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![Joy Latten](/assets/img/avatar_default.png)
This patch adds Counter with CBC-MAC (CCM) support. RFC 3610 and NIST Special Publication 800-38C were referenced. Signed-off-by: Joy Latten <latten@austin.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
889 lines
22 KiB
C
889 lines
22 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/aead.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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#include "internal.h"
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struct ccm_instance_ctx {
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struct crypto_skcipher_spawn ctr;
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struct crypto_spawn cipher;
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};
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struct crypto_ccm_ctx {
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struct crypto_cipher *cipher;
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struct crypto_ablkcipher *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_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 ilen;
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u32 flags;
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struct scatterlist src[2];
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struct scatterlist dst[2];
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struct ablkcipher_request abreq;
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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_ablkcipher *ctr = ctx->ctr;
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struct crypto_cipher *tfm = ctx->cipher;
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int err = 0;
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crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
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crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_ablkcipher_setkey(ctr, key, keylen);
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crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
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CRYPTO_TFM_RES_MASK);
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if (err)
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goto out;
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crypto_cipher_clear_flags(tfm, CRYPTO_TFM_REQ_MASK);
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crypto_cipher_set_flags(tfm, crypto_aead_get_flags(aead) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_cipher_setkey(tfm, key, keylen);
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crypto_aead_set_flags(aead, crypto_cipher_get_flags(tfm) &
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CRYPTO_TFM_RES_MASK);
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out:
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return err;
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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 void compute_mac(struct crypto_cipher *tfm, u8 *data, int n,
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struct crypto_ccm_req_priv_ctx *pctx)
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{
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unsigned int bs = 16;
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u8 *odata = pctx->odata;
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u8 *idata = pctx->idata;
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int datalen, getlen;
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datalen = n;
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/* first time in here, block may be partially filled. */
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getlen = bs - pctx->ilen;
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if (datalen >= getlen) {
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memcpy(idata + pctx->ilen, data, getlen);
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crypto_xor(odata, idata, bs);
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crypto_cipher_encrypt_one(tfm, odata, odata);
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datalen -= getlen;
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data += getlen;
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pctx->ilen = 0;
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}
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/* now encrypt rest of data */
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while (datalen >= bs) {
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crypto_xor(odata, data, bs);
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crypto_cipher_encrypt_one(tfm, odata, odata);
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datalen -= bs;
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data += bs;
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}
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/* check and see if there's leftover data that wasn't
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* enough to fill a block.
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*/
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if (datalen) {
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memcpy(idata + pctx->ilen, data, datalen);
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pctx->ilen += datalen;
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}
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}
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static void get_data_to_compute(struct crypto_cipher *tfm,
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struct crypto_ccm_req_priv_ctx *pctx,
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struct scatterlist *sg, unsigned int len)
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{
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struct scatter_walk walk;
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u8 *data_src;
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int n;
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scatterwalk_start(&walk, sg);
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while (len) {
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n = scatterwalk_clamp(&walk, len);
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if (!n) {
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scatterwalk_start(&walk, sg_next(walk.sg));
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n = scatterwalk_clamp(&walk, len);
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}
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data_src = scatterwalk_map(&walk, 0);
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compute_mac(tfm, data_src, n, pctx);
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len -= n;
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scatterwalk_unmap(data_src, 0);
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scatterwalk_advance(&walk, n);
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scatterwalk_done(&walk, 0, len);
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if (len)
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crypto_yield(pctx->flags);
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}
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/* any leftover needs padding and then encrypted */
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if (pctx->ilen) {
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int padlen;
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u8 *odata = pctx->odata;
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u8 *idata = pctx->idata;
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padlen = 16 - pctx->ilen;
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memset(idata + pctx->ilen, 0, padlen);
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crypto_xor(odata, idata, 16);
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crypto_cipher_encrypt_one(tfm, odata, odata);
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pctx->ilen = 0;
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}
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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_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 crypto_cipher *cipher = ctx->cipher;
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unsigned int assoclen = req->assoclen;
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u8 *odata = pctx->odata;
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u8 *idata = pctx->idata;
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int 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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/* encrypt first block to use as start in computing mac */
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crypto_cipher_encrypt_one(cipher, odata, odata);
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/* format associated data and compute into mac */
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if (assoclen) {
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pctx->ilen = format_adata(idata, assoclen);
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get_data_to_compute(cipher, pctx, req->assoc, req->assoclen);
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}
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/* compute plaintext into mac */
