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![Mathias Krause](/assets/img/avatar_default.png)
Use the common helper function crypto_authenc_extractkeys() for key parsing. Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Mathias Krause <mathias.krause@secunet.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
816 lines
23 KiB
C
816 lines
23 KiB
C
/*
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* authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
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* derived from authenc.c
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*
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* Copyright (C) 2010 secunet Security Networks AG
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* Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/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/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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struct authenc_esn_instance_ctx {
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struct crypto_ahash_spawn auth;
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struct crypto_skcipher_spawn enc;
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};
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struct crypto_authenc_esn_ctx {
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unsigned int reqoff;
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struct crypto_ahash *auth;
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struct crypto_ablkcipher *enc;
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};
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struct authenc_esn_request_ctx {
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unsigned int cryptlen;
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unsigned int headlen;
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unsigned int trailen;
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struct scatterlist *sg;
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struct scatterlist hsg[2];
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struct scatterlist tsg[1];
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struct scatterlist cipher[2];
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crypto_completion_t complete;
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crypto_completion_t update_complete;
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crypto_completion_t update_complete2;
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char tail[];
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};
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static void authenc_esn_request_complete(struct aead_request *req, int err)
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{
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if (err != -EINPROGRESS)
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aead_request_complete(req, err);
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}
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static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct crypto_ahash *auth = ctx->auth;
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struct crypto_ablkcipher *enc = ctx->enc;
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struct crypto_authenc_keys keys;
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int err = -EINVAL;
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if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
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goto badkey;
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crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
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crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
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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_esn, crypto_ahash_get_flags(auth) &
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CRYPTO_TFM_RES_MASK);
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if (err)
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goto out;
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crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
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crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen);
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crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) &
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CRYPTO_TFM_RES_MASK);
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out:
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return err;
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badkey:
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crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
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goto out;
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}
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static void authenc_esn_geniv_ahash_update_done(struct crypto_async_request *areq,
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int err)
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{
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struct aead_request *req = areq->data;
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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if (err)
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goto out;
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ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
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areq_ctx->cryptlen);
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ahash_request_set_callback(ahreq, aead_request_flags(req) &
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CRYPTO_TFM_REQ_MAY_SLEEP,
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areq_ctx->update_complete2, req);
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err = crypto_ahash_update(ahreq);
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if (err)
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goto out;
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ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
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areq_ctx->trailen);
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ahash_request_set_callback(ahreq, aead_request_flags(req) &
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CRYPTO_TFM_REQ_MAY_SLEEP,
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areq_ctx->complete, req);
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err = crypto_ahash_finup(ahreq);
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if (err)
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goto out;
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scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
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areq_ctx->cryptlen,
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crypto_aead_authsize(authenc_esn), 1);
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out:
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authenc_esn_request_complete(req, err);
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}
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static void authenc_esn_geniv_ahash_update_done2(struct crypto_async_request *areq,
