![Eric Biggers](/assets/img/avatar_default.png)
The flag CRYPTO_ALG_ASYNC is "inherited" in the sense that when a template is instantiated, the template will have CRYPTO_ALG_ASYNC set if any of the algorithms it uses has CRYPTO_ALG_ASYNC set. We'd like to add a second flag (CRYPTO_ALG_ALLOCATES_MEMORY) that gets "inherited" in the same way. This is difficult because the handling of CRYPTO_ALG_ASYNC is hardcoded everywhere. Address this by: - Add CRYPTO_ALG_INHERITED_FLAGS, which contains the set of flags that have these inheritance semantics. - Add crypto_algt_inherited_mask(), for use by template ->create() methods. It returns any of these flags that the user asked to be unset and thus must be passed in the 'mask' to crypto_grab_*(). - Also modify crypto_check_attr_type() to handle computing the 'mask' so that most templates can just use this. - Make crypto_grab_*() propagate these flags to the template instance being created so that templates don't have to do this themselves. Make crypto/simd.c propagate these flags too, since it "wraps" another algorithm, similar to a template. Based on a patch by Mikulas Patocka <mpatocka@redhat.com> (https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
957 lines
23 KiB
C
957 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* CCM: Counter with CBC-MAC
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*
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* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
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*/
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#include <crypto/internal/aead.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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struct ccm_instance_ctx {
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struct crypto_skcipher_spawn ctr;
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struct crypto_ahash_spawn mac;
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};
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struct crypto_ccm_ctx {
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struct crypto_ahash *mac;
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struct crypto_skcipher *ctr;
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};
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struct crypto_rfc4309_ctx {
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struct crypto_aead *child;
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u8 nonce[3];
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};
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struct crypto_rfc4309_req_ctx {
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struct scatterlist src[3];
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struct scatterlist dst[3];
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struct aead_request subreq;
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};
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struct crypto_ccm_req_priv_ctx {
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u8 odata[16];
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u8 idata[16];
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u8 auth_tag[16];
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u32 flags;
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struct scatterlist src[3];
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struct scatterlist dst[3];
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union {
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struct ahash_request ahreq;
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struct skcipher_request skreq;
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};
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};
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struct cbcmac_tfm_ctx {
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struct crypto_cipher *child;
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};
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struct cbcmac_desc_ctx {
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unsigned int len;
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};
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static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx(
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struct aead_request *req)
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{
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unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
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return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
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}
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static int set_msg_len(u8 *block, unsigned int msglen, int csize)
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{
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__be32 data;
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memset(block, 0, csize);
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block += csize;
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if (csize >= 4)
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csize = 4;
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else if (msglen > (1 << (8 * csize)))
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return -EOVERFLOW;
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data = cpu_to_be32(msglen);
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memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
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return 0;
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}
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static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
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struct crypto_skcipher *ctr = ctx->ctr;
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struct crypto_ahash *mac = ctx->mac;
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int err;
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crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(ctr, key, keylen);
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if (err)
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return err;
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crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK);
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crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) &
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CRYPTO_TFM_REQ_MASK);
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return crypto_ahash_setkey(mac, key, keylen);
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}
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static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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switch (authsize) {
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case 4:
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case 6:
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case 8:
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case 10:
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case 12:
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case 14:
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case 16:
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int format_input(u8 *info, struct aead_request *req,
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unsigned int cryptlen)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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unsigned int lp = req->iv[0];
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unsigned int l = lp + 1;
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unsigned int m;
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m = crypto_aead_authsize(aead);
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memcpy(info, req->iv, 16);
