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crypto/authenc.c
14.2 KB
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/* * Authenc: Simple AEAD wrapper for IPsec * |
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* Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> |
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* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ |
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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> |
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#include <crypto/authenc.h> |
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#include <crypto/null.h> |
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#include <crypto/scatterwalk.h> |
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#include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/slab.h> #include <linux/spinlock.h> |
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struct authenc_instance_ctx { |
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struct crypto_ahash_spawn auth; |
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struct crypto_skcipher_spawn enc; |
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unsigned int reqoff; |
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}; struct crypto_authenc_ctx { |
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struct crypto_ahash *auth; |
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struct crypto_skcipher *enc; struct crypto_skcipher *null; |
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}; |
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struct authenc_request_ctx { |
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struct scatterlist src[2]; struct scatterlist dst[2]; |
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char tail[]; }; |
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static void authenc_request_complete(struct aead_request *req, int err) { if (err != -EINPROGRESS) aead_request_complete(req, err); } |
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int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, unsigned int keylen) |
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{ |
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struct rtattr *rta = (struct rtattr *)key; |
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struct crypto_authenc_key_param *param; |
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|
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if (!RTA_OK(rta, keylen)) |
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return -EINVAL; |
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if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) |
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return -EINVAL; |
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/* * RTA_OK() didn't align the rtattr's payload when validating that it * fits in the buffer. Yet, the keys should start on the next 4-byte * aligned boundary. To avoid confusion, require that the rtattr * payload be exactly the param struct, which has a 4-byte aligned size. */ if (RTA_PAYLOAD(rta) != sizeof(*param)) |
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return -EINVAL; |
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BUILD_BUG_ON(sizeof(*param) % RTA_ALIGNTO); |
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param = RTA_DATA(rta); |
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keys->enckeylen = be32_to_cpu(param->enckeylen); |
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key += rta->rta_len; keylen -= rta->rta_len; |
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if (keylen < keys->enckeylen) return -EINVAL; keys->authkeylen = keylen - keys->enckeylen; keys->authkey = key; keys->enckey = key + keys->authkeylen; |
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return 0; } EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys); static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, unsigned int keylen) { struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); struct crypto_ahash *auth = ctx->auth; |
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struct crypto_skcipher *enc = ctx->enc; |
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struct crypto_authenc_keys keys; int err = -EINVAL; if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) goto badkey; |
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crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & |
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CRYPTO_TFM_REQ_MASK); |
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err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
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crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & |
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CRYPTO_TFM_RES_MASK); if (err) goto out; |
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crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc) & CRYPTO_TFM_REQ_MASK); err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen); crypto_aead_set_flags(authenc, crypto_skcipher_get_flags(enc) & |
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CRYPTO_TFM_RES_MASK); out: |
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memzero_explicit(&keys, sizeof(keys)); |
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return err; |
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badkey: crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); goto out; |
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} |
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static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err) { struct aead_request *req = areq->data; struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
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struct aead_instance *inst = aead_alg_instance(authenc); struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
