mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 19:06:40 +07:00
516280e735
Its a valid use case to have null associated data in a ccm vector, but this case isn't being handled properly right now. The following ccm decryption/verification test vector, using the rfc4309 implementation regularly triggers a panic, as will any other vector with null assoc data: * key: ab2f8a74b71cd2b1ff802e487d82f8b9 * iv: c6fb7d800d13abd8a6b2d8 * Associated Data: [NULL] * Tag Length: 8 * input: d5e8939fc7892e2b The resulting panic looks like so: Unable to handle kernel paging request at ffff810064ddaec0 RIP: [<ffffffff8864c4d7>] :ccm:get_data_to_compute+0x1a6/0x1d6 PGD 8063 PUD 0 Oops: 0002 [1] SMP last sysfs file: /module/libata/version CPU 0 Modules linked in: crypto_tester_kmod(U) seqiv krng ansi_cprng chainiv rng ctr aes_generic aes_x86_64 ccm cryptomgr testmgr_cipher testmgr aead crypto_blkcipher crypto_a lgapi des ipv6 xfrm_nalgo crypto_api autofs4 hidp l2cap bluetooth nfs lockd fscache nfs_acl sunrpc ip_conntrack_netbios_ns ipt_REJECT xt_state ip_conntrack nfnetlink xt_ tcpudp iptable_filter ip_tables x_tables dm_mirror dm_log dm_multipath scsi_dh dm_mod video hwmon backlight sbs i2c_ec button battery asus_acpi acpi_memhotplug ac lp sg snd_intel8x0 snd_ac97_codec ac97_bus snd_seq_dummy snd_seq_oss joydev snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss ide_cd snd_pcm floppy parport_p c shpchp e752x_edac snd_timer e1000 i2c_i801 edac_mc snd soundcore snd_page_alloc i2c_core cdrom parport serio_raw pcspkr ata_piix libata sd_mod scsi_mod ext3 jbd uhci_h cd ohci_hcd ehci_hcd Pid: 12844, comm: crypto-tester Tainted: G 2.6.18-128.el5.fips1 #1 RIP: 0010:[<ffffffff8864c4d7>] [<ffffffff8864c4d7>] :ccm:get_data_to_compute+0x1a6/0x1d6 RSP: 0018:ffff8100134434e8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8100104898b0 RCX: ffffffffab6aea10 RDX: 0000000000000010 RSI: ffff8100104898c0 RDI: ffff810064ddaec0 RBP: 0000000000000000 R08: ffff8100104898b0 R09: 0000000000000000 R10: ffff8100103bac84 R11: ffff8100104898b0 R12: ffff810010489858 R13: ffff8100104898b0 R14: ffff8100103bac00 R15: 0000000000000000 FS: 00002ab881adfd30(0000) GS:ffffffff803ac000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff810064ddaec0 CR3: 0000000012a88000 CR4: 00000000000006e0 Process crypto-tester (pid: 12844, threadinfo ffff810013442000, task ffff81003d165860) Stack: ffff8100103bac00 ffff8100104898e8 ffff8100134436f8 ffffffff00000000 0000000000000000 ffff8100104898b0 0000000000000000 ffff810010489858 0000000000000000 ffff8100103bac00 ffff8100134436f8 ffffffff8864c634 Call Trace: [<ffffffff8864c634>] :ccm:crypto_ccm_auth+0x12d/0x140 [<ffffffff8864cf73>] :ccm:crypto_ccm_decrypt+0x161/0x23a [<ffffffff88633643>] :crypto_tester_kmod:cavs_test_rfc4309_ccm+0x4a5/0x559 [...] The above is from a RHEL5-based kernel, but upstream is susceptible too. The fix is trivial: in crypto/ccm.c:crypto_ccm_auth(), pctx->ilen contains whatever was in memory when pctx was allocated if assoclen is 0. The tested fix is to simply add an else clause setting pctx->ilen to 0 for the assoclen == 0 case, so that get_data_to_compute() doesn't try doing things its not supposed to. Signed-off-by: Jarod Wilson <jarod@redhat.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
