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crypto/ccm.c
23.4 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> |
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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; |
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|
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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); |
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if (err) |
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return err; |
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|
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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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return crypto_ahash_setkey(mac, key, keylen); |
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} 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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|
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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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{ |
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u32 mask; |
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struct aead_instance *inst; |
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struct ccm_instance_ctx *ictx; |
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struct skcipher_alg *ctr; |
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struct hash_alg_common *mac; |
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int err; |
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); if (err) return err; |
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|
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inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); |
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if (!inst) |
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return -ENOMEM; |
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ictx = aead_instance_ctx(inst); |
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err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst), |
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mac_name, 0, mask | CRYPTO_ALG_ASYNC); |
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if (err) goto err_free_inst; |
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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; |
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|
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err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst), ctr_name, 0, mask); |
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if (err) |
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goto err_free_inst; |
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ctr = crypto_spawn_skcipher_alg(&ictx->ctr); |
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|
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/* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ |
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err = -EINVAL; |
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if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || crypto_skcipher_alg_ivsize(ctr) != 16 || ctr->base.cra_blocksize != 1) |
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goto err_free_inst; |
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|
6a1faa4a4 crypto: ccm - fix... |
464 465 |
/* ctr and cbcmac must use the same underlying block cipher. */ if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0) |
05b3bbb53 crypto: ccm - use... |
466 |
goto err_free_inst; |
