mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Herbert Xu](/assets/img/avatar_default.png)
The ESP code has been updated to generate a completely linear
AD SG list. This unfortunately broke authencesn which expects
the AD to be divided into at least three parts.
This patch fixes it to cope with the new format. Later we will
fix it properly to accept arbitrary input and not rely on the
input being linear as part of the AEAD conversion.
Fixes: 7021b2e1cd
("esp4: Switch to new AEAD interface")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
798 lines
23 KiB
C
798 lines
23 KiB
C
/*
|
|
* authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
|
|
* derived from authenc.c
|
|
*
|
|
* Copyright (C) 2010 secunet Security Networks AG
|
|
* Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <crypto/internal/aead.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <crypto/internal/skcipher.h>
|
|
#include <crypto/authenc.h>
|
|
#include <crypto/scatterwalk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
struct authenc_esn_instance_ctx {
|
|
struct crypto_ahash_spawn auth;
|
|
struct crypto_skcipher_spawn enc;
|
|
};
|
|
|
|
struct crypto_authenc_esn_ctx {
|
|
unsigned int reqoff;
|
|
struct crypto_ahash *auth;
|
|
struct crypto_ablkcipher *enc;
|
|
};
|
|
|
|
struct authenc_esn_request_ctx {
|
|
unsigned int cryptlen;
|
|
unsigned int headlen;
|
|
unsigned int trailen;
|
|
struct scatterlist *sg;
|
|
struct scatterlist hsg[2];
|
|
struct scatterlist tsg[1];
|
|
struct scatterlist cipher[2];
|
|
crypto_completion_t complete;
|
|
crypto_completion_t update_complete;
|
|
crypto_completion_t update_complete2;
|
|
char tail[];
|
|
};
|
|
|
|
static void authenc_esn_request_complete(struct aead_request *req, int err)
|
|
{
|
|
if (err != -EINPROGRESS)
|
|
aead_request_complete(req, err);
|
|
}
|
|
|
|
static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
|
|
struct crypto_ahash *auth = ctx->auth;
|
|
struct crypto_ablkcipher *enc = ctx->enc;
|
|
struct crypto_authenc_keys keys;
|
|
int err = -EINVAL;
|
|
|
|
if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
|
|
goto badkey;
|
|
|
|
crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
|
|
crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
|
|
crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
|
|
CRYPTO_TFM_RES_MASK);
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
|
|
crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen);
|
|
crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) &
|
|
CRYPTO_TFM_RES_MASK);
|
|
|
|
out:
|
|
return err;
|
|
|
|
badkey:
|
|
crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
|
goto out;
|
|
}
|
|
|
|
static void authenc_esn_geniv_ahash_update_done(struct crypto_async_request *areq,
|
|
int err)
|
|
{
|
|
struct aead_request *req = areq->data;
|
|
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 ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
|
|
areq_ctx->cryptlen);
|
|
ahash_request_set_callback(ahreq, aead_request_flags(req) &
|
|
CRYPTO_TFM_REQ_MAY_SLEEP,
|
|
areq_ctx->update_complete2, req);
|
|
|
|
err = crypto_ahash_update(ahreq);
|
|
if (err)
|
|
goto out;
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
|
|
areq_ctx->trailen);
|
|
ahash_request_set_callback(ahreq, aead_request_flags(req) &
|
|
CRYPTO_TFM_REQ_MAY_SLEEP,
|
|
areq_ctx->complete, req);
|
|
|
|
err = crypto_ahash_finup(ahreq);
|
|
if (err)
|
|
goto out;
|
|
|
|
scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
|
|
areq_ctx->cryptlen,
|
|
crypto_aead_authsize(authenc_esn), 1);
|
|
|
|
out:
|
|
authenc_esn_request_complete(req, err);
|
|
}
|
|
|
|
static void authenc_esn_geniv_ahash_update_done2(struct crypto_async_request *areq,
|
|
int err)
|
|
{
|
|
struct aead_request *req = areq->data;
|
|
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 ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
|
|
areq_ctx->trailen);
|
|
ahash_request_set_callback(ahreq, aead_request_flags(req) &
|
|
CRYPTO_TFM_REQ_MAY_SLEEP,
