blob: 136b68b9d8d4646e60dbe6399abf3f52c67568f0 [file] [log] [blame]
/*
* 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/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)
{
unsigned int authkeylen;
unsigned int enckeylen;
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
struct crypto_ahash *auth = ctx->auth;
struct crypto_ablkcipher *enc = ctx->enc;
struct rtattr *rta = (void *)key;
struct crypto_authenc_key_param *param;
int err = -EINVAL;
if (!RTA_OK(rta, keylen))
goto badkey;
if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
goto badkey;
if (RTA_PAYLOAD(rta) < sizeof(*param))
goto badkey;
param = RTA_DATA(rta);
enckeylen = be32_to_cpu(param->enckeylen);
key += RTA_ALIGN(rta->rta_len);
keylen -= RTA_ALIGN(rta->rta_len);
if (keylen < enckeylen)
goto badkey;
authkeylen = keylen - enckeylen;
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, key, 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, key + authkeylen, 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 = memcmp(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 = memcmp(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 = memcmp(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;
struct scatterlist *assoc1;
struct scatterlist *assoc2;
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 (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 = 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 memcmp(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);
err = PTR_ERR(algt);
if (IS_ERR(algt))
return ERR_PTR(err);
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");