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if (err) goto out; |
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scatterwalk_map_and_copy(ahreq->result, req->dst, req->assoclen + req->cryptlen, |
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crypto_aead_authsize(authenc), 1); out: aead_request_complete(req, err); } |
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static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags) |
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{ struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
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struct aead_instance *inst = aead_alg_instance(authenc); |
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
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struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
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struct crypto_ahash *auth = ctx->auth; struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
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u8 *hash = areq_ctx->tail; int err; |
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hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), crypto_ahash_alignmask(auth) + 1); ahash_request_set_tfm(ahreq, auth); |
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ahash_request_set_crypt(ahreq, req->dst, hash, req->assoclen + req->cryptlen); ahash_request_set_callback(ahreq, flags, authenc_geniv_ahash_done, req); |
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err = crypto_ahash_digest(ahreq); |
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if (err) |
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return err; |
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scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen, |
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crypto_aead_authsize(authenc), 1); |
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return 0; } static void crypto_authenc_encrypt_done(struct crypto_async_request *req, int err) { |
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struct aead_request *areq = req->data; |
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if (err) goto out; |
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err = crypto_authenc_genicv(areq, 0); |
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out: |
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authenc_request_complete(areq, err); |
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} |
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static int crypto_authenc_copy_assoc(struct aead_request *req) { struct crypto_aead *authenc = crypto_aead_reqtfm(req); struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
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SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null); |
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skcipher_request_set_tfm(skreq, ctx->null); skcipher_request_set_callback(skreq, aead_request_flags(req), NULL, NULL); skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen, NULL); return crypto_skcipher_encrypt(skreq); |
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} |
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static int crypto_authenc_encrypt(struct aead_request *req) { struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
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struct aead_instance *inst = aead_alg_instance(authenc); |
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
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struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct crypto_skcipher *enc = ctx->enc; |
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unsigned int cryptlen = req->cryptlen; |
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struct skcipher_request *skreq = (void *)(areq_ctx->tail + ictx->reqoff); |
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struct scatterlist *src, *dst; |
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int err; |
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src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen); dst = src; if (req->src != req->dst) { err = crypto_authenc_copy_assoc(req); if (err) return err; |
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dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); } |
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skcipher_request_set_tfm(skreq, enc); skcipher_request_set_callback(skreq, aead_request_flags(req), crypto_authenc_encrypt_done, req); skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv); |
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err = crypto_skcipher_encrypt(skreq); |
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if (err) return err; |
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return crypto_authenc_genicv(req, aead_request_flags(req)); |
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} |
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static int crypto_authenc_decrypt_tail(struct aead_request *req, unsigned int flags) |
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{ |
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struct crypto_aead *authenc = crypto_aead_reqtfm(req); struct aead_instance *inst = aead_alg_instance(authenc); struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
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struct skcipher_request *skreq = (void *)(areq_ctx->tail + ictx->reqoff); |
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unsigned int authsize = crypto_aead_authsize(authenc); u8 *ihash = ahreq->result + authsize; struct scatterlist *src, *dst; |
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scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0); |
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if (crypto_memneq(ihash, ahreq->result, authsize)) return -EBADMSG; |
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src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen); dst = src; |