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/* format control info per RFC 3610 and
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* NIST Special Publication 800-38C
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*/
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*info |= (8 * ((m - 2) / 2));
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if (req->assoclen)
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*info |= 64;
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return set_msg_len(info + 16 - l, cryptlen, l);
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}
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static int format_adata(u8 *adata, unsigned int a)
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{
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int len = 0;
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/* add control info for associated data
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* RFC 3610 and NIST Special Publication 800-38C
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*/
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if (a < 65280) {
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*(__be16 *)adata = cpu_to_be16(a);
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len = 2;
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} else {
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*(__be16 *)adata = cpu_to_be16(0xfffe);
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*(__be32 *)&adata[2] = cpu_to_be32(a);
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len = 6;
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}
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return len;
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}
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static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
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unsigned int cryptlen)
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{
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struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
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struct ahash_request *ahreq = &pctx->ahreq;
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unsigned int assoclen = req->assoclen;
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struct scatterlist sg[3];
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u8 *odata = pctx->odata;
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u8 *idata = pctx->idata;
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int ilen, err;
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/* format control data for input */
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err = format_input(odata, req, cryptlen);
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if (err)
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goto out;
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sg_init_table(sg, 3);
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sg_set_buf(&sg[0], odata, 16);
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/* format associated data and compute into mac */
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if (assoclen) {
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ilen = format_adata(idata, assoclen);
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sg_set_buf(&sg[1], idata, ilen);
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sg_chain(sg, 3, req->src);
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} else {
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ilen = 0;
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sg_chain(sg, 2, req->src);
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}
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ahash_request_set_tfm(ahreq, ctx->mac);
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ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL);
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ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16);
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err = crypto_ahash_init(ahreq);
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if (err)
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goto out;
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err = crypto_ahash_update(ahreq);
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if (err)
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goto out;
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/* we need to pad the MAC input to a round multiple of the block size */
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ilen = 16 - (assoclen + ilen) % 16;
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if (ilen < 16) {
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memset(idata, 0, ilen);
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sg_init_table(sg, 2);
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sg_set_buf(&sg[0], idata, ilen);
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if (plain)
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sg_chain(sg, 2, plain);
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plain = sg;
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cryptlen += ilen;
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}
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ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen);
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err = crypto_ahash_finup(ahreq);
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out:
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return err;
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}
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static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
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{
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struct aead_request *req = areq->data;
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
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u8 *odata = pctx->odata;
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if (!err)
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scatterwalk_map_and_copy(odata, req->dst,
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req->assoclen + req->cryptlen,
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crypto_aead_authsize(aead), 1);
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aead_request_complete(req, err);
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}
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static inline int crypto_ccm_check_iv(const u8 *iv)
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{
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/* 2 <= L <= 8, so 1 <= L' <= 7. */
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if (1 > iv[0] || iv[0] > 7)
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return -EINVAL;
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return 0;
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}
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static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag)
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{
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struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
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struct scatterlist *sg;
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u8 *iv = req->iv;
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int err;
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err = crypto_ccm_check_iv(iv);
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if (err)
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return err;
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pctx->flags = aead_request_flags(req);
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/* Note: rfc 3610 and NIST 800-38C require counter of
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* zero to encrypt auth tag.