892 lines
22 KiB
C
892 lines
22 KiB
C
/*
|
|
* CCM: Counter with CBC-MAC
|
|
*
|
|
* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.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/skcipher.h>
|
|
#include <crypto/scatterwalk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "internal.h"
|
|
|
|
struct ccm_instance_ctx {
|
|
struct crypto_skcipher_spawn ctr;
|
|
struct crypto_spawn cipher;
|
|
};
|
|
|
|
struct crypto_ccm_ctx {
|
|
struct crypto_cipher *cipher;
|
|
struct crypto_ablkcipher *ctr;
|
|
};
|
|
|
|
struct crypto_rfc4309_ctx {
|
|
struct crypto_aead *child;
|
|
u8 nonce[3];
|
|
};
|
|
|
|
struct crypto_ccm_req_priv_ctx {
|
|
u8 odata[16];
|
|
u8 idata[16];
|
|
u8 auth_tag[16];
|
|
u32 ilen;
|
|
u32 flags;
|
|
struct scatterlist src[2];
|
|
struct scatterlist dst[2];
|
|
struct ablkcipher_request abreq;
|
|
};
|
|
|
|
static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx(
|
|
struct aead_request *req)
|
|
{
|
|
unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
|
|
|
|
return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
|
|
}
|
|
|
|
static int set_msg_len(u8 *block, unsigned int msglen, int csize)
|
|
{
|
|
__be32 data;
|
|
|
|
memset(block, 0, csize);
|
|
block += csize;
|
|
|
|
if (csize >= 4)
|
|
csize = 4;
|
|
else if (msglen > (1 << (8 * csize)))
|
|
return -EOVERFLOW;
|
|
|
|
data = cpu_to_be32(msglen);
|
|
memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct crypto_ablkcipher *ctr = ctx->ctr;
|
|
struct crypto_cipher *tfm = ctx->cipher;
|
|
int err = 0;
|
|
|
|
crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
|
|
crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
err = crypto_ablkcipher_setkey(ctr, key, keylen);
|
|
crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
|
|
CRYPTO_TFM_RES_MASK);
|
|
if (err)
|
|
goto out;
|
|
|
|
crypto_cipher_clear_flags(tfm, CRYPTO_TFM_REQ_MASK);
|
|
crypto_cipher_set_flags(tfm, crypto_aead_get_flags(aead) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
err = crypto_cipher_setkey(tfm, key, keylen);
|
|
crypto_aead_set_flags(aead, crypto_cipher_get_flags(tfm) &
|
|
CRYPTO_TFM_RES_MASK);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
|
|
unsigned int authsize)
|
|
{
|
|
switch (authsize) {
|
|
case 4:
|
|
case 6:
|
|
case 8:
|
|
case 10:
|
|
case 12:
|
|
case 14:
|
|
case 16:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int format_input(u8 *info, struct aead_request *req,
|
|
unsigned int cryptlen)
|
|
{
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
unsigned int lp = req->iv[0];
|
|
unsigned int l = lp + 1;
|
|
unsigned int m;
|
|
|
|
m = crypto_aead_authsize(aead);
|
|
|
|
memcpy(info, req->iv, 16);
|
|
|
|
/* format control info per RFC 3610 and
|
|
* NIST Special Publication 800-38C
|
|
*/
|
|
*info |= (8 * ((m - 2) / 2));
|
|
if (req->assoclen)
|
|
*info |= 64;
|
|
|
|
return set_msg_len(info + 16 - l, cryptlen, l);
|
|
}
|
|
|
|
static int format_adata(u8 *adata, unsigned int a)
|
|
{
|
|
int len = 0;
|
|
|
|
/* add control info for associated data
|
|