4a49b499d [CRYPTO] ccm: Add... |
467 468 |
err = -ENAMETOOLONG; |
6a1faa4a4 crypto: ccm - fix... |
469 470 |
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) |
05b3bbb53 crypto: ccm - use... |
471 |
goto err_free_inst; |
6a1faa4a4 crypto: ccm - fix... |
472 |
|
81c4c35eb crypto: ccm - Con... |
473 |
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
464b93a3c crypto: ccm - Use... |
474 |
"ccm_base(%s,%s)", ctr->base.cra_driver_name, |
f15f05b0a crypto: ccm - swi... |
475 |
mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
05b3bbb53 crypto: ccm - use... |
476 |
goto err_free_inst; |
4a49b499d [CRYPTO] ccm: Add... |
477 |
|
f15f05b0a crypto: ccm - swi... |
478 |
inst->alg.base.cra_priority = (mac->base.cra_priority + |
464b93a3c crypto: ccm - Use... |
479 |
ctr->base.cra_priority) / 2; |
81c4c35eb crypto: ccm - Con... |
480 |
inst->alg.base.cra_blocksize = 1; |
f15f05b0a crypto: ccm - swi... |
481 |
inst->alg.base.cra_alignmask = mac->base.cra_alignmask | |
5ba8e2a05 crypto: ccm - dro... |
482 |
ctr->base.cra_alignmask; |
81c4c35eb crypto: ccm - Con... |
483 |
inst->alg.ivsize = 16; |
464b93a3c crypto: ccm - Use... |
484 |
inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); |
81c4c35eb crypto: ccm - Con... |
485 486 487 488 489 490 491 492 493 494 495 496 |
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); |
05b3bbb53 crypto: ccm - use... |
497 |
if (err) { |
4a49b499d [CRYPTO] ccm: Add... |
498 |
err_free_inst: |
05b3bbb53 crypto: ccm - use... |
499 500 501 |
crypto_ccm_free(inst); } return err; |
4a49b499d [CRYPTO] ccm: Add... |
502 |
} |
81c4c35eb crypto: ccm - Con... |
503 |
static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb) |
4a49b499d [CRYPTO] ccm: Add... |
504 |
{ |
4a49b499d [CRYPTO] ccm: Add... |
505 506 |
const char *cipher_name; char ctr_name[CRYPTO_MAX_ALG_NAME]; |
f15f05b0a crypto: ccm - swi... |
507 |
char mac_name[CRYPTO_MAX_ALG_NAME]; |
4a49b499d [CRYPTO] ccm: Add... |
508 509 |
cipher_name = crypto_attr_alg_name(tb[1]); |
4a49b499d [CRYPTO] ccm: Add... |
510 |
if (IS_ERR(cipher_name)) |
81c4c35eb crypto: ccm - Con... |
511 |
return PTR_ERR(cipher_name); |
4a49b499d [CRYPTO] ccm: Add... |
512 513 514 |
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= CRYPTO_MAX_ALG_NAME) |
81c4c35eb crypto: ccm - Con... |
515 |
return -ENAMETOOLONG; |
4a49b499d [CRYPTO] ccm: Add... |
516 |
|
f15f05b0a crypto: ccm - swi... |
517 518 519 |
if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)", cipher_name) >= CRYPTO_MAX_ALG_NAME) return -ENAMETOOLONG; |
6a1faa4a4 crypto: ccm - fix... |
520 |
return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); |
4a49b499d [CRYPTO] ccm: Add... |
521 |
} |
81c4c35eb crypto: ccm - Con... |
522 523 |
static int crypto_ccm_base_create(struct crypto_template *tmpl, struct rtattr **tb) |
4a49b499d [CRYPTO] ccm: Add... |
524 |
{ |
4a49b499d [CRYPTO] ccm: Add... |
525 |
const char *ctr_name; |
6a1faa4a4 crypto: ccm - fix... |
526 |
const char *mac_name; |
4a49b499d [CRYPTO] ccm: Add... |
527 528 |
ctr_name = crypto_attr_alg_name(tb[1]); |
4a49b499d [CRYPTO] ccm: Add... |
529 |
if (IS_ERR(ctr_name)) |
81c4c35eb crypto: ccm - Con... |
530 |
return PTR_ERR(ctr_name); |
4a49b499d [CRYPTO] ccm: Add... |
531 |
|
6a1faa4a4 crypto: ccm - fix... |
532 533 534 |
mac_name = crypto_attr_alg_name(tb[2]); if (IS_ERR(mac_name)) return PTR_ERR(mac_name); |
4a49b499d [CRYPTO] ccm: Add... |
535 |
|
6a1faa4a4 crypto: ccm - fix... |
536 |
return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); |
4a49b499d [CRYPTO] ccm: Add... |
537 |
} |
4a49b499d [CRYPTO] ccm: Add... |
538 539 540 541 542 |
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; |
4a49b499d [CRYPTO] ccm: Add... |