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*/
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memset(iv + 15 - iv[0], 0, iv[0] + 1);
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sg_init_table(pctx->src, 3);
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sg_set_buf(pctx->src, tag, 16);
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sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
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if (sg != pctx->src + 1)
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sg_chain(pctx->src, 2, sg);
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if (req->src != req->dst) {
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sg_init_table(pctx->dst, 3);
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sg_set_buf(pctx->dst, tag, 16);
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sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
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if (sg != pctx->dst + 1)
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sg_chain(pctx->dst, 2, sg);
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}
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return 0;
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}
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static int crypto_ccm_encrypt(struct aead_request *req)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
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struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
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struct skcipher_request *skreq = &pctx->skreq;
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struct scatterlist *dst;
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unsigned int cryptlen = req->cryptlen;
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u8 *odata = pctx->odata;
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u8 *iv = req->iv;
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int err;
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err = crypto_ccm_init_crypt(req, odata);
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if (err)
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return err;
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err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen);
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if (err)
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return err;
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dst = pctx->src;
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if (req->src != req->dst)
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dst = pctx->dst;
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skcipher_request_set_tfm(skreq, ctx->ctr);
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skcipher_request_set_callback(skreq, pctx->flags,
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crypto_ccm_encrypt_done, req);
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skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
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err = crypto_skcipher_encrypt(skreq);
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if (err)
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return err;
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/* copy authtag to end of dst */
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scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,
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crypto_aead_authsize(aead), 1);
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return err;
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}
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static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
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int err)
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{
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struct aead_request *req = areq->data;
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struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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unsigned int authsize = crypto_aead_authsize(aead);
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unsigned int cryptlen = req->cryptlen - authsize;
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struct scatterlist *dst;
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pctx->flags = 0;
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dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
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if (!err) {
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err = crypto_ccm_auth(req, dst, cryptlen);
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if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
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err = -EBADMSG;
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}
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aead_request_complete(req, err);
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}
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static int crypto_ccm_decrypt(struct aead_request *req)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
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struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
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struct skcipher_request *skreq = &pctx->skreq;
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struct scatterlist *dst;
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unsigned int authsize = crypto_aead_authsize(aead);
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unsigned int cryptlen = req->cryptlen;
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u8 *authtag = pctx->auth_tag;
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u8 *odata = pctx->odata;
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u8 *iv = pctx->idata;
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int err;
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cryptlen -= authsize;