* RFC 3610 and NIST Special Publication 800-38C
|
|
*/
|
|
if (a < 65280) {
|
|
*(__be16 *)adata = cpu_to_be16(a);
|
|
len = 2;
|
|
} else {
|
|
*(__be16 *)adata = cpu_to_be16(0xfffe);
|
|
*(__be32 *)&adata[2] = cpu_to_be32(a);
|
|
len = 6;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static void compute_mac(struct crypto_cipher *tfm, u8 *data, int n,
|
|
struct crypto_ccm_req_priv_ctx *pctx)
|
|
{
|
|
unsigned int bs = 16;
|
|
u8 *odata = pctx->odata;
|
|
u8 *idata = pctx->idata;
|
|
int datalen, getlen;
|
|
|
|
datalen = n;
|
|
|
|
/* first time in here, block may be partially filled. */
|
|
getlen = bs - pctx->ilen;
|
|
if (datalen >= getlen) {
|
|
memcpy(idata + pctx->ilen, data, getlen);
|
|
crypto_xor(odata, idata, bs);
|
|
crypto_cipher_encrypt_one(tfm, odata, odata);
|
|
datalen -= getlen;
|
|
data += getlen;
|
|
pctx->ilen = 0;
|
|
}
|
|
|
|
/* now encrypt rest of data */
|
|
while (datalen >= bs) {
|
|
crypto_xor(odata, data, bs);
|
|
crypto_cipher_encrypt_one(tfm, odata, odata);
|
|
|
|
datalen -= bs;
|
|
data += bs;
|
|
}
|
|
|
|
/* check and see if there's leftover data that wasn't
|
|
* enough to fill a block.
|
|
*/
|
|
if (datalen) {
|
|
memcpy(idata + pctx->ilen, data, datalen);
|
|
pctx->ilen += datalen;
|
|
}
|
|
}
|
|
|
|
static void get_data_to_compute(struct crypto_cipher *tfm,
|
|
struct crypto_ccm_req_priv_ctx *pctx,
|
|
struct scatterlist *sg, unsigned int len)
|
|
{
|
|
struct scatter_walk walk;
|
|
u8 *data_src;
|
|
int n;
|
|
|
|
scatterwalk_start(&walk, sg);
|
|
|
|
while (len) {
|
|
n = scatterwalk_clamp(&walk, len);
|
|
if (!n) {
|
|
scatterwalk_start(&walk, sg_next(walk.sg));
|
|
n = scatterwalk_clamp(&walk, len);
|
|
}
|
|
data_src = scatterwalk_map(&walk, 0);
|
|
|
|
compute_mac(tfm, data_src, n, pctx);
|
|
len -= n;
|
|
|
|
scatterwalk_unmap(data_src, 0);
|
|
scatterwalk_advance(&walk, n);
|
|
scatterwalk_done(&walk, 0, len);
|
|
if (len)
|
|
crypto_yield(pctx->flags);
|
|
}
|
|
|
|
/* any leftover needs padding and then encrypted */
|
|
if (pctx->ilen) {
|
|
int padlen;
|
|
u8 *odata = pctx->odata;
|
|
u8 *idata = pctx->idata;
|
|
|
|
padlen = 16 - pctx->ilen;
|
|
memset(idata + pctx->ilen, 0, padlen);
|
|
crypto_xor(odata, idata, 16);
|
|
crypto_cipher_encrypt_one(tfm, odata, odata);
|
|
pctx->ilen = 0;
|
|
}
|
|
}
|
|
|
|
static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
|
|
unsigned int cryptlen)
|
|
{
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
|
|
struct crypto_cipher *cipher = ctx->cipher;
|
|
unsigned int assoclen = req->assoclen;
|
|
u8 *odata = pctx->odata;
|
|
u8 *idata = pctx->idata;
|
|
int err;
|
|
|
|
/* format control data for input */
|
|
err = format_input(odata, req, cryptlen);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* encrypt first block to use as start in computing mac */
|
|
crypto_cipher_encrypt_one(cipher, odata, odata);
|
|
|
|
/* format associated data and compute into mac */
|
|
if (assoclen) {
|
|
pctx->ilen = format_adata(idata, assoclen);
|
|
get_data_to_compute(cipher, pctx, req->assoc, req->assoclen);
|
|
} else {
|
|
pctx->ilen = 0;
|
|
}
|
|
|
|
/* compute plaintext into mac */
|
|
