Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4a49b499dfa0c9e42be6d6fdd771f3434c776278
Commit:     4a49b499dfa0c9e42be6d6fdd771f3434c776278
Parent:     d29ce988aeb459203c74f14747f4f77e1829ef78
Author:     Joy Latten <[EMAIL PROTECTED]>
AuthorDate: Wed Dec 12 20:25:13 2007 +0800
Committer:  Herbert Xu <[EMAIL PROTECTED]>
CommitDate: Fri Jan 11 08:16:53 2008 +1100

    [CRYPTO] ccm: Added CCM mode
    
    This patch adds Counter with CBC-MAC (CCM) support.
    RFC 3610 and NIST Special Publication 800-38C were referenced.
    
    Signed-off-by: Joy Latten <[EMAIL PROTECTED]>
    Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
---
 crypto/Kconfig  |    7 +
 crypto/Makefile |    1 +
 crypto/ccm.c    |  889 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 897 insertions(+), 0 deletions(-)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 7ad9711..0d89f77 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -220,6 +220,13 @@ config CRYPTO_GCM
          Support for Galois/Counter Mode (GCM) and Galois Message
          Authentication Code (GMAC). Required for IPSec.
 
+config CRYPTO_CCM
+       tristate "CCM support"
+       select CRYPTO_CTR
+       select CRYPTO_AEAD
+       help
+         Support for Counter with CBC MAC. Required for IPsec.
+
 config CRYPTO_CRYPTD
        tristate "Software async crypto daemon"
        select CRYPTO_BLKCIPHER
diff --git a/crypto/Makefile b/crypto/Makefile
index 1b99b3a..48c7583 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_CRYPTO_LRW) += lrw.o
 obj-$(CONFIG_CRYPTO_XTS) += xts.o
 obj-$(CONFIG_CRYPTO_CTR) += ctr.o
 obj-$(CONFIG_CRYPTO_GCM) += gcm.o
+obj-$(CONFIG_CRYPTO_CCM) += ccm.o
 obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o
 obj-$(CONFIG_CRYPTO_DES) += des_generic.o
 obj-$(CONFIG_CRYPTO_FCRYPT) += fcrypt.o
diff --git a/crypto/ccm.c b/crypto/ccm.c
new file mode 100644
index 0000000..7cf7e5a
--- /dev/null
+++ b/crypto/ccm.c
@@ -0,0 +1,889 @@
+/*
+ * CCM: Counter with CBC-MAC
+ *
+ * (C) Copyright IBM Corp. 2007 - Joy Latten <[EMAIL PROTECTED]>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "internal.h"
+
+struct ccm_instance_ctx {
+       struct crypto_skcipher_spawn ctr;
+       struct crypto_spawn cipher;
+};
+
+struct crypto_ccm_ctx {
+       struct crypto_cipher *cipher;
+       struct crypto_ablkcipher *ctr;
+};
+
+struct crypto_rfc4309_ctx {
+       struct crypto_aead *child;
+       u8 nonce[3];
+};
+
+struct crypto_ccm_req_priv_ctx {
+       u8 odata[16];
+       u8 idata[16];
+       u8 auth_tag[16];
+       u32 ilen;
+       u32 flags;
+       struct scatterlist src[2];
+       struct scatterlist dst[2];
+       struct ablkcipher_request abreq;
+};
+
+static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx(
+       struct aead_request *req)
+{
+       unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
+
+       return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
+}
+
+static int set_msg_len(u8 *block, unsigned int msglen, int csize)
+{
+       __be32 data;
+
+       memset(block, 0, csize);
+       block += csize;
+
+       if (csize >= 4)
+               csize = 4;
+       else if (msglen > (1 << (8 * csize)))
+               return -EOVERFLOW;
+
+       data = cpu_to_be32(msglen);
+       memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
+
+       return 0;
+}
+
+static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
+                            unsigned int keylen)
