Release 4.11 crypto/ccm.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/hash.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_ahash_spawn mac;
};
struct crypto_ccm_ctx {
struct crypto_ahash *mac;
struct crypto_skcipher *ctr;
};
struct crypto_rfc4309_ctx {
struct crypto_aead *child;
u8 nonce[3];
};
struct crypto_rfc4309_req_ctx {
struct scatterlist src[3];
struct scatterlist dst[3];
struct aead_request subreq;
};
struct crypto_ccm_req_priv_ctx {
u8 odata[16];
u8 idata[16];
u8 auth_tag[16];
u32 flags;
struct scatterlist src[3];
struct scatterlist dst[3];
struct skcipher_request skreq;
};
struct cbcmac_tfm_ctx {
struct crypto_cipher *child;
};
struct cbcmac_desc_ctx {
unsigned int len;
};
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);
}
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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;
}
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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_skcipher *ctr = ctx->ctr;
struct crypto_ahash *mac = ctx->mac;
int err = 0;
crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
CRYPTO_TFM_REQ_MASK);
err = crypto_skcipher_setkey(ctr, key, keylen);
crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
CRYPTO_TFM_RES_MASK);
if (err)
goto out;
crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK);
crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) &
CRYPTO_TFM_REQ_MASK);
err = crypto_ahash_setkey(mac, key, keylen);
crypto_aead_set_flags(aead, crypto_ahash_get_flags(mac) &
CRYPTO_TFM_RES_MASK);
out:
return err;
}
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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;
}
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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);
}
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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;
}
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static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
unsigned int cryptlen)
{
struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
AHASH_REQUEST_ON_STACK(ahreq, ctx->mac);
unsigned int assoclen = req->assoclen;
struct scatterlist sg[3];
u8 *odata = pctx->odata;
u8 *idata = pctx->idata;
int ilen, err;
/* format control data for input */
err = format_input(odata, req, cryptlen);
if (err)
goto out;
sg_init_table(sg, 3);
sg_set_buf(&sg[0], odata, 16);
/* format associated data and compute into mac */
if (assoclen) {
ilen = format_adata(idata, assoclen);
sg_set_buf(&sg[1], idata, ilen);
sg_chain(sg, 3, req->src);
} else {
ilen = 0;
sg_chain(sg, 2, req->src);
}
ahash_request_set_tfm(ahreq, ctx->mac);
ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL);
ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16);
err = crypto_ahash_init(ahreq);
if (err)
goto out;
err = crypto_ahash_update(ahreq);
if (err)
goto out;
/* we need to pad the MAC input to a round multiple of the block size */
ilen = 16 - (assoclen + ilen) % 16;
if (ilen < 16) {
memset(idata, 0, ilen);
sg_init_table(sg, 2);
sg_set_buf(&sg[0], idata, ilen);
if (plain)
sg_chain(sg, 2, plain);
plain = sg;
cryptlen += ilen;
}
ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen);
err = crypto_ahash_finup(ahreq);
out:
return err;
}
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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->assoclen + req->cryptlen,
crypto_aead_authsize(aead), 1);
aead_request_complete(req, err);
}
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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;
}
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static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag)
{
struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
struct scatterlist *sg;
u8 *iv = req->iv;
int err;
err = crypto_ccm_check_iv(iv);
if (err)
return err;
pctx->flags = aead_request_flags(req);
/* 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, 3);
sg_set_buf(pctx->src, tag, 16);
sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
if (sg != pctx->src + 1)
sg_chain(pctx->src, 2, sg);
if (req->src != req->dst) {
sg_init_table(pctx->dst, 3);
sg_set_buf(pctx->dst, tag, 16);
sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
if (sg != pctx->dst + 1)
sg_chain(pctx->dst, 2, sg);
}
return 0;
}
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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 skcipher_request *skreq = &pctx->skreq;
struct scatterlist *dst;
unsigned int cryptlen = req->cryptlen;
u8 *odata = pctx->odata;
u8 *iv = req->iv;
int err;
err = crypto_ccm_init_crypt(req, odata);
if (err)
return err;
err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen);
if (err)
return err;
dst = pctx->src;
if (req->src != req->dst)
dst = pctx->dst;
skcipher_request_set_tfm(skreq, ctx->ctr);
skcipher_request_set_callback(skreq, pctx->flags,
crypto_ccm_encrypt_done, req);
skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
err = crypto_skcipher_encrypt(skreq);
if (err)
return err;
/* copy authtag to end of dst */
scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,
crypto_aead_authsize(aead), 1);
return err;
}
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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;
struct scatterlist *dst;
pctx->flags = 0;
dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
if (!err) {
err = crypto_ccm_auth(req, dst, cryptlen);
if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
err = -EBADMSG;
}
aead_request_complete(req, err);
}
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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 skcipher_request *skreq = &pctx->skreq;
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;
cryptlen -= authsize;
err = crypto_ccm_init_crypt(req, authtag);
if (err)
return err;
scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen,