get_data_to_compute(cipher, pctx, plain, cryptlen);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
|
|
{
|
|
struct aead_request *req = areq->data;
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
|
|
u8 *odata = pctx->odata;
|
|
|
|
if (!err)
|
|
scatterwalk_map_and_copy(odata, req->dst, req->cryptlen,
|
|
crypto_aead_authsize(aead), 1);
|
|
aead_request_complete(req, err);
|
|
}
|
|
|
|
static inline int crypto_ccm_check_iv(const u8 *iv)
|
|
{
|
|
/* 2 <= L <= 8, so 1 <= L' <= 7. */
|
|
if (1 > iv[0] || iv[0] > 7)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_ccm_encrypt(struct aead_request *req)
|
|
{
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
|
|
struct ablkcipher_request *abreq = &pctx->abreq;
|
|
struct scatterlist *dst;
|
|
unsigned int cryptlen = req->cryptlen;
|
|
u8 *odata = pctx->odata;
|
|
u8 *iv = req->iv;
|
|
int err;
|
|
|
|
err = crypto_ccm_check_iv(iv);
|
|
if (err)
|
|
return err;
|
|
|
|
pctx->flags = aead_request_flags(req);
|
|
|
|
err = crypto_ccm_auth(req, req->src, cryptlen);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Note: rfc 3610 and NIST 800-38C require counter of
|
|
* zero to encrypt auth tag.
|
|
*/
|
|
memset(iv + 15 - iv[0], 0, iv[0] + 1);
|
|
|
|
sg_init_table(pctx->src, 2);
|
|
sg_set_buf(pctx->src, odata, 16);
|
|
scatterwalk_sg_chain(pctx->src, 2, req->src);
|
|
|
|
dst = pctx->src;
|
|
if (req->src != req->dst) {
|
|
sg_init_table(pctx->dst, 2);
|
|
sg_set_buf(pctx->dst, odata, 16);
|
|
scatterwalk_sg_chain(pctx->dst, 2, req->dst);
|
|
dst = pctx->dst;
|
|
}
|
|
|
|
ablkcipher_request_set_tfm(abreq, ctx->ctr);
|
|
ablkcipher_request_set_callback(abreq, pctx->flags,
|
|
crypto_ccm_encrypt_done, req);
|
|
ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv);
|
|
err = crypto_ablkcipher_encrypt(abreq);
|
|
if (err)
|
|
return err;
|
|
|
|
/* copy authtag to end of dst */
|
|
scatterwalk_map_and_copy(odata, req->dst, cryptlen,
|
|
crypto_aead_authsize(aead), 1);
|
|
return err;
|
|
}
|
|
|
|
static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
|
|
int err)
|
|
{
|
|
struct aead_request *req = areq->data;
|
|
struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
unsigned int authsize = crypto_aead_authsize(aead);
|
|
unsigned int cryptlen = req->cryptlen - authsize;
|
|
|
|
if (!err) {
|
|
err = crypto_ccm_auth(req, req->dst, cryptlen);
|
|
if (!err && memcmp(pctx->auth_tag, pctx->odata, authsize))
|
|
err = -EBADMSG;
|
|
}
|
|
aead_request_complete(req, err);
|
|
}
|
|
|
|
static int crypto_ccm_decrypt(struct aead_request *req)
|
|
{
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
|
|
struct ablkcipher_request *abreq = &pctx->abreq;
|
|
struct scatterlist *dst;
|
|
unsigned int authsize = crypto_aead_authsize(aead);
|
|
unsigned int cryptlen = req->cryptlen;
|
|
u8 *authtag = pctx->auth_tag;
|
|
u8 *odata = pctx->odata;
|
|
u8 *iv = req->iv;
|
|
int err;
|
|
|
|
if (cryptlen < authsize)
|
|
return -EINVAL;
|
|
cryptlen -= authsize;
|
|
|
|
err = crypto_ccm_check_iv(iv);
|
|
if (err)
|
|
return err;
|
|
|
|
pctx->flags = aead_request_flags(req);
|
|
|
|
scatterwalk_map_and_copy(authtag, req->src, cryptlen, authsize, 0);
|
|
|
|
memset(iv + 15 - iv[0], 0, iv[0] + 1);
