto: ccm - swi... |
502 |
inst->alg.base.cra_alignmask = mac->base.cra_alignmask | |
5ba8e2a05 crypto: ccm - dro... |
503 |
ctr->base.cra_alignmask; |
81c4c35eb crypto: ccm - Con... |
504 |
inst->alg.ivsize = 16; |
464b93a3c crypto: ccm - Use... |
505 |
inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); |
81c4c35eb crypto: ccm - Con... |
506 507 508 509 510 511 512 513 514 515 516 517 518 519 |
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; |
4a49b499d [CRYPTO] ccm: Add... |
520 |
|
f15f05b0a crypto: ccm - swi... |
521 522 |
out_put_mac: crypto_mod_put(mac_alg); |
81c4c35eb crypto: ccm - Con... |
523 |
return err; |
4a49b499d [CRYPTO] ccm: Add... |
524 525 526 |
err_drop_ctr: crypto_drop_skcipher(&ictx->ctr); |
f15f05b0a crypto: ccm - swi... |
527 528 |
err_drop_mac: crypto_drop_ahash(&ictx->mac); |
4a49b499d [CRYPTO] ccm: Add... |
529 530 |
err_free_inst: kfree(inst); |
f15f05b0a crypto: ccm - swi... |
531 |
goto out_put_mac; |
4a49b499d [CRYPTO] ccm: Add... |
532 |
} |
81c4c35eb crypto: ccm - Con... |
533 |
static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb) |
4a49b499d [CRYPTO] ccm: Add... |
534 |
{ |
4a49b499d [CRYPTO] ccm: Add... |
535 536 |
const char *cipher_name; char ctr_name[CRYPTO_MAX_ALG_NAME]; |
f15f05b0a crypto: ccm - swi... |
537 |
char mac_name[CRYPTO_MAX_ALG_NAME]; |
4a49b499d [CRYPTO] ccm: Add... |
538 539 |
cipher_name = crypto_attr_alg_name(tb[1]); |
4a49b499d [CRYPTO] ccm: Add... |
540 |
if (IS_ERR(cipher_name)) |
81c4c35eb crypto: ccm - Con... |
541 |
return PTR_ERR(cipher_name); |
4a49b499d [CRYPTO] ccm: Add... |
542 543 544 |
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= CRYPTO_MAX_ALG_NAME) |
81c4c35eb crypto: ccm - Con... |
545 |
return -ENAMETOOLONG; |
4a49b499d [CRYPTO] ccm: Add... |
546 |
|
f15f05b0a crypto: ccm - swi... |
547 548 549 |
if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)", cipher_name) >= CRYPTO_MAX_ALG_NAME) return -ENAMETOOLONG; |
6a1faa4a4 crypto: ccm - fix... |
550 |
return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); |
4a49b499d [CRYPTO] ccm: Add... |
551 |
} |
81c4c35eb crypto: ccm - Con... |
552 553 |
static int crypto_ccm_base_create(struct crypto_template *tmpl, struct rtattr **tb) |
4a49b499d [CRYPTO] ccm: Add... |
554 |
{ |
4a49b499d [CRYPTO] ccm: Add... |
555 |
const char *ctr_name; |
6a1faa4a4 crypto: ccm - fix... |
556 |
const char *mac_name; |
4a49b499d [CRYPTO] ccm: Add... |
557 558 |
ctr_name = crypto_attr_alg_name(tb[1]); |
4a49b499d [CRYPTO] ccm: Add... |
559 |
if (IS_ERR(ctr_name)) |
81c4c35eb crypto: ccm - Con... |
560 |
return PTR_ERR(ctr_name); |
4a49b499d [CRYPTO] ccm: Add... |
561 |
|
6a1faa4a4 crypto: ccm - fix... |
562 563 564 |
mac_name = crypto_attr_alg_name(tb[2]); if (IS_ERR(mac_name)) return PTR_ERR(mac_name); |
4a49b499d [CRYPTO] ccm: Add... |
565 |
|
6a1faa4a4 crypto: ccm - fix... |
566 |
return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); |
4a49b499d [CRYPTO] ccm: Add... |
567 |
} |
4a49b499d [CRYPTO] ccm: Add... |
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 |
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) { |
81c4c35eb crypto: ccm - Con... |
610 611 |
struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req); struct aead_request *subreq = &rctx->subreq; |
4a49b499d [CRYPTO] ccm: Add... |