543 544 545 546 547 548 549 550 551 552 |
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); |
af5034e8e crypto: remove pr... |
553 |
return crypto_aead_setkey(child, key, keylen); |
4a49b499d [CRYPTO] ccm: Add... |
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 |
} 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... |
575 576 |
struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req); struct aead_request *subreq = &rctx->subreq; |
4a49b499d [CRYPTO] ccm: Add... |
577 578 579 |
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... |
580 |
struct scatterlist *sg; |
4a49b499d [CRYPTO] ccm: Add... |
581 582 583 584 585 586 587 588 |
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... |
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 |
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... |
604 605 606 |
aead_request_set_tfm(subreq, child); aead_request_set_callback(subreq, req->base.flags, req->base.complete, req->base.data); |
81c4c35eb crypto: ccm - Con... |
607 608 609 610 |
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... |
611 612 613 614 615 616 |
return subreq; } static int crypto_rfc4309_encrypt(struct aead_request *req) { |
81c4c35eb crypto: ccm - Con... |
617 618 |
if (req->assoclen != 16 && req->assoclen != 20) return -EINVAL; |
4a49b499d [CRYPTO] ccm: Add... |
619 620 621 622 623 624 625 |
req = crypto_rfc4309_crypt(req); return crypto_aead_encrypt(req); } static int crypto_rfc4309_decrypt(struct aead_request *req) { |
81c4c35eb crypto: ccm - Con... |
626 627 |
if (req->assoclen != 16 && req->assoclen != 20) return -EINVAL; |
4a49b499d [CRYPTO] ccm: Add... |
628 629 630 631 |
req = crypto_rfc4309_crypt(req); return crypto_aead_decrypt(req); } |
81c4c35eb crypto: ccm - Con... |
632 |
static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm) |
4a49b499d [CRYPTO] ccm: Add... |
633 |
{ |
81c4c35eb crypto: ccm - Con... |
634 635 636 |
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... |
637 638 639 640 641 642 643 644 645 646 647 |
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... |
648 649 650 |
crypto_aead_set_reqsize( tfm, sizeof(struct crypto_rfc4309_req_ctx) + |
2c221ad39 crypto: ccm - Use... |
651 |
ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
81c4c35eb crypto: ccm - Con... |
652 |
align + 32); |
4a49b499d [CRYPTO] ccm: Add... |
653 654 655 |
return 0; } |
81c4c35eb crypto: ccm - Con... |
656 |
static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm) |
4a49b499d [CRYPTO] ccm: Add... |
657 |
{ |
81c4c35eb crypto: ccm - Con... |
658 |
struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); |
4a49b499d [CRYPTO] ccm: Add... |
659 660 661 |
crypto_free_aead(ctx->child); } |
81c4c35eb crypto: ccm - Con... |
662 663 664 665 666 667 668 669 |
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... |
670 |
{ |
cd900f0ca crypto: aead - pa... |
671 |
u32 mask; |
81c4c35eb crypto: ccm - Con... |
672 |
struct aead_instance *inst; |
4a49b499d [CRYPTO] ccm: Add... |
673 |
struct crypto_aead_spawn *spawn; |
81c4c35eb crypto: ccm - Con... |
674 |
struct aead_alg *alg; |
4a49b499d [CRYPTO] ccm: Add... |
675 |
int err; |
7bcb2c99f crypto: algapi - ... |
676 677 678 |
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); if (err) return err; |
cd900f0ca crypto: aead - pa... |
679 |
|
4a49b499d [CRYPTO] ccm: Add... |
680 681 |
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) |
81c4c35eb crypto: ccm - Con... |
682 |
return -ENOMEM; |
4a49b499d [CRYPTO] ccm: Add... |
683 |
|
81c4c35eb crypto: ccm - Con... |
684 |
spawn = aead_instance_ctx(inst); |
cd900f0ca crypto: aead - pa... |
685 |
err = crypto_grab_aead(spawn, aead_crypto_instance(inst), |