authsize, 0);
dst = pctx->src;
if (req->src != req->dst)
dst = pctx->dst;
skcipher_request_set_tfm(skreq, ctx->ctr);
skcipher_request_set_callback(skreq, pctx->flags,
crypto_ccm_decrypt_done, req);
skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
err = crypto_skcipher_decrypt(skreq);
if (err)
return err;
err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
if (err)
return err;
/* verify */
if (crypto_memneq(authtag, odata, authsize))
return -EBADMSG;
return err;
}
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static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
{
struct aead_instance *inst = aead_alg_instance(tfm);
struct ccm_instance_ctx *ictx = aead_instance_ctx(inst);
struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_ahash *mac;
struct crypto_skcipher *ctr;
unsigned long align;
int err;
mac = crypto_spawn_ahash(&ictx->mac);
if (IS_ERR(mac))
return PTR_ERR(mac);
ctr = crypto_spawn_skcipher(&ictx->ctr);
err = PTR_ERR(ctr);
if (IS_ERR(ctr))
goto err_free_mac;
ctx->mac = mac;
ctx->ctr = ctr;
align = crypto_aead_alignmask(tfm);
align &= ~(crypto_tfm_ctx_alignment() - 1);
crypto_aead_set_reqsize(
tfm,
align + sizeof(struct crypto_ccm_req_priv_ctx) +
crypto_skcipher_reqsize(ctr));
return 0;
err_free_mac:
crypto_free_ahash(mac);
return err;
}
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static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
{
struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
crypto_free_ahash(ctx->mac);
crypto_free_skcipher(ctx->ctr);
}
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static void crypto_ccm_free(struct aead_instance *inst)
{
struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
crypto_drop_ahash(&ctx->mac);
crypto_drop_skcipher(&ctx->ctr);
kfree(inst);
}
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static int crypto_ccm_create_common(struct crypto_template *tmpl,
struct rtattr **tb,
const char *full_name,
const char *ctr_name,
const char *mac_name)
{
struct crypto_attr_type *algt;
struct aead_instance *inst;
struct skcipher_alg *ctr;
struct crypto_alg *mac_alg;
struct hash_alg_common *mac;
struct ccm_instance_ctx *ictx;
int err;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return PTR_ERR(algt);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return -EINVAL;
mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type,
CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK |
CRYPTO_ALG_ASYNC);
if (IS_ERR(mac_alg))
return PTR_ERR(mac_alg);
mac = __crypto_hash_alg_common(mac_alg);
err = -EINVAL;
if (mac->digestsize != 16)
goto out_put_mac;
inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
err = -ENOMEM;
if (!inst)
goto out_put_mac;
ictx = aead_instance_ctx(inst);
err = crypto_init_ahash_spawn(&ictx->mac, mac,
aead_crypto_instance(inst));
if (err)
goto err_free_inst;
crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst));
err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
if (err)
goto err_drop_mac;
ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
/* Not a stream cipher? */
err = -EINVAL;
if (ctr->base.cra_blocksize != 1)
goto err_drop_ctr;
/* We want the real thing! */
if (crypto_skcipher_alg_ivsize(ctr) != 16)
goto err_drop_ctr;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"ccm_base(%s,%s)", ctr->base.cra_driver_name,
mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_drop_ctr;
memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.base.cra_priority = (mac->base.cra_priority +
ctr->base.cra_priority) / 2;
inst->alg.base.cra_blocksize = 1;
inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
ctr->base.cra_alignmask;
inst->alg.ivsize = 16;
inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
inst->alg.maxauthsize = 16;
inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
inst->alg.init = crypto_ccm_init_tfm;
inst->alg.exit = crypto_ccm_exit_tfm;
inst->alg.setkey = crypto_ccm_setkey;
inst->alg.setauthsize = crypto_ccm_setauthsize;
inst->alg.encrypt = crypto_ccm_encrypt;
inst->alg.decrypt = crypto_ccm_decrypt;
inst->free = crypto_ccm_free;
err = aead_register_instance(tmpl, inst);
if (err)
goto err_drop_ctr;
out_put_mac:
crypto_mod_put(mac_alg);
return err;
err_drop_ctr:
crypto_drop_skcipher(&ictx->ctr);
err_drop_mac:
crypto_drop_ahash(&ictx->mac);
err_free_inst:
kfree(inst);
goto out_put_mac;
}
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Total | 580 | 100.00% | 6 | 100.00% |
static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
{
const char *cipher_name;
char ctr_name[CRYPTO_MAX_ALG_NAME];
char mac_name[CRYPTO_MAX_ALG_NAME];
char full_name[CRYPTO_MAX_ALG_NAME];
cipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(cipher_name))
return PTR_ERR(cipher_name);
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
cipher_name) >= CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
cipher_name) >= CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >=
CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name,
mac_name);
}
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static struct crypto_template crypto_ccm_tmpl = {
.name = "ccm",
.create = crypto_ccm_create,
.module = THIS_MODULE,
};
static int crypto_ccm_base_create(struct crypto_template *tmpl,
struct rtattr **tb)
{
const char *ctr_name;
const char *cipher_name;
char full_name[CRYPTO_MAX_ALG_NAME];
ctr_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(ctr_name))
return PTR_ERR(ctr_name);
cipher_name = crypto_attr_alg_name(tb[2]);
if (IS_ERR(cipher_name))
return PTR_ERR(cipher_name);
if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)",
ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name,
cipher_name);
}
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static struct crypto_template crypto_ccm_base_tmpl = {
.name = "ccm_base",
.create = crypto_ccm_base_create,
.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