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if (req->src != req->dst) |
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dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); |
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skcipher_request_set_tfm(skreq, ctx->enc); skcipher_request_set_callback(skreq, aead_request_flags(req), req->base.complete, req->base.data); skcipher_request_set_crypt(skreq, src, dst, req->cryptlen - authsize, req->iv); |
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return crypto_skcipher_decrypt(skreq); |
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} |
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static void authenc_verify_ahash_done(struct crypto_async_request *areq, int err) |
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{ |
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struct aead_request *req = areq->data; |
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if (err) goto out; |
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err = crypto_authenc_decrypt_tail(req, 0); |
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out: authenc_request_complete(req, err); |
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} static int crypto_authenc_decrypt(struct aead_request *req) { struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
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unsigned int authsize = crypto_aead_authsize(authenc); |
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struct aead_instance *inst = aead_alg_instance(authenc); struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); struct crypto_ahash *auth = ctx->auth; struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); u8 *hash = areq_ctx->tail; |
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int err; |
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hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), crypto_ahash_alignmask(auth) + 1); |
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ahash_request_set_tfm(ahreq, auth); ahash_request_set_crypt(ahreq, req->src, hash, req->assoclen + req->cryptlen - authsize); ahash_request_set_callback(ahreq, aead_request_flags(req), authenc_verify_ahash_done, req); err = crypto_ahash_digest(ahreq); |
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if (err) return err; |
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return crypto_authenc_decrypt_tail(req, aead_request_flags(req)); |
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} |
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static int crypto_authenc_init_tfm(struct crypto_aead *tfm) |
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{ |
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struct aead_instance *inst = aead_alg_instance(tfm); struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm); |
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struct crypto_ahash *auth; |
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struct crypto_skcipher *enc; struct crypto_skcipher *null; |
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int err; |
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auth = crypto_spawn_ahash(&ictx->auth); |
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if (IS_ERR(auth)) return PTR_ERR(auth); |
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enc = crypto_spawn_skcipher(&ictx->enc); |
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err = PTR_ERR(enc); if (IS_ERR(enc)) |
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goto err_free_ahash; |
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null = crypto_get_default_null_skcipher2(); |
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err = PTR_ERR(null); if (IS_ERR(null)) goto err_free_skcipher; |
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ctx->auth = auth; ctx->enc = enc; |
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ctx->null = null; |
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crypto_aead_set_reqsize( tfm, |
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sizeof(struct authenc_request_ctx) + |
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ictx->reqoff + |
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max_t(unsigned int, |
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crypto_ahash_reqsize(auth) + sizeof(struct ahash_request), |
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sizeof(struct skcipher_request) + crypto_skcipher_reqsize(enc))); |
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return 0; |
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err_free_skcipher: |
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crypto_free_skcipher(enc); |
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err_free_ahash: crypto_free_ahash(auth); |
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return err; } |
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static void crypto_authenc_exit_tfm(struct crypto_aead *tfm) |
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{ |
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm); |
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347 |
crypto_free_ahash(ctx->auth); |
7217d49f1 crypto: authenc -... |
348 349 |
crypto_free_skcipher(ctx->enc); crypto_put_default_null_skcipher2(); |
3c09f17c3 [CRYPTO] aead: Ad... |
350 |
} |
92d95ba91 crypto: authenc -... |
351 352 353 354 355 356 357 358 359 360 361 |
static void crypto_authenc_free(struct aead_instance *inst) { struct authenc_instance_ctx *ctx = aead_instance_ctx(inst); crypto_drop_skcipher(&ctx->enc); crypto_drop_ahash(&ctx->auth); kfree(inst); } static int crypto_authenc_create(struct crypto_template *tmpl, struct rtattr **tb) |
3c09f17c3 [CRYPTO] aead: Ad... |
362 |
{ |
9ffde35a8 [CRYPTO] authenc:... |
363 |
struct crypto_attr_type *algt; |
92d95ba91 crypto: authenc -... |
364 |
struct aead_instance *inst; |
cbdcf80d8 crypto: authenc -... |
365 366 |
struct hash_alg_common *auth; struct crypto_alg *auth_base; |