64d66793b crypto: ccm - sim... |
686 |
crypto_attr_alg_name(tb[1]), 0, mask); |
4a49b499d [CRYPTO] ccm: Add... |
687 |
if (err) |
64d66793b crypto: ccm - sim... |
688 |
goto err_free_inst; |
4a49b499d [CRYPTO] ccm: Add... |
689 |
|
81c4c35eb crypto: ccm - Con... |
690 |
alg = crypto_spawn_aead_alg(spawn); |
4a49b499d [CRYPTO] ccm: Add... |
691 692 693 694 |
err = -EINVAL; /* We only support 16-byte blocks. */ |
81c4c35eb crypto: ccm - Con... |
695 |
if (crypto_aead_alg_ivsize(alg) != 16) |
64d66793b crypto: ccm - sim... |
696 |
goto err_free_inst; |
4a49b499d [CRYPTO] ccm: Add... |
697 698 |
/* Not a stream cipher? */ |
81c4c35eb crypto: ccm - Con... |
699 |
if (alg->base.cra_blocksize != 1) |
64d66793b crypto: ccm - sim... |
700 |
goto err_free_inst; |
4a49b499d [CRYPTO] ccm: Add... |
701 702 |
err = -ENAMETOOLONG; |
81c4c35eb crypto: ccm - Con... |
703 704 705 706 707 |
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... |
708 |
CRYPTO_MAX_ALG_NAME) |
64d66793b crypto: ccm - sim... |
709 |
goto err_free_inst; |
4a49b499d [CRYPTO] ccm: Add... |
710 |
|
81c4c35eb crypto: ccm - Con... |
711 712 713 |
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... |
714 |
|
81c4c35eb crypto: ccm - Con... |
715 |
inst->alg.ivsize = 8; |
464b93a3c crypto: ccm - Use... |
716 |
inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
81c4c35eb crypto: ccm - Con... |
717 |
inst->alg.maxauthsize = 16; |
4a49b499d [CRYPTO] ccm: Add... |
718 |
|
81c4c35eb crypto: ccm - Con... |
719 |
inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); |
4a49b499d [CRYPTO] ccm: Add... |
720 |
|
81c4c35eb crypto: ccm - Con... |
721 722 |
inst->alg.init = crypto_rfc4309_init_tfm; inst->alg.exit = crypto_rfc4309_exit_tfm; |
4a49b499d [CRYPTO] ccm: Add... |
723 |
|
81c4c35eb crypto: ccm - Con... |
724 725 726 727 |
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... |
728 |
|
81c4c35eb crypto: ccm - Con... |
729 730 731 |
inst->free = crypto_rfc4309_free; err = aead_register_instance(tmpl, inst); |
64d66793b crypto: ccm - sim... |
732 733 734 735 |
if (err) { err_free_inst: crypto_rfc4309_free(inst); } |
81c4c35eb crypto: ccm - Con... |
736 |
return err; |
4a49b499d [CRYPTO] ccm: Add... |
737 |
} |
f15f05b0a crypto: ccm - swi... |
738 739 740 741 742 743 744 745 746 747 748 749 |
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... |
750 |
u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs; |
f15f05b0a crypto: ccm - swi... |
751 752 |
ctx->len = 0; |
5338ad706 crypto: ccm - hon... |
753 |
memset(dg, 0, bs); |
f15f05b0a crypto: ccm - swi... |
754 755 756 757 758 759 760 761 762 763 764 765 |
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... |
766 |
u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; |
f15f05b0a crypto: ccm - swi... |
767 768 769 |
while (len > 0) { unsigned int l = min(len, bs - ctx->len); |
5338ad706 crypto: ccm - hon... |
770 |
crypto_xor(dg + ctx->len, p, l); |
f15f05b0a crypto: ccm - swi... |
771 772 773 774 775 |
ctx->len +=l; len -= l; p += l; if (ctx->len == bs) { |
5338ad706 crypto: ccm - hon... |
776 |
crypto_cipher_encrypt_one(tfm, dg, dg); |
f15f05b0a crypto: ccm - swi... |
777 778 779 780 781 782 783 784 785 786 787 788 789 790 |
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... |
791 |
u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; |
f15f05b0a crypto: ccm - swi... |
792 793 |
if (ctx->len) |
5338ad706 crypto: ccm - hon... |
794 |
crypto_cipher_encrypt_one(tfm, dg, dg); |
f15f05b0a crypto: ccm - swi... |
795 |
|
5338ad706 crypto: ccm - hon... |
796 |
memcpy(out, dg, bs); |
f15f05b0a crypto: ccm - swi... |
797 798 799 800 801 802 803 |