612 613 614 |
struct crypto_aead *aead = crypto_aead_reqtfm(req); struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead); struct crypto_aead *child = ctx->child; |
81c4c35eb crypto: ccm - Con... |
615 |
struct scatterlist *sg; |
4a49b499d [CRYPTO] ccm: Add... |
616 617 618 619 620 621 622 623 |
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); |
81c4c35eb crypto: ccm - Con... |
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 |
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); } |
4a49b499d [CRYPTO] ccm: Add... |
639 640 641 |
aead_request_set_tfm(subreq, child); aead_request_set_callback(subreq, req->base.flags, req->base.complete, req->base.data); |
81c4c35eb crypto: ccm - Con... |
642 643 644 645 |
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); |
4a49b499d [CRYPTO] ccm: Add... |
646 647 648 649 650 651 |
return subreq; } static int crypto_rfc4309_encrypt(struct aead_request *req) { |
81c4c35eb crypto: ccm - Con... |
652 653 |
if (req->assoclen != 16 && req->assoclen != 20) return -EINVAL; |
4a49b499d [CRYPTO] ccm: Add... |
654 655 656 657 658 659 660 |
req = crypto_rfc4309_crypt(req); return crypto_aead_encrypt(req); } static int crypto_rfc4309_decrypt(struct aead_request *req) { |
81c4c35eb crypto: ccm - Con... |
661 662 |
if (req->assoclen != 16 && req->assoclen != 20) return -EINVAL; |
4a49b499d [CRYPTO] ccm: Add... |
663 664 665 666 |
req = crypto_rfc4309_crypt(req); return crypto_aead_decrypt(req); } |
81c4c35eb crypto: ccm - Con... |
667 |
static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm) |
4a49b499d [CRYPTO] ccm: Add... |
668 |
{ |
81c4c35eb crypto: ccm - Con... |
669 670 671 |
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); |
4a49b499d [CRYPTO] ccm: Add... |
672 673 674 675 676 677 678 679 680 681 682 |
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); |
81c4c35eb crypto: ccm - Con... |
683 684 685 |
crypto_aead_set_reqsize( tfm, sizeof(struct crypto_rfc4309_req_ctx) + |
2c221ad39 crypto: ccm - Use... |
686 |
ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
81c4c35eb crypto: ccm - Con... |
687 |
align + 32); |
4a49b499d [CRYPTO] ccm: Add... |
688 689 690 |
return 0; } |
81c4c35eb crypto: ccm - Con... |
691 |
static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm) |
4a49b499d [CRYPTO] ccm: Add... |
692 |
{ |
81c4c35eb crypto: ccm - Con... |
693 |
struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); |
4a49b499d [CRYPTO] ccm: Add... |
694 695 696 |
crypto_free_aead(ctx->child); } |
81c4c35eb crypto: ccm - Con... |
697 698 699 700 701 702 703 704 |
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) |
4a49b499d [CRYPTO] ccm: Add... |
705 706 |
{ struct crypto_attr_type *algt; |
81c4c35eb crypto: ccm - Con... |
707 |
struct aead_instance *inst; |
4a49b499d [CRYPTO] ccm: Add... |
708 |
struct crypto_aead_spawn *spawn; |
81c4c35eb crypto: ccm - Con... |
709 |
struct aead_alg *alg; |
4a49b499d [CRYPTO] ccm: Add... |
710 711 712 713 |
const char *ccm_name; int err; algt = crypto_get_attr_type(tb); |
4a49b499d [CRYPTO] ccm: Add... |
714 |
if (IS_ERR(algt)) |
81c4c35eb crypto: ccm - Con... |
715 |
return PTR_ERR(algt); |
4a49b499d [CRYPTO] ccm: Add... |
716 |
|
5e4b8c1fc crypto: aead - Re... |
717 |
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