|
|
|
|
sg_init_table(pctx->src, 2);
|
|
sg_set_buf(pctx->src, authtag, 16);
|
|
scatterwalk_sg_chain(pctx->src, 2, req->src);
|
|
|
|
dst = pctx->src;
|
|
if (req->src != req->dst) {
|
|
sg_init_table(pctx->dst, 2);
|
|
sg_set_buf(pctx->dst, authtag, 16);
|
|
scatterwalk_sg_chain(pctx->dst, 2, req->dst);
|
|
dst = pctx->dst;
|
|
}
|
|
|
|
ablkcipher_request_set_tfm(abreq, ctx->ctr);
|
|
ablkcipher_request_set_callback(abreq, pctx->flags,
|
|
crypto_ccm_decrypt_done, req);
|
|
ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv);
|
|
err = crypto_ablkcipher_decrypt(abreq);
|
|
if (err)
|
|
return err;
|
|
|
|
err = crypto_ccm_auth(req, req->dst, cryptlen);
|
|
if (err)
|
|
return err;
|
|
|
|
/* verify */
|
|
if (memcmp(authtag, odata, authsize))
|
|
return -EBADMSG;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int crypto_ccm_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
|
struct ccm_instance_ctx *ictx = crypto_instance_ctx(inst);
|
|
struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
struct crypto_cipher *cipher;
|
|
struct crypto_ablkcipher *ctr;
|
|
unsigned long align;
|
|
int err;
|
|
|
|
cipher = crypto_spawn_cipher(&ictx->cipher);
|
|
if (IS_ERR(cipher))
|
|
return PTR_ERR(cipher);
|
|
|
|
ctr = crypto_spawn_skcipher(&ictx->ctr);
|
|
err = PTR_ERR(ctr);
|
|
if (IS_ERR(ctr))
|
|
goto err_free_cipher;
|
|
|
|
ctx->cipher = cipher;
|
|
ctx->ctr = ctr;
|
|
|
|
align = crypto_tfm_alg_alignmask(tfm);
|
|
align &= ~(crypto_tfm_ctx_alignment() - 1);
|
|
tfm->crt_aead.reqsize = align +
|
|
sizeof(struct crypto_ccm_req_priv_ctx) +
|
|
crypto_ablkcipher_reqsize(ctr);
|
|
|
|
return 0;
|
|
|
|
err_free_cipher:
|
|
crypto_free_cipher(cipher);
|
|
return err;
|
|
}
|
|
|
|
static void crypto_ccm_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
crypto_free_cipher(ctx->cipher);
|
|
crypto_free_ablkcipher(ctx->ctr);
|
|
}
|
|
|
|
static struct crypto_instance *crypto_ccm_alloc_common(struct rtattr **tb,
|
|
const char *full_name,
|
|
const char *ctr_name,
|
|
const char *cipher_name)
|
|
{
|
|
struct crypto_attr_type *algt;
|
|
struct crypto_instance *inst;
|
|
struct crypto_alg *ctr;
|
|
struct crypto_alg *cipher;
|
|
struct ccm_instance_ctx *ictx;
|
|
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);
|
|
|
|
cipher = crypto_alg_mod_lookup(cipher_name, CRYPTO_ALG_TYPE_CIPHER,
|
|
CRYPTO_ALG_TYPE_MASK);
|
|
err = PTR_ERR(cipher);
|
|
if (IS_ERR(cipher))
|
|
return ERR_PTR(err);
|
|
|
|
err = -EINVAL;
|
|
if (cipher->cra_blocksize != 16)
|
|
goto out_put_cipher;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!inst)
|
|
goto out_put_cipher;
|
|
|
|
ictx = crypto_instance_ctx(inst);
|
|
|
|
err = crypto_init_spawn(&ictx->cipher, cipher, inst,
|
|
CRYPTO_ALG_TYPE_MASK);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
crypto_set_skcipher_spawn(&ictx->ctr, inst);
|
|
err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
|
|
crypto_requires_sync(algt->type,
|
|
algt->mask));
|
|
if (err)
|
|
goto err_drop_cipher;
|
|
|
|
ctr = crypto_skcipher_spawn_alg(&ictx->ctr);
|
|
|
|
/* Not a stream cipher? */
|
|
err = -EINVAL;
|
|
if (ctr->cra_blocksize != 1)
|
|
goto err_drop_ctr;
|
|
|
|