|
|
areq_ctx->complete, req);
|
|
|
|
err = crypto_ahash_finup(ahreq);
|
|
if (err)
|
|
goto out;
|
|
|
|
scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
|
|
areq_ctx->cryptlen,
|
|
crypto_aead_authsize(authenc_esn), 1);
|
|
|
|
out:
|
|
authenc_esn_request_complete(req, err);
|
|
}
|
|
|
|
|
|
static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
|
|
int err)
|
|
{
|
|
struct aead_request *req = areq->data;
|
|
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 ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
|
|
areq_ctx->cryptlen,
|
|
crypto_aead_authsize(authenc_esn), 1);
|
|
|
|
out:
|
|
aead_request_complete(req, err);
|
|
}
|
|
|
|
|
|
static void authenc_esn_verify_ahash_update_done(struct crypto_async_request *areq,
|
|
int err)
|
|
{
|
|
u8 *ihash;
|
|
unsigned int authsize;
|
|
struct ablkcipher_request *abreq;
|
|
struct aead_request *req = areq->data;
|
|
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 ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
|
|
unsigned int cryptlen = req->cryptlen;
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
|
|
areq_ctx->cryptlen);
|
|
|
|
ahash_request_set_callback(ahreq,
|
|
aead_request_flags(req) &
|
|
CRYPTO_TFM_REQ_MAY_SLEEP,
|
|
areq_ctx->update_complete2, req);
|
|
|
|
err = crypto_ahash_update(ahreq);
|
|
if (err)
|
|
goto out;
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
|
|
areq_ctx->trailen);
|
|
ahash_request_set_callback(ahreq, aead_request_flags(req) &
|
|
CRYPTO_TFM_REQ_MAY_SLEEP,
|
|
areq_ctx->complete, req);
|
|
|
|
err = crypto_ahash_finup(ahreq);
|
|
if (err)
|
|
goto out;
|
|
|
|
authsize = crypto_aead_authsize(authenc_esn);
|
|
cryptlen -= authsize;
|
|
ihash = ahreq->result + authsize;
|
|
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
|
|
authsize, 0);
|
|
|
|
err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
|
|
if (err)
|
|
goto out;
|
|
|
|
abreq = aead_request_ctx(req);
|
|
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, req->iv);
|
|
|
|
err = crypto_ablkcipher_decrypt(abreq);
|
|
|
|
out:
|
|
authenc_esn_request_complete(req, err);
|
|
}
|
|
|
|
static void authenc_esn_verify_ahash_update_done2(struct crypto_async_request *areq,
|
|
int err)
|
|
{
|
|
u8 *ihash;
|
|
unsigned int authsize;
|
|
struct ablkcipher_request *abreq;
|
|
struct aead_request *req = areq->data;
|
|
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 ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
|
|
unsigned int cryptlen = req->cryptlen;
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
|
|
areq_ctx->trailen);
|
|
ahash_request_set_callback(ahreq, aead_request_flags(req) &
|
|
CRYPTO_TFM_REQ_MAY_SLEEP,
|
|
areq_ctx->complete, req);
|
|
|
|
err = crypto_ahash_finup(ahreq);
|
|
if (err)
|
|
goto out;
|
|
|
|
authsize = crypto_aead_authsize(authenc_esn);
|
|
cryptlen -= authsize;
|
|
ihash = ahreq->result + authsize;
|
|
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
|
|
authsize, 0);
|
|
|
|
err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
|
|
if (err)
|
|
goto out;
|
|
|
|
abreq = aead_request_ctx(req);
|
|
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, req->iv);
|
|
|
|
err = crypto_ablkcipher_decrypt(abreq);
|
|
|
|
out:
|
|
authenc_esn_request_complete(req, err);
|
|
}
|
|
|
|
|
|
static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
|
|
int err)
|
|
{
|
|
u8 *ihash;
|
|
unsigned int authsize;
|
|
struct ablkcipher_request *abreq;
|
|
struct aead_request *req = areq->data;
|
|
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 ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
|
|
unsigned int cryptlen = req->cryptlen;
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
authsize = crypto_aead_authsize(authenc_esn);
|
|
cryptlen -= authsize;
|
|
ihash = ahreq->result + authsize;
|
|
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
|
|
authsize, 0);
|
|
|
|
err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
|
|
if (err)
|
|
goto out;
|
|
|
|
abreq = aead_request_ctx(req);