81c4c35eb crypto: ccm - Con... |
718 |
return -EINVAL; |
4a49b499d [CRYPTO] ccm: Add... |
719 720 |
ccm_name = crypto_attr_alg_name(tb[1]); |
4a49b499d [CRYPTO] ccm: Add... |
721 |
if (IS_ERR(ccm_name)) |
81c4c35eb crypto: ccm - Con... |
722 |
return PTR_ERR(ccm_name); |
4a49b499d [CRYPTO] ccm: Add... |
723 724 725 |
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) |
81c4c35eb crypto: ccm - Con... |
726 |
return -ENOMEM; |
4a49b499d [CRYPTO] ccm: Add... |
727 |
|
81c4c35eb crypto: ccm - Con... |
728 729 |
spawn = aead_instance_ctx(inst); crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
4a49b499d [CRYPTO] ccm: Add... |
730 731 732 733 |
err = crypto_grab_aead(spawn, ccm_name, 0, crypto_requires_sync(algt->type, algt->mask)); if (err) goto out_free_inst; |
81c4c35eb crypto: ccm - Con... |
734 |
alg = crypto_spawn_aead_alg(spawn); |
4a49b499d [CRYPTO] ccm: Add... |
735 736 737 738 |
err = -EINVAL; /* We only support 16-byte blocks. */ |
81c4c35eb crypto: ccm - Con... |
739 |
if (crypto_aead_alg_ivsize(alg) != 16) |
4a49b499d [CRYPTO] ccm: Add... |
740 741 742 |
goto out_drop_alg; /* Not a stream cipher? */ |
81c4c35eb crypto: ccm - Con... |
743 |
if (alg->base.cra_blocksize != 1) |
4a49b499d [CRYPTO] ccm: Add... |
744 745 746 |
goto out_drop_alg; err = -ENAMETOOLONG; |
81c4c35eb crypto: ccm - Con... |
747 748 749 750 751 |
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) >= |
4a49b499d [CRYPTO] ccm: Add... |
752 753 |
CRYPTO_MAX_ALG_NAME) goto out_drop_alg; |
81c4c35eb crypto: ccm - Con... |
754 |
inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
81c4c35eb crypto: ccm - Con... |
755 756 757 |
inst->alg.base.cra_priority = alg->base.cra_priority; inst->alg.base.cra_blocksize = 1; inst->alg.base.cra_alignmask = alg->base.cra_alignmask; |
4a49b499d [CRYPTO] ccm: Add... |
758 |
|
81c4c35eb crypto: ccm - Con... |
759 |
inst->alg.ivsize = 8; |
464b93a3c crypto: ccm - Use... |
760 |
inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
81c4c35eb crypto: ccm - Con... |
761 |
inst->alg.maxauthsize = 16; |
4a49b499d [CRYPTO] ccm: Add... |
762 |
|
81c4c35eb crypto: ccm - Con... |
763 |
inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); |
4a49b499d [CRYPTO] ccm: Add... |
764 |
|
81c4c35eb crypto: ccm - Con... |
765 766 |
inst->alg.init = crypto_rfc4309_init_tfm; inst->alg.exit = crypto_rfc4309_exit_tfm; |
4a49b499d [CRYPTO] ccm: Add... |
767 |
|
81c4c35eb crypto: ccm - Con... |
768 769 770 771 |
inst->alg.setkey = crypto_rfc4309_setkey; inst->alg.setauthsize = crypto_rfc4309_setauthsize; inst->alg.encrypt = crypto_rfc4309_encrypt; inst->alg.decrypt = crypto_rfc4309_decrypt; |
4a49b499d [CRYPTO] ccm: Add... |
772 |
|
81c4c35eb crypto: ccm - Con... |
773 774 775 776 777 |
inst->free = crypto_rfc4309_free; err = aead_register_instance(tmpl, inst); if (err) goto out_drop_alg; |
4a49b499d [CRYPTO] ccm: Add... |
778 779 |
out: |
81c4c35eb crypto: ccm - Con... |
780 |
return err; |
4a49b499d [CRYPTO] ccm: Add... |
781 782 783 784 785 |
out_drop_alg: crypto_drop_aead(spawn); out_free_inst: kfree(inst); |
4a49b499d [CRYPTO] ccm: Add... |
786 787 |
goto out; } |
f15f05b0a crypto: ccm - swi... |
788 789 790 791 792 793 794 795 796 797 798 799 |
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); |