/* We want the real thing! */
|
|
if (ctr->cra_ablkcipher.ivsize != 16)
|
|
goto err_drop_ctr;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"ccm_base(%s,%s)", ctr->cra_driver_name,
|
|
cipher->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_drop_ctr;
|
|
|
|
memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
|
|
|
|
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
|
|
inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
|
|
inst->alg.cra_priority = cipher->cra_priority + ctr->cra_priority;
|
|
inst->alg.cra_blocksize = 1;
|
|
inst->alg.cra_alignmask = cipher->cra_alignmask | ctr->cra_alignmask |
|
|
(__alignof__(u32) - 1);
|
|
inst->alg.cra_type = &crypto_aead_type;
|
|
inst->alg.cra_aead.ivsize = 16;
|
|
inst->alg.cra_aead.maxauthsize = 16;
|
|
inst->alg.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
|
|
inst->alg.cra_init = crypto_ccm_init_tfm;
|
|
inst->alg.cra_exit = crypto_ccm_exit_tfm;
|
|
inst->alg.cra_aead.setkey = crypto_ccm_setkey;
|
|
inst->alg.cra_aead.setauthsize = crypto_ccm_setauthsize;
|
|
inst->alg.cra_aead.encrypt = crypto_ccm_encrypt;
|
|
inst->alg.cra_aead.decrypt = crypto_ccm_decrypt;
|
|
|
|
out:
|
|
crypto_mod_put(cipher);
|
|
return inst;
|
|
|
|
err_drop_ctr:
|
|
crypto_drop_skcipher(&ictx->ctr);
|
|
err_drop_cipher:
|
|
crypto_drop_spawn(&ictx->cipher);
|
|
err_free_inst:
|
|
kfree(inst);
|
|
out_put_cipher:
|
|
inst = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
|
|
static struct crypto_instance *crypto_ccm_alloc(struct rtattr **tb)
|
|
{
|
|
int err;
|
|
const char *cipher_name;
|
|
char ctr_name[CRYPTO_MAX_ALG_NAME];
|
|
char full_name[CRYPTO_MAX_ALG_NAME];
|
|
|
|
cipher_name = crypto_attr_alg_name(tb[1]);
|
|
err = PTR_ERR(cipher_name);
|
|
if (IS_ERR(cipher_name))
|
|
return ERR_PTR(err);
|
|
|
|
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
|
|
cipher_name) >= CRYPTO_MAX_ALG_NAME)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
return crypto_ccm_alloc_common(tb, full_name, ctr_name, cipher_name);
|
|
}
|
|
|
|
static void crypto_ccm_free(struct crypto_instance *inst)
|
|
{
|
|
struct ccm_instance_ctx *ctx = crypto_instance_ctx(inst);
|
|
|
|
crypto_drop_spawn(&ctx->cipher);
|
|
crypto_drop_skcipher(&ctx->ctr);
|
|
kfree(inst);
|
|
}
|
|
|
|
static struct crypto_template crypto_ccm_tmpl = {
|
|
.name = "ccm",
|
|
.alloc = crypto_ccm_alloc,
|
|
.free = crypto_ccm_free,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static struct crypto_instance *crypto_ccm_base_alloc(struct rtattr **tb)
|
|
{
|
|
int err;
|
|
const char *ctr_name;
|
|
const char *cipher_name;
|
|
char full_name[CRYPTO_MAX_ALG_NAME];
|
|
|
|
ctr_name = crypto_attr_alg_name(tb[1]);
|
|
err = PTR_ERR(ctr_name);
|
|
if (IS_ERR(ctr_name))
|
|
return ERR_PTR(err);
|
|
|
|
cipher_name = crypto_attr_alg_name(tb[2]);
|
|
err = PTR_ERR(cipher_name);
|
|
if (IS_ERR(cipher_name))
|
|
return ERR_PTR(err);
|
|
|
|
if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)",
|
|
ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
return crypto_ccm_alloc_common(tb, full_name, ctr_name, cipher_name);
|
|
}
|
|
|
|
static struct crypto_template crypto_ccm_base_tmpl = {
|
|