+{
+       struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
+       struct crypto_ablkcipher *ctr = ctx->ctr;
+       struct crypto_cipher *tfm = ctx->cipher;
+       int err = 0;
+
+       crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
+       crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
+                                   CRYPTO_TFM_REQ_MASK);
+       err = crypto_ablkcipher_setkey(ctr, key, keylen);
+       crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
+                             CRYPTO_TFM_RES_MASK);
+       if (err)
+               goto out;
+
+       crypto_cipher_clear_flags(tfm, CRYPTO_TFM_REQ_MASK);
+       crypto_cipher_set_flags(tfm, crypto_aead_get_flags(aead) &
+                                   CRYPTO_TFM_REQ_MASK);
+       err = crypto_cipher_setkey(tfm, key, keylen);
+       crypto_aead_set_flags(aead, crypto_cipher_get_flags(tfm) &
+                             CRYPTO_TFM_RES_MASK);
+
+out:
+       return err;
+}
+
+static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
+                                 unsigned int authsize)
+{
+       switch (authsize) {
+       case 4:
+       case 6:
+       case 8:
+       case 10:
+       case 12:
+       case 14:
+       case 16:
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+static int format_input(u8 *info, struct aead_request *req,
+                       unsigned int cryptlen)
+{
+       struct crypto_aead *aead = crypto_aead_reqtfm(req);
+       unsigned int lp = req->iv[0];
+       unsigned int l = lp + 1;
+       unsigned int m;
+
+       m = crypto_aead_authsize(aead);
+
+       memcpy(info, req->iv, 16);
+
+       /* format control info per RFC 3610 and
+        * NIST Special Publication 800-38C
+        */
+       *info |= (8 * ((m - 2) / 2));
+       if (req->assoclen)
+               *info |= 64;
+
+       return set_msg_len(info + 16 - l, cryptlen, l);
+}
+
+static int format_adata(u8 *adata, unsigned int a)
+{
+       int len = 0;
+
+       /* add control info for associated data
+        * RFC 3610 and NIST Special Publication 800-38C
+        */
+       if (a < 65280) {
+               *(__be16 *)adata = cpu_to_be16(a);
+               len = 2;
+       } else  {
+               *(__be16 *)adata = cpu_to_be16(0xfffe);
+               *(__be32 *)&adata[2] = cpu_to_be32(a);
+               len = 6;
+       }
+
+       return len;
+}
+
+static void compute_mac(struct crypto_cipher *tfm, u8 *data, int n,
+                      struct crypto_ccm_req_priv_ctx *pctx)
+{
+       unsigned int bs = 16;
+       u8 *odata = pctx->odata;
+       u8 *idata = pctx->idata;
+       int datalen, getlen;
+
+       datalen = n;
+
+       /* first time in here, block may be partially filled. */
+       getlen = bs - pctx->ilen;
+       if (datalen >= getlen) {
+               memcpy(idata + pctx->ilen, data, getlen);
+               crypto_xor(odata, idata, bs);
+               crypto_cipher_encrypt_one(tfm, odata, odata);
+               datalen -= getlen;
+               data += getlen;
+               pctx->ilen = 0;
+       }
+
+       /* now encrypt rest of data */
+       while (datalen >= bs) {
+               crypto_xor(odata, data, bs);
+               crypto_cipher_encrypt_one(tfm, odata, odata);
+
+               datalen -= bs;
+               data += bs;
+       }
+
+       /* check and see if there's leftover data that wasn't
+        * enough to fill a block.