5338ad706 crypto: ccm - hon... |
800 |
u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs; |
f15f05b0a crypto: ccm - swi... |
801 802 |
ctx->len = 0; |
5338ad706 crypto: ccm - hon... |
803 |
memset(dg, 0, bs); |
f15f05b0a crypto: ccm - swi... |
804 805 806 807 808 809 810 811 812 813 814 815 |
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); |
5338ad706 crypto: ccm - hon... |
816 |
u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; |
f15f05b0a crypto: ccm - swi... |
817 818 819 |
while (len > 0) { unsigned int l = min(len, bs - ctx->len); |
5338ad706 crypto: ccm - hon... |
820 |
crypto_xor(dg + ctx->len, p, l); |
f15f05b0a crypto: ccm - swi... |
821 822 823 824 825 |
ctx->len +=l; len -= l; p += l; if (ctx->len == bs) { |
5338ad706 crypto: ccm - hon... |
826 |
crypto_cipher_encrypt_one(tfm, dg, dg); |
f15f05b0a crypto: ccm - swi... |
827 828 829 830 831 832 833 834 835 836 837 838 839 840 |
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); |
5338ad706 crypto: ccm - hon... |
841 |
u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; |
f15f05b0a crypto: ccm - swi... |
842 843 |
if (ctx->len) |
5338ad706 crypto: ccm - hon... |
844 |
crypto_cipher_encrypt_one(tfm, dg, dg); |
f15f05b0a crypto: ccm - swi... |
845 |
|
5338ad706 crypto: ccm - hon... |
846 |
memcpy(out, dg, bs); |
f15f05b0a crypto: ccm - swi... |
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 |
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; |
5338ad706 crypto: ccm - hon... |
902 903 |
inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx), alg->cra_alignmask + 1) + |
f15f05b0a crypto: ccm - swi... |
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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; } |
0db190353 crypto: ccm - use... |
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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, }, |
f15f05b0a crypto: ccm - swi... |
944 |
}; |
4a49b499d [CRYPTO] ccm: Add... |
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static int __init crypto_ccm_module_init(void) { |
0db190353 crypto: ccm - use... |
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return crypto_register_templates(crypto_ccm_tmpls, ARRAY_SIZE(crypto_ccm_tmpls)); |
4a49b499d [CRYPTO] ccm: Add... |
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} static void __exit crypto_ccm_module_exit(void) { |
0db190353 crypto: ccm - use... |
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crypto_unregister_templates(crypto_ccm_tmpls, ARRAY_SIZE(crypto_ccm_tmpls)); |
4a49b499d [CRYPTO] ccm: Add... |
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} |
c4741b230 crypto: run initc... |
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subsys_initcall(crypto_ccm_module_init); |
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module_exit(crypto_ccm_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Counter with CBC MAC"); |
5d26a105b crypto: prefix mo... |
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MODULE_ALIAS_CRYPTO("ccm_base"); MODULE_ALIAS_CRYPTO("rfc4309"); |
4943ba16b crypto: include c... |
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MODULE_ALIAS_CRYPTO("ccm"); |
ae748b9cf wusb: switch to c... |
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MODULE_ALIAS_CRYPTO("cbcmac"); |