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err = crypto_ccm_init_crypt(req, authtag);
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if (err)
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return err;
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scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen,
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authsize, 0);
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dst = pctx->src;
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if (req->src != req->dst)
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dst = pctx->dst;
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memcpy(iv, req->iv, 16);
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skcipher_request_set_tfm(skreq, ctx->ctr);
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skcipher_request_set_callback(skreq, pctx->flags,
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crypto_ccm_decrypt_done, req);
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skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
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err = crypto_skcipher_decrypt(skreq);
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if (err)
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return err;
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err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
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if (err)
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return err;
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/* verify */
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if (crypto_memneq(authtag, odata, authsize))
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return -EBADMSG;
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return err;
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}
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static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
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{
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struct aead_instance *inst = aead_alg_instance(tfm);
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struct ccm_instance_ctx *ictx = aead_instance_ctx(inst);
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struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
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struct crypto_ahash *mac;
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struct crypto_skcipher *ctr;
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unsigned long align;
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int err;
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mac = crypto_spawn_ahash(&ictx->mac);
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if (IS_ERR(mac))
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return PTR_ERR(mac);
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ctr = crypto_spawn_skcipher(&ictx->ctr);
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err = PTR_ERR(ctr);
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if (IS_ERR(ctr))
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goto err_free_mac;
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ctx->mac = mac;
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ctx->ctr = ctr;
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align = crypto_aead_alignmask(tfm);
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align &= ~(crypto_tfm_ctx_alignment() - 1);
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crypto_aead_set_reqsize(
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tfm,
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align + sizeof(struct crypto_ccm_req_priv_ctx) +
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max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr)));
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return 0;
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err_free_mac:
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crypto_free_ahash(mac);
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return err;
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}
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static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
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{
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struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
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crypto_free_ahash(ctx->mac);
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crypto_free_skcipher(ctx->ctr);
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}
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static void crypto_ccm_free(struct aead_instance *inst)
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{
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struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
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crypto_drop_ahash(&ctx->mac);
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crypto_drop_skcipher(&ctx->ctr);
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kfree(inst);
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}
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static int crypto_ccm_create_common(struct crypto_template *tmpl,
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struct rtattr **tb,
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const char *ctr_name,
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const char *mac_name)
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{
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u32 mask;
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struct aead_instance *inst;
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struct ccm_instance_ctx *ictx;
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struct skcipher_alg *ctr;
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struct hash_alg_common *mac;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