+        */
+       if (datalen) {
+               memcpy(idata + pctx->ilen, data, datalen);
+               pctx->ilen += datalen;
+       }
+}
+
+static void get_data_to_compute(struct crypto_cipher *tfm,
+                              struct crypto_ccm_req_priv_ctx *pctx,
+                              struct scatterlist *sg, unsigned int len)
+{
+       struct scatter_walk walk;
+       u8 *data_src;
+       int n;
+
+       scatterwalk_start(&walk, sg);
+
+       while (len) {
+               n = scatterwalk_clamp(&walk, len);
+               if (!n) {
+                       scatterwalk_start(&walk, sg_next(walk.sg));
+                       n = scatterwalk_clamp(&walk, len);
+               }
+               data_src = scatterwalk_map(&walk, 0);
+
+               compute_mac(tfm, data_src, n, pctx);
+               len -= n;
+
+               scatterwalk_unmap(data_src, 0);
+               scatterwalk_advance(&walk, n);
+               scatterwalk_done(&walk, 0, len);
+               if (len)
+                       crypto_yield(pctx->flags);
+       }
+
+       /* any leftover needs padding and then encrypted */
+       if (pctx->ilen) {
+               int padlen;
+               u8 *odata = pctx->odata;
+               u8 *idata = pctx->idata;
+
+               padlen = 16 - pctx->ilen;
+               memset(idata + pctx->ilen, 0, padlen);
+               crypto_xor(odata, idata, 16);
+               crypto_cipher_encrypt_one(tfm, odata, odata);
+               pctx->ilen = 0;
+       }
+}
+
+static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
+                          unsigned int cryptlen)
+{
+       struct crypto_aead *aead = crypto_aead_reqtfm(req);
+       struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
+       struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+       struct crypto_cipher *cipher = ctx->cipher;
+       unsigned int assoclen = req->assoclen;
+       u8 *odata = pctx->odata;
+       u8 *idata = pctx->idata;
+       int err;
+
+       /* format control data for input */
+       err = format_input(odata, req, cryptlen);
+       if (err)
+               goto out;
+
+       /* encrypt first block to use as start in computing mac  */
+       crypto_cipher_encrypt_one(cipher, odata, odata);
+
+       /* format associated data and compute into mac */
+       if (assoclen) {
+               pctx->ilen = format_adata(idata, assoclen);
+               get_data_to_compute(cipher, pctx, req->assoc, req->assoclen);
+       }
+
+       /* compute plaintext into mac */
+       get_data_to_compute(cipher, pctx, plain, cryptlen);
+
+out:
+       return err;
+}
+
+static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
+{
+       struct aead_request *req = areq->data;
+       struct crypto_aead *aead = crypto_aead_reqtfm(req);
+       struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+       u8 *odata = pctx->odata;
+
+       if (!err)
+               scatterwalk_map_and_copy(odata, req->dst, req->cryptlen,
+                                        crypto_aead_authsize(aead), 1);
+       aead_request_complete(req, err);
+}
+
+static inline int crypto_ccm_check_iv(const u8 *iv)
+{
+       /* 2 <= L <= 8, so 1 <= L' <= 7. */
+       if (1 > iv[0] || iv[0] > 7)
+               return -EINVAL;
+
+       return 0;
+}
+
+static int crypto_ccm_encrypt(struct aead_request *req)
+{
+       struct crypto_aead *aead = crypto_aead_reqtfm(req);
+       struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
+       struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+       struct ablkcipher_request *abreq = &pctx->abreq;
+       struct scatterlist *dst;
+       unsigned int cryptlen = req->cryptlen;
+       u8 *odata = pctx->odata;
+       u8 *iv = req->iv;
+       int err;
+
+       err = crypto_ccm_check_iv(iv);
+       if (err)
+               return err;
+
+       pctx->flags = aead_request_flags(req);
+
+       err = crypto_ccm_auth(req, req->src, cryptlen);
+       if (err)
+               return err;
+
+        /* Note: rfc 3610 and NIST 800-38C require counter of
+        * zero to encrypt auth tag.
+        */
+       memset(iv + 15 - iv[0], 0, iv[0] + 1);
+
+       sg_init_table(pctx->src, 2);
+       sg_set_buf(pctx->src, odata, 16);
+       scatterwalk_sg_chain(pctx->src, 2, req->src);
+
+       dst = pctx->src;
+       if (req->src != req->dst) {
+               sg_init_table(pctx->dst, 2);