return 0; } static int cbcmac_init_tfm(struct crypto_tfm *tfm) { struct crypto_cipher *cipher; struct crypto_instance *inst = (void *)tfm->__crt_alg; |
d5ed3b65f crypto: cipher - ... |
804 |
struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst); |
f15f05b0a crypto: ccm - swi... |
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 |
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; |
166729709 crypto: cbcmac - ... |
825 |
struct crypto_cipher_spawn *spawn; |
f15f05b0a crypto: ccm - swi... |
826 |
struct crypto_alg *alg; |
7bcb2c99f crypto: algapi - ... |
827 |
u32 mask; |
f15f05b0a crypto: ccm - swi... |
828 |
int err; |
7bcb2c99f crypto: algapi - ... |
829 |
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask); |
f15f05b0a crypto: ccm - swi... |
830 831 |
if (err) return err; |
166729709 crypto: cbcmac - ... |
832 833 834 835 |
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) return -ENOMEM; spawn = shash_instance_ctx(inst); |
f15f05b0a crypto: ccm - swi... |
836 |
|
166729709 crypto: cbcmac - ... |
837 |
err = crypto_grab_cipher(spawn, shash_crypto_instance(inst), |
7bcb2c99f crypto: algapi - ... |
838 |
crypto_attr_alg_name(tb[1]), 0, mask); |
166729709 crypto: cbcmac - ... |
839 840 841 |
if (err) goto err_free_inst; alg = crypto_spawn_cipher_alg(spawn); |
f15f05b0a crypto: ccm - swi... |
842 |
|
166729709 crypto: cbcmac - ... |
843 |
err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg); |
f15f05b0a crypto: ccm - swi... |
844 |
if (err) |
166729709 crypto: cbcmac - ... |
845 |
goto err_free_inst; |
f15f05b0a crypto: ccm - swi... |
846 847 848 849 850 |
inst->alg.base.cra_priority = alg->cra_priority; inst->alg.base.cra_blocksize = 1; inst->alg.digestsize = alg->cra_blocksize; |
5338ad706 crypto: ccm - hon... |
851 852 |
inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx), alg->cra_alignmask + 1) + |
f15f05b0a crypto: ccm - swi... |
853 854 855 856 857 858 859 860 861 862 |
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; |
a39c66cc2 crypto: shash - c... |
863 |
inst->free = shash_free_singlespawn_instance; |
f15f05b0a crypto: ccm - swi... |
864 |
err = shash_register_instance(tmpl, inst); |
166729709 crypto: cbcmac - ... |
865 866 |
if (err) { err_free_inst: |
a39c66cc2 crypto: shash - c... |
867 |
shash_free_singlespawn_instance(inst); |
166729709 crypto: cbcmac - ... |
868 |
} |
f15f05b0a crypto: ccm - swi... |
869 870 |
return err; } |
0db190353 crypto: ccm - use... |
871 872 873 874 |
static struct crypto_template crypto_ccm_tmpls[] = { { .name = "cbcmac", .create = cbcmac_create, |
0db190353 crypto: ccm - use... |
875 876 877 878 879 880 881 882 883 884 885 886 887 888 |
.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... |
889 |
}; |
4a49b499d [CRYPTO] ccm: Add... |
890 891 |
static int __init crypto_ccm_module_init(void) { |
0db190353 crypto: ccm - use... |
892 893 |
return crypto_register_templates(crypto_ccm_tmpls, ARRAY_SIZE(crypto_ccm_tmpls)); |
4a49b499d [CRYPTO] ccm: Add... |
894 895 896 897 |
} static void __exit crypto_ccm_module_exit(void) { |
0db190353 crypto: ccm - use... |
898 899 |
crypto_unregister_templates(crypto_ccm_tmpls, ARRAY_SIZE(crypto_ccm_tmpls)); |
4a49b499d [CRYPTO] ccm: Add... |
900 |
} |
c4741b230 crypto: run initc... |
901 |
subsys_initcall(crypto_ccm_module_init); |
4a49b499d [CRYPTO] ccm: Add... |
902 903 904 905 |
module_exit(crypto_ccm_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Counter with CBC MAC"); |
5d26a105b crypto: prefix mo... |
906 907 |
MODULE_ALIAS_CRYPTO("ccm_base"); MODULE_ALIAS_CRYPTO("rfc4309"); |
4943ba16b crypto: include c... |
908 |
MODULE_ALIAS_CRYPTO("ccm"); |
ae748b9cf wusb: switch to c... |
909 |
MODULE_ALIAS_CRYPTO("cbcmac"); |