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if (err)
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return err;
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inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
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if (!inst)
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return -ENOMEM;
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ictx = aead_instance_ctx(inst);
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err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst),
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mac_name, 0, mask | CRYPTO_ALG_ASYNC);
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if (err)
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goto err_free_inst;
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mac = crypto_spawn_ahash_alg(&ictx->mac);
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err = -EINVAL;
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if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 ||
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mac->digestsize != 16)
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goto err_free_inst;
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err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst),
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ctr_name, 0, mask);
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if (err)
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goto err_free_inst;
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ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
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/* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
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err = -EINVAL;
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if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
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crypto_skcipher_alg_ivsize(ctr) != 16 ||
|
|
ctr->base.cra_blocksize != 1)
|
|
goto err_free_inst;
|
|
|
|
/* ctr and cbcmac must use the same underlying block cipher. */
|
|
if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0)
|
|
goto err_free_inst;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
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_free_inst;
|
|
|
|
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) {
|
|
err_free_inst:
|
|
crypto_ccm_free(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
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];
|
|
|
|
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;
|
|
|
|
return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
|
|
}
|
|
|
|
static int crypto_ccm_base_create(struct crypto_template *tmpl,
|
|
struct rtattr **tb)
|
|
{
|
|
const char *ctr_name;
|
|
const char *mac_name;
|
|
|
|
ctr_name = crypto_attr_alg_name(tb[1]);
|
|
if (IS_ERR(ctr_name))
|
|
return PTR_ERR(ctr_name);
|
|
|
|
mac_name = crypto_attr_alg_name(tb[2]);
|
|
if (IS_ERR(mac_name))
|
|
return PTR_ERR(mac_name);
|
|
|
|
return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
|
|
}
|
|
|
|
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;
|
|
|
|
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);
|
|
return crypto_aead_setkey(child, key, keylen);
|
|
}
|
|
|
|
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 crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req);
|
|
struct aead_request *subreq = &rctx->subreq;
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
|
struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct crypto_aead *child = ctx->child;
|
|
struct scatterlist *sg;
|
|
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);
|
|
|
|
scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
|
|
|
|
sg_init_table(rctx->src, 3);
|
|
sg_set_buf(rctx->src, iv + 16, req->assoclen - 8);
|
|
sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
|
|
if (sg != rctx->src + 1)
|
|
sg_chain(rctx->src, 2, sg);
|
|
|
|
if (req->src != req->dst) {
|
|
sg_init_table(rctx->dst, 3);
|
|
sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8);
|
|
sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
|
|
if (sg != rctx->dst + 1)
|
|
sg_chain(rctx->dst, 2, sg);
|
|
}
|
|
|
|
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, rctx->src,
|
|
req->src == req->dst ? rctx->src : rctx->dst,
|
|
req->cryptlen, iv);
|
|
aead_request_set_ad(subreq, req->assoclen - 8);
|
|
|
|
return subreq;
|
|
}
|
|
|
|
static int crypto_rfc4309_encrypt(struct aead_request *req)
|
|
{
|
|
if (req->assoclen != 16 && req->assoclen != 20)
|
|
return -EINVAL;
|
|
|
|
req = crypto_rfc4309_crypt(req);
|
|
|
|
return crypto_aead_encrypt(req);
|
|
}
|
|
|
|
static int crypto_rfc4309_decrypt(struct aead_request *req)
|
|
{
|
|
if (req->assoclen != 16 && req->assoclen != 20)
|
|
return -EINVAL;
|
|
|
|
req = crypto_rfc4309_crypt(req);
|
|
|
|
return crypto_aead_decrypt(req);
|
|
}
|
|
|
|
static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
|
|
{
|
|
struct aead_instance *inst = aead_alg_instance(tfm);
|
|
struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
|
|
struct crypto_rfc4309_ctx *ctx = crypto_aead_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);
|
|
crypto_aead_set_reqsize(
|
|
tfm,
|
|
sizeof(struct crypto_rfc4309_req_ctx) +
|
|
ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
|
|
align + 32);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
|
|
{
|
|
struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
|
|
|
|
crypto_free_aead(ctx->child);
|
|
}
|
|
|
|
static void crypto_rfc4309_free(struct aead_instance *inst)
|
|
{
|
|
crypto_drop_aead(aead_instance_ctx(inst));
|
|
kfree(inst);
|
|
}
|
|
|
|
static int crypto_rfc4309_create(struct crypto_template *tmpl,
|
|
struct rtattr **tb)
|
|
{
|
|
u32 mask;
|
|
struct aead_instance *inst;
|
|
struct crypto_aead_spawn *spawn;
|
|
struct aead_alg *alg;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
|
|
if (err)
|
|
return err;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return -ENOMEM;
|
|
|
|
spawn = aead_instance_ctx(inst);
|
|