+               sg_set_buf(pctx->dst, odata, 16);
+               scatterwalk_sg_chain(pctx->dst, 2, req->dst);
+               dst = pctx->dst;
+       }
+
+       ablkcipher_request_set_tfm(abreq, ctx->ctr);
+       ablkcipher_request_set_callback(abreq, pctx->flags,
+                                       crypto_ccm_encrypt_done, req);
+       ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv);
+       err = crypto_ablkcipher_encrypt(abreq);
+       if (err)
+               return err;
+
+       /* copy authtag to end of dst */
+       scatterwalk_map_and_copy(odata, req->dst, cryptlen,
+                                crypto_aead_authsize(aead), 1);
+       return err;
+}
+
+static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
+                                  int err)
+{
+       struct aead_request *req = areq->data;
+       struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+       struct crypto_aead *aead = crypto_aead_reqtfm(req);
+       unsigned int authsize = crypto_aead_authsize(aead);
+       unsigned int cryptlen = req->cryptlen - authsize;
+
+       if (!err) {
+               err = crypto_ccm_auth(req, req->dst, cryptlen);
+               if (!err && memcmp(pctx->auth_tag, pctx->odata, authsize))
+                       err = -EBADMSG;
+       }
+       aead_request_complete(req, err);
+}
+
+static int crypto_ccm_decrypt(struct aead_request *req)
+{
+       struct crypto_aead *aead = crypto_aead_reqtfm(req);
+       struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
+       struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+       struct ablkcipher_request *abreq = &pctx->abreq;
+       struct scatterlist *dst;
+       unsigned int authsize = crypto_aead_authsize(aead);
+       unsigned int cryptlen = req->cryptlen;
+       u8 *authtag = pctx->auth_tag;
+       u8 *odata = pctx->odata;
+       u8 *iv = req->iv;
+       int err;
+
+       if (cryptlen < authsize)
+               return -EINVAL;
+       cryptlen -= authsize;
+
+       err = crypto_ccm_check_iv(iv);
+       if (err)
+               return err;
+
+       pctx->flags = aead_request_flags(req);
+
+       scatterwalk_map_and_copy(authtag, req->src, cryptlen, authsize, 0);
+
+       memset(iv + 15 - iv[0], 0, iv[0] + 1);
+
+       sg_init_table(pctx->src, 2);
+       sg_set_buf(pctx->src, authtag, 16);
+       scatterwalk_sg_chain(pctx->src, 2, req->src);
+
+       dst = pctx->src;
+       if (req->src != req->dst) {
+               sg_init_table(pctx->dst, 2);
+               sg_set_buf(pctx->dst, authtag, 16);
+               scatterwalk_sg_chain(pctx->dst, 2, req->dst);
+               dst = pctx->dst;
+       }
+
+       ablkcipher_request_set_tfm(abreq, ctx->ctr);
+       ablkcipher_request_set_callback(abreq, pctx->flags,
+                                       crypto_ccm_decrypt_done, req);
+       ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv);
+       err = crypto_ablkcipher_decrypt(abreq);
+       if (err)
+               return err;
+
+       err = crypto_ccm_auth(req, req->dst, cryptlen);
+       if (err)
+               return err;
+
+       /* verify */
+       if (memcmp(authtag, odata, authsize))
+               return -EBADMSG;
+
+       return err;
+}
+
+static int crypto_ccm_init_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_instance *inst = (void *)tfm->__crt_alg;
+       struct ccm_instance_ctx *ictx = crypto_instance_ctx(inst);
+       struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm);
+       struct crypto_cipher *cipher;
+       struct crypto_ablkcipher *ctr;
+       unsigned long align;
+       int err;
+
+       cipher = crypto_spawn_cipher(&ictx->cipher);
+       if (IS_ERR(cipher))
+               return PTR_ERR(cipher);
+
+       ctr = crypto_spawn_skcipher(&ictx->ctr);
+       err = PTR_ERR(ctr);
+       if (IS_ERR(ctr))
+               goto err_free_cipher;
+
+       ctx->cipher = cipher;
+       ctx->ctr = ctr;
+
+       align = crypto_tfm_alg_alignmask(tfm);
+       align &= ~(crypto_tfm_ctx_alignment() - 1);
+       tfm->crt_aead.reqsize = align +
+                               sizeof(struct crypto_ccm_req_priv_ctx) +
+                               crypto_ablkcipher_reqsize(ctr);
+
+       return 0;
+
+err_free_cipher:
+       crypto_free_cipher(cipher);
+       return err;
+}
+
+static void crypto_ccm_exit_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm);
+
+       crypto_free_cipher(ctx->cipher);