7217d49f1 crypto: authenc -... |
367 |
struct skcipher_alg *enc; |
3c09f17c3 [CRYPTO] aead: Ad... |
368 |
struct authenc_instance_ctx *ctx; |
9ffde35a8 [CRYPTO] authenc:... |
369 |
const char *enc_name; |
3c09f17c3 [CRYPTO] aead: Ad... |
370 |
int err; |
9ffde35a8 [CRYPTO] authenc:... |
371 |
algt = crypto_get_attr_type(tb); |
9ffde35a8 [CRYPTO] authenc:... |
372 |
if (IS_ERR(algt)) |
92d95ba91 crypto: authenc -... |
373 |
return PTR_ERR(algt); |
3c09f17c3 [CRYPTO] aead: Ad... |
374 |
|
5e4b8c1fc crypto: aead - Re... |
375 |
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
92d95ba91 crypto: authenc -... |
376 |
return -EINVAL; |
9ffde35a8 [CRYPTO] authenc:... |
377 |
|
cbdcf80d8 crypto: authenc -... |
378 |
auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
927ef32dc crypto: authenc -... |
379 380 |
CRYPTO_ALG_TYPE_AHASH_MASK | crypto_requires_sync(algt->type, algt->mask)); |
3c09f17c3 [CRYPTO] aead: Ad... |
381 |
if (IS_ERR(auth)) |
92d95ba91 crypto: authenc -... |
382 |
return PTR_ERR(auth); |
3c09f17c3 [CRYPTO] aead: Ad... |
383 |
|
cbdcf80d8 crypto: authenc -... |
384 |
auth_base = &auth->base; |
9ffde35a8 [CRYPTO] authenc:... |
385 386 387 |
enc_name = crypto_attr_alg_name(tb[2]); err = PTR_ERR(enc_name); if (IS_ERR(enc_name)) |
3c09f17c3 [CRYPTO] aead: Ad... |
388 |
goto out_put_auth; |
3c09f17c3 [CRYPTO] aead: Ad... |
389 390 391 |
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); err = -ENOMEM; if (!inst) |
9ffde35a8 [CRYPTO] authenc:... |
392 |
goto out_put_auth; |
3c09f17c3 [CRYPTO] aead: Ad... |
393 |
|
92d95ba91 crypto: authenc -... |
394 |
ctx = aead_instance_ctx(inst); |
3c09f17c3 [CRYPTO] aead: Ad... |
395 |
|
92d95ba91 crypto: authenc -... |
396 397 |
err = crypto_init_ahash_spawn(&ctx->auth, auth, aead_crypto_instance(inst)); |
3c09f17c3 [CRYPTO] aead: Ad... |
398 399 |
if (err) goto err_free_inst; |
92d95ba91 crypto: authenc -... |
400 |
crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst)); |
a35528eca crypto: skcipher ... |
401 402 403 |
err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, crypto_requires_sync(algt->type, algt->mask)); |
3c09f17c3 [CRYPTO] aead: Ad... |
404 405 |
if (err) goto err_drop_auth; |
7217d49f1 crypto: authenc -... |
406 |
enc = crypto_spawn_skcipher_alg(&ctx->enc); |
9ffde35a8 [CRYPTO] authenc:... |
407 |
|
92d95ba91 crypto: authenc -... |
408 409 |
ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask, auth_base->cra_alignmask + 1); |
9ffde35a8 [CRYPTO] authenc:... |
410 |
err = -ENAMETOOLONG; |
92d95ba91 crypto: authenc -... |
411 |
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
7217d49f1 crypto: authenc -... |
412 413 |
"authenc(%s,%s)", auth_base->cra_name, enc->base.cra_name) >= |
9ffde35a8 [CRYPTO] authenc:... |
414 415 |
CRYPTO_MAX_ALG_NAME) goto err_drop_enc; |
92d95ba91 crypto: authenc -... |
416 |
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
cbdcf80d8 crypto: authenc -... |
417 |
"authenc(%s,%s)", auth_base->cra_driver_name, |
7217d49f1 crypto: authenc -... |
418 |
enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
9ffde35a8 [CRYPTO] authenc:... |
419 |
goto err_drop_enc; |
7217d49f1 crypto: authenc -... |
420 421 422 |
inst->alg.base.cra_flags = (auth_base->cra_flags | enc->base.cra_flags) & CRYPTO_ALG_ASYNC; inst->alg.base.cra_priority = enc->base.cra_priority * 10 + |
92d95ba91 crypto: authenc -... |
423 |
auth_base->cra_priority; |
7217d49f1 crypto: authenc -... |
424 |
inst->alg.base.cra_blocksize = enc->base.cra_blocksize; |
92d95ba91 crypto: authenc -... |
425 |
inst->alg.base.cra_alignmask = auth_base->cra_alignmask | |
7217d49f1 crypto: authenc -... |
426 |
enc->base.cra_alignmask; |
92d95ba91 crypto: authenc -... |
427 |
inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_ctx); |
7217d49f1 crypto: authenc -... |
428 429 |
inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc); inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc); |
92d95ba91 crypto: authenc -... |
430 |
inst->alg.maxauthsize = auth->digestsize; |
3c09f17c3 [CRYPTO] aead: Ad... |
431 |
|
92d95ba91 crypto: authenc -... |
432 433 |
inst->alg.init = crypto_authenc_init_tfm; inst->alg.exit = crypto_authenc_exit_tfm; |
3c09f17c3 [CRYPTO] aead: Ad... |
434 |
|
92d95ba91 crypto: authenc -... |
435 436 437 |
inst->alg.setkey = crypto_authenc_setkey; inst->alg.encrypt = crypto_authenc_encrypt; inst->alg.decrypt = crypto_authenc_decrypt; |
3c09f17c3 [CRYPTO] aead: Ad... |
438 |
|
92d95ba91 crypto: authenc -... |
439 |
inst->free = crypto_authenc_free; |
3c09f17c3 [CRYPTO] aead: Ad... |
440 |
|
92d95ba91 crypto: authenc -... |
441 442 443 |
err = aead_register_instance(tmpl, inst); if (err) goto err_drop_enc; |
3c09f17c3 [CRYPTO] aead: Ad... |
444 445 |
out: |
cbdcf80d8 crypto: authenc -... |
446 |
crypto_mod_put(auth_base); |
92d95ba91 crypto: authenc -... |
447 |
return err; |
3c09f17c3 [CRYPTO] aead: Ad... |
448 |
|
9ffde35a8 [CRYPTO] authenc:... |
449 450 |
err_drop_enc: crypto_drop_skcipher(&ctx->enc); |
3c09f17c3 [CRYPTO] aead: Ad... |
451 |
err_drop_auth: |
cbdcf80d8 crypto: authenc -... |
452 |
crypto_drop_ahash(&ctx->auth); |
3c09f17c3 [CRYPTO] aead: Ad... |
453 454 |
err_free_inst: kfree(inst); |
9ffde35a8 [CRYPTO] authenc:... |
455 |
out_put_auth: |
3c09f17c3 [CRYPTO] aead: Ad... |
456 457 |
goto out; } |
3c09f17c3 [CRYPTO] aead: Ad... |
458 459 |
static struct crypto_template crypto_authenc_tmpl = { .name = "authenc", |
92d95ba91 crypto: authenc -... |
460 |
.create = crypto_authenc_create, |
3c09f17c3 [CRYPTO] aead: Ad... |
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 |
.module = THIS_MODULE, }; static int __init crypto_authenc_module_init(void) { return crypto_register_template(&crypto_authenc_tmpl); } static void __exit crypto_authenc_module_exit(void) { crypto_unregister_template(&crypto_authenc_tmpl); } module_init(crypto_authenc_module_init); module_exit(crypto_authenc_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); |
4943ba16b crypto: include c... |
479 |
MODULE_ALIAS_CRYPTO("authenc"); |