err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
|
|
crypto_attr_alg_name(tb[1]), 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
alg = crypto_spawn_aead_alg(spawn);
|
|
|
|
err = -EINVAL;
|
|
|
|
/* We only support 16-byte blocks. */
|
|
if (crypto_aead_alg_ivsize(alg) != 16)
|
|
goto err_free_inst;
|
|
|
|
/* Not a stream cipher? */
|
|
if (alg->base.cra_blocksize != 1)
|
|
goto err_free_inst;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"rfc4309(%s)", alg->base.cra_name) >=
|
|
CRYPTO_MAX_ALG_NAME ||
|
|
snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"rfc4309(%s)", alg->base.cra_driver_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
inst->alg.base.cra_priority = alg->base.cra_priority;
|
|
inst->alg.base.cra_blocksize = 1;
|
|
inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
|
|
|
|
inst->alg.ivsize = 8;
|
|
inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
|
|
inst->alg.maxauthsize = 16;
|
|
|
|
inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
|
|
|
|
inst->alg.init = crypto_rfc4309_init_tfm;
|
|
inst->alg.exit = crypto_rfc4309_exit_tfm;
|
|
|
|
inst->alg.setkey = crypto_rfc4309_setkey;
|
|
inst->alg.setauthsize = crypto_rfc4309_setauthsize;
|
|
inst->alg.encrypt = crypto_rfc4309_encrypt;
|
|
inst->alg.decrypt = crypto_rfc4309_decrypt;
|
|
|
|
inst->free = crypto_rfc4309_free;
|
|
|
|
err = aead_register_instance(tmpl, inst);
|
|
if (err) {
|
|
err_free_inst:
|
|
crypto_rfc4309_free(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
|
|
const u8 *inkey, unsigned int keylen)
|
|
{
|
|
struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
|
|
|
|
return crypto_cipher_setkey(ctx->child, inkey, keylen);
|
|
}
|
|
|
|
static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
|
|
{
|
|
struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
|
|
int bs = crypto_shash_digestsize(pdesc->tfm);
|
|
u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs;
|
|
|
|
ctx->len = 0;
|
|
memset(dg, 0, bs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
|
|
unsigned int len)
|
|
{
|
|
struct crypto_shash *parent = pdesc->tfm;
|
|
struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
|
|
struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
|
|
struct crypto_cipher *tfm = tctx->child;
|
|
int bs = crypto_shash_digestsize(parent);
|
|
u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
|
|
|
|
while (len > 0) {
|
|
unsigned int l = min(len, bs - ctx->len);
|
|
|
|
crypto_xor(dg + ctx->len, p, l);
|
|
ctx->len +=l;
|
|
len -= l;
|
|
p += l;
|
|
|
|
if (ctx->len == bs) {
|
|
crypto_cipher_encrypt_one(tfm, dg, dg);
|
|
ctx->len = 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
|
|
{
|
|
struct crypto_shash *parent = pdesc->tfm;
|
|
struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
|
|
struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
|
|
struct crypto_cipher *tfm = tctx->child;
|
|
int bs = crypto_shash_digestsize(parent);
|
|
u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
|
|
|
|
if (ctx->len)
|
|
crypto_cipher_encrypt_one(tfm, dg, dg);
|
|
|
|
memcpy(out, dg, bs);
|
|
return 0;
|
|
}
|
|
|
|
static int cbcmac_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_cipher *cipher;
|
|
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
|
struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
|
|
struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
cipher = crypto_spawn_cipher(spawn);
|
|
if (IS_ERR(cipher))
|
|
return PTR_ERR(cipher);
|
|
|
|
ctx->child = cipher;
|
|
|
|
return 0;
|
|
};
|
|
|
|
static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
crypto_free_cipher(ctx->child);
|
|
}
|
|
|
|
static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
|
|
{
|
|
struct shash_instance *inst;
|
|
struct crypto_cipher_spawn *spawn;
|
|
struct crypto_alg *alg;
|
|
u32 mask;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
|
|
if (err)
|
|
return err;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return -ENOMEM;
|
|
spawn = shash_instance_ctx(inst);
|
|
|
|
err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
|
|
crypto_attr_alg_name(tb[1]), 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
alg = crypto_spawn_cipher_alg(spawn);
|
|
|
|
err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
inst->alg.base.cra_priority = alg->cra_priority;
|
|
inst->alg.base.cra_blocksize = 1;
|
|
|
|
inst->alg.digestsize = alg->cra_blocksize;
|
|
inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
|
|
alg->cra_alignmask + 1) +
|
|
alg->cra_blocksize;
|
|
|
|
inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx);
|
|
inst->alg.base.cra_init = cbcmac_init_tfm;
|
|
inst->alg.base.cra_exit = cbcmac_exit_tfm;
|
|
|
|
inst->alg.init = crypto_cbcmac_digest_init;
|
|
inst->alg.update = crypto_cbcmac_digest_update;
|
|
inst->alg.final = crypto_cbcmac_digest_final;
|
|
inst->alg.setkey = crypto_cbcmac_digest_setkey;
|
|
|
|
inst->free = shash_free_singlespawn_instance;
|
|
|
|
err = shash_register_instance(tmpl, inst);
|
|
if (err) {
|
|
err_free_inst:
|
|
shash_free_singlespawn_instance(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct crypto_template crypto_ccm_tmpls[] = {
|
|
{
|
|
.name = "cbcmac",
|
|
.create = cbcmac_create,
|
|
.module = THIS_MODULE,
|
|
}, {
|
|
.name = "ccm_base",
|
|
.create = crypto_ccm_base_create,
|
|
.module = THIS_MODULE,
|
|
}, {
|
|
.name = "ccm",
|
|
.create = crypto_ccm_create,
|
|
.module = THIS_MODULE,
|
|
}, {
|
|
.name = "rfc4309",
|
|
.create = crypto_rfc4309_create,
|
|
.module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init crypto_ccm_module_init(void)
|
|
{
|
|
return crypto_register_templates(crypto_ccm_tmpls,
|
|
ARRAY_SIZE(crypto_ccm_tmpls));
|
|
}
|
|
|
|
static void __exit crypto_ccm_module_exit(void)
|
|
{
|
|
crypto_unregister_templates(crypto_ccm_tmpls,
|
|
ARRAY_SIZE(crypto_ccm_tmpls));
|
|
}
|
|
|
|
subsys_initcall(crypto_ccm_module_init);
|
|
module_exit(crypto_ccm_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Counter with CBC MAC");
|
|
MODULE_ALIAS_CRYPTO("ccm_base");
|
|
MODULE_ALIAS_CRYPTO("rfc4309");
|
|
MODULE_ALIAS_CRYPTO("ccm");
|
|
MODULE_ALIAS_CRYPTO("cbcmac");
|