.name = "ccm_base",
|
|
.alloc = crypto_ccm_base_alloc,
|
|
.free = crypto_ccm_free,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
|
|
struct crypto_aead *child = ctx->child;
|
|
int err;
|
|
|
|
if (keylen < 3)
|
|
return -EINVAL;
|
|
|
|
keylen -= 3;
|
|
memcpy(ctx->nonce, key + keylen, 3);
|
|
|
|
crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
|
|
crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
err = crypto_aead_setkey(child, key, keylen);
|
|
crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
|
|
CRYPTO_TFM_RES_MASK);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
|
|
unsigned int authsize)
|
|
{
|
|
struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
|
|
|
|
switch (authsize) {
|
|
case 8:
|
|
case 12:
|
|
case 16:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return crypto_aead_setauthsize(ctx->child, authsize);
|
|
}
|
|
|
|
static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
|
|
{
|
|
struct aead_request *subreq = aead_request_ctx(req);
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct crypto_aead *child = ctx->child;
|
|
u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
|
|
crypto_aead_alignmask(child) + 1);
|
|
|
|
/* L' */
|
|
iv[0] = 3;
|
|
|
|
memcpy(iv + 1, ctx->nonce, 3);
|
|
memcpy(iv + 4, req->iv, 8);
|
|
|
|
aead_request_set_tfm(subreq, child);
|
|
aead_request_set_callback(subreq, req->base.flags, req->base.complete,
|
|
req->base.data);
|
|
aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
|
|
aead_request_set_assoc(subreq, req->assoc, req->assoclen);
|
|
|
|
return subreq;
|
|
}
|
|
|
|
static int crypto_rfc4309_encrypt(struct aead_request *req)
|
|
{
|
|
req = crypto_rfc4309_crypt(req);
|
|
|
|
return crypto_aead_encrypt(req);
|
|
}
|
|
|
|
static int crypto_rfc4309_decrypt(struct aead_request *req)
|
|
{
|
|
req = crypto_rfc4309_crypt(req);
|
|
|
|
return crypto_aead_decrypt(req);
|
|
}
|
|
|
|
static int crypto_rfc4309_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
|
struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
|
|
struct crypto_rfc4309_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
struct crypto_aead *aead;
|
|
unsigned long align;
|
|
|
|
aead = crypto_spawn_aead(spawn);
|
|
if (IS_ERR(aead))
|
|
return PTR_ERR(aead);
|
|
|
|
ctx->child = aead;
|
|
|
|
align = crypto_aead_alignmask(aead);
|
|
align &= ~(crypto_tfm_ctx_alignment() - 1);
|
|
tfm->crt_aead.reqsize = sizeof(struct aead_request) +
|
|
ALIGN(crypto_aead_reqsize(aead),
|
|
crypto_tfm_ctx_alignment()) +
|
|
align + 16;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void crypto_rfc4309_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_rfc4309_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
crypto_free_aead(ctx->child);
|
|
}
|
|
|
|
static struct crypto_instance *crypto_rfc4309_alloc(struct rtattr **tb)
|
|
{
|
|
struct crypto_attr_type *algt;
|
|
struct crypto_instance *inst;
|
|
struct crypto_aead_spawn *spawn;
|
|
struct crypto_alg *alg;
|
|
const char *ccm_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);
|
|
|
|
ccm_name = crypto_attr_alg_name(tb[1]);
|
|
err = PTR_ERR(ccm_name);
|
|
if (IS_ERR(ccm_name))
|