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get_data_to_compute(cipher, pctx, plain, cryptlen);
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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, 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_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 ablkcipher_request *abreq = &pctx->abreq;
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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_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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err = crypto_ccm_auth(req, req->src, cryptlen);
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if (err)
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return err;
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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, 2);
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sg_set_buf(pctx->src, odata, 16);
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scatterwalk_sg_chain(pctx->src, 2, req->src);
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dst = pctx->src;
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if (req->src != req->dst) {
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sg_init_table(pctx->dst, 2);
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sg_set_buf(pctx->dst, odata, 16);
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scatterwalk_sg_chain(pctx->dst, 2, req->dst);
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dst = pctx->dst;
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}
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ablkcipher_request_set_tfm(abreq, ctx->ctr);
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ablkcipher_request_set_callback(abreq, pctx->flags,
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crypto_ccm_encrypt_done, req);
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ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv);
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err = crypto_ablkcipher_encrypt(abreq);
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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, req->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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if (!err) {
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err = crypto_ccm_auth(req, req->dst, cryptlen);
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if (!err && memcmp(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 ablkcipher_request *abreq = &pctx->abreq;
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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 = req->iv;
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int err;
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if (cryptlen < authsize)
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return -EINVAL;
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cryptlen -= authsize;
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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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scatterwalk_map_and_copy(authtag, req->src, cryptlen, authsize, 0);
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memset(iv + 15 - iv[0], 0, iv[0] + 1);
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sg_init_table(pctx->src, 2);
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sg_set_buf(pctx->src, authtag, 16);
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scatterwalk_sg_chain(pctx->src, 2, req->src);
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dst = pctx->src;
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if (req->src != req->dst) {
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sg_init_table(pctx->dst, 2);
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sg_set_buf(pctx->dst, authtag, 16);
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scatterwalk_sg_chain(pctx->dst, 2, req->dst);
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dst = pctx->dst;
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}
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ablkcipher_request_set_tfm(abreq, ctx->ctr);
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ablkcipher_request_set_callback(abreq, pctx->flags,
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crypto_ccm_decrypt_done, req);
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ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv);
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err = crypto_ablkcipher_decrypt(abreq);
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if (err)
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return err;
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err = crypto_ccm_auth(req, req->dst, cryptlen);
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if (err)
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return err;
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/* verify */
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if (memcmp(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_tfm *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct ccm_instance_ctx *ictx = crypto_instance_ctx(inst);
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struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_cipher *cipher;
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struct crypto_ablkcipher *ctr;
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unsigned long align;
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int err;
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cipher = crypto_spawn_cipher(&ictx->cipher);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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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_cipher;
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ctx->cipher = cipher;
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ctx->ctr = ctr;
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align = crypto_tfm_alg_alignmask(tfm);
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align &= ~(crypto_tfm_ctx_alignment() - 1);
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tfm->crt_aead.reqsize = align +
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sizeof(struct crypto_ccm_req_priv_ctx) +
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crypto_ablkcipher_reqsize(ctr);
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return 0;
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err_free_cipher:
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crypto_free_cipher(cipher);
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return err;
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}
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static void crypto_ccm_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_cipher(ctx->cipher);
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crypto_free_ablkcipher(ctx->ctr);
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}
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static struct crypto_instance *crypto_ccm_alloc_common(struct rtattr **tb,
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const char *full_name,
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const char *ctr_name,
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const char *cipher_name)
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{
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struct crypto_attr_type *algt;
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struct crypto_instance *inst;
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struct crypto_alg *ctr;
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struct crypto_alg *cipher;
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struct ccm_instance_ctx *ictx;
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int err;
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algt = crypto_get_attr_type(tb);
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err = PTR_ERR(algt);
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if (IS_ERR(algt))
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return ERR_PTR(err);
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if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
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return ERR_PTR(-EINVAL);
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cipher = crypto_alg_mod_lookup(cipher_name, CRYPTO_ALG_TYPE_CIPHER,
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CRYPTO_ALG_TYPE_MASK);
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err = PTR_ERR(cipher);
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if (IS_ERR(cipher))
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return ERR_PTR(err);
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err = -EINVAL;
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if (cipher->cra_blocksize != 16)
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goto out_put_cipher;
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inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
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err = -ENOMEM;
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if (!inst)
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goto out_put_cipher;
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|
|
|
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");
|