+       crypto_free_ablkcipher(ctx->ctr);
+}
+
+static struct crypto_instance *crypto_ccm_alloc_common(struct rtattr **tb,
+                                                      const char *full_name,
+                                                      const char *ctr_name,
+                                                      const char *cipher_name)
+{
+       struct crypto_attr_type *algt;
+       struct crypto_instance *inst;
+       struct crypto_alg *ctr;
+       struct crypto_alg *cipher;
+       struct ccm_instance_ctx *ictx;
+       int err;
+
+       algt = crypto_get_attr_type(tb);
+       err = PTR_ERR(algt);
+       if (IS_ERR(algt))
+               return ERR_PTR(err);
+
+       if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
+               return ERR_PTR(-EINVAL);
+
+       cipher = crypto_alg_mod_lookup(cipher_name,  CRYPTO_ALG_TYPE_CIPHER,
+                                      CRYPTO_ALG_TYPE_MASK);
+       err = PTR_ERR(cipher);
+       if (IS_ERR(cipher))
+               return ERR_PTR(err);
+
+       err = -EINVAL;
+       if (cipher->cra_blocksize != 16)
+               goto out_put_cipher;
+
+       inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
+       err = -ENOMEM;
+       if (!inst)
+               goto out_put_cipher;
+
+       ictx = crypto_instance_ctx(inst);
+
+       err = crypto_init_spawn(&ictx->cipher, cipher, inst,
+                               CRYPTO_ALG_TYPE_MASK);
+       if (err)
+               goto err_free_inst;
+
+       crypto_set_skcipher_spawn(&ictx->ctr, inst);
+       err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
+                                  crypto_requires_sync(algt->type,
+                                                       algt->mask));
+       if (err)
+               goto err_drop_cipher;
+
+       ctr = crypto_skcipher_spawn_alg(&ictx->ctr);
+
+       /* Not a stream cipher? */
+       err = -EINVAL;
+       if (ctr->cra_blocksize != 1)
+               goto err_drop_ctr;
+
+       /* We want the real thing! */
+       if (ctr->cra_ablkcipher.ivsize != 16)
+               goto err_drop_ctr;
+
+       err = -ENAMETOOLONG;
+       if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+                    "ccm_base(%s,%s)", ctr->cra_driver_name,
+                    cipher->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+               goto err_drop_ctr;
+
+       memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
+
+       inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
+       inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
+       inst->alg.cra_priority = cipher->cra_priority + ctr->cra_priority;
+       inst->alg.cra_blocksize = 1;
+       inst->alg.cra_alignmask = cipher->cra_alignmask | ctr->cra_alignmask |
+                                 (__alignof__(u32) - 1);
+       inst->alg.cra_type = &crypto_aead_type;
+       inst->alg.cra_aead.ivsize = 16;
+       inst->alg.cra_aead.maxauthsize = 16;
+       inst->alg.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
+       inst->alg.cra_init = crypto_ccm_init_tfm;
+       inst->alg.cra_exit = crypto_ccm_exit_tfm;
+       inst->alg.cra_aead.setkey = crypto_ccm_setkey;
+       inst->alg.cra_aead.setauthsize = crypto_ccm_setauthsize;
+       inst->alg.cra_aead.encrypt = crypto_ccm_encrypt;
+       inst->alg.cra_aead.decrypt = crypto_ccm_decrypt;
+
+out:
+       crypto_mod_put(cipher);
+       return inst;
+
+err_drop_ctr:
+       crypto_drop_skcipher(&ictx->ctr);
+err_drop_cipher:
+       crypto_drop_spawn(&ictx->cipher);
+err_free_inst:
+       kfree(inst);
+out_put_cipher:
+       inst = ERR_PTR(err);
+       goto out;
+}
+
+static struct crypto_instance *crypto_ccm_alloc(struct rtattr **tb)
+{
+       int err;
+       const char *cipher_name;
+       char ctr_name[CRYPTO_MAX_ALG_NAME];
+       char full_name[CRYPTO_MAX_ALG_NAME];
+
+       cipher_name = crypto_attr_alg_name(tb[1]);
+       err = PTR_ERR(cipher_name);
+       if (IS_ERR(cipher_name))
+               return ERR_PTR(err);
+
+       if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
+                    cipher_name) >= CRYPTO_MAX_ALG_NAME)
+               return ERR_PTR(-ENAMETOOLONG);
+
+       if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >=
+           CRYPTO_MAX_ALG_NAME)
+               return ERR_PTR(-ENAMETOOLONG);
+
+       return crypto_ccm_alloc_common(tb, full_name, ctr_name, cipher_name);
+}
+