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int err)
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{
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struct aead_request *req = areq->data;
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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if (err)
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goto out;
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ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
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areq_ctx->trailen);
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ahash_request_set_callback(ahreq, aead_request_flags(req) &
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CRYPTO_TFM_REQ_MAY_SLEEP,
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areq_ctx->complete, req);
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err = crypto_ahash_finup(ahreq);
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if (err)
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goto out;
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scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
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areq_ctx->cryptlen,
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crypto_aead_authsize(authenc_esn), 1);
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out:
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authenc_esn_request_complete(req, err);
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}
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static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
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int err)
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{
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struct aead_request *req = areq->data;
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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if (err)
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goto out;
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scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
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areq_ctx->cryptlen,
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crypto_aead_authsize(authenc_esn), 1);
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out:
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aead_request_complete(req, err);
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}
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static void authenc_esn_verify_ahash_update_done(struct crypto_async_request *areq,
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int err)
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{
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u8 *ihash;
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unsigned int authsize;
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struct ablkcipher_request *abreq;
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struct aead_request *req = areq->data;
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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unsigned int cryptlen = req->cryptlen;
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if (err)
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goto out;
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ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
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areq_ctx->cryptlen);
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ahash_request_set_callback(ahreq,
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aead_request_flags(req) &
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CRYPTO_TFM_REQ_MAY_SLEEP,
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areq_ctx->update_complete2, req);
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err = crypto_ahash_update(ahreq);
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if (err)
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goto out;
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ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
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areq_ctx->trailen);
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ahash_request_set_callback(ahreq, aead_request_flags(req) &
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CRYPTO_TFM_REQ_MAY_SLEEP,
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areq_ctx->complete, req);
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err = crypto_ahash_finup(ahreq);
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if (err)
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goto out;
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authsize = crypto_aead_authsize(authenc_esn);
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cryptlen -= authsize;
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ihash = ahreq->result + authsize;
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scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
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authsize, 0);
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err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
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if (err)
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goto out;
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abreq = aead_request_ctx(req);
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ablkcipher_request_set_tfm(abreq, ctx->enc);
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ablkcipher_request_set_callback(abreq, aead_request_flags(req),
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req->base.complete, req->base.data);
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ablkcipher_request_set_crypt(abreq, req->src, req->dst,
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cryptlen, req->iv);
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err = crypto_ablkcipher_decrypt(abreq);
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out:
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authenc_esn_request_complete(req, err);
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}
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static void authenc_esn_verify_ahash_update_done2(struct crypto_async_request *areq,
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int err)
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{
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u8 *ihash;
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unsigned int authsize;
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struct ablkcipher_request *abreq;
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struct aead_request *req = areq->data;
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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unsigned int cryptlen = req->cryptlen;
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if (err)
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goto out;
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ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
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areq_ctx->trailen);
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ahash_request_set_callback(ahreq, aead_request_flags(req) &