|
return ERR_PTR(err);
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
spawn = crypto_instance_ctx(inst);
|
|
crypto_set_aead_spawn(spawn, inst);
|
|
err = crypto_grab_aead(spawn, ccm_name, 0,
|
|
crypto_requires_sync(algt->type, algt->mask));
|
|
if (err)
|
|
goto out_free_inst;
|
|
|
|
alg = crypto_aead_spawn_alg(spawn);
|
|
|
|
err = -EINVAL;
|
|
|
|
/* We only support 16-byte blocks. */
|
|
if (alg->cra_aead.ivsize != 16)
|
|
goto out_drop_alg;
|
|
|
|
/* Not a stream cipher? */
|
|
if (alg->cra_blocksize != 1)
|
|
goto out_drop_alg;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"rfc4309(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
|
|
snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"rfc4309(%s)", alg->cra_driver_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto out_drop_alg;
|
|
|
|
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
|
|
inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
|
|
inst->alg.cra_priority = alg->cra_priority;
|
|
inst->alg.cra_blocksize = 1;
|
|
inst->alg.cra_alignmask = alg->cra_alignmask;
|
|
inst->alg.cra_type = &crypto_nivaead_type;
|
|
|
|
inst->alg.cra_aead.ivsize = 8;
|
|
inst->alg.cra_aead.maxauthsize = 16;
|
|
|
|
inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
|
|
|
|
inst->alg.cra_init = crypto_rfc4309_init_tfm;
|
|
inst->alg.cra_exit = crypto_rfc4309_exit_tfm;
|
|
|
|
inst->alg.cra_aead.setkey = crypto_rfc4309_setkey;
|
|
inst->alg.cra_aead.setauthsize = crypto_rfc4309_setauthsize;
|
|
inst->alg.cra_aead.encrypt = crypto_rfc4309_encrypt;
|
|
inst->alg.cra_aead.decrypt = crypto_rfc4309_decrypt;
|
|
|
|
inst->alg.cra_aead.geniv = "seqiv";
|
|
|
|
out:
|
|
return inst;
|
|
|
|
out_drop_alg:
|
|
crypto_drop_aead(spawn);
|
|
out_free_inst:
|
|
kfree(inst);
|
|
inst = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
|
|
static void crypto_rfc4309_free(struct crypto_instance *inst)
|
|
{
|
|
crypto_drop_spawn(crypto_instance_ctx(inst));
|
|
kfree(inst);
|
|
}
|
|
|
|
static struct crypto_template crypto_rfc4309_tmpl = {
|
|
.name = "rfc4309",
|
|
.alloc = crypto_rfc4309_alloc,
|
|
.free = crypto_rfc4309_free,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init crypto_ccm_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = crypto_register_template(&crypto_ccm_base_tmpl);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = crypto_register_template(&crypto_ccm_tmpl);
|
|
if (err)
|
|
goto out_undo_base;
|
|
|
|
err = crypto_register_template(&crypto_rfc4309_tmpl);
|
|
if (err)
|
|
goto out_undo_ccm;
|
|
|
|
out:
|
|
return err;
|
|
|
|
out_undo_ccm:
|
|
crypto_unregister_template(&crypto_ccm_tmpl);
|
|
out_undo_base:
|
|
crypto_unregister_template(&crypto_ccm_base_tmpl);
|
|
goto out;
|
|
}
|
|
|
|
static void __exit crypto_ccm_module_exit(void)
|
|
{
|
|
crypto_unregister_template(&crypto_rfc4309_tmpl);
|
|
crypto_unregister_template(&crypto_ccm_tmpl);
|
|
crypto_unregister_template(&crypto_ccm_base_tmpl);
|
|
}
|
|
|
|
module_init(crypto_ccm_module_init);
|
|
module_exit(crypto_ccm_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Counter with CBC MAC");
|
|
MODULE_ALIAS("ccm_base");
|
|
MODULE_ALIAS("rfc4309");
|