+static void crypto_ccm_free(struct crypto_instance *inst)
+{
+       struct ccm_instance_ctx *ctx = crypto_instance_ctx(inst);
+
+       crypto_drop_spawn(&ctx->cipher);
+       crypto_drop_skcipher(&ctx->ctr);
+       kfree(inst);
+}
+
+static struct crypto_template crypto_ccm_tmpl = {
+       .name = "ccm",
+       .alloc = crypto_ccm_alloc,
+       .free = crypto_ccm_free,
+       .module = THIS_MODULE,
+};
+
+static struct crypto_instance *crypto_ccm_base_alloc(struct rtattr **tb)
+{
+       int err;
+       const char *ctr_name;
+       const char *cipher_name;
+       char full_name[CRYPTO_MAX_ALG_NAME];
+
+       ctr_name = crypto_attr_alg_name(tb[1]);
+       err = PTR_ERR(ctr_name);
+       if (IS_ERR(ctr_name))
+               return ERR_PTR(err);
+
+       cipher_name = crypto_attr_alg_name(tb[2]);
+       err = PTR_ERR(cipher_name);
+       if (IS_ERR(cipher_name))
+               return ERR_PTR(err);
+
+       if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)",
+                    ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME)
+               return ERR_PTR(-ENAMETOOLONG);
+
+       return crypto_ccm_alloc_common(tb, full_name, ctr_name, cipher_name);
+}
+
+static struct crypto_template crypto_ccm_base_tmpl = {
+       .name = "ccm_base",
+       .alloc = crypto_ccm_base_alloc,
+       .free = crypto_ccm_free,
+       .module = THIS_MODULE,
+};
+
+static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
+                                unsigned int keylen)
+{
+       struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
+       struct crypto_aead *child = ctx->child;
+       int err;
+
+       if (keylen < 3)
+               return -EINVAL;
+
+       keylen -= 3;
+       memcpy(ctx->nonce, key + keylen, 3);
+
+       crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+       crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
+                                    CRYPTO_TFM_REQ_MASK);
+       err = crypto_aead_setkey(child, key, keylen);
+       crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
+                                     CRYPTO_TFM_RES_MASK);
+
+       return err;
+}
+
+static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
+                                     unsigned int authsize)
+{
+       struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
+
+       switch (authsize) {
+       case 8:
+       case 12:
+       case 16:
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return crypto_aead_setauthsize(ctx->child, authsize);
+}
+
+static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
+{
+       struct aead_request *subreq = aead_request_ctx(req);
+       struct crypto_aead *aead = crypto_aead_reqtfm(req);
+       struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
+       struct crypto_aead *child = ctx->child;
+       u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
+                          crypto_aead_alignmask(child) + 1);
+
+       /* L' */
+       iv[0] = 3;
+
+       memcpy(iv + 1, ctx->nonce, 3);
+       memcpy(iv + 4, req->iv, 8);
+
+       aead_request_set_tfm(subreq, child);
+       aead_request_set_callback(subreq, req->base.flags, req->base.complete,
+                                 req->base.data);
+       aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
+       aead_request_set_assoc(subreq, req->assoc, req->assoclen);
+
+       return subreq;
+}
+
+static int crypto_rfc4309_encrypt(struct aead_request *req)
+{
+       req = crypto_rfc4309_crypt(req);
+
+       return crypto_aead_encrypt(req);
+}
+
+static int crypto_rfc4309_decrypt(struct aead_request *req)
+{
+       req = crypto_rfc4309_crypt(req);
+
+       return crypto_aead_decrypt(req);
+}
+
+static int crypto_rfc4309_init_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_instance *inst = (void *)tfm->__crt_alg;
+       struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
+       struct crypto_rfc4309_ctx *ctx = crypto_tfm_ctx(tfm);
+       struct crypto_aead *aead;
+       unsigned long align;
+
+       aead = crypto_spawn_aead(spawn);
+       if (IS_ERR(aead))
+               return PTR_ERR(aead);
+
+       ctx->child = aead;
+
+       align = crypto_aead_alignmask(aead);
+       align &= ~(crypto_tfm_ctx_alignment() - 1);
+       tfm->crt_aead.reqsize = sizeof(struct aead_request) +
+                               ALIGN(crypto_aead_reqsize(aead),
+                                     crypto_tfm_ctx_alignment()) +