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CRYPTO_TFM_REQ_MAY_SLEEP,
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areq_ctx->complete, req);
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err = crypto_ahash_finup(ahreq);
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if (err)
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goto out;
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authsize = crypto_aead_authsize(authenc_esn);
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cryptlen -= authsize;
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ihash = ahreq->result + authsize;
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scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
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authsize, 0);
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err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
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if (err)
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goto out;
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abreq = aead_request_ctx(req);
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ablkcipher_request_set_tfm(abreq, ctx->enc);
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ablkcipher_request_set_callback(abreq, aead_request_flags(req),
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req->base.complete, req->base.data);
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ablkcipher_request_set_crypt(abreq, req->src, req->dst,
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cryptlen, req->iv);
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err = crypto_ablkcipher_decrypt(abreq);
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out:
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authenc_esn_request_complete(req, err);
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}
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static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
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int err)
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{
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u8 *ihash;
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unsigned int authsize;
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struct ablkcipher_request *abreq;
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struct aead_request *req = areq->data;
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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unsigned int cryptlen = req->cryptlen;
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if (err)
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goto out;
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authsize = crypto_aead_authsize(authenc_esn);
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cryptlen -= authsize;
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ihash = ahreq->result + authsize;
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scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
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authsize, 0);
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err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
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if (err)
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goto out;
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abreq = aead_request_ctx(req);
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ablkcipher_request_set_tfm(abreq, ctx->enc);
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ablkcipher_request_set_callback(abreq, aead_request_flags(req),
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req->base.complete, req->base.data);
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ablkcipher_request_set_crypt(abreq, req->src, req->dst,
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cryptlen, req->iv);
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err = crypto_ablkcipher_decrypt(abreq);
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out:
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authenc_esn_request_complete(req, err);
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}
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static u8 *crypto_authenc_esn_ahash(struct aead_request *req,
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unsigned int flags)
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{
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct crypto_ahash *auth = ctx->auth;
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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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),
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crypto_ahash_alignmask(auth) + 1);
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ahash_request_set_tfm(ahreq, auth);
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err = crypto_ahash_init(ahreq);
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if (err)
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return ERR_PTR(err);
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ahash_request_set_crypt(ahreq, areq_ctx->hsg, hash, areq_ctx->headlen);
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ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
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areq_ctx->update_complete, req);
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err = crypto_ahash_update(ahreq);
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if (err)
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return ERR_PTR(err);
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ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, areq_ctx->cryptlen);
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ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
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areq_ctx->update_complete2, req);
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err = crypto_ahash_update(ahreq);
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if (err)
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return ERR_PTR(err);
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ahash_request_set_crypt(ahreq, areq_ctx->tsg, hash,
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areq_ctx->trailen);
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ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
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areq_ctx->complete, req);
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err = crypto_ahash_finup(ahreq);
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if (err)
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return ERR_PTR(err);
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return hash;
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}
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static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv,
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unsigned int flags)
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{
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct scatterlist *dst = req->dst;
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struct scatterlist *assoc = req->assoc;