|
|
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, req->iv);
|
|
|
|
err = crypto_ablkcipher_decrypt(abreq);
|
|
|
|
out:
|
|
authenc_esn_request_complete(req, err);
|
|
}
|
|
|
|
static u8 *crypto_authenc_esn_ahash(struct aead_request *req,
|
|
unsigned int flags)
|
|
{
|
|
struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
|
|
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
|
|
struct crypto_ahash *auth = ctx->auth;
|
|
struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
|
|
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
|
|
u8 *hash = areq_ctx->tail;
|
|
int err;
|
|
|
|
hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
|
|
crypto_ahash_alignmask(auth) + 1);
|
|
|
|
ahash_request_set_tfm(ahreq, auth);
|
|
|
|
err = crypto_ahash_init(ahreq);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->hsg, hash, areq_ctx->headlen);
|
|
ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
|
|
areq_ctx->update_complete, req);
|
|
|
|
err = crypto_ahash_update(ahreq);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, areq_ctx->cryptlen);
|
|
ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
|
|
areq_ctx->update_complete2, req);
|
|
|
|
err = crypto_ahash_update(ahreq);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
ahash_request_set_crypt(ahreq, areq_ctx->tsg, hash,
|
|
areq_ctx->trailen);
|
|
ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
|
|
areq_ctx->complete, req);
|
|
|
|
err = crypto_ahash_finup(ahreq);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
return hash;
|
|
}
|
|
|
|
static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv,
|
|
unsigned int flags)
|
|
{
|
|
struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
|
|
struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
|
|
struct scatterlist *dst = req->dst;
|
|
struct scatterlist *assoc = req->assoc;
|
|
struct scatterlist *cipher = areq_ctx->cipher;
|
|
struct scatterlist *hsg = areq_ctx->hsg;
|
|
struct scatterlist *tsg = areq_ctx->tsg;
|
|
unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
|
|
unsigned int cryptlen = req->cryptlen;
|
|
struct page *dstp;
|
|
u8 *vdst;
|
|
u8 *hash;
|
|
|
|
dstp = sg_page(dst);
|
|
vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
|
|
|
|
if (ivsize) {
|
|
sg_init_table(cipher, 2);
|
|
sg_set_buf(cipher, iv, ivsize);
|
|
scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2);
|
|
dst = cipher;
|
|
cryptlen += ivsize;
|
|
}
|
|
|
|
if (assoc->length < 12)
|
|
return -EINVAL;
|
|
|
|
sg_init_table(hsg, 2);
|
|
sg_set_page(hsg, sg_page(assoc), 4, assoc->offset);
|
|
sg_set_page(hsg + 1, sg_page(assoc), 4, assoc->offset + 8);
|
|
|
|
sg_init_table(tsg, 1);
|
|
sg_set_page(tsg, sg_page(assoc), 4, assoc->offset + 4);
|
|
|
|
areq_ctx->cryptlen = cryptlen;
|
|
areq_ctx->headlen = 8;
|
|
areq_ctx->trailen = 4;
|
|
areq_ctx->sg = dst;
|
|
|
|
areq_ctx->complete = authenc_esn_geniv_ahash_done;
|
|
areq_ctx->update_complete = authenc_esn_geniv_ahash_update_done;
|
|
areq_ctx->update_complete2 = authenc_esn_geniv_ahash_update_done2;
|
|
|
|
hash = crypto_authenc_esn_ahash(req, flags);
|
|
if (IS_ERR(hash))
|
|
return PTR_ERR(hash);
|
|
|
|
scatterwalk_map_and_copy(hash, dst, cryptlen,
|
|
crypto_aead_authsize(authenc_esn), 1);
|
|
return 0;
|
|
}
|
|
|
|
|
|
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;
|
|
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 (assoc->length < 12)
|
|
return -EINVAL;
|
|
|
|
sg_init_table(hsg, 2);
|
|
sg_set_page(hsg, sg_page(assoc), 4, assoc->offset);
|
|
sg_set_page(hsg + 1, sg_page(assoc), 4, assoc->offset + 8);
|
|
|
|
sg_init_table(tsg, 1);
|
|
sg_set_page(tsg, sg_page(assoc), 4, assoc->offset + 4);
|
|
|
|
areq_ctx->cryptlen = cryptlen;
|
|
areq_ctx->headlen = 8;
|
|
areq_ctx->trailen = 4;
|
|
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);
|
|
|
|
crypto_aead_set_reqsize(__crypto_aead_cast(tfm),
|
|
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");
|
|
MODULE_ALIAS_CRYPTO("authencesn");
|