+                               align + 16;
+
+       return 0;
+}
+
+static void crypto_rfc4309_exit_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_rfc4309_ctx *ctx = crypto_tfm_ctx(tfm);
+
+       crypto_free_aead(ctx->child);
+}
+
+static struct crypto_instance *crypto_rfc4309_alloc(struct rtattr **tb)
+{
+       struct crypto_attr_type *algt;
+       struct crypto_instance *inst;
+       struct crypto_aead_spawn *spawn;
+       struct crypto_alg *alg;
+       const char *ccm_name;
+       int err;
+
+       algt = crypto_get_attr_type(tb);
+       err = PTR_ERR(algt);
+       if (IS_ERR(algt))
+               return ERR_PTR(err);
+
+       if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
+               return ERR_PTR(-EINVAL);
+
+       ccm_name = crypto_attr_alg_name(tb[1]);
+       err = PTR_ERR(ccm_name);
+       if (IS_ERR(ccm_name))
+               return ERR_PTR(err);
+
+       inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+       if (!inst)
+               return ERR_PTR(-ENOMEM);
+
+       spawn = crypto_instance_ctx(inst);
+       crypto_set_aead_spawn(spawn, inst);
+       err = crypto_grab_aead(spawn, ccm_name, 0,
+                              crypto_requires_sync(algt->type, algt->mask));
+       if (err)
+               goto out_free_inst;
+
+       alg = crypto_aead_spawn_alg(spawn);
+
+       err = -EINVAL;
+
+       /* We only support 16-byte blocks. */
+       if (alg->cra_aead.ivsize != 16)
+               goto out_drop_alg;
+
+       /* Not a stream cipher? */
+       if (alg->cra_blocksize != 1)
+               goto out_drop_alg;
+
+       err = -ENAMETOOLONG;
+       if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
+                    "rfc4309(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
+           snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+                    "rfc4309(%s)", alg->cra_driver_name) >=
+           CRYPTO_MAX_ALG_NAME)
+               goto out_drop_alg;
+
+       inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
+       inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
+       inst->alg.cra_priority = alg->cra_priority;
+       inst->alg.cra_blocksize = 1;
+       inst->alg.cra_alignmask = alg->cra_alignmask;
+       inst->alg.cra_type = &crypto_nivaead_type;
+
+       inst->alg.cra_aead.ivsize = 8;
+       inst->alg.cra_aead.maxauthsize = 16;
+
+       inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
+
+       inst->alg.cra_init = crypto_rfc4309_init_tfm;
+       inst->alg.cra_exit = crypto_rfc4309_exit_tfm;
+
+       inst->alg.cra_aead.setkey = crypto_rfc4309_setkey;
+       inst->alg.cra_aead.setauthsize = crypto_rfc4309_setauthsize;
+       inst->alg.cra_aead.encrypt = crypto_rfc4309_encrypt;
+       inst->alg.cra_aead.decrypt = crypto_rfc4309_decrypt;
+
+       inst->alg.cra_aead.geniv = "seqiv";
+
+out:
+       return inst;
+
+out_drop_alg:
+       crypto_drop_aead(spawn);
+out_free_inst:
+       kfree(inst);
+       inst = ERR_PTR(err);
+       goto out;
+}
+
+static void crypto_rfc4309_free(struct crypto_instance *inst)
+{
+       crypto_drop_spawn(crypto_instance_ctx(inst));
+       kfree(inst);
+}
+
+static struct crypto_template crypto_rfc4309_tmpl = {
+       .name = "rfc4309",
+       .alloc = crypto_rfc4309_alloc,
+       .free = crypto_rfc4309_free,
+       .module = THIS_MODULE,
+};
+
+static int __init crypto_ccm_module_init(void)
+{
+       int err;
+
+       err = crypto_register_template(&crypto_ccm_base_tmpl);
+       if (err)
+               goto out;
+
+       err = crypto_register_template(&crypto_ccm_tmpl);
+       if (err)
+               goto out_undo_base;
+
+       err = crypto_register_template(&crypto_rfc4309_tmpl);
+       if (err)
+               goto out_undo_ccm;
+
+out:
+       return err;
+
+out_undo_ccm:
+       crypto_unregister_template(&crypto_ccm_tmpl);
+out_undo_base:
+       crypto_unregister_template(&crypto_ccm_base_tmpl);
+       goto out;
+}
+
+static void __exit crypto_ccm_module_exit(void)
+{
+       crypto_unregister_template(&crypto_rfc4309_tmpl);
+       crypto_unregister_template(&crypto_ccm_tmpl);
+       crypto_unregister_template(&crypto_ccm_base_tmpl);
+}
+
+module_init(crypto_ccm_module_init);
+module_exit(crypto_ccm_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Counter with CBC MAC");
+MODULE_ALIAS("ccm_base");
+MODULE_ALIAS("rfc4309");
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