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struct scatterlist *cipher = areq_ctx->cipher;
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struct scatterlist *hsg = areq_ctx->hsg;
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struct scatterlist *tsg = areq_ctx->tsg;
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struct scatterlist *assoc1;
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struct scatterlist *assoc2;
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unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
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unsigned int cryptlen = req->cryptlen;
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struct page *dstp;
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u8 *vdst;
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u8 *hash;
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dstp = sg_page(dst);
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vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
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if (ivsize) {
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sg_init_table(cipher, 2);
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sg_set_buf(cipher, iv, ivsize);
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scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2);
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dst = cipher;
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cryptlen += ivsize;
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}
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if (sg_is_last(assoc))
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return -EINVAL;
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assoc1 = assoc + 1;
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if (sg_is_last(assoc1))
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return -EINVAL;
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assoc2 = assoc + 2;
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if (!sg_is_last(assoc2))
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return -EINVAL;
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sg_init_table(hsg, 2);
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sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset);
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sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset);
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sg_init_table(tsg, 1);
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sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset);
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areq_ctx->cryptlen = cryptlen;
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areq_ctx->headlen = assoc->length + assoc2->length;
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areq_ctx->trailen = assoc1->length;
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areq_ctx->sg = dst;
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areq_ctx->complete = authenc_esn_geniv_ahash_done;
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areq_ctx->update_complete = authenc_esn_geniv_ahash_update_done;
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areq_ctx->update_complete2 = authenc_esn_geniv_ahash_update_done2;
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hash = crypto_authenc_esn_ahash(req, flags);
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if (IS_ERR(hash))
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return PTR_ERR(hash);
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scatterwalk_map_and_copy(hash, dst, cryptlen,
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crypto_aead_authsize(authenc_esn), 1);
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return 0;
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}
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static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
|
|
int err)
|
|
{
|
|
struct aead_request *areq = req->data;
|
|
|
|
if (!err) {
|
|
struct crypto_aead *authenc_esn = crypto_aead_reqtfm(areq);
|
|
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
|
|
struct ablkcipher_request *abreq = aead_request_ctx(areq);
|
|
u8 *iv = (u8 *)(abreq + 1) +
|
|
crypto_ablkcipher_reqsize(ctx->enc);
|
|
|
|
err = crypto_authenc_esn_genicv(areq, iv, 0);
|
|
}
|
|
|
|
authenc_esn_request_complete(areq, err);
|
|
}
|
|
|
|
static int crypto_authenc_esn_encrypt(struct aead_request *req)
|
|
{
|
|
struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
|
|
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
|
|
struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
|
|
struct crypto_ablkcipher *enc = ctx->enc;
|
|
struct scatterlist *dst = req->dst;
|
|
unsigned int cryptlen = req->cryptlen;
|
|
struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
|
|
+ ctx->reqoff);
|
|
u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
|
|
int err;
|
|
|
|
ablkcipher_request_set_tfm(abreq, enc);
|
|
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
|
|
crypto_authenc_esn_encrypt_done, req);
|
|
ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
|
|
|
|
memcpy(iv, req->iv, crypto_aead_ivsize(authenc_esn));
|
|
|
|
err = crypto_ablkcipher_encrypt(abreq);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_authenc_esn_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
|
|
}
|
|
|
|
static void crypto_authenc_esn_givencrypt_done(struct crypto_async_request *req,
|
|
int err)
|
|
{
|
|
struct aead_request *areq = req->data;
|
|
|
|
if (!err) {
|
|
struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
|
|
|
|
err = crypto_authenc_esn_genicv(areq, greq->giv, 0);
|
|
}
|
|
|
|
authenc_esn_request_complete(areq, err);
|
|
}
|
|
|
|
static int crypto_authenc_esn_givencrypt(struct aead_givcrypt_request *req)
|
|
{
|
|
struct crypto_aead *authenc_esn = aead_givcrypt_reqtfm(req);
|
|
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
|
|
struct aead_request *areq = &req->areq;
|
|
struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
|
|
u8 *iv = req->giv;
|
|
int err;
|
|
|
|
skcipher_givcrypt_set_tfm(greq, ctx->enc);
|
|
skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
|
|
crypto_authenc_esn_givencrypt_done, areq);
|
|
skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
|
|
areq->iv);
|
|
skcipher_givcrypt_set_giv(greq, iv, req->seq);
|
|
|
|
err = crypto_skcipher_givencrypt(greq);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_authenc_esn_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
|
|
}
|
|
|
|
static int crypto_authenc_esn_verify(struct aead_request *req)
|
|
{
|
|
struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
|
|
struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
|
|
u8 *ohash;
|
|
u8 *ihash;
|
|
unsigned int authsize;
|
|
|
|
areq_ctx->complete = authenc_esn_verify_ahash_done;
|
|
areq_ctx->update_complete = authenc_esn_verify_ahash_update_done;
|
|
|
|
ohash = crypto_authenc_esn_ahash(req, CRYPTO_TFM_REQ_MAY_SLEEP);
|
|
if (IS_ERR(ohash))
|
|
return PTR_ERR(ohash);
|
|
|
|
authsize = crypto_aead_authsize(authenc_esn);
|
|
ihash = ohash + authsize;
|
|
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
|
|
authsize, 0);
|
|
return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0;
|
|
}
|
|
|
|
static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv,
|
|
unsigned int cryptlen)
|
|
{
|
|
struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
|
|
struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
|
|
struct scatterlist *src = req->src;
|
|
struct scatterlist *assoc = req->assoc;
|
|
struct scatterlist *cipher = areq_ctx->cipher;
|
|
struct scatterlist *hsg = areq_ctx->hsg;
|
|
struct scatterlist *tsg = areq_ctx->tsg;
|
|
struct scatterlist *assoc1;
|
|
struct scatterlist *assoc2;
|
|
unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
|
|
struct page *srcp;
|
|
u8 *vsrc;
|
|
|
|
srcp = sg_page(src);
|
|
vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
|
|
|
|
if (ivsize) {
|
|
sg_init_table(cipher, 2);
|
|
sg_set_buf(cipher, iv, ivsize);
|
|
scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2);
|
|
src = cipher;
|
|
cryptlen += ivsize;
|
|
}
|
|
|
|
if (sg_is_last(assoc))
|
|
return -EINVAL;
|
|
|
|
assoc1 = assoc + 1;
|
|
if (sg_is_last(assoc1))
|
|
return -EINVAL;
|
|
|
|
assoc2 = assoc + 2;
|
|
if (!sg_is_last(assoc2))
|
|
return -EINVAL;
|
|
|
|
sg_init_table(hsg, 2);
|
|
sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset);
|
|
sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset);
|
|
|
|
sg_init_table(tsg, 1);
|
|
sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset);
|
|
|
|
areq_ctx->cryptlen = cryptlen;
|
|
areq_ctx->headlen = assoc->length + assoc2->length;
|
|
areq_ctx->trailen = assoc1->length;
|
|
areq_ctx->sg = src;
|
|
|
|
areq_ctx->complete = authenc_esn_verify_ahash_done;
|
|
areq_ctx->update_complete = authenc_esn_verify_ahash_update_done;
|
|
areq_ctx->update_complete2 = authenc_esn_verify_ahash_update_done2;
|
|
|
|
return crypto_authenc_esn_verify(req);
|
|
}
|
|
|
|
static int crypto_authenc_esn_decrypt(struct aead_request *req)
|
|
{
|
|
struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
|
|
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
|
|
struct ablkcipher_request *abreq = aead_request_ctx(req);
|
|
unsigned int cryptlen = req->cryptlen;
|
|
unsigned int authsize = crypto_aead_authsize(authenc_esn);
|
|
u8 *iv = req->iv;
|
|
int err;
|
|
|
|
if (cryptlen < authsize)
|
|
return -EINVAL;
|
|
cryptlen -= authsize;
|
|
|
|
err = crypto_authenc_esn_iverify(req, iv, cryptlen);
|
|
if (err)
|
|
return err;
|
|
|
|
ablkcipher_request_set_tfm(abreq, ctx->enc);
|
|
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
|
|
req->base.complete, req->base.data);
|
|
ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
|
|
|
|
return crypto_ablkcipher_decrypt(abreq);
|
|
}
|
|
|
|
static int crypto_authenc_esn_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
|
|
struct authenc_esn_instance_ctx *ictx = crypto_instance_ctx(inst);
|
|
struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
struct crypto_ahash *auth;
|
|
struct crypto_ablkcipher *enc;
|
|
int err;
|
|
|
|
auth = crypto_spawn_ahash(&ictx->auth);
|
|
if (IS_ERR(auth))
|
|
return PTR_ERR(auth);
|
|
|
|
enc = crypto_spawn_skcipher(&ictx->enc);
|
|
err = PTR_ERR(enc);
|
|
if (IS_ERR(enc))
|
|
goto err_free_ahash;
|
|
|
|
ctx->auth = auth;
|
|
ctx->enc = enc;
|
|
|
|
ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
|
|
crypto_ahash_alignmask(auth),
|
|
crypto_ahash_alignmask(auth) + 1) +
|
|
crypto_ablkcipher_ivsize(enc);
|
|
|
|
tfm->crt_aead.reqsize = sizeof(struct authenc_esn_request_ctx) +
|
|
ctx->reqoff +
|
|
max_t(unsigned int,
|
|
crypto_ahash_reqsize(auth) +
|
|
sizeof(struct ahash_request),
|
|
sizeof(struct skcipher_givcrypt_request) +
|
|
crypto_ablkcipher_reqsize(enc));
|
|
|
|
return 0;
|
|
|
|
err_free_ahash:
|
|
crypto_free_ahash(auth);
|
|
return err;
|
|
}
|
|
|
|
static void crypto_authenc_esn_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
crypto_free_ahash(ctx->auth);
|
|
crypto_free_ablkcipher(ctx->enc);
|
|
}
|
|
|
|
static struct crypto_instance *crypto_authenc_esn_alloc(struct rtattr **tb)
|
|
{
|
|
struct crypto_attr_type *algt;
|
|
struct crypto_instance *inst;
|
|
struct hash_alg_common *auth;
|
|
struct crypto_alg *auth_base;
|
|
struct crypto_alg *enc;
|
|
struct authenc_esn_instance_ctx *ctx;
|
|
const char *enc_name;
|
|
int err;
|
|
|
|
algt = crypto_get_attr_type(tb);
|
|
if (IS_ERR(algt))
|
|
return ERR_CAST(algt);
|
|
|
|
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
|
|
CRYPTO_ALG_TYPE_AHASH_MASK);
|
|
if (IS_ERR(auth))
|
|
return ERR_CAST(auth);
|
|
|
|
auth_base = &auth->base;
|
|
|
|
enc_name = crypto_attr_alg_name(tb[2]);
|
|
err = PTR_ERR(enc_name);
|
|
if (IS_ERR(enc_name))
|
|
goto out_put_auth;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!inst)
|
|
goto out_put_auth;
|
|
|
|
ctx = crypto_instance_ctx(inst);
|
|
|
|
err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
crypto_set_skcipher_spawn(&ctx->enc, inst);
|
|
err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
|
|
crypto_requires_sync(algt->type,
|
|
algt->mask));
|
|
if (err)
|
|
goto err_drop_auth;
|
|
|
|
enc = crypto_skcipher_spawn_alg(&ctx->enc);
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"authencesn(%s,%s)", auth_base->cra_name, enc->cra_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_drop_enc;
|
|
|
|
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"authencesn(%s,%s)", auth_base->cra_driver_name,
|
|
enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_drop_enc;
|
|
|
|
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
|
|
inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
|
|
inst->alg.cra_priority = enc->cra_priority *
|
|
10 + auth_base->cra_priority;
|
|
inst->alg.cra_blocksize = enc->cra_blocksize;
|
|
inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
|
|
inst->alg.cra_type = &crypto_aead_type;
|
|
|
|
inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
|
|
inst->alg.cra_aead.maxauthsize = auth->digestsize;
|
|
|
|
inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
|
|
|
|
inst->alg.cra_init = crypto_authenc_esn_init_tfm;
|
|
inst->alg.cra_exit = crypto_authenc_esn_exit_tfm;
|
|
|
|
inst->alg.cra_aead.setkey = crypto_authenc_esn_setkey;
|
|
inst->alg.cra_aead.encrypt = crypto_authenc_esn_encrypt;
|
|
inst->alg.cra_aead.decrypt = crypto_authenc_esn_decrypt;
|
|
inst->alg.cra_aead.givencrypt = crypto_authenc_esn_givencrypt;
|
|
|
|
out:
|
|
crypto_mod_put(auth_base);
|
|
return inst;
|
|
|
|
err_drop_enc:
|
|
crypto_drop_skcipher(&ctx->enc);
|
|
err_drop_auth:
|
|
crypto_drop_ahash(&ctx->auth);
|
|
err_free_inst:
|
|
kfree(inst);
|
|
out_put_auth:
|
|
inst = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
|
|
static void crypto_authenc_esn_free(struct crypto_instance *inst)
|
|
{
|
|
struct authenc_esn_instance_ctx *ctx = crypto_instance_ctx(inst);
|
|
|
|
crypto_drop_skcipher(&ctx->enc);
|
|
crypto_drop_ahash(&ctx->auth);
|
|
kfree(inst);
|
|
}
|
|
|
|
static struct crypto_template crypto_authenc_esn_tmpl = {
|
|
.name = "authencesn",
|
|
.alloc = crypto_authenc_esn_alloc,
|
|
.free = crypto_authenc_esn_free,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init crypto_authenc_esn_module_init(void)
|
|
{
|
|
return crypto_register_template(&crypto_authenc_esn_tmpl);
|
|
}
|
|
|
|
static void __exit crypto_authenc_esn_module_exit(void)
|
|
{
|
|
crypto_unregister_template(&crypto_authenc_esn_tmpl);
|
|
}
|
|
|
|
module_init(crypto_authenc_esn_module_init);
|
|
module_exit(crypto_authenc_esn_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
|
|
MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
|